TY - CONF A1 - Neuschaefer-Rube, U. A1 - Bartscher, M. A1 - Neugebauer, M. A1 - Härtig, F. A1 - Goebbels, Jürgen A1 - Ehrig, Karsten A1 - Staude, Andreas T1 - Measurement of micro gears - comparison of optical, tactile-optical and CT-measurements N2 - Micro gears are applied in an increasing quantity in many applications. Therefore, precise measurements are of growing importance to ensure their quality. This contribution describes the measurement of gears of a micro planetary gear set with a tactile probe, a tactile-optical probe, an optical sensor, and computed tomography (CT). For the tactile measurements, a high precision piezoresistive microprobe was used. A so-called fiber probe was applied for tactile-optical measurements. This probe applies image processing to determine the position of the tactile probing element. For all tactile and tactile-optical measurements, single point probing was used. The optical measurements were carried out with an imaging sensor based on focus variation. Due to limited accessibility, on some gears not all regions could be measured by the optical sensor and the tactile-optical probe. In contrast to this, with CT the whole part could be measured with high point density. We used a micro-CT system and carried out measurements with Synchrotron-CT. All the sensors used deliver measurement data in Cartesian coordinates. It is a challenge to transfer these data into coordinates in which gear parameters are defined. For this, special attention must be paid to the determination of the gear axis and to the orientation of the teeth. The applied procedures are detailed for different micro gears. The comparison between data of different measurements was carried out successfully. The deviations between the CT data and the tactile or tactile-optical data lie in the range of only a few micrometers. KW - Micro gears KW - Coordinate metrology KW - Computed tomography KW - Optical sensors KW - Tactile probes PY - 2011 U6 - https://doi.org/10.1117/12.872413 SN - 0277-786X SN - 0038-7355 SN - 0361-0748 N1 - Serientitel: Proceedings series – Series title: Proceedings series IS - 7864 SP - 78640H-1 EP - 78640H-9 PB - VDE-Verl. CY - Berlin ; Offenbach AN - OPUS4-25998 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Staude, Andreas A1 - Riesemeier, Heinrich A1 - Reiche, I. A1 - Zizak, I. A1 - Fratzl, P. T1 - Evidencing the hierachical structure of archaeological ivory at micro and nanoscale and its evolution over time by means of combined µ-SAXS/WAXS, µPIXE and µ-CT T2 - Gordon Research Conference: Scientific Methods in Cultural Heritage CY - Mount Snow Resort, West Dover, VT, USA DA - 2012-07-29 PY - 2012 AN - OPUS4-27877 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Godehardt, M. A1 - Krebs, Holger A1 - Ohser, J. A1 - Staude, Andreas T1 - Analyse der Porengrößenverteilung in einer myCT-Aufnahme eines Sprengstoffes PY - 2012 SN - 0941-4584 VL - 34 IS - 1 SP - 3 EP - 4 PB - Deutscher Sprengverband CY - Siegen AN - OPUS4-27976 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Kamenz, C. A1 - Staude, Andreas A1 - Dunlop, J.A. T1 - Sperm carriers in silurian sea scorpions N2 - Invasion of the land by arachnids required adaptations of numerous organs, such as gills evolving into lungs, as well as mechanisms facilitating sperm transfer in a terrestrial environment. Many modern arachnids use spermatophores for this purpose, i.e. sperm transmitters detached from the body. Exceptionally preserved Silurian (423 Ma) fossils of Eurypterus tetragonophthalmus Fischer, 1839 (Chelicerata: Eurypterida) preserve so-called ‘horn organs’ which we here demonstrate as being equivalent to the spermatophore-producing parts of the genital tract in certain modern arachnids. This clarifies a long-running debate about sexing eurypterids based on the shape of the median abdominal (or genital) appendage. To our knowledge this is also the oldest direct evidence for spermatophoremediated sperm transfer in the fossil record and suggests that eurypterids had evolved mating techniques using spermatophores as early as the Silurian, a valuable prerequisite for life on land. Spermatophores are absent in sea spiders (Pycnogonida) and horseshoe crabs (Xiphosura); thus the shared presence of sclerotized sperm-transfer devices in eurypterids and arachnids is a novel character, newly elucidated here,which offers explicit support for (Eurypterida + Arachnida). For this clade the name Sclerophorata n. nov. is proposed. Arachnida can be further defined by fusion of the originally paired genital opening. KW - Fossil KW - Silurian KW - Eurypterida KW - Arachnida KW - Spermatophore KW - Evolution PY - 2011 U6 - https://doi.org/10.1007/s00114-011-0841-9 SN - 0933-4793 VL - 98 IS - 10 SP - 889 EP - 896 PB - Schäuble CY - Rheinfelden AN - OPUS4-24552 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bartscher, M. A1 - Ehrig, Karsten A1 - Staude, Andreas A1 - Goebbels, Jürgen A1 - Neuschaefer-Rube, U. T1 - Application of an industrial CT reference standard for cast freeform shaped workpieces N2 - Industrial computed tomography (CT) today is an important method to analyze defects and to measure the geometry of technical products. The measurement capability of industrial CT often depends on the knowledge of the measurement errors being present. Only with this knowledge, effective corrections are possible by manufacturers, or adapted measurement procedures become possible for the customers. Thus, there is the strong need to have adequate reference standards both for the assessment of general dependencies and for the measurement of task-specific effects. Especially the latter are difficult to assess. This paper shows the application of a versatile dismountable workpiece-near reference body for the use with CT. The reference standard was made from a miniaturized cast aluminium (one-)cylinder head. It can be dismounted into four segments, each featuring reference geometries which enable a registration of CT measured and other reference datasets (e.g. from tactile CMM). The reference standard embodies complex freeform surfaces which are a challenging measurement task for CT and other sensors. Here the application of the reference standard is the study of the influence of material mixes. This is realized by adding pieces of other materials which disturb the mono-material measurement. Results of the application of the reference standard are presented using data from industrial micro-CT systems and CMM reference data. A special emphasis is given on the workflow of the data processing and the data analysis. T2 - International symposium on digital industrial radiology and computed tomography CY - Berlin, Germany DA - 20.06.2011 KW - Industrial reference standard KW - Computed tomographie KW - Freeform shaped workpieces PY - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-245532 SN - 978-3-940283-34-4 IS - DGZfP-BB 128 (We.4.3) SP - 1 EP - 12 PB - Deutsche Gesellschaft für zerstörungsfreie Prüfung e.V. (DGZfP) AN - OPUS4-24553 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Staude, Andreas A1 - Goebbels, Jürgen T1 - Determining the spatial resolution in computed tomography - comparison of MTF and line-pair structures N2 - According to the relevant standards, measurements of suitable test pieces are analysed with the two established methods to determine the spatial resolution of CT data (MTF and contrast of line-pairs). The results are compared and differences are discussed. T2 - International symposium on digital industrial radiology and computed tomography CY - Berlin, Germany DA - 20.06.2011 PY - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-245544 SN - 978-3-940283-34-4 IS - DGZfP-BB 128 (Tu.4.1) SP - 1 EP - 9 PB - Deutsche Gesellschaft für zerstörungsfreie Prüfung e.V. (DGZfP) AN - OPUS4-24554 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Reiche, I. A1 - Müller, K. A1 - Staude, Andreas A1 - Goebbels, Jürgen A1 - Riesemeier, Heinrich T1 - Synchrotron radiation and laboratory micro X-ray computed tomography - useful tools for the material identification of prehistoric objects made of ivory, bone or antler N2 - Archaeological bone, ivory and antler, as well as objects manufactured from them, are largely studied to extract as much information as possible from these materials. Among others, one key question in archaeology is the exact identification of the material. Even if the identification of different kinds of osseous material seems to be trivial in many cases, it can be a difficult issue when small, heavily carved and more or less altered ancient objects are concerned. This study was focused on the determination of parameters allowing the distinction of archaeological ivory, bone and antler in order to identify the raw material used for the manufacture of prehistoric objects. The high performance of synchrotron radiation (SR) and laboratory-based micro X-ray computed tomography (microCT), providing highly resolved three-dimensional information on the micromorphology, permitted the establishment of such distinctive features of modern references of ivory, antler, land mammal and whale bones: ivory shows characteristic tubular pores with a diameter of about 1 to 2 µm, bone and antler show typical osteon structures. In our measured references, antler shows on average larger and more elongated shaped pores of the osteons compared to terrestrial mammal bone. This feature however depends very much on the original localization of the studied sample within the antler. Whale bones can be distinguished from the other osseous materials by a cancellous, osteoporotic-like structure with irregularly distributed rounded porosities with diameters reaching up to 500 µm. These characteristics have also been tested on determined Palaeolithic fragments, as diagenetic changes during burial have to be considered and may lead to the modification of the parameters established on the basis of modern bone references. In general, the chemical composition of bone objects can change drastically over time while micromorphological features, as evidenced by microCT, seem to be less susceptible to such alterations. In addition, microCT enables the comparison of inner and possibly less altered parts of the objects, and can be considered as completely non-destructive for small mineralised prehistoric objects. In this study, specific morphological features allowing the distinction of ivory and of whale bone from other bone and antler material were determined, even for altered materials dating back to Palaeolithic periods. Thus, we provide, in addition to archaeozoological, chemical and isotopic markers, a new non-destructive tool to identify some raw materials used for the fabrication of osseous objects ranging from recent to prehistoric periods. PY - 2011 U6 - https://doi.org/10.1039/c0ja00246a SN - 0267-9477 SN - 1364-5544 VL - 26 IS - 9 SP - 1802 EP - 1812 PB - Royal Society of Chemistry CY - London AN - OPUS4-24338 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Schulze, M. A1 - Staude, Andreas A1 - Neukamm, M. A1 - Neuschaefer-Rube, U. A1 - Goebbels, Jürgen A1 - Bartscher, M. A1 - Bellon, Carsten A1 - Hilpert, U. ED - Weckenmann, A. T1 - Hochgenaue Geometriebestimmung von Mikrobauteilen mit Computertomographie (CT) N2 - Ziel des Vorhabens ist die hochgenaue und vollständige Erfassung innerer und äußerer Geometrien von Mikrobauteilen mittels Mikro-Computertomographie (µCT). Industriell wichtige Mikrobauteile sind z.B. Einspritzsysteme, Festplattenkomponenten oder Instrumente für die minimal-invasive Chirurgie. Typische Bauteilgrößen liegen hier im Bereich 0,1 mm - 100mm; typische zu messende Strukturen haben Größen von 0,5 µm - 500 µm. Mit klassischen Methoden der Messtechnik ist eine schnelle und hochgenaue Erfassung der gesamten Oberfläche von Mikrobauteilen bisher kaum möglich. Innenstrukturen von Mikrobauteilen können mit keiner optischen oder taktilen Messtechnik zerstörungsfrei gemessen werden. Diese Einschränkungen sollen mittels hochgenauer µCT überwunden werden. Hierzu soll der Messprozess simuliert werden, um die Anwendung von Korrekturverfahren zur Genauigkeitssteigerung zu ermöglichen. CT-Messungen an kalibrierten Mikroprüfkörpern sollen die Korrekturverfahren verifizieren. Für die Kalibrierung der Prüfkörper sollen Multisensor-Verfahren entwickelt und getestet werden. Diese sollen es erlauben, Prüfkörper gleichzeitig hochgenau und mit großer Messpunktdichte zu kalibrieren. Es ist geplant, die an Prüfkörpern erreichten Messunsicherheiten und Auflösungen zum Projektabschluss an realen, industriellen Mikrobauteilen (z.B. Mikrozahnrädern) messtechnisch nachzuweisen. T2 - Abschlusskolloquium DFG Schwerpunktprogramm 1159 - Neue Strategien der Mess- und Prüftechnik für die Produktion von Mikrosystemen und Nanostrukturen CY - Erlangen, Deutschland DA - 06.10.2010 PY - 2011 SN - 978-3-8440-0358-1 SN - 0945-0769 SP - 36 EP - 52 PB - Shaker Verlag GmbH AN - OPUS4-24875 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Zimmermann, J. A1 - Sawodny, O. A1 - Lyda, W. A1 - Burla, A. A1 - Osten, W. A1 - Eigenbrod, H. A1 - Westkämper, E. A1 - Shaw, L. A1 - Weckenmann, A. A1 - Herffurth, T. A1 - Duparré, A. A1 - Tünnermann, A. A1 - Staude, Andreas A1 - Goebbels, Jürgen ED - Weckenmann, A. T1 - Registrierung multimodaler Messungen am Beispiel eines MEMS N2 - Die Produktion von elektronischen, optischen und elektro-mechanischen Mikro- und Nanosystemen stellt hohe Anforderungen an die Messtechnik, um die Fertigungsprozesse zu optimieren und die Qualität zu prüfen. Existierende Messverfahren unterliegen Beschränkungen hinsichtlich des Auflösungsvermögens, der Messfeldgröße und des Ergebnisses der Messung. Der kombinierte Einsatz von Sensoren mit unterschiedlichen Fähigkeiten in den Auflösungsstufen mittels einer intelligenten Messstrategie ermöglicht eine effiziente Prüfung. Neben den geeigneten Prüfstrategien werden auch Methoden zur Fusion und Auswertung der Daten von Sensoren mit unterschiedlichen Auflösungsfähigkeiten benötigt. Datenfusion bezeichnet dabei das Zusammenfügen verschiedener Messungen, um entweder unterschiedliche Eigenschaften eines Messobjekts in einem gemeinsamen Koordinatensystem angeben zu können oder um aus verschiedenen Messungen derselben Eigenschaft des Messobjekts einen Datensatz von höherer Qualität gegenüber den einzelnen Datensätzen zu erhalten. Voraussetzung für die Datenfusion ist Registrierung, die eine Überführung von Messdaten unterschiedlicher Messfelder oder Messmittel in ein gemeinsames Koordinatensystem darstellt und Thema dieses Beitrages ist. T2 - Abschlusskolloquium DFG Schwerpunktprogramm 1159 - Neue Strategien der Mess- und Prüftechnik für die Produktion von Mikrosystemen und Nanostrukturen CY - Erlangen, Deutschland DA - 06.11.2010 PY - 2011 SN - 978-3-8440-0358-1 SN - 0945-0769 SP - 173 EP - 187 PB - Shaker Verlag GmbH AN - OPUS4-24876 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Neuschaefer-Rube, U. A1 - Becke, C. A1 - Sadowski, E. A1 - Tan, Ö. A1 - Staude, Andreas A1 - Zimmermann, J. ED - Weckenmann, A. T1 - Virtuelle Messgeräte und Simulationen im Mikrobereich - Potential und Grenzen T2 - Abschlusskolloquium DFG Schwerpunktprogramm 1159 - Neue Strategien der Mess- und Prüftechnik für die Produktion von Mikrosystemen und Nanostrukturen CY - Erlangen, Deutschland DA - 2010-10-06 PY - 2011 SN - 978-3-8440-0358-1 SN - 0945-0769 SP - 206 EP - 218 PB - Shaker Verlag GmbH AN - OPUS4-24877 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Ehrig, Karsten A1 - Bartscher, M. A1 - Goebbels, Jürgen A1 - Koch, M. A1 - Staude, Andreas T1 - Einfluss von Materialkombinationen auf das dimensionelle Messen mit Mikro-Computertomographie am Beispiel eines werkstücknahen Testkörpers N2 - Die Computertomographie (CT) hat sich als dimensionelle Messmethode in der industriellen Produktion etabliert. Durch Messungen an speziellen Prüfkörpern ist es möglich, quantitative Informationen über die metrologischen Eigenschaften dimensioneller Messungen zu erhalten. In dieser Arbeit wird einen Aluminium-Guss-Prüfkörper (120 mm x 90 mm x 60 mm) benutzt, mit dem – in der vorliegender Form – auch der Einfluss von Materialien unterschiedlicher Schwächung auf dimensionelle CT-Messungen untersucht werden kann. Der Prüfkörper ist in vier Segmente zerteilt, so dass auch innenliegende, raue Gussfreiformflächen der taktilen Koordinatenmessung zugänglich sind. Durch adaptierte Rubinkugeln als Referenzstrukturen können die CT-Messdaten in taktile Referenz-Koordinatensysteme überführt werden. Um den Einfluss von Materialien unterschiedlicher Schwächung auf das dimensionelle Messen mit CT zu untersuchen, wurden stärker schwächende ZTA-Störkugeln (Zirconia Toughened Alumina) mit zur Ausrichtung geeigneter Symmetriebrechung in der Nähe von ausgewählten taktilen Messstellen angebracht. Zur Bewertung der Messabweichungen dienen taktile Referenzmessungen an den ZTA-Kugeln sowie taktile Messungen an den Freiformflächen des Gussteils, wobei durch ein iteratives Antastverfahren eine verbesserte Erfassung der Geometrie auch bei starken lokalen Oberflächenkrümmungen sichergestellt wird. T2 - DGZfP-Jahrestagung 2011 CY - Bremen, Germany DA - 30.05.2011 KW - Mikro-CT KW - Dimensionelles Messen KW - Testkörper KW - Multimaterial PY - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-248878 SN - 978-3-940283-33-7 IS - DGZfP-BB 127 (Di.1.B.2) SP - 1 EP - 6 PB - Deutsche Gesellschaft für Zerstörungsfreie Prüfung (DGZfP) AN - OPUS4-24887 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Staude, Andreas A1 - Goebbels, Jürgen T1 - Ortsauflösung in der Computertomographie - Vergleich von MTF und Linienpaarstrukturen N2 - Anhand von Messungen an geeigneten Prüfkörpern werden die beiden etablierten Verfahren zur Bestimmung der räumlichen Auflösung von CTDaten (MTF und Kontrast von Linienpaaren), wie in den entsprechenden Normen beschrieben, durchgeführt und ihre Ergebnisse verglichen. T2 - DGZfP-Jahrestagung 2011 CY - Bremen, Germany DA - 30.05.2011 PY - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-249775 SN - 978-3-940283-33-7 IS - DGZfP-BB 127 (Mo.3.B.1) SP - 1 EP - 10 PB - Deutsche Gesellschaft für Zerstörungsfreie Prüfung (DGZfP) AN - OPUS4-24977 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Vercoutère, C. A1 - Müller, K. A1 - Chiotti, L. A1 - Nespoulet, R. A1 - Staude, Andreas A1 - Riesemeier, Heinrich A1 - Reiche, I. T1 - Rectangular beads from the final gravettian level of the Abri Pataud: raw material identification and its archaeological implications N2 - The Final Gravettian level (level 2) of the abri Pataud (Dordogne, France) yielded a large assemblage of body ornaments that consists essentially of 85 quite standardized rectangular beads. Some uncertainty remained about the raw material in which these small beads were made: mammoth ivory, reindeer antler or bone? Non-invasive methods were employed in order to determine the raw material. First chemical analyses using microbeam Proton Induced X-ray Emission analysis (microPIXE) did not enable us to conclude definitively. Therefore, synchrotron and laboratory X-ray microtomography (microCT) were applied on eight beads and allowed us to identify ivory for all of them except for one, which shows slightly different morphological features. KW - Abri Pataud KW - Gravettien final KW - Ivoire de mammouth KW - MicroPIXE KW - MicroCT KW - Perles rectangulaires KW - Final Gravettian KW - Mammoth ivory KW - Rectangular beads PY - 2011 SN - 1960-1360 VL - 35 SP - 259 EP - 271 PB - Presses Univ. de Rennes CY - Rennes AN - OPUS4-26250 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Neuschaefer-Rube, U. A1 - Bartscher, M. A1 - Schulze, M. A1 - Neukamm, M. A1 - Staude, Andreas A1 - Goebbels, Jürgen T1 - Messung von Mikrogeometrien mit industrieller Computertomographie N2 - Die industrielle Computertomographie (CT) ist ein gut bekanntes Verfahren zur zerstörungsfreien Prüfung von Werkstücken. In den letzten Jahren wird die CT aber zunehmend auch für dimensioneile Messungen von Werkstücken eingesetzt. Der wesentliche Vorteil der CT liegt in der Kompletterfassung mit hoher Messpunktdichte, die auch für andere Messverfahren unzugängliche, innere Geometrien einschließt. An kleinen Bauteilen können Strukturen bis herunter zu wenigen Mikrometern gemessen werden, wodurch sich das Verfahren gut für die Messung von Mikroteilen eignet. Nachteilig ist, dass viele Einflussgrößen das Messergebnis beeinflussen, was die Rückführung der Messergebnisse, die Bestimmung der Messunsicherheit und die Definition von Spezifikationen für CT-Anlagen erschwert. Der Beitrag stellt nach einer Einführung in das Verfahren Anwendungsbeispiele der CT an Mikroteilen vor. Darüber hinaus geht der Beitrag auf Prüfkörper und -verfahren zur Einmessung und Überprüfung von CT-Anlagen ein und berichtet über aktuelle Normungsaktivitäten. Abschließend werden Möglichkeiten zur weiteren Steigerung der Auflösung aufgezeigt, um zukünftig möglicherweise auch Nanogeometrien messen zu können. T2 - 4. Fachtagung Metrologie in der Mikro- und Nanotechnik 2011 - Messprinzipien - Messgeräte - Anwendungen CY - Erlangen, Germany DA - 25.10.2011 PY - 2011 SN - 978-3-18-092133-4 SN - 0083-5560 N1 - Serientitel: VDI-Berichte – Series title: VDI-Berichte VL - 2133 SP - 137 EP - 148 PB - VDI-Verl. CY - Düsseldorf AN - OPUS4-26251 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bartscher, M. A1 - Staude, Andreas A1 - Ehrig, Karsten A1 - Ramsey, A. T1 - The influence of data filtering on dimensional measurements with CT N2 - Data processing is an essential part of the evaluation of measurement results, e.g. in X-ray computed tomography (CT). Some of these calculations are denoted as 'filtering'. Filtering is always a trade-off between an enhancement of data quality and a loss of information. The standard reconstruction technique for CT data is t he filtered back-projection. Additionally to the high-pass filter inherent to this technique, a suppression of high-frequency noise is in most cases also necessary. Many different possible filter algorithms are found in the literature. Although their effect on the signal-to-noise ratio and the spatial resolution is well-studied, it is not obvious how the different filters affect the determination of the object's surface in the reconstructed data and, thus, the results of dimensional CT measurements. We compare the results of industrial dimensional CT measurements obtained at the same data set of a calibrated reference standard – a calotte cube – when using different filters and discuss the implications. Filters under investigation are mainly median filters on projections and as well filters during filtered backprojection and filters on the reconstructed volume. T2 - 18th WCNDT - World conference on nondestructive testing CY - Durban, South Africa DA - 2012-04-16 KW - Computed tomography (CT) KW - Dimensional measurement KW - Data filtering KW - Resolution PY - 2012 SN - 978-0-620-52872-6 SP - 1 EP - 13 (Paper 429) AN - OPUS4-26252 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Staude, Andreas A1 - Goebbels, Jürgen A1 - Bartscher, M. A1 - Hilpert, U. A1 - Koch, M. A1 - Reinhart, C. T1 - Genauigkeitssteigerung der Defekterkennung in Gussteilen mit Computertomographie (CT) am Beispiel eines Aluminium-Zylinderkopfsegments T2 - DACH-Jahrestagung 2008 - Zerstörungsfreie Materialprüfung, ZfP in Forschung, Entwicklung und Anwendung CY - St. Gallen, Schweiz DA - 2008-04-28 PY - 2008 SN - 978-3-940283-09-2 IS - DGZfP-BB 113 (Di.2.A.3) SP - 1 EP - 7 AN - OPUS4-18297 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Kamenz, C. A1 - Staude, Andreas T1 - Look through the lung book and don't miss a thing PY - 2008 UR - http://www.helmholtz-berlin.de/media/media/oea/web/pr_webseite/druckschriften/infos/bessy/highlights2007.pdf#page=36 SN - 1611-6127 SP - 36 EP - 37 PB - Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung CY - Berlin AN - OPUS4-17781 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Staude, Andreas A1 - Hilpert, U. A1 - Koch, M. A1 - Goebbels, Jürgen T1 - Methode und Prüfkörper zum Nachweis von Gussdefekten in Aluminiumbauteilen mit Computertomographie T2 - DGZfP-Jahrestagung 2009 CY - Münster, Germany DA - 2009-05-18 PY - 2009 AN - OPUS4-18391 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Schmitt, R. A1 - Koerfer, F. A1 - Sadowny, O. A1 - Zimmermann, J. A1 - Krüger-Sehm, R. A1 - Xu, M. A1 - Dziomba, T. A1 - Koenders, L. A1 - Goch, G. A1 - Tausendfreund, A. A1 - Patzelt, S. A1 - Simon, S. A1 - Rockstroh, L. A1 - Bellon, Carsten A1 - Staude, Andreas A1 - Woias, P. A1 - Goldschmidtböing, F. A1 - Rabold, M. T1 - Virtuelle Messgeräte - Definition und Stand der Entwicklung N2 - Die Mikro- und Nanotechnologie gehört zu den Schlüsseltechnologien des 21. Jahrhunderts mit hohen Wachstumsprognosen, wie auch die im Auftrag des BMBF durchgeführte Studie “Nanotechnologie als wirtschaftlicher Wachstumsmarkt” von 2004 ausführlich darstellt. Aus diesem Trend resultiert ein steigender Bedarf an Messsystemen, die Nanostrukturen prozessnah bzw. im Fertigungsprozess charakterisieren können. Virtuelle Messgeräte liefern Erkenntnisse zur Entwicklung neuartiger Messsysteme, Analyse und Optimierung bestehender Verfahren sowie die Bestimmung der Messunsicherheit und modellbasierten Korrektur systematischer Fehler. Der virtuelle Messprozess umfasst neben dem Messmittel auch die Probe und die Wechselwirkungen zwischen beiden. In diesem Beitrag werden virtuelle Messgeräte vorgestellt sowie deren Anwendung diskutiert. N2 - Micro- and nanotechnology experienced a high economic growth in recent years. This yields in a growing demand for measuring instruments which are closely linked to the production process. Virtual measuring instruments provide knowledge for the development of new systems, the analysis and optimization of established devices as well as the determination of the uncertainty in measurement. The virtual measuring process consists of the measuring instrument, the sample, and the interaction between both. In this article examples of current developments of virtual instruments are presented and their way of utilization is discussed. KW - Virtuelle Messtechnik KW - Simulation KW - Messunsicherheit KW - Virtual metrology KW - Measurement uncertainty PY - 2008 U6 - https://doi.org/10.1524/teme.2008.0872 SN - 0340-837X SN - 0178-2312 SN - 0171-8096 VL - 75 IS - 5 SP - 298 EP - 310 PB - Oldenbourg CY - München AN - OPUS4-17569 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Staude, Andreas A1 - Goebbels, Jürgen A1 - Bartscher, M. A1 - Hilpert, U. A1 - Koch, M. A1 - Reinhart, C. T1 - Genauigkeitssteigerung der Defekterkennung in Gussteilen mit Computertomographie (CT) am Beispiel eines Aluminium-Zylinderkopfsegments T2 - DACH-Jahrestagung 2008 CY - St. Gallen, Switzerland DA - 2008-04-28 PY - 2008 AN - OPUS4-18479 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Staude, Andreas A1 - Goebbels, Jürgen A1 - Bartscher, M. A1 - Hilpert, U. A1 - Koch, M. A1 - Reinhart, C. T1 - Genauigkeit der Defekterkennung in Gussteilen mit Computertomographie (CT) am Beispiel eines Aluminium-Zylinderkopfsegments T2 - DACH-Jahrestagung 2008 CY - St. Gallen, Switzerland DA - 2008-04-28 PY - 2008 AN - OPUS4-18498 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Staude, Andreas A1 - Ehrig, Karsten A1 - Goebbels, Jürgen A1 - Schulze, Manfred A1 - Bartscher, M. T1 - Dimensionelles Messen von Mikrobauteilen mit Synchrotron-CT an der BAMline bei BESSY II T2 - SNI2010 CY - Berlin, Germany DA - 2010-02-24 PY - 2010 AN - OPUS4-20184 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Ehrig, Karsten A1 - Bartscher, M. A1 - Goebbels, Jürgen A1 - Härtig, F. A1 - Kniel, K. A1 - Neukamm, M. A1 - Neuschaefer-Rube, U. A1 - Staude, Andreas ED - Denecke, M. ED - Walker, C. T1 - Dimensional control of micro components with synchrotron computed tomography T2 - 20th International congress on X-ray optics and microanalysis CY - Karlsruhe, Germany DA - 2009-09-14 KW - Synchrotron radiation KW - Computed tomography KW - Dimensional measurement KW - Micro components PY - 2010 SN - 978-0-7354-0764-0 SN - 0094-243X SP - 164 EP - 171 PB - American Institute of Physics AN - OPUS4-21293 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Staude, Andreas A1 - Ehrig, Karsten A1 - Goebbels, Jürgen A1 - Bartscher, M. A1 - Hilpert, U. A1 - Koch, M. T1 - Methode und Prüfkörper zum Nachweis von Gussdefekten in Aluminiumbauteilen mit Computertomographie T2 - DGZfP-Jahrestagung 2009 CY - Münster, Deutschland DA - 2009-05-18 PY - 2009 SN - 978-3-940283-16-0 IS - DGZfP-BB 115 (Mi.4.B.2) SP - 1 EP - 8 AN - OPUS4-20728 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Illerhaus, Bernhard A1 - Staude, Andreas A1 - Meinel, Dietmar T1 - Nondestructive insights into composition of the sculpture of Egyptian Queen Nefertiti with CT and the dependence of object surface from image processing N2 - Precautions in the generation of surfaces from CT images should be the rule. Two different data sets of the bust of Nefertiti and additional data from an industrial CT scanner will show the conflicts that arise when defining a surface. The recent trend in CT is to extract surfaces from CT measurements which can compete with the accuracy of tactile measurements. As CT is complicated by artefacts, a lot of precautions need to be taken in order to get exact results. More errors are introduced, if the surface of an object made from different dense materials is calculated. A publication in April 2009 of "Radiology" dealt with the surface of the stone behind the stucco layer of the famous bust of the Egyptian Queen Nefertiti in the Ägytische Museum Berlin. Using this data, we will show the different problems that arise from inadequate image processing. Furthermore, a detailed comparison of the two CT measurements made 14 years apart is given. Conclusions: Respect the traps in virtual imaging. KW - Image processing (computer-assisted) KW - Computed X ray tomography KW - Artifacts KW - Implants KW - Computertomographie KW - Oberfläche KW - Oberflächenbestimmung PY - 2009 UR - https://www.ndt.net/search/docs.php3?id=8043 SN - 1435-4934 VL - 14 IS - 9 SP - 1 EP - 11 PB - NDT.net CY - Kirchwald AN - OPUS4-20840 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Staude, Andreas A1 - Krahl, Thoralf A1 - Goebbels, Jürgen A1 - Büttgenbach, S. T1 - Ein dreidimensionaler Prüfkörper für die Lunkererkennung in Gussteilen mittels Coputertomographie T2 - CT-Konferenz, FH Wels CY - Österreich DA - 2009-09-27 PY - 2009 AN - OPUS4-20867 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Bartscher, M. A1 - Neukamm, M. A1 - Hilpert, U. A1 - Neuschaefer-Rube, U. A1 - Härtig, F. A1 - Kniel, K. A1 - Ehrig, Karsten A1 - Staude, Andreas A1 - Goebbels, Jürgen T1 - Achieving traceability of industrial computed tomography KW - Industrial computed tomography (CT) KW - Coordinate metrology KW - Traceability PY - 2010 U6 - https://doi.org/10.4028/www.scientific.net/KEM.437.79 SN - 1013-9826 VL - 437 SP - 79 EP - 83 PB - Trans Tech Publ. CY - Aedermannsdorf AN - OPUS4-20985 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schulze, M. A1 - Neugebauer, M. A1 - Meeß, R. A1 - Brzoska, J. A1 - Jung, A. A1 - Staude, Andreas A1 - Ehrig, Karsten T1 - Der Einfluss unterschiedlicher Materialzusammensetzungen auf das dimensionelle Messen von Mikroobjekten mittels Mikro-Computertomographie N2 - Computertomographische Aufnahmen von Objekten mit stark voneinander abweichenden Absorptionseigenschaften stellen sowohl für den Anwendungsbereich der zerstörungsfreien Prüfung als auch für den der dimensionellen Messtechnik eine besondere Herausforderung dar. Die Aufnahmekonfiguration kann bei Objekten dieser Art häufig nicht so gewählt werden, dass die unterschiedlichen Materialeigenschaften mit ausreichender Qualität abgebildet werden können. Aus diesem Grund ist eine objektive Bewertung der Oberflächenmessung mit Hilfe eines in dieser Untersuchung eingeführten Qualitätsmaßes erforderlich. Anhand der in dieser Arbeit vorgestellten Prüfkörperserie soll der Einfluss der Materialzusammensetzung auf das dimensionelle Messen mit CT erfasst und charakterisiert werden. Unter Berücksichtigung der Qualitätsbewertung der Oberflächenpunkte erfolgt die Berechnung der Form- und Abstandsabweichungen. Ziel ist es, die Genauigkeit der Oberflächenmessung hinsichtlich unterschiedlicher Aufnahmeparameter und Materialzusammensetzungen darzustellen. Anhand dieser Ergebnisse ist es möglich, den computertomographischen Aufnahme- und Auswertungsprozess quantitativ zu bewerten und Ursachen der Abweichungen zu diskutieren. T2 - DGZfP-Jahrestagung 2010 CY - Erfurt, Deutschland DA - 2010-05-10 PY - 2010 UR - http://www.ndt.net/article/dgzfp2010/Inhalt/di2a4.pdf SN - 978-3-940283-26-9 IS - DGZfP-BB 122 (Di.2.A.4) SP - 1 EP - 9 CY - Berlin AN - OPUS4-22528 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Neukamm, M. A1 - Schulze, M. A1 - Staude, Andreas T1 - Untersuchung der geometrischen Eigenschaften industrieller CT mit Hilfe eines neuartigen Prüfkörpers und den Methoden der Photogrammetrie N2 - Anhand des hier vorgestellten zylindrischen Prüfkörpers, an dem Kugeln aus einem Material mit einem hohen Absorptionskoeffizienten und sehr geringen Formabweichungen angebracht wurden, können die geometrischen Eigenschaften von CT-Anlagen untersucht werden. Die Basis der Auswertung bilden die radiometrischen Aufnahmen. Mit Hilfe eines angepassten Ellipsenoperators werden die Mittelpunkte der in den radiometrischen Aufnahmen überlagerungsfrei abgebildeten Kugeln ermittelt. Anhand dieser Mittelpunkte können die geometrischen Eigenschaften des Gesamtsystems zunächst rein an den sich daraus ergebenen Spuren diskutiert und in einem weiteren Schritt photogrammetrisch mit Hilfe der Bündelblockausgleichung ausgewertet werden. Die Untersuchungen zeigen, dass der Prüfkörper geeignet ist, die geometrischen Eigenschaften von CT-Anlagen zu überwachen. In einem weiteren Schritt könnte das vorgestellte Verfahren benutzt werden, um z.B. Abweichungen von Drehtischen zu charakterisieren und ggf. zu korrigieren. T2 - DGZfP-Jahrestagung 2010 CY - Erfurt, Deutschland DA - 2010-05-10 PY - 2010 SN - 978-3-940283-26-9 IS - DGZfP-BB 122 (Di.2.A.2) SP - 1 EP - 12 CY - Berlin AN - OPUS4-22529 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Staude, Andreas A1 - Müller, Katharina A1 - Goebbels, Jürgen A1 - Riesemeier, Heinrich A1 - Reiche, I. A1 - Large, D. T1 - Synchrotron radiation micro x-ray tomography - a useful tool for the identification of prehistoric bone materials T2 - "SR2A - Synchroton Radiation in Art an Archaeometry" CY - Amsterdam, Netherlands DA - 2010-11-07 PY - 2010 AN - OPUS4-22513 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Staude, Andreas A1 - Neukamm, Marko A1 - Schulze, Matthias T1 - Untersuchung der geometrischen Eigenschaften industrieller CT mit Hilfe eines neuartigen Prüfkörpers und den Methoden der Photogrammetrie T2 - DGZfP-Jahrestagung CY - Erfurt, Germany DA - 2010-05-10 PY - 2010 AN - OPUS4-22525 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Ehrig, Karsten A1 - Bartscher, M. A1 - Goebbels, Jürgen A1 - Schulze, M. A1 - Staude, Andreas T1 - Dimensionelles Messen unter Phasenkontrast mit Synchrotron Computertomographie N2 - Phasenkontrastmessungen haben sich als hilfreich bei der Kantenfindung von Strukturen mit nur geringem Absorptionskontrast erwiesen. Solche Messungen können besonders gut mit monochromatischer Röntgenstrahlung hoher räumlicher Kohärenz durchgeführt werden, wie sie bei der Synchrotron- Computertomographie (SY-CT) benutzt wird. Nachteilig wirken sich allerdings die Phasenverschiebung des Synchrotronstrahls über das Strahlprofil und damit die Kantenverbreiterung in den zu untersuchenden Strukturen aus. Daher ist ein dimensionelles Messen mit normalen Rekonstruktionsverfahren nicht möglich. In der vorliegenden Arbeit werden neue Filterverfahren zur Korrektur der Phasenverschiebung unter Beibehaltung des erhöhten Kontrastes bei der Rekonstruktion angewandt, um ausgewählte einkomponentige Referenzobjekte hinsichtlich der dimensionellen Messeigenschaften zu untersuchen. Als Referenz werden rückgeführte Messungen mit taktilen Koordinatenmessmaschinen herangezogen. Die Untersuchungen wurden im freien Strahl durch Variation des Abstandes zwischen Objekt und Detektor am Strahlrohr der BAM am Helmholtz- Zentrum Berlin für Materialien und Energie - Speicherring BESSY II durchgeführt. T2 - DGZfP-Jahrestagung 2010 CY - Erfurt, Deutschland DA - 2010-05-10 PY - 2010 SN - 978-3-940283-26-9 IS - DGZfP-BB 122 (Di.2.A.3) SP - 1 EP - 9 CY - Berlin AN - OPUS4-23208 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Staude, Andreas A1 - Krah, T. A1 - Goebbels, Jürgen A1 - Büttgenbach, S. T1 - Ein dreidimensionaler Prüfkörper für die Lunkererkennung in Gussteilen mittels Computertomographie T2 - Fachtagung Industrielle Computertomografie - Zerstörungsfreie Bauteilprüfung, 3D-Materialcharakterisierung und Geometriebestimmung CY - Wels, Österreich DA - 2010-09-27 KW - Computertomographie KW - Gussteile KW - Gussdefekte KW - Lunker KW - Prüfkörper PY - 2010 SN - 978-3-8322-9418-2 SN - 1610-4773 SP - 79 EP - 84 PB - Shaker Verlag GmbH CY - Aachen AN - OPUS4-23176 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Staude, Andreas A1 - Bartscher, M. A1 - Bremer, Holger A1 - Birth, Thomas A1 - Ehrig, Karsten T1 - The resolution of dimensional CT - an edge-based analysis T2 - Conference on Industrial Computed Tomography CY - Wels, Austria DA - 2012-09-19 PY - 2012 AN - OPUS4-26612 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CHAP A1 - Ritter, Z. A1 - Staude, Andreas A1 - Prohaska, S. A1 - Felsenberg, D. ED - Naik, G.R. T1 - Osteocytes characterization using synchrotron radiation CT and finite element analysis PY - 2012 UR - http://www.intechopen.com/articles/show/title/osteocytes-characterization-using-synchrotron-radiation-ct-and-finite-element-analysis SN - 978-953-51-0412-4 U6 - https://doi.org/10.5772/35242 IS - Chapter 7 SP - 165 EP - 190 PB - InTech CY - Rijeka, Croatia AN - OPUS4-25845 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Staude, Andreas A1 - Neukamm, M. T1 - Bestimmen der geometrischen Eigenschaften industrieller CT T2 - Oldenburger 3D-Tage 2011 CY - Oldenburg, Germany DA - 2011-02-01 PY - 2011 AN - OPUS4-26125 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Staude, Andreas A1 - Bartscher, M. A1 - Ehrig, Karsten A1 - Ramsay, A. T1 - The Influence of Data Filtering on Dimensional Measurements with CT T2 - WCNDT 2012 CY - Durban, South Africa DA - 2012-04-16 PY - 2012 AN - OPUS4-26126 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Staude, Andreas A1 - Ehrig, Karsten A1 - Krebs, Holger T1 - Properties of the inner structure of ammonium nitrate prills T2 - HZB Users Meeting 2013 CY - Berlin, Germany DA - 2013-12-04 PY - 2013 AN - OPUS4-29677 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Staude, Andreas A1 - Hoch, H. A1 - Wessel, A. A1 - Asche, M. A1 - Baum, D. A1 - Beckmann, F. A1 - Bräunig, P. A1 - Ehrig, Karsten A1 - Mühlethaler, R. T1 - Non-Sexual Abdominal Appendages in Adult Insects Challenge a 300 Million Year Old Bauplan T2 - HZB Users Meeting 2013 CY - Berlin, Germany DA - 2013-12-04 PY - 2013 AN - OPUS4-29676 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Kupsch, Andreas A1 - Lange, Axel A1 - Hentschel, Manfred P. A1 - Onel, Yener A1 - Wolk, Thomas A1 - Staude, Andreas A1 - Ehrig, Karsten A1 - Müller, Bernd R. A1 - Bruno, Giovanni T1 - Evaluating porosity in cordierite diesel particulate filter materials, part 1 X-ray refraction N2 - Bi-continuous porous ceramics for filtration applications possess a particularly complicated microstructure, with porosity and solid matter being intermingled. Mechanical, thermal, and filtration properties can only be precisely estimated if the morphology of both solid matter and porosity can be quantitatively determined. Using x-ray absorption and refraction, we quantitatively evaluate porosity and pore orientation in cordierite diesel particulate filter ceramics. Porosity values turn out to agree with mercury intrusion measurements, while pore orientation factors agree with published crystallographic texture data. KW - Porous ceramics KW - Pore orientation KW - X-ray refraction KW - Synchrotron KW - Interface PY - 2013 U6 - https://doi.org/10.4416/JCST2013-00021 SN - 2190-9385 VL - 4 IS - 4 SP - 169 EP - 176 PB - Göller CY - Baden-Baden AN - OPUS4-29939 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Hoch, H. A1 - Wessel, A. A1 - Asche, M. A1 - Baum, D. A1 - Beckmann, F. A1 - Bräunig, P. A1 - Ehrig, Karsten A1 - Mühlethaler, R. A1 - Riesemeier, Heinrich A1 - Staude, Andreas A1 - Stelbrink, B. A1 - Wachmann, E. A1 - Weintraub, P. A1 - Wipfler, B. A1 - Wolff, C. A1 - Zilch, M. T1 - Non-sexual abdominal appendages in adult insects challenge a 300 million year old bauplan N2 - Despite their enormous diversity, the bauplan of adult winged insects (pterygotes) is remarkably conservative since the Lower Devonian: a five-segmented head, a three-segmented thorax with three pairs of walking legs and an eleven-segmented abdomen without any non-sexual appendages 1 and 2. The only known exceptions are the abdominal appendages of adult male sepsid flies on the fourth segment; however, these are also used as copulatory organs and are supposedly maintained through sexual selection [3]. Here, we report a rod-like paired appendage from the third and fourth abdominal segments in adults of the Southeast-Asian Hemiptera taxon Bennini (Figure 1A,B; Supplemental information). These are fully musculated, innervated, and movable and bear highly organized sensory and secretory units. The appendages, termed LASSO (lateral abdominal sensory and secretory organs), are consistent in topology and structure in all species studied and not sexually dimorphic. The existence of these non-sexual abdominal appendages reveals the potential of the 300 million year old conserved bauplan of insects. KW - CT KW - Bauplan KW - Adult insects KW - Abdominal appendages PY - 2014 U6 - https://doi.org/10.1016/j.cub.2013.11.040 SN - 0960-9822 SN - 1879-0445 VL - 24 IS - 1 SP - R16 EP - R17 PB - Cell Press CY - Cambridge, Mass. AN - OPUS4-30034 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Zocca, Andrea A1 - Wirth, Cynthia A1 - Staude, Andreas A1 - Bernardo, E. A1 - Günster, Jens A1 - Colombo, P. T1 - SiOC ceramics with ordered porosity by 3 D-printing of a preceramic polymer N2 - Ceramic parts possessing an ordered porosity were produced for the first time by powder-based three-dimensional printing of a preceramic polymer followed by pyrolysis in an inert atmosphere. The main parameters involved in the process were investigated, and the precision of the printed and ceramized parts was assessed by means of scanning electron microscopy and micro computed tomography. The influence of two different printing solvents was investigated and the use of a mixture of 1-hexanol and hexylacetate in particular allowed the production of parts with a relative density of 80% both in the polymeric and in the ceramic state. The mixing of a cross-linking catalyst directly with the printing liquid greatly simplified the process, minimizing the necessity of preprocessing the starting powder. Three-dimensional printing of a preceramic polymer not containing any inert or active fillers was proved to be a feasible, convenient and precise process for the production of porous ceramic possessing a complex, ordered structure, such as stretch-dominated lattices. KW - Polymer KW - Ceramic KW - Cellular PY - 2013 U6 - https://doi.org/10.1557/jmr.2013.129 SN - 0884-2914 N1 - Geburtsname von Wirth, Cynthia: Gomes, C. M. - Birth name of Wirth, Cynthia: Gomes, C. M. VL - 28 IS - 17 SP - 2243 EP - 2252 PB - Materials Research Society CY - Warrendale, Pa. AN - OPUS4-29441 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Staude, Andreas T1 - Computed tomography and its potential for cultural heritage studies N2 - Since the advent of industrial computed tomography (CT), this new analysis method has been used also for the investigation of objects of cultural heritage and art. CT provides the possibility to determine the inner and outer surfaces and to investigate the material structure without causing damage to the valuable objects. In this talk I will present examples of measurements performed at BAM, which demonstrate what CT can do for objects of diverse materials and for different objectives. T2 - Italian-German Worshop on "Technology and infrastructures for Cultural Heritage" CY - Bode-Museum, Berlin, Germany DA - 12.04.2016 KW - Computed tomography KW - Computertomographie KW - Cultural heritage KW - Art KW - Archaeology KW - Kulturelles Erbe KW - Kunst KW - Archäologie PY - 2016 AN - OPUS4-36162 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Forler, D. A1 - Schmidt, J. P. A1 - Staude, Andreas T1 - Ein Becken aus Beckentin! - Fund des Monats Mai 2016 N2 - Bronzezeitlicher Hortfund in Mecklenburg-Vorpommern mit CT-Untersuchung an der BAM KW - Computertomographie KW - Hortfund KW - Bronzezeit KW - Mecklenburg-Vorpommern PY - 2016 UR - http://www.kulturwerte-mv.de/cms2/LAKD1_prod/LAKD1/de/Landesarchaeologie/Fund_des_Monats/index.jsp SP - 1 EP - 3 CY - Schwerin AN - OPUS4-36163 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Onel, Yener A1 - Lange, Axel A1 - Staude, Andreas A1 - Ehrig, Karsten A1 - Kupsch, Andreas A1 - Hentschel, Manfred P. A1 - Wolk, Thomas A1 - Müller, Bernd R. A1 - Bruno, Giovanni T1 - Evaluating porosity in cordierite Diesel particulate filter materials, Part 2 statistical analysis of computed tomography data N2 - Complementary to Part 1 of this work, the bi-continuous microstructure of porous synthetic cordierite ceramics for filtration applications was investigated using 3D x-ray computed tomography at different resolutions. Applying both Fast Fourier Transform and a newly developed image analysis algorithm, we quantitatively evaluated porosity and pore orientation. The statistical approach allows extraction of spatially resolved or average values. Porosity values based on x-ray absorption agree with mercury intrusion measurements, while pore orientation factors agree with x-ray refraction data (Part 1 of this work), and with published crystallographic texture data. KW - Pore orientation KW - Porous ceramics KW - Computed tomography KW - 3D microstructure PY - 2013 U6 - https://doi.org/10.4416/JCST2013-00022 SN - 2190-9385 VL - 05 IS - 01 SP - 13 EP - 22 PB - Göller CY - Baden-Baden AN - OPUS4-30379 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Staude, Andreas A1 - Ehrig, Karsten A1 - Illerhaus, Bernhard A1 - Spreemann, M. T1 - Making use of phase-contrast in dimensional muCT-measurements of weakly absorbing objects N2 - The effects of refraction (phase-contrast) are normally considered as disturbances in high-resolution μCT-measurements. We show that in the case of small objects with low absorption a single-distance phase-retrieval algorithm not only reduces the edge enhancement, but also raises the signal-to-noise ratio sufficiently to allow dimensional measurements. This is exemplified at an optical element for optical fibre connectors. T2 - Conference on industrial computed tomography (ICT) 2014 CY - Wels, Austria DA - 2014-02-25 PY - 2014 SN - 978-3-8440-2557-6 SN - 1610-4773 SP - 405 EP - 410 PB - Shaker Verlag GmbH AN - OPUS4-30325 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bruno, Giovanni A1 - Ehrig, Karsten A1 - Haarring, Holger A1 - Harwardt, Michael A1 - Hentschel, Manfred P. A1 - Illerhaus, Bernhard A1 - Kupsch, Andreas A1 - Lange, Axel A1 - Meinel, Dietmar A1 - Müller, Bernd R. A1 - Onel, Yener A1 - Staude, Andreas A1 - Wolk, Thomas T1 - Industrial and synchrotron X-ray CT applications for materials characterisation N2 - The combination of tomographic, microstructural data with other experimental techniques and with modeling is paramount, if we want to extract the maximum amount of information on material and component properties. In particular, quantitative image analysis, statistical approaches, direct discretization of tomographic reconstructions represent concrete possibilities to extend the power of the tomographic 3D representation to insights into the material and component performance. This logic thread holds equally for industrial and academic research, and valorizes expensive experiments such as those carried out at synchrotron sources, which cannot be daily repeated. We shall show a few examples of possible use of X-ray tomographic data for quantitative assessment of damage evolution and microstructural properties, as well as for non-destructive testing. We will also show how X-ray refraction computed tomography (CT) can be highly complementary to classic absorption CT, being sensitive to internal interfaces. T2 - iCT Conference 2014 - Conference on industrial computed tomography CY - Wels, Austria DA - 25.02.2014 KW - X-ray absorption and refraction CT KW - Quantitative image analysis KW - Statistical analysis KW - Complex microstructure PY - 2014 SN - 978-3-8440-2557-6 SP - 15 EP - 31 PB - Shaker CY - Aachen AN - OPUS4-30484 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bruno, Giovanni A1 - Hentschel, Manfred P. A1 - Onel, Yener A1 - Lange, Axel A1 - Kupsch, Andreas A1 - Wolk, Thomas A1 - Staude, Andreas A1 - Ehrig, Karsten A1 - Müller, Bernd R. T1 - Bewertung von Porositätsparametern in Cordierit-Diesel-Partikelfilter-Materialien mit fortgeschrittenen Röntgenverfahren und statistischer Analyse N2 - Bikontinuierliche poröse Keramiken für Filteranwendungen weisen eine komplizierte Mikrostruktur auf, in der Poren und Festkörperphase 'vermischt' sind. Mechanische, thermische sowie Filtereigenschaften können nur präzise bestimmt werden, wenn die Morphologie beider Phasen quantitativ angegeben werden kann. Hier werden unter Anwendung von 3D Computertomographie (CT) und verschiedenen Techniken, die auf der Röntgenrefraktion basieren, die Porosität und die Porenorientierung in keramischen Cordierit-Dieselpartikelfiltern bewertet. Dabei werden zur Auswertung der Tomogramme die Fouriertransformierten sowie eine neu entwickelte richtungssensitive Bildanalyse (DIVA, directional interface variance analysis) angewandt. Sowohl die genannten Messtechniken als auch der statistische Ansatz gestatten die Extraktion optional ortsaufgelöster oder gemittelter Werte. Es ergeben sich sehr gute Übereinstimmungen der experimentell ermittelten Porositätswerte mit Ergebnissen aus Quecksilberintrusionsversuchen als auch der ermittelten Porenorientierung im Vergleich zu publizierten Angaben zur kristallographischen Textur. Dies legt den Schluss nahe, dass die Kenntnis der Grenzflächen (zwischen Poren und Materie) genügt, die morphologischen Eigenschaften solcher Materialien hinreichend zu beschreiben. T2 - DGZfP-Jahrestagung 2014 CY - Potsdam, Germany DA - 26.05.2014 KW - Cordierit KW - Poröse Keramik KW - Porenorientierung KW - Röntgenrefraktion KW - Computer-Tomographie KW - 3D-Mikrostruktur PY - 2014 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-312946 SN - 978-3-940283-61-0 VL - 148 SP - 1 EP - 8 PB - Deutsche Gesellschaft für Zerstörungsfreie Prüfung (DGZfP) CY - Berlin AN - OPUS4-31294 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Staude, Andreas A1 - Ehrig, Karsten A1 - Illerhaus, Bernhard A1 - Spreemann, M. T1 - Making Use of Phase-Contrast in Dimensional uCT-measurements of Weakly Absorbing Objects T2 - Conference on Industrial Computed Tomography (ICT) CY - Wels, Austria DA - 2014-02-25 PY - 2014 AN - OPUS4-30307 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Staude, Andreas A1 - Ehrig, Karsten A1 - Krebs, Holger T1 - Bestimmung der Porosität und der inneren Oberfläche von Ammoniumnitratprills PY - 2014 SN - 0941-4584 VL - 36 IS - 1 SP - 4 EP - 6 PB - Deutscher Sprengverband CY - Siegen AN - OPUS4-30528 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Kupsch, Andreas A1 - Lange, Axel A1 - Hentschel, Manfred P. A1 - Onel, Yener A1 - Wolk, Thomas A1 - Staude, Andreas A1 - Ehrig, Karsten A1 - Müller, Bernd R. A1 - Bruno, Giovanni T1 - Evaluating porosity in cordierite diesel particulate filter materials: advanced X-ray techniques and new statistical analysis methods N2 - Bi-continuous porous ceramics for filtration applications possess a particularly complicated microstructure, whereby porosity and solid matter are intermingled. Mechanical, thermal, and filtration properties can only be precisely estimated if the morphology of both solid matter and porosity can be quantitatively determined. Using 3D computed tomography (CT) at different resolutions, and several X-ray refraction-based techniques, we quantitatively evaluated porosity and pore orientation in cordierite diesel particulate filter ceramics.Moreover, applying both Fast Fourier Transform (FFT) and a newly developed image analysis algorithm (directional interface variance analysis, DIVA), we quantitatively evaluated porosity and pore orientation. Both the experimental techniques and the statistical approach allow extraction of spatially resolved or average values.Porosity values from synchrotron computed tomography used turn out to agree with mercury intrusion measurements, while pore orientation factors agree with published crystallographic texture data. This latter point also implies that the study of the pore/matter interface is sufficient to describe the morphological properties of these materials. KW - Diesel particulate filters KW - DIVA Algorithm KW - Pore Orientation KW - Porous Ceramics KW - X-Ray Computed Tomography KW - X-Ray Refraction PY - 2014 U6 - https://doi.org/10.4028/www.scientific.net/AST.91.64 SN - 1662-0356 VL - 91 SP - 64 EP - 69 PB - Techna CY - Faenza AN - OPUS4-32069 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Kupsch, Andreas A1 - Lange, Axel A1 - Hentschel, Manfred P. A1 - Bruno, Giovanni A1 - Onel, Yener A1 - Wolk, Thomas A1 - Staude, Andreas A1 - Ehrig, Karsten A1 - Müller, Bernd R. T1 - Evaluating porosity in cordierite diesel particulate filter materials: advanced X-ray techniques and new statistical analysis methods T2 - ECNDT 2014 - 11th European conference on non-destructive testing CY - Prague, Czech Republic DA - 2014-10-06 KW - Porous ceramics KW - Diesel particulate filters KW - Pore orientation KW - X-ray computed tomography KW - X-ray refraction KW - DIVA algorithm KW - Phase contrast KW - Edge artefact KW - Soft matter radiography KW - Wavelet transform KW - Huygens elementary waves PY - 2014 SN - 978-80-214-5018-9 SP - 1 EP - 8(?) AN - OPUS4-31973 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Recknagel, Christoph A1 - Staude, Andreas T1 - Leiser Straßenverkehr - Leise Straßenbeläge KW - Infrastruktur KW - Strukturaufklärung KW - Leise Fahrbahnbeläge PY - 2014 UR - http://www.strassenforschung.de/ SP - 1 EP - 44(?) AN - OPUS4-31452 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Meinel, Dietmar A1 - Staude, Andreas A1 - Ehrig, Karsten ED - Bernard, D. ED - Buffière, J.-Y. ED - Pollock, T. ED - Poulsen, H.F. ED - Rollett, A. ED - Uchic, M. T1 - Analyzing microstructure and damage in construction materials with 3D micro CT N2 - This poster presentation gives an overview of the great potential of X-ray micro computed tomography (CT) to cast light on the evolution of the microstructure in construction materials. Prevention of damage is of major economic and social importance in the development of suitable construction materials such as concrete and asphalt. Therefore a non-destructive testing method such as CT is an appropriate tool for visualization of the inner structure. Its combination with other test methods allows understanding the damage processes such as crack propagation or corrosion. We show examples of internal structure analyses on a wide range of materials: Automatic 3D crack detection and the visualization of corrosion products inside of steel reinforced concrete, pore and shape analysis of lightweight aggregates and the visualization of deformation of high-pressure loaded aerated concrete specimens, distribution of aggregates inside concrete, and determination of the surface of porous asphalt core samples. Segmented structures serve, e.g., as input data for simulation of transport phenomena or virtual load tests. T2 - 2nd International congress on 3D materials science 2014 CY - Annecy, France DA - 29.06.2014 KW - X-ray computed tomography KW - Concrete KW - Asphalt KW - Corrosion KW - Crack detection KW - 3D visualization PY - 2014 SP - 23 EP - 28 PB - Wiley AN - OPUS4-31069 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Ehrig, Karsten A1 - Staude, Andreas A1 - Goebbels, Jürgen A1 - Bartscher, M. A1 - Koch, M. A1 - Neukamm, M. ED - Kastner, J. T1 - Evaluierung von Testkörpern zur Strahlaufhärtungskorrektur beim dimensionellen Messen mit Computertomographie T2 - Industrielle Computertomografie Tagung CY - Wels, Österreich DA - 2010-09-27 KW - Testkörper KW - Strahlaufhärtung KW - CT KW - Dimensionelles Messen PY - 2010 SN - 978-3-8322-9418-2 SN - 1610-4773 SP - 181 EP - 186 PB - Shaker Verlag GmbH AN - OPUS4-22033 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Illerhaus, Bernhard A1 - Staude, Andreas A1 - Meinel, Dietmar T1 - Das zweite Gesicht der Nofretete KW - Computertomographie KW - Oberfläche KW - Oberflächenbestimmung PY - 2009 SN - 1616-069X SN - 0948-5112 VL - 116 SP - 52 EP - 56 PB - Deutsche Gesellschaft für Zerstörungsfreie Prüfung CY - Berlin AN - OPUS4-20108 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Staude, Andreas A1 - Ehrig, Karsten A1 - Schulze, Matthias A1 - Neugebauer, M. A1 - Meeß, R. A1 - Brzoska, J. A1 - Jung, A. T1 - Der Einfluss unterschiedlicher Materialzusammensetzungen auf das dimensionelle Messen von Mikroobjekten mittels µCT T2 - DGZfP-Jahrestagung 2010 CY - Erfurt, Germany DA - 2010-05-10 PY - 2010 UR - http://www.ndt.net/article/dgzfp2010/Inhalt/di2a4.pdf AN - OPUS4-22627 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Staude, Andreas A1 - Bartscher, M. A1 - Ehrig, Karsten A1 - Goebbels, Jürgen A1 - Koch, M. A1 - Neuschaefer-Rube, U. A1 - Nötel, Jörg T1 - Quantification of the capability of micro-CT to detect defects in castings using a new test piece and a voxel-based comparison method N2 - We present a modified aluminium casting which is especially suited as test piece for measuring casting defects and the geometry by means of cone-beam micro-focus X-ray systems, and which may become a reference standard for dimensional measurements and defect detection. To obtain a test piece with inner geometries measured by tactile means, we divided a small aluminium cylinder head into four pieces in such a way that most inner surfaces can be reached with a tactile probe. Reference geometries (spheres and cylinders) were applied to define a coordinate system for aligning the measurements in the disassembled and re-assembled state. The four pieces were re-assembled after the tactile measurement. The test piece also contains casting defects. In order to be able to use the assembled cylinder head as reference sample for defect detection, measurements with higher spatial resolution and better signal-to-noise ratio were performed on the single parts. For improving the reliability of the reference measurements, CT measurements of each part were carried out in three different orientations, and the individual defect detections were combined to obtain a reference data set with a high probability of defect detection and a low rate of erroneous detections. A new method for comparing the defect detection in a CT measurement to a reference data set is demonstrated, which provides individual information on every detected flaw. We discuss the results of measurements in the assembled state with respect to the reference data for flaw detection. KW - X-ray tomography KW - Casting KW - Defects KW - Porosity PY - 2011 U6 - https://doi.org/10.1016/j.ndteint.2011.05.006 SN - 0963-8695 VL - 44 IS - 6 SP - 531 EP - 536 PB - Butterworth-Heinemann CY - Oxford AN - OPUS4-24028 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Staude, Andreas A1 - Goebbels, Jürgen T1 - Determining the Spatial Resolution in Computed Tomography - Comparison of MTF and Line-Pair Structures T2 - International Symposium on Digital Industrial Radiology and Computed Tomography CY - Berlin, Germany DA - 2011-06-20 PY - 2011 AN - OPUS4-23229 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Staude, Andreas A1 - Goebbels, Jürgen T1 - Ortsauflösung in der Computertomographie - Vergleich von MTF und Linienpaarstrukturen T2 - DGZfP Jahrestagung 2011 CY - Bremen, Germany DA - 2011-05-30 PY - 2011 AN - OPUS4-23230 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Staude, Andreas A1 - Goebbels, Jürgen A1 - Ritter, Z. A1 - Prohaska, S. A1 - Friedmann, A. A1 - Hege, H. C. A1 - Felsenberg, D. A1 - Brandt, R. T1 - Osteocytes number and volume in osteoporotic and in healthy bone biopsies analysed using Synchrotron CT: a pilot study T2 - ISB2011 XXIIIrd congress of the International Society of Biomechanics CY - Brussels, Belgium DA - 2011-07-03 PY - 2011 AN - OPUS4-23231 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CHAP A1 - Hilpert, U. A1 - Härtig, F. A1 - Bartscher, M. A1 - Ehrig, Karsten A1 - Staude, Andreas A1 - Goebbels, Jürgen T1 - Messunsicherheit, Kalibrierung und Normale zur zuverlässigen Rückführung der dimensionell messenden Computertomographie (CT) T2 - 4. VDI-Fachtagung Messunsicherheit - Messunsicherheit praxisgerecht bestimmen CY - Erfurt, Deutschland DA - 0208-11-12 PY - 2008 SN - 978-3-98-12624-1-4 IS - Kap. 31 SP - 1 EP - 14 CY - Düsseldorf AN - OPUS4-18600 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Flohr, S. A1 - Brinker, U. A1 - Schramm, A. A1 - Kierdorf, U. A1 - Staude, Andreas A1 - Piek, J. A1 - Jantzen, D. A1 - Hauenstein, K. A1 - Orschiedt, J. T1 - Flint arrowhead embedded in a human humerus from the Bronze Age site in the Tollense valley, Germany - A high-resolution micro-CT study to distinguish antemortem from perimortem projectile trauma to bone N2 - The Bronze Age site in the Tollense valley, Germany, has yielded thousands of human and animal bones and a number of archaeological artifacts. Several of the human bones exhibit blunt and sharp force lesions, and the assemblage has been interpreted as representing victims of a large scale conflict. One of the earliest finds is a human humerus with an embedded flint arrowhead. Alleged signs of healing initially reported for this humerus based on clinical CT imaging were interpreted as evidence of an antemortem lesion. The present study, using micro-CT imaging, revealed that the arrowhead lesion in the humerus, contrary to the previous interpretation, shows no signs of healing. The structure previously assumed to represent a sclerotic margin around the wound canal was shown to actually represent compacted trabecular debris. Thus, our re-analysis of the specimen led to a re-classification of the arrow wound as a perimortem lesion. The findings of the present study demonstrate the value of micro-CT imaging as a non-destructive method for obtaining information on the nature of bone lesions and healing reactions critical for the reconstruction of interpersonal conflict scenarios in the past. KW - Arrow wound KW - Differential diagnosis KW - Prehistoric warfare KW - Antemortem and perimortem lesions KW - Trauma PY - 2015 U6 - https://doi.org/10.1016/j.ijpp.2015.02.004 SN - 1879-9817 VL - 9 SP - 76 EP - 81 PB - Elsevier Inc. AN - OPUS4-32881 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Staude, Andreas T1 - Revealing the inner structure of archeological artefacts non-destructively with X-ray CT T2 - Project group meeting "The Bronze Age battlefield site in the Tollense valley, Mecklenburg-Vorpommern" CY - Schwerin DA - 2015-03-20 PY - 2015 AN - OPUS4-32870 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bruno, Giovanni A1 - Staude, Andreas A1 - Meinel, Dietmar A1 - Hentschel, Manfred P. A1 - Müller, Bernd R. ED - Grellmann, W. ED - Frenz, H. T1 - Moderne bildgebende hochauflösende Röntgenverfahren für die Materialcharakterisierung N2 - Die Computertomographie (CT) ist in der Medizin als Standardtechnik etabliert, in der zerstörungsfreien Prüfung wird sie zunehmend angewendet, in einzelnen Fällen sogar als Referenzverfahren eingesetzt. Gegenwärtig ist eine starke Zunahme von Anwendungen der CT in der Materialcharakterisierung zu verzeichnen. Zudem werden weitere moderne 3D-Techniken für werkstoffwissenschaftliche Fragestellungen genutzt, um die Mikrostruktur - auch in situ (z.B. Druck, Temperatur) - aufzuklären. Hier werden neben der konventionellen Absorptions-CT auch die Potenziale der Refraktions-CT zur Beantwortung prozesstechnischer sowie werkstofflicher Fragestellungen aufgezeigt, die ein „ganzheitliches Bild“ des jeweiligen Werkstoffs zum Ziel haben. T2 - Tagung Werkstoffprüfung 2014 - Fortschritte in der Werkstoffprüfung für Forschung und Praxis - Werkstoffeinsatz, Qualitätssicherung und Schadensanalyse CY - Berlin, Germany DA - 04.12.2014 KW - Computer tomography KW - X-ray refraction KW - Ceramics KW - Concrete KW - Inhomogeneous materials KW - Computertomographie KW - Röntgenrefraktion KW - Keramik KW - Beton KW - Mehrphasige Materialien PY - 2014 SN - 978-3-9814516-8-9 SN - 1861-8154 SP - 1 EP - 12 AN - OPUS4-32565 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Rifai, Haifa A1 - Staude, Andreas A1 - Meinel, Dietmar A1 - Illerhaus, Bernhard A1 - Bruno, Giovanni T1 - In-situ pore size investigations of loaded porous concrete with non-destructive methods N2 - Subject of this investigation is the in-situ evolution of pore volume and pore size distribution in Ytong (a porous concrete material) under increasing pressure with two different non-destructive analytical methods: Nuclear Magnetic Resonance (NMR) and X-ray Computed Tomography (CT). For both methods special strain devices to apply external pressure were constructed. The results from the two techniques yield complementary information on the pore size distribution and allows covering different pore size regions. KW - Pore size KW - Porous concrete KW - Computed tomography KW - Nuclear magnetic resonance PY - 2018 U6 - https://doi.org/10.1016/j.cemconres.2018.06.008 SN - 0008-8846 SN - 1873-3948 VL - 111 SP - 72 EP - 80 PB - Elsevier Ltd. AN - OPUS4-45617 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Scholtz, G. A1 - Staude, Andreas A1 - Dunlop, J.A. T1 - Trilobite compound eyes with crystalline cones and rhabdoms show mandibulate affinities N2 - Most knowledge about the structure, function, and evolution of early compound eyes is based on investigations in trilobites. However, these studies dealt mainly with the cuticular lenses and little was known about internal anatomy. Only recently some data on crystalline cones and retinula cells were reported for a Cambrian trilobite species. Here, we describe internal eye structures of two other trilobite genera. The Ordovician Asaphus sp. reveals preserved crystalline cones situated underneath the cuticular lenses. The same is true for the Devonian species Archegonus (Waribole) warsteinensis, which in addition shows the fine structure of the rhabdom in the retinula cells. These results suggest that an apposition eye with a crystalline cone is ancestral for Trilobita. The overall similarity of trilobite eyes to those of myriapods, crustaceans, and hexapods corroborates views of a phylogenetic position of trilobites in the stem lineage of Mandibulata. KW - Trilobite compound eyes KW - Computed Tomography PY - 2019 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-510784 SN - 2041-1723 VL - 10 SP - 2503 PB - Nature AN - OPUS4-51078 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Helmecke, E. A1 - Fleßner, M. A1 - Kaufmann, M. A1 - Staude, Andreas A1 - Hausotte, T. T1 - Numerical measurement uncertainty determination for dimensional measurements of microparts with CT N2 - Up to now, the only standardized method to determine the measurement uncertainty for computed tomography (CT) is to use calibrated workpieces as specified in the Guideline VDI/VDE 2630 Part 2.1. This paper discusses a promising numerical method for uncertainty determination with help of a virtual metrological CT (VMCT). It gives an explanation of the adjustments, the input parameters and the execution of the simulation. Furthermore, it discusses the first results of uncertainty determination compared to the method of using calibrated workpieces with the aid of two example cases. T2 - 6th Conference on Industrial Computed Tomography (iCT) CY - Wels, Austria DA - 09.02.2016 KW - simulation KW - Simulation KW - Computertomographie KW - Dimensionelle Metrologie KW - Normung KW - numerische Messunsicherheitsbestimmung KW - computed tomography KW - dimensional metrology KW - standardization KW - numerical uncertainty determination PY - 2016 UR - http://www.ndt.net/article/ctc2016/papers/ICT2016_paper_id17.pdf SP - Paper ID17, 1 EP - 7 AN - OPUS4-35481 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - di Matteo, G. A1 - Staude, Andreas A1 - Kuhn, R. A1 - Hertel, I. A1 - Seyfried, F. A1 - Reiche, I. ED - Reiche, I. T1 - Investigation of Ancient Egyptian Metallic Artefacts by Means of Micro-Computed Tomography N2 - In this paper we present the results of imaging studies of ancient Egyptian metallic artifacts using micro-Computed Tomography (micro-CT). Micro-CT is a non-destructive imaging method with high spatial resolution, which enables the examination of the internal structure of objects. It is thus especially suitable for the investigation of cultural heritage and archaeological findings, when it is not possible to sample or difficult to manipulate the object. Using specialized software for 3D visualization and segmentation, data sets of two objects were analyzed. We gained a clear view of the inner structure of a metallic archaeological artifact from the necropolis of Abusir el-Meleq, which is believed to be very ancient in the Egyptian archaeological context (from the Predynastic Era), and were able to distinguish its different omponents under the thick layers of external concretions. These components give hints about the production technology of the object. We also investigated the contents of a closed metal box found near Abusir dated to the Late/Greco-Roman Period. The identified Content corresponds either to sediments or to mineral remains of the original content of the box. Both artifacts are from excavations conducted in Egypt and are part of the archeological collection of the Ägyptisches Museum und Papyrussammlung in Berlin. KW - Computertomographie KW - computed tomography KW - Archäologie KW - archaeology KW - Metall KW - metal PY - 2015 SN - 0344-5089 VL - 23 SP - 79 EP - 84 CY - Berlin AN - OPUS4-35432 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Staude, Andreas A1 - Scholtz, G. A1 - Dunlop, J. A. T1 - Trilobite compound eyes with crystalline cones and rhabdoms show mandibulate affinities N2 - Most knowledge about the structure, function, and evolution of early compound eyes is based on investigations in trilobites. However, these studies dealt mainly with the cuticular lenses and little was known about internal anatomy. Only recently some data on crystalline cones and retinula cells were reported for a Cambrian trilobite species. Here, we describe internal eye structures of two other trilobite genera. The Ordovician Asaphus sp. reveals preserved crystalline cones situated underneath the cuticular lenses. The same is true for the Devonian species Archegonus (Waribole) warsteinensis, which in addition shows the fine structure of the rhabdom in the retinula cells. These results suggest that an apposition eye with a crystalline cone is ancestral for Trilobita. The overall similarity of trilobite eyes to those of myriapods, crustaceans, and hexapods corroborates views of a phylogenetic position of trilobites in the stem lineage of Mandibulata. KW - Coputed tomography KW - Crystalline cones PY - 2019 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-483889 SN - 2041-1723 VL - 10 SP - 2503, 1 EP - 7 PB - Nature AN - OPUS4-48388 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Müller, Bernd R. A1 - Cooper, R.C. A1 - Lange, Axel A1 - Kupsch, Andreas A1 - Wheeler, M. A1 - Hentschel, Manfred P. A1 - Staude, Andreas A1 - Pandey, A. A1 - Shyam, A. A1 - Bruno, Giovanni T1 - Stress-induced microcrack density evolution in β-eucryptite ceramics: Experimental observations and possible route to strain hardening N2 - In order to investigate their microcracking behaviour, the microstructures of several β-eucryptite ceramics, obtained from glass precursor and cerammed to yield different grain sizes and microcrack densities, were characterized by laboratory and synchrotron x-ray refraction and tomography. Results were compared with those obtained from scanning electron microscopy (SEM). In SEM images, the characterized materials appeared fully dense but computed tomography showed the presence of pore clusters. Uniaxial tensile testing was performed on specimens while strain maps were recorded and analyzed by Digital Image Correlation (DIC). X-ray refraction techniques were applied on specimens before and after tensile testing to measure the amount of the internal specific surface (i.e., area per unit volume). X-ray refraction revealed that (a) the small grain size (SGS) material contained a large specific surface, originating from the grain boundaries and the interfaces of TiO2 precipitates; (b) the medium (MGS) and large grain size (LGS) materials possessed higher amounts of specific surface compared to SGS material due to microcracks, which decreased after tensile loading; (c) the precursor glass had negligible internal surface. The unexpected decrease in the internal surface of MGS and LGS after tensile testing is explained by the presence of compressive regions in the DIC strain maps and further by theoretical arguments. It is suggested that while some microcracks merge via propagation, more close mechanically, thereby explaining the observed X-ray refraction results. The mechanisms proposed would allow the development of a strain hardening route in ceramics. KW - Beta-eucryptite KW - Microcracked ceramics KW - X-ray refraction KW - Tensile load KW - Strain hardening KW - Synchrotron KW - BAMline KW - Computed Tomography KW - CT PY - 2018 UR - http://www.sciencedirect.com/science/article/pii/S1359645417308881 U6 - https://doi.org/10.1016/j.actamat.2017.10.030 SN - 1359-6454 SN - 1873-2453 VL - 144 IS - Supplement C SP - 627 EP - 641 PB - Elsevier B.V. AN - OPUS4-43024 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -