TY - CONF A1 - Philipp, Rosemarie A1 - Lalere, B. A1 - Gantois, F. T1 - EMPIR project ALCOREF - certified forensic alcohol reference materials N2 - The talk presents a short summary of the EMPIR Project ALCOREF "Certified forensic alcohol reference materials". An interlaboratory comparison of analytical methods for the quantification of ethanol in water and a comparison of certified ethanol in water reference materials are proposed. T2 - EURAMET SCOA Meeting CY - Brno, Czech Republic DA - 05.02.2019 KW - Breath alcohol analyser KW - Certified reference material KW - Interlaboratory comparison PY - 2019 AN - OPUS4-47333 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zscherpel, Uwe T1 - Image Quality in Industrial Radiology N2 - Overview on Concepts and Methodology used for quality ensurance in industrial radiology. The past, present and future. T2 - General Assembly of Academia NDT International CY - Brescia, Italy DA - 12.10.2018 KW - Image quality KW - Computed radiography (CR) KW - Digital Detector Array (DDA) KW - Film radiography PY - 2018 AN - OPUS4-47347 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Ewert, Uwe A1 - Zscherpel, Uwe A1 - Vogel, Justus A1 - Zhang, F. A1 - Long, N.X. A1 - Nguyen, T.P. T1 - Visibility of Image Quality Indicators (IQI) by Human Observers in Digital Radiography in Dependence on Measured MTFs and Noise Power Spectra N2 - Digital radiographic images were analysed to predict the visibility of image quality indicators (IQI), based on normalized noise power spectra (NNPP) and modulation transfer function (MTF) measurements. The fixed pattern noise of some digital detectors result in different noise spectra, which influence the visibility of different IQIs, depending on the hole diameter. Studies, based on measurement of basic spatial resolution and contrast to noise ratio were performed together with presampled MTF measurements and the NNPS in dependence on the spatial frequency. Plate hole IQIs, step hole IQIs, and equivalent penetrameter sensitivity (EPS) IQIs based on ASTM E 746 were measured to verify the influence of the different parameters. Modelling of digital images was used to verify the applied numeric tools. A study has been performed for imaging plates and digital detector arrays to analyse differences. Formulas for the prediction of the visibility functions for hole type IQIs are derived. In consequence the standards for characterization and classification of computed radiography (ASTM E 2446) and radiography with DDAs (ASTM E 2597) need to be revised. T2 - 12th ECNDT 2018 CY - Gothenburg, Sweden DA - 11.06.2018 KW - Image evaluation KW - Computed radiography (CR) KW - Digital Detector Array (DDA) KW - Detail detection PY - 2018 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-473486 UR - www.ndt.net/?id=22967 SN - 1435-4934 VL - 23 IS - 8 SP - 1 EP - 7 PB - NDT.net CY - Kirchwald AN - OPUS4-47348 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zscherpel, Uwe A1 - Ewert, Uwe T1 - Optimum Magnification Factor in Digital Radiography - Selection Criteria and Formulas N2 - The transition from X-ray film to digital detectors in radiography is accompanied by an increase of unsharpness due to the larger inherent digital detector unsharpness in comparison to film. The basic spatial resolution of digital detectors (see EN ISO 17636-2) is used today to describe this unsharpness. The geometrical unsharpness of the radiographic projection of object structures onto the detector plane is determined by the focal spot size of the X-ray tube and the magnification. The focal spot size is measured today (see ASTM E 1165) from pin hole camera exposures or edge unsharpness (see ASTM E 2903). The final image unsharpness is a result of a convolution of the geometrical and inherent detector unsharpness function, divided by the magnification factor of the object onto the detector plane. Different approximations of this convolution result in ASTM E 1000 and ISO 17636-2 in different optimum values for the magnification factor for a given focal spot size of a X—ray tube and the basic spatial resolution of the detector. The higher contrast sensitivity, an advantage of digital radiography, compared to film radiography is furthermore improved when using higher X-ray voltages as used with film and smaller focal spots of the X-ray tubes. This allows a higher distance between object and detector resulting in reduced object scatter in the image. The interactions between all these parameters will be discussed and simple rules for practitioners will be derived in this contribution. T2 - 12th ECNDT 2018 CY - Gothenburg, Sweden DA - 11.06.2018 KW - Digital Radiology KW - Image unsharpness KW - Optimum magnification PY - 2018 AN - OPUS4-47351 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zscherpel, Uwe A1 - Ewert, Uwe T1 - Annual Report of Sub-Commission V-A "Radiography-based weld inspection" N2 - A Summary pf the activities of the IIW sub-commission V-A in 2018 for radiographic weld inspection. T2 - Annual Assembly of IIW CY - Bali, Indonesia DA - 15.07.2018 KW - Radiograpgy KW - Weld Inspection KW - International Institute of Welding PY - 2018 AN - OPUS4-47355 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zscherpel, Uwe A1 - Stegemann, Robert T1 - Update on Revision of ISO 24497 - NDT - MMM - Technique N2 - Presentation of the final compromise reached in 2018 for revision of ISO 24497, final draft for voting at ISO can be prepared now. T2 - IIW Annual Assembly 2018 CY - Bali, Indonesia DA - 15.07.2018 KW - NDT - Metal Magnetic Memory KW - Revision of ISO 24497 KW - New ISO draft PY - 2018 AN - OPUS4-47356 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Lemke, Nora A1 - El-Khatib, Ahmed A1 - Theuring, F. A1 - Jakubowski, Norbert A1 - Vogl, Jochen T1 - Development of a method for protein quantification via isotope dilution ICP-MS for application on an Alzheimer’s biomarker N2 - Inductively coupled plasma mass spectrometry (ICP-MS) is a powerful method for the matrix-independent quantitative analysis of target elements. Developed for the use in inorganic trace analysis, ICP-MS is nowadays emerging as a valuable tool for bioanalytical questions. Especially the use of ICP-MS for quantitative proteomics by measuring heteroatoms has gained popularity in the last decade, considering that established quantification methods like organic mass spectrometry depend on the existence of matched protein and peptide standards or labelling of the target protein. The need for reliable quantification of proteins is constantly growing, but only a limited number of well characterized and quantified protein standards are available so far. Not only in basic research, but also in a clinical context, accurately quantified, traceable protein standards are needed to ensure comparability of measurements between laboratories. One disease with a major impact on our ageing society is Alzheimer’s disease (AD), which is still challenging to diagnose. As this is also due to a lack in comparability and accuracy of existing biomarker assays, the community would greatly benefit from well quantified protein biomarker standards. In this work, we applied isotope dilution analysis (IDA) using ICP-MS to quantify proteins of known stoichiometry via their sulfur content. Sulfur is present in two amino acids, cysteine and methionine, and hence exists in nearly all proteins. Simple strategies were employed for the detection of low molecular sulfur species to correct for sulfur contaminants and allow for reliable quantification of various proteins. We report the protein mass fractions with expanded uncertainties of a standard reference material and commercially available proteins determined by sulfur IDA. The herein developed method can be applied for the reliable and traceable quantification of pure proteins and will be used for the quantification of an AD biomarker. Our target is the tau protein, as brain load and distribution of tau is highly correlated with the clinical progression of AD. T2 - ReMiND 2019 Biomolecules in Neurodegenerative Diseases CY - Braunschweig, Germany DA - 26.06.2019 KW - ICP-MS KW - Isotope dilution KW - Proteins KW - Quantification PY - 2019 AN - OPUS4-48464 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bonnerot, Olivier A1 - Bosch, S. A1 - Rabin, Ira A1 - Hahn, Oliver T1 - Scientific service project z02 at the CSMC: material science methods of reconstructing the history of manuscripts N2 - Z02 is one of the three technically supporting projects at the Centre for the Study of Manuscript Cultures (CSMC). In collaboration with the other two service projects, Z01 and Z03, it aims at bridging the gap between humanities and natural sciences and technology. To that purpose, we set up a laboratory with a range of high-end instruments, most of them mobile, allowing thorough non-destructive analysis of manuscripts. In addition to working on constantly improving the laboratory and the methods of analysis, a substantial part of our activities is dedicated to service, by supporting different research projects conducted at the centre. In this talk, we will present our equipment and the possibilities offered by the different techniques available regarding the different kinds of missions: typology and classification of inks, provenance studies, recovery of faded inscriptions and palimpsests, reconstruction of the history of manuscripts, authentication and dating. We will give a brief overview of our past and ongoing activities in the frame of the second phase of the CSMC. Finally, a selection of three projects will be presented in greater detail to highlight the possibilities of our laboratory and the diversity of missions which can be carried out. T2 - International Medieval Conference CY - Leeds, United Kingdom DA - 01.07.2019 KW - Manuscript KW - Ink KW - Pigment PY - 2019 AN - OPUS4-48465 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Duwe, M. A1 - Fischer, Daniel A1 - Quast, J.-H. A1 - Schneider, S. A1 - Beck, Uwe T1 - Curved-surface metrology by imaging Mueller-matrix ellipsometry N2 - Outline - maging ellipsometry: oncept and setup - Basic theory: ellipsometry on tilted/curved surfaces - Geometric considerations - Tilt-induced cross-polarization - Application: coating analysis on microlensarray - Mueller-Matrix Imaging - Conversion to Delta-Psi Image - Layer-thickness of ITO coating T2 - 8th International conference on spectroscopic CY - Barcelona, Spain DA - 26.05.2019 KW - Spectroscopic Imaging KW - Mueller-Matrix Ellipsometry KW - Curved surfaces PY - 2019 AN - OPUS4-48366 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Ghasem Zadeh Khorasani, Media A1 - Elert, Anna Maria A1 - Hodoroaba, Vasile-Dan A1 - Agudo Jácome, Leonardo A1 - Altmann, Korinna A1 - Silbernagl, Dorothee A1 - Sturm, Heinz T1 - Short- and long-range mechanical and chemical interphases caused by interaction of Boehmite (γ-AlOOH) with anhydride-cured epoxy resins N2 - Understanding the interaction between boehmite and epoxy and the formation of their interphases with different mechanical and chemical structures is crucial to predict and optimize the properties of epoxy-boehmite nanocomposites. Probing the interfacial properties with atomic force microscopy (AFM)-based methods, especially particle-matrix long-range interactions, is challenging. This is due to size limitations of various analytical methods in resolving nanoparticles and their interphases, the overlap of interphases, and the effect of buried particles that prevent the accurate interphase property measurement. Here, we develop a layered model system in which the epoxy is cured in contact with a thin layer of hydrothermally synthesized boehmite. Different microscopy methods are employed to evaluate the interfacial properties. With intermodulation atomic force microscopy (ImAFM) and amplitude dependence force spectroscopy (ADFS), which contain information about stiffness, electrostatic, and van der Waals forces, a soft interphase was detected between the epoxy and boehmite. Surface potential maps obtained by scanning Kelvin probe microscopy (SKPM) revealed another interphase about one order of magnitude larger than the mechanical interphase. The AFM-infrared spectroscopy (AFM-IR) technique reveals that the soft interphase consists of unreacted curing agent. The long-range electrical interphase is attributed to the chemical alteration of the bulk epoxy and the formation of new absorption bands. KW - Nanocomposites KW - Interphase KW - Intermodulation AFM KW - Electron microscopy KW - Infrared nano AFM PY - 2019 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-483672 UR - https://www.mdpi.com/2079-4991/9/6/853/htm DO - https://doi.org/10.3390/nano9060853 SN - 2079-4991 VL - 9 IS - 6 SP - 853, 1 EP - 20 PB - MDPI AN - OPUS4-48367 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Munsch, Sarah Mandy A1 - Strangfeld, Christoph A1 - Kruschwitz, Sabine ED - Kärger, J. ED - Heitjans, P. T1 - Determining the pore size distribution in synthetic and building materials using 1D NMR N2 - NMR is gaining increasing interest in civil engineering applications for the use of microstructure characterization as e.g. pore size determination and monitoring of moisture transport in porous materials. In this study, the use of NMR as a tool for pore size characterization was investigated. For our study we used screed and synthetic materials at partial and full saturation. A successful determination could be achieved when having a reference or calibration method, although partly diffusion effects have been registered. Due to these diffusion effects, for the determination of pore size distributions of synthetic materials another NMR device was needed. Finally, the determination of the surface relaxivity of screed (50 μm/s) led to a higher value than first expected from literature. T2 - 14th International Bologna Conference on Magnetic Resonance in Porous Media CY - Gainesville, FL, USA DA - 18.02.2018 KW - NMR relaxometry KW - Pore size distribution KW - Building materials KW - Porous materials KW - Surface relaxivity PY - 2019 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-483680 UR - https://diffusion.uni-leipzig.de/pdf/volume31/diff_fund_31(2019)02.pdf SN - 1862-4138 N1 - Geburtsname von Munsch, Sarah Mandy: Nagel, S. M. - Birth name of Munsch, Sarah Mandy: Nagel, S. M. VL - 31 IS - 2 SP - 1 EP - 9 PB - University of Leipzig CY - Leipzig AN - OPUS4-48368 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Lugovtsova, Yevgeniya A1 - Bulling, Jannis A1 - Prager, Jens T1 - Fantastic guided modes and how to find them N2 - Ultrasonic guided waves (UGW) have been shown to be suitable for non-destructive testing (NDT) and structural health monitoring (SHM) of many engineering structures. Development of a technique based on UGWs requires careful understanding obtained through modelling and analysis of wave propagation and mode-damage interaction due to their dispersion and multimodal character. This presentation will provide insights into the Scaled Boundary Finite Element Method and its applicability for tackling wave propagation problems. Features and limitations of the SBFEM will be presented on an example of a multi-layered plate structure consisting of isotropic and anisotropic materials bonded together. You will be guided through the process of picking up the wave modes for your application. Starting from the calculation of dispersion curves and mode shapes to the analysis of wave propagation and mode-damage interaction. The main highlight of the presentation lies in the ability to detect damage in a certain layer depending on the mode used. The resulting deeper understanding of the wave propagation in multi-layered structures is the key to further developments of NDT and SHM for engineering structures consisting of multiple layers. T2 - Von CEA Eingeladener Vortrag CY - Saclay, France DA - 07.06.2019 KW - Structural Health Monitoring KW - Pressure tanks KW - Hydrogen storage KW - Natural gas KW - Composites KW - Scaled Boundary Finite Element Method PY - 2019 AN - OPUS4-48375 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bulletti, A. A1 - Capineri, L. A1 - Lugovtsova, Yevgeniya A1 - Prager, Jens T1 - Charachterization of piezopolymer interdigital transducer's vibrational modes N2 - Lamb waves are widely used for monitoring the health of structures made of laminated materials (metals, composites). Piezoelectric ultrasonic transducers transmit and receive acoustic guided waves that interact with the elastic properties and the defects of the material under test. In recent years, DINFO developed piezopolymer Interdigital Transducers (IDTs) proven to be suitable to build SHM systems for aerospace applications. Their base material is a Cr/Au-coated PVDF-TrFE copolymer sheet, having a thickness of 100μm and a metallization of 0.1μm on both sides. IDTs are attractive for SHM systems for their capability to select specific Lamb wave modes when designed with appropriate electrode pattern. For a reliable application, it is crucial to characterize the in-plane and out-of-plane displacement of the transducer and to correlate the ultrasonic propagating signal with the Lamb waves dispersion curves in laminates. For example, for a 2 mm aluminum plate A0 mode has dominant out-of-plane displacement, whereas S0 mode has dominant in-plane displacement at the plate's surface. In collaboration with BAM the characterization of free vibrational modes using a 3D laser doppler vibrometer was performed. The analysis in the frequency domain was performed using the following parameters: a chirp excitation with frequencies 50-500 kHz and 0.5-1 MHz with 195 Hz and 390 Hz frequency resolution respectively at 100 Vpp for a total of 90 averaged measurements per point. Also propagating modes were characterized by bonding the IDT on a 2 mm aluminum plate and analyzing the in-plane and the out-of-plane components. A0-mode was successfully excited having the main lobe aligned with the main axis of the IDT, confirming the dominant presence of this propagating mode. The results could be used as a basis for design and optimization of the IDTs in terms of directivity and mode selection, and to facilitate interpretation of the ultrasonic guided waves propagating in laminated structures. T2 - 51th Annual Meeting of the Associazione Societa Italiana Di Elettronica CY - Rome, Italy DA - 26.06.2019 KW - Structural Health Monitoring KW - Interdigital Transducer KW - PVDF KW - Ultrasonic guided waves KW - Lamb waves PY - 2019 AN - OPUS4-48382 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Musnier, B. A1 - Wegner, Karl David A1 - Comby-Zerbino, C. A1 - Trouillet, V. A1 - Jourdan, M. A1 - Häusler, I. A1 - Antoine, R. A1 - Coll, J.-L. A1 - Resch-Genger, Ute A1 - Le Guevel, X. T1 - High photoluminescence of shortwave infrared-emitting anisotropic surface charged gold nanoclusters N2 - Incorporating anisotropic surface charges on atomically precise gold nanoclusters (Au NCs) led to a strong absorption in the nearinfrared region and could enable the formation of self-assembled Au NCs xhibiting an intense absorption band at ∼1000 nm. This surface modification showed a striking enhancement of the photoluminescence in the Shortwave Infrared (SWIR) region with a quantum yield as high as 6.1% in water. KW - Gold nanoclusters KW - SWIR photoluminescence KW - Self-assembly PY - 2019 DO - https://doi.org/10.1039/C9NR04120F VL - 11 IS - 25 SP - 12092 EP - 12096 PB - Royal Society of Chemistry AN - OPUS4-48305 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Beck, Uwe A1 - Hielscher-Hofinger, Stefan A1 - Lange, Thorid A1 - Stockmann, Jörg M. A1 - Weise, Matthias A1 - Rietz, U. A1 - Lerche, D. T1 - Centrifugal force meets materials testing – analytical centrifuge as multipurpose tool for tensile and compressive stress testing N2 - Up until several years ago, tensile and compressive tests have been exclusively carried out as single-sample tests within a tensile, hardness or universal testing machine. The availability of centrifuge technology changed this situation in 2013 in several ways because centrifugal force is used as testing force within a rotational reference frame. Firstly, multiple-sample strength testing became feasible for both tensile load condi-tions, e.g. determination of composite, bonding or adhesive strength, and compressive load conditions, e.g. hardness, compressibility and compactibility. Secondly, there is no need for a two-sided sample clamping and double-cardanic suspensions as samples are simply inserted using a one-sided sample support. Thirdly, shear forces can be avoided by means of guiding sleeves which steer test stamps acting as mass bodies for either tensile or compressive testing. Fourthly, up to eight samples can be tested under identical conditions within a very short period of time, typically within 15 minutes including sample loading and unloading. Hence, either a reliable statistics (of identical samples) or a ranking (of different samples) can be derived from one test run. The bench-top test system is described in detail and demonstrated that centrifugal force acts as testing force in an appropriate way because Euler and Coriolis force do not affect the testing results. Examples for both tensile strength testing, i.e. bonding strength of adhesives-bonded joints and adhesive strength of coatings, and compres-sive strength testing, i.e. Vickers-, Brinell- and ball indentation hardness and deter-mination of spring constants, are presented, discussed and compared with conven-tional tests within tensile, hardness or universal testing machines. At present, a maximum testing force of 6.5 kN can be realized which results at test stamp diameters of 5 mm, 7 mm, and 10 mm in tensile or compressive stress values of 80 MPa, 160 MPa, and 320 MPa. For tensile strength, this is already beyond bonding strength of cold- and warm-curing adhesives. Moreover, centrifuge technology is compliant to standards such as EN 15870, EN ISO 4624, EN ISO 6506/6507 and VDI/VDE 2616. Programmable test cycles allow both short-term stress and log-term fatigue tests. Based on a variety of examples of surface and bonding technology, applications in both fields R&D and QC are presented. Meanwhile, centrifuge technology is also accredited according to DIN EN ISO/IEC 17025. T2 - Intermationa Conference Dispersion Analysis & Materials Testing CY - Berlin, Germany DA - 22.05.2019 KW - Centrifugal Force KW - Compressive Stress KW - Tensile Stress PY - 2019 AN - OPUS4-48310 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rhode, Michael A1 - Kannengießer, Thomas A1 - Schaupp, Thomas A1 - Mente, Tobias T1 - Hydrogen in weld joints - An underestimated risk? - Utilization potential of gas analytics versus safety of welded components N2 - Hydrogen was once called “the versatile embrittler” [1], which summarizes very well the effect on reduction of ductility and/or toughness in technical alloys like steel. In that connection, welding is one of the most important component fabrication technologies. During welding, hydrogen can be transferred to the weld pool from manifold sources (like contaminations, residuals at the surface, etc.). As hydrogen embrittles a material, the safety of welded components with hydrogen is always a critical issue. Weld heat input causes additional changes in the microstructure like grain growth or partial dissolution of precipitates and many more. All these things influence the mechanical properties and also represent hydrogen traps. These traps decrease the hydrogen diffusion compared to the ideal lattice. The result can be so-called delayed hydrogen assisted cracking (HAC) of the weld joint due to the significantly decreased diffusivity by trapped hydrogen. This is often an underestimated risk as those cracks can appear in the weld joint even after some days! It is essential to know about hydrogen ingress during welding and the microstructure specific hydrogen diffusion. Both are depended on weld parameter influence and the chemical composition of the base material and weld metal. For that purpose, gas analytic methods like solid-state carrier gas hot extraction (CGHE) are useful tools to: (1) identify detrimental hydrogen concentrations from weld joints, (2) binding energies from hydrogen traps by thermal desorption analysis or (3) high-temperature diffusion coefficients. Those values are extremely important for welding practice in terms of recommendations on realistic hydrogen removal heat treatment (HRHT) after welding. Considering the increasing use of “digital” experiments, the data is also needed for reliable numerical simulations of HAC process or HRHT-effectiveness. The present contribution gives an overview on the influence of hydrogen on weld joints, the necessity, methods and standards for hydrogen determination (CGHE) with the aim of fabrication of safe welded and crack-free components. [1] R. A. Oriani (1987), Corrosion 43(7):390-397. doi: 10.5006/1.3583875 T2 - 20. Tagung Festkörperanalyse - FKA20 CY - Vienna, Austria DA - 01.07.2019 KW - Hydrogen KW - Welding KW - Gas analytic PY - 2019 AN - OPUS4-48402 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bellon, Carsten T1 - Virtual CT with Complex scanning trajectories in aRTist N2 - The simulator aRTist combines analytical and Monte Carlo methods to efficiently model the radiographic process of industrial radiology. In this contribution we focus on virtual computer tomography, the simulation of tomographic scans. The possibilities to simulate complex scanning trajectories are shown in combination with the tomographic reconstruction using individual projection matrices. T2 - The 4th Annual Advances in X-Ray Imaging Workshop CY - Diamond Light Source, Didcot, UK DA - 11.06.2019 KW - X-ray Computer-tomography simulation PY - 2019 AN - OPUS4-48297 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Jaenisch, Gerd-Rüdiger A1 - Waske, Anja A1 - Ewert, U. A1 - Bircher, B. A1 - Korpelainen, V. A1 - Costin, M. A1 - Yang, F. A1 - Hörauf, F. A1 - Steffen, J. P. A1 - Dai, G. A1 - Deresch, A. A1 - Graf vom Hagen, C. T1 - EMPIR Project NanoXSpot N2 - The overall objective of project NanoXSpot (Nanometre X-ray Focal Spot Measurement) is to develop traceable measurement methods for determining the focal spot size, shape, and position of nanometre resolution X-ray tubes. The impact of the technical results will be ensured by preparing prenormative documents for submission to CEN TC 138 (Non-destructive testing) WG 1 (Radiographic testing), which directly addresses the research needs of CEN, currently revising standards in the series 12543 for focal spot measurements below 5 µm spot size to harmonise standards and measurement method between ASTM and CEN. T2 - DACH-Tagung CY - Friedrichshafen, Germany DA - 27.05.2019 KW - Standardization KW - X-Ray tube KW - Focal spot measurement PY - 2019 AN - OPUS4-48298 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Vahlsing, Thorsten A1 - Raum, Hanne A1 - Casperson, Ralf A1 - Pohl, Rainer A1 - Heckel, Thomas A1 - Beilken, D. A1 - Dilz, K. A1 - Rühe, S. T1 - FE-simulation of eddy current signals produced from basic model cracks for running surface rail defects N2 - Non-destructive testing for surface crack detection and head check depth quantification at the gauge corner of railway tracks can be achieved using eddy current methods. With the extension of the tested zone to the running surface, rail defect signal types other than head checks can be measured. Due to their mostly irregular shape, a quantitation based on a calibration against regular test cracks of varying depth may not be linear. Estimates of the expected influence of more complex crack patterns may be obtained by a finite element simulation of sufficiently simple limiting cases, like two displaced or intersecting cracks or a simply branched or flexed crack. As a first step, a 3D finite element model of the HC10 eddy current probe distributed by Prüftechnik Linke und Rühe (PLR), Germany was built and verified against measured results from an (easily fabricated) reference block with isolated long cracks. T2 - 15th Railway Engineering Conference CY - Edinburgh, UK DA - 03.07.2019 KW - Finite element analysis KW - Eddy current testing KW - Rail inspection PY - 2019 SP - 1 EP - 11 AN - OPUS4-48529 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Heckel, Thomas A1 - Vahlsing, Thorsten A1 - Raum, Hanne A1 - Casperson, Ralf A1 - Pohl, Rainer A1 - Heckel, Thomas A1 - Beilken, D. A1 - Dilz, K. A1 - Rühe, S. T1 - FE-simulation of eddy current signals produced from basic model cracks for running surface rail defects N2 - Non-destructive testing for surface crack detection and head check depth quantification at the gauge corner of railway tracks can be achieved using eddy current methods. With the extension of the tested zone to the running surface, rail defect signal types other than head checks can be measured. Due to their mostly irregular shape, a quantitation based on a calibration against regular test cracks of varying depth may not be linear. Estimates of the expected influence of more complex crack patterns may be obtained by a finite element simulation of sufficiently simple limiting cases, like two displaced or intersecting cracks or a simply branched or flexed crack. As a first step, a 3D finite element model of the HC10 eddy current probe distributed by Prüftechnik Linke und Rühe (PLR), Germany was built and verified against measured results from an (easily fabricated) reference block with isolated long cracks. T2 - Railway Engineering 2019 CY - Edinburgh, UK DA - 03.07.2019 KW - Finite element analysis KW - Eddy current testing KW - Rail inspection PY - 2019 AN - OPUS4-48530 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -