TY - JOUR A1 - Maierhofer, Christiane A1 - Brink, Arne A1 - Röllig, Mathias A1 - Wiggenhauser, Herbert T1 - Transient thermography for structural investigation of concrete and composites in the near surface region JF - Infrared physics & technology KW - Impulse thermography KW - Non-destructive testing KW - Quantitative analysis KW - Concrete KW - Composites KW - Civil engineering KW - Simulation KW - Finite differences PY - 2002 SN - 1350-4495 VL - 43 SP - 271 EP - 278 PB - Pergamon Press CY - Oxford AN - OPUS4-1759 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Brink, Arne A1 - Wedler, Gerd A1 - Maierhofer, Christiane A1 - Röllig, Mathias A1 - Weritz, Friederike A1 - Wiggenhauser, Herbert T1 - Active infrared thermography in civil engineering - quantitative analysis by numerical simulation T2 - International Symposium Non-Destructive Testing in Civil Engineering (NDT-CE) N2 - The cooling-down process of building structures after heating-up with an external radiation source was analysed to detect voids inside and below the surface. Quantitative results of concrete test specimen containing voids with different sizes at various depths will be presented here. The experimental results were compared to numerical simulations performed with a Finite Difference program developed at BAM. T2 - 6th International Symposium Non-Destructive Testing in Civil Engineering (NDT-CE) CY - Berlin, Germany DA - 2003-09-16 KW - Non-destructive testing in civil engineering KW - Acitve thermography KW - Concrete KW - Voids KW - Numerical SImulation KW - Finite differences PY - 2003 UR - http://www.ndt.net/article/ndtce03/papers/p024/p024.htm SN - 3-931381-49-8 SP - 1 EP - 8(?) PB - DGZfP CY - Berlin AN - OPUS4-3403 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Kühnemund, Lutz A1 - Kautek, Wolfgang A1 - Röllig, Mathias ED - Plieth, W. T1 - Pulse Laser Depassivation at 532 nm of Titanium in NaCl Electrolytes T2 - Metalle in der Elektrochemie T2 - Jahrestagung. Gesellschaft Deutscher Chemiker, Fachgruppe Angewandte Elektrochemie CY - Freiberg, Germany DA - 1999-09-29 KW - Pulsed-Laser-Depassivated Titanium PY - 2000 SN - 3-924763-85-2 N1 - Serientitel: GDCh-Monographien – Series title: GDCh-Monographien IS - 18 SP - 117 EP - 124 PB - Ges. Deutscher Chemiker CY - Frankfurt am Main AN - OPUS4-842 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Brink, Arne A1 - Maierhofer, Christiane A1 - Röllig, Mathias A1 - Wiggenhauser, Herbert ED - Balageas, D. T1 - Application of quantitative impulse thermography for structural evaluation in civil engineering - comparison of experimental results and numerical simulations T2 - Quantitative infraRed thermography 6 T2 - 6th International Conference on Quantitative InfraRed Thermography ; 6th QIRT '02 CY - Dubrovnik, Croatia DA - 2002-09-24 PY - 2002 SN - 953-631350-2 SP - 35 EP - 40 PB - FSB CY - Zagreb AN - OPUS4-1822 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Maierhofer, Christiane A1 - Brink, Arne A1 - Röllig, Mathias A1 - Wiggenhauser, Herbert T1 - Anwendung der Impuls-Thermografie als quantitatives zerstörungsfreies Prüfverfahren im Bauwesen T2 - ZfP in Anwendung, Entwicklung und Forschung - Jahrestagung 2002 N2 - Zusammenfassung Die Impuls-Thermografie ist eine aktive Methode zur Strukturuntersuchung von Bauteilen. Im Rahmen eines von der DFG geförderten Projektes wird in Kooperation mit der TU Berlin an der Bundesanstalt für Materialforschung und -prüfung zur Zeit die mögliche Anwendung der Impuls-Thermografie als zerstörungsfreies Prüfverfahren im Bauwesen untersucht. Die Impuls-Thermografie soll zur Ortung von oberflächennahen Inhomogenitäten, bei denen es sich im Normalfall um Fehlstellen handelt, in typischen Bauteilen verwendet werden und nach Möglichkeit die Geometrie- sowie die Materialparameter der Inhomogenitäten quantitativ bestimmt werden. Messungen werden derart durchgeführt, dass Oberflächen mit einem geeigneten Heizstrahler erwärmt, die anschließenden Abkühlungsprozesse mit einer Infrarot-Kamera betrachtet und thermische Bilddaten (Thermogramme) aufgezeichnet werden. Der Hauptansatzpunkt für die quantitative Auswertung der Messdaten ist die Betrachtung von Temperatur-Zeit-Kurven (Transienten) des Abkühlungsprozesses über fehlerfreien und fehlerhaften Bereichen des Probekörpers. Zusätzlich werden auf Basis der Finiten-Differenzen-Methode numerische Simulationen durchgeführt. Quantitative Ergebnisse werden sowohl durch den Vergleich der experimentellen Daten mit den Simulationsrechnungen als auch durch eine Anpassung analytischer Funktionen an die Transienten erzielt. T2 - Jahrestagung Zerstörungsfreie Materialprüfung 2002 CY - Weimar, Deutschland DA - 2002-05-06 KW - Zerstörungsfreie Prüfung im Bauwesen (ZfPBau) KW - Impuls-Thermografie KW - Hohlstellen KW - Schichtablösungen KW - Beton PY - 2002 UR - http://www.ndt.net/article/dgzfp02/papers/v45/v45.htm SN - 3-931381-39-0 N1 - Serientitel: Berichtsband / Deutsche Gesellschaft für zerstörungsfreie Prüfung e. V. – Series title: Berichtsband / Deutsche Gesellschaft für zerstörungsfreie Prüfung e. V. IS - 80-CD PB - DGZfP CY - Berlin AN - OPUS4-1824 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Maierhofer, Christiane A1 - Brink, Arne A1 - Röllig, Mathias A1 - Wiggenhauser, Herbert A1 - Hillemeier, B. A1 - Rieck, C. ED - Kupfer, K. ED - Trinks, E. T1 - Untersuchung des Einflusses von Feuchtigkeit auf die Ortung von Hohlstellen in Betonstrukturen mit der Impuls-Thermografie T2 - Feuchtemessung - ein vielfältiges Problem mit großen Perspektiven T2 - 11. Feuchtetag CY - Weimar, Deutschland DA - 2002-09-18 KW - Impuls-Thermografie KW - Thermografie KW - Zerstörungsfreie Prüfung im Bauwesen KW - Simulation KW - Hohlstellen KW - Kiesnester KW - Feuchtigkeit KW - Beton PY - 2002 SP - 47 EP - 58 PB - MFPA an der Bauhaus-Univ. CY - Weimar AN - OPUS4-1827 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Maierhofer, Christiane A1 - Brink, Arne A1 - Röllig, Mathias A1 - Wiggenhauser, Herbert T1 - Impulse Thermography for locating voids and honeycombing in concrete structures supported by numerical simulations T2 - Tagungsbeiträge des 11. Bauklimatisches Symposiums T2 - 11. Bauklimatisches Symposium ; 11th Symposium of Building Physics CY - Dresden, Germany DA - 2002-09-26 PY - 2002 SP - 242 EP - 252 PB - TU CY - Dresden AN - OPUS4-1828 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Maierhofer, Christiane A1 - Brink, Arne A1 - Röllig, Mathias A1 - Wiggenhauser, Herbert ED - Binda, L. T1 - Transient thermography for non-destructive investigation of building structures in the near surface region T2 - On-site control and evaluation of masonry structures T2 - RILEM TC 177-MDT Workshop on On-Site Control and Non-Destructive Evaluation of Masonry Structures CY - Mantova, Italy DA - 2001-11-12 KW - Non-destructive testing KW - Masonry KW - Concrete KW - Impulse thermography KW - Plaster KW - Laminates PY - 2003 SN - 2-912143-34-9 N1 - Serientitel: RILEM proceedings – Series title: RILEM proceedings IS - 26 SP - 251 EP - 261 PB - RILEM Publications CY - Bagneux, France AN - OPUS4-1829 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Maierhofer, Christiane A1 - Wöstmann, Jens A1 - Brink, Arne A1 - Röllig, Mathias T1 - Ortung von Hohlstellen und Ablösungen in Betonkonstruktionen mit Radar und Impuls-Thermografie T2 - GESA-Symposium 2003 T2 - 21. GESA-Symposium 2003 CY - Braunschweig, Deutschland DA - 2003-06-12 KW - Zerstörungsfreie Prüfung im Bauwesen KW - Radar KW - Impuls-Thermografie KW - Beton KW - Hohlstellen KW - Ablösungen PY - 2003 SN - 3-18-091757-1 SN - 0083-5560 N1 - Serientitel: VDI-Berichte – Series title: VDI-Berichte IS - 1757 SP - 281 EP - 292 PB - VDI-Verl. CY - Düsseldorf AN - OPUS4-3157 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Maierhofer, Christiane A1 - Arndt, Ralf A1 - Röllig, Mathias A1 - Weritz, Friederike A1 - Wiggenhauser, Herbert T1 - Untersuchung von Betonstrukturen mit der Puls-Phasen-Thermografie T2 - Thermografie-Kolloquium 2003 T2 - Thermografie-Kolloquium 2003 CY - Stuttgart, Deutschland DA - 2003-09-25 KW - Zerstörungsfreie Prüfung im Bauwesen KW - Impuls-Thermografie KW - Puls-Phasen Thermografie KW - Beton KW - Spaltklinker KW - Hohlstellen KW - Ablösungen PY - 2003 UR - http://www.ndt.net/search/docs.php3?date=2006-01&issue=1 SN - 3-931381-51-X N1 - Serientitel: DGZfP-Berichtsband – Series title: DGZfP-Berichtsband IS - 86-CD SP - 53 EP - 62 PB - DGZfP CY - Berlin AN - OPUS4-3158 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Maierhofer, Christiane A1 - Brink, Arne A1 - Röllig, Mathias A1 - Wiggenhauser, Herbert T1 - Quantitative Impulse-Thermography as Non-Destructive Testing Method in Civil Engineering - Experimental Results and Numerical Simulations JF - Construction & building materials N2 - Impulse-thermography is an active method for quantitative investigation of the near surface region of various structures which has recently been applied to civil engineering. It is well suited for the detection of voids and honeycombing in concrete up to concrete covers of 10 cm and more. For quantitative analysis, a computer program for numerical simulation of the heating up and cooling down processes was developed based on Finite Differences. With this program parameter studies have been performed for investigating the influence of environmental conditions, material parameters and geometry on the thermal behaviour. The comparison between experimental and simulated results enables the Inverse Solution. KW - Impulse-thermography KW - Numerical simulation KW - Non-destructive testing KW - Concrete KW - Civil engineering PY - 2005 SN - 0950-0618 VL - 19 IS - 10 SP - 731 EP - 737 PB - Elsevier CY - Oxford AN - OPUS4-3162 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Maierhofer, Christiane A1 - Brink, Arne A1 - Röllig, Mathias A1 - Wiggenhauser, Herbert A1 - Hillemeier, B. A1 - Rieck, C. T1 - Struktur- und Feuchteuntersuchung in Betonstrukturen mit der Impuls-Thermografie JF - Bauphysik KW - Zerstörungsfreie Prüfung im Bauwesen KW - Impuls-Thermografie KW - Beton KW - Hohlstellen KW - Kiesnester KW - Simulation PY - 2003 UR - http://www3.interscience.wiley.com/cgi-bin/jtoc/60500216/2005 SN - 0171-5445 SN - 1437-0980 VL - 25 IS - 1 SP - 22 EP - 26 PB - Ernst CY - Berlin AN - OPUS4-3164 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Brink, Arne A1 - Maierhofer, Christiane A1 - Röllig, Mathias A1 - Wiggenhauser, Herbert T1 - Anwendung der Impuls-Thermografie als zerstörungsfreies Prüfverfahren im Bauwesen T2 - Fachtagung Bauwerksdiagnose 2001 - Praktische Anwendungen Zerstörungsfreier Prüfungen T2 - Fachtagung Bauwerksdiagnose - Praktische Anwendungen Zerstörungsfreier Prüfungen CY - Leipzig, Deutschland DA - 2001-10-25 KW - Impuls-Thermografie KW - Thermografie KW - Zerstörungsfreie Prüfung KW - Abkühlungsprozess KW - Bauingenieurwesen KW - Beton KW - Spaltklinker KW - Simulation PY - 2001 N1 - Serientitel: Berichtsband / Deutsche Gesellschaft für zerstörungsfreie Prüfung e. V. – Series title: Berichtsband / Deutsche Gesellschaft für zerstörungsfreie Prüfung e. V. IS - 76-CD PB - DGZfP CY - Berlin AN - OPUS4-1187 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Brink, Arne A1 - Maierhofer, Christiane A1 - Röllig, Mathias A1 - Wiggenhauser, Herbert T1 - Auswertungsmethoden der Impuls-Thermografie zur Ortung von Fehlstellen in Betonstrukturen T2 - Thermografie-Kolloquium 2001 T2 - Thermografie-Kolloquium 2001 CY - Stuttgart, Deutschland DA - 2001-09-22 KW - Impuls-Thermografie KW - Thermografie KW - Zerstörungsfreie Prüfung KW - Abkühlvorgang KW - Bauingenieurwesen KW - Beton KW - Simulation PY - 2001 N1 - Serientitel: Berichtsband / Deutsche Gesellschaft für zerstörungsfreie Prüfung e. V. – Series title: Berichtsband / Deutsche Gesellschaft für zerstörungsfreie Prüfung e. V. IS - 77-CD SP - 1 EP - 10(?) PB - DGZfP CY - Berlin AN - OPUS4-1211 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Arndt, Ralf A1 - Maierhofer, Christiane A1 - Röllig, Mathias A1 - Weritz, Friederike A1 - Wiggenhauser, Herbert T1 - Structural investigation of concrete and masonry structures behind plaster by means of pulse phase thermography T2 - Proceedings of the 7th International Conference on Quantitative Infrared Thermography (QIRT 2004) T2 - 7th International Conference on Quantitative Infrared Thermography (QIRT 2004) CY - Rhode-St-Genese, Belgien DA - 2004-06-05 KW - Pulse phase thermography KW - Nondestructive testing in civil engineering KW - Plaster KW - Concrete KW - Masonry KW - Delaminations KW - Voids PY - 2004 SP - I.3.1 EP - I.3.6 PB - Karman Institute for Fluid Dynamics CY - Rhode-St-Genese AN - OPUS4-4397 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Röllig, Mathias A1 - Arndt, Ralf A1 - Maierhofer, Christiane T1 - Quantitative Untersuchung von Fehlstellen in Beton mit der Impuls-Thermografie und der Puls-Phasen-Thermografie T2 - Thermografie-Kolloquium der Deutschen Gesellschaft für Zerstörungsfreie Prüfung (DGZfP) T2 - Thermografie-Kolloquium der Deutschen Gesellschaft für Zerstörungsfreie Prüfung (DGZfP) CY - Stuttgart, Germany DA - 2005-09-22 PY - 2005 AN - OPUS4-11292 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Röllig, Mathias A1 - Arndt, Ralf A1 - Maierhofer, Christiane T1 - Quantitative Untersuchung von Fehlstellen in Beton mit der Impuls-Thermografie und der Puls-Phasen-Thermografie T2 - Thermographie-Kolloquium 2005 - gemeinsame Fachtagung aller Thermographie-Arbeitsgruppen T2 - Thermographie-Kolloquium 2005 CY - Stuttgart, Deutschland DA - 2005-09-22 KW - Impulse-Thermografie KW - Puls-Phasen-Thermografie KW - Zerstörungsfreie Prüfung im Bauwesen KW - Beton KW - Fehlstellen PY - 2005 SN - 3-931381-68-4 N1 - Serientitel: DGZfP-Berichtsband – Series title: DGZfP-Berichtsband IS - 98-CD SP - 1(?) EP - 13(?) PB - DGZfP CY - Berlin AN - OPUS4-11684 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Weritz, Friederike A1 - Arndt, Ralf A1 - Röllig, Mathias A1 - Maierhofer, Christiane A1 - Wiggenhauser, Herbert T1 - Investigation of concrete structures with pulse phase thermography JF - Materials and structures N2 - The applicability of pulse phase thermography (PPT) for the investigation of structures is studied systematically on concrete test specimens and on a plastered sandstone column. In the test specimens, voids and delaminations are implemented in different depths and with different sizes, modelling real voids, honeycombing and debonding. Delaminations of plaster in concrete and masonry and behind tiles on concrete are investigated. PPT is based on the frequency analysis of the cooling down process of actively heated surfaces. Therefore, it is contactless and thus completely non-destructive (if overheating of the surface is prevented), fast and allows the inspection of large surface areas. The interpretation of amplitude and phase images gives semi-quantitative information about the observed defects. The phase images provide a deeper probing up to 10–15 cm in relation to the interpretation of the thermograms and to the amplitude images. In addition, the influence of surface inhomogeneities and non-uniform heating is reduced. KW - Pulse phase thermography KW - Impulse thermography KW - Concrete KW - Voids KW - Honeycombing PY - 2005 DO - https://doi.org/10.1007/BF02481657 SN - 1359-5997 SN - 1871-6873 VL - 38 IS - 9 SP - 843 EP - 849 PB - Springer CY - Dordrecht AN - OPUS4-12300 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Arndt, Ralf A1 - Maierhofer, Christiane A1 - Röllig, Mathias T1 - Quantitative Pulse-Phase-Thermography for Masonry and Concrete Structures T2 - 9th European Conference on NDT N2 - An advanced quantitative approach of pulse-phase-thermography for nondestructive testing in civil engineering is described in this contribution. The characteristic frequency of the maximum phase-contrast between defects and sound areas is used as a means for the characterization of its depth. The new approach is tested in the laboratory on concrete structures with defects of polystyrene. The surfaces of the structures were heated with IR-radiators for varying time periods. The presented investigations were funded by the Deutsche Forschungsgemeinschaft (DFG) and were carried out in co-operation with the Technical University of Berlin (TUB). T2 - 9th European Conference on NDT CY - Berlin, Germany DA - 2006-09-25 KW - Quantitative non-destructive investigation KW - Impulse-thermography KW - Pulse-phase-thermography KW - Blind / characteristic frequency KW - Concrete PY - 2006 SN - 3-931381-86-2 SP - 1(?) EP - 8(?) PB - European Federation for Non-Destructive Testing CY - Berlin AN - OPUS4-13793 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Arndt, Ralf A1 - Helmerich, Rosemarie A1 - Maierhofer, Christiane A1 - Röllig, Mathias ED - Forde, M. T1 - Quantitative Pulse-Phase-Thermography for Composites and Concrete Structures T2 - Structural faults & repair 2006 (Proceedings) N2 - The active approach for non-destructive-testing in Civil Engineering (NDT-CE) with infraredthermography (IR), developed at the Federal Institute for Materials Research and Testing (BAM), is described in part one of this contribution. The active IR-approach is based on the principles of impulse- (IT) and pulse-phase-thermography (PPT). The concept is a direct result of a research project at the BAM in cooperation with the Technical University of Berlin (TUB) and was funded by the Deutsche Forschungsgemeinschaft (DFG). In the second part results of the new thermography-scanning system (thermo-scanner) of BAM on debonding of multi-layered structures, especially carbon fibre reinforced plates (CFRP) on concrete are presented. Both, the thermo-scanner developed at BAM, and the investigations carried out, are part of the EU-Project Sustainable Bridges. In the third part of the paper the characteristic frequency of the optimum phase-contrast as a means for the characterization of defects’ depth in CE by means of PPT is introduced. A new quantitative approach is tested and discussed on concrete structures with defects of polystyrene and gas concrete. T2 - 11th International Conference and Exhibiton "Structural Faults and Repair - 2006" CY - Edinburgh, Scotland, UK DA - 2006-06-13 KW - Quantitative NDT KW - Impulse-thermography KW - Pulse-phase-thermography KW - Blind / characteristic frequency KW - Concrete KW - Thermo-scanner KW - CFRP-laminates KW - Debonding KW - Voids PY - 2006 SN - 0-947644-59-8 SP - 1(?) EP - 17(?) PB - Engineering Technics Pr., CY - Edingburgh AN - OPUS4-13794 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Arndt, Ralf A1 - Maierhofer, Christiane A1 - Röllig, Mathias A1 - Weritz, Friederike A1 - Wiggenhauser, Herbert T1 - Ortung von Putzablösungen auf Beton und Mauerwerk mit der Puls-Phasen-Thermografie T2 - ZfP in Forschung, Entwicklung und Anwendung - Jahrestagung 2004 N2 - Abstract In the recent years the application of infrared thermography and especially its active approaches lock-in thermography, impulse themography and pulse phase thermography (PPT) has gained more importance for non-destructive testing (NDT). In this paper it is demonstrated that PPT is very well suited for NDT in civil engineering. The method is based on pulse heating of the investigated specimen and on the observation of the cooling down process on its surface with an infrared camera. The transient behaviour is afterwards analysed with Fast Fourier Transformation, enabling the creation of phase and amplitude images with enhanced visualisation of the defects. Results of European and National (i.e. DFG) funded projects are presented, for example the detection of voids and inhomogeneities close to the surface and the localisation of delaminations on plastered concrete and masonry specimen. ZUSAMMENFASSUNG Im Rahmen eines von der Deutschen Forschungsgemeinschaft geförderten Vorhabens zur zerstörungsfreien Prüfung im Bauwesen wird in der Bundesanstalt für Materialforschung und -prüfung (BAM) in Zusammenarbeit mit der Technischen Universität Berlin (TUB) die Puls-Phasen-Thermografie (PPT) weiterentwickelt, bewertet und eingesetzt. Die durch die Impuls-Thermografie (IT) aufgenommenen Daten werden mittels Fast Fourier Transformation (FFT) bearbeitet. Die durch die FFT gewonnenen Phasenbilder reduzieren die Störeinflüsse von Oberflächeninhomogenitäten und ungleichmäßiger Erwärmung. Die dargestellten Ergebnisse zeigen deutlich, dass sich die PPT sehr gut zur zerstörungsfreien Prüfung im Bauwesen eignet. Insbesondere Inhomogenitäten im oberflächennahen Bereich, wie Ablösungen und Hohlstellen hinter Beschichtungen (Putz, CFK-Laminate etc.), aber auch Defekte in größeren Tiefen können zuverlässig geortet und bildgebend dargestellt werden. T2 - Jahrestagung Zerstörungsfreie Materialprüfung 2004 CY - Salzburg, Österreich DA - 2004-05-17 KW - Puls-Phasen-Thermografie KW - Zerstörungsfreie Prüfung im Bauwesen KW - Putz auf Beton und Mauerwerk KW - Ortung von Fehlstellen und Ablösungen PY - 2004 UR - http://www.ndt.net/article/dgzfp04/papers/v89/v89.htm SN - 3-931381-55-2 SP - 1(?) EP - 10(?) PB - DGZfP CY - Berlin AN - OPUS4-5285 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Maierhofer, Christiane A1 - Brink, Arne A1 - Röllig, Mathias A1 - Wiggenhauser, Herbert T1 - Detection of shallow voids in concrete structures with impulse thermography and radar JF - NDT & E international N2 - New thermography systems enable the application of active investigation techniques, i.e. the observation of the cooling down process after heating the surface of a structure under investigation. Defects like voids in concrete having a different thermal diffusivity in comparison to the bulk material are visualised by different surface temperatures. The differences between temperature transient curves above sound regions and above inhomogeneities are expected to include information about the defect parameters. Experimental investigations with impulse thermography and radar on a concrete test specimen containing voids were analysed. Radar was used to determine the depth of the voids. The influence of size and depth of the voids on the temperature transient curves was studied for different heating times. The transient curves were also fitted with a simple semi-empirical model. KW - Impulse thermography KW - Radar KW - Non-destructive testing KW - Concrete KW - Civil engineering PY - 2003 SN - 0963-8695 VL - 36 IS - 4 SP - 257 EP - 263 PB - Butterworth-Heinemann CY - Oxford AN - OPUS4-11867 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Maierhofer, Christiane A1 - Wiggenhauser, Herbert A1 - Brink, Arne A1 - Röllig, Mathias T1 - Quantitative numerical analysis of transient IR-experiments on buildings JF - Infrared physics & technology N2 - Impulse-thermography has been established as a fast and reliable tool in many areas of non-destructive testing. In recent years several investigations have been done to apply active thermography to civil engineering. For quantitative investigations in this area of application, finite difference calculations have been performed for systematic studies on the influence of environmental conditions, heating power and time, defect depth and size and thermal properties of the bulk material (concrete). The comparison of simulated and experimental data enables the quantitative analysis of defects. T2 - 7th International Workshop on Advanced Infrared Technology and Applications ; 7th AITA Conference CY - Pisa, Italy DA - 2003-09-09 KW - Impulse-thermography KW - Numerical simulation KW - Non-destructive testing KW - Concrete KW - Civil engineering PY - 2004 DO - https://doi.org/10.1016/j.infrared.2004.03.022 SN - 1350-4495 VL - 46 IS - 1-2 SP - 173 EP - 180 PB - Pergamon Press CY - Oxford AN - OPUS4-4984 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Kautek, Wolfgang A1 - Pentzien, Simone A1 - Röllig, Mathias A1 - Rudolph, Pascale A1 - Krüger, Jörg A1 - Maywald-Pitellos, C. A1 - Bansa, H. A1 - Grösswang, H. A1 - König, E. T1 - Near-UV laser interaction with contaminants and pigments on parchment: laser cleaning diagnostics by SE-microscopy, VIS-, and IR-spectroscopy JF - Journal of cultural heritage PY - 2000 SN - 1296-2074 SN - 1778-3674 VL - 1 IS - sup.1 PB - Elsevier CY - Paris AN - OPUS4-5981 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Maierhofer, Christiane A1 - Reischel, Mercedes A1 - Krankenhagen, Rainer A1 - Myrach, Philipp A1 - Röllig, Mathias A1 - Steinfurth, Henrik T1 - Anwendungsbreiche und Grenzen der Blitzthermografie - Entwicklung eines anwendungsnahen Standards T2 - DACH-Jahrestagung 2012 - ZfP in Forschung, Entwicklung und Anwendung (Proceedings) T2 - DACH-Jahrestagung 2012 CY - Graz, Austria DA - 2012-09-17 KW - Blitzthermografie KW - CFK KW - Referenzprobekörper KW - Normung PY - 2012 SN - 978-3-940283-44-3 IS - DGZfP-BB 136 SP - Mi.2.C.1, 1 EP - 8 AN - OPUS4-28571 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Maierhofer, Christiane A1 - Reischel, Mercedes A1 - Steinfurth, Henrik A1 - Röllig, Mathias A1 - Myrach, Philipp A1 - Ziegler, Mathias ED - Cardone, G. T1 - Development of reference test specimens for the standardisation of active thermography with flash excitation T2 - QIRT 2012 - 11th International conference on Quantitative InfraRed Thermography (Proceedings) T2 - QIRT 11 - 11th International conference on Quantitative InfraRed Thermography CY - Naples, Italy DA - 2012-06-11 KW - Active thermography KW - Flash lamp KW - Standardisation KW - Reference test specimen PY - 2012 SP - 1 EP - 10(?) AN - OPUS4-26360 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Maierhofer, Christiane A1 - Krankenhagen, Rainer A1 - Röllig, Mathias A1 - Kalisch, U. A1 - Meinhardt, J. ED - Büyüköztürk, O. ED - Tasdemir, M.A. ED - Günes, O. ED - Akkaya, Y. T1 - Development and application of active thermography for monitoring of deterioration processes of historic structures T2 - Nondestructive testing of materials and structures N2 - As shown recently, the quantification of damage in historic masonry structures is possible by using active thermography. In this paper, a case study is presented concerning systematic studies of the determination of damage size and prognosis of damage increase inside a sandstone column by using different approaches of active thermography. Various heating sources as well as impulse and periodic heating have been compared. Reproducible investigations in regular time intervals for structural monitoring are possible. KW - Active thermography KW - Camera calibration KW - Historic structure KW - Monitoring KW - Sandstone PY - 2013 SN - 978-94-007-0722-1 DO - https://doi.org/10.1007/978-94-007-0723-8_154 SN - 2211-0844 N1 - Serientitel: RILEM bookseries – Series title: RILEM bookseries VL - 6 SP - 1111 EP - 1116 PB - Springer AN - OPUS4-28263 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Krankenhagen, Rainer A1 - Maierhofer, Christiane A1 - Röllig, Mathias ED - Büyüköztürk, O. ED - Tasdemir, M.A. ED - Günes, O. ED - Akkaya, Y. T1 - Thermographic investigation of delaminated plaster on concrete T2 - Nondestructive testing of materials and structures N2 - Active thermography is sensitive to inhomogeneities at and below the surface of objects investigated. Thus, it should be useful for detecting plaster delaminations on concrete. In this paper, the results of field and laboratory investigations into plaster-covered concrete were compared. For evaluating the bonding state of the plaster it is not sufficient to study only the thermal contrasts at the surface of the investigated objects. The experimental results suggest that the overall thermal behaviour has to be considered. KW - Active thermography KW - Bonding problems KW - Concrete KW - Plaster PY - 2013 SN - 978-94-007-0722-1 DO - https://doi.org/10.1007/978-94-007-0723-8_112 SN - 2211-0844 N1 - Serientitel: RILEM bookseries – Series title: RILEM bookseries VL - 6 SP - 758 EP - 791 PB - Springer AN - OPUS4-28264 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Maierhofer, Christiane A1 - Krankenhagen, Rainer A1 - Reischel, Mercedes A1 - Myrach, Philipp A1 - Steinfurth, Henrik A1 - Röllig, Mathias T1 - Anwendung der aktiven Thermografie zur zerstörungsfreien Prüfung von Faserverbundwerkstoffen T1 - Application of active thermography for non-destructive testing of fibre reinforced composites T2 - Temperatur 2013 - Verfahren und Geräte in der Temperatur- und Feuchtemesstechnik N2 - In diesem Beitrag werden Anwendungsbeispiele der aktiven Thermografie zur zerstörungsfreien Untersuchung von Faserverbundwerkstoffen vorgestellt. Ziel der Anwendung und Weiterentwicklung des Verfahrens ist nicht nur die Ortung, sondern auch die quantitative Beschreibung von Fehlstellen und Schäden. N2 - In this paper case studies are presented concerning non-destructive testing of fibre reinforced composites using active thermography. The main objective of the application and further development of the method is not only the detection, but also the quantitative characterisation of faults and damage. T2 - Temperatur 2013 - Verfahren und Geräte in der Temperatur- und Feuchtemesstechnik CY - Berlin, Germany DA - 05.06.2013 KW - CFK KW - Impact-Schaden KW - Aktive Thermografie KW - Blitzanregung KW - Temperaturleitfähigkeit PY - 2013 SN - 3-9810021-8-0 SP - 143 EP - 148 AN - OPUS4-28836 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Maierhofer, Christiane A1 - Röllig, Mathias A1 - Steinfurth, Henrik A1 - Ziegler, Mathias A1 - Heck, S.J. A1 - Scheuerlein, C. T1 - Aktive Thermografie zur zerstörungsfreien Prüfung von Lötverbindungen T2 - DGZfP-Jahrestagung 2011 N2 - In diesem Beitrag werden die Möglichkeiten der Ortung von Fehlstellen in Cu Lötverbindungen unterhalb verschiedener Cu Blechdicken mit aktiver Thermografie demonstriert. Dabei wurden die Anregung mit Blitzlicht und die periodische Anregung mit der Lock-In Technik miteinander verglichen. Die Vor- und Nachteile der Anwendung unterschiedlicher IR-Kamerasysteme, einer gekühlten InSb-Quantendetektor IR-Kamera und einer Mikrobolometer IR-Kamera, werden dargestellt. Als objektives Kriterium wurde das SNR für unterschiedliche Fehlstellengrößen herangezogen. T2 - DGZfP-Jahrestagung 2011 CY - Bremen, Germany DA - 30.05.2011 KW - Aktive Thermografie KW - Blitzlichtanregung KW - Lock-In Anregung KW - Lötverbindung KW - Kupfer PY - 2011 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-249935 SN - 978-3-940283-33-7 IS - DGZfP-BB 127 (Di.1.C.1) SP - 1 EP - 8 PB - Deutsche Gesellschaft für Zerstörungsfreie Prüfung (DGZfP) AN - OPUS4-24993 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Maierhofer, Christiane A1 - Röllig, Mathias A1 - Steinfurth, Henrik A1 - Ziegler, Mathias A1 - Kreutzbruck, Marc A1 - Scheuerlein, C. A1 - Heck, S. T1 - Non-destructive testing of Cu solder connections using active thermography JF - NDT & E international N2 - Impulse and lock-in thermography have been applied to detect delaminations of prototype solder joints, similar to those to be produced between Cu shunts and Cu busbar stabilisers at the Large Hadron Collider (LHC) at CERN. Two infrared cameras with different detector materials and with different spectral ranges and two excitation techniques have been tested and compared for their ability to detect delaminations behind 2 and 3 mm thick Cu shunts. We have analyzed the signal to noise ratio (SNR) for each detected defect and are able to detect defects down to a nominal edge length of 4 mm behind 2 mm thick Cu shunts by using fast impulse thermography and a camera with a microbolometer array. For the 3 mm thick Cu shunt, on the other hand, the nominal 4 mm defect is only visible in the lock-in thermography phase images and the highest SNR has been achieved with a cooled InSb-based camera. In addition, numerical simulations show the influence of the minimum detectable defect size on the shunt thickness and that the developed on-site testing technique is sufficient to find all defects that are detectable theoretically. KW - Active thermography KW - Solder joint KW - Copper KW - FFT KW - Signal-to-noise-ratio PY - 2012 DO - https://doi.org/10.1016/j.ndteint.2012.07.010 SN - 0963-8695 VL - 52 SP - 103 EP - 111 PB - Butterworth-Heinemann CY - Oxford AN - OPUS4-27575 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Götschel, S. A1 - Weiser, M. A1 - Maierhofer, Christiane A1 - Richter, Regina A1 - Röllig, Mathias ED - Büyüköztürk, O. ED - Tasdemir, M.A. ED - Günes, O. ED - Akkaya, Y. T1 - Fast defect shape reconstruction based on the travel time in pulse thermography T2 - Nondestructive testing of materials and structures N2 - Pulse thermography is a non-destructive testing method based on ­infrared imaging of transient thermal patterns. Heating the surface of the structure under test for a short period of time generates a non-stationary temperature distribution and thus a thermal contrast between the defect and the sound material. In modern NDT, a quantitative characterization of hidden imperfections in materials is desired. In particular, defect depth and shape are of interest. The reconstruction of the defect from thermography data is a nonlinear inverse problem, and ill-posed. We propose an algorithm for the identification of subsurface defects based on the travel time of the reflected thermal pulse. Our work extends results by Lugin and Netzelmann, taking lateral thermal flows directly into account while retrieving the defect depth. This requires significantly less computational work. Quantitative information about the defect shape and depth is obtained. Application of our method to both thermography data generated by a finite element simulation and experimental heating of PVC test specimens with different defects yields good reconstruction of the actual defects. KW - Defect shape reconstruction KW - Finite element simulation KW - Pulsed thermography KW - Quantitative characterization KW - Thermal contrast KW - Inversion KW - Aktive Thermografie KW - Wanddicke KW - Rückwand KW - Minderdicken KW - Schichtdicken KW - Thermische Welle PY - 2013 SN - 978-94-007-0722-1 DO - https://doi.org/10.1007/978-94-007-0723-8_11 SN - 2211-0844 N1 - Serientitel: RILEM bookseries – Series title: RILEM bookseries VL - 6 SP - 83 EP - 89 PB - Springer AN - OPUS4-27619 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Arndt, Ralf A1 - Maierhofer, Christiane A1 - Röllig, Mathias A1 - Hillemeier, B. A1 - Rieck, C. A1 - Scheel, H. A1 - Walther, A. T1 - Struktur- und Feuchteuntersuchungen von Bauteil- und Bauwerksoberflächen mit der Impuls-Thermografie T2 - Thermographie-Kolloquium 2005 - gemeinsame Fachtagung aller Thermographie-Arbeitsgruppen T2 - Thermografie-Kolloquium der DGZfP CY - Stuttgart, Deutschland DA - 2005-09-22 KW - Impulse-Thermografie KW - Zerstörungsfreie Prüfung im Bauwesen KW - Beton KW - Mauerwerk PY - 2005 SN - 3-931381-68-4 N1 - Serientitel: DGZfP-Berichtsband – Series title: DGZfP-Berichtsband IS - 98-CD SP - 1(?) EP - 12(?) PB - DGZfP CY - Berlin AN - OPUS4-11491 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Helmerich, Rosemarie A1 - Röllig, Mathias A1 - Schultz, A. A1 - Vielhaber, J. ED - Jan Bien, ED - Lennart Elfgren, ED - Jan Olofsson, T1 - Quality assurance of CRFP-strengthened reinforced concrete structures using automated thermographic investigation T2 - Sustainable Bridges - Assessment for Future Traffic Demands and Longer Lives KW - Quality assurance KW - Bridge repair and strengthening KW - Railway bridges KW - Non-destructive testing KW - Automated scanning PY - 2007 SN - 978-83-7125-161-0 SP - 321 EP - 330 PB - Dolnoslaskie Wydawnictwo Edukacyjne CY - Wroclaw, Poland AN - OPUS4-16091 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Lamprecht, I. A1 - Maierhofer, Christiane A1 - Röllig, Mathias T1 - Infrared Thermography and Thermometry of Phototropic Plants JF - Journal of thermal analysis and calorimetry N2 - Thermal investigations using infrared (IR) thermometry and false colour thermography were carried out on flowering plants in the Botanical Garden of Berlin and in a private garden. Special interest went to phototropic plants that orient their blossoms towards a light source (mainly the sun) and within this group to solar trackers (heliotropism) that follow the path of the sun during the day. Best known among the latter is the sunflower. Bowl shaped flowers comparable to satellite disks focus the solar radiation effectively on their centre, resulting in a warming of the female organs at that point. Temperature differences above ambient can be as high as 10.7 K with a mean value of 6.0 K. Pollinating insects were often observed sun-basking in the bowls or on the flower disks attracted by energetic rewards in form of nectar and heat. KW - Insects KW - IR thermography KW - IR thermometry KW - Phototropism KW - Plants PY - 2007 DO - https://doi.org/10.1007/s10973-006-7806-9 SN - 1388-6150 SN - 1418-2874 SN - 0368-4466 SN - 1572-8943 VL - 87 IS - 1 SP - 49 EP - 54 PB - Kluwer Academic Publ. CY - Dordrecht AN - OPUS4-16096 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Maierhofer, Christiane A1 - Röllig, Mathias A1 - Arndt, Ralf T1 - Einfluss von Oberflächen- und Volumeneigenschaften auf die Zerstörungsfreie Prüfung von Beton und Mauerwerk mit aktiver Thermografie T2 - DACH-Jahrestagung 2008 - Zerstörungsfreie Materialprüfung, ZfP in Forschung, Entwicklung und Anwendung, 28.- 30.4.2008, St. Gallen, Schweiz T2 - DACH-Jahrestagung 2008 - Zerstörungsfreie Materialprüfung, ZfP in Forschung, Entwicklung und Anwendung CY - St. Gallen, Schweiz DA - 2008-04-28 KW - Aktive Thermografie KW - Zerstörungsfreie Prüfung im Bauwesen KW - Beton KW - Mauerwerk KW - Hohlstellen KW - Kiesnester KW - Oberflächeneigenschaften KW - Feuchte PY - 2008 SN - 978-3-940283-09-2 IS - DGZfP-BB 113 (Mi.4.A.3) SP - 1 EP - 8 AN - OPUS4-18358 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Helmerich, Rosemarie A1 - Röllig, Mathias A1 - Maierhofer, Christiane A1 - Schultz, A. A1 - Vielhaber, J. A1 - Loehr, M. T1 - Non-destructive CFRP-bond evaluation T2 - 8th International Symposium on Fiber Reinforced Polymer Reinforcement for Concrete Structures (FRPRCS-8) - Proceedings T2 - 8th International Symposium on Fiber Reinforced Polymer Reinforcement for Concrete Structures (FRPRCS-8) CY - Patras, Greece DA - 2007-07-16 KW - Bond behaviour KW - Impulse thermography KW - Effectiveness of repair KW - CFRP-strengthening KW - Large scale testing KW - Validation KW - Acoustic emission KW - Combination of NDT-methods PY - 2007 SP - 106-107 (2-24) CY - Patras, Greece AN - OPUS4-15706 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Maierhofer, Christiane A1 - Arndt, Ralf A1 - Röllig, Mathias A1 - Helmerich, Rosemarie A1 - Walther, A. A1 - Hillemeier, B. A1 - Rieck, C. T1 - Quantification of Voids and Elaminations in Real Concrete and Masonry Structures with Active Thermography: Case Studies T2 - 8th International Conference on Quantitative InfraRed Thermography (QIRT 2006) T2 - 8th International Conference on Quantitative InfraRed Thermography (QIRT 2006) CY - Padova, Italy DA - 2006-06-28 KW - Non-destructive testing in civil engineering KW - Active thermography KW - Pulse-phase thermography KW - Plaster KW - Tiles KW - Asphalt KW - Numerical simulation PY - 2006 UR - http://qirt.gel.ulaval.ca/archives/qirt2006/papers/049.pdf SP - 49, 1 EP - 10 (?) CY - Padova, Italy AN - OPUS4-15710 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Maierhofer, Christiane A1 - Krause, Martin A1 - Wöstmann, Jens A1 - Röllig, Mathias A1 - Arndt, Ralf A1 - Streicher, Doreen A1 - Kohl, C. ED - L. Binda, ED - M. di Prisco, ED - R. Felicetti, T1 - Influence of concret properties on the calibration of radar, ultrasonics and active thermography T2 - 1st International RILEM Conference - on Site Assessment of Concrete, Masonry and Timber Structures (SACoMaTiS 2008), Proceedings T2 - 1st International RILEM Conference, on Site Assessment of Concrete, Masonry and Timber Structures (SACoMaTiS 2008) CY - Varenna, Italy DA - 2008-09-01 KW - Concrete KW - Radar KW - Ultrasonics KW - Active thermography KW - Velocity calibration PY - 2008 SN - 978-2-35158-062-2 VL - 1 IS - PRO 59 SP - 15 EP - 24 PB - RILEM Publications AN - OPUS4-18033 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Maierhofer, Christiane A1 - Wöstmann, Jens A1 - Trela, Christiane A1 - Röllig, Mathias ED - L. Binda, ED - M. di Prisco, ED - R. Felicetti, T1 - Investigation of moisture content and distribution with radar and active thermography T2 - 1st International RILEM Conference - on Site Assessment of Concrete, Masonry and Timber Structures (SACoMaTiS 2008), Proceedings T2 - 1st International RILEM Conference, on Site Assessment of Concrete, Masonry and Timber Structures (SACoMaTiS 2008) CY - Varenna, Italy DA - 2008-09-01 KW - Radar KW - Active thermography KW - Non-destructive testing KW - Moisture KW - Masonry PY - 2008 SN - 978-2-35158-062-2 VL - 1 IS - PRO 59 SP - 411 EP - 420 PB - RILEM Publications AN - OPUS4-18032 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Maierhofer, Christiane A1 - Arndt, Ralf A1 - Röllig, Mathias T1 - Aktive Thermografie zur zerstörungsfreien Ortung von Ablösungen und Fehlstellen in Beton und Mauerwerk T2 - Fachtagung Bauwerksdiagnose 2006 - Praktische Anwendungen Zerstörungsfreier Prüfungen T2 - DGZfP-Fachtagung Bauwerksdiagnose "Praktische Anwendungen Zerstörungsfreier Prüfungen" CY - Berlin, Deutschland DA - 2006-02-22 KW - Zerstörungsfreie Prüfung im Bauwesen KW - Aktive Thermografie KW - Beton KW - Historisches Mauerwerk KW - Praktische Anwendungen PY - 2006 SN - 3-931381-71-4 SP - 1 EP - 12(?) PB - DGZfP CY - Berlin AN - OPUS4-14120 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Maierhofer, Christiane A1 - Arndt, Ralf A1 - Borchardt, Kerstin A1 - Hasenstab, Andreas A1 - Röllig, Mathias A1 - Wöstmann, Jens ED - Radic, J. ED - Rajcic, V. ED - Zarnic, R. T1 - Structural assessment with radar and active thermography T2 - Proceedings of the Conference and Brokerage Event "The Construction Aspects of the Heritage Protection" T2 - Conference and Brokerage Event "The Construction Aspects of the Heritage Protection" CY - Dubrovnik, Croatia DA - 2006-10-14 KW - Non-destructive testing in civil engineering KW - Radar KW - Active thermography KW - Historic structures KW - Masonry KW - Stone KW - Wood KW - Plaster PY - 2006 IS - CD-ROM SP - 77 EP - 86 PB - SECON (Structural Engineering Conferences) CY - Dubrovnik AN - OPUS4-14255 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Lamprecht, I. A1 - Maierhofer, Christiane A1 - Röllig, Mathias T1 - A thermographic promenade through the Berlin Botanic Garden JF - Thermochimica Acta N2 - False colour infrared (IR) thermography was performed on a sunny summer day in the Berlin Botanic Garden. The main interest focused on blossoms of different size, colours and shapes: disk-, bowl- and funnel-like anatomy demonstrating various modes of light absorption and heating-up during the day. Some of the flowers were phototropic or even solar tracking. Blossom temperatures ranged from 18.0 to 33.3 °C (mean 26.3 ± 2.5 °C, S.D., n = 37) at 21 °C air temperature. Several thermograms showed honey- and bumblebees also. In some cases the results are compared with those of a contact-free IR thermometry. One winter- and one late-spring-flowering plant are included in the overview. KW - Infrared KW - Insects KW - Plants KW - Thermography KW - Thermometry PY - 2006 DO - https://doi.org/10.1016/j.tca.2006.02.039 SN - 0040-6031 SN - 1872-762X VL - 446 IS - 1-2 SP - 4 EP - 10 PB - Elsevier CY - Amsterdam AN - OPUS4-14433 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Helmerich, Rosemarie A1 - Maierhofer, Christiane A1 - Röllig, Mathias A1 - Arndt, Ralf A1 - Vielhaber, J. ED - Cruz, P. ED - Frangopol, D. T1 - Bond quality survey of loaded RC beams with CFRP-plate repair using impulse-thermography T2 - Bridge maintenance, safety, management, life-cycle performance and cost T2 - Bridge Maintenance, Safety, Management, Life-Cycle Performance and Cost CY - Porto, Portugal DA - 2006-07-16 KW - Thermography KW - Quality control KW - Bonding KW - Carbon fibre KW - Concrete bridges KW - Repair KW - Strengthening PY - 2006 SN - 0-415-40315-4 N1 - Serientitel: Balkema proceedings and monographs in engineering, water and earth sciences – Series title: Balkema proceedings and monographs in engineering, water and earth sciences SP - 331-332 (Book)/ 9 pages (CD-ROM) PB - Taylor & Francis CY - London AN - OPUS4-14412 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Arndt, Ralf A1 - Maierhofer, Christiane A1 - Röllig, Mathias A1 - Walsdorf-Maul, Manuela T1 - Quantitative Phasen- und Amplitudenauswertung im Frequenzbereich für aktive Thermografie mit Rechteckimpuls-Erwärmung T2 - Thermografie-Kolloquium 2007 N2 - Nach einer Einführung in die Puls-Phasen-Thermografie (PPT) wird ein neuer Ansatz für die Defekttiefenbestimmung im Frequenzraum mittels der sogenannten charakteristischen Frequenz des minimalen Phasen- und Amplitudenkontrastes zwischen Fehlstelle und ungestörtem Bereich entwickelt und anhand von systematischen Untersuchungen an Probekörpern der Bundesanstalt für Materialforschung und -prüfung und ergänzenden Simulationsrechnungen überprüft. Die mit Rechteckimpuls-Spektral-Thermografie (RST) bezeichnete Methode, die auch als eine Rechteckimpuls-Thermografie (RIT) im Frequenzbereich oder eine durch Amplitudenauswertung ergänzte PPT für Rechteckimpulserwärmung verstanden werden kann, soll die existierenden Ansätze ergänzen und bietet eine Alternative für die Tiefenbestimmung von Defekten bei Messungen mit langen Erwärmungs- und Beobachtungszeiten, wie sie bei Anwendung von aktiver Thermografie im Bauwesen häufig vorkommen. T2 - Thermografie-Kolloquium 2007 CY - Stuttgart, Deutschland DA - 2007-09-27 KW - Puls-Phasen-Thermografie KW - Rechteckimpuls-Erwärmung KW - Zerstörungsfreie Prüfung im Bauwesen KW - Quantitative Methode PY - 2007 SN - 978-3-940283-03-0 IS - 107-CD SP - 52 EP - 60 AN - OPUS4-16128 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Arndt, Ralf A1 - Hillemeier, B. A1 - Maierhofer, Christiane A1 - Rieck, C. A1 - Röllig, Mathias A1 - Scheel, H. A1 - Walther, A. T1 - Zerstörungsfreie Ortung von Fehlstellen und Inhomogenitäten in Bauteilen mit der Impuls-Thermografie JF - Die Bautechnik KW - Impuls-Thermografie KW - Puls-Phasen-Thermografie KW - Zerstörungsfreie Prüfung KW - Ortung von Fehlstellen KW - Ablösungen und Verpressfehler PY - 2004 SN - 0005-6820 SN - 1437-0999 SN - 0341-1052 SN - 0932-6359 SN - 0932-8351 VL - 81 IS - 10 SP - 786 EP - 793 PB - Ernst CY - Berlin AN - OPUS4-4572 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Helmerich, Rosemarie A1 - Röllig, Mathias A1 - Maierhofer, Christiane A1 - Schultz, A. ED - Vincentsen, L. T1 - Bond Control in CFRP-strengthened RC-structures using Active Thermography T2 - Proceedings of the International Association for Bridge and Structural Engineering (IABSE) Conference on Operation, Maintenance and Rehabilitation of Large Infrastructure Projects, Bridges and Tunnels T2 - Conference on Operation, Maintenance and Rehabilitation of Large Infrastructure Projects, Bridges and Tunnels CY - Copenhagen, Denmark DA - 2006-05-15 KW - Quality control KW - Impulse-Thermography (IR) KW - Debonding KW - Supervision of CFRP-Strengthening KW - Laboratory Testing PY - 2006 SN - 87-91044-03-0 SP - 1(?) EP - 8(?) PB - IABSE CY - Zürich AN - OPUS4-12407 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Maierhofer, Christiane A1 - Arndt, Ralf A1 - Röllig, Mathias A1 - Rieck, C. A1 - Walther, A. A1 - Scheel, H. A1 - Hillemeier, B. T1 - Application of impulse-thermography for non-destructive assessment of concrete structures JF - Cement & concrete composites N2 - Impulse-thermography is an active method for quantitative investigations of the near surface region of various structures. It has recently been applied and optimised to applications in civil engineering. By using either an internal or external heat source, parts of the structure under investigation are heated up and the transient heat flux is observed by recording the temperature change at the surface as a function of time. This method is very well suited for the detection of voids and honeycombing in concrete, up to concrete covers of 10 cm as well as for the location of delaminations in multi-layered systems (e.g. plaster on concrete, CFRP-laminates on concrete, asphalt on concrete). Also safety relevant defects like voids in tendon ducts and cracks in concrete could be recognised. KW - Non-destructive testing KW - Impulse-thermography KW - Concrete KW - CFRP-laminates KW - Delamination KW - Tendon duct KW - Voids KW - Compaction faults PY - 2006 DO - https://doi.org/10.1016/j.cemconcomp.2006.02.011 SN - 0958-9465 SN - 1873-393X VL - 28 IS - 4 SP - 393 EP - 401 PB - Elsevier CY - Barking, Essex AN - OPUS4-12359 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Helmerich, Rosemarie A1 - Milmann, Boris A1 - Wöstmann, Jens A1 - Röllig, Mathias A1 - Kind, Thomas A1 - Lai, W. T1 - Qualitätssicherung für textilfaserverstärkten Beton JF - Tudalit-Magazin T2 - 5. Anwendertagung Textilbeton CY - Friedrichshafen, Germany DA - 2013-09-24 KW - Textilfaserverstärkter Beton KW - Zerstörungsfreie Prüfung KW - Ultraschall-Echo KW - Radar-Echo PY - 2013 VL - 9 SP - 22 AN - OPUS4-29512 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Maierhofer, Christiane A1 - Myrach, Philipp A1 - Reischel, Mercedes A1 - Steinfurth, Henrik A1 - Röllig, Mathias A1 - Kunert, M. T1 - Characterizing damage in CFRP structures using flash thermography in reflection and transmission configurations JF - Composites / B N2 - Carbon fiber reinforced polymer (CFRP) specimens with artificial delaminations and with impact damage have been characterized using active thermography with flash excitation. Systematic investigations have been performed in four different experimental configurations of flash lamps and infrared (IR) camera in transmission as well as in reflection alignment. It is shown here that the diffusivities determined for the sound and for the damaged areas give a good measure for damage characterization. Although reflection measurements also give information about defect depth, reflection measurements from only one side are not sufficient for assessing the whole cross section of the specimens. Thus, depending on sample thickness the lateral size of damage could only be determined from reflections measurements from both sides or from transmission measurements. In this paper, measurement accuracy and limits of flash thermography for the investigation of CFRP specimens are presented in detail together with quantitative data concerning the defects. KW - D. Non-destructive testing KW - D. Thermal analysis KW - B. Thermal properties KW - B. Delamination KW - Flash thermography PY - 2014 DO - https://doi.org/10.1016/j.compositesb.2013.09.036 SN - 1359-8368 VL - 57 SP - 35 EP - 46 PB - Elsevier CY - Oxford [u.a.] AN - OPUS4-29582 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -