TY - JOUR A1 - Kohl, Christoph A1 - Krause, Martin A1 - Maierhofer, Christiane A1 - Mayer, K. A1 - Wöstmann, Jens A1 - Wiggenhauser, Herbert T1 - 3D-visualisation of NDT data using a data fusion technique KW - Non-destructive testing KW - Radar KW - Ultrasonic KW - Data fusion KW - SAFT PY - 2003 SN - 0007-1137 VL - 45 IS - 12 SP - 800 EP - 808 PB - British Institute of Non-Destructive Testing CY - Northampton AN - OPUS4-4585 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Kohl, Christoph A1 - Krause, Martin A1 - Maierhofer, Christiane A1 - Wöstmann, Jens A1 - Wiggenhauser, Herbert T1 - Datenfusion komplementärer Impuls-Echo Verfahren zur zerstörungsfreien Untersuchung von Betonbauteilen T2 - Jahrestagung Zerstörungsfreie Materialprüfung 2004 CY - Salzburg, Österreich DA - 2004-05-17 KW - Zerstörungsfreie Prüfung im Bauwesen KW - Radar KW - Ultraschall KW - Impact-Echo KW - Datenfusion KW - SAFT PY - 2004 UR - http://www.ndt.net/article/dgzfp04/papers/p37/p37.htm SN - 3-931381-55-2 SP - 1 EP - 15(?) PB - DGZfP CY - Berlin AN - OPUS4-5603 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Krause, Martin A1 - Maierhofer, Christiane A1 - Gardei, André A1 - Kohl, Christoph A1 - Wiggenhauser, Herbert ED - Naus, D. J. T1 - Improvement and combination of echo methods for NDT of concrete elements T2 - 2nd International RILEM Workshop on Life Prediction and Aging Management of Concrete Structures CY - Paris, France DA - 2003-05-05 PY - 2003 SN - 2-912143-36-5 IS - 29 SP - 137 EP - 147 PB - RILEM Publications CY - Bagneux AN - OPUS4-2621 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Wiggenhauser, Herbert A1 - Gardei, André A1 - Kohl, Christoph A1 - Maierhofer, Christiane A1 - Krause, Martin A1 - Streicher, Doreen ED - Watanabe, E. ED - Frangopol, D. T1 - Development and Application of Echo-Methods for NDE of Post Tensioned Concrete Bridges T2 - 2nd International Conference on Bridge Maintenance, Safety and Management CY - Kyoto, Japan DA - 2004-10-19 KW - ZfPBau KW - Spannbetonbrücken KW - Ultraschall Echo KW - Impact-Echo KW - Impuls Radar PY - 2004 SN - 90-5809-680-7 PB - Balkema CY - Leiden AN - OPUS4-4739 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Maierhofer, Christiane A1 - Krause, Martin A1 - Mielentz, Frank A1 - Streicher, Doreen A1 - Milmann, Boris A1 - Gardei, André A1 - Kohl, Christoph A1 - Wiggenhauser, Herbert T1 - Complementary application of radar, impact-echo and ultrasonics for testing concrete structures and metallic tendon ducts T2 - 83rd Annual Meeting Transportation Research Board of the National Academies CY - Washington, D. C., USA DA - 2004-01-11 KW - Non-destructive testing KW - Tendon duct KW - Concrete bridge KW - Radar KW - Ultrasonic KW - Impact-echo PY - 2004 SP - 18 pages CY - Washington AN - OPUS4-4909 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 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 - 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 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 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 - Weritz, Friederike A1 - Arndt, Ralf A1 - Röllig, Mathias A1 - Maierhofer, Christiane A1 - Wiggenhauser, Herbert T1 - Investigation of concrete structures with pulse phase thermography 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 - Wiggenhauser, Herbert A1 - Krause, Martin A1 - Maierhofer, Christiane A1 - Algernon, Daniel A1 - Gardei, André A1 - Gräfe, Boris A1 - Kohl, Christoph A1 - Lausch, Regine A1 - Mielentz, Frank A1 - Milmann, Boris A1 - Streicher, Doreen A1 - Zacher, Gerhard T1 - Grundlagen kombinierter zerstörungsfreier Prüfverfahren zur Untersuchung von Betonbauteilen T2 - Forschergruppe 384 Abschlusskolloquium CY - Bergisch Gladbach, Deutschland DA - 2007-05-03 PY - 2007 SP - 23 EP - 44 PB - BAM CY - Berlin AN - OPUS4-14805 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -