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 - 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) 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) 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 - Wöstmann, Jens A1 - Röllig, Mathias A1 - Köpp, Christian A1 - Borchardt, Kerstin ED - Mateja Golez, T1 - Non-destructive testing of walls and ground of the Carthusian monastery at Zice KW - Non-destructive testing KW - Active thermography KW - Radar KW - Brick KW - Stone KW - Masonry PY - 2009 SN - 978-961-90366-4-8 SP - 101 EP - 117 CY - Ljubljana, Slovenia AN - OPUS4-19742 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 - 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 - CHAP A1 - Maierhofer, Christiane A1 - Röllig, Mathias A1 - Kalisch, U. T1 - Qualifizierung und Vergleich zerstörungsfreier Prüfverfahren an historischem Mauerwerk: Messungen an Probekörpern und Fallstudien T2 - 4. Konservierungswissenschaftliches Kolloquium - Zerstörungsfreie Oberflächenuntersuchungsmethoden - Stand der Technik, Grenzen und Ausblicke CY - Potsdam, Deutschland DA - 2010-10-29 KW - Historisches Mauerwerk KW - Aktive Thermografie KW - Radar KW - Validierung PY - 2010 SN - 978-3-88462-305-3 IS - Kap. 1 SP - 9 EP - 15 PB - Wernersche Verlagsgesellschaft AN - OPUS4-22637 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 - 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 -