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18 April 2006 Transient thermal NDT and E of defects in building materials
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Proceedings Volume 6205, Thermosense XXVIII; 620516 (2006)
Event: Defense and Security Symposium, 2006, Orlando (Kissimmee), Florida, United States
In this work, infrared thermography (IRT) was used for the investigation of structural materials using the active approach. Four types of building materials were examined; three types of porous stone (from Rhodes, Cyprus, Rethymno - Crete) and one type of marble (Dionysus). Specimens containing self-induced defects of known dimensions and depths were studied. The samples were heated externally (thermal excitation) and thermograms were recorded continuously at the transient phase. Mathematical - thermal modelling enabling the modelling of the investigated subsurface defects, using the thermocalc 3-D software, was also implemented. Then, quantification analysis (i.e. temperature - time plots, as well as thermal contrast curves) from the experimental tests, as well as from the use of thermal modelling runs took place, indicating the thermal behaviour of building materials containing such defects. The results of this research show that IRT can be used for the detection and quantification of defects in structural materials.
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N. P. Avdelidis, D. Stavrakas, and A. Moropoulou "Transient thermal NDT and E of defects in building materials", Proc. SPIE 6205, Thermosense XXVIII, 620516 (18 April 2006);

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