Investigations of subsurface structures and buried inhomogeneities by photothermal inspection

M. Reigl, M. Gapp, B. Schmitz, J. Stein, G. Goch, U. Seidel, H.G. Walther
1994 Proceedings of the 1994 International Conference on Quantitative InfraRed Thermography   unpublished
Among optical methods the photothermal radiometry offers a new metrological technique for the successful investigation of subsurface defects, buried inhomogeneities and structures beneath an optical opaque surface. In these investigations, the thermal waves reflect several sets of information about the inner and outer structures, about optical, thermal and mechanical properties. The purpose of this contribution is the presentation of theoretical calculations for simulation of measuring signals
more » ... nd reconstruction of buried inhomogeneities from measured amplitude and phase signals. Hence, experimental results can yield a reliable defect identification and identification of surface and subsurface thermal features.
doi:10.21611/qirt.1994.035 fatcat:x4hbjxn5sjgazhusp6qk34q4ru