Infrared thermal-wave studies of coatings and composites

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Abstract
We present applications of our infrared thermal wave imaging system which was described in detail at Thermosense XII. In brief, the system consists of an infrared video camera and a real time image processor under the control of a computer workstation, together with various time- dependent heat sources. The heat sources are used to launch pulsed or periodic thermal waves into the target, and the camera is used to record the thermal waves scattered back to the surface by sub-surface thermal features (cracks, coating substrate boundaries, inter-ply delaminations, etc.). Recently we have succeeded in developing an additional capability for this instrumentation, namely the ability to make quantitative depth and thickness measurements. Furthermore, some of the authors, together with V. Vavilov of Tomsk Polytechnic, have demonstrated a capability of carrying out thermal wave tomography. We have recently extended this technique to real time with our system. We describe these recent developments and present several applications to the study of thickness variations and adhesion defects in coatings and composites.

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