Abstract
Pulsed thermal imaging is a commonly used infrared thermal imaging technology for nondestructive evaluation of engineering materials. It provides a complete interrogation and therefore a potentially complete quantification of the thermal properties of a test material. Two distinct applications have been pursued in the development of data/imaging processing methods: one for material property measurement and the other for flaw or discontinuity detection. For property measurement, theoretical models for one-and multi-layer materials are used to determine thickness-averaged material properties. For flaw detection, various image-processing methods are developed to enhance and extract the thermal contrast induced by subsurface flaw/discontinuities. This study examines the evolution of these methods and compares the differences of flaw-detection methods for detection and characterization of delamination flaws.
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