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Thermal Wave Imaging for Nondestructive Testing
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Dissertation
Thermal Wave Imaging for Nondestructive Testing
1990
Overview
Non-destructive testing using the technique of thermal wave imagine is a relatively recent innovation still out of define its useful boundaries. As a consequence this approach is still undergoing practical and theoretical development in the areas of; thermal wave detection, measurement techniques and applications.The work described in this thesis covers elements of all the above areas from the development of practical photoacoustic and photo thermal detectors to their use in thermal wave imaging experiments. These tests were performed on a wide range of coating materials (<1mm thick) including metals, polymers and ceramics detecting both changes in coating thickness and delamination’s. Imagine interpretation was significantly aided by swept frequency measurements which acted as an ideal method of detector characterization, sometimes allowing specimen thermal diffusivity to be accurate measured. This was even extended in a few situations to cover a direct comparison between theoretical and observed behavior. Attention was particularly focused on piezoelectric thermal wave detection which proved far more versatile than expected, dominating most of the work.
