Abstract
A nondestructive testing system that is especially well suited to NDE of bonds between coatings and substrates has been developed. It injects heat into the test specimen surface from a hot gas pulse and detects bond defects and other coating problems by means of an emissivity independent infrared scanning method. This method is very practical and has been proven in numerous demonstrations. It is the only method known by the authors to be applicable to such a wide variety of coatings. Qualitative correlation between bond strength and scan results from the system was demonstrated on one small group of test specimens. Due to its emissivity independence, the method yields results that are, in many cases, far superior to other infrared-thermal NDE methods. It can be applied to coatings having rough surfaces, and no physical contact with the test specimen is required.
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