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Published on: April 16, 2017
Active IR Thermography Evaluation of Coating Thickness by Determining Apparent Thermal Effusivity
Alexey Moskovchenko1,2, Vladimir Vavilov2,3, Michal Švantner1
1New Technologies-Research Centre, University of West Bohemia, Univerzitní 8, 301 00 Plzeň, Czech Republic.
Abstract:
Pulsed thermography is a common technique for nondestructive testing (NDT) of materials. This study presents the apparent effusivity method for the quantitative evaluation of coating thickness in a one-sided thermal NDT procedure. The proposed algorithm is based on determining a threshold value of apparent effusivity, which can be found for particular coating-on-substrate structures. It has been found that the square root of the time at which the apparent effusivity curve reaches this threshold is proportional to the coating thickness. The efficiency of the proposed approach is demonstrated by analytical modeling and experimentation performed on thermally-sprayed coatings.
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