In this work, two different heat sources and two different thermographic techniques have been used to detect the adhesion defects among the base material and the coating. Moreover, an empirical thermographic method has been developed to evaluate the thickness of the thermal coating and to discriminate between an unevenness of the thickness and a defect zone. The study has been conducted on circular steel specimens with simulated adhesion defect and on specimens prepared with different thicknesses of thermal barrier coating.
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Davide Palumbo, Rosanna Tamborrino, Umberto Galietti, "Coating defect evaluation based on stimulated thermography," Proc. SPIE 10214, Thermosense: Thermal Infrared Applications XXXIX, 102140X (5 May 2017);