Abstract
Optical lock-in thermography is exploited for qualitative assessment of surface cracks in metallic samples. In order to identify and localize a surface defect, a special image processing of the recorded IR amplitude sequence is proposed. The obtained results demonstrate the potentiality of active lock-in thermography as a contactless measurement tool for localization of breaking cracks located into specific regions difficult to reach, and as a possible alternative to penetrant inspection in industrial processes.
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