Performance of time- and frequency-domain analysis techniques in flash thermographic inspection of monolithic and sandwich composite parts

In flash thermography, the diffusive and damped characteristics of thermal waves complicate the detection of small and deep defects. To enhance the defect detectability of the recorded thermographic data, many researchers have developed a large range of advanced post-processing techniques. Most of these techniques either analyse the data in time domain or in frequency domain, however, there is no clear consensus about the optimal processing ap-proach. In this contribution, an experimental comparison between several time- and frequency-domain analysis techniques is presented for the thermographic inspection of composite parts. In addition to laboratory coupon samples, also industrial composite components are investigated.

Publication year:2021

Accessibility:Open