Abstract:
Active infrared imaging is one of the promising remote and whole field
characterisation techniques for non-destructive testing and evaluation
of various solids irrespective of their electrical and magnetic prosperities. This technique relies on a mapping of thermal response for a predefined incident heat flux over the test object to detect the presence of
surface and subsurface anomalies. Due to its fast, non-contact, safe and
quantitative testing capabilities, infrared thermography has gained significant importance in the testing of fibre reinforced polymers. This
Letter highlights testing and evaluation of glass fibre-reinforced
polymer (GFRP) specimen for detection of subsurface hidden defects
using pulse compression favourable thermal wave imaging techniques
(for an imposed digitised chirp as well as a 7-bit Barker coded
modulated heat fluxes over the test specimen). Further depth scanning
capabilities of the proposed schemes have been compared using a timedomain pulse compression based approach. Proposed analytical, as
well as simulation studies, have been validated with the experimental
results on GFRP material having flat bottom holes as defects.
