Journal
INSIGHT
Volume 52, Issue 9, Pages 475-480Publisher
BRITISH INST NON-DESTRUCTIVE TESTING
DOI: 10.1784/insi.2010.52.9.475
Keywords
Infrared thermography; thermal waves; non-stationary signals; phase images; pulse compression; correlation; non-destructive testing
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Active thermal non-destructive testing (TNDT) methods utilise an acquired surface temperature profile over the object and subsequently process the obtained temperature data to detect surface or sub-surface features of the object. Presently, two phase-based conventional active TNDT methods are predominantly in use: pulsed phase thermograph), (PPT) and modulated lock-in thermograph), (LT). This paper highlights correlation processing-based detection capabilities of frequency modulated thermal wave imaging techniques through finite element modelling and simulations on a steel sample having flat-bottom blind holes as defects. The present work proposes a finite element-based simulation for comparison of the widely-used conventional thermal imaging methods (PPT and LT) with. more recently proposed non-stationary excitation approaches for non-destructive characterisation.
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