Modelling of the frequency modulated thermal wave imaging process through the finite element method for non-destructive testing of a mild steel sample

Abstract

Frequency modulated thermal wave imaging involves mapping of the thermal response over the test sample for a given incident frequency modulated heat flux within a suitable band of frequencies that are launched into the sample from its surface. This contribution describes finite element analysis-based modelling for the characterisation of a mild steel sample with defects of different shapes using frequency modulated thermal wave imaging. The present work highlights the comparative results obtained from frequency and time domain phase analysis schemes adopted on the mean-removed generated temporal thermal data.