Abstract
This paper provides the theory, mathematics analysis and experiments in support of the Infrared thermal-wave inspection on the subsurface defects in a solid using linear frequency modulated light excitation (LFMTWI). The specimen is heated by the heat flux of linear frequency modulation for launching thermal-wave into the sample in a desired range of frequency. The more thermal wave responses characters are obtained, and the IR thermal-wave imaging shows much more advantages for subsurface defects detection. The simulation and experimental results from steel sample are presented in support of this technique.
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