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Quantitative subsurface analysis using frequency modulated thermal wave imaging
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DOI：10.1016/j.infrared.2017.10.009.png)
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Quantitative depth analysis of the anomaly with an enhanced depth resolution is a challenging task towards the estimation of depth of the subsurface anomaly using thermography. Frequency modulated thermal wave imaging introduced earlier provides a complete depth scanning of the object by stimulating it with a suitable band of frequencies and further analyzing the subsequent thermal response using a suitable post processing approach to resolve subsurface details. But conventional Fourier transform based methods used for post processing unscramble the frequencies with a limited frequency resolution and contribute for a finite depth resolution. Spectral zooming provided by chirp z transform facilitates enhanced frequency resolution which can further improves the depth resolution to axially explore finest subsurface features. Quantitative depth analysis with this augmented depth resolution is proposed to provide a closest estimate to the actual depth of subsurface anomaly. This manuscript experimentally validates this enhanced depth resolution using non stationary thermal wave imaging and offers an ever first and unique solution for quantitative depth estimation in frequency modulated thermal wave imaging. (C) 2017 Elsevier B.V. All rights reserved.
Keyword:
Chirp Z transform
Spectral zooming
Depth resolution
Frequency modulated thermal wave imaging
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Theory of frequency modulated thermal wave imaging for nondestructive subsurface defect detection
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