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Orthonormal projection approach for depth-resolvable subsurface analysis in non-stationary thermal wave imaging

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Subsurface analysis using infrared imaging makes use of the temperature contrast originating from the perturbed propagation of diffusive thermal waves. Recently-proposed depth-resolvable modalities explore finer subsurface details and provide better depth scanning of the test object. This paper presents the application of a novel random orthonormal basis for detection and for resolving the subsurface anomalies located at various depths inside a carbon fibre-reinforced plastic specimen using recently-introduced quadratic frequency-modulated thermal wave imaging.
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Keywords: FOURIER TRANSFORM; INFRARED NON-DESTRUCTIVE TESTING (IRNDT); ORTHONORMAL BASIS; QUADRATIC FREQUENCY-MODULATED THERMAL WAVE IMAGING (QFMTWI); SUBSURFACE ANALYSIS

Document Type: Research Article

Publication date: January 1, 2016

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