Abstract
Infrared Thermography can be used to detect the subsurface defects in materials. This paper presents the results of Finite difference simulations of thermographs of (CFRP) Carbon Fiber Reinforced Plastics composite materials having Teflon inserts as defects. The inserts are assumed to be parallelepiped. The three dimensional parabolic heat conduction equation is solved and the temporal and spatial variation of signal and thermal contrast for defect situated at different depths are analyzed. The detectability window of the defects in terms of the number of the harmonic in the Fourier Transform spectra (both amplitude and phase) is identified. It has been observed that the phase images give better understanding of the defects in the composites.
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