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Active thermography nondestructive inspection using cyclic heating and phase images obtained via the Fourier transform is performed for carbon fiber-reinforced plastic (CFRP) specimens, and the defect detection capability of this method is compared with that of the conventional thermography method using flash heating. The experimental results indicate that the defect detection capability is significantly improved when the frequency of the phase image is equal to the cyclic heating frequency. Compared with the flash heating method, a higher signal-to-noise ratio is observed in the phase images obtained via the cyclic heating method, although the temperature increase of the inspection object during heating is lower than that observed during flash heating. These results suggest that the proposed inspection method is effective for CFRPs and other resin-based materials.

Active thermography inspection of CFRP using cyclic heating and Fourier transform—comparison with flash heating method