Pulsed phased thermography with the wavelet transform

Galmiche, Franc¸ois; Maldague, Xavier; Valler, Steve; Couturier, Jean-Pierre
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p609
Academic Journal
Pulsed thermography (PT) is a well established approach in nondestructive evaluation of materials: a short thermal perturbation stimulates the specimen of interest and the subsequent surface temperature evolution reveals specimen subsurface structure and thermal properties. Recently, a novel analysis technique was proposed to process PT information, the pulsed phase thermography (PPT). This technique exploits the Fourier transform of the infrared images in order to analyze the thermal response of the specimen with distinct benefits. In this paper, the PPT technique is extended with the wavelet transform which is a powerful method of signal analysis bearing specific advantages with respect to the classic Fourier transform. Advantages and drawbacks of this extended PPT technique will be presented along with a brief theory of the wavelet transform and comparative experimental results. © 2000 American Institute of Physics.


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