Volume 31 Issue 10
Oct.  2005
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Guo Xingwang, Liu Yingtao, Guo Guangping, et al. Pulsed phase thermography and its application in the NDT of composite materials[J]. Journal of Beijing University of Aeronautics and Astronautics, 2005, 31(10): 1049-1053. (in Chinese)
Citation: Guo Xingwang, Liu Yingtao, Guo Guangping, et al. Pulsed phase thermography and its application in the NDT of composite materials[J]. Journal of Beijing University of Aeronautics and Astronautics, 2005, 31(10): 1049-1053. (in Chinese)

Pulsed phase thermography and its application in the NDT of composite materials

  • Received Date: 28 Jun 2004
  • Publish Date: 31 Oct 2005
  • To suppress various interference and increase the detection capability of pulsed thermography for defect inspection of composite materials, PPT (pulsed phase thermography) based on FFT(fast Fourier transform) for the time history of each pixel and its application to composite structures were studied. The principle of PPT for processing pulsed thermographic data was described; the problems of frequency domain aliasing and frequency spectrum leakage in the signal processing were discussed. A PPT experiment was made on a carbon fibre reinforced plastic sample, and the image processing effects were quantitatively compared by the signal-to-noise ratio. The experimental results show that PPT not only has the advantages of rapid image acquisition, less sensitivity to inhomogeneities of surface heating, non-necessity to know a prior position of a sound area, but also has good robustness to random noise and greater signal-to-noise ratio, so it is an effective method for NDT & E (nondestructive testing and evaluation) of composite structures.

     

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