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Analysis of wavelet de-noising for porosity inspection in carbon fiber reinforced composite

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1 Author(s)
Chenlong Yang ; Dept. of Mech. Eng., Zhejiang Univ., Hangzhou, China

The theory of wavelet denoising were studied in this paper. Daubechies wavelet, Symlet wavelet and Coiflets wavelets were used to de-noise the ultrasonic signals of carbon fiber reinforced composite. The results show that the de-noising results of different wavelets for the same signal are different, but they conform to a certain rule; the de-noising results of different signals also conform to a certain rule for the same wavelets. The relationship between ultrasonic attenuation and porosity was compared for original signals and de-noised signals, and the relationship for de-noised signals turned out to be closer to parabola relationship.

Published in:

Mechanic Automation and Control Engineering (MACE), 2011 Second International Conference on

Date of Conference:

15-17 July 2011