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Application of adaptive time-frequency decomposition in ultrasonic NDE of highly-scattering materials
1Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, People's Republic of China. paslab@nju.edu.cn
Ultrasonics
|January 11, 2000
Abstract:
In the paper, adaptive time-frequency decomposition by basis pursuit (BP) is utilized to improve ultrasonic flaw detection in highly-scattering materials as an alternative to the Wavelet Transform technique. The detection of ultrasonic pulses using the BP is described. Computer simulation was performed to verify the signal detection improvements for an ultrasonic wave embodied in white noise, and numerical results show good detection even for signal-noise ratio (SNR) of -18 dB. The improvement in detection is experimentally verified using cast steel samples with artificial flaws.