Optimal frequency-to-bandwidth ratio of wavelet in ultrasonic non-destructive evaluation

The wavelet transform is the most recent technique for processing signals w ith time-varying spectra. The frequency-to-bandwidth ratio of wavelet is an important factor for getting success in the practical applications of the technique. In this paper, a theoretical model is presented to estimate the optimal frequency-to-bandwidth of the Gaussian wavelet in ultrasonic non-de structive evaluation. Then the experimental verification is performed, and the experimental results confirm the availability of the theoretical model. (C) 2001 Elsevier Science B.V. All rights reserved.