کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1759600 | 1019285 | 2009 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Signal-to-noise ratio enhancement based on wavelet filtering in ultrasonic testing Signal-to-noise ratio enhancement based on wavelet filtering in ultrasonic testing](/preview/png/1759600.png)
In ultrasonic non-destructive testing of materials with a coarse-grained structure the scattering from the grains causes backscattering noise, which masks flaw echoes in the measured signal. Several filtering methods have been proposed for improving the signal-to-noise ratio. In this paper we present a comparative study of methods based on the wavelet transform. Experiments with stationary, discrete and wavelet packet de-noising are evaluated by means of signal-to-noise ratio enhancement. Measured and simulated ultrasonic signals are used to verify the proposed de-noising methods. For comparison, we use signal-to-noise ratio enhancement related to fault echo amplitudes and filtering efficiency specific for ultrasonic signals. The best results in our setup were achieved with the wavelet packet de-noising method.
Journal: Ultrasonics - Volume 49, Issue 8, December 2009, Pages 752–759