Study on Multi-resolution De-noising of Ultrasonic Signal From MMCs Using Wavelet Transform

摘要

There is a critical problem in ultrasonic testing, that is to say, the noise in echo signal in ultrasonic testing is sometimes very difficult to eliminate. The measured noise is ubiquitous in data signal collection. A method based on wavelet transform according to the characteristics of ultrasonic flaw echoes from compound material was put forward for signal denoising in ultrasonic testing. Experimental results showed that noises were depressesd effectively, SNR was improved obviously, and flaw was located accurately.