Application and research of DSP in the portable air-leakage detector

This paper introduce the principle of the detection of high-pressure vessel’s air-leakage through ultrasonic, and the basic conception of wavelet transform. The feature extraction of ultrasonic signal based on wavelet package decomposition is also presented and the detailed arithmetic is given. In addition, the classific instrument by BP neural network is used to identify the ultrasonic signal with leakage.