Signal Processing for Guided Waves Testing Based on MagnetostrictiveEffect
A design process for the signal processing method to the magnetostrictive guided waves testing instrument is investigated. The short time Fourier transform method is used to analyze the characteristic of the guided wave signal with a flaw in a pipe. Based on the characteristic of the signal, the software band pass filter is employed to processing the signal. The echoes of flaw show clearly in the signal by filtering. Then a hardware circuit is designed to realize the software filter. The performances of the two methods are compared. The result shows that the method based on the hardware filter can identify the flaws, locate the flaws quickly which is suitable for the real time inspection. The method based on the software filter can clearly recognize the response of the flaws which is feasible for the post-processing. Lastly, a design process for the signal processing method to the magnetostrictive guided waves testing instrument is given.
magnetostritive effect guided waves signal processing instrument
Jiang XU Xinjun WU Gongtian SHEN Liangyun WANG
School of Mechanical Science and Engineering Huazhong University of Science and Technology,Wuhan, 43 China Special Equipment Institute and Research College, Beijing 100013 P.R. China
国际会议
第十七届世界无损检测会议(17th World Conference on Nondestructive Testing)
上海
英文
943-948
2008-10-25（万方平台首次上网日期，不代表论文的发表时间）