Research and application of ultrasonic signal detection based-on wavelet-time entropy
Ultrasonic signal detection is one kind of the non-destructive testing methods, and it can be non-destructive inspection of the internal defects of materials or mechanical components. One of the difficulties of ultrasonic signal detection is the detection of the echo signal in the ultrasonic signal. With the wavelet transform and Shannon entropy theory, the wavelet-time entropy algorithm is introduced in this paper. And the numerical simulations are carried out to prove the feasibility of this algorithm in abnormal signal detection. An improved wavelet-time entropy algorithm is put forward in this paper. The high-frequency coefficients of wavelet transform are replaced by the low-frequency coefficients, and the optimal width of window is worked out for actual ultrasonic signal. The results show that this improved wavelet-time entropy algorithm can effectively detect the echo signal in ultrasonic signal.
Ultrasonic signal Detection Wavelet transform Entropy Wavelet-time entropy
Zhao tingkai Ye qingwei Zhou yu
Information science and engineering college, Ningbo University, Ningbo 315211
国际会议
2009年中国控制与决策会议(2009 Chinese Control and Decision Conference)
广西桂林
英文
1618-1622
2009-06-17（万方平台首次上网日期，不代表论文的发表时间）