小波变换和自适应噪声抵消在闭合裂纹超声检测中的应用  

Application of wavelet transform and adaptive noise canceling in ultrasonic closed-crack detection

作　　者：简晓明[1] 李明轩[1] 

机构地区：[1]中国科学院声学研究所,北京100080

出　　处：《声学学报》2000年第2期97-102,共6页Acta Acustica

基　　金：国家自然科学基金;中国科学院声学所研究所长基金

摘　　要：在闭合裂纹超声检测中，裂纹散射口波信号非常微弱，难以检测。本文分别用小波变换和自适应噪声抵消方法来抑制应电压背景噪声和随机电噪声，提高了信噪比，增强了裂纹检测率．Generally, when crack is closed perfectly under high pressure, the crack scattering echoes are too weak tobe detected easily. In this paper, Wavelet transform noise reduction and adaptive noise canceling methods are used tosuppress noise to enhance signal-to-noise ratio. By doing so3 the closed-Crack is detected more easily.

关 键 词：小波变换 自适应噪声抵消 裂纹 超声检测 

分 类 号：TB553[理学—物理]