层状介质界面超声检测的理论分析和自适应噪声抵消处理  

Ultrasonic interface detection of multilayers, theory and adaptive noise canceling processing

作　　者：简晓明[1] 李明轩[1] 张建生[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4期351-356,共6页Acta Acustica

基　　金：国家自然科学基金;中国科学院声学研究所所长基金

摘　　要：首先从理论上推导了展状介质超声脉冲回波的解析表达式，对各界面信号进行了分析。指出多层介质超声回波是各界面信号的叠加。应用自适应噪声抵消去除超声回波中的零界面和一界面信号，可以将二界面信号提取出来。对模拟和实测层状介质超声回波信号处理表明，方法是可行的。根据得到的二界面信号的幅度和起始时间，可以对二界面的深度和粘结情况进行评价。The analytic expression of received echo in multilayer NDT is derived first. From the analytic resolution,interface signals are analyzed. It is concluded that the received ultrasonic echo of multilayer is composed of all theinterface signals. Therefore, the second interface signal can be extracted by the adaptive canceling of the zero and flrstinterface signals. The processing effect to the ultrasonic echoes of simulation and real multilayer is pretty well. From theamplitude and arrival time of the second interface signals, the bond and the depth of the interface can be evaluated.

关 键 词：层状介质界面 超声检测 自适应噪声抵消 

分 类 号：O426[理学—声学]