考虑双向振动耦合效应的声发射传感器的分析  

Analysis of acoustic emission sensor considering coupling effect within double-direction

作　　者：焦阳[1] 杨庆新[1] 刘时风[2] 李光海[3] 

机构地区：[1]河北工业大学电磁场与电器可靠性省部共建重点实验室 [2]清华大学机械系,北京100084 [3]中国特种设备检测研究中心,北京100013

出　　处：《传感器与微系统》2007年第2期40-42,共3页Transducer and Microsystem Technologies

基　　金：河北省科技厅科技攻关计划资助项目(06213532)

摘　　要：由于声发射传感器属于低频超声传感器,其压电晶片工作频率决定了晶片的尺寸,使其不能简化为一维或二维弹性体来分析,考虑其径向和纵向振动不可忽视的耦合效应,借用表观弹性常数的定义,给出了短圆柱压电晶片包含直径和长度尺寸的频率方程。并根据频率方程制作了相应压电晶片,实验测试结果和理论预期相符。Acoustic emission （AE） sensor belongs to low frequency supersonic sensor. The work frequency of piezoelectric element of AE sensor determines its dimension characterstic. So it can＇t be treated as one-dimension or two-dimension elastomer for analysis. Considering coupling effect within dametral vibration and vertical vibration, making use of difination of apparent elastic coefficient, the frequency equation of short piezoelectric column that contains diameter and length is presented. According to the equation, corresponding piezoelectric element has been made. Through experiment, the testing results conform to theory expect.

关 键 词：声发射 传感器 耦合效应 频率方程 

分 类 号：TP216[自动化与计算机技术—检测技术与自动化装置]