换能器匹配层参数的选定  

The parameters selection of matching layer of ultrasonic transducers

作　　者：李珺[1] 张峰[1] 贺西平[1] 朱奕蔓[1] 

机构地区：[1]陕西师范大学应用声学研究所,陕西西安710062

出　　处：《陕西师范大学学报（自然科学版）》2009年第5期38-41,共4页Journal of Shaanxi Normal University：Natural Science Edition

基　　金：国家自然科学基金资助项目(10874102);陕西省自然科学基金资助项目(2007A07)

摘　　要：采用多层介质声透射模型,计算了超声换能器对水辐射时声能透射效率较高的匹配层匹配参数(特性阻抗和厚度).对计算结果与声能透射效果图进行分析表明,特性阻抗在压电陶瓷与工作介质之间时匹配层厚度最佳值为四分之一波长的整数倍,否则匹配层厚度取二分之一波长的整数倍.The parameters selection of matching layer of ultrasonic transducers is investigated. When ultrasonil transducers immerse into water, the ideal matching parameters of both the characteristic impedance and thickness are calculated in order to achieve the higher transmission efficiency of the transducers. According to the calculation results, when the value of characteristic impedance is between those of the piezoelectric ceramic and the working medium, the thickness of matching layer takes a quarter wavelength, otherwise the thickness of matching layer takes inteper times of a half wavelength.

关 键 词：匹配层 特性阻抗 厚度 声透射 

分 类 号：O426.4[理学—声学]