球面聚焦超声换能器的电声特性和测量方法的研究  

Research on electroacoustic characteristics and measurements of spherically focusing transducer

作　　者：寿文德[1,2,3] 余立立[3] 段世梅[4] 朱厚卿[5] 杨平[6] 胡济民 卜书中 胡兵 

机构地区：[1]上海超声医学研究所,上海200233 [2]上海市第六人民医院,上海200233 [3]上海交通大学生物医学工程系,上海200030 [4]上海市食品药品监督管理局认证审评中心,上海200020 [5]中国科学院声学研究所,100190 [6]中国计量科学研究院,北京100013 [7]江苏省医疗器械检验所,南京210022 [8]昆山日盛电子有限公司,江苏昆山215321

出　　处：《声学技术》2013年第5期379-389,共11页Technical Acoustics

基　　金：国家标准项目(20112067-T-491);国家自然科学基金(81271597);上海市科学委员会基础研究重点项目(10 JC1412600);国家科技支持计划(2012 BA122 B00)资助

摘　　要：研究介绍了圆形孔径的球面聚焦压电换能器的基本电声参数:输出声功率、辐射电导、电声效率、自由场发射电流(电压)响应、自由场电压灵敏度、有效面积、有效孔径、声焦距、声束宽度和阻抗(导纳)等电声特性及其测量方法,详细地论述了基于辐射力天平法和自易校准法的测量原理和方法,讨论了它们的内在联系。给出了换能器自易校准中的衍射修正系数和平均反射系数的公式、计算方法和系列数据图表。试验结果表明了测量原理和方法的合理性和可行性。In the paper the electro-acoustic characteristics and measurement methods of spherically focusing transducer are studied. The relevant parameters and measurements including acoustic output power, radiation conductance, elec-tro-acoustic efficiency, free-field transmitting voltage (current) response, free-field voltage sensitivity, effective area, ef-fective aperture, acoustic focal length, beam width and electric impedance (admittance) are introduced. The methods based on RFB and self-reciprocity calibration are particularly described, and the relation between the two methods is discussed. The calculation methods with a set of table for the correction coefficients of diffraction and the average am-plitude reflection coefficients in self-reciprocity calibration are given. The results show that the measurement principles and methods are available and feasible.

关 键 词：球面聚焦 自易校准 衍射修正 辐射力天平 

分 类 号：TB559[理学—物理]