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.
出处
《声学技术》
CSCD
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
关键词
球面聚焦
自易校准
衍射修正
辐射力天平
spherically focusing
self-reciprocity calibration
diffraction correction
radiation force balance(RFB)