【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。更多还原

【Abstract】 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,electro-acoustic efficiency,free-field transmitting voltage(current) response,free-field voltage sensitivity,effective area,effective 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 amplitude reflection coefficients in self-reciprocity calibration are given.The results show that the measurement principles and methods are available and feasible.更多还原