一种基于互易原理的超声功率新测量方法  

A new measurement method of ultrasonic power based on reciprocity principle

作　　者：寿文德[1] 

机构地区：[1]上海交通大学仪器工程系,上海200030

出　　处：《应用声学》1996年第4期6-9,46,共5页Journal of Applied Acoustics

摘　　要：本文从换能器的互易原理出发，利用平面波自易校准法获得换能器的自由场发送电流响应．根据平面活塞型换能器的衍射规律，推导出发射声功率的表达式．由此计算互易换能器在给定驱动电流（或电压）作用下的辐射超声功率．基于上述原理，使用自易校准装置测量了互易换能器的声功率一频率曲线．估计的测量不确定优于±20％．A new measurement method of ultrasonic power has been developed in Shanghai Jiaotong University. The free field transmitting current response of a transducer can be obtained by using the method of plane wave self-reciprocity calibration- In accordance with the diffraction field property of a plane piston transducer, the transmitting acoustic power formula is derived to calculate the radiation ultrasonic power of the reciprocal transducer under a given driving current or voltage. The measuring arrangement and procedure are explained. The acoustic power versus frequency of a reciprocal transducer is given.The estimated measuring uncertainty of this method is ±20%.

关 键 词：超声功率 测量 互易校准 声功率 

分 类 号：TB521[理学—物理]