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%.
出处
《应用声学》
CSCD
1996年第4期6-9,46,共5页
Journal of Applied Acoustics
关键词
超声功率
测量
互易校准
声功率
Ultrasonic power measurement, Self-reciprocity calibration, Transmitting current response
