球壳换能器电声效率测量方法及声场特性分析

在高强度聚焦超声治疗系统中，换能器的电声效率是治疗剂量控制中的重要参数，其在焦域附近的声场分布同样重要。该研究以球壳聚焦换能器为研究对象，基于辐射力天平法与平面扫描法进行输出声功率的测量，同时测量其激励电功率后计算得到电声效率，并就其声场特性分布以及存在的非线性传播现象进行了简单阐述。两种测量方法测得的电声效率在声学计量的误差允许范围内，实验结果表明两种方法在测量球壳聚焦换能器输出声功率时具备较好的一致性。

Research on measurement method of electroacoustic efficiency of spherical shell transducer and character analysis for acoustic field

In the high intensity focused ultrasound treatment system, the electroacoustic efficiency of the transducer is an important parameter in the treatment dose control, and its sound field distribution near the focal region is also important. In this study, the 1.12MHz spherical shell focused transducer is taken as the research object. The output acoustic power is measured based on the radiation force balance method and the plane scanning method. At the same time, the electroacoustic efficiency is calculated after measuring the excitation electric power, and its sound field characteristic distribution and nonlinear propagation phenomenon are briefly described. The electroacoustic efficiency measured by the two methods is within the allowable error range of acoustic measurement. The experimental results show that the two methods have good consistency in measuring the output acoustic power of spherical shell focusing transducer.