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

CHEN Jinling;WANG Yuebing;ZHAO Peng;XING Guangzhen;LI Rongji;College of Metrology & Measurement Engineering, China Jiliang University;National Institute of Metrology;  
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 1.12 MHz 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.
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