基于1-3压电复合材料宽带超声换能器研究  

Study on Wide Bandwidth Ultrasound Transducer Based on 1-3 Piezoelectric Composite

作　　者：高伟宸 曾涛 罗曼 苏纯珍 曾德平[1] GAO Weichen;ZENG Tao;LUO Man;SU Chunzhen;ZENG Deping(State Key Laboratory of Ultrasound in Medicine and Engineering,Chongqing Key Laboratory of Biomedical Engineering,College of Biomedical Engineering,Chongqing Medical University,Chongqing 400016,China;Chongqing Ronghai Ultrasound Medical Engineering Research Center Co.,Ltd,Chongqing 400714,China)

机构地区：[1]重庆医科大学生物医学工程学院,超声医学工程国家重点实验室,重庆市生物医学工程学重点实验室,重庆400016 [2]重庆融海超声医学工程研究中心有限公司,重庆400714

出　　处：《压电与声光》2023年第4期607-613,共7页Piezoelectrics & Acoustooptics

基　　金：重庆市教委科学技术研究项目资助“成渝地区双城经济圈建设”科技创新基金资助项目(KJCXZD2020022)。

摘　　要：电声转换效率与换能器带宽是评价聚焦超声换能器性能的重要指标。传统压电陶瓷制备的聚焦超声换能器,其电声转换效率与换能器带宽偏低。该文采用实验结合仿真模拟的方式,通过研究1-3压电复合材料中压电相的体积比、环氧相改性、调控匹配层阻抗与匹配层厚度对换能器性能的影响,开发了一种基于1-3压电复合材料的聚焦超声换能器,实现了82.3%的电声转换效率与140 kHz的换能器带宽。结果表明,与同等规格的传统压电陶瓷聚焦超声换能器相比,该超声换能器的两项指标分别提升了105%与250%,这为大功率聚焦超声换能器的设计开发提供了参考与指导。The electro-acoustic conversion efficiency and transducer bandwidth are important indicators for evaluating the performance of focused ultrasound transducers.The traditional piezoelectric ceramic-based focused ultrasound transducers generally exhibit low electro-acoustic conversion efficiency and transducer bandwidth.In response to the above situation,a focused ultrasound transducer based on 1-3 piezoelectric composite is developed by using experimental and simulation methods to study the effects of the volume fraction of the piezoelectric phase in 1-3 piezoelectric composite,modification of the epoxy phase,adjustment of the matching layer impedance and thickness on the performance of the transducer.An electro-acoustic conversion efficiency of 82.3%and a transducer bandwidth of 140 kHz are achieved.The results show that compared with traditional piezoelectric ceramic-based focused ultrasound transducers,the two specifications of electro-acoustic conversion efficiency and bandwidth have been improved by 105%and 250%,respectively,which provides reference and guidance for the design and development of high-power focused ultrasound transducers.

关 键 词：1-3压电复合材料 聚焦超声换能器 电声转换效率 换能器带宽 匹配层 

分 类 号：TN384[电子电信—物理电子学] TB552[理学—物理]