基于磁致伸缩超声换能的偏置磁场设计仿真测试技术研究  

Simulation test technology of bias magnetic field design based on magnetostrictive ultrasonic energy exchange

作　　者：褚惟诚 魏艳龙 白渊铭 杨国权 梁海坚 CHU Weicheng;WEI Yanlong;BAI Yuanming;YANG Guoquan;LIANG Haijian(School of Computer Technology,Taiyuan Normal University,Jinzhong 030619,China;Department of Electronic Engineering,Taiyuan Institute of Technology,Taiyuan 030008,China)

机构地区：[1]太原师范学院计算机系,晋中030619 [2]太原工业学院电子工程系,太原030008

出　　处：《电子测试》2023年第2期15-21,共7页Electronic Test

基　　金：山西省青年科技研究项目(202203021212185);山西省青年科技研究项目(20210302123334)资助。

摘　　要：本文旨在研究偏置磁场大小及位置在磁致伸缩式换能器中的影响。通过介绍磁致伸缩换能器原理,设计磁致伸缩超声导波激励方案。选用直径1 mm的铁镓合金磁致伸缩材料作为测试波导,应用COMSOL有限元仿真软件对磁致伸缩效应与超声传播特性进行仿真,得出当永磁体距离线圈7 mm时,磁通密度约为1 T,此时换能器效率达到最大。最后,设计永磁体距离线圈0~9 mm时的超声激励实验,通过对比超声激励信号的幅值,验证永磁体位置为7 mm,磁通大小为1 T时,换能器效率达到最大,为进一步设计磁致伸缩式超声温度传感器奠定基础。The effect of the size and position of the bias magnetic field on magnetostrictive transducers is studied in this paper.By introducing the principle of magnetostrictive transducer,the excitation scheme of magnetostrictive ultrasonic guided wave is designed.Ferrogallium alloy magnetostrictive material with a diameter of 1mm was selected as the test waveguide,and the magnetostrictive effect and ultrasonic propagation characteristics were simulated by COMSOL finite element simulation software.It was found that when the distance between the permanent magnet and the coil was 7 mm,the magnetic flux density was about 1T,and the efficiency of the transducer reached the maximum.Finally,the ultrasonic excitation experiment is designed when the distance between the permanent magnet and the coil is 0 mm~9 mm.By comparing the amplitude of the ultrasonic excitation signal,it is verified that the efficiency of the transducer reaches the maximum when the position of the permanent magnet is 7 mm and the magnetic flux is 1 T.It lays a foundation for further design of magnetostrictive ultrasonic temperature sensor.

关 键 词：磁致伸缩 铁镓合金 永磁体 偏置磁场 COMSOL 

分 类 号：TB55[理学—物理]