磁力可控电磁超声换能器设计及特性

doi:10.3901/JME.2021.02.046

机械工程学报 ›› 2021, Vol. 57 ›› Issue (2): 46-52.doi: 10.3901/JME.2021.02.046

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磁力可控电磁超声换能器设计及特性

涂君^1,2, 蔡卓越^1,2, 张旭^1,2, 宋小春^1,2

1. 湖北工业大学机械工程学院武汉 430068;
2. 现代制造质量工程湖北省重点实验室武汉 430068

收稿日期:2020-03-06 修回日期:2020-07-15 出版日期:2021-01-20 发布日期:2021-03-15
通讯作者: 涂君(通信作者),男,1983年出生,博士,副教授,硕士研究生导师。主要研究方向为电磁测量与传感、超声无损检测新技术。E-mail:Juntu@hbut.edu.cn
作者简介:蔡卓越,男,1995年出生。主要研究方向为电磁超声无损检测技术与应用。E-mail:zhuoyuecai@foxmail.com
基金资助:
国家自然科学基金（51707058，51807052）和湖北省自然科学基金（2019CFA021）资助项目。

Design and Characteristics of Electromagnetic Acoustic Transducers with Controllable Magnetic Force

TU Jun^1,2, CAI Zhuoyue^1,2, ZHANG Xu^1,2, SONG Xiaochun^1,2

1. School of Mechanical Engineering, Hubei University of Technology, Wuhan 430068;
2. Key Lab of Modern Manufacture Quality Engineering, Wuhan 430068

Received:2020-03-06 Revised:2020-07-15 Online:2021-01-20 Published:2021-03-15

摘要/Abstract

摘要： 电磁超声换能器一般采用具有超强磁力的稀土永磁制作，在实际检测中由于磁力不可控，存在偏置磁场不够强导致换能效率过低和磁力过强造成操作不方便等问题。提出一种偏置磁场磁力可控的电磁超声换能器，采用电磁铁与永磁铁相结合的方式，达到偏置磁场磁力可控的目的。通过有限元仿真和试验得出，提出的偏置磁场磁力可控的电磁超声换能器，在电磁铁处于关闭模式下，永磁铁能够提供基础磁场；采用增强模式或减弱模式，无被测物时，换能器下表面平均垂直磁通最大分别增强78.58%和减弱19.36%，而提离2 mm检测钢板时，换能器下方钢板表面平均垂直磁通最大分别增强52.99%和减弱38.02%；得出3种模式下，探头磁力随着提离距离缩小而增强的试验曲线；通过增强模式对铝板和钢板进行测厚试验，将检测信号幅值分别提高46.91%和62.01%。所设计的磁力可控电磁超声换能器不仅具有磁力可控的功能，还能够提高检测信号幅值。

关键词: 电磁超声, 偏置磁场, 磁力可控, 电磁铁, 永磁体

Abstract: Electromagnetic acoustic transducers(EMATs) is usually made of rare earth permanent magnet,which has the characteristics of super strong magnetic force. In actual testing,due to the uncontrollable magnetic force,there are some problems. Such as low energy conversion efficiency due to the insufficient bias magnetic field and inconvenient operation due to the excessive magnetic force. An electromagnetic ultrasonic transducer which can control the bias magnetic field and the magnetic force is presented. The proposed transducer can provide basic magnetic when electromagnetic is power off. In the reinforced or weakened mode,the average vertical flux on the lower surface of the transducer increased by 78.58% and decreased by 19.36% at most respectively and the average vertical flux of the steel plate under the transducer increased by 52.99% and decreased by 38.02% at most respectively when the steel plate is lifted 2 mm away. The experimental curves of probe magnetic force increasing with the decrease of lifting distance in three modes has been drawn. In the reinforced mode,the signal amplitude of thickness measurement for aluminum plate and steel plate is increased by 46.91% and 62.01% respectively. Based on the above research,the EMAT with controllable magnetic field not only has the function of controlling the magnetic force,but also can improve the amplitude of detection signal.

Key words: electromagnetic acoustic transducers(EMATs), bias magnetic field, controllable magnetic force, electromagnet, permanent magnet

中图分类号:

TB552

涂君, 蔡卓越, 张旭, 宋小春. 磁力可控电磁超声换能器设计及特性[J]. 机械工程学报, 2021, 57(2): 46-52.

TU Jun, CAI Zhuoyue, ZHANG Xu, SONG Xiaochun. Design and Characteristics of Electromagnetic Acoustic Transducers with Controllable Magnetic Force[J]. Journal of Mechanical Engineering, 2021, 57(2): 46-52.

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磁力可控电磁超声换能器设计及特性

Design and Characteristics of Electromagnetic Acoustic Transducers with Controllable Magnetic Force

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