Method and experiment for improving signal of EMAT for SH wave

BA Hong; WU Xin-jun; WANG Xue-yu; WANG Li

doi:10.13873/j.1000-97872012.08.042

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Method and experiment for improving signal of EMAT for SH wave

更新时间：2025-09-11

- Method and experiment for improving signal of EMAT for SH wave
- Vol. 31, Issue 8, Pages: 34-36+39(2012)
- 作者机构：
  
  华中科技大学机械科学与工程学院
- 作者简介：
- 基金信息：
- DOI：10.13873/j.1000-97872012.08.042
  CLC： TP212.1
- Published：2012
- 稿件说明：
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[1]巴洪,武新军,王学宇,王丽.增强SH波电磁超声传感器信号的方法与实验[J].传感器与微系统,2012,31(08):34-36+39.

BA Hong, WU Xin-jun, WANG Xue-yu, et al. Method and experiment for improving signal of EMAT for SH wave[J]. 2012, 31(8): 34-36+39.
[1]巴洪,武新军,王学宇,王丽.增强SH波电磁超声传感器信号的方法与实验[J].传感器与微系统,2012,31(08):34-36+39. DOI： 10.13873/j.1000-97872012.08.042.

BA Hong, WU Xin-jun, WANG Xue-yu, et al. Method and experiment for improving signal of EMAT for SH wave[J]. 2012, 31(8): 34-36+39. DOI： 10.13873/j.1000-97872012.08.042.

摘要

电磁超声传感器技术作为一种非接触无损测量方法

可用于恶劣工况的无损检测

尤其是可以实现水平剪切（SH）波的激励和接收。基于磁致伸缩效应的常规SH波电磁超声传感器信号较弱

为得到较强SH信号

改善信噪比

提出了一种增强电磁超声传感器信号的方法。该方法是在主永久磁铁闭合磁路上施加辅助永久磁铁

提高电磁超声线圈下部构件磁化强度

从而增强信号。实验证明:此方法可以使信号得到明显增强

并且有助于提高缺陷检测能力。

Abstract

Electromagnetic acoustic transducer（EMAT） technology is a non-contact nondestructive testing method which can be used under harsh condition.The driving and receiving of shear horizontal（SH） wave can be implemented by EMAT.The conventional EMAT for SH wave is based on magnetostrictive effect

but its signal is weak.In order to obtain stronger SH wave signals and improve the signal-to-noise ratio

a method to enhance the EMAT signal is presented.The additional permanent magnets are added to the closed magnetic circuit of the main permanent magnets to improve the magnetization in the specimen under the EMAT coil

so the signal amplitude is improved significantly.Experiment verifies that this method is beneficial to increase the signal amplitude

and thereby improving the detectability.

关键词

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references

电磁超声（EMA）技术的发展与应用 [J]. 李振才. 无损探伤 . 2006(06)

Lamb波与SH板波双模式电磁超声检测系统的设计与实验 [J]. 张志钢,阙沛文,雷华明. 工业仪表与自动化装置 . 2005(05)

弹性层中的SH板波传播特性及电磁超声激励方法的研究 [J]. 张志钢,阙沛文,雷华明. 传感技术学报 . 2005(02)

电磁超声SH波技术钢板自动检测方法及其装置 [P]. 王淑娟,康磊,李智超,蒋韬,苏日亮,梁轩瑞,翟国富. 中国专利:CN101393171,

Driving mechanism on magnetostrictive type electromagnetic acoustic transducer for symmetrical vertical-mode Lamb wave and for shear horizontal-mode plate wave [J] . Riichi Murayama. Ultrasonics . 1996 (7)

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