| 增强SH波电磁超声传感器信号的方法与实验 |
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| 引用本文： | 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(8):34-36,39. |
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| 作者姓名： | 巴洪 武新军 王学宇 王丽 |
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| 作者单位： | 华中科技大学机械科学与工程学院,湖北 武汉,430074 |
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| 基金项目： | 国家"十二五"科技支撑计划资助项目，湖北省科技计划自然科学基金资助项目 |
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| 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。
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| 关 键 词： | 电磁超声传感器 无损检测 水平剪切波 磁致伸缩效应 |
Method and experiment for improving signal of EMAT for SH wave |
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| BA Hong
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WU Xin-jun
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WANG Xue-yu
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WANG Li.Method and experiment for improving signal of EMAT for SH wave[J].Transducer and Microsystem Technology,2012,31(8):34-36,39. |
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| Authors: | BA Hong WU Xin-jun WANG Xue-yu WANG Li |
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| Affiliation: | (School of Mechanical Science and Engineering,Huazhong University of Science and Technology, Wuhan 430074,China) |
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| 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. |
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| Keywords: | electromagnetic acoustic transducer(EMAT) nondestructive testing shear horizontal(SH) wave magnetostrictive effect |
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