点聚焦表面波EMAT声场特性及其试验
Sound Field Characteristics of a Focused Rayleigh Wave EMAT and Its Experimental Research
摘 要
针对曲折线圈电磁超声换能器（EMAT）换能效率和信噪比低的问题，建立了点聚焦EMAT的三维声场有限元模型，通过瞬态和稳态分析，分析了激励频率、线圈匝数和导线长度对点聚焦EMAT的声场聚焦特性以及缺陷回波特征的影响规律。搭建了0.5 MHz点聚焦EMAT检测系统，用于铝板中不同直径的圆孔检测，并与传统的曲折线圈EMAT进行对比。结果表明：采用点聚焦表面波EMAT，可以极大程度地提高信噪比和缺陷检测能力。
电磁超声
声场特性
信噪比
point-focused Rayleigh wave
EMAT
sound field characteristics
signal-to-noise ratio
Abstract
The conversion efficiency of a meander coil EMAT is extremely low. In order to solve the problem, a three-dimensional finite element model for the sound field of a focused Rayleigh wave EMAT was established. Based on the transient and steady-state analysis, effects of excitation frequency, coil turns and length of the coil conductor on focusing characteristics and reflection echoes of defects were discussed. A 0.5 MHz point-focused surface wave EMAT was developed to detect holes of various diameters in aluminum, and it was also compared to a traditional meander coil EMAT. Result shows that signal-to-noise ratio (SNR) and flaw detectability can be greatly enhanced by a point-focused Rayleigh wave EMAT.
中图分类号 TG115.28 DOI 10.11973/wsjc201810004
所属栏目 2018远东无损检测新技术论坛论文精选
基金项目 国家自然科学基金资助项目（51705231，51265044，51705232）；江西省优势科技创新基金资助项目（20171BCB24008）
收稿日期 2018/7/5
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备注陈巍巍(1995-),男,硕士研究生,主要从事电磁超声无损检测方法的研究
引用该论文: CHEN Weiwei,SHI Wenze,CHEN Yao,CHEN Guo,LONG Shengrong,LU Chao. Sound Field Characteristics of a Focused Rayleigh Wave EMAT and Its Experimental Research[J]. Nondestructive Testing, 2018, 40(10): 16～21
陈巍巍,石文泽,陈尧,陈果,龙盛蓉,卢超. 点聚焦表面波EMAT声场特性及其试验[J]. 无损检测, 2018, 40(10): 16～21
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参考文献
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【2】PETCHER P A, POTTER M D G, DIXON S. A new electromagnetic acoustic transducer (EMAT) design for operation on rail[J]. Non-Destr Test EvalInt, 2014,65:1-7.
【3】康磊. 用于铝板检测的电磁超声导波换能器优化设计技术研究[D]. 哈尔滨:哈尔滨工业大学, 2011.
【4】THRING C B, FAN Y, EDWARDS R S. Focused Rayleigh wave EMAT for characterisation of surface-breaking defects[J]. NDT & E International, 2016, 81:20-27.
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