曲折线圈EMAT偏置磁场优化设计及其实验研究
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国家自然科学基金资助项目(No. 51705231, 51265044, 51705232); 江西省优势科技创新基金资助项目(20171BCB24008)

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Optimal Design and Experimental Study of Meander Coil EMAT Bias Magnetic Field
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    摘要:

    针对曲折线圈电磁超声换能器(EMAT)换能效率低的问题,建立了曲折线圈EMAT检测过程有限元模型,分析了3种常见的永磁体组合方式对EMAT换能效率的影响,研究了3种组合方式下永磁体几何参数对金属试样表层偏置磁感应强度的影响规律,并给出了偏置磁场强度最大时对应的永磁体最佳几何参数。为验证仿真结果,采用3种组合形式的永磁体制作EMAT探头,并在铝板中激励0.9 MHz表面波和2 MHz斜入射偏振剪切波(SV波)。研究结果表明,当永磁体宽度为EMAT曲折线圈宽度的0.8左右时,曲折线圈EMAT换能效率最高。改进U型永磁体组合可显著提高金属试样表面的偏置磁场强度。

    Abstract:

    To solve the problem of low transduction efficiency of the meander coil electromagnetic ultrasonic transducer (EMAT),a finite element model for the detection process of a meander coil EMAT was established.The effects of three common permanent magnet combinations on the conversion efficiency of EMAT were analyzed. The influences of geometric parameters of permanent magnets on the bias magnetic induction intensity of the surface of the metal specimens under three combinations was studied, and the optimal geometric parameters of permanent magnets corresponding to the maximum bias magnetic field strength were given.In order to verify the simulation results,the EMAT probes were fabricated by using three combinations of permanent magnets, and the surface waves with a frequency of 0.9 MHz and the angled incidence polarization shear waves (SV waves)with afrequency of 2 MHz were 〖JP2〗generated in an aluminum plate.The results show that when the width of the permanent magnet is about 0.8 of that of the meander coil EMAT,the meander coil EMAT transduction efficiency is the highest. The improved Ushaped permanent magnet combination can significantly increase the bias magnetic field strength in the metal specimen surface.

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刘勋丰,石文泽,卢超,陈尧,陈果,龙盛蓉.曲折线圈EMAT偏置磁场优化设计及其实验研究[J].压电与声光,2018,40(5):746-753. LIU Xunfeng, SHI Wenze, LU Chao, CHEN Yao, CHEN Guo, LONG Shengrong. Optimal Design and Experimental Study of Meander Coil EMAT Bias Magnetic Field[J]. PIEZOELECTRICS AND ACOUSTOOPTICS

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  • 在线发布日期: 2018-10-16
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