Analysis of efficiency of EMAT surface wave transducer based on bias magnetic field
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摘要: 为提高常规EMAT(电磁超声)换能器效率,设计一种新型偏置磁场EMAT换能器。利用有限元软件建立EMAT激励表面波的二维仿真模型,对比分析常规和偏置EMAT对激励表面波的影响。最后设计正交试验研究磁铁高度、磁铁宽度、线圈高度、线圈宽度和线圈提离对偏置EMAT激励表面波的影响规律,并通过试验验证了其准确性,此外还研究了偏置磁铁对接收EMAT的影响。结果表明,偏置EMAT换能器激励的表面波幅值比常规EMAT的提高了51%,并且该方法不会在频域信息上发生主频分叉畸变问题,采用偏置EMAT接收的信号幅值比常规EMAT的提高了38%,偏置EMAT能有效提高检测灵敏度。
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关键词:
- 表面波电磁超声换能器 /
- 正交试验 /
- 换能效率 /
- 优化设计
Abstract: In order to improve the conversion efficiency of the conventional Electromagnetic Acoustic Transducer (EMAT) surface wave transducer, this paper proposes a new type of biased magnetic field EMAT transducer. A two-dimensional simulation model of EMAT excited surface wave is established using finite element software to compare and analyze the influence of conventional and biased EMAT on the excited surface wave. Finally, an orthogonal experiment is designed to study the influence of magnet height, magnet width, line height, line width, and coil lift on the excited surface wave of the biased EMAT. The accuracy of the orthogonal experiment was verified by experiment. In addition, the influence of biased magnet on the receiving EMAT was also studied. The research results showed that the amplitude of the excited surface wave of the biased EMAT was 51% higher than that of the conventional EMAT, and this method does not cause main frequency bifurcation distortion in the frequency domain information. The amplitude of the receiving signal using the biased EMAT was 38% higher than that of the conventional EMAT, and the biased EMAT can effectively improve the detection sensitivity. -
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