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Design of a new type of omnidirectional shear-horizontal EMAT by the use of half-ring magnets and PCB technology
Ultrasonics ( IF 4.2 ) Pub Date : 2021-05-13 , DOI: 10.1016/j.ultras.2021.106465
Yinghong Zhang , Wenlong Liu , Nian Li , Zhenghua Qian , Bin Wang , Dianzi Liu , Xiangyu Li

In this paper, an electromagnetic acoustic transducer (EMAT) for generating and receiving omnidirectional shear-horizontal (OSH) wave in aluminum plate is developed. The proposed OSH-EMAT consists of a specially designed printed circuit board (PCB) coil and a pair of half-ring magnets. Vertical oriented static magnetic field and the radial alternative eddy current are applied to excite the Lorentz force along the circumferential direction. A three-dimensional finite element model has been established to simulate the distributions of the static magnetic flux, the eddy current, and the exciting process of SH wave. Further experimental results show that the proposed electromagnetic ultrasonic transducer has good consistency in the performance of omnidirectional excitation and reception. The new OSH-EMAT design has the potential for many non-destructive testing applications owing to its low cost, acceptable accuracy and convenient processing and fabrication.



中文翻译:

利用半环磁体和PCB技术设计新型的全方位水平剪切EMAT

本文开发了一种电磁声换能器(EMAT),用于在铝板上产生和接收全向水平剪切波(OSH)波。拟议的OSH-EMAT由专门设计的印刷电路板(PCB)线圈和一对半环磁体组成。施加垂直方向的静磁场和径向交流电来沿圆周方向激发洛伦兹力。建立了三维有限元模型来模拟静磁通量,涡流和SH波激发过程的分布。进一步的实验结果表明,所提出的电磁超声换能器在全向激励和接收性能方面具有良好的一致性。

更新日期:2021-05-18
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