College of Mechanical and Equipment Engineering, Hebei University of Engineering, Handan 056038, China.
Sensors (Basel). 2022 Jul 1;22(13):4985. doi: 10.3390/s22134985.
The low energy conversion efficiency of electromagnetic acoustic transducers (EMATs) is a critical issue in nondestructive testing applications. To overcome this shortcoming, a butterfly coil EMAT was developed and optimized by numerical simulation based on a 2-D finite element model. First, the effect of the structural parameters of the butterfly coil EMAT was investigated by orthogonal test theory. Then, a modified butterfly coil EMAT was designed that consists of three-square permanent magnets with opposite polarity (TSPM-OP) to enhance the signal amplitude. Finally, the signal amplitude obtained from the three types of EMATs, that is, the traditional EMAT, the EMAT optimized by orthogonal test theory, and the modified EMAT with TSPM-OP, were analyzed and compared. The results show that the signal amplitude achieved by the modified butterfly coil EMAT with TSPM-OP can be increased by 4.97 times compared to the traditional butterfly coil EMAT.
电磁声换能器（EMAT）的低能量转换效率是无损检测应用中的一个关键问题。为了克服这一缺点，基于二维有限元模型，通过数值模拟开发并优化了蝶形线圈 EMAT。首先，通过正交试验理论研究了蝶形线圈 EMAT 的结构参数的影响。然后，设计了一种由三个具有相反极性的正方形永磁体组成的改进蝶形线圈 EMAT（TSPM-OP），以增强信号幅度。最后，对三种 EMAT 的信号幅度进行了分析和比较，即传统 EMAT、基于正交试验理论优化的 EMAT 和采用 TSPM-OP 的改进 EMAT。结果表明，采用 TSPM-OP 的改进蝶形线圈 EMAT 的信号幅度比传统蝶形线圈 EMAT 增加了 4.97 倍。
