中国物理B ›› 2018, Vol. 27 ›› Issue (8): 84301-084301.doi: 10.1088/1674-1056/27/8/084301
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
Wen-Xiu Sun(孙文秀), Guo-Qiang Liu(刘国强), Hui Xia(夏慧), Zheng-Wu Xia(夏正武)
Wen-Xiu Sun(孙文秀)1,2, Guo-Qiang Liu(刘国强)1,2, Hui Xia(夏慧)1, Zheng-Wu Xia(夏正武)1
摘要: In this paper, we investigate a method of selectively enhancing the single mode signal of a Lamb wave by using a meander-coil electromagnetic acoustic transducer (EMAT) with a new magnetic configuration. We use the Lamb antisymmetric (A0) mode and symmetric (S0) mode as an example for analysis. The analytical expression of the magnitude of the spatial Fourier transform of the Lorentz force generated by different meander coils is used to determine the optimal driving frequency for single mode generation. The numerical calculation is used to characterize the new magnetic configuration and the conventional EMAT magnet. Experimental examinations of each meander coil in combination with the conventional and new magnetic configuration show that the Lamb wave signal can be selectively enhanced by choosing the appropriate driving frequency and coil parameters through using the improved meander-coil EMAT.
中图分类号: (General linear acoustics)