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Chin. Phys. B, 2018, Vol. 27(8): 084301    DOI: 10.1088/1674-1056/27/8/084301
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Lamb wave signal selective enhancement by an improved design of meander-coil electromagnetic acoustic transducer

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
1 Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 101408, China
Abstract  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.
Keywords:  Lamb wave      selective enhancement      meander-coil      electromagnetic acoustic transducer (EMAT)  
Received:  25 March 2018      Revised:  26 April 2018      Accepted manuscript online: 
PACS:  43.20.-f (General linear acoustics)  
  43.35.-c (Ultrasonics, quantum acoustics, and physical effects of sound)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51507171 and 51577184).
Corresponding Authors:  Guo-Qiang Liu     E-mail:  liuguoqiang@mail.iee.ac.cn

Cite this article: 

Wen-Xiu Sun(孙文秀), Guo-Qiang Liu(刘国强), Hui Xia(夏慧), Zheng-Wu Xia(夏正武) Lamb wave signal selective enhancement by an improved design of meander-coil electromagnetic acoustic transducer 2018 Chin. Phys. B 27 084301

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