Lamb wave signal selective enhancement by an improved design of meander-coil electromagnetic acoustic transducer Project supported by the National Natural Science Foundation of China (Grant Nos. 51507171 and 51577184)

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...

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Bibliographic Details
Published inChinese physics B Vol. 27; no. 8
Main Authors Sun, Wen-Xiu, Liu, Guo-Qiang, Xia, Hui, Xia, Zheng-Wu
Format Journal Article
LanguageEnglish
Published Chinese Physical Society and IOP Publishing Ltd 01.08.2018
Subjects
electromagnetic acoustic transducer (EMAT)
Lamb wave
meander-coil
selective enhancement
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Summary: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.
ISSN:1674-1056
DOI:10.1088/1674-1056/27/8/084301