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Development of a new EMAT for multi-helical SH guided waves based on magnetostrictive effect

Wang, Zhe; Huang, Song. Ling; Wang, Shen; Wang, Qing; Zhao, Wei

Development of a new EMAT for multi-helical SH guided waves based on magnetostrictive effect Thumbnail


Authors

Song. Ling Huang

Wei Zhao



Abstract

Electromagnetic acoustic transducers (EMATs) have the advantage of non-contact and have been widely used in nondestructive testing (NDT). However, the propagation of the guided wave generated by present transducers is either concentrated with narrow beam directivity or omni-directional with disperse energy. To overcome these disadvantages, a new EMAT is proposed to generate multi-helical shear horizontal (MHSH) guided waves. The waves can propagate in multiple helical angles within a certain range while the energy is still concentrated. In this paper, the excitation and reception process of the guided wave are modeled based on the magnetostrictive effect, and then Finite Element Method (FEM) is applied to confirm the models and to further study the wave radiation pattern. Series of experiment are carried out to evaluate the performance of the proposed EMAT. Finally, the influences of two key design parameters on the beam divergence angle are discussed.

Citation

Wang, Z., Huang, S. L., Wang, S., Wang, Q., & Zhao, W. (2018). Development of a new EMAT for multi-helical SH guided waves based on magnetostrictive effect. In 2018 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) : 14-17 May 2018, Houston, Texas, USA ; proceedings (1279-1284). https://doi.org/10.1109/i2mtc.2018.8409576

Conference Name 2018 IEEE International Instrumentation and Measurement Technology Conference
Conference Location Houston, TX, USA
Start Date May 14, 2018
End Date May 17, 2018
Acceptance Date May 14, 2018
Online Publication Date Jul 12, 2018
Publication Date Jul 12, 2018
Deposit Date Jul 18, 2018
Publicly Available Date Jul 19, 2018
Publisher Institute of Electrical and Electronics Engineers
Pages 1279-1284
Book Title 2018 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) : 14-17 May 2018, Houston, Texas, USA ; proceedings.
ISBN 9781538622230
DOI https://doi.org/10.1109/i2mtc.2018.8409576
Publisher URL https://ieeexplore.ieee.org/document/8409576/

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