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Oblique Point-Focusing Shear-Horizontal Guided-Wave Electromagnetic Acoustic Transducer With Variable PPM Spacing

Sun, Hongyu; Wang, Shen; Huang, Songling; Peng, Lisha; Wang, Qing; Zhao, Wei

Oblique Point-Focusing Shear-Horizontal Guided-Wave Electromagnetic Acoustic Transducer With Variable PPM Spacing Thumbnail


Authors

Hongyu Sun

Songling Huang

Lisha Peng

Wei Zhao



Abstract

We realized a phase-coherent oblique point-focusing shear-horizontal (SH) guided-wave electro- magnetic acoustic transducer (EMAT) composed of variable-spacing periodic permanent magnets (PPMs) and racetrack coils. For traditional focusing transducers, the necessary focal position adjustment in defect detection requires a redesign of the coil structure. More conveniently, this new transducer structure arrangement can achieve wave focusing and focal position change by rationally adjusting the layout of the PPM without changing the coil structure. Simulation results show that this newly designed transducer has good focusing performance: it can successfully focus the signal to a preset point, and the signal amplitude is nearly double that of the nonfocusing side. In addition, the focusing performance optimization of the transducer has been studied. The experimental results agree well with the actual location and size of a defect, which verifies the effectiveness of the newly designed focusing transducer in defect detection.

Citation

Sun, H., Wang, S., Huang, S., Peng, L., Wang, Q., & Zhao, W. (2020). Oblique Point-Focusing Shear-Horizontal Guided-Wave Electromagnetic Acoustic Transducer With Variable PPM Spacing. IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 67(8), 1691-1700. https://doi.org/10.1109/tuffc.2020.2980621

Journal Article Type Article
Acceptance Date Mar 9, 2020
Online Publication Date Mar 13, 2020
Publication Date 2020-08
Deposit Date Aug 18, 2020
Publicly Available Date Mar 28, 2024
Journal IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
Print ISSN 0885-3010
Electronic ISSN 1525-8955
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Volume 67
Issue 8
Pages 1691-1700
DOI https://doi.org/10.1109/tuffc.2020.2980621

Files

Accepted Journal Article (1.1 Mb)
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