Songling Huang
Numerical evaluation of focal position selection by line-focusing electromagnetic acoustic transducer with experimental validation
Huang, Songling; Sun, Hongyu; Wang, Shen; Wang, Qing; Zhao, Wei
Authors
Hongyu Sun
Dr Qing Wang qing.wang@durham.ac.uk
Associate Professor
Dr Qing Wang qing.wang@durham.ac.uk
Associate Professor
Wei Zhao
Abstract
As the focal position of a line-focusing electromagnetic acoustic transducer (LF-EMAT) affects the intensity of the focal signal, we measure the displacement signal and the selection method of the focal line position is then studied in this work to improve the signal intensity and detection precision for a shear-vertical (SV) wave LF-EMAT. We calculate the magnetostatics field and bulk wave propagation utilizing the finite element method (FEM). We simulate the characteristics of the SV wave, and we find that the radiant distance and propagation direction has a great influence on the amplitude of the displacement of the specimen. The superposition area of SV waves from different sources possesses better focusing ability, and the triangular area (normalized amplitude of the SV waves lower than 10%) near the surface of a specimen should be avoided to be chosen when designing the meander line coils. As for the line-focusing EMAT described in this manuscript, the selection of focal positions for different thickness specimens or detection depth is completely different. Moreover, we perform an experiment to validate the simulation results and lead to a conclusion that the position of the focal point is required to be appropriately close to the excitation coils to enhance the intensity of the signal, while the best focal position should be calculated.
Citation
Huang, S., Sun, H., Wang, S., Wang, Q., & Zhao, W. (2019). Numerical evaluation of focal position selection by line-focusing electromagnetic acoustic transducer with experimental validation. International Journal of Applied Electromagnetics and Mechanics, 61(3), 341-355. https://doi.org/10.3233/jae-190021
Journal Article Type | Article |
---|---|
Acceptance Date | Apr 25, 2019 |
Online Publication Date | Nov 11, 2019 |
Publication Date | Nov 11, 2019 |
Deposit Date | Jan 3, 2020 |
Publicly Available Date | Jan 3, 2020 |
Journal | International Journal of Applied Electromagnetics and Mechanics |
Print ISSN | 1383-5416 |
Publisher | IOS Press |
Peer Reviewed | Peer Reviewed |
Volume | 61 |
Issue | 3 |
Pages | 341-355 |
DOI | https://doi.org/10.3233/jae-190021 |
Files
Accepted Journal Article
(1.2 Mb)
PDF
Copyright Statement
The final publication is available at IOS Press through https://doi.org/10.3233/JAE-190021
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