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Unidirectional shear horizontal wave generation with side-shifted periodic permanent magnets electromagnetic acoustic transducer
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Kubrusly, Alan C., Kang, Lei and Dixon, Steve M. (2020) Unidirectional shear horizontal wave generation with side-shifted periodic permanent magnets electromagnetic acoustic transducer. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 67 (12). pp. 2757-2760. doi:10.1109/TUFFC.2020.3027246
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WRAP-Unidirectional-shear-horizontal-wave-generation-side-shifted-periodic-permanent-magnets-electromagnetic-acoustic-transducer-Dixon-2020.pdf - Accepted Version - Requires a PDF viewer. Download (1312Kb) | Preview |
Official URL: http://dx.doi.org/10.1109/TUFFC.2020.3027246
Abstract
Periodic permanent magnet (PPM) array electromagnetic acoustic transducers (EMATs) can efficiently generate and receive shear horizontal (SH) ultrasonic waves. Conventional PPM EMATs typically generate waves which simultaneously propagate both forward and backward. This can complicate the received signals and make it difficult to locate the position of scatterers. Unidirectional generation of ultrasounds can be achieved if two ultrasonic sources are separated by a predefined distance and are excited with the proper delay. Relying on this principle, EMATs have been previously designed aiming to generate other modes of ultrasonic waves. The main challenge when extending this conception to an SH-wave EMAT is how to restrict each coil to its specific magnet array. We present the concept of a unidirectional SH EMAT consisting of two racetrack coils and two interlaced PPM arrays, that are slightly shifted sideways, in such a way that the generated wavefronts still properly interfere. The design was fabricated and experimentally evaluated in an aluminum plate generating the SH0 guided wave mode. The forward to backward generated wave ratio is above 20 dB and well agrees with finite element simulations.
| Item Type: | Journal Article | |||||||||
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| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) | |||||||||
| Divisions: | Faculty of Science > Physics | |||||||||
| Library of Congress Subject Headings (LCSH): | Ultrasonic testing -- Research, Acoustic emission testing , Electroacoustic transducers, Transducers, Electromagnetic testing | |||||||||
| Journal or Publication Title: | IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control | |||||||||
| Publisher: | IEEE | |||||||||
| ISSN: | 1525-8955 | |||||||||
| Official Date: | 28 September 2020 | |||||||||
| Dates: |
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| Volume: | 67 | |||||||||
| Number: | 12 | |||||||||
| Page Range: | pp. 2757-2760 | |||||||||
| DOI: | 10.1109/TUFFC.2020.3027246 | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | Published | |||||||||
| Publisher Statement: | © 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. | |||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||
| RIOXX Funder/Project Grant: |
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