Side-shifted dual PPM EMATs with multiple rows of magnets and reduced lateral gap by flexible printed circuit board racetrack coils

Lucas M. Martinho; Alan C. Kubrusly; Iury S. Martins; Lei Kang; Steve Dixon

doi:10.1109/IUS54386.2022.9957580

Side-shifted dual PPM EMATs with multiple rows of magnets and reduced lateral gap by flexible printed circuit board racetrack coils

Lucas M. Martinho, Alan C. Kubrusly, Iury S. Martins, Lei Kang, Steve Dixon

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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Abstract

Shear horizontal (SH) guided waves can be generated by permanent magnet electromagnetic acoustic transducers (PPM EMATs). Conventional PPM EMATs generate waves that propagate both backwards and forwards. Recently, we presented designs of side-shifted PPM EMATs that generate SH waves in a single direction through the interference mechanism of two independent periodic sources of forces. These designs, however, can present unwanted backward side-lobes whose amplitude decreases as the lateral separation between rows of magnets shortens. Originally, the side-shift EMATs were fabricated with two hand-wound multi-lap racetrack coils. This process is time-consuming and hinders the possibility of short lateral separation between magnets' rows. In this paper, we present an alternative fabrication method for this design using flexible printed circuit boards that allow us to shorten the lateral separation, increase repeatability and, consequently, enhance the unidirectional behavior of the side-shifted dual-PPM EMAT.

Original language	English
Title of host publication	IUS 2022 - IEEE International Ultrasonics Symposium
Publisher	Institute of Electrical and Electronics Engineers Inc.
Number of pages	4
ISBN (Electronic)	9781665466578
ISBN (Print)	9781665478137
DOIs	https://doi.org/10.1109/IUS54386.2022.9957580
Publication status	Published - 1 Dec 2022
Event	2022 IEEE International Ultrasonics Symposium - Venice, Italy Duration: 10 Oct 2022 → 13 Oct 2022

Publication series

Name	IEEE International Ultrasonics Symposium, IUS
Volume	2022-October
ISSN (Print)	1948-5719
ISSN (Electronic)	1948-5727

Conference

Conference	2022 IEEE International Ultrasonics Symposium
Abbreviated title	IUS 2022
Country/Territory	Italy
City	Venice
Period	10/10/22 → 13/10/22

Keywords

dual-PPM EMATs
electromagnetic acoustic transducers
guided waves
PCB coils
radiation pattern
shear horizontal waves
unidirectional generation

Access to Document

10.1109/IUS54386.2022.9957580

Side-shifted dual PPM EMATs with multiple rows of magnets AAM
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Accepted author manuscript (Post-print), 1.95 MB

Cite this

Martinho, L. M., Kubrusly, A. C., Martins, I. S., Kang, L., & Dixon, S. (2022). Side-shifted dual PPM EMATs with multiple rows of magnets and reduced lateral gap by flexible printed circuit board racetrack coils. In IUS 2022 - IEEE International Ultrasonics Symposium (IEEE International Ultrasonics Symposium, IUS; Vol. 2022-October). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/IUS54386.2022.9957580

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title = "Side-shifted dual PPM EMATs with multiple rows of magnets and reduced lateral gap by flexible printed circuit board racetrack coils",

abstract = "Shear horizontal (SH) guided waves can be generated by permanent magnet electromagnetic acoustic transducers (PPM EMATs). Conventional PPM EMATs generate waves that propagate both backwards and forwards. Recently, we presented designs of side-shifted PPM EMATs that generate SH waves in a single direction through the interference mechanism of two independent periodic sources of forces. These designs, however, can present unwanted backward side-lobes whose amplitude decreases as the lateral separation between rows of magnets shortens. Originally, the side-shift EMATs were fabricated with two hand-wound multi-lap racetrack coils. This process is time-consuming and hinders the possibility of short lateral separation between magnets' rows. In this paper, we present an alternative fabrication method for this design using flexible printed circuit boards that allow us to shorten the lateral separation, increase repeatability and, consequently, enhance the unidirectional behavior of the side-shifted dual-PPM EMAT.",

keywords = "dual-PPM EMATs, electromagnetic acoustic transducers, guided waves, PCB coils, radiation pattern, shear horizontal waves, unidirectional generation",

author = "Martinho, {Lucas M.} and Kubrusly, {Alan C.} and Martins, {Iury S.} and Lei Kang and Steve Dixon",

note = "Funding Information: This work was supported in part by the Coordenac ao de Aperfeicoamento de Pessoal de N?vel Superior - Brasil (CAPES) - Finance Code 001, and the Carlos Chagas Filho Foundation for Research Support of Rio de Janeiro State (FAPERJ). Funding Information: This work was supported in part by the Coordenac¸{\~a}o de Aperfeic¸oamento de Pessoal de N{\'i}vel Superior – Brasil (CAPES) – Finance Code 001, and the Carlos Chagas Filho Foundation for Research Support of Rio de Janeiro State (FAPERJ). Publisher Copyright: {\textcopyright} 2022 IEEE.; 2022 IEEE International Ultrasonics Symposium, IUS 2022 ; Conference date: 10-10-2022 Through 13-10-2022",

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Martinho, LM, Kubrusly, AC, Martins, IS, Kang, L & Dixon, S 2022, Side-shifted dual PPM EMATs with multiple rows of magnets and reduced lateral gap by flexible printed circuit board racetrack coils. in IUS 2022 - IEEE International Ultrasonics Symposium. IEEE International Ultrasonics Symposium, IUS, vol. 2022-October, Institute of Electrical and Electronics Engineers Inc., 2022 IEEE International Ultrasonics Symposium, Venice, Italy, 10/10/22. https://doi.org/10.1109/IUS54386.2022.9957580

Side-shifted dual PPM EMATs with multiple rows of magnets and reduced lateral gap by flexible printed circuit board racetrack coils. / Martinho, Lucas M.; Kubrusly, Alan C.; Martins, Iury S. et al.
IUS 2022 - IEEE International Ultrasonics Symposium. Institute of Electrical and Electronics Engineers Inc., 2022. (IEEE International Ultrasonics Symposium, IUS; Vol. 2022-October).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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N1 - Funding Information: This work was supported in part by the Coordenac ao de Aperfeicoamento de Pessoal de N?vel Superior - Brasil (CAPES) - Finance Code 001, and the Carlos Chagas Filho Foundation for Research Support of Rio de Janeiro State (FAPERJ). Funding Information: This work was supported in part by the Coordenac¸ão de Aperfeic¸oamento de Pessoal de Nível Superior – Brasil (CAPES) – Finance Code 001, and the Carlos Chagas Filho Foundation for Research Support of Rio de Janeiro State (FAPERJ). Publisher Copyright: © 2022 IEEE.

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N2 - Shear horizontal (SH) guided waves can be generated by permanent magnet electromagnetic acoustic transducers (PPM EMATs). Conventional PPM EMATs generate waves that propagate both backwards and forwards. Recently, we presented designs of side-shifted PPM EMATs that generate SH waves in a single direction through the interference mechanism of two independent periodic sources of forces. These designs, however, can present unwanted backward side-lobes whose amplitude decreases as the lateral separation between rows of magnets shortens. Originally, the side-shift EMATs were fabricated with two hand-wound multi-lap racetrack coils. This process is time-consuming and hinders the possibility of short lateral separation between magnets' rows. In this paper, we present an alternative fabrication method for this design using flexible printed circuit boards that allow us to shorten the lateral separation, increase repeatability and, consequently, enhance the unidirectional behavior of the side-shifted dual-PPM EMAT.

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Martinho LM, Kubrusly AC, Martins IS, Kang L, Dixon S. Side-shifted dual PPM EMATs with multiple rows of magnets and reduced lateral gap by flexible printed circuit board racetrack coils. In IUS 2022 - IEEE International Ultrasonics Symposium. Institute of Electrical and Electronics Engineers Inc. 2022. (IEEE International Ultrasonics Symposium, IUS). doi: 10.1109/IUS54386.2022.9957580

Side-shifted dual PPM EMATs with multiple rows of magnets and reduced lateral gap by flexible printed circuit board racetrack coils

Abstract

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