Liang, Bao, Li, Zhichao, Zhai, Guofu, Yang, Runjie, Zhang, Xu and Dixon, Steve (2022) Enhancing the lift-off performance of EMATs by applying an Fe3O4 coating to a test specimen. IEEE Transactions on Instrumentation and Measurement, 72 . 9502104. doi:10.1109/tim.2022.3223076 ISSN 0018-9456.

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Abstract

Electromagnetic acoustic transducers (EMATs) are non-contact ultrasonic transducers. The transduction efficiency of a particular EMAT on a given specimen is dependent on the lift-off distance, which is the distance between the EMAT coil and the specimen surface. The transduction efficiency drops dramatically with increased lift-off distance, requiring EMATs to be in close proximity to the specimen, usually within a few millimetres. This paper proposes a new EMAT method of applying an Fe 3 O 4 coating to the test specimen, and quantitatively studying the enhancement effect of Fe 3 O 4 coating on lift-off distance. To eliminate the interference of the electrical and magnetic properties of the tested specimen, a non-magnetic and non-conductive glass specimen is selected. The experimental results on a glass substrate coated with Fe 3 O 4 demonstrate the feasibility of EMATs generating and receiving ultrasonic waves through the coating, by a magneto-elastic mechanism. The transduction efficiency of EMATs on an Fe 3 O 4 coating does not increase linearly with the bias static magnetic field, and the maximum measured signal amplitude value occurs at a relatively low flux density of ~0.12 T. More specifically, it has been shown the Fe 3 O 4 coating can significantly enhance the lift-off distance of EMATs operating at 4 MHz to 8 mm on coated stainless steel. The performance of the Fe 3 O 4 coating can be optimized, showing considerable potential to expand the application range of EMATs.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics T Technology > TA Engineering (General). Civil engineering (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:	Faculty of Science, Engineering and Medicine > Engineering > Engineering Faculty of Science, Engineering and Medicine > Science > Physics
SWORD Depositor:	Library Publications Router
Library of Congress Subject Headings (LCSH):	Electroacoustic transducers, Ultrasonic transducers, Iron oxides, Nondestructive testing, Ultrasonic testing, Electromagnetic testing
Journal or Publication Title:	IEEE Transactions on Instrumentation and Measurement
Publisher:	IEEE
ISSN:	0018-9456
Official Date:	17 November 2022
Dates:	Date Event 17 November 2022 Published 8 November 2022 Accepted
Volume:	72
Article Number:	9502104
DOI:	10.1109/tim.2022.3223076
Status:	Peer Reviewed
Publication Status:	Published
Reuse Statement (publisher, data, author rights):	© 2022 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
Copyright Holders:	IEEE
Date of first compliant deposit:	4 January 2023
Date of first compliant Open Access:	4 January 2023
RIOXX Funder/Project Grant:	Project/Grant ID RIOXX Funder Name Funder ID 51977044 [NSFC] National Natural Science Foundation of China http://dx.doi.org/10.13039/501100001809 51807052 [NSFC] National Natural Science Foundation of China http://dx.doi.org/10.13039/501100001809 JZKGJ20190004 Pre-Research Project for Civil Aerospace Technology UNSPECIFIED

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