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Miniaturised SH EMATs for fast robotic screening of wall thinning in steel plates
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Trushkevych, Oksana, Tabatabaeipour, Morteza, Dixon, Steve M., Potter, Mark D. G., Dobie, Gordon, Macleod, Charles and Edwards, R. S. (Rachel S.) (2021) Miniaturised SH EMATs for fast robotic screening of wall thinning in steel plates. IEEE Sensors Journal, 21 (2). pp. 1386-1394. doi:10.1109/JSEN.2020.3021526 ISSN 1530-437X.
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Official URL: http://dx.doi.org/10.1109/JSEN.2020.3021526
Abstract
Electromagnetic acoustic transducers (EMATs) are well suited to generating and detecting a variety of different ultrasonic wavemodes, without the need for couplant, and they can be operated through some coatings. EMATs can be used to generate shear horizontal (SH) waves, which show promise for fast screening of wall thinning and other defects. However, commercial SH-wave EMATs are not suitable for robotic implementation on ferritic steel due to the large magnetic drag force from the magnets. This article describes the design and characterisation of miniaturised SH guided wave EMATs, which significantly reduce the magnetic drag and enable mounting onto a small crawler robot for sample scanning. The performance of the miniaturised EMATs is characterised and compared to a commercial EMAT. It is shown that signal to noise ratio is reduced, but remains within an acceptable range to use on steel. The bandwidth and directivity are increased, depending on the exact design used. Their ability to detect flat bottomed holes mimicking wall thinning is also tested.
Item Type: | Journal Article | ||||||||
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Subjects: | 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 |
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Library of Congress Subject Headings (LCSH): | Electroacoustic transducers, Ultrasonic welding, Robots, Industrial, Magnetostriction, Steel, Nondestructive testing | ||||||||
Journal or Publication Title: | IEEE Sensors Journal | ||||||||
Publisher: | Institute of Electrical and Electronic Engineers | ||||||||
ISSN: | 1530-437X | ||||||||
Official Date: | 15 January 2021 | ||||||||
Dates: |
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Volume: | 21 | ||||||||
Number: | 2 | ||||||||
Page Range: | pp. 1386-1394 | ||||||||
DOI: | 10.1109/JSEN.2020.3021526 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 11 January 2021 | ||||||||
Date of first compliant Open Access: | 11 January 2021 | ||||||||
RIOXX Funder/Project Grant: |
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