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High power phased EMAT arrays for nondestructive testing of as-cast steel

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Tkocz, Jozef, Greenshields, David and Dixon, Steve M. (2019) High power phased EMAT arrays for nondestructive testing of as-cast steel. NDT & E International, 102 . pp. 47-55. doi:10.1016/j.ndteint.2018.11.001 ISSN 0963-8695.

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Official URL: https://doi.org/10.1016/j.ndteint.2018.11.001

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Abstract

A new high-power electromagnetic acoustic transducer (EMAT) solid state pulser system has been developed that is capable of driving up to 4 EMAT coils with programmable phase delays, allowing for focusing and steering of the acoustic field. Each channel is capable of supplying an excitation current of up to 1.75 kA for a pulse with a rise time of 1 μs. Finite element and experimental data are presented which demonstrate a signal enhancement by a factor of 3.5 (compared to a single EMAT coil) when using the system to transmit a longitudinal ultrasound pulse through a 22.5 cm thick as-cast steel slab sample. Further signal enhancement is demonstrated through the use of an array of detection EMATs, and a demonstration of artificial internal defect detection is presented on a thick steel sample. The design of this system is such that it has the potential to be employed at elevated temperatures for diagnostic measurements of steel during the continuous casting process.

Item Type: Journal Article
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
T Technology > TS Manufactures
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Steel, Cast -- Nondestructive testing, Electroacoustic transducers -- Industrial applications
Journal or Publication Title: NDT & E International
Publisher: Elsevier Sci Ltd.
ISSN: 0963-8695
Official Date: March 2019
Dates:
DateEvent
March 2019Published
8 November 2018Available
2 November 2018Accepted
Volume: 102
Page Range: pp. 47-55
DOI: 10.1016/j.ndteint.2018.11.001
Status: Peer Reviewed
Publication Status: Published
Reuse Statement (publisher, data, author rights): © 2018, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/.
Access rights to Published version: Restricted or Subscription Access
Copyright Holders: Elsevier
Date of first compliant deposit: 7 November 2018
Date of first compliant Open Access: 12 November 2018
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIED[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
UNSPECIFIEDTata Steelhttp://dx.doi.org/10.13039/501100007220

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