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A new electromagnetic acoustic transducer (EMAT) design for operation on rail

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Petcher, P. A., Potter, M. D. G. and Dixon, Steve M. (2014) A new electromagnetic acoustic transducer (EMAT) design for operation on rail. NDT & E International, Volume 65 . pp. 1-7. doi:10.1016/j.ndteint.2014.03.007 ISSN 0963-8695.

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Official URL: http://dx.doi.org/10.1016/j.ndteint.2014.03.007

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Abstract

Electromagnetic acoustic transducers (EMATs) can emit and receive ultrasound on a conducting sample without contact, but are usually kept within 3 mm lift-off from the sample surface, to achieve a sufficient signal-to-noise ratio (SNR). There are scenarios under which EMATs must scan a sample at high speed, with the EMAT-sample separation varying by more than the standard lift-off range, such as for detection of gauge corner cracks in rail. A new EMAT has been designed that allows the low weight and flexible EMAT coil to skim over the sample surface, while the heavier and bulkier magnet behind the coil has a lift-off that can vary over 10 mm whilst still achieving a reasonable SNR. In experiments conducted with the EMATs mounted on a train, scanning a rail, they were demonstrated as being sufficiently robust, with an SNR sufficient for defect detection.

Item Type: Journal Article
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Journal or Publication Title: NDT & E International
Publisher: Elsevier Sci Ltd.
ISSN: 0963-8695
Official Date: July 2014
Dates:
DateEvent
July 2014Published
29 March 2014Available
20 March 2014Accepted
2 October 2013Submitted
Volume: Volume 65
Page Range: pp. 1-7
DOI: 10.1016/j.ndteint.2014.03.007
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access

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