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

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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:	Date Event July 2014 Published 29 March 2014 Available 20 March 2014 Accepted 2 October 2013 Submitted
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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