Palmer, Stuart B., Jian, X. and Dixon, S. (2007) Eddy current enhancement for EMATs. In: Conference on Sensor Systems and Networks - Phenomena, Technology, and Applications for NDE and Health Monitoring 2007, San Diego, California, 19-21 Mar 2007. Published in: Sensor Systems and Networks: Phenomena, Technology, and Applications for NDE and Health Monitoring 2007, Volume 6530 p. 53013. ISBN 9780819466518. ISSN 0277-786X. doi:10.1117/12.715162

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Abstract

When an electromagnetic acoustic transducer (EMAT) is used to generate ultrasound in an electrically conducting sample, eddy currents are generated in the sample's skin depth as the first stage in transduction. The resultant acoustic wave amplitude is proportional to the amplitude of this eddy current, and so anything that we can do to increase the eddy current will lead to the generation of larger amplitude ultrasonic waves. In eddy current testing, wire coils are often wound onto a ferrite core to increase the generated eddy current, with the effect that inductance of the coil increases greatly. When we are dealing with an EMAT, any increase in the coil inductance is usually unacceptable as it leads to a reduction in the amplitude of a given frequency of eddy current from a limited voltage source. This is particularly relevant where current arises from capacitor discharge, as is typically used in EMAT driver current circuitry. We present a method for electromagnetic acoustic transduction where ferrite is used to increase eddy current amplitude, without significantly increasing coil inductance or changing the frequency content of the eddy current or the generated acoustic wave.

Item Type:	Conference Item (Paper)
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Series Name:	PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE)
Journal or Publication Title:	Sensor Systems and Networks: Phenomena, Technology, and Applications for NDE and Health Monitoring 2007
Publisher:	SPIE
ISBN:	9780819466518
ISSN:	0277-786X
Editor:	Peters, KJ
Official Date:	2007
Dates:	Date Event 2007 UNSPECIFIED
Volume:	Volume 6530
Number of Pages:	7
Page Range:	p. 53013
DOI:	10.1117/12.715162
Status:	Peer Reviewed
Publication Status:	Published
Conference Paper Type:	Paper
Title of Event:	Conference on Sensor Systems and Networks - Phenomena, Technology, and Applications for NDE and Health Monitoring 2007
Type of Event:	Conference
Location of Event:	San Diego, California
Date(s) of Event:	19-21 Mar 2007

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