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Enhancement of EMAT and eddy current using a ferrite back-plate

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Jian, X. and Dixon, S. (2007) Enhancement of EMAT and eddy current using a ferrite back-plate. Sensors and Actuators A: Physical, Vol.136 (No.1). pp. 132-136. doi:10.1016/j.sna.2006.10.028 ISSN 0924-4247.

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Official URL: http://dx.doi.org/10.1016/j.sna.2006.10.028

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Abstract

Electromagnetic acoustic transducers (EMATs) often have an electrically conducting surface behind the coil which we refer to as a back-plate, which could be there to act as an electromagnetic screen or could be a permanent magnet which is part of standard EMAT design. Eddy current probes can share many design features with EMATs, and both are designed to generate an eddy current in the electromagnetic skin-depth of a sample. In this paper we present an analytical solution for a quick and accurate calculation of the eddy current generated by a spiral coil and for the case of EMATs we also calculate the resultant Lorentz force which leads to ultrasonic generation. The Lorentz force can arise from an interaction of the eddy current with either a dynamic magnetic field from the coil or with a static magnetic field from a permanent of electromagnet. Theoretical predictions have shown that in the presence of a ferrite back-plate, the eddy current and the Lorentz force are enhanced greatly, and this has been verified experimentally. These developments will lead to improved EMAT and eddy current probe design. (C) 2006 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Journal or Publication Title: Sensors and Actuators A: Physical
Publisher: Elsevier Science BV
ISSN: 0924-4247
Official Date: 1 May 2007
Dates:
DateEvent
1 May 2007Published
Volume: Vol.136
Number: No.1
Number of Pages: 5
Page Range: pp. 132-136
DOI: 10.1016/j.sna.2006.10.028
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access

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