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Effect on ultrasonic generation of a backplate in electromagnetic acoustic transducers

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Jian, Xiaoming, Dixon, S., Edwards, R. S. (Rachel S.), Quirk, K. and Baillie, Iain (2007) Effect on ultrasonic generation of a backplate in electromagnetic acoustic transducers. Journal of Applied Physics, Vol.102 (No.2). article no. 024909 . doi:10.1063/1.2756090

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Official URL: http://dx.doi.org/10.1063/1.2756090

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Abstract

When constructing an electromagnetic acoustic transducer (EMAT), it is often desirable to incorporate a permanent magnet behind the EMAT coil and an electrically conducting backplate between the coil and the magnet to prevent ultrasonic generation in the magnet by the current in the EMAT coil. This paper investigates the effect of the backplate on the generation of the eddy current and the resultant ultrasonic wave in the sample. We develop analytical expressions for the important physical phenomena and show that the backplate tends to reduce the amplitude of the eddy current and ultrasonic wave generated in the sample. This is dependent on the liftoff between the coil and the sample, and the air gap between the coil and the backplate. Results from modeling have been verified by our experimental measurements. (c) 2007 American Institute of Physics.

Item Type: Journal Article
Subjects: Q Science > QC Physics
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Science > Engineering
Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Ultrasonic waves, Electroacoustic transducers, Electromagnetism
Journal or Publication Title: Journal of Applied Physics
Publisher: American Institute of Physics
ISSN: 0021-8979
Official Date: 15 July 2007
Dates:
DateEvent
15 July 2007Published
Volume: Vol.102
Number: No.2
Number of Pages: 6
Page Range: article no. 024909
DOI: 10.1063/1.2756090
Status: Peer Reviewed
Publication Status: Published

Data sourced from Thomson Reuters' Web of Knowledge

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