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

Research output not available from this repository, contact author.

Request Changes to record.

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:	Date Event 15 July 2007 Published
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

Request changes or add full text files to a record

Repository staff actions (login required)

View Item