Jian, X., Dixon, S. and Edwards, R. S. (Rachel S.) (2005) Optimising ultrasonic wideband Rayleigh wave generation by pulsed electromagnetic coils. NONDESTRUCTIVE TESTING AND EVALUATION, 20 (1). pp. 43-62. doi:10.1080/10589750500033988

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Abstract

Transient ultrasonic Rayleigh wave generation by pulsed electromagnetic coils operating via the Lorentz force mechanism is investigated. Optimal coil design is calculated by considering the entire ultrasonic generation system including the pulse generator, coil shape and size, and the electromagnetic coupling between coil and metal sample. The study is carried out through theoretical modelling and comparison with experimental measurements taken using an 80 MHz bandwidth Michelson laser interferometer as a detector. The time dependent Lorentz force generated by the electromagnetic acoustic transducer (EMAT) is modelled using finite element calculations, and the resultant ultrasonic field is calculated using an efficient numerical algorithm. Excellent correlation is observed between the simulated waveforms and experimental measurements. This demonstrates how the approach reported here will greatly assist in optimising the design of generating EMAT for specific applications.

Item Type:	Journal Article
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Journal or Publication Title:	NONDESTRUCTIVE TESTING AND EVALUATION
Publisher:	TAYLOR & FRANCIS LTD
ISSN:	1058-9759
Official Date:	March 2005
Dates:	Date Event March 2005 UNSPECIFIED
Volume:	20
Number:	1
Number of Pages:	20
Page Range:	pp. 43-62
DOI:	10.1080/10589750500033988
Publication Status:	Published

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