Dixon, S., Cann, B., Carroll, Donna L., Fan, Y. and Edwards, R. S. (Rachel S.). (2008) Non-linear enhancement of laser generated ultrasonic Rayleigh waves by cracks. Nondestructive Testing and Evaluation, Vol.23 (No.1). pp. 25-34. ISSN 1058-9759

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Abstract

Laser generated ultrasound has been widely used for detecting cracks, surface and sub-surface defects in many different materials. It provides a non-contact wideband excitation source which can be focused into different geometries. Previous workers have reported enhancement of the laser generated Rayleigh wave when a crack is illuminated by pulsed laser beam irradiation. We demonstrate that the enhancement observed is due to a combination of source truncation, the free boundary condition at the edge of the crack and interference effects. Generating a Rayleigh wave over a crack can lead to enhancement of the amplitude of the Rayleigh wave signal, a shift in the dominant frequency of the wideband Rayleigh wave and strong enhancement of the high frequency components of the Rayleigh wave.

Item Type:	Journal Article
Subjects:	T Technology > T Technology (General)
Divisions:	Faculty of Science > Engineering Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Rayleigh waves, Ultrasonic waves -- Industrial applications, Lasers, Surfaces (technology) -- Defects
Journal or Publication Title:	Nondestructive Testing and Evaluation
Publisher:	Taylor & Francis Ltd.
ISSN:	1058-9759
Date:	March 2008
Volume:	Vol.23
Number:	No.1
Number of Pages:	10
Page Range:	pp. 25-34
Identification Number:	10.1080/10589750701550640
Status:	Peer Reviewed
Access rights to Published version:	Open Access
URI:	http://wrap.warwick.ac.uk/id/eprint/457

Data sourced from Thomson Reuters' Web of Knowledge

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