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Non-linear enhancement of laser generated ultrasonic Rayleigh waves by cracks
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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. doi:10.1080/10589750701550640 ISSN 1058-9759.
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Official URL: http://dx.doi.org/10.1080/10589750701550640
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 | ||||
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Subjects: | T Technology > T Technology (General) | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering Faculty of Science, Engineering and Medicine > Science > Physics |
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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 | ||||
Official Date: | March 2008 | ||||
Dates: |
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Volume: | Vol.23 | ||||
Number: | No.1 | ||||
Number of Pages: | 10 | ||||
Page Range: | pp. 25-34 | ||||
DOI: | 10.1080/10589750701550640 | ||||
Status: | Peer Reviewed | ||||
Access rights to Published version: | Open Access (Creative Commons) |
Data sourced from Thomson Reuters' Web of Knowledge
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