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Non-linear enhancement of laser generated ultrasonic Rayleigh waves by cracks

By S. Dixon, B. Cann, Donna L. Carroll, Y. Fan and R. S. (Rachel S.) Edwards

Abstract

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

Topics: T1
Publisher: Taylor & Francis Ltd.
Year: 2008
OAI identifier: oai:wrap.warwick.ac.uk:457

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