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Thermoelastic laser generated ultrasound using a ring source
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Dixon, S., Harrison, T., Fan, Yichao and Petcher, P. A. (2012) Thermoelastic laser generated ultrasound using a ring source. Journal of Physics D: Applied Physics, Vol.45 (No.17). Article no. 175103. doi:10.1088/0022-3727/45/17/175103 ISSN 0022-3727.
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Official URL: http://dx.doi.org/10.1088/0022-3727/45/17/175103
Abstract
A pulsed Nd : YAG laser is focused to a sharp ring on an aluminium sample in the thermoelastic regime. This is achieved by firstly expanding the collimated laser beam before passing it through a bi-convex lens and an axicon lens. The addition of the extra convex lens provides a significant focusing improvement. On thick samples, this shape of acoustic source generates simultaneously a surface Rayleigh wave and bulk waves. The surface waves generated by the ring source travel outwards from the ring and also inwards to focus at a point in the centre of the ring. Large amplitude Rayleigh waves are thus generated at the centre of the ring. The absolute, out-of-plane displacement caused by the acoustic waves travelling along a sample surface is measured using a Michelson interferometer with a bandwidth of approximately 80 MHz. The experimental results have been correlated with those obtained by numerical modelling to show good agreement and less successfully with finite element modelling. The ring acoustic source has various applications for defect detection and measurement, and material characterization.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Journal of Physics D: Applied Physics | ||||
| Publisher: | IOP Publishing | ||||
| ISSN: | 0022-3727 | ||||
| Official Date: | 2012 | ||||
| Dates: |
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| Volume: | Vol.45 | ||||
| Number: | No.17 | ||||
| Page Range: | Article no. 175103 | ||||
| DOI: | 10.1088/0022-3727/45/17/175103 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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