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Proceedings Paper

Generation and detection of broadband laser generated ultrasound from low-power laser sources
Author(s): Kathryn Atherton; Brian Culshaw; Fengzhong Dong; Pan Jun; S. Gareth Pierce; Colin I. Swift
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Paper Abstract

This paper presents the basic principles of the laser generation of ultrasound (LGU) through thermal conversion and illustrates the approaches to its use in material evaluation using the broadband features of the source. Traditional LGU involves high energy optical pulse irradiation which often induces surface damage, especially in carbon or glass fiber composites. We therefore expand the concept into low power excitations using laser diode sources. This enables excitation without damage but requires coded temporal signals. Arrays of semiconductor laser sources can also produce very broadband acoustic signals, both temporally and spatially. Piezoelectric sources are usually the opposite constrained in both space and time. This basic observation opens new avenues of material investigation, some of which feature in this paper.

Paper Details

Date Published: 25 September 2001
PDF: 14 pages
Proc. SPIE 4417, Photonics 2000: International Conference on Fiber Optics and Photonics, (25 September 2001); doi: 10.1117/12.441302
Show Author Affiliations
Kathryn Atherton, Univ. of Strathclyde (United Kingdom)
Brian Culshaw, Univ. of Strathclyde (United Kingdom)
Fengzhong Dong, Univ. of Strathclyde (United Kingdom)
Pan Jun, Univ. of Strathclyde (United Kingdom)
S. Gareth Pierce, Univ. of Strathclyde (United Kingdom)
Colin I. Swift, Univ. of Strathclyde (United Kingdom)

Published in SPIE Proceedings Vol. 4417:
Photonics 2000: International Conference on Fiber Optics and Photonics

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