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Proceedings Paper

Speckle noise reduction in laser vibrometry: experimental and numerical optimisation
Author(s): Matt Denman; Neil A. Halliwell; Steve J. Rothberg
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Paper Abstract

The range of potential applications of the Laser Doppler Vibrometer is significantly influenced by the behavior of the speckle pattern that is incident on the instrument's photodetector. A speckle pattern is formed when coherent laser light is scattered from an optically rough target. This paper investigates experimentally how photodetector size and position relative to the target can lead to noise floor reduction in the instrument's output. An optimum detector position is specified for the rotating target condition considered. The experimental results are compared with theoretical results in order for the predictive of further noise reduction to be made. For reliable operation and increased reduction it is essential to minimize the speckle noise contribution to the Laser Vibrometer output.

Paper Details

Date Published: 23 August 1996
PDF: 10 pages
Proc. SPIE 2868, Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (23 August 1996); doi: 10.1117/12.248633
Show Author Affiliations
Matt Denman, Loughborough Univ. (United Kingdom)
Neil A. Halliwell, Loughborough Univ. (United Kingdom)
Steve J. Rothberg, Loughborough Univ. (United Kingdom)


Published in SPIE Proceedings Vol. 2868:
Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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