Speckle noise reduction in laser vibrometry: experimental and numerical optimisation

Matt Denman; Neil A. Halliwell; Steve J. Rothberg

doi:10.1117/12.248633

23 August 1996 Speckle noise reduction in laser vibrometry: experimental and numerical optimisation

Matt Denman, Neil A. Halliwell, Steve J. Rothberg

Proceedings Volume 2868, Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (1996) https://doi.org/10.1117/12.248633
Event: Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 1996, Ancona, Italy

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.

Citation Download Citation

Matt Denman, Neil A. Halliwell, and Steve J. Rothberg "Speckle noise reduction in laser vibrometry: experimental and numerical optimisation", Proc. SPIE 2868, Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (23 August 1996); https://doi.org/10.1117/12.248633

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