Global noise characteristics of a laser Doppler vibrometer part I: theory

R. F. Strean; Larry D. Mitchell; A. J. Barker

doi:10.1117/12.248624

23 August 1996 Global noise characteristics of a laser Doppler vibrometer part I: theory

R. F. Strean, Larry D. Mitchell, A. J. Barker

Proceedings Volume 2868, Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (1996) https://doi.org/10.1117/12.248624
Event: Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 1996, Ancona, Italy

Abstract

The use of a laser Doppler vibrometer to obtain velocity information from vibrating structures has gained wide acceptance in recent years. Although use of such an instrument can yield a spatially dense matrix of velocity information, several users have noted `noise' at certain points in the spatial field. The technique by which the SLDV system operates results in occasional velocity `drop-outs' which are unidirectional, always estimating the velocity response closer to zero than reality. These `drop-out' areas occur more predominately at points of maximum velocity response with small rotational components. Alternatively, points exhibiting minimum velocity response with large rotational components are less susceptible to the `noise'. In this paper, an experiment to visualize the speckle pattern motions received by the photodetectors during these vibration conditions is presented. Theories regarding the source(s) of the `noise' are developed.

Citation Download Citation

R. F. Strean, Larry D. Mitchell, and A. J. Barker "Global noise characteristics of a laser Doppler vibrometer part I: theory", Proc. SPIE 2868, Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (23 August 1996); https://doi.org/10.1117/12.248624

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