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Proceedings Paper

Global noise characteristics of a laser Doppler vibrometer part I: theory
Author(s): R. F. Strean; Larry D. Mitchell; A. J. Barker
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Paper 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.

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: 10.1117/12.248624
Show Author Affiliations
R. F. Strean, Lexmark International, Inc. (United States)
Larry D. Mitchell, Virginia Polytechnic Institute and State Univ. (United States)
A. J. Barker, Virginia Polytechnic Institute and State Univ. (United States)


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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