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Optical Engineering

Influence of the configuration of the optical setup on the characteristics of Doppler signals in a dual-beam laser velocimeter: evolution of signal visibility
Author(s): Jorge L. Lagranja; J. Ignacio Garcia-Palacin; Luis A. Aisa
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Paper Abstract

A method is presented to compute signal characteristics in a dual-beam laser Doppler velocimeter of any configuration and, as a first application, the influence of the optical configuration on signal visibility is also investigated. A simplified model of signal generation is also introduced by which the behavior of signal properties can be physically explained. This model shows that signal visibility is due to a coupling effect between the spatial period of the scattered interference pattern and the angle subtended by the detection aperture. Closed analytical expressions are derived for this period for the scattering components of reflection and refraction without internal reflections. A similar study concerning the evolution of signal phase shift is now in progress.

Paper Details

Date Published: 1 July 1994
PDF: 12 pages
Opt. Eng. 33(7) doi: 10.1117/12.172897
Published in: Optical Engineering Volume 33, Issue 7
Show Author Affiliations
Jorge L. Lagranja, Univ. of Zaragoza (Spain)
J. Ignacio Garcia-Palacin, Univ. de Zaragoza (Spain)
Luis A. Aisa, Univ. de Zaragoza (Spain)

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