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Optical Engineering

One-wavelength two-component laser Doppler velocimeter system for surface displacement monitoring
Author(s): David García-Vizcaíno; Federico Dios; Jaume Recolons; Alejandro Rodriguez; Adolfo Comeron
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Paper Abstract

A two-component laser Doppler velocimeter (2D-LDV) prototype for surface-displacement measurement is presented. The system proposed is based on the Doppler differential technique with a backwardscattering configuration. A reference and two frequency-shifted probe beams are generated departing from a single laser beam by means of two beamsplitters and acousto-optic modulators. This configuration has the advantage of using a single-wavelength laser source and a single detector system, while permitting sign detection of the two vector components of the velocity in surface-displacement measurements. It also enables the implementation of a low-cost multitrigger data acquisition system, which is useful in low signal-to-noise ratio (SNR) situations, such as the velocity measurement of low-dispersion surfaces or in hydrodynamic applications. The prototype has been designed to measure velocities up to 3 m per second, both in industrial (solid target) and hydrodynamic applications, with an error well below 1% in the tests performed. The system works in real time with the use of an acquisition card and C++ based software on a PC.

Paper Details

Date Published: 1 December 2008
PDF: 11 pages
Opt. Eng. 47(12) 123606 doi: 10.1117/1.3050421
Published in: Optical Engineering Volume 47, Issue 12
Show Author Affiliations
David García-Vizcaíno, Univ. Politècnica de Catalunya (Spain)
Federico Dios, Univ. Politécnica de Cataluña (Spain)
Jaume Recolons, Univ. Politècnica de Catalunya (Spain)
Alejandro Rodriguez, Univ. Politécnica de Cataluña (Spain)
Adolfo Comeron, Univ. Politécnica de Cataluña (Spain)


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