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Proceedings Paper

Optimization and performance assessment of a self-aligned heterodyne laser radar system for surface displacement monitoring
Author(s): Alejandro Rodríguez; David Garcia; Adolfo Comeron; Federico Dios
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Paper Abstract

The optimization and performance assessment of a reference-beam, continuous-wave, heterodyne low-power laser radar prototype is presented, based on previous homodyne prototypes. It measures both magnitude and sign of the radial component of the displacement velocity. The basic set-up includes a low power (~3 mW) commercial HeNe laser, a beam-splitter, an acousto-optic modulator, and a two-lens system that both focuses the transmitted beam on the target surface and collects the scattered light. Both the reference beam and the radiation collected are focussed onto a Si avalanche photo-detector. The self-aligned configuration of the receiver makes possible, theoretically, to perform optimal mixing between the received scattered radiation and the reference beam. The resulting electrical signal is fed to a transimpedance amplifier and displayed on a spectrum analyser. Laboratory experiments employing as a target the rim of a 50 cm-diameter rotating wheel placed at several distances have been performed. Results concerning detected signal-to-noise ratio, detected-signal spectral width, accuracy of the radial component of the velocity under measurement and system working range will be presented and discussed.

Paper Details

Date Published: 12 January 2004
PDF: 10 pages
Proc. SPIE 5240, Laser Radar Technology for Remote Sensing, (12 January 2004); doi: 10.1117/12.510694
Show Author Affiliations
Alejandro Rodríguez, Univ. Politecnica de Catalunya (Spain)
David Garcia, Univ. Politecnica de Catalunya (Spain)
Adolfo Comeron, Univ. Politecnica de Catalunya (Spain)
Federico Dios, Univ. Politecnica de Catalunya (Spain)

Published in SPIE Proceedings Vol. 5240:
Laser Radar Technology for Remote Sensing
Christian Werner, Editor(s)

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