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Proceedings Paper

Laser range-finding: global characterization of the optical head and implementation of measurement methods
Author(s): Gaelle Bazin; Bernard A. Journet
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Paper Abstract

Whatever laser range-finding technique is used, the operation principle is based on optical information coding and transmission. Indeed, the optical head represents the common point within the whole of telemetric methods. So, its precise characterization presents a major interest. The emission part is performed by a laser diode and the reception by an avalanche photodiode coupled with filtering and RF amplification. The optical path is along coaxial alignment if an appropriate geometry is chosen. The whole systems may be considered as a quadriple with the emitter as the input and the receptor as the output. Therefore, the network analyzer is particularly adapted to a global study of such a quadripole. With a measurement protocol, the performances of the optical head can be then evaluated in terms of optical and electronic properties. Nevertheless, according to the great variety of angles to be measured, many range-finding methods can be used, as the frequency modulated continuous wave (FMCW) radar ranging method, the phase-shift measurements, either with heterodyne method or direct synchronous detection. Whereas two of these, the FMCW or the heterodyne phase detection, have already been developed in our laboratory, we only introduce as a new method the synchronous detection.

Paper Details

Date Published: 20 January 1997
PDF: 8 pages
Proc. SPIE 2909, Three-Dimensional Imaging and Laser-Based Systems for Metrology and Inspection II, (20 January 1997); doi: 10.1117/12.263317
Show Author Affiliations
Gaelle Bazin, Lab. d'Electricite Signaux et Robotique/Ecole Normale Superieure de Cachan (France)
Bernard A. Journet, Lab. d'Electricite Signaux et Robotique/Ecole Normale Superieure de Cachan (France)


Published in SPIE Proceedings Vol. 2909:
Three-Dimensional Imaging and Laser-Based Systems for Metrology and Inspection II
Kevin G. Harding; Donald J. Svetkoff, Editor(s)

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