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Proceedings Paper

Visual sensing and range measurement by scanning of carbon dioxide laser
Author(s): Koichi Kawata; Hidemi Takahashi; Osamu Yamada; Minoru Kimura; Hiroshi Naito
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Paper Abstract

A laser vision sensor has been developed to enable range measurement and identification of targets through flames, smoke, and fog which are invisible to the human eye. This vision sensor employs a 10.6 micrometers -wavelength carbon dioxide laser for its long wavelength. The target is scanned two-dimensionally by the laser beam, directed by a pair of galvanometer mirrors, to produce the target image and measure the range of the target. The laser beam, amplitude-modulated to 5 MHz with an electro-optic modulator, is projected onto a target, and the reflected beam is detected by a cadmium mercury telluride detector. The phase difference between the projected and reflected light signals is used to provide range data up to 30 m. The indoor test is carried out with a 1 cubic meter box in which flames, smoke, and fog can be generated. The laser beam is projected through this box, and the targets behind this box are detected. The reproduced image is sufficient for identification through flames, smoke, and fog.

Paper Details

Date Published: 25 November 1992
PDF: 7 pages
Proc. SPIE 1697, Acquisition, Tracking, and Pointing VI, (25 November 1992); doi: 10.1117/12.138169
Show Author Affiliations
Koichi Kawata, Matsushita Research Institute Tokyo, Inc. (Japan)
Hidemi Takahashi, Matsushita Research Institute Tokyo, Inc. (Japan)
Osamu Yamada, Matsushita Research Institute Tokyo, Inc. (Japan)
Minoru Kimura, Matsushita Research Institute Tokyo, Inc. (Japan)
Hiroshi Naito, Matsushita Research Institute Tokyo, Inc. (Japan)

Published in SPIE Proceedings Vol. 1697:
Acquisition, Tracking, and Pointing VI
Michael K. Masten; Larry A. Stockum, Editor(s)

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