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Proceedings Paper

Extension Of The Dynamic Range Of Active Laser Range Finders
Author(s): J.-Angelo Beraldin; Francois Blais
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Paper Abstract

Active range finders based on triangulation have proven to be very useful when dense depth maps are required. A number of range finders utilize linear or bidimensional arrays of photodetectors (photodiodes or MOS-type) to provide depth information. A practical limitation of these sensors is their relatively low saturation level. Once the saturation exposure has been reached, the accuracy drops. Many applications require a 3-D sensor with a dynamic range in excess of 100 000:1. Most sensor arrays with position evaluation circuitry have a combined dynamic range of 100:1-1 000:1. Consequently, these 3-D sensors will have limited usefulness in these applications. Some practical considerations in this field are presented and the results are given which were obtained from a system, designed in-house, that controls the laser source in such a way that the saturation exposure on the sensor array is never exceeded. These preliminary results have demonstrated an increase of the dynamic range of the sensor by a minimum factor of 100. The maximum throughput rate is typically 100 000 depth measurements per second and can be as low as 300 per second.

Paper Details

Date Published: 7 March 1989
PDF: 5 pages
Proc. SPIE 1005, Optics, Illumination, and Image Sensing for Machine Vision III, (7 March 1989); doi: 10.1117/12.949041
Show Author Affiliations
J.-Angelo Beraldin, National Research Council Canada (Canada)
Francois Blais, National Research Council Canada (Canada)

Published in SPIE Proceedings Vol. 1005:
Optics, Illumination, and Image Sensing for Machine Vision III
Donald J. Svetkoff, Editor(s)

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