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Optical Engineering

Calibration and operation of an underwater laser triangulation sensor: the varying baseline problem
Author(s): M. J. Chantler; James Clark; Manickam Umasuthan
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Paper Abstract

We describe the calibration and operation of a high-speed underwater scanning depth finder that has been designed for workspace sensing (that is, for ranges of 2 m or less). It uses standard components mounted in an underwater housing fitted with a planar viewing port. The use of a laser line forming element coupled with a single galvanometer mirror system enables fast data capture but introduces alignment problems with standard domed ports. Hence a planar interface is used. This results in the triangulation baseline varying as a function of scan angle. We present a simple but novel solution for the calibration and use of such a device. The effect of the varying baseline is modeled, and a calibration/depth calculation process is presented. Results obtained from using the device in a test tank demonstrate the performance of the system.

Paper Details

Date Published: 1 September 1997
PDF: 8 pages
Opt. Eng. 36(9) doi: 10.1117/1.601500
Published in: Optical Engineering Volume 36, Issue 9
Show Author Affiliations
M. J. Chantler, Heriot-Watt Univ. (United Kingdom)
James Clark, Heriot-Watt Univ. (United Kingdom)
Manickam Umasuthan, Heriot-Watt Univ. (United Kingdom)

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