Calibration and operation of an underwater laser triangulation sensor: the varying baseline problem

M. J. Chantler; James Clark; Manickam Umasuthan

doi:10.1117/1.601500

1 September 1997 Calibration and operation of an underwater laser triangulation sensor: the varying baseline problem

M. J. Chantler, James Clark, Manickam Umasuthan

Optical Engineering, Vol. 36, Issue 9, (September 1997). https://doi.org/10.1117/1.601500

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.

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M. J. Chantler, James Clark, and Manickam Umasuthan "Calibration and operation of an underwater laser triangulation sensor: the varying baseline problem," Optical Engineering 36(9), (1 September 1997). https://doi.org/10.1117/1.601500

Published: 1 September 1997

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