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Proceedings Paper

Underwater lidar imaging in highly turbid waters
Author(s): Duo-Min He; Gerald G. L. Seet
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Paper Abstract

Based on a newly-designed serial target, we firstly demonstrate the underwater LIDAR imaging in such a 3m short water tank with highly turbid waters successfully, and show the range-gated phenomenon in water much more clearly. The target-set comprises a series of three bar test targets, which are set at intervals of 22.5cm roughly along the laser illumination direction since the light speed in water is 22.5 cm/ns. We synchronize precisely the UWLI system to range-gate on the targets which we want to capture their images, and to range-gate out the targets which we don't want their images. The attenuation coefficients in waters are 1.0/m and 2.3/m. Compared with non-gated case, the most distinct difference between the gates images and non-gated im ages in turbid water is that the nearer the target is located, the clearer its image is on the non-gated photos, but for the gated case the situation will be inverted completely when the delay time is adjusted suitably; that is, the image of the farther target could be much clearer than the image of the nearer target even in very turbid water.

Paper Details

Date Published: 14 January 2002
PDF: 11 pages
Proc. SPIE 4488, Ocean Optics: Remote Sensing and Underwater Imaging, (14 January 2002); doi: 10.1117/12.452805
Show Author Affiliations
Duo-Min He, Nanyang Technological Univ. (Singapore)
Gerald G. L. Seet, Nanyang Technological Univ. (Singapore)

Published in SPIE Proceedings Vol. 4488:
Ocean Optics: Remote Sensing and Underwater Imaging
Robert J. Frouin; Robert J. Frouin; Gary D. Gilbert, Editor(s)

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