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Proceedings Paper

Novel underwater 3D-target design for measurement of depth of gating (DOG) in underwater lidar imaging (UWLI)
Author(s): Duo-Min He; Gerald G. L. Seet
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Paper Abstract

When doing underwater lidar imaging (UWLI) in highly turbid water, its ICCD camera must be set in fast-gating status. As less than 50 ns, most gated-ICCD will become non-linear, which is difficult to be tested. In order to evaluate fast- gating performance in UWLI, we suggest a new technical term Depth of Gating (DOG) for depicting fast-gating feature of UWLI system, and design a novel underwater 3D-target for taking on DOG measurement. Our underwater 3D-target consists of a series of three bar test targets (five in total) at intervals of 22.5 cm roughly along, but separated on a section across, the laser illumination direction. The gap between two round trip times to two neighbor targets is 2ns for 22.5 cm interval, 4ns for (22.5 cm X 2) interval, etc. since the light speed in water is 22.5 cm/ns. From our experimental study, it is shown that using the underwater 3D-target designed in such a way is a practical and efficient method to measure short DOG value in UWLI system. We may simply name it 'underwater DOG-target.'

Paper Details

Date Published: 4 September 2002
PDF: 12 pages
Proc. SPIE 4768, Novel Optical Systems Design and Optimization V, (4 September 2002); doi: 10.1117/12.482185
Show Author Affiliations
Duo-Min He, Nanyang Technological Univ. (Singapore)
Gerald G. L. Seet, Nanyang Technological Univ. (Singapore)

Published in SPIE Proceedings Vol. 4768:
Novel Optical Systems Design and Optimization V
Jose M. Sasian; R. John Koshel, Editor(s)

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