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Proceedings Paper

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

Although developments of underwater robotics vehicles (URV) have been rapid in recent years, the underwater vision sensing is still regarded as a major tough undertaking, particularly in turbid water condition. Currently, a Underwater Lidar Imaging (UWLI) sensing system has been finished and demonstrated nano-second level gated images in highly turbid water. It permits to keep underwater vision sensor with optical resolution but reduce the optical scattering noise in water dramatically. Based on our newly- designed series targets at intervals of 22.5cm, we are first to study UWLI in such a 3m short tank successfully. The system could be synchronized precisely to range-gate the targets which we want to have its image, and to gate out the targets which we don't want its image. The attenuation coefficients of highly turbid waters are 1.0/m and 2.3/m. Compared with non-gated photos, the most distinct difference between the gated imaged and non-gate images 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 time-delay is set suitably, i.e. the image of the farther target could be much clearer than the image of the nearer target in very turbid water.

Paper Details

Date Published: 30 October 2001
PDF: 12 pages
Proc. SPIE 4596, Advanced Photonic Sensors and Applications II, (30 October 2001); doi: 10.1117/12.447336
Show Author Affiliations
Duo-Min He, Nanyang Technological Univ. (Singapore)
Gerald G. L. Seet, Nanyang Technological Univ. (Singapore)

Published in SPIE Proceedings Vol. 4596:
Advanced Photonic Sensors and Applications II
Anand Krishna Asundi; Wolfgang Osten; Vijay K. Varadan, Editor(s)

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