8 May 2001 Underwater lidar imaging (UWLI) system in short turbid water tank
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Proceedings Volume 4416, Optical Engineering for Sensing and Nanotechnology (ICOSN 2001); (2001) https://doi.org/10.1117/12.427066
Event: Optical Engineering for Sensing and Nanotechnology (ICOSN '01), 2001, Yokohama, Japan
Abstract
We are first to demonstrate the underwater lidar imaging (UWLI) in such a 3 m short water tank with highly turbid water successfully, and show the range-gated phenomenon in water much more clearly based on our newly designed serial targets. The target set comprises a series of three bar test targets (five in total), which are set at intervals of 22.5 cm roughly along the laser illumination direction since the light speed in water is 22.5 cm/ns. We synchronize precisely (approximately 0.5 ns) 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 do not want their images. The attenuation coefficients in water are 1.0/m and 2.3/m (extremely turbid). Compared with non-gated case, the most distinct difference between the gated images and non-gated 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 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.
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Duo-Min He, Gerald G. L. Seet, "Underwater lidar imaging (UWLI) system in short turbid water tank", Proc. SPIE 4416, Optical Engineering for Sensing and Nanotechnology (ICOSN 2001), (8 May 2001); doi: 10.1117/12.427066; https://doi.org/10.1117/12.427066
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