Harsdorf, Stefan
(2000)
Streulichtaufnahmen und Fluoreszenzmessungen mit einem Unterwasserlidar.
PhD, Universität Oldenburg.
Abstract
The underwater lidar is presented as a new optical instrument for seafloor monitoring. It is a combination of a range gated video system and a fluorescence lidar. Lidar equation and image formation are discussed, with a focus on multiple scattering effects. Inversion algorithms of fluorescence lidar signals provide optical characteristics of water column, sunken pollutant and sea bottom, e.g. emission spectrum and fluorescence lifetime. The optical transfer functions of water columns are determined, and a restoration algorithm is applied for deconvolution of range gated video images. The performance of the sensor depends on optical properties of the water column, the seafloor, the pollutants and the targets. These characteristics cover a wide range - from clear ocean to turbid river water, from dark mud to white sand, from strong fluorescent to non-fluorescent substances, from black to white objects - so that a general statement cannot be made. Nevertheless, the equations given by this work allow to predict signals and images for every defined scenario.
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