Utilization of the optical chronograph for deep investigation of natural water reservoirs

摘要

Laser remote sensing of water, and the use of laser-induced fluorescence (LIF) in particular, are widely applied for Ocean investigations. Integration of the image-forming channel in such systems considerably extends the scope of these investigations, which is of great importance from various points of view. An experimental setup is created, with the help of which series of experiments have been carried out on the Lake Sevan. Test objects' images of different sizes and different reflection coefficients, located at various depths, for various receiver-transmitter fields of view were obtained. Corresponding dependences of reflected signal value and image contrast on water depths were also obtained. The investigations showed a 1.5-2 times increase of the object visibility limit depth as compared with the white disk visibility. Water transparency data obtained by these results coincide with those obtained with the use of the white disk. The measurements were further carried out under laboratory conditions in a 33 m pipe, filled with water, initial characteristics of which were changed. Dependences of the reflected signal value, both from the depth and water transparency were obtained for various objects.