Underwater transceiving separated water body detection laser radar

Abstract

The invention provides an underwater transceiving separated water body detection laser radar which comprises a transmitting telescope and a receiving telescope which are arranged in a closed double-shaft rotary scanning device and placed below the water surface, other components of the separated water body detection laser radar are arranged above the water surface, and the overwater components and the underwater components are connected on an optical path through optical fiber cables. Laser emission and echo receiving are both carried out in the water body, so that echo information does not need to be subjected to atmospheric correction, the influence of waves and the interference of an air-sea interface do not need to be considered, the background noise of the sun and the sky is small, the signal processing difficulty can be reduced, and the precision of echo signal extraction and water body parameter inversion can be improved. Besides, the transceiving telescope arrays are placed at different water depths, evolution conditions of properties and sizes of particles in the ocean in the descending process can be detected, quantitative description of the ocean carbon sink process is achieved, and meanwhile layered information detection of biological populations in the ocean can also be achieved.

Description

technical field [0001] The invention relates to the technical field of laser radar, in particular to a separated underwater detection laser radar for transmitting and receiving underwater. Background technique [0002] Lidar can penetrate water bodies to obtain accurate information on the upper surface of water bodies. The existing water body detection lidar is based on ship-borne, airborne or space-borne platforms, which can detect a wide range of ocean water body information. [0003] However, since the laser emitting and echo receiving telescopes are located above the water surface at this time, the laser needs to pass through the atmosphere and the air-sea interface and finally enter the water body after being emitted from the telescope, and the echo signal also needs to pass through the air-sea interface and the atmosphere to be finally received by the telescope. . Therefore, when extracting echo signals and inverting water body parameters, 1) atmospheric correction n...

AI Technical Summary

Problems solved by technology

Therefore, when extracting echo signals and inverting water body parameters, 1) atmospheric correction needs to be performed on the echo signals, and 2) the influence of waves and the interference of the air-sea interface need to be considered, which not only increases the difficulty of signal processing, but also affects the Accuracy of signal extraction and water parameter inversion

3) There is an azimuth blind area, which cannot realize omni-directional scanning in water bodies, nor can it realize layered scanning of water bodies, and the laser detection depth is also limited

[0004] In order to overcome the above difficulties, for shipborne water body lidar, the ideal laser is located directly below the water surface, so as to realize the extraction of optical parameters of the water body that can scan in all directions, but there is a technical bottleneck. 1) If the entire system is placed in the water body 2) After the system is put into the water body, the modules in the system cannot be adjusted; 3) The system contains active devices, and it is difficult to supply power to the system; 4) The system is large in size and heavy in weight. Difficulty scanning in bodies of water

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