Design of circular polarization imaging system for underwater laser gating

At present, the strategic adjustment of global military has a common trend. With the deepening of the exploration of China's Marine, river and groundwater resources, the military demand of territorial sea sovereignty defense is becoming increasingly urgent. The realization of underwater environment survey, target detection and positioning analysis technology has become an urgent problem to be solved in underwater equipment operation in many fields. The current underwater detection technology is mainly divided into acoustic detection and optical detection. Sound detection has small underwater attenuation, wide detection range and relatively mature technology, but its imaging target identification is difficult, real-time, and is easily subject to Marine noise interference. It is difficult to fully adapt to the needs of many underwater delivery platforms and deep-sea detection operations for high resolution imaging detection, observation and positioning. The underwater photoelectric imaging technology, it has become the necessary equipment for many underwater submersible, underwater operation system and target exploration systems. The underwater laser selected circular polarization imaging system consists of selected circular polarization imaging subsystem, underwater laser radiation source, synchronous timing control subsystem, power supply, integrated display control subsystem and sealing structure. The system mainly adopts the distance selection + polarization laser imaging method, reduces the influence of backscattering on imaging quality through the underwater circular polarization laser imaging system based on distance selection, and establishes the database of the characteristics of underwater circular polarization laser imaging; on this basis, an engineering prototype is built to provide application support for target detection, identification and industrialization.