An underwater laser imaging system is introduced in this paper. The system has demonstrated underwater imaging capabilities in excess of 3 times the range of visible camera with lights, having three-dimensional (3D) imaging and range gated imaging ability. It also has small size and no gravity in water, can be manually handheld and carried on underwater unmanned platform.
According to the requirement of the full-spectrum camera for detection and warning proposed a camera structure which can cover the ultraviolet (UV, 250-400nm), visible light (480nm-680nm), medium wave infrared (MWIR, 3700nm-4800nm), long-wave infrared (LWIR, 8000nm-12000nm). The camera can utilize the different radiation characteristics of weapons target to achieve the full-spectrum detection and warning. In this structure, a four off-axis reflection system was used as the Primary Optical Systems. Four splitters were utilized to achieve four spectral bands. According to the detector and the corresponding application, the calculation and the design of the four subsystems were completed. After the design, the MTF of the four optical system show as follows: UV MTF>0.7@39lp/mm, visible MTF>0.7@72lp/mm, MWIR MTF> 0.7@17lp/mm, LWIR MTF> 0.7@17lp/mm.
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