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描述了一种基于大气散射特性分析的微光夜视系统设计。通过分析大气对光学辐射的散射作用,在理想光电成像系统探测方程的基础上,建立了散射介质成像的探测模型,表明大气散射会严重衰减目标对比度,而目标对比度的传递特性即系统调制传递函数将直接影响观察的作用距离。通过选择应用响应光谱主要集中于0.6μm~1.0μm的三代像增强器,优化设计光学系统的MTF,实现了大气环境下的微光系统作用距离的提高。完成的两种焦距分别为250mm和320mm,采用了三代像增强器的夜视仪.野外试验表明,实现对空目标作用距离最大13.7km~18.3km发现、8.0km~8.1km识别。
A design of low light night vision system based on the analysis of atmospheric scattering properties is described. By analyzing the scattering effect of atmospheric radiation on optical radiation, a detection model of the scattering medium imaging is established based on the detection equation of the ideal electro-optical imaging system, which shows that the atmospheric scattering will seriously attenuate the target contrast, and the transfer characteristic of the target contrast is the system modulation transfer function Will directly affect the observation of the role of distance. By choosing the three generations of image intensifier whose application response spectrum is mainly focused on 0.6μm ~ 1.0μm, the MTF of the optical system is optimized, and the effect distance of the glimmering system in the atmosphere is improved. The two focal lengths are 250mm and 320mm, respectively, and three generations of night-vision image intensifier are used.Field experiments show that the maximum range of 13.7km ~ 18.3km and the range of 8.0km ~ 8.1km can be achieved when the target is empty.