一种改进的直视型微光夜视系统视距模型  

An Improved Apparent Distance Model for Direct-viewlow-light-level Night Vision System

作　　者：金伟其 张琴 王霞 李力 裘溯 JIN Wei-qi;ZHANG Qin;WANG Xia;LI Li;QIU Su(MOE Key Laboratory of Optoelectronic Imaging Technology and System,School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学光电学院光电成像技术与系统教育部重点实验室,北京100081

出　　处：《光子学报》2020年第4期56-65,共10页Acta Photonica Sinica

基　　金：微光夜视技术重点实验室基金(No.J20160101)。

摘　　要：针对经典视距模型对于三代与超二代像增强器的直视型微光夜视系统评价方面缺乏差异性,模拟仿真结果在10^-4 lx超低照度下不甚理想这一问题,对现有的经典视距模型进行了三个方面的优化:在系统的传递函数模型加入了人眼的传递函数;基于光阴极与景物的光谱匹配修正了景物在光阴极产生的平均光电子数和光电子对比度公式;在噪声来源中加入了背景噪声项.进而推导出改进的视距模型,并通过头盔系统的实际外场实验结果进行了验证.结果表明,改进的视距模型能有效分辨出超二代和三代夜视系统的识别距离的差异,计算结果更接近实际测量结果.There is no difference in the evaluation of the direct-view low-light-level night vision system for the three-generation and super-second generation image intensifiers.The simulation results are not ideal under the ultra-low illumination of 10^-4 lx.Therefore,three optimizations were made for the model:the transfer function of the human eye was added into the transfer function model of the system;the average photoelectron number and photoelectron contrast formula generated by the scene at the photocathode were corrected based on the spectral matching between the scene and the photocathode;the background noise term was added to the noise source.The improved apparent distance model was verified by the experimental results of the helmet system in field conditions.The results show that the improved model can effectively distinguish the difference between the recognition distances of the super-second generation and three-generation night vision systems,the calculation results are closer to the actual measurement results.

关 键 词：直视型微光夜视系统 经典视距模型 人眼传函 光谱匹配 暗背景噪声 

分 类 号：TN223[电子电信—物理电子学]