人体目标光谱特性对微光像增强器视距的影响

Influence of Human Body Target's Spectral Characteristics on Visual Range of Low Light Level Image Intensifiers

为研究不同人体目标的反射光谱特性对微光像增强器视距的影响,以夜天空辐射光谱特性和常见衣服的光谱反射系数为基础,建立了人体目标的反射光谱分布方程,分析了人体目标穿着不同材质和颜色衣服时的反射光谱特性,并从微光像增强器视距实际探测方程出发,讨论了微光像增强器对不同人体目标的探测能力。发现不同人体目标的反射光谱特性对微光像增强器视距的影响主要体现在平均反射率珋ρ和目标背景初始对比度C0方面,棉质衣服的反射系数和光谱反射强度比涤纶衣服高,微光像增强器对穿着棉质衣服的人体目标的探测能力更强。微光像增强器对穿着同样颜色棉质衣服的人体目标的视距比穿着涤纶衣服远,对穿着浅色衣服的人体目标的视距比穿着深色衣服远,在满月情况下像增强器对衣服的材质更敏感。

To study the effect of different human target＇s spectral reflective characteristic on low light level（LLL） image intensi fier＇s distance, based on the spectral characteristics of the night-sky radiation and the spectral reflective coefficients of common clothes, we established a equation of human body target＇s spectral reflective distribution, and analyzed the spectral reflective characteristics of different human targets wearing the clothes of different color and different material, and from the actual detec- tion equation of LLL image intensifier distance, discussed the detection capability of LLL image intensifier for different human target. The study shows that the effect of different human target＇s spectral reflective characteristic on LLL image intensifier dis tance is mainly reflected in the average reflectivity p and the initial contrast of the target and the background Co. Reflective coeffi cient and spectral reflection intensity of cotton clothes are higher than polyester clothes, and detection capability of LLL image intensifier is stronger for the human target wearing cotton clothes. Experimental results show that the LLL image intensifiers have longer visual ranges for targets who wear cotton clothes than targets who wear same color but polyester clothes, and have longer visual ranges for targets who wear light-colored clothes than targets who wear dark-colored clothes. And in the full moon illumination conditions, LLL image intensifiers are more sensitive to the clothes＇ material.