单镜头天幕靶配接线阵光源探测灵敏度分析

Detection sensitivity analysis of single-lens sky-screen with linear array light source

单镜头天幕靶配接线阵光源构成等腰三角形探测光幕,常用作室内靶道速度测量装置,探测灵敏度直接影响天幕靶测速精度。分析了该类探测光幕的构建及工作原理,考虑天幕靶光学镜头的边缘效应及照度距离衰减,建立了灵敏度计算模型,推导了弹丸穿过光幕时刻遮挡光源引起光通量变化量的计算公式,以弹丸穿过光轴上某处产生的光通量变化量为参考值进行归一化处理,得到探测光幕内灵敏度分布规律并进行实弹射击试验验证,文中的结论可用于指导天幕靶配接线阵光源测速系统的使用和设计。

Single-lens sky-screen is commonly used as indoor ballistic range velocity measurement device with linear array light source constitutes an isosceles triangle detection screen.The detection sensitivity directly affects the velocity measuring accuracy of sky-screen.The construction and measurement principle of detection screen are introduced,the sensitivity calculation model is set up,the calculation formula of luminous flux variation caused by the projectile shielding light source when projectile passing through detection screen is induced based on the edge effect of the optical lens and the principle of illumination attenuation with distance;The sensitivity distribution within the detection screen is obtained and verified by experimentation,normalized luminous flux variation produced by projectile passing through the optical axis as reference value.The conclusions provide guidance for the use and design of the velocity measurement system of the sky-screen with light source.