L形光源大面积矩形探测光幕灵敏度空域分布分析

The analysis of sensitivity spatial distribution of large area rectangular detection light screen with L-shaped light source

镜头式探测器配接L形LED光源构成大面积矩形探测光幕,常用来布置在封闭的室内靶道测量外弹道参数,其探测区域的灵敏度大小直接影响测量精度,文章研究和分析了配接L形LED光源的10m×10m大面积矩形探测光幕灵敏度空域分布规律,考虑镜头边缘效应和光传播路径损失,将飞行弹丸遮挡的光投射到镜头处计算光电器件接收的光通量变化,推导出探测光幕灵敏度的数学表达式,将探测区域分割成小块,采用数字仿真方式计算同一口径弹丸穿过不同区域块引起的光通量变化,得到矩形探测光幕区域灵敏度空域分布。结果显示矩形探测区域灵敏度呈现对称分布,靠近镜头主光轴和镜头附近处时,会得到探测区域内的较大探测灵敏度。其研究结果为后续进行大靶面外弹道测试相关技术提供了理论依据。

The lens light-screen detection sensor with L-shaped LED light source constitutes a large area rectangular detection light screen, which is usually arranged in a closed indoor test target to measure exterior ballistic parameters. The sensitivity of the detection area directly affects the measurement accuracy. The spatial distribution of sensitivity of 10 m×10 m large area rectangular detection light screen with L-shaped LED light source is been studied and analyzed, and the len edge effect and light propagation path is considered.The detection area is divided into small blocks, the change of luminous flux caused by the same caliber projectile passing through different blocks is calculated by digital simulation, and the spatial distribution of sensitivity of rectangular detection light screen area is obtained. The results show that the sensitivity distribution of the rectangular detection area is symmetrical. When it is closed to the main optical axis of the lens and near the lens, a larger detection sensitivity in the detection area will be obtained. The research results provide a theoretical basis for the subsequent large target exterior ballistic testing technology.