镜头式光幕探测灵敏度分布规律研究

Research on Detection Sensitivity Distribution Regularity of Lens-light-screen

针对室内大靶面探测光幕的试验与测试需求,研究了扇形光幕和矩形光幕的工程实现。分析了探测光幕的工作机理,依据光学系统的光照度分析理论,推导出弹丸在探测光幕面内不同位置穿过时引起的光通量变化量计算公式,利用Matlab计算出整个幕面的灵敏度分布规律。采用气枪弹在幕面内不同位置进行了射击试验验证。试验结果表明:弹丸在幕面内的信号幅值与仿真计算的灵敏度分布规律吻合。所得结论对大靶面探测光幕的工程设计具有参考价值。

In order to meet the testing requirement of indoor optical target with large detection area,two patterns of lens-light-screen＇s engineering realization method are studied,of which one is sector lenslight-screen,and the other is rectangle lens-light-screen. The working principle of each kind of lenslight-screen is analyzed. The luminous flux may be changed when a flying projectile goes through the lens-light-screen in different position,of which the corresponding formulas are deduced based on the photometry principle. The sensitivity distribution regularity of each kind of lens-light-screen is simulated using Matlab. It is verified by the firing tests of air gun bullets. The results show that the signal amplitude of the projectile collected by an oscilloscope is in conformity with the sensitivity simulation results,which provides a reference for the engineering design of the optical targets with lager detection area.