天幕靶光学探测性能分析与灵敏度建模型方法

Optical Performance Analysis and Sensitivity Modeling Method for Sky Screens

根据天幕靶的工作原理和目标探测方式,从天幕靶的光学透镜成像光斑特点、目标自身的参数等,建立了多关联因素的天幕靶探测灵敏度模型。研究与分析弹丸长度与光幕厚度和探测距离因素下的探测灵敏度分段函数,推导了目标光通量与背景光通量的函数,结合所建立的灵敏度模型仿真分析了探测视场内不同过靶位置与灵敏度的关系以及离焦量、背景照度与灵敏度的关系。并通过实验采集了弹丸穿过天幕靶不同位置条件下的输出信号,分析了探测系统的信噪比分布,验证了本研究所建立的灵敏度模型的合理性。

This paper establishes a sensitivity model of sky-screen detection influenced by many factors.The model is based on the principle and detection method of sky-screen,combining the characteristics of the optical lens imaging spot and the parameters of the target itself.Functions of target luminous flux and background luminous flux are obtained by analyzing the piecewise function of detection sensitivity under the influence of projectile length,light curtain thickness and detection distance.Through the simulation of the established model and the analysis of the results,the variation relationship between the sensitivity and different target position,defocus amount,background illumination is obtained.The output signals of projectile passing through different positions of sky-screen are collected by experiments.The rationality of the sensitivity model established in this paper is verified by analyzing the signal-to-noise ratio distribution of detection system.