天幕靶探测灵敏度是天幕靶的一项重要指标,该参数值的大小与系统结构密切相关.通过对天幕靶光机系统的研究,分析了天幕靶探测距离在300倍弹径对应的系统结构参数,给出了相应的狭缝尺寸.并在此基础上计算了测试弹丸穿过天幕靶时的相对光通量变化,计算结果表明测试弹丸长度与测试高度对天幕靶探测灵敏度有直接的影响.当探测高度为300倍弹径时,弹丸穿过天幕靶光幕时的灵敏度数值为0.48％.%The sensitivity of sky screens is one of the important parameters and the structure of sky screens can be expressed by the value of sensitivity. This paper presents the research results of the sky screen target system. Parameters of sky screen system with sensitivity of 300 equivalent bullet diameter (EBD) are analyzed. The size of the sky screen slit is given. Test results show that the length of bullets will influence the sensitivity of sky screens and EBD is the function of bullet's length. The sensitivity of sky screens, which changes with light flux, is 0. 48% at a trajectory height of 300 EBD.
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