In order to meet the test requirement of large sensor area light screen indoors, detection sensitivity of a lens-style light screen which is composed of arc light source and sky screen target was analyzed.The composition of this lens-style light screen test system was introduced, the working mechanism of its fan screen was analyzed, and the calculation formulation was put forward.According to the lens imaging principle and the fan screen forming principle, the influence of the light source placed distance R and the lens objective distance l on the detection sensitivity was researched theoretically, and the verified experiment was conducted.The results show that the mentioned lens-style light screen can work normally, its sensitivity is higher than the conventional sky screen target, the experiment results can provide reference for further engineering design.%针对室内大靶面光幕测试需求,对一种镜头式光幕探测灵敏度进行了分析,探测光幕由弧形光源配接天幕靶组成.介绍了镜头式光幕测试系统的构成,分析了扇面光幕的工作机理,给出了相应的灵敏度计算公式,根据镜头成像和扇面光幕形成原理,研究了光源放置距离R以及镜头物距l对镜头式光幕探测灵敏度的影响,并通过实验进行了验证.研究结果表明:文中所提的镜头式光幕能够正常工作,研究结果对进一步工程化设计提供了参考.
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