Abstract

分体式大靶面测试系统的探测光幕灵敏度直接影响飞行弹丸速度测量的精度。可在散布不大的情况下,使用反射膜与激光器代替矩形大面积测试系统中的人工光源,简化测试系统。对新建的三角形探测光幕的灵敏度进行了分析,综合考虑激光器在不同传播距离处的光强度衰减、空间的非均匀性分布及反射膜逆反射系数和镜头离轴效应等因素,采用数值仿真和实弹试验的方法,将同一弹径的弹丸穿过光幕不同位置时的灵敏度等效到同一基准点进行归一化分析。结果显示,镜头离轴效应对灵敏度影响最大,激光器空间非均匀性分布影响最小。在3.5 m×2 m(宽×高)的直角三角形探测光幕区域进行实弹试验,其结果与仿真结果一致,距镜头越近,灵敏度越高;反之越低。研究结果可为类似原向反射式大面积探测光幕的工程设计提供参考。

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