单列光源反射式光幕靶检测弹着点

为了降低弹丸着靶点检测的成本,提出了一种新的弹着点检测原理。采用单列光源,经两面条形表面反射镜反射后,形成"Z"型的三道光幕,用于实现对弹丸等飞行目标的测速及定位。弹丸的速度和着靶点水平方向的坐标可以通过对时间的测量得到,弹丸着靶点竖直方向的坐标可以通过单列光探测器获知。文中对检测原理进行了研究,对光源、探测器、信号特征、有效测试区域、射频测试能力等进行了分析,并在桌面进行了原理性试验。高速摄影机拍摄的小球坐标与"Z"型结构测量出的坐标相对位置误差为0.1～1mm,传统区截靶法与"Z"型结构测量出的小球速度相对测速误差为0.02%～0.2%,说明基于反射镜的"Z"型结构在定位和测速方面的应用具有可行性,提出的方法具有结构简单、解算方便、节省成本的特点。

Measurement of impact points using reflective light screen target of single column light source

To reduce the costs of an impact point measurement, a measuring method for impact points of projectiles was proposed. A Z-shaped light screen target containing three light screens was made up of a column laser source, a optical detector and two pieces of mirrors to measure the impact points and the velocities of projectiles. The velocity and the impact point position in the horizontal direction were obtained by a time measurement and the impact point position in vertical direction was obtained by an optical detector. The principle was analyzed and the light source, optical detector, the feature of impact signal, available detector area, and the firing rate were discussed. A principle experiment with a steel ball was carried out on a smooth plane table using a laser pen, two pieces of mirrors and a photodiode circuit. The experiments show that the absolute errors of position measurement by the proposed method are 0.1 to 1 mm as compared with that by a high speed camera.Furthermore,the relative errors of velocity measurement are between 0.02% to 0.2% as compared with that of a traditional method. The experimental results indicate that the method is feasible and easy to realize in a low cost.