斜入射弹丸速度测量系统研究

天幕靶是用于测量弹丸速度较为普遍的光学测量仪器。在测量弹丸速度时,要求弹道垂直于天幕靶的靶面,当弹道不垂直预定靶面时,弹丸飞越两个天幕靶靶面的实际距离与两靶靶距存在一定的误差,斜入射角度越大误差越大。提出了一种用6个天幕构成天幕阵的速度测量系统。当弹丸以任意方向穿越6个天幕时,测时仪记录弹丸穿越各个天幕的时间间隔,根据这些时间间隔便可以求出弹丸的速度值和速度的飞行方向。该方案解决了弹丸斜入射时速度测量不准的问题,特别适用于枪弹末速度的测量。

Study of bullet velocity measurement system at any direction incidence

The sky screen is the universal optical measurement instrument which is used to measure the bullet velocity. When the sky screen is used,it requires that the flying trajectory is vertical to the sensing screens.Otherwise there exists defi- nite error between practice distance of the bullet flying to the two screens and the distance of the two sky screens.The greater of the slanting incidence angle,the greater of the error.A velocity measuring system is presented which is based on six intersec- tant sky screens.When the bullet through the six screens at any direction,the time intervals of bullet through the six screens are measured by chronometer.The bullet velocity and the flying direction can be calculated according to the time intervals.The system can solve the problem of inaccurate measurement of velocity at any direction,and it is especially useful in the measure- ment of the bullet velocity in terminal trajectory.