摘要
准确触发照相机是获得弹丸从炮口开始的一定距离范围内飞行姿态和结构完整性图像的关键.通常,照相机的触发时间是根据预先估计的弹丸炮口速度计算出来并预置于照相机的延时电路中的.然而,弹丸的实际速度在一定范围内的变化使得预置时间不够准确,而丢失了所要求的照片.现在,一种能够自动测量弹丸炮口速度的实时触发系统已研制成功,根据弹丸的炮口速度自动调整照相机的触发时间.这一系统已被弹道国防科技实验室采用,并成功地用于37mm的弹丸实弹试验.
Flash photography is an excellent method to record the projectile immediately after launch from the gun tube. A precise time delay is necessary to assure that the flash photography unit is triggered at the proper time. Normally, the time delay is computed based on the expected velocity and preset into the flash photography delay circuit. However, the variation of the actual velocity can result in the preset delay being inaccurate. This is especially true in research and development programs. A realtime delay trigger system has been developed which will automatically provide a trigger at the correct time regardless of the projectile velocity. It has been used in the National Defence Ballistic Research Laboratory and successfully tested for the 37 mm projectile.
出处
《弹道学报》
EI
CSCD
1996年第1期88-93,共6页
Journal of Ballistics
