针对空气炮弹丸速度测试的需要设计了一种对射式激光测速系统。利用半导体激光器和光电二极管组成光学系统对弹丸过靶信息进行识别,设计光电转换电路和滞回比较器对过靶信号放大整形,选用STC89C52单片机代替采集卡和计算机对信号进行处理。通过对直径30mm、长度150mm弹丸的速度进行测试,结果表明:该系统具有成本低、操作简便、响应速度快、误差小等优点,有很好的实用价值。

In view of projectile velocity measurement of air gun, a design of correlative laser velocity measurement system was presented. The optical system that consists of semiconductor lasers and photodiodes was used to identify the information of projectile penetrating the target, photoelectric conversion circuit and hysteretic comparator was designed to amplify and shape the signal, instead of computer and the data acquisition, the STC89C52 MCU was used to process the signal. The actual velocity test result for the projectile with 30 mm diameter and 150 mm length shows that the system has advantages of low cost, easy operation, fast response and small error and has a good practical application value.