Recoil energy measuring system of a underwater launcher is formed by means of horizontal recoil device, electromagnetic velocity sensor, measuring amplifier, transient waveform recorder and computer.
The wide-angle sky screen can be used for measuring the terminal velocity of the projectile, and providing synchronous signal for other trajectory measurement apparatus as the trigger device of the .
该装置可以用来测试弹丸末速，作为较大靶面的触发装置，为其他弹道测试仪器提供同步信号。
3
Some problems in the traditional experiment of measuring sound velocity by using the resonant pipe device are analyzed.