A System for Measuring Two-Stage Light Gas Gun Projectile Velocity with Laser Screen and Photodetector

A new velocity measurement system is set up for measuring the millimetresized projectile velocity in two-stage light gas gun. The system consists of an installation platform and a laser velocimeter which using red light semiconductor laser as lamp-house and silicon photodiode as photodetector. The platform installed in the barrel test section has numerous advantages of simple structure, aseismic design, easy adjustment and measurement. Using this new measurement system, the metallic and non-metallic projectiles velocities are successfully achieved. Moreover, the velocities of metallic projectile measured by this system are compared with those using magnetic induction sensors. The results show that this system not only has high reliability and accuracy but also high sensitivity, strong anti-interference and wide range of applications.