A new measuring method of the projectile velocity using flashshadowgraph system

摘要

A new measuring method of the projectile velocity using flashshadow graph system has been studied. The authors suggest a newmeasuring system using specially designed molecular nitrogen (N₂) laser flash shadowgraphy to capture the bullet position inrelation to the reference plane of sensors (screens) and employ flashsignal from ultra-high speed light detector directly as the triggersignal for chronograph. It follows that the trigger uncertainty producedby screen can be avoided. The design scheme using charge-coupled device(CCD) solid image camera to take shadowgraph without normal procedureincluding developing, fixing etc. is described. Experiments have provedthat the approach is feasible