Abstract:
Based on the laser beam shut-ofr memod, a new kind of velocity in-situ measuring technique is presented, with which a non-contact Velocity measuring apparatus is built. The Velocity of a flyer is calculated by measuring the time interval in-situ while it flies through the laser screens for a certain distance. For the apparacus, a special miniatIlre laser is employed to produce an optical screen wim thichness of tens of micrometers;the photoelectric accepters wim a response time less than 1 ns are used to record the time signals when a nyer is launched and arrived. This non-contact Velocity measuring apparatus is very simple in components, with high sensitivity and is relatively inexpensive. The experimental data show that the measurement error is less man 5%for a flyer of 3 μm in thickness at a velocity approaching 10 km/s.