Laser interferometry has been generally accepted as a precision tool to obtain the velocity-versus-time profile of the moving surfaces of impact specimens. But most traditional laser interferometers require a source of long coherence length and high power to measure the low-velocity profile for impact specimens w1x, so it is not easy for these systems to measure it. Through theory analysis, which is first presented in the velocity interferometer system, a novel fiber-optic velocity interferometer for any reflector has been constructed successfully. Using it, the shocking velocity measures are accomplished for a Hopkinson bar under uniaxial stress loading. The results are in perfect agreement with the impedance match calculation. 全光纖多功能研發(fā)平臺