Abstract
For the further development and exploring the instantaneous laser velocimetry,the laser beat frequency velocity interferometry is analyzed and its applications and future development are discussed.Based on the key technology of it,the concept of time-divided laser velocity interferometry is proposed.It uses the time delay τ in the laser beat frequency velocity interferometry,in which the interferometer is keyed to measure,respectively,the displacement and velocity in the time range 0~τ and above τ,to determine the velocity of the first front edge in the shock process(i.e.,solve the uncertainty of fringe losing).In addition,it provides a higher upper bound of velocity measuring with lower hardware requirement(i.e.,with lower requirement for the bandwidth and sampling of the oscilloscope).Combining with the consideration of the property of shocking and explosion process,the parameters are selected properly,the fiber time-divided laser velocity interferometer is designed,its primary applications are investigated,and the application results show its effectiveness.
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