Line VISAR Technology Combined Surface And Its Application In The Detonation Driving

With the advantages of high time resolution, high accuracy and non-contact measuring, laser interferometer has become one of the standard techniques in the experimental research of shock and detonation physics. Especially Velocity Interferometer System For Any Reflector(VISAR), might be called the most important wave-profile diagnostics of the last decades.As the main concerns of shock and detonation research shift from macroscopic and phenomenological analysis to mesoscopic and intrinsic analysis, diagnosis technology with high time and space resolution is required, which encourages scientists to develop advanced velocimetry system.In this paper, the background of laser interferometer and several multi-point velocimeters are introduced. Based on the existing Line-imaging VISAR, researches on the implementation, Optical structure and technical parameters of Line&image VISAR have been done. And the data processing method-Fourier transform method has been discussed in detail, the causes of errors and corresponding measures are also analysed.Then the line-image VISAR is applied to two kinds of divergent detonation driving experiment. In the first experiment of driving a plane flyer, a transverse wave structure is observed on the three-dimensional velocity-time profile, and causes of this phenomena have been discussed. In the second experiment of driving a flyer with Zigzag trenches, nonuniformity on the free surface velocity profile of the flyer is observed.Finally, Numerical Simulations have been performed with the explicit finite element program LS-DYNA. The simulation results of the plane-flyer experiment are in quite good agreement with the experiment results; while the simulation results with zigzag trenches have the same characteristics with the experiment results, but differ slightly in magnitude. One possible cause is that the flyer deviates from the central axis.Results of this research indicate that the line-image VISAR can be used in surface velocity diagnosis of flyers with non-uniform structure in divergent detonation driving experiments.