Comparison of Multi-Channel VISAR and Electric Probe Technology in Measuring Free-Surface Velocity of Metal Flyer

Parameters of high speed object are often measured by multi-channel velocity interferometer system for any reflector (VISAR) or electric probe technology. In order to validate experimental results, and analyze test system factors affecting measurement precision, the free-surface velocity history of metal flyer driven by detonation was measured by multi-channel VISAR and electric probes. The displacement-time curve of metal flyer was calculated from the measured velocity-time curve, and then contrasted with the results measured by electric probes. Experimental results show that all v-t curves measured by multi-channel VISAR are coincident well within the maximum difference of 1.45%. And the maximum difference of time at 5, 10, 15 mm standoff measured by VISAR and electric probe is respectively 0.02, 0.02, 0.07 s after modified. The difference between two sets of system at the same position increases with the movement distance of flyer, it could be resulted from the increased waveform difference of the explosive lens with the flight distance of flyer.