A multipoint velocity interferometer system for any reflector (VISAR) has been developed which can simultaneously measure velocity versus time histories of two to six points on a target or different objects during dynamic compression. A single-frequency laser beam is divided into two to six individual beams that are transmitted into an experimental device by incident fibers to illuminate measured points. Diffusely reflected laser beams from different measured points are separately collected by fiber detectors and guided by signal fibers into a common “push and pull” interfering cavity with the same delay etalon to interfere. This not only simplifies the system structure and the experimental operation, but also eliminates the system error among measured points and makes the system almost as small in volume as that of a single-point VISAR. The multipoint VISAR possesses all the advantages of the traditional single-point VISAR as well as the temporal and the space resolution ability. We have used it to monit...
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