A combined microwave cavity and photographic diagnostic for high-speed projectiles has been developed. The diagnostic allows consistent determination of projectile mass and shape and serves as one fiducial mark for a speed measurement. The 3.219-GHz cavity has been used for experiments with both frozen deuterium and plastic pellets traveling at speeds from 1500–4500 m/s.
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Gouge et al. (1990) studied this question.
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