Particle Velocimeter for Use Close-in to Underground Explosions

摘要

Details of the engineering effort expended in the development of a particle velocimeter for use close-in to an underground explosion are presented. The Faraday and mutual-induction particle velocimeter concepts (originally described in DASA 1431) are examined in greater detail, both theoretically and experimentally. It was found experimentally that the gage operates fully in accord with the theoretical expectations discussed in DASA 1431. An expression is derived for the error (as a function of time) inherent in the measure of particle velocity provided by the mutual induction gage (under the assumption that the shockwave is a step function in pressure, temperature, and shock and particle velocities). The laboratory and field tests conducted with prototype gages are discussed, the results obtained are explained, and the instrumentation designed and used is described. (Author)