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Microvelocity sensor for instantaneous velocity determination

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4 Author(s)
Zee, R.H. ; Materials Engineering Curriculum, Department of Mechanical Engineering, Auburn University, Auburn, Alabama 36849 ; Jang, B.Z. ; Mount, A. ; Wang, C.J.

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A new microvelocity sensor unit was developed to measure the instantaneous velocity of a high velocity impactor during the penetration process. The concept of this device is based on the induced current generated in a coil due to the passage of a magnet. A special digital circuit was designed to yield a spatial resolution of better than 0.05 in. by eliminating the problem of signal overlap. The precise time delays obtained from these signals can be used to determine the slowing down or energy loss of a high‐velocity projectile. The details of this sensor unit will be described and its resolution will be demonstrated. A light gas gun was used to propel aluminum projectiles to velocities up to 320 m/s. Energy loss of these high‐velocity projectiles in composites reinforced with polyethylene, polyester, and graphite fabrics as well as pure Kevlar fabric was measured using this system. Results show that this microvelocity sensor is capable of identifying various energy‐loss processes during the impact of high‐velocity projectiles.

Published in:

Review of Scientific Instruments  (Volume:60 ,  Issue: 12 )

Date of Publication:

Dec 1989

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