Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1987-02-02
1988-09-13
Buczinski, Stephen C.
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
73379, 2502221, 273181H, 273182R, 273184R, 273185R, 273 26A, G01P 336, A63B 6936
Patent
active
047705272
ABSTRACT:
A photoelectric-piezoelectric velocity and impact sensor has a plurality of photoelectric light sources and associated photodetectors disposed on axes defining an array of light beams. A first electronic circuit is operatively coupled to the photodetectors for generating a signal representative of the moment in time when at least one light beam of the array is broken by a projectile passing through the array. A substantially planar transducer is disposed coplanar with and spaced apart from the array for generating a signal when the projectile strikes the transducer after passing through the array. A second electronic circuit responsive to the signal from the transducer is provided for generating a signal representative of the moment in time when the projectile strikes the transducer. A calculating circuit responsive to the signal from the first circuit and the signal from the second circuit is provided for calculating the velocity of the projectile as a function of the time difference between the signals. The transducer may be divided into a plurality of distinct independent zones, each adapted to generate a signal only when struck by the projectile. If the transducer is divided into zones, a third electronic circuit is provided for generating a signal representative of the zone struck by the projectile.
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Buczinski Stephen C.
Pennwalt Corporation
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