Photoelectric-piezoelectric velocity and impact sensor
US4770527A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 2, 1987 |
| Grant date | Sep 13, 1988 |
| Priority date | — |
| Expiry date | Feb 2, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63B2069/0006
- WIPO fieldFurniture, games
- WIPO sectorOther fields
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 in…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.