Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1995-05-05
1997-06-10
Allen, Stephone
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
2502061, 273378, 356 408, G01D 534, F41J 500
Patent
active
056378661
ABSTRACT:
The invention comprises a method, apparatus and equipment for detecting the hit location of a projectile passing through a target plane. A light source generates at least two zones of light which subtend between them a specified angle. The light zones sweep the target plane, illuminating a projectile crossing the target plane and casting a shadow of the projectile onto a screen, preferably a difuse, ground-glass screen. The screen shadow or image is detected by a spatially resolving photodetector, and the test signals so obtained are then analyzed as follows: the individual test signals from individual photodetector elements are integrated during one measurement cycle and the sum signals from individual detector elements so obtained are added or integrated into a final sum; the final sum is compared with a reference value; and in the event of a deviation from the reference value, the possibly darkened element of the photodetector is determined and the projectile location in the target plane is inferred therefrom.
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Dollansky Erich
Riener Karl S.
Allen Stephone
Lambert, Esq. Dennis H.
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