Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1994-05-24
1996-04-16
Allen, Stephone B.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250214B, 49 26, 340555, G01J 132, H01J 4014
Patent
active
055085113
ABSTRACT:
Environmental variations in ambient light and temperature are eliminated in arrangements for and methods of detecting objects in areas exposed to such variations by generating a differential measurement value indicative of the difference between two signals derived from two light sources, both signals being affected in the same way and extent by the environmental variations.
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Gurner Asaf
Miremadi Reza
Shaw John A.
Zur Oded Y.
Allen Stephone B.
Interactive Light Inc.
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