Photoelectronic apparatus

Details Photoelectronic apparatus Photoelectronic apparatus

1980-10-30

1983-06-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250214B, 250209, H01J 4014

Patent

active

043885284

ABSTRACT:
A photoelectronic apparatus, in which a photoelectric convertor (the operational convertor) receives a beam of light and produces an output signal proportional to the intensity of the light received, is protected against the effects of unwanted light by providing an auxiliary photoelectric convertor arranged in the vicinity of the operational convertor. The auxiliary convertor detects the presence of unwanted light and its output is subtracted from that of the operational convertor and the resultant signal is then examined to distinguish between events occuring in the light beam and events simulated by the unwanted light.

REFERENCES:
patent: 3028499 (1962-04-01), Farrall
patent: 3311748 (1967-03-01), Volpe et al.
patent: 3475613 (1969-10-01), Meyers
patent: 3486031 (1969-12-01), Lynch
patent: 3500049 (1970-03-01), Nutz
patent: 3521962 (1970-07-01), Tashiro et al.
patent: 3845319 (1974-10-01), Walter

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