Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1993-12-08
1996-03-19
Allen, Stephone B.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
2502031, H01L 2700
Patent
active
055005217
ABSTRACT:
In an optical sensor arrangement which is for use on a spacecraft in tracking an objective star and comprises an optical sensor comprising pixels for receiving starlight from the star to produce pixel output signals with or without dark currents, such dark currents are compensated for by a device which comprises (A) a projecting unit for projecting a real image of at least one star on a certain number of pixels, nine pixels in the illustrated simple example, to make the optical sensor produce sensor output signals a few times, such as five times, and (B) a processor unit for processing the processor output signals into compensating data for use in compensating for the dark currents. Preferably, the processor unit comprises a pixel address generator, a data memory, and a digital processor.
REFERENCES:
patent: 4412343 (1983-10-01), Kosonocky
patent: 4633075 (1986-12-01), Sakai et al.
patent: 4893185 (1990-01-01), Fukushima et al.
patent: 5027199 (1991-06-01), Suzuki
patent: 5216511 (1993-06-01), Tani
Patent Abstracts of Japan, JP-A-60 165 563, Aug. 28, 1985, vol. 10, No. 9 (P-420) (2066) Jan. 14, 1986.
Allen Stephone B.
NEC Corporation
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