Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1991-12-09
1994-08-23
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250226, 315158, G01J 132
Patent
active
053409744
ABSTRACT:
A light source (12) emits radiation which is maintained at a desired intensity by use of a photodetector which views the radiation and has a fixed relationship between incident radiation and output photodetector (18) current. Intensity of the radiation is established by varying electric current applied to the source, via a feedback loop (42, 24, 22, 34), to attain a reference value of the photodetector current, the photodetector current being representative of the desired value of radiation intensity. This procedure may be performed first in an air environment with a specific optical assembly of source and photodetector to establish the reference value of photodetector current for a desired value of radiation intensity. Thereupon, the optical system may be operated in a vacuum environment, and a monitoring of the photodetector current establishes the desired value of radiation intensity. Alternatively, the source is operated at a fixed value of excitation current, and an iris (44) or other radiation attenuator is operated to produce the reference value of photodetector current.
REFERENCES:
patent: 3945731 (1976-03-01), Graser, Jr.
patent: 3996494 (1976-12-01), Suga
patent: 4310249 (1982-01-01), Kramer
patent: 4737029 (1988-04-01), Yabusaki et al.
Denson-Low Wanda K.
Hughes Aircraft Company
Nelms David C.
Sales Michael W.
Shami K.
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