Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1992-12-30
1994-01-25
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250214A, 340556, G01V 904
Patent
active
052818101
ABSTRACT:
A photoelectric control unit including an electronic system having a system architecture which is adapted for allowing the unit to readily and accurately determine its own operating margin. This architecture system includes a pair of variable gain modules which operate in conjunction with a pair of separate signal channels. The signal channels have comparators for comparing signal amplitudes on their respective channels with a common reference level. Operating margin values are determined by varying the gain of the amplification modules and tracking the output from the comparators on the signal channels. The photoelectric control unit can then use operating margin values to automatically set the system gain and thereby adjust the sensitivity of the unit for optimum performance.
REFERENCES:
patent: 4906832 (1990-03-01), Beeckel
patent: 5008531 (1991-04-01), Ono et al.
Delaney, III Patrick J.
Fooks Elik I.
Johnson Philip E.
Allen-Bradley Company Inc.
Hamann H. Frederick
Horn John J.
Le Que T.
Nelms David C.
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