Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1995-05-23
1997-03-04
Le, Que T.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
2505594, 2502221, 340556, 356385, H01J 4014
Patent
active
056082070
ABSTRACT:
A sensor system is provided with an amplifier that has as an input signal received from a light sensitive component. The output of the amplifier is determined by its gain factor. The output of the amplifier is continually monitored to determine whether it is in acceptable limits. When a change is required, a variable potentiometer is affected to change its resistance. The variable potentiometer is included as part of a feedback loop of the amplifier and, therefore, a change in its resistance will change the gain factor of the amplifier and achieve the appropriate magnitude of output signal from the amplifier. The system can be operated in either a pushbutton mode or an automatic gain control mode. In the pushbutton mode, the system responds to an operator request for a setup procedure to be accomplished. In the automatic gain control mode, the system determines when an object is not present within a detection zone and, using the presently received signal magnitudes, determines the necessary change in gain factor to achieve a signal with an acceptable magnitude. A digital potentiometer is affected in order to change its resistance which is included as an incremental part of the feedback loop of an amplifier.
REFERENCES:
patent: 3522739 (1970-08-01), Coor et al.
patent: 3910701 (1975-10-01), Henderson et al.
patent: 4655349 (1987-04-01), Joseph et al.
Allen Barbara A.
Klein David A.
Kong Hongzhi
Honeywell Inc.
Lanyi William D.
Le Que T.
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