Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1996-04-16
1997-04-15
Allen, Stephone
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250214AG, 250214C, 250221, G01J 132, H01J 4014
Patent
active
056212054
ABSTRACT:
The disclosed invention is a photoelectric sensor that is capable of resolving difficult low contrast sensing tasks by adjustment of the sensor's light source intensity, so as to prevent dark state saturation and extend the overall dynamic range of the sensor. The photosensor utilizes an enhanced dynamic (EDR.TM.) control circuit that combines the light source and offset adjustment of the DC amplifier circuit in a closed loop configuration. This connection provides an automatic reduction in the light source intensity as required to avoid saturation. Further, this is accomplished without sacrificing amplifier gain, so that the dynamic operating range of the photosensor is extended to include proper operation at very bright light levels. The EDR control circuit also includes an indicator circuit that is connected to the light intensity control circuit. The indicator circuit provides the user an indication of where in the overall dynamic range of the photosensor the offset adjustment of the DC amplifier has been set.
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Smith Grant L.
Warner Robert A.
Allen Stephone
Tri-Tronics Company, Inc.
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