Photoelectric sensor with variable light pulse frequency

Details Photoelectric sensor with variable light pulse frequency Photoelectric sensor with variable light pulse frequency

1993-04-20

1994-07-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250223R, G01V 904

Patent

active

053311507

ABSTRACT:
A photosensor is provided with a control circuit that is capable of varying the frequency of light pulses which energize a light source of the sensor. When four consecutive light pulses result in an identical status of a light sensitive component, the frequency of light pulses is slowed to conserve energy. However, when a change in state is recognized by the circuitry of the present invention, the frequency of light pulses is increased in order to more rapidly determine whether or not a change of status has actually occurred. This permits the photoelectric sensor to conserve energy while also being able to rapidly determine whether or not the light path of the photoelectric sensor has changed state from obstructed to unobstructed or, conversely, from unobstructed to obstructed.

REFERENCES:
patent: 4267443 (1981-05-01), Carroll et al.
patent: 5115129 (1992-05-01), Johnson
patent: 5250801 (1993-10-01), Grozinger et al.
patent: 5262636 (1993-11-01), Rink

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