Photoelectric device with capability to change threshold levels

Details Photoelectric device with capability to change threshold levels Photoelectric device with capability to change threshold levels

1995-01-24

1996-03-05

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356240, G01N 904

Patent

active

054969964

ABSTRACT:
A photoelectric sensor is provided with the capability of calculating a threshold magnitude based on a maximum light intensity received by a light sensitive device. The maximum value of the light intensity is determined during a preselected period of time when no object is blocking the path of a light beam. A second threshold magnitude is used to assist the present invention in determining the leading edge and trailing edge of a transparent object. The values of the first and second threshold magnitudes are updated dynamically as bottles pass through the path of the light beam. This permits the photoelectric sensor to react to changes in light intensity without providing false signals of bottles within the light path or missing bottles that are within the light path.

REFERENCES:
patent: 5008531 (1991-04-01), Ono et al.
patent: 5008532 (1991-04-01), Ono et al.
patent: 5301129 (1994-04-01), McKaughan et al.
patent: 5318172 (1994-06-01), Kenny et al.

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