Variable beam detection using a dynamic detection threshold

Details Variable beam detection using a dynamic detection threshold Variable beam detection using a dynamic detection threshold

1994-10-25

1996-10-22

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250214B, 340556, G01V 904

Patent

active

055679315

ABSTRACT:
An apparatus for detecting obstructions includes a plurality of emitters for radiating beams of energy, a plurality of detectors for providing detector signals in response to the beams of energy radiated by the plurality of emitters and a controller for determining if the beams of energy are obstructed by analyzing the detector signals and implementing a dynamic detection threshold. The controller generates an average beam strength and current beam strength from which said controller means determines if an obstruction is present by determining if the current beam strength is within a predetermined range of the average beam strength.

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