Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1998-07-08
2000-09-19
Le, Que T.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250223B, 3562394, G06M 700
Patent
active
061216054
ABSTRACT:
The invention relates to a method of operating an optoelectronic sensor, in particular a light barrier, in which a light signal is sent by means of a light transmitter into a monitored region, and a light receiver designed to receive transmitted and reflected light signals delivers a reception signal, the amplitude of which is investigated for the presence of an object in the monitored region, with an article detection signal being transmitted if a recognition threshold is exceeded or fallen short of, characterized in that a plurality of switching threshold values are preset, with a switching signal being triggered when the received signal exceeds or falls short of these switching threshold values, in that the number of the switching signals which arise with respect to each switching threshold is found; and in that the recognition threshold value and the switching threshold values are set or adjusted in dependence on the numbers found.
REFERENCES:
patent: 4428674 (1984-01-01), Giebel et al.
patent: 4672837 (1987-06-01), Cottrell
patent: 5496996 (1996-03-01), Barnes et al.
Blumcke Thomas
Kietz Daniel
Waslowski Kai
Le Que T.
Luu Thanh X.
Sick AG
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