Method for the operation of an optoelectronic sensor

Details Method for the operation of an optoelectronic sensor Method for the operation of an optoelectronic sensor

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.

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