Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1997-03-21
1998-09-01
Le, Que
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
2505594, 340556, G01V 904
Patent
active
058013768
ABSTRACT:
A photoelectric barrier and operation thereof, the barrier having at least two pairs of transmitters/receivers each operating synchronously. Each of the two transmitters transmits a light signal having a specific identifier, the signal being in the form of a double pulse separated by a pause, which double pulse consists of two pulse groups each separated by a pause, and each receiver then evaluates a light signal of the associated transmitter as correctly received when at least one of the two pulse groups is recognized as valid by means of the associated identifier, in which the duration of the pulse groups and the pauses between them are established so that at most one pulse group of one double pulse of the one transmitter is superimposed with one pulse group of one double pulse of the other transmitter.
REFERENCES:
patent: 4266124 (1981-05-01), Weber et al.
patent: 5130532 (1992-07-01), Clemens
Haberer Hermann
Haberl Paul
Lehner Werner
Le Que
Leuze lumiflex GmbH & Co.
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