Light barrier and method for the operation of a light barrier

Details Light barrier and method for the operation of a light barrier Light barrier and method for the operation of a light barrier

G - Physics

01

V

G01V 8/20 (2006.01)

Patent

CA 2747881

A light barrier having a signal path (1) between a first transceiver arrangement (2), emitting a signal beam (4), and a mirror, returning the incident signal beam (4), allows reliable operation even when the length is great and under changing ambient conditions by virtue of the mirror being in the form of a second transceiver arrangement (3) and by virtue of both transceiver arrangements (2, 3) having a receiver (6), a controllable and encodable transmitter (8) and an evaluation and control device (7), connected to the receiver (6), for evaluating the intensity and an encoding of the received signal beam (4, 5) and for controlling the intensity and encoding of the emitted signal beam (4, 5), wherein the encoding is performed using a piece of information about the intensity of the received signal beam (4, 5).

La présente invention concerne une barrière lumineuse comprenant une trajectoire de signal (1) entre un premier dispositif d'émission-réception (2) émettant un faisceau de signaux (4) et un miroir renvoyant le faisceau de signaux (4) qui le frappe, la barrière lumineuse ayant un fonctionnement fiable même dans le cas d'une longueur importante et de conditions environnementales variables. A cet effet, le miroir se présente sous la forme d'un deuxième dispositif d'émission-réception (3) et les deux dispositifs d'émission-réception (2, 3) présentent un récepteur (6), un émetteur (8) qui peut être commandé et peut être codé et un dispositif d'évaluation et de régulation (7) raccordé au récepteur (6) et destiné à évaluer l'intensité et le codage du faisceau de signaux (4, 5) reçu et à réguler l'intensité et le codage du faisceau de signaux (4, 5) émis, le codage s'effectuant au moyen d'informations relatives à l'intensité du faisceau de signaux (4, 5) reçu.

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