Improvements in or relating to traffic control systems

Details Improvements in or relating to traffic control systems Improvements in or relating to traffic control systems

G - Physics

08

G

G08G 1/123 (2006.01) G08B 13/191 (2006.01) G08G 1/04 (2006.01) G08G 1/07 (2006.01) G08G 1/08 (2006.01)

Patent

CA 2206989

A traffic light control system comprises a passive infra-red presence detection system for detecting the presence of a target emitting infra-red radiation, which comprises a pyro-electric detector including an array of pyro-electric sensor elements. The pyro-electric detector is arranged to generate a signal representative of movement of the target within a detection zone of the detector. By providing a signal processing unit which operates to analyse pulses present in the signal, the said presence detection system is provided with a means whereby it can not only detect movement of the target within the detection zone but also whether that target has moved into and stopped within the detection zone.

L'invention est un contrôleur de feu de signalisation comportant un dispositif passif pouvant détecter la présence d'une cible émettant un rayonnement infrarouge, ce dispositif ayant un détecteur pyroélectrique contenant un réseau de capteurs pyroélectriques. Le détecteur pyroélectrique est monté de façon à produire un signal représentant le mouvement de la cible dans son aire de détection. Étant doté d'une unité de traitement qui analyse les impulsions présentes dans le signal, le dispositif de détection peut non seulement détecter les mouvements de la cible dans l'aire de détection, mais peut également déterminer si la cible a pénétré dans l'aire de détection et s'y est arrêtée.

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