Fence sensor

G - Physics – 08 – B

Patent

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Details

G08B 13/26 (2006.01)

Patent

CA 2336131

A reliable fence sensor that requires neither current for generating electric fields nor infrared rays. This sensor comprises a detection electrode (8), a reference electrode (9) insulated from the detection electrode (8), a charging member (4) insulated from the detection electrode (8) and the reference electrode (9) and consisting of a conductor located at least in part in the effective area of the detection electrode (8), and a detector circuit (20) which detects the change in the capacitance between the detection electrode and the reference electrode because of the existence of an object to be detected.

On décrit un capteur de clôture fiable qui ne nécessite pas de courant pour générer des champs électriques ni de rayons infrarouges. Ce capteur comprend une électrode (8) de détection, une électrode (9) de référence isolée de l'électrode (8) de détection, un élément (4) de charge qui est isolé de l'électrode (8) de détection et de l'électrode (9) de référence et qui est constitué d'un conducteur situé au moins partiellement dans la zone efficace de l'électrode (8) de détection, et un circuit (20) de détection qui détecte la variation de la capacitance entre l'électrode de détection et l'électrode de référence en raison de la présence d'un objet à détecter.

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