G - Physics – 08 – B
Patent
G - Physics
08
B
G08B 13/22 (2006.01) G08B 13/24 (2006.01)
Patent
CA 2200533
An electronic article surveillance system includes generating circuitry for generating an interrogation signal. The generating circuitry includes an interrogation coil for radiating the interrogation signal in an interrogation zone. A marker is secured to an article appointed for passage through the interrogation zone, and includes an active element for generating a marker signal including harmonic signal components at harmonics of an operating frequency of the generating circuitry. Detecting circuitry detects the harmonic signal components of the marker signal generated by the active element. The generating circuitry generates the interrogation signal in the form of discrete pulses and the detecting circuitry is operated concurrently with the generating circuitry.
Système électronique de surveillance d'articles comprenant un circuit de génération qui produit un signal d'interrogation. Le circuit est doté d'une bobine servant à faire rayonner le signal d'interrogation dans une zone d'interrogation. Un marqueur, fixé sur un article destiné à passer dans la zone d'interrogation, comprend un élément actif qui génère un signal comprenant des composantes harmoniques constituées d'harmoniques de la fréquence de fonctionnement du circuit de génération. Un circuit de détection repère les composantes harmoniques du signal généré par l'élément actif du marqueur. Le circuit de génération produit un signal d'interrogation sous la forme de pulsations discrètes et le circuit de détection est conçu pour fonctionner en même temps que le circuit de génération.
Sensormatic Electronics Corporation
Smart & Biggar
LandOfFree
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