Device and process for magnetic material detection in...

G - Physics – 08 – B

Patent

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G08B 13/24 (2006.01)

Patent

CA 2643793

The present invention relates to a device with its related electronic circuit and to a detection process, targeted to detect any magnetic material moving around the antennas/sensors (6) used in Electronic Article Surveillance (EAS) electromagnetic systems, which can by internally or externally coupled to these kind of anti-theft systems, significantly decreasing its current vulnerability to fraud, since the current Electronic Article Surveillance (EAS) electromagnetic systems are vulnerable for not being able to detect magnetic materials. The present process and detector device suppress that vulnerability by correctly filtering and processing the DC signal generated by the displacement of a magnetic material around one or more EAS electromagnetic system antenna/sensor(s) (6). Magnetic material detection is achieved from a differential signal existing in the antenna/sensor (6) receiver element of said EAS electromagnetic system, which is forwarded to the control unit (7) of said system, where there are coupled a device comprising a "n" order filter (1), a buffer or insulator circuit (2), a sensitivity adjuster or gain control circuit (3), a control logic (4) and an alarm module (5).

L'invention porte sur un dispositif, le circuit électronique associé et un procédé de détection, permettant de détecter tout matériau magnétique gravitant autour des antennes de détection (6) de systèmes électromagnétiques de surveillance électronique d'articles (EAS), et pouvant se coupler intérieurement ou extérieurement à ces systèmes antivol pour réduire leur vulnérabilité à la fraude, lesdits systèmes étant actuellement vulnérables puisque non capables de détecter les matériaux magnétiques. Ledit procédé et le détecteur associé pallient à cette vulnérabilité en filtrant et traitant le signal C.C. créé par le déplacement d'un matériau magnétique autour de l'antenne de détection (6) d'un système EAS. La détection d'un matériau magnétique se fait à partir du signal différentiel existant entre l'élément récepteur de l'antenne de détection du système EAS transmis à l'unité de gestion (7) dudit système auquel est couplé un dispositif comprenant: un filtre d'ordre n (1), un circuit tampon ou d'isolement (2), un circuit de réglage de sensibilité ou de gain (3), une logique de gestion (4), et un module d'alarme (5).

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