Eas magnetic elements with different frequency ranges

G - Physics – 08 – B

Patent

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Details

G08B 13/24 (2006.01) G01V 15/00 (2006.01)

Patent

CA 2298488

The invention is directed to a security element (3) for the elec-tronic surveillance of articles. The object underlying the invention is to propose a security element that is detecting by surveillance system (S1, S2) operating in different fre-quency ranges (F1, F2). Accord-ing to an embodiment of the secu-rity element of the invention, this object is accomplished by the fol-lowing features: it is comprised of at least two materials (1; 2) of high permeability which, when excited by an external alternating magnetic field (H), emit each a characteristic signal (signal 1; signal 2); the max-imum signal components of the two materials (1; 2) lie in differ-ent frequency ranges (F1; F2); and the signal components of the one material (1; 2) are negligibly low in that particular frequency range (F2; F1) in which the signal com-ponent of the other material (2; 1) is at a maximum lever.

L'invention concerne un élément de sécurité (3) conçu pour la surveillance électronique d'articles. Son but est de proposer un élément de sécurité détecté par des systèmes de surveillance (S1, S2) fonctionnant dans des plages de fréquence différentes (F1, F2). D'après un mode de réalisation de cet élément de sécurité, ce but est atteint grâce aux caractéristiques suivantes: l'élément de sécurité est composé d'au moins deux matériaux (1, 2) présentant une perméabilité élevée et émettant chacun, quand ils sont excités par un champ magnétique alternatif extérieur (H), un signal caractéristique (signal 1; signal 2); les composantes maxima de signal des deux matériaux (1, 2) sont situées dans des plages de fréquence différentes (F1, F2); les composantes de signal d'un des matériaux (1, 2) sont limitées de façon négligeable dans cette plage particulière de fréquence (F1, F2) dans laquelle la composante de signal de l'autre matériau (2, 1) se trouve à un niveau maximum.

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