G - Physics – 07 – D
Patent
G - Physics
07
D
G07D 7/04 (2006.01) G06K 7/08 (2006.01) G07D 7/00 (2006.01) G07F 7/08 (2006.01)
Patent
CA 2271791
A method for checking the authenticity of a security article (158) wherein the security article contains magnetic particles having a magnetic saturation field H s being greater than 100 A/m. The method comprises the following steps: (a) generating an alternating field of one or more fundamental frequencies; (b) subjecting an article (158) to be detected to said field; (c) detecting a detection signal emanating from said article to be detected; (d) examining the detection signal for the presence of any particular higher harmonics of said fundamental frequencies or of any linear combination of said fundamental frequencies and of said harmonics, said particular harmonics or said linear combination being indicative of the presence of said magnetic particles. The method is applied at point of transaction locations, where the article to be detected is brought into close proximity with a sensor.
L'invention concerne un procédé qui permet de vérifier l'authenticité d'un article de sécurité (158) contenant des particules magnétiques ayant un champ de saturation magnétique Hs supérieur à 100 A/m. Le procédé consiste à a) générer un champ alternatif d'une ou plusieurs fréquences fondamentales; b) soumettre audit champ (158) un article à authentifier; c) repérer un signal de détection émanant de l'article à authentifier; d) examiner le signal de détection pour déterminer la présence d'un quelconque harmonique particulier supérieur aux fréquences fondamentales ou à une quelconque combinaison linéaire desdites fréquences fondamentales et dudit harmonique, ledit harmonique particulier ou ladite combinaison linéaire pouvant indiquer la présence desdites particules magnétiques. Le procédé est réalisé dans des lieux dits "points de transaction" où l'article à authentifier est amené au voisinage immédiat d'un capteur.
Burrell Jon
Cross David
Fisher John
Robertson Paul
Kirby Eades Gale Baker
N.v. Bekaert S.a.
Pa International Consulting Services S.a.
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