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    • 3. 发明申请
    • ARTICLE RECOGNITION AND VERIFICATION
    • 文章识别和验证
    • WO9826377A3
    • 1998-07-23
    • PCT/EP9706969
    • 1997-12-08
    • BEKAERT SA NVPA CONSULTING SERVICESFISHER JOHNROBERTSON PAULBURRELL JONCROSS DAVID
    • FISHER JOHNROBERTSON PAULBURRELL JONCROSS DAVID
    • G06K7/08G07D7/00G07D7/04G07F7/08
    • G07F7/086G06K7/084G07D7/04
    • A method for checking the authenticity of a security article (158) wherein the security article contains magnetic particles having a magnetic saturation field Hs 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. 00000
    • 一种用于检查安全物品(158)的真实性的方法,其中所述安全物品包含磁饱和场Hs大于100A / m的磁性颗粒。 该方法包括以下步骤:(a)产生一个或多个基本频率的交变场; (b)使物品(158)被检测到所述场; (c)检测从所述待检测物品发出的检测信号; (d)检查所述检测信号是否存在所述基频的任何特定高次谐波或所述基频和所述谐波的任何线性组合,所述特定谐波或所述线性组合指示所述磁性颗粒的存在。 该方法应用于交易位置处,其中要检测的物品与传感器紧密接近。 00000