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    • 10. 发明授权
    • Magnetic detection of security articles
    • 安全物品的磁性检测
    • US5992741A
    • 1999-11-30
    • US987047
    • 1997-12-10
    • Paul Andrew RobertsonJohn FisherJonathan BurrellPierre Doublet
    • Paul Andrew RobertsonJohn FisherJonathan BurrellPierre Doublet
    • H01F1/14B42D15/10B42D107/00G01R33/12G06K7/08G07D7/00G07D7/04G07F7/08H01F1/03
    • G06K7/084G07D7/04G07F7/08G07F7/086
    • A method for detecting the presence of magnetic elongated particles in a substrate the base material of which has magnetic properties substantially differing from the corresponding magnetic properties of the elongated particles. The elongated particles have such a long and thin form that their demagnetisation factor N is smaller than 1/250, they have a diameter smaller than 30 micrometer and a magnetic saturation field greater than 100 A/m. The method comprising the following steps:(a) emitting an electromagnetic source signal of one or more particular base frequencies to the substrate so that any present magnetic elongated particles go into a non-linear part of their B-H curve for at least part of a cycle of the source signal;(b) detecting an electromagnetic detection signal emanating from the substrate;(c) testing the detection signal for the presence of particular higher harmonics of the base frequencies or of any linear combination of the base frequencies or of the harmonics, the particular higher harmonics being indicative of the presence of the magnetic elongated particles.
    • 一种用于检测基材中的磁性细长颗粒的存在的方法,其基材具有与细长颗粒的相应磁性能基本上不同的磁性能。 细长的颗粒具有这样的长而薄的形式,使它们的去磁因子N小于+ E,fra 1/250 + EE,它们的直径小于30微米,磁饱和场大于100A / m。 该方法包括以下步骤:(a)向衬底发射一个或多个特定基本频率的电磁源信号,使得任何存在的磁性细长颗粒进入至少部分循环的BH曲线的非线性部分 的源信号; (b)检测从所述基板发出的电磁检测信号; (c)测试检测信号是否存在基频的特定高次谐波或基频或谐波的任何线性组合,特定高次谐波表示存在磁细长颗粒。