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1. 发明申请

WO9826378A3 MAGNETIC DETECTOR FOR SECURITY DOCUMENT 审中-公开
标题翻译：用于安全文件的磁性探测器
公开(公告)号：WO9826378A3
公开(公告)日：1998-07-30
申请号：PCT/EP9706970
申请日：1997-12-08
申请人： BEKAERT SA NV , PA CONSULTING SERVICES , ROBERTSON PAUL , FISHER JOHN , BURRELL JOHN
发明人： ROBERTSON PAUL , FISHER JOHN , BURRELL JOHN
IPC分类号： G06K7/08 , G07D7/00 , G07D7/04 , G07F7/08
CPC分类号： G07F7/086 , G06K7/084 , G07D7/04
摘要： An apparatus 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 apparatus comprising: (a) means for emitting an electromagnetic source signal of one or more particular base frequencies to said 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) means for detecting an electromagnetic detection signal emanating from said substrate; (c) means for testing the detection signal for the presence of particular higher harmonics of said base frequencies or of any linear combination of said base frequencies or of said harmonics, said particular highher harmonics being indicative of the presence of said magnetic elongated particles. 00000
摘要翻译：一种用于检测基材中的磁性细长颗粒的存在的装置，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，使其去磁因子N小于1/250，它们的直径小于30微米，磁饱和场大于100A / m。该装置包括：（a）用于向所述衬底发射一个或多个特定基本频率的电磁源信号的装置，使得任何存在的磁性细长颗粒进入它们的BH曲线的非线性部分中至少部分循环源信号; （b）用于检测从所述衬底发出的电磁检测信号的装置; （c）用于测试所述检测信号以存在所述基频或所述基频或所述谐波的任何线性组合的特定高次谐波的存在，所述特定高次谐波指示所述磁细长颗粒的存在。 00000

2. 发明申请

WO1998026378A2 MAGNETIC DETECTOR FOR SECURITY DOCUMENT 审中-公开
标题翻译：用于安全文件的磁性探测器
公开(公告)号：WO1998026378A2
公开(公告)日：1998-06-18
申请号：PCT/EP1997006970
申请日：1997-12-08
申请人： N.V. BEKAERT S.A. , PA CONSULTING SERVICES LTD. , ROBERTSON, Paul , FISHER, John , BURRELL, John
发明人： N.V. BEKAERT S.A. , PA CONSULTING SERVICES LTD.
IPC分类号： G07D07/00
CPC分类号： G07F7/086 , G06K7/084 , G07D7/04
摘要： An apparatus 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 apparatus comprising: (a) means for emitting an electromagnetic source signal of one or more particular base frequencies to said 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) means for detecting an electromagnetic detection signal emanating from said substrate; (c) means for testing the detection signal for the presence of particular higher harmonics of said base frequencies or of any linear combination of said base frequencies or of said harmonics, said particular highher harmonics being indicative of the presence of said magnetic elongated particles.
摘要翻译：一种用于检测基材中的磁性细长颗粒的存在的装置，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，使其去磁因子N小于1/250，它们的直径小于30微米，磁饱和场大于100A / m。该装置包括：（a）用于向所述衬底发射一个或多个特定基本频率的电磁源信号的装置，使得任何存在的磁性细长颗粒进入它们的BH曲线的非线性部分中至少部分循环源信号; （b）用于检测从所述衬底发出的电磁检测信号的装置; （c）用于测试所述检测信号以存在所述基频或所述基频或所述谐波的任何线性组合的特定高次谐波的存在，所述特定高次谐波指示所述磁细长颗粒的存在。

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