发明名称 |
Article recognition and verification |
摘要 |
A method for checking the authenticity of a security article of the type containing magnetic particles having a magnetic saturation field Hs being greater than 100 A/m. The method includes the following steps: (a) generating an alternating field of one or more fundamental frequencies; (b) subjecting an article to be detected to the field; (c) detecting a detection signal emanating from the article to be detected; and (d) examining the detection signal for the presence of any particular higher harmonics of the fundamental frequencies or of any linear combination of the fundamental frequencies and of the harmonics, the particular harmonics or the linear combination being indicative of the presence of the 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.
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申请公布号 |
US6598793(B1) |
申请公布日期 |
2003.07.29 |
申请号 |
US19990308566 |
申请日期 |
1999.06.30 |
申请人 |
N.V. BEKAERT S.A. |
发明人 |
FISHER JOHN;ROBERTSON PAUL;BURRELL JON;CROSS DAVID |
分类号 |
G06K7/08;G07D7/00;G07D7/04;G07F7/08;(IPC1-7):G06K7/08 |
主分类号 |
G06K7/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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