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    • 9. 发明授权
    • Harmonic-based verifier device for a magnetic security thread having
linear and non-linear ferromagnetic characteristics
    • 用于具有线性和非线性铁磁特性的磁安全线的基于谐波的验证器装置
    • US5614824A
    • 1997-03-25
    • US441533
    • 1995-05-15
    • Andrew DamesDavid ElyColin Ager
    • Andrew DamesDavid ElyColin Ager
    • G01N27/72G01R33/12G06K7/08G07D7/00G07D7/02G07D7/04G08B13/24
    • G07D7/04
    • A security thread for use in a paper-based value document, such as currency or banknote paper, includes a plastic substrate coated with one or more regions of "soft" magnetic material. A device for verifying both the authenticity and the denomination of the document includes a coil that is driven by an alternating current to thereby provide a uniform magnetic field within a predetermined spatial region. As the document passes in proximity to the drive coil, the applied magnetic field saturates the regions of magnetic material on the security thread. The magnetic regions provide a response magnetic field that, because of the saturation of the magnetic regions, is a non-linear response containing a multiple of frequency components, including a component at the fundamental or drive frequency and various harmonic frequency components. A receive coil senses the response magnetic field. A signal processor connected to the receive coil utilizes the response signals at the fundamental frequency and the low-order harmonic frequencies to determine both the type of magnetic material on the security thread and the denomination of the document from the spatial distribution of the magnetic regions on the security thread.
    • 用于基于纸张的价值文档(例如货币或钞票纸)中的安全线程包括涂覆有一个或多个“软”磁性材料区域的塑料基板。 用于验证文件的真实性和面额的装置包括由交流电驱动从而在预定空间区域内提供均匀磁场的线圈。 当文档经过驱动线圈附近时,所施加的磁场使安全线上的磁性材料的区域饱和。 磁性区域提供响应磁场,由于磁性区域的饱和,该响应磁场是包含多个频率分量,包括基波或驱动频率的分量以及各种谐波频率分量的非线性响应。 接收线圈感应响应磁场。 连接到接收线圈的信号处理器利用基频和低次谐波频率的响应信号来确定安全线上的磁性材料的类型和来自磁区的空间分布的文档面值 安全线程。