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Barkhausen noise as an intrinsic fingerprint for ferromagnetic components

机译：Barkhausen噪音作为铁磁组分的内在指纹

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In this work, the suitability of magnetic Barkhausen noise as an intrinsic fingerprint of ferromagnetic components is determined. This technique has potential for this application because it is based inherently on the near surface microstructural features of ferromagnetic materials. All materials typically display some variation in their microstructure simply as a result of the manufacturing process (rolling, heat treating, welding, grinding), thus providing the potential that Barkhausen noise measurements between nominally similar components will be unique. In this work, we demonstrate that Barkhausen noise measurements are both repeatable in time for a single sample made from a ferromagnetic material, and unique across a number of instances of nominally similar samples. The results of this work have profound implications in a variety of applications in forensics and physical security. For example, consider the fabrication of the next generation of tamper-evident containers and devices using conventional processes for steel. In addition, since Barkhausen noise is sensitive to changes in microstructures due to grinding and welding, these measurements can be used to detect clandestine repairs and tampering. Finally, because the method inherently results in a time series measurement at each point on a sample, it is expected to have far higher dimensionality than physically similar eddy current measurement. However, the higher dimensionality of Barkhausen measurements suggest that they should be harder to counterfeit than eddy current measurements.
机译：在这项工作中，确定了作为铁磁性部件的内在指纹的磁性巴克豪森噪声的适用性。该技术具有本申请的潜力，因为它本质基于铁磁材料的近表面微观结构特征。所有材料通常由于制造过程（轧制，热处理，焊接，磨削）而言，所有材料通常都仅显示它们的微观结构的一些变化，从而提供了名义上类似的部件之间的Barkhausen噪声测量将是独特的。在这项工作中，我们证明巴克豪森噪声测量既可重复于由铁磁材料制成的单个样品，并且在许多标称相似样品的情况下独特。这项工作的结果在取证和物理安全方面的各种应用中产生了深远的影响。例如，考虑使用钢的常规方法的下一代篡改篡改容器和装置的制造。此外，由于Barkhausen噪声对由于研磨和焊接引起的微观结构的变化敏感，因此可以使用这些测量来检测秘密修理和篡改。最后，因为该方法固有地导致样品上每个点的时间序列测量，所以预期比物理上类似的涡流测量值远远高。然而，Barkhausen测量的更高维度表明它们应该比涡流测量更难以伪造。

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