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NDT Techniques Using Barkhausen Effect and Its New Development in Industrial Applications

机译：使用Barkhausen效应的NDT技术及其在工业应用中的新发展

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摘要

Barkhausen effect is a phenomenon, which is caused by a series of irreversible magnetization process, such as domain walls passing through pinning sites in ferromagnetic materials. In a magnetization curve (M vs. H), it is exhibited as a series of "jump" changes for magnetization M. The internal stress, cracks, non-magnetic impurities are main factors which cause irreversible magnetization changes. Using a specially designed instrument, the discontinuous change in M can be converted into an electronic signal, such as voltage pulses. After amplification and signal processing, it can be displayed to analyze the distribution of internal stress, grain sizes, impurities, dislocations, cracks etc. in magnetic materials. Therefore, Barkhausen effect is a very effective tool for non-destructive testing (NDT) in industrial field, such as steel bridges, rails, ships, aircrafts and pressure containers. In this contribution, we discuss the correlations between the Barkhausen signals and internal stress, cracks, grain sizes, or impurities in magnetic material (carbon steels on most occasions), the technique to interpret the Barkhausen signals, its new applications in industries and the NDT instruments to detect Barkhausen signals.
机译：Barkhausen效应是一种现象，它是由一系列不可逆的磁化过程引起的，例如通过铁磁材料中的钉扎位点的畴壁。在磁化曲线（M vs.H）中，其作为磁化M的一系列“跳跃”变化。内部应力，裂缝，非磁性杂质是导致不可逆磁化变化的主要因素。使用专门设计的仪器，M的不连续变化可以转换为电子信号，例如电压脉冲。放大和信号处理后，可以展示它以分析磁性材料中内应力，粒度，杂质，脱位，裂缝等的分布。因此，Barkhausen效果是工业领域的非破坏性测试（NDT）的非常有效的工具，如钢结构，轨道，船舶，飞机和压力容器。在这一贡献中，我们讨论了磁性材料（大多数情况下碳钢的内部应力，裂缝，粒度，杂质之间的相关性，这项技术解释了Barkhausen信号的技术，其在行业和NDT中的新应用仪器检测Barkhausen信号。

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