Magnetic Barkhausen Noise (MBN) detection technology shows great potential in the pipeline detection of stress, microstructure, and fatigue damage. However, in actual application, some pipes such as those near power plant are exposed to external magnetic fields or contain remanence. The presence ofthese magnetic fields will affect MBN features and then influence the testing results. To investigate the effect of DC magnetic field on MBN signal characteristics, theoretical analysis and experimental verification were carried out in this paper. It is found that the intensity and direction of the DC magnetic field have great effects on MBN signal characteristics, including the changes in the energy of MBN signal, the peak position and the shape of MBN signal profile.

中文翻译：

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直流磁场对巴克豪森磁噪声的信号特性的影响

巴克豪森磁性噪声（MBN）检测技术在管道应力，微结构和疲劳损伤检测中显示出巨大潜力。然而，在实际应用中，某些管道（例如电厂附近的管道）暴露于外部磁场或含有剩磁。这些磁场的存在会影响MBN功能，然后影响测试结果。为了研究直流磁场对MBN信号特性的影响，本文进行了理论分析和实验验证。发现直流磁场的强度和方向对MBN信号特性有很大影响，包括MBN信号的能量变化，MBN信号轮廓的峰值位置和形状。