A multi-frequency balanced electromagnetic field measurement for arbitrary angles of pipeline cracks with high sensitivity

Insight - Non-Destructive Testing and Condition Monitoring Pub Date : 2024-06-01 DOI:10.1784/insi.2024.66.6.361

Weilin Shao, Xiaohu Wu, Runkun Lu, Jinzhong Chen, Yilai Ma

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Abstract

Alternating current magnetic flux leakage (ACMFL) technology has been used for sizing pipeline cracks. However, traditional ACMFL methods are limited in sensitively identifying arbitrary angles of pipeline cracks due to the complexity of crack morphology. To solve the problem, a multi-frequency balanced electromagnetic field measurement (MF-BEFM) method is proposed. First, the distortion of the magnetic field and eddy current field caused by crack defects was studied. Then, the effects of the excitation frequency on balanced electromagnetic field measurement (BEFM) signals were considered to select optimal parameters. Next, the relationship between the BEFM signal and crack angle was studied. Finally, the MF-BEFM experiment was conducted to prove the superiority of the proposed method. The results show that the BEFM method cannot only overcome the deficiency of directional detection of ACMFL methods but it can also achieve high detection sensitivity for identifying arbitrary angles of cracks on the pipeline surface.

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高灵敏度管道裂缝任意角度多频平衡电磁场测量法

交流磁通量泄漏 (ACMFL) 技术已被用于确定管道裂缝的大小。然而，由于裂纹形态的复杂性，传统的 ACMFL 方法在灵敏识别管道裂纹的任意角度方面受到限制。为了解决这个问题，我们提出了一种多频平衡电磁场测量（MF-BEFM）方法。首先，研究了裂纹缺陷引起的磁场和涡流场畸变。然后，考虑了激励频率对平衡电磁场测量（BEFM）信号的影响，以选择最佳参数。接着，研究了 BEFM 信号与裂纹角度之间的关系。最后，进行了 MF-BEFM 试验，以证明所提方法的优越性。结果表明，BEFM 方法不仅克服了 ACMFL 方法在方向性检测方面的不足，而且在识别管道表面任意角度的裂缝方面也能达到很高的检测灵敏度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Insight - Non-Destructive Testing and Condition Monitoring

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