| 双传感器差分峰值侦测的漏磁检测新方法 |
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| 引用本文： | 吴德会,刘志天,苏令锌. 双传感器差分峰值侦测的漏磁检测新方法[J]. 仪器仪表学报, 2016, 37(6): 1218-1225 |
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| 作者姓名： | 吴德会 刘志天 苏令锌 |
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| 作者单位： | 厦门大学 航空航天学院机电工程系厦门361005,厦门大学 航空航天学院机电工程系厦门361005,厦门大学 航空航天学院机电工程系厦门361005 |
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| 基金项目： | 国家自然科学基金(51177141)、航空基金（2012ZD68003）项目资助 |
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| 摘 要： | 为了提高管道、储罐漏磁检测的准确度、灵敏度,同时抑制噪声干扰,提出了一种双传感器差分峰值侦测的漏磁检测新方法。首先,对实际漏磁检测过程存在的背景噪声进行分析,研究了检测器振动、磁隙变化、磁轭泄漏等噪声源的共模特性;其次,利用缺陷漏磁场的分布特点构造了一种新型的差分侦测结构,该结构既可对噪声进行共模抑制,又可实现缺陷特征信号的差模提取;再次,依托磁偶极子模型,对所提方法的机理进行了分析,并讨论实现该方法所需要的约束条件及其检测灵敏度特性;最后,开展了仿真和物理实验,实验结果表明,该方法的噪声仅为传统X分量检测的5%,Y分量检测的26%,且检测敏感度提高了2倍。该方法为优化漏磁检测器结构、提高检测的可靠性及灵敏性提供了一个新的思路。
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| 关 键 词： | 漏磁检测；差分峰值侦测；共模噪声；磁偶极子 |
New MFL detection method based on differential peak extraction using dual sensors |
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| Wu Dehui,Liu Zhitian and Su Lingxin. New MFL detection method based on differential peak extraction using dual sensors[J]. Chinese Journal of Scientific Instrument, 2016, 37(6): 1218-1225 |
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| Authors: | Wu Dehui Liu Zhitian Su Lingxin |
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| Affiliation: | Department of Electronic Mechanical Engineering, School of Aerospace Engineering, Xiamen University, Xiamen 361005, China,Department of Electronic Mechanical Engineering, School of Aerospace Engineering, Xiamen University, Xiamen 361005, China and Department of Electronic Mechanical Engineering, School of Aerospace Engineering, Xiamen University, Xiamen 361005, China |
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| Abstract: | In order to improve the accuracy and sensitivity of pipeline and storage tank magnetic flux leakage (MFL) detection, as well as suppress noise interference, a new MFL detection method based on differential peak extraction using dual sensors is proposed. Firstly, the background noise in actual MFL detection process is analyzed and the common mode characteristics of the noise sources, such as sensor vibration, magnet gap change, magnet yoke leakage and etc. are studied. Next, a new differential detection structure is built based on the distribution characteristics of the defect magnetic flux leakage, which can restrain the common mode noise and realize the differential extraction of the defect feature signal. Then, based on the magnetic dipole model the mechanism of the proposed method is analyzed, the restraint conditions required for realizing the new method and the detection sensitivity characteristic of the method are discussed. Finally, simulation and experiment study were conducted, and the results show that the noise with the new method is only 5% of the one with traditional X component detection, and 26% with traditional Y component detection. Moreover, the detection sensitivity is improved twice. The proposed method provides a new strategy for optimizing the MFL detection sensor structure, and improving the detection reliability and sensitivity. |
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| Keywords: | magnetic flux leakage detection differential peak extraction common mode noise magnetic dipole |
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