Research on the magnetic flux leakage field distribution characteristics of defect in low-frequency electromagnetic detection technique

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  • Yang Lijian
    School of Information Science and Engineering, ShenyangUniversity of Technology
  • Huang Ping
    School of Information Science and Engineering, ShenyangUniversity of Technology
  • Gao Songwei
    School of Information Science and Engineering, ShenyangUniversity of Technology
  • Du Zhouzhong
    School of Computer and Communication Engineering, Zhengzhou University of Light Industry
  • Bai Shi
    School of Information Science and Engineering, ShenyangUniversity of Technology

抄録

<p>This work aimed to investigate the distribution characteristics of the low-frequency magnetic flux leakage (LF-MFL) field of defect on oil and gas pipelines in low-frequency electromagnetic detection technique (LFET). Taking four types of crack defects (rectangular, semicircular, trapezoidal, and V-shaped grooves) with equal lengths, widths and different bottom shapes into consideration, the specific mathematical model of the LF-MFL field was inferred and established on the basis of magnetic dipole theory. Experimental results demonstrated that the variation values of the tangential and normal component upper-lower envelope difference curves were linearly positively correlated with the defect cross-sectional area along the detection direction, which was strictly independent of bottom shape and excitation conditions (amplitude, frequency and lift-off).</p>

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  • IEICE Electronics Express

    IEICE Electronics Express 18 (1), 20200362-20200362, 2021-01-10

    一般社団法人 電子情報通信学会

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