Affiliations: [a] School of Manufacturing Science and Engineering, Sichuan University, Chengdu, Sichuan, China | [b] School of Mechanical Science & Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, China
Correspondence:
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Corresponding author: Fang Hui, School of Manufacturing Science and Engineering, Sichuan University, Chengdu, China. Tel.: +86 13551233880; E-mail:[email protected]
Abstract: To improve the accuracy of the magnetic flux leakage
(MFL) testing in practical application, we analyzed the signal
characteristics of rectangular induction coil affected by the sensor
arrangement and scanning direction. On the basis of magnetic dipole theory,
the descriptions for the MFL field distributions of standard discontinuity
were established. Further, based on Faraday's law of induction, the signal
characteristics of rectangular induction coils were calculated and it was
found that the signal waveform of the horizontal coil is similar with the
x component of MFL; in contrast, the signal waveform of the vertical one has
the same changing trend with the z component of MFL. Finally, the influence
of scanning direction was analyzed and found that different scanning
directions will generate different signal characteristics; and that with the
angle β between the coil and discontinuity orientation changing from 0 to
π/2, the signal amplitudes of both induction coils decrease, which was
verified by relevant experiments.
Keywords: MFL (magnetic flux leakage), induction coil, output signal characteristic, arrangement direction, scanning direction