Measurement of Ferromagnetic Slabs Permeability Based on a Novel Planar Triple-Coil Sensor

Eddy current methods are wildly used for measuringthe electromagnetic property of ferromagneticsamples due to its high sensitivities and portability (when using the remote electromagnetic sensor). However, in diverse applications, the eddy current measurement is always hampered by the lift-off variation – the gap between the sensing probe and the sample. In this paper, the measurement error of the permeability caused by the lift-off variation could be significantly reduced when using a developed planar triple-coil sensor. An inverse algorithm, the single-frequency eddy current algorithm is established for the evaluation of the permeability by referring to the phase of themeasured impedance or inductance. Based on the experiments of several ferromagnetic samples when using the developed sensor and inverse algorithm, the measured permeability is proved can be almost immune to the lift-off variations.

[1]  Wuliang Yin,et al.  Exploring the relationship between ferrite fraction and morphology and the electromagnetic properties of steel , 2007 .

[2]  Sylvain Giguere,et al.  Pulsed eddy current: Finding corrosion independently of transducer lift-off , 2000 .

[3]  Thomas W. Krause,et al.  Simultaneous Multiparameter Measurement in Pulsed Eddy Current Steam Generator Data Using Artificial Neural Networks , 2016, IEEE Transactions on Instrumentation and Measurement.

[4]  Xuan Zeng,et al.  Hidden defect recognition based on the improved ensemble empirical decomposition method and pulsed eddy current testing , 2017 .

[5]  H. Yang,et al.  Determining the magnetic permeability of ferrite steel strip by a custom inversion method , 2018 .

[6]  M. Strangwood,et al.  Measurement of Permeability and Ferrite/austenite Phase Fraction Using a Multi-frequency Electromagnetic Sensor , 2007, 2007 IEEE Instrumentation & Measurement Technology Conference IMTC 2007.

[7]  Yong Tian.  Electrical conductivity and magnetic permeability measurement of case hardened steels , 2015 .

[8]  Qian Zhao,et al.  Three-dimensional electromagnetic mixing models for dual-phase steel microstructures , 2018 .

[9]  Shejuan Xie,et al.  Quantitative non-destructive evaluation of wall thinning defect in double-layer pipe of nuclear power plants using pulsed ECT method , 2015 .

[10]  Wuliang Yin,et al.  A Novel Compensation Algorithm for Thickness Measurement Immune to Lift-Off Variations Using Eddy Current Method , 2016, IEEE Transactions on Instrumentation and Measurement.

[11]  R. J. Ditchburn,et al.  Mutual Impedance of Planar Eddy-Current Driver–pickup Spiral Coils , 2008 .

[12]  Catalin Mandache,et al.  Transient and harmonic eddy currents: Lift-off point of intersection , 2006 .

[13]  Wuliang Yin,et al.  A Novel Dual Modality Sensor With Sensitivities to Permittivity, Conductivity, and Permeability , 2019, IEEE Sensors Journal.

[14]  Wuliang Yin,et al.  An Equivalent-Effect Phenomenon in Eddy Current Non-Destructive Testing of Thin Structures , 2019, IEEE Access.

[15]  Wuliang Yin,et al.  Reducing the Lift-Off Effect on Permeability Measurement for Magnetic Plates From Multifrequency Induction Data , 2018, IEEE Transactions on Instrumentation and Measurement.

[16]  Toshiyuki Takagi,et al.  Influence of Plastic Deformation and Fatigue Damage on Electromagnetic Properties of 304 Austenitic Stainless Steel , 2018, IEEE Transactions on Magnetics.

[17]  Mengbao Fan,et al.  Extraction of LOI Features From Spectral Pulsed Eddy Current Signals for Evaluation of Ferromagnetic Samples , 2019, IEEE Sensors Journal.

[18]  Qian Zhao,et al.  Measurement of Permeability for Ferrous Metallic Plates Using a Novel Lift-Off Compensation Technique on Phase Signature , 2019, IEEE Sensors Journal.

[19]  Wuliang Yin,et al.  Determination of the Magnetic Permeability, Electrical Conductivity, and Thickness of Ferrite Metallic Plates Using a Multifrequency Electromagnetic Sensing System , 2019, IEEE Transactions on Industrial Informatics.

[20]  Qian Zhao,et al.  Conductivity Lift-off Invariance and measurement of permeability for ferrite metallic plates , 2018 .

[21]  Chen Guoming,et al.  Analysis of the lift-off effect of a U-shaped ACFM system , 2013 .

[22]  Wei Li,et al.  Noncontact Thickness Measurement of Metal Films Using Eddy-Current Sensors Immune to Distance Variation , 2015, IEEE Transactions on Instrumentation and Measurement.

[23]  W. Chew.  Waves and Fields in Inhomogeneous Media , 1990 .