Measurement of Electromagnetic Parameters of Metal-Coating Thickness Measures

Syaskо, V. А.; Голубев, С. С.; Smorodinskii, Ya. G.; Potapov, A. I.; Solomenchuk, P. V.; Смирнова, Н. И.

doi:10.1134/s1061830918100091

Cited by 15 publications

(5 citation statements)

References 1 publication

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“…Fig. 6 shows the error of retrieved lift-off from the measured high-frequency inductance using proposed algorithms (18) and (19). It can be observed that the error of inversed lift-off slightly increases with the actual spacing distance between the sensor and test piece.…”

Section: Methodsmentioning

confidence: 99%

“…Considering the ferrous substrate, Yang and Tai have used the swept-frequency eddy-current (SFEC) for the determination of the substrate permeability, which serve as the input for subsequent measurements of conductivity and thickness of coatings using the pulsed eddy current (PEC) method [7][8][9][10][11]. Other methods including the dual-frequency EC sensing technique [12], swept-frequency [13][14][15] and single-frequency [16] eddy current sensing for the thickness measurement of non-metallic coatings, error compensations on the thickness of conductive coatings [17], reconstruction of multilayer electromagnetic parameters [18,19], numerical models [20], and alternative strategies on monitoring the coatings [21]. The proposed techniques can cope with small lift-off variations of up to 6 mm for either magnetic or non-magnetic materials.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Coating Thickness Using Lift-Off Insensitivity of Eddy Current Sensor

Meng

Lü

Yin

et al. 2021

Preprint

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Defect detection in ferromagnetic substrates is often hampered by non-magnetic coating thickness variation when using conventional eddy current testing technique. The lift-off distance between the sample and the sensor is one of the main obstacles for the thickness measurement of non-magnetic coatings on ferromagnetic substrates when using the eddy current testing technique. Based on the eddy current thin-skin effect and the lift-off insensitive inductance (LII), a simplified iterative algorithm is proposed for reducing the lift-off variation effect using a multi-frequency sensor. Compared to the previous techniques on compensating the lift-off error (e.g., the lift-off point of intersection) while retrieving the thickness, the simplified inductance algorithms avoid the computation burden of integration, which are used as embedded algorithms for the online retrieval of lift-offs via each frequency channel. The LII is determined by the dimension and geometry of the sensor, thus eliminating the need for empirical calibration. The method is validated by means of experimental measurements of the inductance of coatings with different materials and thicknesses on ferrous substrates (dual-phase alloy). The error of the calculated coating thickness has been controlled to within 3 % for an extended lift-off range of up to 10 mm.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of Coating Thickness Using Lift-Off Insensitivity of Eddy Current Sensor

Meng

Lü

Yin

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…(a) (b) Figure 6 shows the error of retrieved lift-off from the measured high-frequency inductance using proposed algorithms (18) and (19). It can be observed that the error of inversed lift-off slightly increases with the actual spacing distance between the sensor and test piece.…”

Section: Retrieval Of Lift-off Distancementioning

confidence: 99%

“…For coatings of different materials and thickness, the error of inversed lift-off has been controlled within 0.2 mm for different coatings thicknesses. Figure 6 shows the error of retrieved lift-off from the measured high-frequency inductance using proposed algorithms (18) and (19). It can be observed that the error of inversed lift-off slightly increases with the actual spacing distance between the sensor and test piece.…”

Section: Retrieval Of Lift-off Distancementioning

confidence: 99%

“…Considering the ferrous substrate, Yang and Tai have used the swept-frequency eddy-current (SFEC) for the determination of the substrate permeability, which serve as the input for subsequent measurements of conductivity and thickness of coatings using the pulsed eddy current (PEC) method [ 7 , 8 , 9 , 10 , 11 ]. Other methods include the dual-frequency EC sensing technique [ 12 ], swept-frequency [ 13 , 14 , 15 ] and single-frequency [ 16 ] eddy current sensing for the thickness measurement of nonmetallic coatings, error compensations on the thickness of conductive coatings [ 17 ], reconstruction of multilayer electromagnetic parameters [ 18 , 19 ], numerical models [ 20 ], and alternative strategies on monitoring the coatings [ 21 ]. The proposed techniques can cope with small lift-off variations of up to 6 mm for either magnetic or nonmagnetic materials.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of Coating Thickness Using Lift-Off Insensitivity of Eddy Current Sensor

Meng

Lü

Yin

et al. 2021

Sensors

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Defect detection in ferromagnetic substrates is often hampered by nonmagnetic coating thickness variation when using conventional eddy current testing technique. The lift-off distance between the sample and the sensor is one of the main obstacles for the thickness measurement of nonmagnetic coatings on ferromagnetic substrates when using the eddy current testing technique. Based on the eddy current thin-skin effect and the lift-off insensitive inductance (LII), a simplified iterative algorithm is proposed for reducing the lift-off variation effect using a multifrequency sensor. Compared to the previous techniques on compensating the lift-off error (e.g., the lift-off point of intersection) while retrieving the thickness, the simplified inductance algorithms avoid the computation burden of integration, which are used as embedded algorithms for the online retrieval of lift-offs via each frequency channel. The LII is determined by the dimension and geometry of the sensor, thus eliminating the need for empirical calibration. The method is validated by means of experimental measurements of the inductance of coatings with different materials and thicknesses on ferrous substrates (dual-phase alloy). The error of the calculated coating thickness has been controlled to within 3% for an extended lift-off range of up to 10 mm.

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Features of Signal Processing in the Study of Defects in Metallic Mediums Using an Electromagnetic Acoustic Wave

Mozhayko

Manninen

2020

Springer Proceedings in Physics

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Measurement of Electromagnetic Parameters of Metal-Coating Thickness Measures

Cited by 15 publications

References 1 publication

Evaluation of Coating Thickness Using Lift-Off Insensitivity of Eddy Current Sensor

Evaluation of Coating Thickness Using Lift-Off Insensitivity of Eddy Current Sensor

Evaluation of Coating Thickness Using Lift-Off Insensitivity of Eddy Current Sensor

Features of Signal Processing in the Study of Defects in Metallic Mediums Using an Electromagnetic Acoustic Wave

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