Pulsed Eddy Current Technology: Characterizing Material Loss with Gap and Lift-off Variations

Giguère, Sylvain; Lepine, B. A.; Dubois, J. M. S.

doi:10.1080/09349840109409692

Cited by 84 publications

(19 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, the lift-off of the electromagnetic sensor has been found can significantly affect the measured signal, which could further influence the accuracy of inspecting the surface crack and measuring the property (e.g. electrical conductivity, magnetic permeability, and thickness) of materials [18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…Tian and Sophian have used normalisation and two reference signals to reducing the lift-off effect on PEC testing [20]. Giguère et al have extracted the lift-off point of intersection (LOI) feature from the PEC signals [21]. Wang et al, Angani et al, and Wen et al have used the LOI feature to measure the thickness of coatings and ferromagnetic applications [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Measuring Lift-off Distance and Electromagnetic Property of Metal Using Dual-Frequency Linearity Feature

Lü¹,

Meng²,

Huang³

et al. 2020

Preprint

View full text Add to dashboard Cite

Lift-offs of the sensor could significantly affect the measurement signal and reconstruction of material properties when using the electromagnetic (inductive) eddy current sensor. Previously, various methods (including novel sensor designs, and features like zero-crossing frequency, lift-off point of intercept) have been used for eliminating the measurement error caused by the lift-off distance effect of the sensor. However, these approaches can only be applied for a small range of lift-off variations. In this paper, a linear relationship has been found between the sensor lift-off and ratio of dual-frequency eddy current signals, particularly under the high working dual frequencies. Based on this linear relationship, the lift-off variation can be reconstructed firstly with a small error of 2.5 % when its actual value is up to 10 mm (10.1 % for 20 mm). The reconstructed lift-off is used to further get the property of the material under a low single frequency. Experiments on different ferrous metals have been carried out for the testing of the reconstruction scheme. Since the inductance is more sensitive to the material property (and less sensitive to the lift-off) under low frequencies, the reconstruction error of the material property is much smaller than that of the lift-off, with 1.4 % under 12 mm (and 4.5 % under 20 mm).

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Measuring Lift-off Distance and Electromagnetic Property of Metal Using Dual-Frequency Linearity Feature

Lü¹,

Meng²,

Huang³

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…Pulsed eddy current (PEC) testing is a nondestructive and effective electromagnetic inspection technique [1][2][3][4][5][6][7]. PEC testing exhibits many advantages over conventional nondestructive testing (NDT).…”

Section: Introductionmentioning

confidence: 99%

Shape Mapping Detection of Electric Vehicle Alloy Defects Based on Pulsed Eddy Current Rectangular Sensors

Zhang

Dong

et al. 2018

Applied Sciences

View full text Add to dashboard Cite

In this paper, we investigate pulsed eddy current (PEC) testing based on a rectangular sensor for the purpose of defect shape mapping in electric vehicle lightweight alloy material. Different dimensional defects were machined on the 3003 aluminum alloy and detected using the A-scan technique and C-scan imaging in two scanning directions. The experiment results indicated that defect plane shape could be preliminarily obtained and length and width could be estimated based upon C-scan contour images. Consequently, the comparison of results between the two directions showed that the C-scan identification in the direction of magnetic flux was better than in the direction of the exciting current. Finally, subsurface defects and irregular defects were detected to verify the performance of shape mapping as a recommended approach. The conclusion drawn indicates that the proposed method, based on PEC rectangular sensors, is an effective approach in reconstructing a defect’s shape.

show abstract

“…6 Giguère et al detected metal loss with voltage amplitude of lift-off point of intersection (LOI). 7 Morozov et al measured the stress of aluminium alloys with peak height. 8 He et al detected defects in riveted structures of aging aircraft by peak height and zero-crossing time, 9 and classified surface and subsurface defects using rising time, time to peak, and crossing time.…”

Section: Introductionmentioning

confidence: 99%

Frequency feature based quantification of defect depth and thickness

Tian

Chen

Bai

et al. 2014

Review of Scientific Instruments

View full text Add to dashboard Cite

This study develops a frequency feature based pulsed eddy current method. A frequency feature, termed frequency to zero, is proposed for subsurface defects and metal loss quantification in metallic specimens. A curve fitting method is also employed to generate extra frequency components and improve the accuracy of the proposed method. Experimental validation is carried out. Conclusions and further work are derived on the basis of the studies.

show abstract

Pulsed Eddy Current Technology: Characterizing Material Loss with Gap and Lift-off Variations

Cited by 84 publications

References 1 publication

Measuring Lift-off Distance and Electromagnetic Property of Metal Using Dual-Frequency Linearity Feature

Measuring Lift-off Distance and Electromagnetic Property of Metal Using Dual-Frequency Linearity Feature

Shape Mapping Detection of Electric Vehicle Alloy Defects Based on Pulsed Eddy Current Rectangular Sensors

Frequency feature based quantification of defect depth and thickness

Contact Info

Product

Resources

About