A simulation of magneto-optical eddy current imaging

Le, Minhhuy; Lee, Jinyi; Shoji, Tetsuo

doi:10.1016/j.ndteint.2011.07.013

Cited by 29 publications

(14 citation statements)

References 10 publications

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“…When an eddy current flow approaches a crack, it will circulate around the tips and the bottom of the crack [19]. In the DMM, the magnetic charge dipoles are assumed to occur along the path of the eddy current flows, which means that they occur on the surface and walls of the crack.…”

Section: Principles Of Dmm With Different Crack Shapesmentioning

confidence: 99%

“…4(a) shows the dipole model of the rectangular crack (w c Â l c Â d c ), the coordinate system and the distribution of the magnetic charge factor. The magnetic charge factor is uniform on the two crack tips, and varies linearly along the two crack walls at distance d c from the tips [19]. The RMS magnetic charge at point ðy 0 ,z 0 Þ on these surfaces can be calculated by Eq.…”

Section: Principles Of Dmm With Different Crack Shapesmentioning

confidence: 99%

“…However, these methods employ complex equations that lead to long simulation times. We have proposed a dipole model method (DMM) to simulate an alternating magnetic field based on MOI [19]. This method uses simple equations that enable rapid calculations.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hall sensor array based validation of estimation of crack size in metals using magnetic dipole models

Lee

Jun

et al. 2013

NDT & E International

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Section: Principles Of Dmm With Different Crack Shapesmentioning

confidence: 99%

Section: Principles Of Dmm With Different Crack Shapesmentioning

confidence: 99%

See 1 more Smart Citation

Hall sensor array based validation of estimation of crack size in metals using magnetic dipole models

Lee

Jun

et al. 2013

NDT & E International

Self Cite

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“…These techniques include the eddy current technique [9,10], the AC field measurement (ACFM) method [11], the magnetostrictive sensor technique [12], the non-contact AC potential drop method using a high impedance electric potential sensor [13], the magnetic flux leakage method [14], etc. In recent years, there have been several notable advances in the above mentioned NDE technique stemming from research to detect corrosion and other types of defects in metallic components, such as the pulsed eddy current approach [15][16][17][18], the magneto-optical imaging of eddy current [19], the transient-pulsed thermography technique [20], the eddy current induced thermography [21,22], etc.…”

Section: Introductionmentioning

confidence: 99%

Detecting surface features on conducting specimens through an insulation layer using a capacitive imaging technique

Yin

Hutchins

Chen

2012

NDT & E International

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“…The combination of the EC method with MO set-ups has been proven relevant for rapid imaging purposes in various NDT applications [35][36][37]. Indeed, these devices provide real time images of detected flaws in the inspected media.…”

Section: Eddy Current Imaging Device and Experimental Setupmentioning

confidence: 99%

A Differential DPSM Based Modeling Applied to Eddy Current Imaging Problems

Boré¹,

Joubert²,

Placko³

2014

PIER

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Abstract-This paper deals with an innovative implementation of a semi-analytical modeling method, called the Distributed Points Source Method (DPSM), in the case of an eddy current problem. The DPSM has already shown great potentialities for the versatile and computationally efficient modeling of complex electrostatic, electromagnetic or ultrasonic problems. In this paper, we report a new implementation of the DPSM, called differential DPSM, which shows interesting prospects for the modeling of complex eddy current problems such as met in the non-destructive imaging of metallic parts. In this paper, the used eddy current imaging device is firstly presented. It is composed of an eddy current (EC) inducer and a magneto optical set-up used to translate the magnetic field distribution appearing at the surface of the imaged part, into a recordable optical image. In this study, the device is implemented for the time-harmonics (900 Hz) imaging of a two-layer aluminum based assembly, featuring surfacebreaking and buried defects. Then, the basics of the time-harmonics DPSM modeling are recalled, and the differential approach is presented. It is implemented for the modeling of the interactions of the eddy current imaging device with the considered flawed assembly in the same operating conditions as the experimental implementation. The comparison between experimental and computed data obtained for millimetric surface and buried defects is presented in the form of complex magnetic cartographies and Lissajous plots. The obtained results show good agreement and open the way to the modeling of complex EC problems. Furthermore, the low computational complexity of the differential DPSM modeling makes it promising for solving EC inverse problems.

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A simulation of magneto-optical eddy current imaging

Cited by 29 publications

References 10 publications

Hall sensor array based validation of estimation of crack size in metals using magnetic dipole models

Hall sensor array based validation of estimation of crack size in metals using magnetic dipole models

Detecting surface features on conducting specimens through an insulation layer using a capacitive imaging technique

A Differential DPSM Based Modeling Applied to Eddy Current Imaging Problems

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