Prediction of eddy current probe signal trajectories

Palanisamy, R.; Lord, W.

doi:10.1109/tmag.1980.1060813

Cited by 42 publications

(14 citation statements)

References 3 publications

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“…The integral equations were coded in FORTRAN-77 and results are given in this paper for an air-cored coil over a conducting slab. The solution for the vector potential was also effected via a weIl known 3D-axisymmetric finite element method (FEM) [2] which uses an energy functional minimization process. The FEM has the advantage that arbitrary axisymmetric defects or inhomogeneties can be introduced in the conducting media without added complexity, therefore, the FEM is ideal for field/defect interaction studies.…”

Section: Numerical Modelingmentioning

confidence: 99%

Skin Depth Considerations in Eddy Current NDT

Stucky

Lord

1992

Review of Progress in Quantitative Nondestructive Evaluation

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Eddy current nondestructive testing depends upon the interaction of time-varying electromagnetic fields with the material under test. The electromagnetic fields are applied to the material under test via some finite sized transducer, usuaIly an inductive coil or set of coils. If the material is conducting the fields will penetrate the conductor, but will attenuate to negligible levels after some distance. The classical skin depth, The objectives of the study were to compare the classical skin effect (exponential decay and linear phase delay) to computed (integral solution, FEM) eddy current density distributions in conductors, to determine a "region of validity" for the classical skin effect, and to confirm the validity of the computed results by comparison to experiment.

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Section: Numerical Modelingmentioning

confidence: 99%

Skin Depth Considerations in Eddy Current NDT

Stucky

Lord

1992

Review of Progress in Quantitative Nondestructive Evaluation

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“…The partial differential equation governing RFEC phenomena is based on the principle of electromagnetic induction described by the Maxwell-Ampere law, ~H·dl=JJ:[l+~~~-ds (1) and the Maxwell-Faraday law,…”

Section: Finite Element Formulationmentioning

confidence: 99%

“…lc) which are indicative of the tubes condition. From a numerical simulation or modeling point of view, the finite element (FE) prediction of such impedance plane trajectories [1][2][3] requires a geometry of the dimensions shown in Fig. le.…”

Section: Introductionmentioning

confidence: 99%

3-D Finite Element Modeling of the Remote Field Eddy Current Effect

Sun

Shin

et al. 1990

Review of Progress in Quantitative Nondestructive Evaluation

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“…H (51, 52, zn) = Ho (51, 52) exp (--zn) 8 (1) The physical meaning of the surface impedance condition is to replace, as in [6], the eddy currents in the metal by a surface current density js, given by a8 ...…”

Section: The Surface Impedance Boundary Conditionmentioning

confidence: 99%

“…Those mode1s solve Maxwe11's equations and compute the coi1 impedance. Many 2-D programs have been realized: -for axisymmetrica1 geometries, with axisymmetrica1 or very sma11 f1aws, to model tube sheets of a steam generator or wires [1,2].…”

mentioning

confidence: 99%