Remote Field Eddy Current Effect Research Articles

Motion induced remote field eddy current effect in a magnetostatic non-destructive testing tool: a finite element prediction

A hitherto unobserved phenomenon motion induced remote field eddy current effect, is presented in this paper. A numerical study of the non-destructive inspection of tubing with conducting walls, using a DC electromagnetic probe led to the detection of this interesting effect. This paper describes a bi-directional transmission of the electromagnetic field energy through the tube walls, similar to the phenomenon responsible for the Remote Field Eddy Current (RFEC) effect in eddy current (an AC electromagnetic nondestructive testing tool) inspection of tubing. Thus far it was considered that the RFEC effect by the nature of its physics was possible only in the presence of AC excitation in tubular geometries. However, it is shown in this paper that currents induced by magnetic flux moving over conducting material produce a RFEC effect even when a DC probe is used. This phenomenon may enable extraction of valuable information regarding the entire thickness of the tube wall from measurements made on the same side as the excitation source. >

The effect of an external tube on the remote field eddy current effect British journal of nondestructive testing, Vol. 31, No. 10, pp. 547–550 (Oct. 1989)

The effect of an external tube on the remote field eddy current effect British journal of nondestructive testing, Vol. 31, No. 10, pp. 547–550 (Oct. 1989)

A description of the remote field eddy current effect in metallic tubes Dissertation abstracts international, Vol. 50, No. 2, p. 609 (Aug. 1989)

A description of the remote field eddy current effect in metallic tubes Dissertation abstracts international, Vol. 50, No. 2, p. 609 (Aug. 1989)

Theoretical and experimental studies on the remote field eddy current effect : Review of progress in quantitative nondestructive evaluation, Vol. 8A. Edited by D.C. Thompson and D.E. Chimenti, pp. 267–274. Plenum Press (1989), ISBN 0 306 43209 9

Theoretical and experimental studies on the remote field eddy current effect : Review of progress in quantitative nondestructive evaluation, Vol. 8A. Edited by D.C. Thompson and D.E. Chimenti, pp. 267–274. Plenum Press (1989), ISBN 0 306 43209 9

A description of the remote field eddy current effect in metallic tubes : Dissertation abstracts international, Vol. 50, No. 2, p. 609 (Aug. 1989)

A description of the remote field eddy current effect in metallic tubes : Dissertation abstracts international, Vol. 50, No. 2, p. 609 (Aug. 1989)

The effect of an external tube on the remote field eddy current effect : British journal of nondestructive testing, Vol. 31, No. 10, pp. 547–550 (Oct. 1989)

The effect of an external tube on the remote field eddy current effect : British journal of nondestructive testing, Vol. 31, No. 10, pp. 547–550 (Oct. 1989)

Analysis of the remote-field eddy current effect in nonmagnetic tubes Materials evaluation, Vol. 47, No. 1, pp. 80–86 (Jan. 1989)

Analysis of the remote-field eddy current effect in nonmagnetic tubes Materials evaluation, Vol. 47, No. 1, pp. 80–86 (Jan. 1989)

Application of 'zoom-in' technique in 3D remote field eddy current effect computation

A novel application of the zoom-in technique for 3-D electromagnetic field calculation to 3-D remote field eddy current effect computation is introduced. The technique is especially suitable for problems that are essentially two-dimensional but with some local 3-D character. Significant reduction of computer resources is achieved by using this technique, since only a small portion of the whole calculation region, basically the 'three-dimensional part' of the problem, is under consideration. Some data from the solution of the corresponding two-dimensional or axisymmetrical problem are used as the boundary condition of the 3-D problem in computation. The validity of the method has been verified by a comparison of its results with those from an axisymmetric problem.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Finite Element Modeling of Remote-Field Eddy Current Problems for the Nondestructive Testing of Metal Tube

Abstract The remote-field eddy current effect refers to a low frequency eddy current nondestructive testing (NDT) phenomenon in tubular conductors (magnetic or nonmagnetic) in which the behavior of both amplitude and phase of induced magnetic field are in apparent contradiction to the conventional eddy current theory. Equal detection sensitivity across the wall thickness, linear relationship between the output signal phase-lag and the wall thickness, and absence of the lift-off problem are some of the attractive and contradicting features of this technique. Despite its early recognition and useful application in down-hole inspection of oil-well casing, no development of adequate scientific base that could explain this phenomenon has been reported. This paper describes modeling of this phenomenon using the finite element numerical analysis technique. Amplitude and phase of the sensor coil output have been predicted using this model for different axisymmetric test geometries, material properties, and excitation frequencies.