Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1996-05-09
1999-12-14
Patidar, Jay
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324235, 324232, 324233, 324262, G01N 2782
Patent
active
060022515
ABSTRACT:
An electromagnetic-field-focusing remote-field eddy-current probe for inspecting anomalies in a conducting plate. The probe is designed to have the electromagnetic energy released from an excitation coil penetrate through the plate twice, so that the signals received by one or more receiver units (pickup coils, magneto-resistors or SQUIDs) have passed twice through the plate wall; from one side of the plate at the excitation coil to the other side, then back to the original side at the receiver units. The probe detects flaws, with good and substantially equal sensitivity, irrespective of their depth in the plate. It can detect, from one side of a plate, flaws located on the other side of the plate, which is useful for inspecting the bottom plate of a huge tank which is sitting on the ground. The thickness of inspected plates can go up to one inch for aluminum plates and to 3/8" for ferromagnetic plates. The probe generates a periodic magnetic field. The excitation coil and an auxiliary device direct the electromagnetic field into the plate being inspected. In one embodiment, the auxiliary device is a coil driven by a signal having a phase and amplitude relationship to the excitation coil's signal. The excitation and the receiver units are covered by one or more shields made of highly conducting materials, or of highly conducting materials laminated with alternating layers of ferromagnetic materials.
REFERENCES:
patent: 2573799 (1951-11-01), MacClean
patent: 4797614 (1989-01-01), Nelson
patent: 5264733 (1993-11-01), Tigges
patent: 5648721 (1997-07-01), Wincheski et al.
Y.S. Sun, et al., "Progress in Developing RFEC Probe for Tank Bottom Inspection", presented on ASNT's 1996 Spring Conference ASNT, Norfolk, VA, Mar. 19-21, 1996.
Y. S. Sun, et al., "Inspection of Metallic Plates Using A Novel Remote Field Eddy Current NDT Probe", Review of Progress in QNDE, vol. 15A, 1996, pp. 1137-1144.
Y. S. Sun, et al., "Efforts Towards Gaining a Better Understanding of The Remote Field Eddy Current Phenomenon and Expanding its Applications", IEEE Transaction on Magnetics, vol. 32, 1996, pp. 1589-1592.
Y. Sun, S. Udpa, W. Lord and D. Cooley, "A Remote Field Eddy Current NDT Probe for the Inspection of Metallic Plates", Topical Conference Paper Summaries Book--ASNT's International Chemical and Petroleum Industry Inspection Technology (ICPIIT) IV Topical Conference, 1995 and Materials Evaluation, vol. 54/No. 4, Apr. 1996(Appendix-09).
Y. S. Sun, et al., "Motion Induced Remote Field Eddy Current Effect in a Magnetostatic Non-destructive Testing Tool", IEEE Transaction on Magnetics, vol. 30, pp. 3304-3307, Sep. 1994.
Y. S. Sun, et., "Finite Element Modeling and Physics of Remote Field Eddy Current Responses for Axially Aligned Cracks", IEEE Transaction on Magnetics, vol. 28, pp. 1941-1947, Jul. 1992.
Y. S. Sun, et., "Improvement in Remote-Field Eddy Current Probe Structure", Materials Evaluation, vol. 50, pp. 600-604, May, 1992. (Appendix -12).
M. Chen, Y. Sun, et al., "Pulsed RFEC Response", IEEE Transaction on Magnetics, vol. 28, No. 2, pp. 1430-1433, Mar. 1992.
Y. S. Sun, at al., "Computer Animated Presentation Visualizing The Phenomena in Remote Field Eddy Current Nondestructive Test Technique", Electromagnetic Forces and Applications, edited by J. Tani and T. Takagi, pp. 203-206, Elsevier Science Publishers, 1992.
Y. S. Sun, at al., "Crack Modeling Problem in Eddy Current Nondestructive Testing", Electromagnetic Phenomena and Computation Techniques, edited by M. Enokizono and J. P. Nowaski, pp. 173-182, Elsevier.
M. J. Chen and Y. S. Sun, "A Finite Element Prediction of Possible Application of Pulse Excitation in Remote Field Eddy Current Nondestructive Inspection Devices", International Journal of Applied Electromagnetics in Materials, vol. 2, pp. 217-220, 1991.
Y. Sun, at al., "3-D Finite Element Modeling of the Remote Field Eddy current Effect", Review of Progress in QNDE, vol. 9A, pp. 319-326, 1990.
H. Y. Lin and Y. S. Sun, Application of "Zoom-In" Technique in 3D Remote Field Eddy.
Y. -S. Sun, "Finite Element Study of Diffusion Energy Flow in Low-Frequency Eddy Current Fields", Materials Evaluation, vol. 47, pp. 87-92, 1989.
W. Lord, Y. S. Sun, S. U. Udpa, "Physics of Remote Field Eddy Current Effect", Review of Progress in Quantitative Nondestructive Evaluation, vol. 7A, pp. 165-172, 1988.
W. Lord, Y. Sun, S. Udpa, "A Finite Element Study of the Remote Field Eddy Current Phenomenon", IEEE Transaction on Magnetics, vol. 24, pp. 435-438, Jan. 1988.
T.R. Schmidt, "The Remote Field Eddy Current Technique", Materials Evaluation, vol. 42, pp. 225-230, Feb. 1984.
D.A. Atherton, et al., "Finite-Element Calculation for Shields in Remote-Field Eddy Current Tools", Materials Evaluation, vol. 47, pp. 1084-1088, Sep. 1989.
E. von Rosen and David Atherton, "Effect of Shielding and Exciter Coil Tilt on the Remote-Field Effect", Materials Evaluation, vol. 51, pp. 66-71, Jan. 1993.
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