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Proceedings of E'NDE '96, October 28-29 (1996) Tokyo, Japan (submitted)

Eddy current testing with fluxset probe

J. Pávó(1), Antal Gasparics(1), Imre Sebestyén(1), Gábor Vértesy(2), Csaba S. Daróczi(2) and Kenzo Miya(3)

(1) Dept. Electrmagnetic Theory, Technical University of Budapest, H-1521 Budapest, Egry J. u. 18., Hungary
(2) HAS, Research Institute for Materials Science, H-1525 Budapest, P.O. Box 49, Hungary
(3) Nuclear Engineering Research Lab., University of Tokyo, Tokai-mura, Naka-gun, Ibaraki, 319-11, Japan

In this paper a novel type of eddy current testing (ECT) probe design is presented. The probe consists of two exciting coils used for the induction of eddy current in the tested specimen and a fluxset sensor measuring the perturbation of the magnetic field due to the presence of inhomogeneity in the tested material. The operational principle of the fluxset sensor is discussed highlighting its capabilities for the measurement of DC, AC and time-dependent magnetic fields. Beyond the high sensitivity, the advantage of the application of fluxset sensor for ECT measurements is the fact that, until a certain upper frequency limit, its sensitivity is almost independent of the frequency of the measured field, consequently it can be used for measurements where high penetration depth is required for the test of the specimen. Experimental data taken by the fluxset probe on a cracked stainless steel plate is presented. An optomisation method is also discussed that can be used for the enhancement of the sensitivity of the fluxset sensor by varying the shape of the ferromagnetic core of the sensor. The optimisation is demonstrated by a numerical example.

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