A model of cup-core probe for eddy current nondestructive evaluation

Author

Liebeaux, Nicolas ; Bihan, Yann Le ; Placko, Dominique

Author_Institution

Lab. d´´Electr., Signaux et Robotique, Cachan, France

Volume

3

fYear

2000

fDate

2000

Firstpage

1603

Abstract

Eddy current techniques are widely used for NDE of metallic objects. However, analytical solutions for eddy current problems are rather difficult to obtain. For some 2D plane geometries problems, where specific properties are assigned to layers of space and with an axisymmetric air coil excitation, partial differential equations solving by separation of variables is possible. The modeling of a realistic configuration, including a magnetic-core, gets significantly more complex, except for some particular cases. In this paper, we present an original solution based on flux ring excitation, allowing the analytical determination of the probe impedance. The studied geometry is a cup shaped ferrite core, with introduction of a conductive shielding, in order to reduce magnetic leakage and improve spatial resolution. The model is then validated by a finite element simulation

Keywords

eddy current testing; finite element analysis; magnetic cores; magnetic flux; magnetic shielding; conductive shielding; cup-core probe model; eddy current NDE; ferrite core; finite element simulation; flux ring excitation; magnetic flux density; magnetic scalar potential; probe impedance; reduced magnetic leakage; spatial resolution; Coils; Eddy currents; Geometry; Impedance; Magnetic analysis; Magnetic flux; Magnetic separation; Magnetic shielding; Partial differential equations; Probes;

fLanguage

English

Publisher

ieee

Conference_Titel

Instrumentation and Measurement Technology Conference, 2000. IMTC 2000. Proceedings of the 17th IEEE

Conference_Location

Baltimore, MD

ISSN

1091-5281

Print_ISBN

0-7803-5890-2

Type

conf

DOI

10.1109/IMTC.2000.848741

Filename

848741