DocumentCode :
2092848
Title :
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
Link To Document :
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