The reduced impedance function for cup-core eddy-current probes

Author

Bowler, John R. ; Sabbagh, Harold A. ; Sabbagh, L. David

Author_Institution

Sabbagh Associates Inc., Bloomington, IN, USA

Volume

25

Issue

3

fYear

1989

fDate

5/1/1989 12:00:00 AM

Firstpage

2646

Lastpage

2649

Abstract

Eddy-current nondestructive evaluation makes use of ferrite-core probes for exciting alternating currents in the test piece. The effectiveness of the probe for detecting flaws in the material through changes in its impedance may be assessed from its interaction with an unflawed conductor. For an important class of eddy-current probes, those with ferrite cup-cores, the measured impedance characteristics are governed by a rule-based behavior found from experiments. These findings are in conflict with the elementary circuit theory model of probe-workpiece interaction but are confirmed by a general field-theory probe model

Keywords

eddy current testing; ferrite devices; probes; transducers; cup-core eddy-current probes; detecting flaws; eddy current NDT; exciting alternating currents; ferrite cup-cores; ferrite-core probes; general field-theory probe model; measured impedance characteristics; probe-workpiece interaction; reduced impedance function; rule-based behavior; Circuit theory; Conducting materials; Eddy current testing; Ferrites; Frequency; Impedance measurement; Inspection; Nondestructive testing; Probes; Surface impedance;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.24504

Filename

24504