A theoretical and computational model of eddy-current probes incorporating volume integral and conjugate gradient methods

Author

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

Author_Institution

Sabbagh Associates, Bloomington, IN, USA

Volume

25

Issue

3

fYear

1989

fDate

5/1/1989 12:00:00 AM

Firstpage

2650

Lastpage

2664

Abstract

A general three-dimensional computational model of ferrite-core eddy-current probes has been developed for research and design studies in nondestructive evaluation. The model is based on a volume integral approach for finding the magnetization of the ferrite core excited by an AC-current-carrying coil in the presence of a conducting workpiece. Using the moment method, the integral equation is approximated by a matrix equation and solved using conjugate gradient techniques. Illustrative results are presented showing the impedance characteristics and field distributions for practical eddy-current probe configurations

Keywords

eddy current testing; ferrite devices; probes; transducers; AC-current-carrying coil; computational model; conducting workpiece; conjugate gradient methods; conjugate gradient techniques; eddy-current probes; ferrite-core eddy-current probes; field distributions; general three-dimensional computational model; impedance characteristics; integral equation; magnetization; matrix equation; moment method; nondestructive evaluation; practical eddy-current probe configurations; research and design studies; volume integral; Coils; Computational modeling; Ferrites; Gradient methods; Impedance; Integral equations; Magnetic cores; Magnetization; Probes; Transmission line matrix methods;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.24505

Filename

24505