Pulse distortion due to eddy currents induced in a multiply excited cylindrical shell of finite length and thickness

Author

Chrissoulidis, D.P. ; Sergiadis, G.D. ; Tsiboukis, T.D. ; Kriezis, E.E.

Author_Institution

Dept. of Electr. Eng., Aristotle Univ. of Thessaloniki, Greece

Volume

25

Issue

6

fYear

1989

fDate

11/1/1989 12:00:00 AM

Firstpage

4454

Lastpage

4461

Abstract

The electromagnetic field due to pulse excitation of two crossed pairs of coils surrounded by a cylindrical conducting shell is determined by accounting for the eddy-current effect. Each coil is modeled as a pair of straight, parallel wires of infinite length; the surrounding conducting shell is a cylindrical tube of finite length and thickness. The problem is formulated in the frequency domain, and the resulting expressions are used to calculate the transient magnetic flux density which originates from the quadruple coil and the eddy currents induced within the metallic shell. The part due to the eddy currents represents an unwanted distortion, which is investigated through a numerical example. The analytical and numerical results are complemented by a brief discussion on compensation techniques and potential applications in magnetic resonance imaging

Keywords

eddy currents; electromagnetic field theory; magnetic flux; nuclear magnetic resonance spectroscopy; solenoids; analytical calculation; compensation techniques; cylindrical conducting shell; eddy-current effect; electromagnetic field; frequency domain; magnetic resonance imaging; multiply excited cylindrical shell; numerical results; pulse excitation; quadruple coil; transient magnetic flux density; Coils; EMP radiation effects; Eddy currents; Electromagnetic fields; Frequency domain analysis; Image analysis; Magnetic analysis; Magnetic flux density; Magnetic resonance imaging; Wires;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.45326

Filename

45326