A time domain method for determining the relaxation time spectra

Author

García-Gracia, M. ; Letosa, J. ; Artacho, J.M. ; Forniés-Marquina, J.M.

Author_Institution

Dept. de Ingenieria Electr., Electron. y Communicaciones, Zaragoza Univ., Spain

Volume

33

Issue

2

fYear

1997

fDate

3/1/1997 12:00:00 AM

Firstpage

1464

Lastpage

1467

Abstract

Many electromagnetic field problems can be expressed as a Fredholm integral equation of the first kind or the second kind. The step response of many linear physical systems may be analysed as sums of decaying exponentials. The paper describes a procedure (which improves the performance of gradient techniques) for the calculation of the amplitudes and the relaxation times which fit the sum of exponential functions to the experimental data. This method is applied to simulated and experimental data in order to validate the algorithm

Keywords

electromagnetic fields; integral equations; magnetic relaxation; step response; time-domain analysis; transient analysis; Fredholm integral equation; amplitudes; decaying exponential sum; electromagnetic field problems; experimental data; exponential functions; gradient techniques; linear physical systems; relaxation time spectra; simulated data; step response; time domain method; Discrete transforms; Dispersion; Distribution functions; Frequency domain analysis; Integral equations; Laplace equations; Least squares approximation; Magnetic fields; Permittivity; Polarization;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.582536

Filename

582536