Title :
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
fDate :
3/1/1997 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
