Nonlinear Theory and Its Applications, IEICE
Online ISSN : 2185-4106
ISSN-L : 2185-4106
Special Issue on Recent Progress in Nonlinear Theory and Its Applications
Numerical extraction of Cole-Cole impedance parameters from step response
Todd J. FreebornBrent MaundyAhmed Elwakil
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2011 Volume 2 Issue 4 Pages 548-561

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Abstract

In this paper we propose a numerical method to extract the four parameters (Ro, R, C, and α) that characterize a single-dispersion Cole-Cole impedance model from its step response, based on modelling the step response using fractional calculus, without requiring direct measurement of the real and imaginary impedance parts. MATLAB simulations using Cole-Cole impedances of fruit tissues with α<1, PSPICE simulations and experimental results using a Cole-Cole model with α=1 are given to verify the method. Extracted impedance parameters show less than 0.1% relative error in simulation and less than 10% error in experimental results for the extracted impedance parameters.

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© 2011 The Institute of Electronics, Information and Communication Engineers
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