Improved Model for Simulating Impedance Spectroscopy.
Improved Model for Simulating Impedance Spectroscopy.
(819 K)
Coverdale, R. T.; Jennings, H. M.; Garboczi, E. J.
Computational Materials Science, Vol. 3, 465-474, 1995.
Keywords:
building technology; impedance spectroscopy
Abstract:
A numerical method for simulating the
frequency-dependent impedance response of multi-phase
composite materials has been developed. The algorithm
takes as input (1) a digital image of a microstructure,
in two or three dimensions, of any specified composite
material, and (2) the frequency-dependent electrical
properties of the individual phases of the composite.
An impedance spectrum of any frequency range can then be
computed using a conjugate gradient algorithm operating
on a finite difference solution scheme of Laplace's
equation. Examples are given of the impedance of
analytically solvable microstructures, to validate the
algorithm, and of a random system, to test the
usefulness of two different effective medium theories.
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899