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Menu: Linear KramersKronig Test
Analysis / Linear KK Check.
Generates a plot of residuals between imaginary (real) part of
impedance of Voigt RC model and imaginary (real) part of impedance of
experimental data.
Linear KramersKronig test realized in this program is based on
approach developed by M.E. Orazem and coworkers and further modified
by B. Boukamp in [J. Electrochem. Soc., 142 (1995) 1885].
In this approach the KramersKronig transform is replaced by the fit to
the Voigt RC model. If the data cannot be well approximated by the
Voigt model containing reasonable number of RC pairs, it means that
data are not transformable. The routine uses fit of data to the
following equations:
and
Where τ_{k} are time constants (τ_{k} = R_{k}C_{k})
distributed logarithmically within the measured frequency range.
Examination of the relative residual plot between measured and
approximated spectra give information about the measured data quality.
To prevent noise averaging, the number of time constants τ_{k}_{ }is
somewhat smaller than number of data points. You can use different
number of time constants with respect to data points by selecting Time constants/Data points ratio in Linear KramersKronig test form. Click Check button in Linear KramersKronig test form to restart test after changing of Time constants/Data points ratio.
See also Logarithmic KramersKronig test
EIS Spectrum Analyser, 2008

