From Nyquist plot to real conductivity spectra (sigma)

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Discussion Overview

The discussion revolves around the conversion of Nyquist plots into real conductivity spectra as a function of frequency. Participants are exploring the mathematical relationships and formulas necessary for this transformation, particularly in the context of impedance data analysis.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant seeks to understand how to mathematically convert a Nyquist plot into a plot of real conductivity versus frequency, indicating a limitation in their current software.
  • Another participant notes that the Nyquist plot already displays the real part of the complex conductivity and questions whether the imaginary part is also needed for the transformation.
  • A participant expresses that they have achieved a desired result through a method involving admittance but expresses uncertainty regarding the formulas used in the process.
  • Another participant requests to see the method used by the individual who achieved the desired plot, indicating interest in the approach taken.

Areas of Agreement / Disagreement

There is no clear consensus among participants regarding the necessity of the imaginary part of conductivity or the specific methods to be used for the conversion, indicating that multiple views and uncertainties remain in the discussion.

Contextual Notes

Participants have not fully detailed their methods or assumptions, and there may be unresolved mathematical steps involved in the conversion process.

Who May Find This Useful

Researchers and practitioners involved in impedance spectroscopy, materials science, and electrical engineering may find this discussion relevant, particularly those interested in data analysis techniques related to conductivity measurements.

Olha
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TL;DR
From Nyquist plot to real conductivity spectra (sigma) vs frequency
Hi, I have data of impedance but due to limitation of software after measurement I do not receive numerical values for admittance and real conductivity vs frequency. How mathematically I can convert Nyquist plot into plot real conductivity vs frequency?
conductivity spectra.jpg
 
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Your plot already shows the real part of the complex conductivity. Do you need the imaginary part?
 
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The image is the result I want to get. For now I have Nyquist plot Im vs Re, which I would like to transform it to the plot you see attached, real part of complex conductivity vs frequency. I have done it trough admittance but I am not sure in all formulas I used for it...
 
Please, show us your method.
 
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Likes   Reactions: SammyS

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