how i can fit a certain nyquist plot to a certain equivelent circuit model rather than randles model...how i can build my circuit?? If i have a diffusion for example...how can i know when do i put the circuit elements in series and when in parallel??when do i use open warburg element or short one?? When do i use CPE or QPE?
Please rephrase your question, I find it rather unclear (this may explain why nobody answers).
Dear prof philippe
my question is how i can fit a certain nyquist plot to a certain equivelent circuit model rather than randles model...how i can build my circuit?? If i have a diffusion for example...how can i know when do i put the circuit elements in series and when in parallel??when do i use open warburg element or short one?? When do i use CPE or QPE?
If I understand correctly, you have an experimentally obtained frequency response (in the form of a Nyquist plot), and you would like to find the transfer function corresponding to this frequency response. Moreover, you would like to express this transfer function in terms of a circuit. Determining a transfer function from a frequency response is called "identification", and there is a Matlab toolbox dedicated to that (System Identification Toolbox). It works very well for rational transfer, but you problem might be more delicate if diffusion is involved.
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