Authors:
Guillaume Becq
;
Alina Voda
;
Gildas Besançon
;
Pierre-Olivier Amblard
and
Olivier Michel
Affiliation:
Univ. Grenoble Alpes, CNRS and GIPSA-Lab, France
Keyword(s):
Constant Phase Element, CPE, EEG, Electroencephalogram, Fractional Order System, Frequency-based Identification, Head Phantom, Impedance Spectroscopy.
Related
Ontology
Subjects/Areas/Topics:
Informatics in Control, Automation and Robotics
;
Signal Processing, Sensors, Systems Modeling and Control
;
System Identification
;
System Modeling
Abstract:
In this study, an original experimental setup is proposed to analyze the transfer function of an electroencephalographic
(EEG) measurement chain: this setup allows to control electrodes inserted into an electrolytic
medium, and observe the electrical potentials at different points with electrodes connected to an electroencephalographic
recording system. Experimental transfer functions are obtained that enable to characterize the
influence of the electrolyte, the electrode-electrolyte interfaces, and the medium itself. A theoretical model
containing so-called constant phase elements is then proposed and analysed to understand the behaviour of
the transfer function in Bode or Nyquist representations. Experimental and theoretical systems are finally
compared.