Title: Instantaneous impedance measurements on aluminium using a Schroeder multisine excitation signal
Authors: Van Gheem, E ×
Vereecken, J
Schoukens, Joannes
Pintelon, R
Guillaume, P
Verboven, P
Pauwels, L #
Issue Date: Jul-2004
Publisher: Pergamon-elsevier science ltd
Series Title: Electrochimica Acta vol:49 issue:17-18 pages:2919-2925
Abstract: Time-varying phenomena, such as crystallographic pitting corrosion, can be investigated by electrochemical impedance spectroscopy (EIS). For this purpose, a stepped sine excitation is most frequently used. However, when the frequency ranges from 25 Hz down to 15 mHz this experiment takes at least 30 min. In this work a periodic Schroeder multisine excitation signal is presented, by which the measurement time can be reduced to 2 min for the same frequency range. To evaluate the correctness of the EIS results obtained with the multisine, data was acquired for aluminum (99.5 wt.%) immersed in 0.5 M NaCl with oxygen bubbling by means of a stepped sine, next a multsine and finally a stepped sine excitation. From the spectra obtained with both stepped sines a new virtual spectrum is calculated as if all excited frequencies would have been recorded at the moment when the multisine was imposed to the system. A comparison of the multisine spectrum with this interpolated spectrum was then used for validation. The results show that the instantaneous behaviour of a time-varying system, observed during EIS is better approximated by the use of a multisine excitation signal. Moreover, the approximation further ameliorates when the immersion time evolves. (C) 2004 Elsevier Ltd. All rights reserved.
ISSN: 0013-4686
Publication status: published
KU Leuven publication type: IT
Appears in Collections:ESAT - STADIUS, Stadius Centre for Dynamical Systems, Signal Processing and Data Analytics
× corresponding author
# (joint) last author

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