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On Selection of the Perturbation Amplitude Required to Avoid Nonlinear Effects in Impedance Measurements
Author(s) -
Hirschorn Bryan,
Tribollet Bernard,
Orazem Mark E.
Publication year - 2008
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1560/ijc.48.3-4.133
Subject(s) - amplitude , perturbation (astronomy) , electrical impedance , nonlinear system , chemistry , control theory (sociology) , physics , optics , quantum mechanics , computer science , control (management) , artificial intelligence
Numerical simulations of electrochemical systems were used to explore the influence of large‐amplitude potential perturbations on the measured impedance response. The amplitude of the input potential perturbation used for impedance measurements, normally fixed at a value of 10 mV for all systems, should instead be adjusted for each experimental system. Guidelines are developed for selection of appropriate perturbation amplitudes. A characteristic transition frequency is defined that can be used to tailor a frequency‐dependent input signal to optimize signal‐to‐noise levels while maintaining a linear response.