A Fourier Transform Impedance Spectrometer using Logarithmically Spaced Time Samples

Abstract

Abstract A Fourier transform impedance spectrometer is described which is based on a transform algorithm using logarithmically spaced time samples. Thereby, the computational effort of Fourier transformation, which in electrochemistry constitutes the main problem of the application of the Fourier transform method, is substantially reduced. The spectrometer permits the performance of impedance measurements in the frequency range from 1 Hz to 10 5 Hz within a few seconds. Moreover, the impedance spectrometer mainly consists of devices, which are commonly available in electrochemical laboratories (e.g., microcomputer, storage oscilloscope, potentiostat).