New methods of spectral analysis of current oscillations of electrochemical processes

Spectral analysis was carried out by Fourier and Gabor transformation of a nonstationary process. It is shown that spectral analysis by Gabor transfor mation correctly reflects the analyzed signal of varying spectral compositi on. Fourier transformation is an averaged spectral characteristic. Spectral analysis of anodic current oscillations of copper dissolution in sulfate s olution was performed. It was found that current oscillations are a composi tion of three simple oscillators. The intensity of frequency bands decrease s with time. Instantaneous frequencies of each band also decrease in the fu nction of time. Spectral analysis by the Fourier method does not correctly reflect the real changes of analyzed oscillations. Gabor transformation acc urately reflects oscillation changes in time. This type of spectral analysi s is a useful tool in the analysis of electrochemical oscillations. (C) 200 1 The Electrochemical Society.