Application of non-stationary techniques in the analysis of electrochemical noise

Approaches to the electrochemical noise (EN) analysis are generally based on the assumption of its stationarity. In spite of usability of such methodology, occurrences of non-stationary signals are rather frequent in the practice. The methods of overcoming this drawback are presented in the paper. Applications of short-time Fourier transformation are discussed. It utilizes the concept of time-localized analyzing functions generated by appropriately chosen sliding time-domain window. Such technique, applied in discrete time measurement regime yields time-dependent frequency EN decomposition. Additionally, the authors introduce the concept of time dependent spectral noise response and spectral noise resistance.