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Time-Frequency Characteristics of Chemical Oscillations. Experimental and Model Studies

Darowicki K., Felisiak W.

Polish Journal of Chemistry

2004

Vol. 78 / nr 9

1269-1278

Chemical oscillations exhibit nonlinear, and nonstationary features and their complete characterization cannot be accomplished via classical Fourier transform. That is why there is a need for another analysis framework in joint time-frequency domain. In this paper the authors propose a proper methodology of spectral analysis of Belousov-Zhabotinsky (BZ) reaction. The short time Fourier transformation (STFT) has been applied to the analysis of potential registers of BZ reaction in a batch reactor. The method allowed finding the frequency and energy distribution of chemical oscillations in the function of time. The similarities and the differences between the spectrograms generated for the experimental data and simulated time series, based on the modified Oregonator model, are briefly discussed.