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1 Polish Journal of Chemistry

1 2004

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Frequency Distribution of Chemical Oscillations in the Closed belousov-Zhabotinsky Reaction

Darowicki K., Felisiak W.

Polish Journal of Chemistry

2004

Vol. 78 / nr 4

575-582

The potential registers of chemical oscillations, generated in the closed Belousov- Zhabotinsky reaction, have been submitted to detail spectral analysis using two algorithms based on the Fourier transform. It has been found that for selected stationary fragments of this signal the FFT algorithm distinctly reflects the strength of the spectral components contained in an exemplary potential register of BZ reaction. The temporal localization of these components is hidden in the phase of the spectrum, what makes the drawing of correct conclusions about the process investigated impossible. The cone-shape distribution, belonging to the group of joint time-frequency transformations, has been proposed as a proper method of nonstationary signals analysis. Spectrograms obtained by the above method have been presented, showing frequency evolution of chemical oscillations in time domain and their energy distribution simultaneously. Good reproducibility of spectrograms for potential registers of different time courses has been found. On the basis of harmonic components analysis the linear dependency between the frequency of harmonics and the composition of BZ reacting mixture has been noticed.