Forma, Vol. 15 (No. 3), pp. 219-225, 2000
Original Paper

Noise-Induced Entrainment between Two Coupled Chemical Oscillators in Belouzov-Zhabotinsky Reactions

Kazuyuki Fujii1, Daisuke Hayashi1, Osamu Inomoto1,2 and Shoichi Kai1

1Department of Applied Physics, Kyushu University, Fukuoka 812-8581, Japan
2Optical Engineering Laboratory, The Institute of Physical and Chemical Research, Hirosawa 2-1, Wako, Saitama 351-0198, Japan

(Received April 19, 2000; Accepted May 19, 2000)

Keywords: Noise Synchronization, Stochastic Resonance, Entrainment, Chemical Oscillation, BZ Reaction

Abstract. The entrainment dynamics of two chemical-oscillators in an excitable medium separated by some distance d was experimentally studied in the light-sensitive Belousov-Zhabotinsky reaction under application of external noise. Two chemical-oscillators were always spontaneously synchronized at sufficiently small d or frequency difference in the absence of noise. For insufficient distance to entrain each other, however, the frequency and phase were self-synchronized by application of noise. Increasing the noise intensity the entrainment frequency area between two oscillators increased and showed a maximum at a certain noise intensity, that is, an optimum noise intensity existed. We call this the noise-synchronaization phenomenon.

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