We demonstrate the phenomenon of stochastic resonance in a
nonlinear chemical reaction. The term “stochastic
resonance” (SR) denotes the detection of a weak periodic signal in a
noisy system displaying a threshold. If
the sum of the periodic signal and the noise amplitude crosses the
threshold, an output pulse is triggered. At
an optimal noise amplitude the distribution of pulse intervals as well
as the signal-to-noise ratio will pass
through a maximum. In the continuously stirred tank reactor (CSTR)
experiments we superimpose a periodic
flow rate signal on an excitable focal steady state located near a Hopf
bifurcation in the Belousov−Zhabotinsky
(BZ) reaction. In the Showalter−Noyes−Bar-Eli model of this
reaction we vary the perturbation frequency
and amplitude as well as the pulse length of the applied noise to
elaborate the optimal conditions for stochastic
resonance to occur in the model.
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