Stochastische Resonanz

Stochastic resonance is the counterintuitive effect of signal amplification through an increased noise level. A weak (usually periodic) signal is injected in a nonlinear system. On the addition of noise, the signal to noise level at the system's output increases, also, the distribution of residence times in the states of bi- or multistable systems shows a characteristic pattern. In experiments on YIG samples (Yttrium-Iron-Garnet) and different nonlinear circuits, the residence times shows this characteristic behaviour even in the absence of noise, when instead the internal fast chaotic dynamics of the system are used. This variety of stochastic resonance is called “noise-free” stochastic resonance, sine the roule of the noise is fulfilled by the intermittent chaotic dynamics of the system. Depending on the type of intermittency, the systems can show different sorts of stochastic resonance phenomena, e.g. stochastic multiresonance. Using model systems, we investigate these phenomena and compare the results with theoretical predictions.

Key words:

  • Stochastic Resonance
  • Chaos
  • Spinwaves
  • Intermittency