单结管电路中的随机共振过程

Stochastic resonance process in unijunction transistor circuits

为考察二阶非线性电路响应中是否存在随机共振过程 ,用噪声信号和周期信号同时激励二阶非线性单结管电路 ,并观察其响应和测量输出响应信号的信噪比。结果表明 :在一定的条件下 ,增大输入噪声的值不仅不降低输出响应信噪比 ;反而迅速增加输出响应的信噪比 ,使输出响应中周期信号的分量反而加强 ,而且输出响应的信噪比对于输入噪声的变化具有“共振”形状的曲线。从而证明了二阶非线性单结管电路不仅是混沌系统 ,也是随机共振系统 。

This paper examines whether the stochastic resonance process will occur in the non linear second order circuits. A unijunction transistor second circuit used as an experiment circuit was forced by a bath with a specified signal period and noise. Increasing the input noise may increase the signal to noise ratio (SNR) of the output response ( V(t) ) within the element's parameter region indicating that the periodic components of V(t) increase as the input noise increases. The relationsip between the variation of the SNR of the V(t) curve and the noise is similar to the that of the resonance. Experiment results show that the unijunction transistor second circuit is not only a chaotic system but also a stochastic resonance system. The phenomenon of stochastic resonance many occur in a chaos system.