Goto Yoshitomo, Shishibe Atsuya, Orihara Hiroshi, Residori Stefania, Nagaya Tomoyuki
Graduate School of Engineering, Oita University, Oita 870-1192, Japan.
Beppu University Junior College, Beppu 874-8501, Japan.
Phys Rev E. 2020 Dec;102(6-1):062702. doi: 10.1103/PhysRevE.102.062702.
Stochastic resonance is a noise phenomenon that benefits applications such as pattern formation, neural systems, microelectromechanical systems, and image processing. This study experimentally clarifies that the orientation of the liquid crystal molecules was switched between two stable positions when stochastic resonance was induced by colored noises in a liquid crystal light valve with optical feedback. Ornstein-Uhlenbeck and dichotomous noises were used for colored noise, and the noise was applied to the drive voltage of the liquid crystal light valve. The signal-to-noise ratio was measured with respect to changes in the noise type, noise intensity, and autocorrelation time of the noise. It was found that typical stochastic resonance was observed with a noise autocorrelation time of approximately 20 ms or more for both noise types, and dichotomous noise further enhanced the stochastic resonance compared to the Ornstein-Uhlenbeck noise. This suggests that it is possible to maximize stochastic resonance in a liquid crystal light valve by optimizing the conditions of colored noise.
随机共振是一种噪声现象，它有益于诸如图案形成、神经系统、微机电系统和图像处理等应用。本研究通过实验阐明，在具有光反馈的液晶光阀中，当由有色噪声诱发随机共振时，液晶分子的取向在两个稳定位置之间切换。采用奥恩斯坦-乌伦贝克噪声和二分噪声作为有色噪声，并将该噪声施加到液晶光阀的驱动电压上。针对噪声类型、噪声强度和噪声自相关时间的变化测量了信噪比。结果发现，对于两种噪声类型，当噪声自相关时间约为20毫秒或更长时，观察到典型的随机共振，并且与奥恩斯坦-乌伦贝克噪声相比，二分噪声进一步增强了随机共振。这表明通过优化有色噪声的条件，有可能在液晶光阀中使随机共振最大化。
