【摘要】 样品分析过程中 ,往往得到背景噪声很强的信号 ,尤其在微量和痕量水平 ;当信号的信噪比很小时 ,通常的方法不能满足检测要求 ,该文基于随机共振理论提出了一种新的弱信号的检测方法并对相关参数进行了讨论 ;方法是通过噪声的协调作用 ,获得系统的“共振” ,从而实现弱信号的检测 ,应用于模拟和实验信号的处理结果证明了方法的可行性更多还原

【Abstract】 A method, based on the theory of stochastic resonance, is presented for the detection of a weak signal in instrumental analysis. The interaction of input signal and noise in a nonlinear system will lead to the enhancement of the signal _ to _ noise(S/N) ratio. A maximum S/N can be attained by modulating an external noise, and thus the detection of weak signal achieved. The method was applied for detecting simulated signals and experimental chromatographic signals of weak intensity with satisfactory results. The method proved to be feasible.更多还原