阈值随机共振及其在低质量浓度气体检测中的应用

Application of threshold stochastic resonance in low concentration gas detecting

提出利用阈值随机共振系统检测低质量浓度气体的方法.对传感器检测信号进行预处理以满足随机共振系统的要求,输入单阈值检测器,采用反映系统输入输出信号之间相关性的互相关系数作为阈值随机共振的表征.对系统的阈值参数进行优化,对最大互相关系数和气体质量浓度的相关性进行回归分析.实验结果表明,在该类系统中,不但存在阈值随机共振,而且随着气体质量浓度的增加最大互相关系数增加,采用最大互相关系数可以进行气体质量浓度的检测,最低检测限可以达到μg/L级别.

A low concentration gas detecting method based on threshold stochastic resonance（SR）was proposed.The raw data was pre-processed to satisfy the requirements of SR system and put into the＂one level threshold detector＂.Then the cross-correlation coefficient,which reflected the similarities between the input signal and the output signal,was used to evaluate the performance of SR system.Then the threshold parameters were optimized and the relationship between the maximum cross-correlation coefficient and gas mass concentration was analyzed.Experimental results show that threshold SR can be observed and the maximum cross-correlation coefficient increases with the increase of gas mass concentration.The maximum cross-correlation coefficient can be used to detect the gas mass concentration and the detectable limit can beμg/L level.