甲烷气体浓度测量的研究

摘要

In order to improve the sensitivity and real-timely measurement of the methane gas concentration,this paper used annular cavity ring-down technology to design the methane gas concentration in the measurement experiment system.The theoretical analysis obtained that the change of gas concentration and the cycle of light pulses in ring-down time is inversely proportional to the number of times,and is proportional to the measurement of ring-down time.Methane test of the experimental results show that the increase of gas concentration will lead to the increase of the logarithmic curve of ring-down,the decrease of corresponding ring-down time.The greater the gas concentration is,the stronger light absorption ability is.Gas concentration and ring-down time conform to the theoretical conclusions from this article.Through the application of gas measuring system,the feasibility of the system was further verified,which is also in line with the theory of relationship.The results of the study provides a new experimental system for gas concentration measurement and model reference.%为了改进甲烷气体浓度测量实时性和灵敏度,采用环形腔衰荡技术设计了甲烷气体浓度测量实验系统.理论分析得到了气体浓度的变化和在衰荡时间内光脉冲的循环次数成反比,与测量衰荡时间成正比.实验结果表明:随气体浓度的增加,对数衰荡曲线的值增大,对应的衰荡时间逐渐减小;气体浓度越大,对光的吸收能力就越强.气体浓度与衰荡时间符合本文得到的理论关系.研究结果为气体浓度测量提供了新的实验系统和模型参考.