基于差分吸收光谱法的烷烃气体检测系统的研制

Study on the System for Detecting Hydrocarbon with Differential Optical Absorption Spectroscopy

利用差分吸收光谱(DOAS)技术研制开发了一套烷烃类气体检测实验系统,在该实验系统上测量了CH4的吸收光谱以及吸收截面,并利用这些参数开展了CH4气体浓度反演算法的研究.实验结果表明:在常温常压下,CH4的检测结果与标准浓度之间的线性拟合系数R2为0.9998,误差小于3%,CH4的最低检测限为0.01%.这些工作为烷烃光谱录井仪的研发奠定了基础.

In this paper,differential optical absorption spectroscopy（DOAS） technology was used to develop a hydrocarbon gas detection experimental system.The parameters of the absorption spectrum and absorption cross-section of methane can be obtained by using this device,which is usful to carry out the experimental analysis of the methane concentration retrieval algorithm.The experimental results show that,under normal temperature and pressure,the liner regression coefficient R2 between methane detection results and standard concentration is 0.9998,the error is less than 3%,and the minimum detection limit of methane can reach 0.01%.These results will helpful for the futher research and development of a spectrum logging analyzer to detect hydrocarbon gas.