基于TDLAS甲烷检测系统的长光程池研究与设计

采用Herriott型长光程池结构原理,通过理论研究和仿真分析得到一定条件下Herriott池反射次数最优解,利用镀膜凹面镜作为反射镜,在池体上集成光学元件,进行了长光程、低成本、小体积光程池的设计。经过实验验证,所设计的物理长23cm,体积243mL的光程池,能达到11m有效光程长,并搭建在TDLAS甲烷检测系统中,结果表明检测下限最低浓度为476 ppb。这为低浓度、高精度、微型化的TDLAS甲烷检测系统的推广应用提供了一种有效的途径。

Research and design of long optical range cell based onTDLAS methane detection system

In this paper,the structural principle of Herriott type long optical range cell is adopted,and the optimal solution for the number of reflections of the Herriott cell under certain conditions is obtained through theoretical research and simulation analysis,and the design of a long optical range,low cost and small volume optical range cell is carried out by utilizing coated concave mirrors as mirrors,and by integrating the optical elements in the cell body.After experimental verification,the designed light range cell with a physical length of 23cm and volume of 243 mL of optical range cell can achieve 11 m effective optical range length,and built in the TDLAS methane detection system.The results show that the lower limit of detection is the lowest concentration of 47.6 ppb,which provides an effective way promote the application of the low concentration,high precision,and miniaturized TDLAS methane detection system.