基于TDLAS技术的大气痕量CO监测研究与应用

Research and application of atmospheric trace CO monitoring based on TDLAS technology

目的:大气环境中一氧化碳(CO)浓度的变化会影响大气循环和人的身体健康,需要准确监测环境中CO浓度的变化。方法:基于可调谐半导体激光吸收光谱(tunable diode laser absorption spectroscopy,TDLAS)技术结合中红外带间级联激光器(interband cascade laser,ICL),研制了一种新型环境CO气体监测系统。结果:成功搭建CO监测系统,并进行CO气体浓度监测实验。实验室中测量0~2000 nmol/mol微量CO,得到系统线性误差为0.31%F.S.,线性相关系数R达到0.99999,检出限为3.46 nmol/mol。在南京某环境监测空气站与基于非色散红外吸收光谱技术的AM-5300分析仪对比测量,两者数据拟合相关系数为0.964582,数据变化趋势吻合。结论:我们研制的监测系统具有测量准确度高、检出限低和稳定性好等优势,可为环境监测提供可靠的数据支持。

Aims:The concentration of carbon monoxide(CO)in the atmospheric environment affects the atmospheric cycle and physical health.So it is necessary to accurately monitor the CO concentrations in the environment.Methods:We developed a new environmental CO monitoring system based on the tunable diode laser absorption spectroscopy(TDLAS)technology combined with interband cascade laser(ICL)in mid-infrared.Results:The experiments of CO concentration monitoring were conducted with the monitoring system.The linearity error of the experiment with a CO concentration of 0~2000 nmol/mol was 0.31%F.S..The linear correlation coefficient was 0.99999;and the detection limit was 3.46 nmol/mol when measuring trace CO from 0 to 2000 nmol/mol in the laboratory.At an environmental monitoring station in Nanjing,compared with the AM-5300 analyzer based on non-dispersive infrared absorption spectroscopy,the correlation coefficient was 0.964582;and the trend of data change was consistent.Conclusions:The monitoring system has the advantages of high measurement accuracy,low detection limit and good stability,which can provide reliable data support for environmental monitoring.