FTIR法测量中水汽吸收对测量精度影响的初步研究  

Preliminary Study on Influence of Water Vapor Absorption on Measurement Precision by FTIR

作　　者：李相贤[1] 高闽光[1] 徐亮[1] 魏秀丽[1] 童晶晶[1] 程巳阳[1] 冯明春[1] 

机构地区：[1]中国科学院安徽光学精密机械研究所中国科学院环境光学与技术重点实验室,安徽合肥230031

出　　处：《大气与环境光学学报》2011年第6期438-442,共5页Journal of Atmospheric and Environmental Optics

基　　金：国家自然科学基金项目(40905011)资助

摘　　要：水汽吸收线分布于整个中红外波段,它的存在干扰红外光谱的定量分析。分析了水汽谱吸收对测量精度的影响。利用傅里叶变换红外光谱法分别测量了经过干燥处理的待测气体和未经干燥处理的待测气体,并分别对两次测量中CO、CO_2、N_2O和CH_4浓度的测量精度及检测限进行了比较。实验表明:对样气进行干燥预处理可以提高测量精度和检测限。Absorption of water vapor distributes in the whole mid-infrared bands;and it interferes with the quantitative analysis of infrared spectra.Impact of spectral absorption of water vapor on measurement precision is analyzed.The gas without dryness and after dryness are measured by Fourier transform infrared spectroscopy（FTIR）,and the precision and detection limits of CO,CO_2,N_2O and CH_4 are compared in the different measurements.The results show that the precision and detection limits were improved after drying of the sample gas.

关 键 词：傅里叶变换红外光谱法 测量精度 检测限 水汽 

分 类 号：O657.33[理学—分析化学]