大气与环境光学学报 ›› 2011, Vol. 6 ›› Issue (6): 438-442.

• 环境光学监测技术 • 上一篇    下一篇

FTIR法测量中水汽吸收对测量精度影响的初步研究

李相贤 高闽光 徐亮 魏秀丽 童晶晶 程巳阳 冯明春   

  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
  • 出版日期:2011-11-28 发布日期:2011-11-18
  • 作者简介:李相贤,男,1983年4月生,山东金乡人,中国科学院安徽光学精密机械研究所在读研究生,研究方向:环境大气傅里叶变换红外光谱监测技术. Email:lixx@aiofm.ac.cn
  • 基金资助:

    国家自然科学基金项目(40905011)资助

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

Li Xiang-xian Gao Min-guang Xu Liang Wei Xiu-li Tong Jing-jing Cheng Si-yang Feng Ming-chun   

  1. Key Laboratory of Environment Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences,Hefei 230031, China
  • Published:2011-11-28 Online:2011-11-18

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。利用傅立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、CO2、N2O和CH4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.

关键词: 傅立叶变换红外光谱法, 测量精度, 检测限, 水汽

Abstract:

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, CO2, N2O and CH4 are compared in the different measurements. The results show that the precision and detection limits were improved after drying of the sample gas.

Key words: Fourier transform infrared spectroscopy, measurement precision, detection limits, water vapor

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