非分散红外吸收光谱法空气痕量污染气体监测浓度算法  

Concentration Algorithm of Ambient Trace-Gas Monitoring with NDIR Absorption Spectroscopy

作　　者：陈晓宁[1,2] 刘建国[1,2] 司福祺[1,2] 刘文清[1,2] 

机构地区：[1]中国科学院安徽光学精密机械研究所环境光学与技术重点实验室,合肥230031 [2]安徽省环境光学监测技术重点实验室,合肥230031

出　　处：《光电工程》2008年第2期114-117,共4页Opto-Electronic Engineering

基　　金：国家高技术研究发展基金资助项目(2002AA641020)

摘　　要：针对城市痕量污染气体检测中,所测气体浓度低、吸收弱,采用两点标定和高浓度标气定标造成吸收曲线误差增大的问题,本文提出了采用低浓度标气、多点定标的方法来获得吸收曲线的方法来建立吸收方程。该方法是基于比尔-朗伯吸收定律的吸收方程,当测量气体浓度较低时,其浓度和吸光度呈线性关系来完成。采用低浓度标气、多点定标两种方法的结合,来获得测量气体的吸收曲线。试验结果表明,有很高的测量精度。Non-dispersive Infrared （NDIR） spectroscopic technique based on Lamber-beer law is used to detect trace gas in air. In the Lamber-beer law, approximation absorbance is linear to gas concentration. So we can make use of the low concentration of calibration gas and multilayer calibration correction to get the Lamber-beer law calibration. And quantitative analysis of the trace gas is performed by this calibration curve. This method avoids excessive curvature error of high concentration and two point calibration correction. The experimental results show that the method has good precision for quantitative analysis.

关 键 词：非分散红外 线性吸收 低浓度 多点定标 

分 类 号：X831[环境科学与工程—环境工程]