Cross-interference correction and simultaneous multi-gas analysis based on infrared absorption  

作　　者：孙友文 曾议 刘文清 谢品华 陈嘉乐 李先欣 汪世美 黄书华 

机构地区：[1]Key Laboratory of Environmental Optics&Technology,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences [2]School of Energy and Environment,City University of Hong Kong

出　　处：《Chinese Physics B》2012年第9期168-175,共8页中国物理B（英文版）

基　　金：Project supported by the National High Technology Research and Development Program of China (Grant No. 2009AA063006);the National Natural Science Foundation of China (Grant No. 40805015);the Excellent Youth Scientific Foundation of Anhui Province, China (Grant No. 10040606Y28)

摘　　要：In this paper, we present simultaneous multiple pollutant gases （CO2, CO, and NO） measurements by using the non-dispersive infrared （NDIR） technique. A cross-correlation correction method is proposed and used to correct the cross-interferences among the target gases. The calculation of calibration curves is based on least-square fittings with third-order polynomials, and the interference functions are approximated by linear curves. The pure absorbance of each gas is obtained by solving three simultaneous equations using the fitted interference functions. Through the interference correction, the signal created at each filter channel only depends on the absorption of the intended gas. Gas mixture samples with different concentrations of CO2, CO, and NO are pumped into the sample cell for analysis. The results show that the measurement error of each gas is less than 4.5%.In this paper, we present simultaneous multiple pollutant gases （CO2, CO, and NO） measurements by using the non-dispersive infrared （NDIR） technique. A cross-correlation correction method is proposed and used to correct the cross-interferences among the target gases. The calculation of calibration curves is based on least-square fittings with third-order polynomials, and the interference functions are approximated by linear curves. The pure absorbance of each gas is obtained by solving three simultaneous equations using the fitted interference functions. Through the interference correction, the signal created at each filter channel only depends on the absorption of the intended gas. Gas mixture samples with different concentrations of CO2, CO, and NO are pumped into the sample cell for analysis. The results show that the measurement error of each gas is less than 4.5%.

关 键 词：environmental pollution measurements optical measurement technology non-dispersive infrared technique gas analysis 

分 类 号：X831[环境科学与工程—环境工程] O657.33[理学—分析化学]