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

doi:10.1088/1674-1056/21/9/090701

Abstract In this paper, we present the 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%.

Keywords: environmental pollution measurements optical measurement technology non-dispersive infrared technique gas analysis

Received: 07 December 2011
Revised: 21 February 2012
Accepted manuscript online:

PACS:	07.88.+y	(Instruments for environmental pollution measurements)
	42.87.-d	(Optical testing techniques)
	42.72.Ai	(Infrared sources)
	33.20.Ea	(Infrared spectra)

Fund: 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), and the Excellent Youth Scientific Foundation of Anhui Province, China (Grant No. 10040606Y28).

Corresponding Authors: Liu Wen-Qing
E-mail: wqliu@aiofm.ac.cn

Cite this article:

Sun You-Wen (孙友文), Zeng Yi (曾议), Liu Wen-Qing (刘文清), Xie Pin-Hua (谢品华), Chan Ka-Lok (陈嘉乐), Li Xian-Xin (李先欣), Wang Shi-Mei (汪世美), Huang Shu-Hua (黄书华) Cross-interference correction and simultaneous multi-gas analysis based on infrared absorption 2012 Chin. Phys. B 21 090701

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