Quantitative analysis of multi-component gas mixture based on AOTF-NIR spectroscopy

Huimin Hao; Yong Zhang; Junhua Liu

doi:10.1117/12.782689

21 November 2007 Quantitative analysis of multi-component gas mixture based on AOTF-NIR spectroscopy

Huimin Hao, Yong Zhang, Junhua Liu

Proceedings Volume 6723, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 672305 (2007) https://doi.org/10.1117/12.782689
Event: 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 2007, Chengdu, China

Abstract

Near Infrared (NIR) spectroscopy analysis technology has attracted many eyes and has wide application in many domains in recent years because of its remarkable advantages. But the NIR spectrometer can only be used for liquid and solid analysis by now. In this paper, a new quantitative analysis method of gas mixture by using new generation NIR spectrometer is explored. To collect the NIR spectra of gas mixtures, a vacuumable gas cell was designed and assembled to Luminar 5030-731 Acousto-Optic Tunable Filter (AOTF)-NIR spectrometer. Standard gas samples of methane (CH₄), ethane (C₂H₆) and propane (C₃H₈) are diluted with super pure nitrogen via precision volumetric gas flow controllers to obtain gas mixture samples of different concentrations dynamically. The gas mixtures were injected into the gas cell and the spectra of wavelength between 1100nm-2300nm were collected. The feature components extracted from gas mixture spectra by using Partial Least Squares (PLS) were used as the inputs of the Support Vector Regress Machine (SVR) to establish the quantitative analysis model. The effectiveness of the model is tested by the samples of predicting set. The prediction Root Mean Square Error (RMSE) of CH₄, C₂H₆ and C₃H₈ is respectively 1.27%, 0.89%, and 1.20% when the concentrations of component gas are over 0.5%. It shows that the AOTF-NIR spectrometer with gas cell can be used for gas mixture analysis. PLS combining with SVR has a good performance in NIR spectroscopy analysis. This paper provides the bases for extending the application of NIR spectroscopy analysis to gas detection.

Citation Download Citation

Huimin Hao, Yong Zhang, and Junhua Liu "Quantitative analysis of multi-component gas mixture based on AOTF-NIR spectroscopy", Proc. SPIE 6723, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 672305 (21 November 2007); https://doi.org/10.1117/12.782689

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KEYWORDS

Spectroscopy

Near infrared

Gases

Liquids

Quantitative analysis

Feature extraction

Near infrared spectroscopy

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