光谱学与光谱分析 |
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Monitoring of Oxygen Concentration Based on Tunable Diode Laser Absorption Spectroscopy |
ZHANG Shuai, DONG Feng-zhong*, ZHANG Zhi-rong,WANG Yu, KAN Rui-feng,ZHANG Yu-jun,LIU Jian-guo, LIU Wen-qing |
Key Laboratory of Environmental Optics & Technology, Anhui Institute of Optics & Fine Mechanics, Chinese Academy of Sciences, Hefei 230031,China |
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Abstract Oxygen is a widely used important gas in the industrial process. It is very meaningful to on-line monitor the oxygen concentration for the enhancement of combustion efficiency and reduction in environmental pollution. Tunable diode laser absorption spectroscopy (TDLAS) is a highly sensitive, highly selective and fast time response trace gas detection technique. With the features of tunability and narrow linewidth of distributed feedback (DFB) diode laser and by precisely tuning the laser output wavelength to a single isolated absorption line of the gas, TDLAS technique can be utilized to accurately implement gas concentration measurement with very high sensitivity. In the present paper, the authors used a DFB laser was used as the light source, and by employing wavelength modulation method and measuring the second harmonic signal of one absorption line near 760 nm of oxygen molecule, the authors built a system for online monitoring of oxygen concentration. The characteristics of the system are as follows: the scope of detection is 0.01%-20%; detection accuracy is 0.1%, long term stability is 1%.
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Received: 2008-10-08
Accepted: 2009-01-12
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Corresponding Authors:
DONG Feng-zhong
E-mail: fzdong@aiofm.ac.cn
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