Studies on the Data Processing Method in Chlorine Measurement by Differential Optical Absorption Spectroscopy Technology
YE Cong-lei, XIE Pin-hua*, QIN Min, LI Ang, LING Liu-yi, HU Ren-zhi, YANG Jing-wen
1. Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031，China 2. National Engineering Research Center for Environmental Optical Monitoring Instrument, Hefei 230031, China
Abstract：In this paper, based on Differential Optical Absorption Spectroscopy (DOAS) technique, experimental measurements of chlorine was carried out in the laboratory with a small self-built experimental system. In dealing with the standard cross-section of chlorine, we presented two different methods: triangle filtering and polynomial fitting. Experiments showed that the concentration of chlorine could be accurately retrieved by the latter one. Simulation results showed that the error of retrieval result by fifth-order polynomial fitting was smaller than by other orders and an actual retrieval example shows that the fitting spectrums were nearly coincident with the measured spectrums with a residual delta(peak to peak) below 5‰;The results measured in different sample pools displayed a high linearity of 0.996 1 by this method. The main sources of errors during the entire experiment were simply analyzed. According to the experimental result above, it is feasible to detect chlorine using DOAS technology by polynomial fitting.
Key words：Chlorine;Differential absorption cross-section spectroscopy technology;Polynomial fitting;Sources of errors
叶丛雷，谢品华*，秦 敏，李 昂，凌六一，胡仁志，杨靖文 . 差分吸收光谱技术测量氯气的数据处理方法研究[J]. 光谱学与光谱分析, 2012, 32(07): 1734-1738.
YE Cong-lei, XIE Pin-hua*, QIN Min, LI Ang, LING Liu-yi, HU Ren-zhi, YANG Jing-wen . Studies on the Data Processing Method in Chlorine Measurement by Differential Optical Absorption Spectroscopy Technology. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2012, 32(07): 1734-1738.
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