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摘要:
SO2 and NO2 are the most important pollution in atmosphere.An optimized long path (LP) differential optical absorption spectroscopy (DOAS) system of high light intensity at an ultraviolet (UV) wavelength is proposed and used to measure the concentration of SO2 and NO2 simultaneously.In contrast to the traditional DOAS,the system adopted a Y-type optical fiber structure instead of a combination of mirrors in the telescope.The UV light intensity test shows that the light intensity of UV can arrive to above 80% of the max measuring range when the light path reaches 135 m,and the integral time of the spectrograph is only 15 ms.The system is proved to be efficacious through laboratory calibration.The maximum error of SO2 calibration is 4.19%,and is 5.22% for NO2.The error of the SO2 and NO2 mixture calibration is within 10%.Field measurement is implemented in a wastewater treatment plant in winter.The measurement light path is 738 m.The concentration of SO2 varies from 6 μg/m3 (2.26 ppb) to 20 μg/m3 (7.52 ppb),and the concentration of NO2 varies from 100 μg/m3 (53.2 ppb) to 200 μg/m3 (106.4 ppb) approximately.The results are in accordance with the data from a monitoring station nearby in magnitude order and variation tendency mostly.
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来源期刊 中国光学快报(英文版) 学科
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年,卷(期) 2020,(2) 所属期刊栏目
研究方向 页码范围 28-33
页数 6页 分类号
字数 语种 英文
DOI 10.3788/COL202018.021201
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中国光学快报(英文版)
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1671-7694
31-1890/O3
大16开
上海市嘉定区清河路390号(上海800-211信箱)
4-644
2003
eng
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