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Simultaneous measurement of SO2 and NO2 concentration using an optical fiber-based LP-DOAS system

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Abstract

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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DOI:10.3788/COL202018.021201

所属栏目:Research Articles

基金项目:This work was supported by the National Natural Science Foundation of China (No. 91741203) and the Science and Technology Plan of Zhejiang Province (Nos. 2018C03041 and 2018C03007).

收稿日期:2019-08-04

录用日期:2019-11-07

网络出版日期:2020-01-07

作者单位    点击查看

Jieshu Zou:State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
Fei Wang:State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China

联系人作者:Fei Wang(wangfei@zju.edu.cn)

备注:This work was supported by the National Natural Science Foundation of China (No. 91741203) and the Science and Technology Plan of Zhejiang Province (Nos. 2018C03041 and 2018C03007).

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引用该论文

Jieshu Zou, Fei Wang, "Simultaneous measurement of SO2 and NO2 concentration using an optical fiber-based LP-DOAS system," Chinese Optics Letters 18(2), 021201 (2020)

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