Measurements of atmospheric NO3 radicals in Hefei using LED-based long path differential optical absorption spectroscopy

doi:10.1088/1674-1056/25/2/024210

中国物理B ›› 2016, Vol. 25 ›› Issue (2): 24210-024210.doi: 10.1088/1674-1056/25/2/024210

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

Measurements of atmospheric NO₃ radicals in Hefei using LED-based long path differential optical absorption spectroscopy

Xue Lu(卢雪), Min Qin(秦敏), Pin-Hua Xie(谢品华), Jun Duan(段俊), Wu Fang(方武), Liu-Yi Ling(凌六一), Lan-Lan Shen(沈兰兰), Jian-Guo Liu(刘建国), Wen-Qing Liu(刘文清)

1. Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;
2. Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, China;
3. School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, China;
4. Institute of Electric and Information Technology, Anhui University of Science and Technology, Huainan 232001, China

收稿日期:2015-07-22 修回日期:2015-09-23 出版日期:2016-02-05 发布日期:2016-02-05
通讯作者: Min Qin E-mail:mqin@aiofm.ac.cn
基金资助:
Project supported by the "Strategic Priority Research Program" of the Chinese Academy of Sciences (Grant Nos. XDB05040200 and XDB05010500).

Measurements of atmospheric NO₃ radicals in Hefei using LED-based long path differential optical absorption spectroscopy

Xue Lu(卢雪)^1,2, Min Qin(秦敏)¹, Pin-Hua Xie(谢品华)^1,3, Jun Duan(段俊)¹, Wu Fang(方武)¹, Liu-Yi Ling(凌六一)^1,4, Lan-Lan Shen(沈兰兰)¹, Jian-Guo Liu(刘建国)^1,3, Wen-Qing Liu(刘文清)^1,3

1. Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;
2. Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, China;
3. School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, China;
4. Institute of Electric and Information Technology, Anhui University of Science and Technology, Huainan 232001, China

Received:2015-07-22 Revised:2015-09-23 Online:2016-02-05 Published:2016-02-05
Contact: Min Qin E-mail:mqin@aiofm.ac.cn
Supported by:
Project supported by the "Strategic Priority Research Program" of the Chinese Academy of Sciences (Grant Nos. XDB05040200 and XDB05010500).

摘要/Abstract

摘要： NO₃ radicals accumulate during the night, thereby being the most critical night oxidant. Owing to the low concentration and dramatic variation, the detection of atmospheric NO₃ radicals is still challenging. In this paper, an LED-based Long Path Differential Optical Absorption Spectroscopy (LPDOAS) instrument is developed for measuring the atmospheric NO₃ radicals. This instrument is composed of a Schmidt-Cassegrain telescope, a combined emitting and receiving fiber, and a red LED equipped with a thermostat, and has a center wavelength of 660 nm, covering the NO₃ strongest absorption peak (662 nm). The influence of LED temperature fluctuations is discussed. The temperature of the LED lamp with a home-made thermostat is tested, showing a stability of ± 0.1 ℃. The principle and fitting analyses of LED-LPDOAS are presented. A retrieval example and a time series of NO₃ radical concentrations with good continuity for one night are shown. The detection limit of NO₃ for 2.6-km optical path is about 10 ppt.

关键词: DOAS system, NO₃ radical, red LED, fiber transceiver

Abstract: NO₃ radicals accumulate during the night, thereby being the most critical night oxidant. Owing to the low concentration and dramatic variation, the detection of atmospheric NO₃ radicals is still challenging. In this paper, an LED-based Long Path Differential Optical Absorption Spectroscopy (LPDOAS) instrument is developed for measuring the atmospheric NO₃ radicals. This instrument is composed of a Schmidt-Cassegrain telescope, a combined emitting and receiving fiber, and a red LED equipped with a thermostat, and has a center wavelength of 660 nm, covering the NO₃ strongest absorption peak (662 nm). The influence of LED temperature fluctuations is discussed. The temperature of the LED lamp with a home-made thermostat is tested, showing a stability of ± 0.1 ℃. The principle and fitting analyses of LED-LPDOAS are presented. A retrieval example and a time series of NO₃ radical concentrations with good continuity for one night are shown. The detection limit of NO₃ for 2.6-km optical path is about 10 ppt.

Key words: DOAS system, NO₃ radical, red LED, fiber transceiver

中图分类号: (Spectral absorption by atmospheric gases)

42.68.Ca

07.60.Rd (Visible and ultraviolet spectrometers) 07.60.Vg (Fiber-optic instruments) 07.88.+y (Instruments for environmental pollution measurements)

卢雪, 秦敏, 谢品华, 段俊, 方武, 凌六一, 沈兰兰, 刘建国, 刘文清. Measurements of atmospheric NO₃ radicals in Hefei using LED-based long path differential optical absorption spectroscopy[J]. 中国物理B, 2016, 25(2): 24210-024210.

Xue Lu(卢雪), Min Qin(秦敏), Pin-Hua Xie(谢品华), Jun Duan(段俊), Wu Fang(方武), Liu-Yi Ling(凌六一), Lan-Lan Shen(沈兰兰), Jian-Guo Liu(刘建国), Wen-Qing Liu(刘文清). Measurements of atmospheric NO₃ radicals in Hefei using LED-based long path differential optical absorption spectroscopy[J]. Chin. Phys. B, 2016, 25(2): 24210-024210.

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Measurements of atmospheric NO₃ radicals in Hefei using LED-based long path differential optical absorption spectroscopy

Measurements of atmospheric NO₃ radicals in Hefei using LED-based long path differential optical absorption spectroscopy

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