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. 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. 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: 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)