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

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

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.

Keywords: DOAS system NO₃ radical red LED fiber transceiver

Received: 22 July 2015
Revised: 23 September 2015
Accepted manuscript online:

PACS:	42.68.Ca	(Spectral absorption by atmospheric gases)
	07.60.Rd	(Visible and ultraviolet spectrometers)
	07.60.Vg	(Fiber-optic instruments)
	07.88.+y	(Instruments for environmental pollution measurements)

Fund: Project supported by the "Strategic Priority Research Program" of the Chinese Academy of Sciences (Grant Nos. XDB05040200 and XDB05010500).

Corresponding Authors: Min Qin
E-mail: mqin@aiofm.ac.cn

Cite this article:

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 2016 Chin. Phys. B 25 024210

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

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