中国物理B ›› 2012, Vol. 21 ›› Issue (11): 119301-119301.doi: 10.1088/1674-1056/21/11/119301

• GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS • 上一篇    

Comparing different light-emitting diodes as light sources for long path differential optical absorption spectroscopy NO2 and SO2 measurements

陈嘉乐a b, 凌六一a, Andreas Hartlb, 郑尼娜a, Gerrit Kuhlmannb, 秦敏a, 孙友文a, 谢品华a, 刘文清a, Mark Wenigb   

  1. a Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;
    b School of Energy and Environment, City University of Hong Kong, Hong Kong, China
  • 收稿日期:2012-03-30 修回日期:2012-05-23 出版日期:2012-10-01 发布日期:2012-10-01
  • 基金资助:
    Project supported by the National High-Technology Research and Development Program of China (Grant No. 2009AA063006) and the National Natural Science Foundation of China (Grant No. 60808034).

Comparing different light-emitting diodes as light sources for long path differential optical absorption spectroscopy NO2 and SO2 measurements

Chan Ka-Lok (陈嘉乐)a b, Ling Liu-Yi (凌六一)a, Andreas Hartlb, Zheng Ni-Na (郑尼娜)a, Gerrit Kuhlmannb, Qin Min (秦敏)a, Sun You-Wen (孙友文)a, Xie Pin-Hua (谢品华)a, Liu Wen-Qing (刘文清)a, Mark Wenigb   

  1. a Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;
    b School of Energy and Environment, City University of Hong Kong, Hong Kong, China
  • Received:2012-03-30 Revised:2012-05-23 Online:2012-10-01 Published:2012-10-01
  • Contact: Xie Pin-Hua E-mail:phxie@aiofm.ac.cn
  • Supported by:
    Project supported by the National High-Technology Research and Development Program of China (Grant No. 2009AA063006) and the National Natural Science Foundation of China (Grant No. 60808034).

摘要: In this paper, we present the comparison of different light-emitting diodes (LEDs) as the light source for long path differential optical absorption spectroscopy (LP-DOAS) atmospheric trace gas measurements. In our study, we use a fiber optic design, where high power LEDs used as the light source are coupled into the telescope using a Y shape fiber bundle. Two blue and a ultraviolet (UV) LEDs with different emission wavelength ranges are tested for NO2 and SO2 measurements. The detailed description of the instrumental setup, the NO2 and SO2 retrieval procedure, the error analysis, and the preliminary results from the measurements carried out in Science Island, Hefei, Anhui, China are presented. Our first measurement results show that atmospheric NO2 and SO2 have strong temporal variations in that area and that the measurement accuracy is strongly dependent on the visibility conditions. The measured NO2 and SO2 data are compared to the Ozone Monitoring Instrument (OMI) satellite observations. The results show that the OMI NO2 product underestimates the ground level NO2 by 45%, while the OMI SO2 data are highly influenced by clouds and aerosols, which can lead to large biases in the ground level concentrations. During the experiment, the mixing ratios of the atmospheric NO2 and SO2 vary from 8 ppbv to 36 ppbv and from 3 ppbv to 18 ppbv, respectively.

关键词: light-emitting diode, fiber optic designed telescope, NO2 measurement, SO2 measurement

Abstract: In this paper, we present the comparison of different light-emitting diodes (LEDs) as the light source for long path differential optical absorption spectroscopy (LP-DOAS) atmospheric trace gas measurements. In our study, we use a fiber optic design, where high power LEDs used as the light source are coupled into the telescope using a Y shape fiber bundle. Two blue and a ultraviolet (UV) LEDs with different emission wavelength ranges are tested for NO2 and SO2 measurements. The detailed description of the instrumental setup, the NO2 and SO2 retrieval procedure, the error analysis, and the preliminary results from the measurements carried out in Science Island, Hefei, Anhui, China are presented. Our first measurement results show that atmospheric NO2 and SO2 have strong temporal variations in that area and that the measurement accuracy is strongly dependent on the visibility conditions. The measured NO2 and SO2 data are compared to the Ozone Monitoring Instrument (OMI) satellite observations. The results show that the OMI NO2 product underestimates the ground level NO2 by 45%, while the OMI SO2 data are highly influenced by clouds and aerosols, which can lead to large biases in the ground level concentrations. During the experiment, the mixing ratios of the atmospheric NO2 and SO2 vary from 8 ppbv to 36 ppbv and from 3 ppbv to 18 ppbv, respectively.

Key words: light-emitting diode, fiber optic designed telescope, NO2 measurement, SO2 measurement

中图分类号:  (Other topics in geophysical observations, instrumentation, and techniques)

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