Main > Chinese Optics Letters >  Volume 18 >  Issue 2 >  Page 021201 > Article
  • Abstract
  • Abstract
  • Figures (15)
  • Tables (0)
  • Equations (7)
  • References (17)
  • Get PDF
  • View Full Text
  • Paper Information
  • Received: Aug. 4, 2019

    Accepted: Nov. 7, 2019

    Posted: Jan. 7, 2020

    Published Online: Jan. 13, 2020

    The Author Email: Fei Wang (

    DOI: 10.3788/COL202018.021201

  • Get Citation
  • Copy Citation Text

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

    Download Citation

  • !Citations Alert
  • Category
  • Optical Sensing, Measurements, and Metrology
  • Share
Chinese Optics Letters, Vol. 18, Issue 2, 021201 (2020)

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

Jieshu Zou and Fei Wang*

Author Affiliations

  • State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China


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.


Please Enter Your Email: