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Optimization of SGSF parameters in DOAS measurement using supercontinuum source

HE XU1, CHENGHAI ZHAO2, WUMING WU1,3,4, SHENGPING CHEN1,3,4,* , ZONGFU JIANG1,5,4

Affiliation

  1. College of Advanced Interdisciplinary studies, National University of Defense Technology, Changsha 410073, China
  2. College of Science, Central South University of Forestry and Technology, Changsha Hunan 410004, P.R China
  3. State Key Laboratory of Pulsed Power Laser Technology, Changsha, Hunan 410073, China
  4. Hunan Provincial Key Laboratory of High Energy Laser Technology, Changsha, Hunan 410073, China
  5. State Key Laboratory of Pulsed Power Laser Technology, Changsha, Hunan 410073, ChinaHunan Provincial Key Laboratory of High Energy Laser Technology, Changsha, Hunan 410073, China

Abstract

The average concentrations of water vapor (H2O) and carbon dioxide (CO2) in the near-surface atmosphere are measured by adopting a differential optical absorption spectroscopy (DOAS) system, which uses a fiber supercontinuum source (SC) with the method of Savitzky-Golay smoothing filter (SGSF). Combining the SGSF working mechanism and the absorption features of H2O and CO2 together, a higher measured precision can be achieved by optimizing the SGSF parameters (window numbers and ranks) with a nearly linear relationship. Furthermore, it is indicated that a higher rank and a lower window number are more precise for measuring the gas with strong absorption. Finally, on the basis of the area rule, the concentrations of CO2 and H2O are calculated as 479.3 ppm and 7425.4 ppm separately, which are consistent with the detected results with the relative error of 0.46% and 0.14%..

Keywords

Supercontinuum, DOAS, Measurement, Savitzky-Golay smoothing filter (SGSF).

Citation

HE XU, CHENGHAI ZHAO, WUMING WU, SHENGPING CHEN, ZONGFU JIANG, Optimization of SGSF parameters in DOAS measurement using supercontinuum source, Optoelectronics and Advanced Materials - Rapid Communications, 13, 3-4, March-April 2019, pp.182-187 (2019).

Submitted at: Sept. 10, 2018

Accepted at: April 8, 2019