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Volume 43 Issue 11
Nov.  2017
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Journal of Beijing University of Aeronautics and Astronautics  > 2017  >  43(11): 2187-2192.
YANG Yang, LIU Chang, XU Lijunet al. Gas concentration measurement method based on WMS main peak spectrum fitting[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(11): 2187-2192. doi: 10.13700/j.bh.1001-5965.2017.0045(in Chinese)
Citation: YANG Yang, LIU Chang, XU Lijunet al. Gas concentration measurement method based on WMS main peak spectrum fitting[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(11): 2187-2192. doi: 10.13700/j.bh.1001-5965.2017.0045(in Chinese)
shu

Gas concentration measurement method based on WMS main peak spectrum fitting

doi: 10.13700/j.bh.1001-5965.2017.0045
  • 1.

    Large Aircraft Advanced Training Class, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

  • 2.

    School of Instrumentation Science and Opto-electronics Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

Funds:

National Natural Science Foundation of China 61225006

National Natural Science Foundation of China 61327011

National Natural Science Foundation of China 61370016

National Natural Science Foundation of China 61522102

More Information
  • Corresponding author: XU Lijun, E-mail: lijunxu@cqjj8.com
  • Received Date: 24 Jan 2017
  • Accepted Date: 24 Feb 2017
  • Publish Date: 20 Nov 2017
    Abstract

  • A fast and accurate gas concentration measurement method by fitting the main peak of the absorption spectrum harmonic signal is proposed for the first time to significantly improve the speed and accuracy of gas concentration measurement by laser wavelength modulation spectroscopy (WMS). In the proposed method, only the main peak of the absorption spectrum harmonic signal is scanned to obtain the peak value of the harmonic signal (WMS-2f/1f). This can greatly improve the scan speed due to the reduction of absorption spectrum scan range. Higher accuracy measurement can be achieved via fitting the main peak of the absorption spectrum harmonic signal (WMS-2f/1f) by a polynomial. The methods for choosing a suitable polynomial's degree and the influence of fitting data length on measurement result are discussed in this paper. The experimental results of carbon dioxide concentration measurement under different conditions validate the effectiveness of the proposed method.

     

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