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The analysis of CO2 absorption spectrum characteristics near 1.58 μm at high pressures

Lü Xiao-Jing Weng Chun-Sheng Li Ning

The analysis of CO2 absorption spectrum characteristics near 1.58 μm at high pressures

Lü Xiao-Jing, Weng Chun-Sheng, Li Ning
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  • Abstract views:  3732
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  • Received Date:  15 March 2012
  • Accepted Date:  02 May 2012
  • Published Online:  05 December 2012

The analysis of CO2 absorption spectrum characteristics near 1.58 μm at high pressures

  • 1. National Key Laboratory of Transient Physics, NJUST, Nanjing 210094, China
Fund Project:  Project supported by the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 11002074), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant Nos. 20093219110037, 20113219120045), the Postdoctoral Science Foundation of China (Grant No. 20100481147), and Jiangsu Planned Projects for Postdoctoral Research Funds, China (Grant No. 0902094C).

Abstract: The study of gas spectrum characteristics at high pressure is the foundation for tunable diode absorption spectroscopy technique used in pulsed detonation engines and other high-pressure combustion environments. To understand variations of gas spectrum characteristics with pressure, especially the absorption spectrum characteristics at high pressures, gas absorption spectrum characteristics at high pressure are studied by tunable diode laser absorption spectroscopy in this paper, a method to calculate gas concentration at high pressure is also presented. Within a pressure range of 1-10.13×105 Pa, CO2 absorption spectrum in a near-infrared band of 1.58 μm is simulated. Gas online measurement at high pressure is set up. The CO2 absorption spectrum is measured by a direct absorption method near 1578.0-1579.7 nm. The concentration at high-pressure environment is calculated by linear fitting method and compared with theoretical absorption spectrum. The results show that the absorption spectrum obtained experimentally is in good agreement with simulations result. In high-pressure environment, maximum error of linear fitting method to calculate gas concentration at high pressure is 5.5%, and the average error is 2.6%.

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