Journal of the Optical Society of Korea

Optical Society of Korea (한국광학회)
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Detection of Methane and Ethane by Continuous-Wave Cavity Ring-Down Spectroscopy Near 1.67 μm

  • Oh, Myoung-Kyu (Laser Spectroscopy Laboratory, Advanced Photonics Research Institute and School of Photon Science & Technology, GIST) ;
  • Lee, Yong-Hoon (Laser Spectroscopy Laboratory, Advanced Photonics Research Institute and School of Photon Science & Technology, GIST) ;
  • Choi, Sung-Chul (Laser Spectroscopy Laboratory, Advanced Photonics Research Institute and School of Photon Science & Technology, GIST) ;
  • Ko, Do-Kyeong (Laser Spectroscopy Laboratory, Advanced Photonics Research Institute and School of Photon Science & Technology, GIST) ;
  • Lee, Jong-Min (Laser Spectroscopy Laboratory, Advanced Photonics Research Institute and School of Photon Science & Technology, GIST)
  • Received : 2007.11.26
  • Published : 2008.03.25
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Abstract

We report the simple detection method of the small hydrocarbons, methane and ethane, by continuous-wave cavity ring-down spectroscopy near 1.67 ${\mu}m$ using an external cavity diode laser. The absorption lines of methane between 6002.48 $cm^{-1}$ and 6003.37 $cm^{-1}$ and ethane between 5955.65 $cm^{-1}$ and 5956.4 $cm^{-1}$ have been resolved and employed for the gas detection. The largest absorption cross sections were found to be 6.5$\times10^{-20}cm^2$ and 7.4$\times10^{-21}cm^2$ for methane and ethane, respectively, in each spectral range. The minimum detectable absorption limit of our spectrometer was 4.8${\times}10^{-9}cm^{-1}$/$\sqrt{Hz}$, which corresponds to the detection limits of 3 ppb/$\sqrt{Hz}$ and 27 ppb/$\sqrt{Hz}$ for methane and ethane, respectively. The near-IR continuous-wave cavity ring-down spectroscopic detection method of the small hydrocarbons can be applied for medical diagnosis and environmental monitoring as a fast and convenient method.

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References

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