Compact QEPAS sensor for trace methane and ammonia detection in impure hydrogen

Abstract  
A compact two-gas sensor based on quartz-enhanced photoacoustic spectroscopy (QEPAS) was developed for trace methane and ammonia
quantification in impure hydrogen. The sensor is equipped with a micro-resonator to confine the sound wave and enhance QEPAS
signal. The normalized noise-equivalent absorption coefficients (1σ) of 2.45×10−8 cm−1 W/$\sqrt{}$Hz and 9.1×10−9 cm−1 W/$\sqrt{}$Hz for CH4 detection at 200 Torr and NH3 detection at 50 Torr were demonstrated with the QEPAS sensor configuration, respectively. The influence of water vapor on
the CH4 channel was also investigated.

  • Content Type Journal Article
  • Pages 1-9
  • DOI 10.1007/s00340-012-4908-x
  • Authors
    • L. Dong, Department of Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, TX 77005, USA
    • J. Wright, Hydrogen Technology Research Laboratory, Savannah River National Laboratory, Aiken, SC 29808, USA
    • B. Peters, Hydrogen Technology Research Laboratory, Savannah River National Laboratory, Aiken, SC 29808, USA
    • B. A. Ferguson, Hydrogen Technology Research Laboratory, Savannah River National Laboratory, Aiken, SC 29808, USA
    • F. K. Tittel, Department of Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, TX 77005, USA
    • S. McWhorter, Hydrogen Technology Research Laboratory, Savannah River National Laboratory, Aiken, SC 29808, USA

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