Applied Physics B

, Volume 100, Issue 3, pp 627–635

QEPAS spectrophones: design, optimization, and performance

  • L. Dong
  • A. A. Kosterev
  • D. Thomazy
  • F. K. Tittel
Article

Abstract

The impact of design parameters of a spectrophone for quartz-enhanced photoacoustic spectroscopy on its performance was investigated. The microresonator of spectrophone is optimized based on an experimental study. The results show that a 4.4 mm-long tube with 0.6 mm inner diameter yields the highest signal-to-noise ratio, which is ∼30 times higher than that of a bare QTF at gas pressures between 400 and 800 Torr. The optimized configuration demonstrates a normalized noise-equivalent absorption coefficient (1σ) of 3.3×10−9 cm−1W/Hz1/2 for C2H2 detection at atmospheric pressure. The effect of the changing carrier gas composition is studied. A side-by-side sensitivity comparison between QEPAS and conventional photoacoustic spectroscopy technique is reported.

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • L. Dong
    • 1
  • A. A. Kosterev
    • 1
  • D. Thomazy
    • 1
  • F. K. Tittel
    • 1
  1. 1.Electrical and Computer Engineering DepartmentRice UniversityHoustonUSA

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