Influence of molecular relaxation dynamics on quartz-enhanced photoacoustic detection of CO2 at λ =2 μm

Gerard Wysocki, A. A. Kosterev, F. K. Tittel

Research output: Contribution to journalArticle

88 Scopus citations

Abstract

Carbon dioxide (CO2) trace gas detection based on quartz enhanced photoacoustic spectroscopy (QEPAS) using a distributed feedback diode laser operating at λ=2 μm is performed, with a primary purpose of studying vibrational relaxation processes in the CO2-N 2-H2O system. A simple model is developed and used to explain the experimentally observed dependence of amplitude and phase of the photoacoustic signal on pressure and gas humidity. A (1σ) sensitivity of 110 parts-per-million (with a 1 s lock-in time constant) was obtained for CO2 concentrations measured in humid gas samples.

Original languageEnglish (US)
Pages (from-to)301-306
Number of pages6
JournalApplied Physics B: Lasers and Optics
Volume85
Issue number2-3
DOIs
StatePublished - Nov 1 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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