Mid-infrared trace gas analysis with single-pass fourier transform infrared hollow waveguide gas sensors

Seong Soo Kim, Nicola Menegazzo, Christina Young, James W Chan, Chance Carter, Boris Mizaikoff

Research output: Contribution to journalArticle

32 Scopus citations

Abstract

A hollow core optical fiber gas sensor has been developed in combination with a Fourier transform infrared (FT-IR) spectrometer operating in the spectral range of 4000-500 cm -1, enabling continuous detection of small volume gas-phase analytes such as CH 4, CO 2, C 2H 5CI, or their mixtures at trace levels. Ag/Ag-halide hollow core optical fibers simultaneously serve as an optical waveguide for broad-band mid-infrared radiation and as a miniaturized absorption gas cell. Specifically, carbon dioxide, methane, and ethyl chloride as well as binary mixtures in a carrier gas were analyzed during exponential dilution experiments. In the studies reported here, the integration of an optical gas sensor with FT-IR spectroscopy provides excellent detection limits for small gas volumes (∼1.5 mL) of individual analytes at a few tens of parts per billion (ppb, vol/vol) for carbon dioxide and a few hundreds of ppb (vol/vol) for methane. Furthermore, the broad-band nature of the radiation source and of the hollow core optical waveguide provides the capability of multi-constituent analysis in mixtures.

Original languageEnglish (US)
Pages (from-to)331-337
Number of pages7
JournalApplied Spectroscopy
Volume63
Issue number3
DOIs
StatePublished - Mar 2009
Externally publishedYes

Keywords

  • Carbon dioxide
  • Fourier transform infrared spectroscopy
  • FT-IR spectroscopy
  • Hollow waveguides
  • Methane
  • Mid-infrared sensors
  • Trace gas sensing

ASJC Scopus subject areas

  • Spectroscopy
  • Instrumentation

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