Spectroscopic trace-gas sensor with rapidly scanned wavelengths of a pulsed quantum cascade laser for in situ NO monitoring of industrial exhaust systems

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

Research output: Contribution to journalArticle

70 Scopus citations

Abstract

Development of a pulsed quantum cascade laser (QCL)-based spectroscopic trace-gas sensor for sub-part-per-million detection of nitric oxide (NO) and capable of monitoring other molecular species such as CO2, H 2O, and NH3 in industrial combustion exhaust systems is reported. Rapid frequency modulation is applied to the QCL to minimize the influence of fluctuating non-selective absorption. A novel method utilizes only a few laser pulses within a single wavelength scan to probe an absorption spectrum at precisely selected optical frequencies. A high-temperature gas cell was used for laboratory evaluation of the NO sensor performance. A noise-equivalent sensitivity (1σ) of ∼ 100 ppb × m/ √Hz at room temperature and ∼ 200 ppb × m/ √Hz at 630 K was achieved by measuring the NO R(6.5) absorption doublet at 1900.075 cm-1.

Original languageEnglish (US)
Pages (from-to)617-625
Number of pages9
JournalApplied Physics B: Lasers and Optics
Volume80
Issue number4-5
DOIs
StatePublished - Apr 1 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

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