Measuring the concentration of minor species from the modulation dip of the nonresonant background of broad-band CARS spectra

J. W. Hahn*, S. N. Park, E. S. Lee, C. Rhee, K. T. Kang, Suk Ho Chung, C. Y. Choi, Y. D. Huh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

A new technique for measuring the concentration of species from the modulation dip of the nonresonant background of broad-band CARS spectra has been proposed. To reduce the mode noise superimposed on the CARS spectra, we used a modeless laser generating amplified spontaneous emission as the Stokes beam of the broad-band CARS. The modulation dip induced by a minor species, CO in Ar, was numerically calculated and fitted as a function of CO concentration and temperature. We applied this technique in measuring CO concentration in a static cell and also the profile of CO concentration in a CH 4 /air premixed flame of a counterflow burner.

Original languageEnglish (US)
Pages (from-to)710-714
Number of pages5
JournalApplied Spectroscopy
Volume47
Issue number6
DOIs
StatePublished - Dec 1 1993

Keywords

  • CARS
  • Concentration measurement
  • Flame spectroscopy
  • Raman spectroscopy
  • Spectroscopic techniques

ASJC Scopus subject areas

  • Instrumentation
  • Spectroscopy

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