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Measuring the Concentration of Minor Species from the Modulation Dip of the Nonresonant Background of Broad-Band CARS Spectra

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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 CH4/air premixed flame of a counterflow burner.

Keywords: CARS; Concentration measurement; Flame spectroscopy; Raman spectroscopy; Spectroscopic techniques

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702934067009

Affiliations: 1: Plasma Laboratory, Korea Research Institute of Standards and Science, P.O. Box 3, Taedok Science Town, Taejon, 305-606, Korea 2: Department of Mechanical Engineering, Seoul National University, Seoul 151-742, Korea 3: Department of Chemistry, Dankook University, Seoul 140-714, Korea

Publication date: June 1, 1993

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