Measuring the Concentration of Minor Species from the Modulation Dip of the Nonresonant Background of Broad-Band CARS Spectra
| Autor: | Seung Nam Park, E. S. Lee, C. Y. Choi, Chunghi Rhee, Suk Ho Chung, J. W. Hahn, K. T. Kang, Y. D. Huh |
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| Rok vydání: | 1993 |
| Předmět: |
Premixed flame
Amplified spontaneous emission Chemistry 010401 analytical chemistry Analytical chemistry Laser 01 natural sciences Molecular physics Spectral line 0104 chemical sciences law.invention 010309 optics symbols.namesake Modulation law 0103 physical sciences symbols Spontaneous emission Raman spectroscopy Instrumentation Spectroscopy Noise (radio) |
| Zdroj: | Applied Spectroscopy. 47:710-714 |
| ISSN: | 1943-3530 0003-7028 |
| DOI: | 10.1366/0003702934067009 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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