A technique for rapid acquisition and computer processing of Raman signals is described for probing premixed laminar hydrocarbon-air flames using laser Raman spectroscopy. Temperatures can be determined to within ±50°K by fitting the observed N<sub>2</sub> spectrum at any point in the flame. Fits to the spectra of O<sub>2</sub>, CO, H<sub>2</sub>, and CO<sub>2</sub> are used to measure their mole fractions at the calculated N<sub>2</sub> temperature. For the remaining polyatomic species, the total area under the peak is the primary measure of their concentration.
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