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Tunable diode laser and Fourier transform spectroscopy of low pressure premixed flames

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Abstract

Tunable diode laser and FT-IR spectroscopies are used to obtain spatially resolved species and temperature profiles in a low pressure premixed CH4/N2O flame. Vibrational temperatures are obtained from integrated absorbences measured with a diode laser. Rotational temperatures are obtained by fitting peak absorbences from fundamental and overtone bands of CO measured with a FT-IR spectrometer to a Boltzmann-type population distribution. Species profiles for CO and NO in the flame are obtained from diode laser spectra as a function of mixing ratio and burner chamber pressure. Experimentally determined species’ profiles are compared with computer-generated species’ profiles. Finally, the utility of crossed diode laser and interferometer output beams for flame diagnostics is discussed.

© 1991 Optical Society of America

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