Abstract

A diode laser sensor has been applied to monitor CO, CO2, and CH4 in combustion gases with absorption spectroscopy and fast extraction-sampling techniques. Survey spectra of the CO 3ν band (R branch) and the 2ν1 + 2ν20 + ν3 CO2 band (R branch) near 6350 cm−1 and H2O lines from the ν1 + 2ν2 and 2ν2 + ν3 bands in the spectral region from 6345 to 6660 cm−1 were recorded and compared with calculated spectra (from the HITRAN 96 database) to select optimum transitions for species detection. Species concentrations above a laminar, premixed, methane–air flame were determined from measured absorption in a fast-flow multipass absorption cell containing probe-sampled combustion gases; good agreement was found with calculated chemical equilibrium values.

© 1997 Optical Society of America

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