Abstract

Detection of carbon monoxide (CO) in combustion gases by tunable diode laser spectrometry is often hampered by spectral interferences from ${\mathrm{H}}_2\mathrm{O}$ and ${\mathrm{CO}}_2$. A methodology for assessment of CO in hot, humid media using telecommunication distributed feedback lasers is presented. By addressing the R14 line at $6395.4{\mathrm{cm}}^{-1}$, and by using a dual-species-fitting technique that incorporates the fitting of both a previously measured water background reference spectrum and a $2f$-wavelength modulation lineshape function, percent-level concentrations of CO can be detected in media with tens of percent of water ($c_{{\mathrm{H}}_2\mathrm{O}}\le 40\%$) at $T\le 1000°\mathrm{C}$ with an accuracy of a few percent by the use of a single reference water spectrum for background correction.

© 2011 Optical Society of America

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