Methodology for detection of carbon monoxide in hot, humid media by telecommunication distributed feedback laser-based tunable diode laser absorption spectrometry

摘要

Detection of carbon monoxide (CO) in combustion gases by tunable diode laser spectrometry is often hampered by spectral interferences from H_(2)O and 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 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 line-shape function, percent-level concentrations of CO can be detected in media with tens of percent of water (c_(H_(2)O) <= 40percent) at T <= 1000 deg C with an accuracy of a few percent by the use of a single reference water spectrum for background correction.