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Experimental assessment of O2 interferences on laser-induced fluorescence measurements of NO in high-pressure, lean premixed flames by use of narrow-band and broadband detection

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Abstract

We experimentally investigate the influence of O2 interferences on laser-induced fluorescence measurements of NO in lean methane-fueled flames at a range of pressures for both narrow-band and broadband fluorescence detection. We identify NO excitation schemes that minimize O2 interferences. From detection scans we obtain interference spectra for the different NO excitation schemes. We then identify optimum excitation–detection schemes for narrow-band detection measurements of NO. To simulate broadband detection experiments, we numerically apply five different filter combinations to the experimentally obtained detection scans. We develop filter-assessment parameters to judge the effectiveness of the different filtering schemes, and we establish a methodology for evaluating broadband excitation–detection strategies. From this research we identify optimum excitation–detection schemes for broadband detection measurements of NO.

© 1996 Optical Society of America

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