Abstract
Preliminary analytical and experimental results are presented which address the feasibility of infrared planar laser-induced fluorescence (IR PLIF), in which a tunable infrared source is used to excite vibrational transitions in molecules, with collection of vibrational fluorescence by an infrared camera. Issues relating to the detectability of infrared PLIF are addressed, including detection schemes, candidate species, energy transfer mechanisms, fluorescence quantum yield modeling, and detection limits. Specific attention is given to carbon monoxide (CO), which is more easily modeled and discussed due to its straightforward spectroscopy and energy transfer mechanisms, although polyatomics have the potential to provide stronger absorption and emission. To demonstrate the technique, a preliminary visualization of CO-air mixing at 300 K is shown, in which CO mole fractions as low as 1% can be distinguished. Potential for use of IR PLIF for other species and at higher temperatures is also discussed.
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