Laser-induced fluorescence detection of NO in high-pressure flames with A-X(0,0), (0,1), and (0,2) excitation
Laser-induced fluorescence (LIF) techniques using excitation in the A-X and D-X electronic systems have proven a reliable technique for two-dimensional imaging of nitric oxide concentrations in practical combustion systems. However, at pressures above 10 atmospheres, attenuation of the excitation laser in the hot combustion gases and interference from molecular oxygen LIF causes significant problems for NO LIF. We compare here strategies for NO LIF detection exciting selected transitions in the A-X (0,0), (0,1), and (0,2) bands. We report measurements in laminar premixed methane/air flames at pressures between 1 and 60 bar, and based on these results, we discuss the advantages and problems of these three excitation strategies.
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