Abstract
Spectrally resolved laser-induced fluorescence (LIF) with one-dimensional spatial imaging was investigated as a technique for detection of trace concentrations of nitric oxide (NO) in high-pressure flames. Experiments were performed in the burnt gases of premixed methane/argon/oxygen flames with seeded NO (15 to 50 ppm), pressures of 10 to 60 bar, and an equivalence ratio of 0.9. LIF signals were dispersed with a spectrometer and recorded on a 2-D intensified CCD array yielding both spectral resolution and 1-D spatial resolution. This method allows isolation of NO-LIF from interference signals due to alternative species (mainly hot O2 and CO2) while providing spatial resolution along the line of the excitation laser. A fast data analysis strategy was developed to enable pulse-by-pulse NO concentration measurements from these images. Statistical analyses as a function of laser energy of these single-shot data were used to determine the detection limits for NO concentration as well as the measurement precision. Extrapolating these results to pulse energies of ∼ 16 mJ/pulse yielded a predicted detection limit of ∼ 10 ppm for pressures up to 60 bar. Quantitative 1-D LIF measurements were performed in CH4/air flames to validate capability for detection of nascent NO in flames at 10–60 bar.
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42.62.Fi; 42.30.Va; 47.70.Pq; 07.35.+k; 39.30.+w
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Yoo, J., Lee, T., Jeffries, J. et al. Detection of trace nitric oxide concentrations using 1-D laser-induced fluorescence imaging. Appl. Phys. B 91, 661–667 (2008). https://doi.org/10.1007/s00340-008-3030-6
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DOI: https://doi.org/10.1007/s00340-008-3030-6