Abstract
A method for simultaneous measurements of fluorescence lifetimes of two species along a line is described. The experimental setup is based on picosecond laser pulses from two tunable optical parametric generator/optical parametric amplifier systems together with a streak camera. With an appropriate optical time delay between the two laser pulses, whose wavelengths are tuned to excite two different species, laser-induced fluorescence can be both detected temporally and spatially resolved by the streak camera. Hence, our method enables one-dimensional imaging of fluorescence lifetimes of two species in the same streak camera recording. The concept is demonstrated for fluorescence lifetime measurements of CO and OH in a laminar methane/air flame on a Bunsen-type burner. Measurements were taken in flames with four different equivalence ratios, namely ϕ = 0.9, 1.0, 1.15, and 1.25. The measured one-dimensional lifetime profiles generally agree well with lifetimes calculated from quenching cross sections found in the literature and quencher concentrations predicted by the GRI 3.0 mechanism. For OH, there is a systematic deviation of approximately 30 % between calculated and measured lifetimes. It is found that this is mainly due to the adiabatic assumption regarding the flame and uncertainty in H2O quenching cross section. This emphasizes the strength of measuring the quenching rates rather than relying on models. The measurement concept might be useful for single-shot measurements of fluorescence lifetimes of several species pairs of vital importance in combustion processes, hence allowing fluorescence signals to be corrected for quenching and ultimately yield quantitative concentration profiles.
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The present work has been financed by DALDECS, an Advanced Grant from the European Research Council (ERC), and supported by Centre for Combustion Science and Technology (CECOST) through the Swedish Energy Agency (Energimyndigheten) and the Swedish Foundation for Strategic Research (SSF).
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Jonsson, M., Ehn, A., Christensen, M. et al. Simultaneous one-dimensional fluorescence lifetime measurements of OH and CO in premixed flames. Appl. Phys. B 115, 35–43 (2014). https://doi.org/10.1007/s00340-013-5570-7
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DOI: https://doi.org/10.1007/s00340-013-5570-7