Abstract
A comparative study has been performed in order to quantify the signal-to-background ratio of Raman measurements in fuel-richflames using pulsed laser radiation at 532, 489, 355 and 266 nm.For the comparison, spectra were recorded in stablepremixed, sooting and non-sooting C2H4/air flameswith equivalence ratios of ϕ = 1.58, 1.92 and 2.0. Thespectra show that the background, consisting mainly of laser-induced emissions from polycyclic aromatic hydrocarbonsand from C2 radicals, changes significantly with the laserwavelength. Although the Raman cross sections increase atshorter wavelength the signal-to-background ratio in the flamesinvestigated is clearly the best for λ = 532 nm and theworst for λ = 266 nm. The presented results show thepotential and limitations of concentration measurements by laser Raman scattering in fuel-rich flames and are a valuableaid for the decision of what laser system should be used formeasurements in laboratory or practical flames.
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