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Simultaneous Two-Dimensional Visualization of Soot and OH in Flames Using Laser-Induced Fluorescence

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Abstract:

Two-dimensional visualization of soot has been realized in flames with the use of laser-induced fluorescence in C2 from laser-vaporized soot [LIF(C2)LVS]. Soot particles are heated to vaporization temperatures by the absorption of laser radiation. C2 radicals produced by this process are excited at wavelengths around 563 nm through the transition v' = 0 d 3Πgv" = 1 a 3Πu and the subsequent fluorescence at ∼516 nm is detected. By frequency-doubling of the laser radiation, wavelengths around 281.5 nm are achieved, which can excite OH radicals to the v' = 1 A2Σ+ state from v" = 0 X2Π, with subsequent fluorescence at ∼310 nm. With the use of both these excitation wavelengths, and a Cassegrainian split-mirror telescope as the imaging detection system in front of the charge-coupled device (CCD) camera, simultaneous two-dimensional single-shot images of soot and OH were obtained on a single CCD chip, thus enabling both sooting regions and reaction zones in flames to be monitored.

Keywords: 2-D visualization; Combustion; Laser diagnostics; Laser-induced fluorescence; Soot

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702963905132

Affiliations: Department of Combustion Physics, Lund Institute of Technology, P.O. Box 118, S-221 00 Lund, Sweden

Publication date: September 1, 1996

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