Abstract

Two-dimensional visualization of soot has been realized in flames with the use of laser-induced fluorescence in C<sub>2</sub> from laser-vaporized soot [LIF(C<sub>2</sub>)LVS]. Soot particles are heated to vaporization temperatures by the absorption of laser radiation. C<sub>2</sub> radicals produced by this process are excited at wavelengths around 563 nm through the transition <i>v'</i> = 0 <i>d</i><sup>3</sup>&Pi;<sub>g</sub> ← <i>v"</i> = 1 <i>a</i><sup>3</sup>&Pi;<sub>u</sub> 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 <i>v'</i> = 1 A<sup>2</sup>&Sigma;<sup>+</sup> state from <i>v"</i> = 0 X<sup>2</sup>&Pi;, with subsequent fluorescence at &sim;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.

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