Spatially resolved measurements of soot volume fraction using laser-induced incandescence

B. Quay, T. W. Lee, T. Ni, R. J. Santoro

    Research output: Contribution to journalArticlepeer-review

    257 Scopus citations

    Abstract

    Laser-induced incandescence is used to obtain spatially resolved measurements of soot volume fraction in a laminar diffusion flame, in which comparisons with laser scattering/extinction data yield excellent agreement. In addition, the laser-induced incandescence signal is observed to involve a rapid rise in intensity followed by a relatively long (ca. 600 ns) decay period subsequent to the laser pulse, while the effect of laser fluence is manifest in nonlinear and near-saturated response of the laser-induced incandescence signal with the transition occurring at a laser fluence of approximately 1.2 × 108 W/cm2. Spectral response of the laser-induced incandescence involves a continuous spectrum in the visible wavelength range due to the blackbody nature of the emission. Simultaneous measurements of laser-induced incandescence and light scattering yield encouraging results concerning the mean soot particle diameter and number concentration. Thus, laser-induced incandescence can be used as an instantaneous, spatially resolved diagnostic of soot volume fraction without the need for the conventional line-of-sight laser extinction method, while potential applications in two-dimensional imaging and simultaneous measurements of laser-induced incandescence and light-scattering to generate a complete soot property characterization are significant.

    Original languageEnglish (US)
    Pages (from-to)384-392
    Number of pages9
    JournalCombustion and Flame
    Volume97
    Issue number3-4
    DOIs
    StatePublished - Jun 1994

    All Science Journal Classification (ASJC) codes

    • General Chemistry
    • General Chemical Engineering
    • Fuel Technology
    • Energy Engineering and Power Technology
    • General Physics and Astronomy

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