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Influence of rapid laser heating on the optical properties of in-flame soot

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Abstract

To understand the effect of rapid heating on the optical properties of in-flame soot and its potential influence on the laser-induced incandescence (LII) signal, the time-resolved extinction coefficient of soot is measured in diffusion and premixed flames during laser heating. Heating is performed using a 1064-nm pulsed laser with fluences ranging from 0.2 to 6.2 mJ/mm2. Extinction measurements are carried out using continuous-wave lasers at four different wavelengths. A rapid enhancement of extinction, by up to 10 % in the diffusion flame and 18 % in the premixed flame, occurs during laser heating most likely as a result of temperature-dependent optical properties and laser-induced thermal annealing of soot. The thermal expansion of flame gases causes a gradual decline of soot concentration for about 2 μs after the laser pulse. Significant loss of soot material by sublimation is observed at fluences as low as 1.03 and 2.06 mJ/mm2 for the diffusion and premixed flames, respectively. A secondary rise in extinction coefficient is observed from about 50 to 800 ns after the laser pulse at low monitoring wavelengths, attributed to the formation of light-absorbing gaseous species from the sublimated soot material. These effects may impact the LII signal and should be accounted for in LII analysis.

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Acknowledgments

The authors acknowledge the support of a Helmholtz/NRC collaborative partnership which made this research possible.

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Authors and Affiliations

  1. National Research Council Canada, 1200 Montreal Road, Ottawa, K1A 0R6, Canada

    M. Saffaripour, D. R. Snelling, G. J. Smallwood & K. A. Thomson

  2. German Aerospace Centre (DLR), Pfaffenwaldring 38-40, 70569, Stuttgart, Germany

    K.-P. Geigle

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  1. M. Saffaripour
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  2. K.-P. Geigle
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  3. D. R. Snelling
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  4. G. J. Smallwood
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Correspondence to K. A. Thomson.

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Saffaripour, M., Geigle, KP., Snelling, D.R. et al. Influence of rapid laser heating on the optical properties of in-flame soot. Appl. Phys. B 119, 621–642 (2015). https://doi.org/10.1007/s00340-015-6072-6

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