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Measurement of soot morphology by integrated LII and elastic light scattering

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Abstract

A compact experimental setup that integrates laser-induced incandescence (LII) and one-angle elastic light scattering (1A-ELS) to measure the size of polydisperse soot aggregates is described. A 532 nm laser and a detection angle of 35 degrees were employed, which provided sensitivity for aggregate radius of gyrations (R g) of R g≤200 nm. Both lognormal and self-preserving distribution functions are compared with width parameters derived from both aggregation theory and transmission electron microscopy (TEM) measurements. Using these distributions, mean aggregate sizes derived from the scattering measurements are compared. The LII+1A-ELS technique is validated with a two-angle elastic light scattering (2A-ELS) approach with an additional detection angle at 145 deg. Unlike LII+1A-ELS, the 2A-ELS technique has the advantage of not requiring knowledge of soot optical properties. Good agreement is found between the two techniques for a given distribution. A fundamental discrepancy exists between distributions derived from TEM and those according to aggregation theory, limiting the accuracy of both 2A-ELS and LII+1A-ELS. The dependence of both techniques on laser fluence and hence soot temperature is examined and discussed.

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Authors and Affiliations

  1. Institute for Chemical Process and Environmental Technology, National Research Council of Canada, 1200 Montreal Road, Ottawa, Ontario, K1A 0R6, Canada

    D. R. Snelling, O. Link, K. A. Thomson & G. J. Smallwood

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  1. D. R. Snelling
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  2. O. Link
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  3. K. A. Thomson
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  4. G. J. Smallwood
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Correspondence to D. R. Snelling.

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Snelling, D.R., Link, O., Thomson, K.A. et al. Measurement of soot morphology by integrated LII and elastic light scattering. Appl. Phys. B 104, 385–397 (2011). https://doi.org/10.1007/s00340-011-4394-6

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  • DOI: https://doi.org/10.1007/s00340-011-4394-6

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