Effects of multiple scattering on radiative properties of soot fractal aggregates

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DOIResolve DOI: http://doi.org/10.1016/j.jqsrt.2013.08.022
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TypeArticle
Journal titleJournal of Quantitative Spectroscopy and Radiative Transfer
ISSN0022-4073
Volume133
Pages374381; # of pages: 8
SubjectAbsorption measurements; Discrete dipole approximation; Extinction measurements; FRactal aggregate; GMM; Laser induced incandescence; Optical characterization; RDG-FA; Digital differential analyzers; Fractal dimension; Light scattering; Multiple scattering; Soot; Aggregates; fractal analysis; light scattering; measurement method; radiative transfer; soot
AbstractThe in situ optical characterization of smokes composed of soot particles relies on light extinction, angular static light scattering (SLS), or laser induced incandescence (LII). These measurements are usually interpreted by using the Rayleigh-Debye-Gans theory for Fractal Aggregates (RDG-FA). RDG-FA is simple to use but it completely neglects the impact of multiple scattering (MS) within soot aggregates. In this paper, based on a scaling approach that takes into account MS effects, an extended form of the RDG-FA theory is proposed in order to take into account these effects. The parameters of this extended theory and their dependency on the number of primary sphere inside the aggregate (1 < N p < 1006) and on the wavelength (266 nm < λ < 1064 nm) are evaluated thanks to rigorous calculations based on discrete dipole approximation (DDA) and generalized multi-sphere Mie-solution (GMM) calculations. This study shows that size determination by SLS is not distorted by MS effect. On the contrary, it is shown that fractal dimension can be misinterpreted by light scattering experiments, especially at short wavelengths. MS effects should be taken into account for the interpretation of absorption measurements that are involved in LII or extinction measurements. © 2013 Elsevier Ltd.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Measurement Science and Standards (MSS-SME)
Peer reviewedYes
NPARC number21270843
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Record identifier4e623d73-6f2b-476c-9609-39559c059650
Record created2014-02-17
Record modified2016-05-09
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