| DOI | Resolve DOI: https://doi.org/10.1016/j.jqsrt.2013.08.022 |
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| Author | Search for: Yon, J.; Search for: Liu, F.1; Search for: Bescond, A.; Search for: Caumont-Prim, C.; Search for: Rozé, C.; Search for: Ouf, F.-X.; Search for: Coppalle, A. |
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| Affiliation | - National Research Council of Canada. Measurement Science and Standards
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| Format | Text, Article |
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| Subject | Absorption 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 |
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| Abstract | The 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. |
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| Publication date | 2014 |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 21270843 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 4e623d73-6f2b-476c-9609-39559c059650 |
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| Record created | 2014-02-17 |
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| Record modified | 2020-04-22 |
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