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Characteristics of laser-induced incandescence from soot in studies of a time-dependent heat- and mass-transfer model

In English

Författare

Summary, in English

The temporal behavior of the laser-induced incandescence (LII) signal is often used for soot-particle sizing, which is possible because the cooling behavior of a laser-heated particle is dependent on the particle size. The heat- and mass-transfer model describing the temporal LII-signal behavior has in this work been extended to include the influence of the primary particle-size distribution and the spatial distribution of laser energy. When evaluating primary particle size, a monodisperse size distribution is often assumed, although it is well known that a polydisperse distribution is a better description of the real situation. In this work the impact of this assumption is investigated for Gaussian and lognormal size distributions of different widths, and the result is a significant bias towards larger particle sizes because of the higher influence of larger particles on the LII signal. Moreover, the dependence of the LII signal on the laser fluence is studied for different spatial distributions of the laser energy. The top-hat, Gaussian sheet and Gaussian beam distributions were tested and it is established that the LII signal is strongly dependent on the choice of distribution. However, in this case the influence of particle size is minor.

Publiceringsår

2004

Språk

Engelska

Sidor

241-248

Publikation/Tidskrift/Serie

Applied Physics B

Volym

78

Issue

2

Dokumenttyp

Artikel i tidskrift

Förlag

Springer

Ämne

  • Atom and Molecular Physics and Optics

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0946-2171