Advanced

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

Bladh, Henrik LU and Bengtsson, Per-Erik LU (2004) In Applied Physics B 78(2). p.241-248
Abstract
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... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Applied Physics B
volume
78
issue
2
pages
241 - 248
publisher
Springer
external identifiers
  • wos:000188208700020
  • scopus:1242265454
ISSN
0946-2171
DOI
10.1007/s00340-003-1362-9
language
English
LU publication?
yes
id
ebda4770-bbd8-41a7-838a-9c1cda4f0024 (old id 289903)
date added to LUP
2007-10-17 09:47:12
date last changed
2017-05-21 03:37:34
@article{ebda4770-bbd8-41a7-838a-9c1cda4f0024,
  abstract     = {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.},
  author       = {Bladh, Henrik and Bengtsson, Per-Erik},
  issn         = {0946-2171},
  language     = {eng},
  number       = {2},
  pages        = {241--248},
  publisher    = {Springer},
  series       = {Applied Physics B},
  title        = {Characteristics of laser-induced incandescence from soot in studies of a time-dependent heat- and mass-transfer model},
  url          = {http://dx.doi.org/10.1007/s00340-003-1362-9},
  volume       = {78},
  year         = {2004},
}