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Experimental and theoretical comparison of spatially resolved laser-induced incandescence (LII) signals of soot in backward and right-angle configuration

Bladh, Henrik LU ; Bengtsson, Per-Erik LU orcid ; Delhay, J ; Bouvier, Y ; Therssen, E and Desgroux, P (2006) In Applied Physics B 83(3). p.423-433
Abstract
In-situ measurements of soot volume fraction in the exhausts of jet engines can be carried out using the laser-induced incandescence (LII) technique in backward configuration, in which the signal is detected in the opposite direction of the laser beam propagation. In order to improve backward LII for quantitative measurements, we have in this work made a detailed experimental and theoretical investigation in which backward LII has been compared with the more commonly used right-angle LII technique. Both configurations were used in simultaneous visualization experiments at various pulse energies and gate timings in a stabilized methane diffusion flame. The spatial near-Gaussian laser energy distribution was monitored on-line as well as the... (More)
In-situ measurements of soot volume fraction in the exhausts of jet engines can be carried out using the laser-induced incandescence (LII) technique in backward configuration, in which the signal is detected in the opposite direction of the laser beam propagation. In order to improve backward LII for quantitative measurements, we have in this work made a detailed experimental and theoretical investigation in which backward LII has been compared with the more commonly used right-angle LII technique. Both configurations were used in simultaneous visualization experiments at various pulse energies and gate timings in a stabilized methane diffusion flame. The spatial near-Gaussian laser energy distribution was monitored on-line as well as the time-resolved LII signal. A heat and mass transfer model for soot particles exposed to laser radiation was used to theoretically predict both the temporal and spatial LII signals. Comparison between experimental and theoretical LII signals indicates similar general behaviour, for example the broadening of the spatial LII distribution and the hole-burning effect at centre of the beam due to sublimation for increasing laser pulse energies. However, our comparison also indicates that the current heat and mass transfer model overpredicts signal intensities at higher fluence, and possible reasons for this behaviour are discussed. (Less)
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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Applied Physics B
volume
83
issue
3
pages
423 - 433
publisher
Springer
external identifiers
  • wos:000237499900008
  • scopus:33646679419
ISSN
0946-2171
DOI
10.1007/s00340-006-2197-y
language
English
LU publication?
yes
id
6cfb749c-4b2d-4629-a94c-1e9cc3a27432 (old id 409822)
date added to LUP
2016-04-01 11:35:38
date last changed
2021-10-06 04:40:17
@article{6cfb749c-4b2d-4629-a94c-1e9cc3a27432,
  abstract     = {In-situ measurements of soot volume fraction in the exhausts of jet engines can be carried out using the laser-induced incandescence (LII) technique in backward configuration, in which the signal is detected in the opposite direction of the laser beam propagation. In order to improve backward LII for quantitative measurements, we have in this work made a detailed experimental and theoretical investigation in which backward LII has been compared with the more commonly used right-angle LII technique. Both configurations were used in simultaneous visualization experiments at various pulse energies and gate timings in a stabilized methane diffusion flame. The spatial near-Gaussian laser energy distribution was monitored on-line as well as the time-resolved LII signal. A heat and mass transfer model for soot particles exposed to laser radiation was used to theoretically predict both the temporal and spatial LII signals. Comparison between experimental and theoretical LII signals indicates similar general behaviour, for example the broadening of the spatial LII distribution and the hole-burning effect at centre of the beam due to sublimation for increasing laser pulse energies. However, our comparison also indicates that the current heat and mass transfer model overpredicts signal intensities at higher fluence, and possible reasons for this behaviour are discussed.},
  author       = {Bladh, Henrik and Bengtsson, Per-Erik and Delhay, J and Bouvier, Y and Therssen, E and Desgroux, P},
  issn         = {0946-2171},
  language     = {eng},
  number       = {3},
  pages        = {423--433},
  publisher    = {Springer},
  series       = {Applied Physics B},
  title        = {Experimental and theoretical comparison of spatially resolved laser-induced incandescence (LII) signals of soot in backward and right-angle configuration},
  url          = {https://lup.lub.lu.se/search/ws/files/2553251/1411392.pdf},
  doi          = {10.1007/s00340-006-2197-y},
  volume       = {83},
  year         = {2006},
}