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Laser-induced incandescence for soot particle size and volume fraction measurements using on-line extinction calibration

Axelsson, Boman LU ; Collin, Robert LU and Bengtsson, Per-Erik LU (2001) In Applied Physics B 72(3). p.367-372
Abstract
A novel technique for two-dimensional measurements of soot volume fraction and particle size has been developed. It is based on a combined measurement of extinction and laser-induced incandescence using Nd:YAG laser wavelengths of 532 nm and 1064 nm. A low-energy laser pulse at 532 nm was used for extinction measurements and was followed by a more intense pulse at 1064 nm, delayed by 15 ns, for LII measurements. The 532-nm beam was split into a signal beam passing the flame and a reference beam, both of which were directed to a dye cell. The resulting fluorescence signals, from which the extinction was deduced, together with the LII signal, were registered on a single CCD detector. Thus the two-dimensional LII image could be converted to a... (More)
A novel technique for two-dimensional measurements of soot volume fraction and particle size has been developed. It is based on a combined measurement of extinction and laser-induced incandescence using Nd:YAG laser wavelengths of 532 nm and 1064 nm. A low-energy laser pulse at 532 nm was used for extinction measurements and was followed by a more intense pulse at 1064 nm, delayed by 15 ns, for LII measurements. The 532-nm beam was split into a signal beam passing the flame and a reference beam, both of which were directed to a dye cell. The resulting fluorescence signals, from which the extinction was deduced, together with the LII signal, were registered on a single CCD detector. Thus the two-dimensional LII image could be converted to a soot volume fraction map through a calibration procedure during the same laser shot. The soot particle sizes were evaluated from the ratio of the temporal LII signals at two gate time positions. The uncertainty in the particle sizing arose mainly from the low signal for small particles at long gate times and the uncertainty in the flame temperature. The technique was applied to a well-characterized premixed flat flame, the soot properties of which had been previously thoroughly investigated. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Applied Physics B
volume
72
issue
3
pages
367 - 372
publisher
Springer
external identifiers
  • scopus:0034802231
ISSN
0946-2171
DOI
10.1007/s003400100504
language
English
LU publication?
yes
id
3e36653e-e737-478e-bcbe-bc1aaf747a5c (old id 4935756)
date added to LUP
2015-01-19 14:14:37
date last changed
2018-06-03 03:34:48
@article{3e36653e-e737-478e-bcbe-bc1aaf747a5c,
  abstract     = {A novel technique for two-dimensional measurements of soot volume fraction and particle size has been developed. It is based on a combined measurement of extinction and laser-induced incandescence using Nd:YAG laser wavelengths of 532 nm and 1064 nm. A low-energy laser pulse at 532 nm was used for extinction measurements and was followed by a more intense pulse at 1064 nm, delayed by 15 ns, for LII measurements. The 532-nm beam was split into a signal beam passing the flame and a reference beam, both of which were directed to a dye cell. The resulting fluorescence signals, from which the extinction was deduced, together with the LII signal, were registered on a single CCD detector. Thus the two-dimensional LII image could be converted to a soot volume fraction map through a calibration procedure during the same laser shot. The soot particle sizes were evaluated from the ratio of the temporal LII signals at two gate time positions. The uncertainty in the particle sizing arose mainly from the low signal for small particles at long gate times and the uncertainty in the flame temperature. The technique was applied to a well-characterized premixed flat flame, the soot properties of which had been previously thoroughly investigated.},
  author       = {Axelsson, Boman and Collin, Robert and Bengtsson, Per-Erik},
  issn         = {0946-2171},
  language     = {eng},
  number       = {3},
  pages        = {367--372},
  publisher    = {Springer},
  series       = {Applied Physics B},
  title        = {Laser-induced incandescence for soot particle size and volume fraction measurements using on-line extinction calibration},
  url          = {http://dx.doi.org/10.1007/s003400100504},
  volume       = {72},
  year         = {2001},
}