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LII-lidar: range-resolved backward picosecond laser-induced incandescence

Kaldvee, Billy LU ; Brackmann, Christian LU ; Aldén, Marcus LU and Bood, Joakim LU (2014) In Applied Physics B 115(1). p.111-121
Abstract
A novel concept for remote in situ detection of soot emissions by a combination of laser-induced incandescence (LII) and light detection and ranging (lidar) is presented. A lidar setup based on a picosecond Nd:YAG laser and time-resolved signal detection in the backward direction was used for LII measurements in sooty premixed ethylene-air flames. Measurements of LII-lidar signal versus laser fluence and flame equivalence ratio showed good qualitative agreement with data reported in literature. The LII-lidar signal showed a decay consisting of two components, with lifetimes of typically 20 and 70 ns, attributed to soot sublimation and conductive cooling, respectively. Theoretical considerations and analysis of the LII-lidar signal showed... (More)
A novel concept for remote in situ detection of soot emissions by a combination of laser-induced incandescence (LII) and light detection and ranging (lidar) is presented. A lidar setup based on a picosecond Nd:YAG laser and time-resolved signal detection in the backward direction was used for LII measurements in sooty premixed ethylene-air flames. Measurements of LII-lidar signal versus laser fluence and flame equivalence ratio showed good qualitative agreement with data reported in literature. The LII-lidar signal showed a decay consisting of two components, with lifetimes of typically 20 and 70 ns, attributed to soot sublimation and conductive cooling, respectively. Theoretical considerations and analysis of the LII-lidar signal showed that the derivative was proportional to the maximum value, which is an established measure of soot volume fraction. Utilizing this, differentiation of LII-lidar data gave profiles representing soot volume fraction with a range resolution of similar to 16 cm along the laser beam propagation axis. The accuracy of the evaluated LII-profiles was confirmed by comparison with LII-data measured simultaneously employing conventional right-angle detection. Thus, LII-lidar provides range-resolved single-ended detection, resourceful when optical access is restricted, extending the LII technique and opening up new possibilities for laser-based diagnostics of soot and other carbonaceous particles. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Applied Physics B
volume
115
issue
1
pages
111 - 121
publisher
Springer
external identifiers
  • wos:000332853000014
  • scopus:84899430207
ISSN
0946-2171
DOI
10.1007/s00340-013-5581-4
language
English
LU publication?
yes
id
328081e1-5294-4763-96b5-b82ea3f833a6 (old id 4410905)
date added to LUP
2014-04-29 10:52:36
date last changed
2017-04-02 03:05:41
@article{328081e1-5294-4763-96b5-b82ea3f833a6,
  abstract     = {A novel concept for remote in situ detection of soot emissions by a combination of laser-induced incandescence (LII) and light detection and ranging (lidar) is presented. A lidar setup based on a picosecond Nd:YAG laser and time-resolved signal detection in the backward direction was used for LII measurements in sooty premixed ethylene-air flames. Measurements of LII-lidar signal versus laser fluence and flame equivalence ratio showed good qualitative agreement with data reported in literature. The LII-lidar signal showed a decay consisting of two components, with lifetimes of typically 20 and 70 ns, attributed to soot sublimation and conductive cooling, respectively. Theoretical considerations and analysis of the LII-lidar signal showed that the derivative was proportional to the maximum value, which is an established measure of soot volume fraction. Utilizing this, differentiation of LII-lidar data gave profiles representing soot volume fraction with a range resolution of similar to 16 cm along the laser beam propagation axis. The accuracy of the evaluated LII-profiles was confirmed by comparison with LII-data measured simultaneously employing conventional right-angle detection. Thus, LII-lidar provides range-resolved single-ended detection, resourceful when optical access is restricted, extending the LII technique and opening up new possibilities for laser-based diagnostics of soot and other carbonaceous particles.},
  author       = {Kaldvee, Billy and Brackmann, Christian and Aldén, Marcus and Bood, Joakim},
  issn         = {0946-2171},
  language     = {eng},
  number       = {1},
  pages        = {111--121},
  publisher    = {Springer},
  series       = {Applied Physics B},
  title        = {LII-lidar: range-resolved backward picosecond laser-induced incandescence},
  url          = {http://dx.doi.org/10.1007/s00340-013-5581-4},
  volume       = {115},
  year         = {2014},
}