Soot visualisation by use of laser-induced soot vapourisation in combination with polarisation spectroscopy
Walewski, Joachim LU ; Rupinski, M ; Bladh, Henrik LU ; Li, Zhongshan LU ; Bengtsson, Per-Erik LU
and Aldén, Marcus
LU
(2003)
In Applied Physics B
77(4).
p.447-454
- Abstract
- A novel approach to the visualisation of soot is presented. It relies on a combination of laser-induced soot vapourisation and consecutive polarisation spectroscopy. Upon soot vapourisation, molecular fragments (for example, C-2) emerge, and may serve as effective tracers for soot. In this study we demonstrate that saturated polarisation spectroscopy on photoinduced C-2 can be exploited for soot detection. Signal maps featuring high signal-to-noise ratios were readily recorded in ethyne-rich flames and any spurious background, for example, caused by Rayleigh scattering, was successfully suppressed by means of spatial filtering. Additionally, investigations were carried out addressing how the attained signals correlate with local soot... (More)
- A novel approach to the visualisation of soot is presented. It relies on a combination of laser-induced soot vapourisation and consecutive polarisation spectroscopy. Upon soot vapourisation, molecular fragments (for example, C-2) emerge, and may serve as effective tracers for soot. In this study we demonstrate that saturated polarisation spectroscopy on photoinduced C-2 can be exploited for soot detection. Signal maps featuring high signal-to-noise ratios were readily recorded in ethyne-rich flames and any spurious background, for example, caused by Rayleigh scattering, was successfully suppressed by means of spatial filtering. Additionally, investigations were carried out addressing how the attained signals correlate with local soot volumne fractions. For this purpose, height profiles of C-2 number densities inferred from the polarisation spectroscopy signal maps were compared with profiles of the soot volumne fraction inferred from measurements with laser-induced incandescence. For low soot volumne fractions, the shapes of the height profiles from our approach agree rather well with the latter; they do not agree for higher soot volumne fractions. Further investigation is required to resolve this discrepancy. Scattering from particles in the Mie scattering range may hamper the application of this approach, and avenues are suggested for extending the applicability of the approach presented to large soot particles. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/297411
- author
- Walewski, Joachim
LU
; Rupinski, M
; Bladh, Henrik
LU
; Li, Zhongshan
LU
; Bengtsson, Per-Erik
LU
and Aldén, Marcus
LU
- organization
- publishing date
- 2003
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Applied Physics B
- volume
- 77
- issue
- 4
- pages
- 447 - 454
- publisher
- Springer
- external identifiers
-
- wos:000186179100014
- scopus:0142185294
- ISSN
- 0946-2171
- DOI
- 10.1007/s00340-003-1277-5
- language
- English
- LU publication?
- yes
- id
- 331b59f6-d972-49a6-9aaa-1781c2cb4c12 (old id 297411)
- date added to LUP
- 2016-04-01 12:04:13
- date last changed
- 2022-04-21 01:58:23
@article{331b59f6-d972-49a6-9aaa-1781c2cb4c12,
abstract = {{A novel approach to the visualisation of soot is presented. It relies on a combination of laser-induced soot vapourisation and consecutive polarisation spectroscopy. Upon soot vapourisation, molecular fragments (for example, C-2) emerge, and may serve as effective tracers for soot. In this study we demonstrate that saturated polarisation spectroscopy on photoinduced C-2 can be exploited for soot detection. Signal maps featuring high signal-to-noise ratios were readily recorded in ethyne-rich flames and any spurious background, for example, caused by Rayleigh scattering, was successfully suppressed by means of spatial filtering. Additionally, investigations were carried out addressing how the attained signals correlate with local soot volumne fractions. For this purpose, height profiles of C-2 number densities inferred from the polarisation spectroscopy signal maps were compared with profiles of the soot volumne fraction inferred from measurements with laser-induced incandescence. For low soot volumne fractions, the shapes of the height profiles from our approach agree rather well with the latter; they do not agree for higher soot volumne fractions. Further investigation is required to resolve this discrepancy. Scattering from particles in the Mie scattering range may hamper the application of this approach, and avenues are suggested for extending the applicability of the approach presented to large soot particles.}},
author = {{Walewski, Joachim and Rupinski, M and Bladh, Henrik and Li, Zhongshan and Bengtsson, Per-Erik and Aldén, Marcus}},
issn = {{0946-2171}},
language = {{eng}},
number = {{4}},
pages = {{447--454}},
publisher = {{Springer}},
series = {{Applied Physics B}},
title = {{Soot visualisation by use of laser-induced soot vapourisation in combination with polarisation spectroscopy}},
url = {{http://dx.doi.org/10.1007/s00340-003-1277-5}},
doi = {{10.1007/s00340-003-1277-5}},
volume = {{77}},
year = {{2003}},
}