Laser-induced incandescence (2λ and 2C) for estimating absorption efficiency of differently matured soot
Török, Sandra LU ; Mannazhi, Manu LU and Bengtsson, Per Erik LU
(2021)
In Applied Physics B: Lasers and Optics
127(7).
- Abstract
Two-wavelength and two-color laser-induced incandescence (2λ–2C-LII) was used to study the absorption properties of three types of cold soot of different maturity from a mini-CAST soot generator. LII fluence curve analysis allowed for estimating absorption wavelength dependence in terms of dispersion coefficients ξ by the use of two excitation wavelengths (532 and 1064 nm). The estimated ξ (based on E(m, λ) ∝ λ1−ξ) spanned from ~ 1.2 for the mature soot, up to 2.3 for the young soot. The results for the mature soot showed good agreement with previous measurement using multi-wavelength extinction. For the young soot, however, some discrepancy was observed suggesting a weaker wavelength dependence (lower ξ) from the LII fluence... (More)
Two-wavelength and two-color laser-induced incandescence (2λ–2C-LII) was used to study the absorption properties of three types of cold soot of different maturity from a mini-CAST soot generator. LII fluence curve analysis allowed for estimating absorption wavelength dependence in terms of dispersion coefficients ξ by the use of two excitation wavelengths (532 and 1064 nm). The estimated ξ (based on E(m, λ) ∝ λ1−ξ) spanned from ~ 1.2 for the mature soot, up to 2.3 for the young soot. The results for the mature soot showed good agreement with previous measurement using multi-wavelength extinction. For the young soot, however, some discrepancy was observed suggesting a weaker wavelength dependence (lower ξ) from the LII fluence analysis. Furthermore, an estimation of the E(m, λ) for the different types of soot was done from the experimental fluence curves with temperature analysis in the low-fluence regime and simulations using an LII model. Additionally, uncertainties and limitations were discussed. Finally, it should be pointed out that caution has to be taken when interpreting 2λ-LII results to obtain quantitative absorption properties of less mature soot, which may be influenced by thermal annealing during the laser pulse and by absorption from non-refractory species externally/internally mixed with the soot.
(Less)
- author
- Török, Sandra
LU
; Mannazhi, Manu
LU
and Bengtsson, Per Erik
LU
- organization
- publishing date
- 2021-07-01
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Applied Physics B: Lasers and Optics
- volume
- 127
- issue
- 7
- article number
- 96
- publisher
- Springer
- external identifiers
-
- scopus:85107185263
- ISSN
- 0946-2171
- DOI
- 10.1007/s00340-021-07638-1
- language
- English
- LU publication?
- yes
- id
- 7f4f789b-ae19-40d5-94e5-863811e35d80
- date added to LUP
- 2021-06-24 12:45:13
- date last changed
- 2022-04-27 02:36:30
@article{7f4f789b-ae19-40d5-94e5-863811e35d80,
abstract = {{<p>Two-wavelength and two-color laser-induced incandescence (2λ–2C-LII) was used to study the absorption properties of three types of cold soot of different maturity from a mini-CAST soot generator. LII fluence curve analysis allowed for estimating absorption wavelength dependence in terms of dispersion coefficients ξ by the use of two excitation wavelengths (532 and 1064 nm). The estimated ξ (based on E(m, λ) ∝ λ<sup>1−ξ</sup>) spanned from ~ 1.2 for the mature soot, up to 2.3 for the young soot. The results for the mature soot showed good agreement with previous measurement using multi-wavelength extinction. For the young soot, however, some discrepancy was observed suggesting a weaker wavelength dependence (lower ξ) from the LII fluence analysis. Furthermore, an estimation of the E(m, λ) for the different types of soot was done from the experimental fluence curves with temperature analysis in the low-fluence regime and simulations using an LII model. Additionally, uncertainties and limitations were discussed. Finally, it should be pointed out that caution has to be taken when interpreting 2λ-LII results to obtain quantitative absorption properties of less mature soot, which may be influenced by thermal annealing during the laser pulse and by absorption from non-refractory species externally/internally mixed with the soot.</p>}},
author = {{Török, Sandra and Mannazhi, Manu and Bengtsson, Per Erik}},
issn = {{0946-2171}},
language = {{eng}},
month = {{07}},
number = {{7}},
publisher = {{Springer}},
series = {{Applied Physics B: Lasers and Optics}},
title = {{Laser-induced incandescence (2λ and 2C) for estimating absorption efficiency of differently matured soot}},
url = {{http://dx.doi.org/10.1007/s00340-021-07638-1}},
doi = {{10.1007/s00340-021-07638-1}},
volume = {{127}},
year = {{2021}},
}