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Two-photon-excited fluorescence of CO : Experiments and modeling

Ruchkina, Maria LU ; Ding, Pengji LU orcid ; Aldén, Marcus LU ; Bood, Joakim LU and Brackmann, Christian LU (2019) In Optics Express 27(18). p.25656-25669
Abstract

A model based on rate-equation analysis has been developed for simulation of two-photon-excited laser-induced fluorescence of carbon monoxide (CO) in the Hopfield-Birge band at 230 nm. The model has been compared with experimental fluorescence profiles measured along focused beams provided by lasers emitting nano-, pico-, and femtosecond pulses. Good quantitative agreement was obtained between simulations and experimental data obtained in premixed CH4/C2H4-air flames. For excitation with femtosecond pulses, experimental and simulated fluorescence signals showed quadratic dependence on laser power under conditions of low laser irradiance, whereas different sublinear dependencies were obtained at higher... (More)

A model based on rate-equation analysis has been developed for simulation of two-photon-excited laser-induced fluorescence of carbon monoxide (CO) in the Hopfield-Birge band at 230 nm. The model has been compared with experimental fluorescence profiles measured along focused beams provided by lasers emitting nano-, pico-, and femtosecond pulses. Good quantitative agreement was obtained between simulations and experimental data obtained in premixed CH4/C2H4-air flames. For excitation with femtosecond pulses, experimental and simulated fluorescence signals showed quadratic dependence on laser power under conditions of low laser irradiance, whereas different sublinear dependencies were obtained at higher irradiances due to photoionization. Simulations of CO signal versus femtosecond laser linewidth suggest the strongest signal for a transform-limited pulse, which is sufficiently broad spectrally to cover the CO Q-branch absorption spectrum. Altogether, the developed rate-equation model allows for analysis of two-photon excitation fluorescence to arrange suitable diagnostic configurations and retrieve quantitative data for CO as well as other species in combustion, such as atomic oxygen and hydrogen.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Optics Express
volume
27
issue
18
pages
14 pages
publisher
Optical Society of America
external identifiers
  • scopus:85071541732
  • pmid:31510434
ISSN
1094-4087
DOI
10.1364/OE.27.025656
language
English
LU publication?
yes
id
3e714665-274e-404f-bda6-e917a1c1078f
date added to LUP
2019-09-17 10:46:54
date last changed
2024-04-30 21:12:33
@article{3e714665-274e-404f-bda6-e917a1c1078f,
  abstract     = {{<p>A model based on rate-equation analysis has been developed for simulation of two-photon-excited laser-induced fluorescence of carbon monoxide (CO) in the Hopfield-Birge band at 230 nm. The model has been compared with experimental fluorescence profiles measured along focused beams provided by lasers emitting nano-, pico-, and femtosecond pulses. Good quantitative agreement was obtained between simulations and experimental data obtained in premixed CH<sub>4</sub>/C<sub>2</sub>H<sub>4</sub>-air flames. For excitation with femtosecond pulses, experimental and simulated fluorescence signals showed quadratic dependence on laser power under conditions of low laser irradiance, whereas different sublinear dependencies were obtained at higher irradiances due to photoionization. Simulations of CO signal versus femtosecond laser linewidth suggest the strongest signal for a transform-limited pulse, which is sufficiently broad spectrally to cover the CO Q-branch absorption spectrum. Altogether, the developed rate-equation model allows for analysis of two-photon excitation fluorescence to arrange suitable diagnostic configurations and retrieve quantitative data for CO as well as other species in combustion, such as atomic oxygen and hydrogen.</p>}},
  author       = {{Ruchkina, Maria and Ding, Pengji and Aldén, Marcus and Bood, Joakim and Brackmann, Christian}},
  issn         = {{1094-4087}},
  language     = {{eng}},
  number       = {{18}},
  pages        = {{25656--25669}},
  publisher    = {{Optical Society of America}},
  series       = {{Optics Express}},
  title        = {{Two-photon-excited fluorescence of CO : Experiments and modeling}},
  url          = {{https://lup.lub.lu.se/search/files/119484905/oe_27_18_25656.pdf}},
  doi          = {{10.1364/OE.27.025656}},
  volume       = {{27}},
  year         = {{2019}},
}