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Temperature measurements in heated gases and flames using carbon monoxide femtosecond two-photon laser-induced fluorescence

Li, Bo LU ; Zhang, Dayuan ; Brackmann, Christian LU ; Han, Lei ; Feng, Zhanyu ; Gao, Qiang LU and Li, Zhongshan LU (2023) In Sensors and Actuators A: Physical 353.
Abstract

Nonintrusive temperature measurement is crucial in combustion research. Here, we propose a thermometric technique based on femtosecond two-photon laser-induced fluorescence of carbon monoxide (CO-fs-TPLIF). A femtosecond laser with a wavelength of 230 nm was used as an excitation source. Owing to its intrinsic broad bandwidth, dual vibrational bands of the B1Σ+ ← X1Σ+ transition of CO can be simultaneously excited. As a result, the fluorescence from the conventional bands (0,n) and the hot vibrational bands (1,n) of the B1Σ+ → A1Πu transition of CO can be simultaneously detected. Hence, the temperature-dependent Boltzmann distribution can be assessed... (More)

Nonintrusive temperature measurement is crucial in combustion research. Here, we propose a thermometric technique based on femtosecond two-photon laser-induced fluorescence of carbon monoxide (CO-fs-TPLIF). A femtosecond laser with a wavelength of 230 nm was used as an excitation source. Owing to its intrinsic broad bandwidth, dual vibrational bands of the B1Σ+ ← X1Σ+ transition of CO can be simultaneously excited. As a result, the fluorescence from the conventional bands (0,n) and the hot vibrational bands (1,n) of the B1Σ+ → A1Πu transition of CO can be simultaneously detected. Hence, the temperature-dependent Boltzmann distribution can be assessed from the relative fluorescence intensity related to different ro-vibrational states, and the temperature can be extracted from the analysis of the recorded fluorescence spectra. Two temperature calibration methods were developed, for the low-temperature range (298–1173 K), the rotational-state-associated bandwidths of the spectra were used; for the flame temperature range, the spectral intensity ratios between the hot vibrational bands (1-n) and the conventional bands (0-n) were used. The CO-fs-TPLIF thermometric technique features the advantages of a simple optical setup and the ability of one-dimensional measurements with high spatial resolution.

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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Carbon monoxide, Femtosecond laser, Laser-induced fluorescence, Thermometry
in
Sensors and Actuators A: Physical
volume
353
article number
114212
publisher
Elsevier
external identifiers
  • scopus:85148047440
ISSN
0924-4247
DOI
10.1016/j.sna.2023.114212
language
English
LU publication?
yes
id
0c84d6f6-0225-47b9-b29b-9f249b92f5fe
date added to LUP
2023-03-03 12:32:06
date last changed
2023-11-21 17:05:19
@article{0c84d6f6-0225-47b9-b29b-9f249b92f5fe,
  abstract     = {{<p>Nonintrusive temperature measurement is crucial in combustion research. Here, we propose a thermometric technique based on femtosecond two-photon laser-induced fluorescence of carbon monoxide (CO-fs-TPLIF). A femtosecond laser with a wavelength of 230 nm was used as an excitation source. Owing to its intrinsic broad bandwidth, dual vibrational bands of the B<sup>1</sup>Σ<sup>+</sup> ← X<sup>1</sup>Σ<sup>+</sup> transition of CO can be simultaneously excited. As a result, the fluorescence from the conventional bands (0,n) and the hot vibrational bands (1,n) of the B<sup>1</sup>Σ<sup>+</sup> → A<sup>1</sup>Π<sub>u</sub> transition of CO can be simultaneously detected. Hence, the temperature-dependent Boltzmann distribution can be assessed from the relative fluorescence intensity related to different ro-vibrational states, and the temperature can be extracted from the analysis of the recorded fluorescence spectra. Two temperature calibration methods were developed, for the low-temperature range (298–1173 K), the rotational-state-associated bandwidths of the spectra were used; for the flame temperature range, the spectral intensity ratios between the hot vibrational bands (1-n) and the conventional bands (0-n) were used. The CO-fs-TPLIF thermometric technique features the advantages of a simple optical setup and the ability of one-dimensional measurements with high spatial resolution.</p>}},
  author       = {{Li, Bo and Zhang, Dayuan and Brackmann, Christian and Han, Lei and Feng, Zhanyu and Gao, Qiang and Li, Zhongshan}},
  issn         = {{0924-4247}},
  keywords     = {{Carbon monoxide; Femtosecond laser; Laser-induced fluorescence; Thermometry}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Sensors and Actuators A: Physical}},
  title        = {{Temperature measurements in heated gases and flames using carbon monoxide femtosecond two-photon laser-induced fluorescence}},
  url          = {{http://dx.doi.org/10.1016/j.sna.2023.114212}},
  doi          = {{10.1016/j.sna.2023.114212}},
  volume       = {{353}},
  year         = {{2023}},
}