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Cryogenic to high temperature measurements in gas flows by femtosecond laser-induced CN luminescence

Han, Lei ; Gao, Qiang ; Li, Bo and Li, Zhongshan LU (2024) In Measurement: Journal of the International Measurement Confederation 229.
Abstract

Temperature is a crucial parameter of gas flow fields. Here, we present a novel thermometry technique for gas flow based on femtosecond laser-induced cyano (CN) luminescence. Specifically, a femtosecond laser with a central wavelength of 267 nm is used to induce CN violet emissions in a nitrogen flow seeded with a trace amount of methane. The spectral peak of CN B2Σ+- X2Σ+ (0,0) transitions shift to longer wavelengths with increasing temperatures, and the concentration of methane does not influence this spectral shift. The calibration curve of the spectral peak position and the temperature ranging from 93 to 1028 K is obtained through the experiment, and the curve exhibits a nearly linear... (More)

Temperature is a crucial parameter of gas flow fields. Here, we present a novel thermometry technique for gas flow based on femtosecond laser-induced cyano (CN) luminescence. Specifically, a femtosecond laser with a central wavelength of 267 nm is used to induce CN violet emissions in a nitrogen flow seeded with a trace amount of methane. The spectral peak of CN B2Σ+- X2Σ+ (0,0) transitions shift to longer wavelengths with increasing temperatures, and the concentration of methane does not influence this spectral shift. The calibration curve of the spectral peak position and the temperature ranging from 93 to 1028 K is obtained through the experiment, and the curve exhibits a nearly linear trend in the low-temperature regime, and an uncertainty of 3.6 % at 173 K is obtained. The technique's wide temperature measurement capability makes it suitable for gas flow temperature measurements, particularly in environments with significant temperature variations, such as wind tunnels.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
CN, Cryogenic temperature measurement, Femtosecond laser, Thermometry
in
Measurement: Journal of the International Measurement Confederation
volume
229
article number
114491
publisher
Elsevier
external identifiers
  • scopus:85187954239
ISSN
0263-2241
DOI
10.1016/j.measurement.2024.114491
language
English
LU publication?
yes
id
9458a372-c9be-476f-a47b-94fd9be2b44c
date added to LUP
2024-03-27 14:10:23
date last changed
2024-03-27 14:10:34
@article{9458a372-c9be-476f-a47b-94fd9be2b44c,
  abstract     = {{<p>Temperature is a crucial parameter of gas flow fields. Here, we present a novel thermometry technique for gas flow based on femtosecond laser-induced cyano (CN) luminescence. Specifically, a femtosecond laser with a central wavelength of 267 nm is used to induce CN violet emissions in a nitrogen flow seeded with a trace amount of methane. The spectral peak of CN B<sup>2</sup>Σ<sup>+</sup>- X<sup>2</sup>Σ<sup>+</sup> (0,0) transitions shift to longer wavelengths with increasing temperatures, and the concentration of methane does not influence this spectral shift. The calibration curve of the spectral peak position and the temperature ranging from 93 to 1028 K is obtained through the experiment, and the curve exhibits a nearly linear trend in the low-temperature regime, and an uncertainty of 3.6 % at 173 K is obtained. The technique's wide temperature measurement capability makes it suitable for gas flow temperature measurements, particularly in environments with significant temperature variations, such as wind tunnels.</p>}},
  author       = {{Han, Lei and Gao, Qiang and Li, Bo and Li, Zhongshan}},
  issn         = {{0263-2241}},
  keywords     = {{CN; Cryogenic temperature measurement; Femtosecond laser; Thermometry}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Measurement: Journal of the International Measurement Confederation}},
  title        = {{Cryogenic to high temperature measurements in gas flows by femtosecond laser-induced CN luminescence}},
  url          = {{http://dx.doi.org/10.1016/j.measurement.2024.114491}},
  doi          = {{10.1016/j.measurement.2024.114491}},
  volume       = {{229}},
  year         = {{2024}},
}