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Investigation of ro-vibrational spectra of small hydrocarbons at elevated temperatures using infrared degenerate four-wave mixing

Sahlberg, Anna Lena LU ; Zhou, Jianfeng LU ; Aldén, Marcus LU and Li, Zhongshan LU (2016) In Journal of Raman Spectroscopy 47(9). p.1130-1139
Abstract

The ro-vibrational spectra around 3 µm of four small hydrocarbons (C2H2, CH4, C2H6 and C2H4) at 296, 550 and 820 K have been investigated using infrared degenerate four-wave mixing (IR-DFWM). The spectra were recorded in gas flows of nitrogen with small admixtures of the hydrocarbons. A fused silica glass tube surrounded by an electric heating wire was used to heat the gas flows. The recorded IR-DFWM spectra are compared with simulations using the spectral information available in the HITRAN database, in order to identify spectral lines. The measurements demonstrate good signal to noise ratio and good sensitivity even at elevated temperatures. Several weak hot... (More)

The ro-vibrational spectra around 3 µm of four small hydrocarbons (C2H2, CH4, C2H6 and C2H4) at 296, 550 and 820 K have been investigated using infrared degenerate four-wave mixing (IR-DFWM). The spectra were recorded in gas flows of nitrogen with small admixtures of the hydrocarbons. A fused silica glass tube surrounded by an electric heating wire was used to heat the gas flows. The recorded IR-DFWM spectra are compared with simulations using the spectral information available in the HITRAN database, in order to identify spectral lines. The measurements demonstrate good signal to noise ratio and good sensitivity even at elevated temperatures. Several weak hot lines were detected that are not included in the current database. This paper demonstrates the potential of IR-DFWM for purposes of investigating spectral lines at elevated temperatures, which is often a challenging task with conventional absorption spectroscopy techniques. The possibility of applying IR-DFWM for combustion diagnostics of small hydrocarbons is discussed from the detection limits of the measurements and the potential water line interference. Because of the non-linear nature of the DFWM technique, it provides much higher contrast for strong lines of small molecules over backgrounds of high-density weak lines, which commonly exist in hot gas flows of thermochemical reactions.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
degenerate four-wave mixing, hydrocarbons, mid-infrared
in
Journal of Raman Spectroscopy
volume
47
issue
9
pages
10 pages
publisher
John Wiley & Sons
external identifiers
  • scopus:84986293308
  • wos:000384079400019
ISSN
0377-0486
DOI
10.1002/jrs.4862
language
English
LU publication?
yes
id
a570691e-6bf0-416f-b096-272ce609dcbc
date added to LUP
2016-11-11 14:19:26
date last changed
2017-09-17 09:32:29
@article{a570691e-6bf0-416f-b096-272ce609dcbc,
  abstract     = {<p>The ro-vibrational spectra around 3 µm of four small hydrocarbons (C<sub>2</sub>H<sub>2</sub>, CH<sub>4</sub>, C<sub>2</sub>H<sub>6</sub> and C<sub>2</sub>H<sub>4</sub>) at 296, 550 and 820 K have been investigated using infrared degenerate four-wave mixing (IR-DFWM). The spectra were recorded in gas flows of nitrogen with small admixtures of the hydrocarbons. A fused silica glass tube surrounded by an electric heating wire was used to heat the gas flows. The recorded IR-DFWM spectra are compared with simulations using the spectral information available in the HITRAN database, in order to identify spectral lines. The measurements demonstrate good signal to noise ratio and good sensitivity even at elevated temperatures. Several weak hot lines were detected that are not included in the current database. This paper demonstrates the potential of IR-DFWM for purposes of investigating spectral lines at elevated temperatures, which is often a challenging task with conventional absorption spectroscopy techniques. The possibility of applying IR-DFWM for combustion diagnostics of small hydrocarbons is discussed from the detection limits of the measurements and the potential water line interference. Because of the non-linear nature of the DFWM technique, it provides much higher contrast for strong lines of small molecules over backgrounds of high-density weak lines, which commonly exist in hot gas flows of thermochemical reactions.</p>},
  author       = {Sahlberg, Anna Lena and Zhou, Jianfeng and Aldén, Marcus and Li, Zhongshan},
  issn         = {0377-0486},
  keyword      = {degenerate four-wave mixing,hydrocarbons,mid-infrared},
  language     = {eng},
  month        = {09},
  number       = {9},
  pages        = {1130--1139},
  publisher    = {John Wiley & Sons},
  series       = {Journal of Raman Spectroscopy},
  title        = {Investigation of ro-vibrational spectra of small hydrocarbons at elevated temperatures using infrared degenerate four-wave mixing},
  url          = {http://dx.doi.org/10.1002/jrs.4862},
  volume       = {47},
  year         = {2016},
}