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Oxygen concentration and temperature measurements in N2-O2 mixtures using rotational coherent anti-Stokes Raman spectroscopy

Martinsson, L. LU ; Bengtsson, P. E. LU and Aldén, Marcus LU (1996) In Applied Physics B 62(1). p.29-37
Abstract

The accuracy and precision of oxygen concentration and temperature measured by dual-broadband rotational Coherent Anti-Stokes Raman Spectroscopy (CARS) were investigated in nitrogen-oxygen mixtures at atmospheric pressure and temperatures between 290 and 1410 K. The relative standard deviation of temperatures evaluated from pure oxygen rotational CARS spectra was found to be around 5%, and the mean temperature was the same as for nitrogen CARS spectra, except for temperatures above 1000 K, where the temperature was 120 K below the correct value. The in situ calibrated oxygen concentrations were within 10% of the correct value, with a standard deviation of around 1.2% for the mixtures of 12 and 20% oxygen in nitrogen. For the lowest... (More)

The accuracy and precision of oxygen concentration and temperature measured by dual-broadband rotational Coherent Anti-Stokes Raman Spectroscopy (CARS) were investigated in nitrogen-oxygen mixtures at atmospheric pressure and temperatures between 290 and 1410 K. The relative standard deviation of temperatures evaluated from pure oxygen rotational CARS spectra was found to be around 5%, and the mean temperature was the same as for nitrogen CARS spectra, except for temperatures above 1000 K, where the temperature was 120 K below the correct value. The in situ calibrated oxygen concentrations were within 10% of the correct value, with a standard deviation of around 1.2% for the mixtures of 12 and 20% oxygen in nitrogen. For the lowest oxygen concentrations considered in this study (2 and 4%), the systematic errors in the evaluated concentrations were very large, and the standard deviation of repeated single-shot measurements was above 2%. However, employing weighting in the spectral fitting routine reduced the errors in the concentration and the single-shot standard deviation was lowered to 0.5%. Finally, it was shown that spectral interference (from oxygen) in a rotational CARS spectrum of nitrogen generally had little impact on the temperature evaluated from fitting the spectra to theoretical nitrogen spectra.

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author
organization
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type
Contribution to journal
publication status
published
in
Applied Physics B
volume
62
issue
1
pages
9 pages
publisher
Springer
external identifiers
  • Scopus:0029733146
ISSN
0946-2171
language
English
LU publication?
yes
id
1375fc82-1cd9-4c13-a7e4-bde669f671d5
date added to LUP
2016-06-29 16:59:10
date last changed
2016-10-13 05:11:06
@misc{1375fc82-1cd9-4c13-a7e4-bde669f671d5,
  abstract     = {<p>The accuracy and precision of oxygen concentration and temperature measured by dual-broadband rotational Coherent Anti-Stokes Raman Spectroscopy (CARS) were investigated in nitrogen-oxygen mixtures at atmospheric pressure and temperatures between 290 and 1410 K. The relative standard deviation of temperatures evaluated from pure oxygen rotational CARS spectra was found to be around 5%, and the mean temperature was the same as for nitrogen CARS spectra, except for temperatures above 1000 K, where the temperature was 120 K below the correct value. The in situ calibrated oxygen concentrations were within 10% of the correct value, with a standard deviation of around 1.2% for the mixtures of 12 and 20% oxygen in nitrogen. For the lowest oxygen concentrations considered in this study (2 and 4%), the systematic errors in the evaluated concentrations were very large, and the standard deviation of repeated single-shot measurements was above 2%. However, employing weighting in the spectral fitting routine reduced the errors in the concentration and the single-shot standard deviation was lowered to 0.5%. Finally, it was shown that spectral interference (from oxygen) in a rotational CARS spectrum of nitrogen generally had little impact on the temperature evaluated from fitting the spectra to theoretical nitrogen spectra.</p>},
  author       = {Martinsson, L. and Bengtsson, P. E. and Aldén, Marcus},
  issn         = {0946-2171},
  language     = {eng},
  number       = {1},
  pages        = {29--37},
  publisher    = {ARRAY(0x4ac4ab0)},
  series       = {Applied Physics B},
  title        = {Oxygen concentration and temperature measurements in N<sub>2</sub>-O<sub>2</sub> mixtures using rotational coherent anti-Stokes Raman spectroscopy},
  volume       = {62},
  year         = {1996},
}