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On the sensitivity of rotational CARS N-2 thermometry to the Herman-Wallis factor

Bohlin, Alexis LU ; Bengtsson, Per-Erik LU and Marrocco, Michele (2011) In Journal of Raman Spectroscopy 42(10). p.1843-1847
Abstract
Purely rotational spectral signals of coherent anti-Stokes Raman scattering (CARS) from nitrogen molecules are studied as a function of the vibration-rotation interaction that weakens the rigid rotor approximation under which the dominant terms of the Raman cross section are calculated. The effect of the vibration-rotation interaction is quantified by means of the Herman-Wallis (HW) factor, and different approaches to its determination are evaluated in terms of their relative contribution to the CARS intensity and thermometric measurements made in a fuel-rich hydrocarbon flame. Known HW factors are contrasted with more complete expressions of recent derivation, and it is found that relative line strength adjustments amount to about a few... (More)
Purely rotational spectral signals of coherent anti-Stokes Raman scattering (CARS) from nitrogen molecules are studied as a function of the vibration-rotation interaction that weakens the rigid rotor approximation under which the dominant terms of the Raman cross section are calculated. The effect of the vibration-rotation interaction is quantified by means of the Herman-Wallis (HW) factor, and different approaches to its determination are evaluated in terms of their relative contribution to the CARS intensity and thermometric measurements made in a fuel-rich hydrocarbon flame. Known HW factors are contrasted with more complete expressions of recent derivation, and it is found that relative line strength adjustments amount to about a few percent. Such differences result in temperature corrections of less than 1%. This value should be considered for the definition of the ideal thermometric accuracy of the technique but it is of minor importance in comparison with other sources of uncertainty (e. g. Raman line widths) that emerge from the complexity typical of reactive gas mixtures. Copyright (C) 2011 John Wiley & Sons, Ltd. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
coherent anti-Stokes Raman spectroscopy, laser spectroscopy, spectroscopic techniques, combustion diagnostics, thermometry
in
Journal of Raman Spectroscopy
volume
42
issue
10
pages
1843 - 1847
publisher
John Wiley & Sons
external identifiers
  • wos:000297028600004
  • scopus:79961049652
ISSN
1097-4555
DOI
10.1002/jrs.2869
language
English
LU publication?
yes
id
7996f384-5966-422d-983c-51efb5ca653d (old id 2252710)
date added to LUP
2011-12-22 10:06:53
date last changed
2017-07-02 03:53:40
@article{7996f384-5966-422d-983c-51efb5ca653d,
  abstract     = {Purely rotational spectral signals of coherent anti-Stokes Raman scattering (CARS) from nitrogen molecules are studied as a function of the vibration-rotation interaction that weakens the rigid rotor approximation under which the dominant terms of the Raman cross section are calculated. The effect of the vibration-rotation interaction is quantified by means of the Herman-Wallis (HW) factor, and different approaches to its determination are evaluated in terms of their relative contribution to the CARS intensity and thermometric measurements made in a fuel-rich hydrocarbon flame. Known HW factors are contrasted with more complete expressions of recent derivation, and it is found that relative line strength adjustments amount to about a few percent. Such differences result in temperature corrections of less than 1%. This value should be considered for the definition of the ideal thermometric accuracy of the technique but it is of minor importance in comparison with other sources of uncertainty (e. g. Raman line widths) that emerge from the complexity typical of reactive gas mixtures. Copyright (C) 2011 John Wiley & Sons, Ltd.},
  author       = {Bohlin, Alexis and Bengtsson, Per-Erik and Marrocco, Michele},
  issn         = {1097-4555},
  keyword      = {coherent anti-Stokes Raman spectroscopy,laser spectroscopy,spectroscopic techniques,combustion diagnostics,thermometry},
  language     = {eng},
  number       = {10},
  pages        = {1843--1847},
  publisher    = {John Wiley & Sons},
  series       = {Journal of Raman Spectroscopy},
  title        = {On the sensitivity of rotational CARS N-2 thermometry to the Herman-Wallis factor},
  url          = {http://dx.doi.org/10.1002/jrs.2869},
  volume       = {42},
  year         = {2011},
}