On the sensitivity of rotational CARS N-2 thermometry to the Herman-Wallis factor
Författare
Summary, in English
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.
Avdelning/ar
Publiceringsår
2011
Språk
Engelska
Sidor
1843-1847
Publikation/Tidskrift/Serie
Journal of Raman Spectroscopy
Volym
42
Issue
10
Dokumenttyp
Artikel i tidskrift
Förlag
John Wiley & Sons Inc.
Ämne
- Atom and Molecular Physics and Optics
Nyckelord
- coherent anti-Stokes Raman spectroscopy
- laser spectroscopy
- spectroscopic techniques
- combustion diagnostics
- thermometry
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 1097-4555