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  • 1
    Electronic Resource
    Electronic Resource
    A study of CARS nitrogen thermometry at high pressure (1990)
    Springer
    Applied physics 51 (1990), S. 31-38 
    Details
    ISSN: 1432-0649
    Keywords: 42.65c ; 78.30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The accuracy of CARS N2 thermometry has been assessed using carefully measured experimental data at high pressures for the temperature range 295 to 870 K and pressure range 1–20 bar. Excellent agreement between calculated and experimental spectra was achieved using statistically based fitting laws to model rotational relaxation. Temperature errors of within ±60 K were achieved using the MEG fitting law, and within ±30 K using an extension to the model (XMEG). Results of separate ab initio IOS calculations with ECS corrections for rotational relaxation gave good overall agreement but did not model the structure of the motionally narrowed spectra as well as the empirical models. The various models were also compared with some complementary data measured by DLR, Stuttgart in their high pressure burner for pressures up to 40 bar. This study also investigated the sensitivity of CARS thermometry to pressure; in certain regions a significant reduction in sensitivity was found. Other key factors investigated include nonlinearities in the intensified diode array detector.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332321
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  • 2
    Electronic Resource
    Electronic Resource
    Quantitative CARS spectroscopy of the ν1 band of water vapour (1992)
    Springer
    Applied physics 54 (1992), S. 103-108 
    Details
    ISSN: 1432-0649
    Keywords: 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The accuracy of CARS thermometry for H2O vapour has been assessed under carefully controlled conditions for the temperature range 295 to 900 K and the pressure range 0.0066 to 2.7 atm. Excellent agreement between theory and experiment was achieved for line-broadening regimes ranging from Doppler broadening to motional narrowing. Various models for rotational energy transfer and line-broadening were compared and where pressure broadening dominated, excellent agreement was achieved with a simple linewidth model, dependent only on temperature and pressure. Excellent agreement was also achieved using either energy or angular momentum based relaxation models to model motionally narrowed spectra in the pressure range up to 2.7 atm. However, good agreement between theory and experiment depended on the inclusion of state mixing correction factors, and good thermometry accuracy at high temperature was sensitive to the value assumed for the water molecular polarisability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331880
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