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  • 1995-1999  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Polarization-spectroscopic measurement and spectral simulation of OH (A 2 Σ−X 2 Π) and NH (A 3 Π−X 3 Σ) transitions in atmospheric pressure flames (1995)
    Springer
    Applied physics 61 (1995), S. 421-427 
    Details
    ISSN: 1432-0649
    Keywords: 33.00 ; 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Polarization spectroscopy has been used to investigate the electronic bands of OH (A 2 Σ-X 2 Π) and NH (A 3 Π-X 3 Σ) radicals generated in atmospheric pressure flames. The pump-beam intensity dependence of the polarization-spectroscopy signals of isolated lines in theR branches has been studied. It was found that significant saturation is noticeable for pump-beam intensities as low as 0.1 MW/cm2. A detailed theoretical description inluding laser-bandwidth convolutions has been developed to model unsaturated polarization spectra of OH and NH. For OH, temperature evaluations have been performed in methane/air flames from fits to experimentalR 1 band head spectral structures. The results are critically dependent on the degree of saturation in experimental spectra, instrumental bandwidth and the assumed coupling cases in the calculation of line-strength parameters. It is shown that saturation leads to an error of more than 60% in the temperature evaluation when a pump-beam intensity of 1 MW/cm2 is used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081270
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Multiplex polarization spectroscopy of OH for flame thermometry (1997)
    Springer
    Applied physics 65 (1997), S. 633-637 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 42.65.33.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 2 Σ-X2Π(0,0) band system. High resolution polarization spectra were also recorded in the same flame using a conventional, frequency scanned, narrow linewidth dye laser. Absorption effects were found to produce significant systematic errors in the temperatures derived from the unsaturated spectra produced by both multiplex and narrow linewidth scanning techniques. After correction for absorption effects, temperatures were derived from the single-shot multiplex spectra with a precision of 4% which agreed well with values obtained from scanned spectra and from the calculated adiabatic temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050325
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Thermal grating and broadband degenerate four-wave mixing spectroscopy of OH in high-pressure flames (1998)
    Springer
    Applied physics 67 (1998), S. 667-673 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 42.62.Fi; 84.40.Py
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 2 ∑–X2Π(0,0) band of OH has been studied in premixed methane/air flames using a cw Ar+ laser probe. Measurements of flame temperature and pressure were derived from fits of theoretical simulations to the observed time variation of signals over a pressure range of 10 to 40 bar and for different stoichiometry that were in agreement with independent measurements using N2 CARS and predictions of a one-dimensional flame calculation. Broadband DFWM spectra in the same band of OH were observed up to a pressure of 9 bar, above which signals were obtained only from scattering from thermal gratings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050563
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    Paper (German National Licenses)
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