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  • 1
    Electronic Resource
    Electronic Resource
    Laser-Induced Fluorescence Detection of OH in a Flame Near 268 nm
    Amsterdam : Elsevier
    Journal of Molecular Spectroscopy 166 (1994), S. 486-488 
    Details
    ISSN: 0022-2852
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1006/jmsp.1994.1210
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  • 2
    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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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    The application of a raman-shifted tunable KrF excimer laser for laser-induced fluorescence combustion diagnostics (1992)
    Springer
    Applied physics 55 (1992), S. 381-387 
    Details
    ISSN: 1432-0649
    Keywords: 33.00 ; 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Four wavelength extensions have been investigated by stimulated Raman scattering in hydrogen or deuterium gas of the 248 nm fundamental output of a narrow-band tunable KrF excimer laser. They have been used to acquire laser-induced fluorescence spectra of NO and OH in flames at atmospheric pressure. NO is detected in relatively high rotational states within the γ-band electronic system at 225 nm. OH was excited at 291.5 nm in the (1–0), at 313 nm in the (1–1) and at 268.5 nm in the predissociative (3–1) band of the 2Σ–2Π electronic band system, respectively. Prospects of 2D imaging for concentration and temperature measurements in flames using these wavelength extensions are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00333086
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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    Characterisation of a spark ignition system by planar laser-induced fluorescence of OH at high repetition rates and comparison with chemical kinetic calculations (2000)
    Springer
    Applied physics 70 (2000), S. 287-294 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 07.50.-e; 07.60.-j; 47.11.+j
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. This study reports the application of a novel, high speed laser-detector system for the time-resolved study of flame propagation in a well-controlled spark ignition system. The ignition system allowed full and reproducible control over the energy deposited during breakdown and the ensuing arc discharge of the spark plasma. Ignition was performed in a closed vessel which was filled with stoichiometric mixtures of methane and air. Four sequential snapshots of two-dimensional OH distributions were recorded during single ignition events by the use of planar laser-induced fluorescence (PLIF). From these OH distributions flame front velocities have been extracted with an accuracy of better than 2%. One-dimensional numerical simulations of the ignition event including detailed chemistry and transport processes have been performed. Experimental results and results from the simulations have been compared to each other with respect to flame front velocities as well as spatial concentration profiles of OH radicals. In general a good agreement was obtained. In this way the ignition system was carefully characterised.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050047
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  • 7
    Electronic Resource
    Electronic Resource
    Flame growth and wrinkling in a turbulent flow (2000)
    Springer
    Applied physics 71 (2000), S. 711-716 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 47.27.-i; 42.62.-b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. High-speed planar laser-induced fluorescence (PLIF) and 3-D large eddy simulations (LES) are used to study turbulent flame kernel growth, wrinkling and the formation of separated flame pockets in methane/air mixtures. Turbulence was effected by a set of rotary fans situated in a cylindrical enclosure. Flame wrinkling was followed on sequential 2-D OH images captured at kHz repetition rates. Under stoichiometric conditions and low turbulence levels the flame kernel remains singly connected and close to spherical in shape. By increasing turbulence or reducing the stoichiometry of the mixture the formation of separated pockets could be observed and studied. The mechanisms behind these phenomena are investigated qualitatively by LES of a level-set G-equation describing the flame surface propagation in turbulent flows.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400000425
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  • 8
    Electronic Resource
    Electronic Resource
    Comparison of two-photon excitation schemes for CO detection in flames (2000)
    Springer
    Applied physics 71 (2000), S. 689-696 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 33.50.Dq; 33.80.Rv; 39.30.+w
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Two approaches for CO concentration measurement in premixed and non-premixed hydrocarbon/air flames based on two-photon laser excitation and subsequent detection of induced fluorescence are compared in detail. It is shown that excitation of the C1 Σ??X1 Σ + band of CO indicates significant advantages over the commonly used B1 Σ??X1 Σ + band of the Hopfield–Birge system with respect to crosstalk of simultaneously excited laser-induced fluorescence of C2. The measurements demonstrate that both approaches give comparable signal intensities and are similarly influenced by multi-photon ionization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400000390
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  • 9
    Electronic Resource
    Electronic Resource
    Time and spatially resolved LIF of OH A 2Σ+(v′=1) in atmospheric-pressure flames using picosecond excitation (1993)
    Springer
    Applied physics 57 (1993), S. 85-87 
    Details
    ISSN: 1432-0649
    Keywords: 07.60 ; 42.30 ; 82.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract One dimensional imaging of fluorescence lifetimes was performed directly for the first time in a premixed, atmospheric-pressure ethylene/air flame. A picosecond laser system based on the microscope-DFDL (Distributed-Feedback Dye Laser) was used for excitation of OH. The method involves imaging a section of the flame onto the streak camera and evaluating a series of windows, each with a certain number of channels of the CCD-multichannel plate. In this way, changes in quenching efficiency can be monitored along a horizontal line through the flame. These direct lifetime measurements confirm the observations of relative lifetimes previously obtained for this flame by saturated 2D-LIF.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324104
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