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  • Articles: DFG German National Licenses  (7)
  • 82.40  (7)
Source
  • Articles: DFG German National Licenses  (7)
Material
Years
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Correction of imaging errors in spatially resolved laser scattering experiments in flames (1988)
    Springer
    Applied physics 45 (1988), S. 33-36 
    Details
    ISSN: 1432-0649
    Keywords: 82.40 ; 42.30 ; 42.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Imaging errors in spatially resolved measurements using laser scattering techniques in flames are discussed. An experimental method based on Fourier deconvolution to correct the measurements for the imaging errors is presented. The method is especially important when large gradients are recorded with lowf-number lenses in order to obtain a sufficient signal-to-noise ratio. The technique is demonstrated experimentally on OH profiles measured by laser-induced fluorescence in an atmospheric acetylen-oxygen flame.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00692338
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Two-photon degenerate four-wave mixing (DFWM) for the detection of ammonia: Applications to flames (1993)
    Springer
    Applied physics 56 (1993), S. 281-286 
    Details
    ISSN: 1432-0649
    Keywords: 42.65.Ky ; 82.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two-photon Degenerate four-wave mixing (DFWM) has been used for the detection of ammonia in a cell and in an atmospheric pressure flame. The NH3 molecules were excited from the ground state X to either the C' or the B state and the DFWM signal was recorded simultaneously with the laser-induced fluorescence signal, originating from the C′-A and B-A transitions, respectively. During the flame experiments sequential measurements of NH3 and OH in an NH3/O2 flame were also performed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325217
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Simultaneous, spatially resolved monitoring of C2 and OH in a C2H2/O2 flame using a diode array detector (1982)
    Springer
    Applied physics 29 (1982), S. 93-97 
    Details
    ISSN: 1432-0649
    Keywords: 33 ; 42.60 ; 82.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Simultaneous, spatially resolved monitoring of C2 and OH in a flame is reported. Data could be captured in 10 ns employing two pulsed lasers and a diode array detector. Laser-production of C2 was also observed and a kinetic study of such molecules was performed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00692769
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Calibration of imaging laser-induced fluorescence measurements in highly absorbing flames (1987)
    Springer
    Applied physics 42 (1987), S. 97-102 
    Details
    ISSN: 1432-0649
    Keywords: 82.40 ; 42.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It has been described earlier that imaging measurements of laser-induced fluorescence (LIF) in flames can be calibrated to number densities with an integrated absorption measurement provided the integrated absorption is small. In this paper a method is presented that extends the technique to flames with substantial absorption, improves the number density determination and allows the experimental parameters to be chosen more freely. The method is based on an iterative computer procedure that reconstructs the 1-D spatially resolved absorption profile from laser measurements of the 1-D spatially resolved LIF and the integrated absorption of the laser beam. The technique is experimentally demonstrated by measurements of OH number densities in atmospheric flames. It is potentially a single-pulse method. Other applications of the iterative procedure are mentioned.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694817
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Application of a pulsed laser for soot measurements in premixed flames (1989)
    Springer
    Applied physics 48 (1989), S. 155-164 
    Details
    ISSN: 1432-0649
    Keywords: 78.35 ; 82.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A pulsed Nd: YAG laser has been used to perform scattering/extinction measurements in flat, premixed methane/oxygen flames to determine soot particle sizes, number concentrations and soot volume fractions. A discussion is given on accuracies in these determinations with respect to experimental and theoretical parameters. Absorptions were measured through a referencing method which yielded a single-pulse relative standard deviation in the normalized signal of 0.7%. The incident laser fluence was kept below 0.1 J/cm2 in the focusing point in the flame to avoid soot vaporization effects. Interference in the measurements from polyaromatic hydrocarbons (PAH) is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00692141
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    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Carbon atom fluorescence and C2 emission detected in fuel-rich flames using a UV laser (1991)
    Springer
    Applied physics 52 (1991), S. 371-375 
    Details
    ISSN: 1432-0649
    Keywords: 42.55 ; 82.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Laser-induced fluorescence from carbon atoms, excited at the two-photon resonances around 280 nm, has been detected in fuel-rich hydrocarbon flames together with Swan band emission from the C2 radical, which was non-resonantly excited at the same wavelengths. The emission from the C atom and from the C2 molecule exhibited several similarities, indicating a possible common photo-chemical origin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325152
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Single-pulse two-dimensional temperature imaging in flames by degenerate four-wave mixing and polarization spectroscopy (1994)
    Springer
    Applied physics 59 (1994), S. 37-43 
    Details
    ISSN: 1432-0649
    Keywords: 42.65 ; 82.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We introduce a novel and simple experimental arrangement for single-pulse two-dimensional temperature mapping in flames by the coherent imaging techniques, degenerate four-wave mixing and polarization spectroscopy, utilizing a dual-wavelength dye laser and a diffraction grating. Each pulse of this dye laser consists of two wavelengths which were tuned to resonance with two different rotational transitions in theQ 1 branch of theA 2 ∑−X 2 ∏(0, 0) band of the OH radical. A typical coherent imaging geometry where a sheet-shaped pump beam crossed an unfocused probe beam, was used. The two generated images of OH signal distributions were spatially separated by a diffraction grating and simultaneously detected on a single CCD chip. The two-dimensional single-pulse temperature map was extracted from these images. The precision of the methods is examined and a comparison between degenerate four-wave mixing and polarization spectroscopy is made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081726
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    Paper (German National Licenses)
    Fulltext
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