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  • 1990-1994  (2)
  • 33.20.Lg  (1)
  • Cat
  • Organic Chemistry
  • 1
    Electronic Resource
    Electronic Resource
    Temperature measurement using degenerate four-wave mixing with non-saturating laser powers (1994)
    Springer
    Applied physics 58 (1994), S. 459-466 
    Details
    ISSN: 1432-0649
    Keywords: 82.40.Py ; 07.20.Dt ; 07.65.-b ; 33.20.Lg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report the use of Degenerate Four-Wave Mixing (DFWM) in the OHA 2 Σ + ←X 2 ∏ (υ′ = 0 ←υ″ = 0) band for temperature determination in a propane/air flame using laser powers below the saturation level. We show that at these low power levels the dependence of the signal on the dipole moment for the transition has to be established before meaningful temperature data can be obtained. This presents a paradox in that the temperature has to be known before the form of the dependence on the dipole moment can be determined. Solutions to this paradox are presented. We also show that absorption of the laser beams in this OH band system cannot be neglected and that failure to correctly account for the absorption leads to a large over estimate of the flame temperature. Furthermore, we show that the accuracy of the absorption-corrected temperature is critically dependent on the accuracy with which the measurement position within the flame is known. Finally, the temperature calculated from DFWM spectra using the correct dipole moment power and absorption is compared to the temperatures obtained using Laser-Induced Fluorescence (LIF) and Coherent Anti-Stokes Raman Spectroscopy (CARS).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081076
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Use of plaid patterns to distinguish the corticofugal and direct retinal inputs to the brainstem optokinetic nystagmus generator (1991)
    Springer
    Experimental brain research 86 (1991), S. 324-332 
    Details
    ISSN: 1432-1106
    Keywords: Vision ; Optokinetic nystagmus ; Eye movements ; Plaids ; Brainstem ; Motion perception ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We have recorded the direction of optokinetic nystagmus (OKN) elicited by moving plaid patterns in order to dissociate the pathways that mediate horizontal OKN. The plaids used comprised two drifting sinusoidal gratings arranged such that their individual directions of drift were very different from the direction of coherent motion of the overall pattern. The direction of OKN with binocular viewing was close to the mean of the component directions, suggesting a dominant influence of cortical visual neurons that respond to oriented one-dimensional components of the image. But the direction of OKN was consistently shifted slightly towards the direction of motion of the overall pattern, suggesting a secondary influence responsive to pattern direction. OKN recordings obtained during monocular viewing suggest that this secondary influence reflects the direct retinal pathway to the brainstem structures mediating OKN.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00228955
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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