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  • 42.65  (1)
  • Multiple-reflection cell  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    A multiple-reflection cell suited for absorption measurements in shock tubes (1994)
    Springer
    Shock waves 4 (1994), S. 51-53 
    Details
    ISSN: 1432-2153
    Keywords: Chemical kinetics ; Detection sensitivity ; Multiple-reflection cell ; UV absorption spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics , Technology
    Notes: Abstract The improvement of the detection limit in optical concentration measurements by means of multiple-reflection cells (MRC) has become a well established method in absorption spectroscopy. To apply such an experimental method to shock tubes, several technical problems have to be solved. The use of special optical cells showing mechanical ruggedness is required. In this report we present such a MRC designed for a cylindrical shock tube with an inner diameter of 100 mm. By means of 8 mirrors (optical coated stainless steel) the absorption length has been increased by almost one order of magnitude (863 mm) while the optical path is kept in one plane. The use of fixed flat mirrors provides a very high mechanical stability, which facilitates the application to shock tubes. The first experimental results with this MRC were obtained by measuring the thermal decomposition of O3 behind incident shock waves using an UV laser beam. A direct comparison to the signals simultaneously detected by the use of the conventional absorption length (i.e. the tube diameter of 100 mm) documents the suitability of this MRC for applications in chemical kinetics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01414633
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  • 2
    Electronic Resource
    Electronic Resource
    Spatio-temporal structure formation and self-diffraction in CdS using laser-induced thermal gratings (1991)
    Springer
    Applied physics 52 (1991), S. 255-260 
    Details
    ISSN: 1432-0630
    Keywords: 78.20Nv ; 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The semiconductor CdS is well known to show various kinds of photo-thermal and photo-electric optical nonlinearities. We present here to our knowledge first results of spatiotemporal structure formation using laser-induced thermal gratings in CdS. By the means of an optical multi-channel analyzer the spatial resolution of transverse dynamic switching processes was observed directly. Spatially and time resolved self-diffracted signals were measured in the far-field. The experimental results agree very well with calculations obtained by solving the heat-flow equation and using a fast Fourier transformation. The calculations verify the experimental parameters, in particular the thermal diffusivity D≈0.1 cm2/s at room temperature. To obtain a better transverse structuring, CdS samples were also investigated which were fixed on a sapphire substrate for longitudinal heat sinking.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324587
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