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Browsing by Author "Michaelis, MM"

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  • Snedden, Glen C; Forbes, A; Mahlatse, ACK; Mafusire, C; Michaelis, MM (2006-07)
    Slides on: Spinning Pipe Gas Lens; Focal Length; Refractive Index; Gas Dynamics; Guess at the gas dynamics; Density Profile; Flow Profile; Rosby Waves; Rayleigh–Taylor Instabilities
  • Mafusire, C; Forbes, A; Snedden, Glen C; Michaelis, MM (International Society for Optical Engineering (SPIE), 2007)
    A heated horizontal spinning pipe causes gases inside it to assume dynamics resulting in a graded index lens – a spinning pipe gas lens (SPGL). A CFD model is presented which shows that gas exchanges of the SPGL with the ...
  • Mafusire, C; Forbes, A; Snedden, Glen C; Mahlase, ACK; Michaelis, MM; Mathuthu, M (2006-07)
    When a heated pipe is rotated, the dynamics of the gas inside exhibit properties reminiscent of a solid-state positive lens. The properties are a result of a parabolic distribution of refractive index in the pipe which is ...
  • Michaelis, MM; Forbes, A; Klopper, W; Bencherif, H; Jolivet, S; Moorgawa, R; McKenzie, E; Turner, G (Academy of Science of South Africa, 2006-07)
    Three sets of laser propulsion experiments have been conducted in South Africa. The first, on the MLIS kilowatt CO2 laser at Pelindaba, gave a surprisingly good result but could not be repeated after the laser chain was ...
  • Michaelis, MM; Forbes, A (Academy of Science of South Africa, 2006-07)
    Early proposals for laser propulsion were surveyed. Propulsion theory and laboratory momentum coupling experiments demonstrate how it is possible to choose the target material so as to optimize payload efficiency, with a ...
  • Michaelis, MM; Forbes, A; Bingham, R; Kellett, BJ; Mathye, A (SPIE, 2008-04)
    A variety of laser applications in space, past, present, future and far future are reviewed together with the contributions of some of the scientists and engineers involved, especially those that happen to have South African ...
  • Michaelis, MM; Forbes, A; Conti, A; Nativel, N; Bencherif, H; Bingham, R; Kellett, B; Govender, K (The International Society for Optical Engineering, 2006-06-14)
    Non-solid and non-rigid optics employ gas and liquid transmission and reflection, as well as flexible membranes to influence laser beams, laser driven particle beams and harmonic generators. Some examples are acoustic ...
  • Mafusire, C; Forbes, A; Michaelis, MM; Snedden, Glen C (2010-08)
    Gas lenses work on the basis that aerodynamic media can be used to generate a graded refractive index distribution which can be used to focus a laser beam. Examples of these are the spinning pipe gas lens (SPGL) and the ...
  • Mafusire, C; Forbes, A; Michaelis, MM; Snedden, Glen C (Optical Society of America, 2008-06)
    If a heated pipe is rotated about its axis, a density gradient is formed which results in the pipe acting as a graded index lens. In this study the authors revisit the concept of a spinning pipe gas lens and for the first ...
  • Mafusire, C; Forbes, A; Snedden, Glen C; Michaelis, MM (Academy of Science of South Africa, 2008)
    The graded index (GRIN-like) medium generated by gas inside a heated steel pipe when rotated about its longitudinal axis has the ability to focus a laser beam. While the effective focal length of such a system has previously ...
  • Mafusire, C; Forbes, A; Michaelis, MM; Snedden, Glen C (2009-06)
    The graded index (GRIN-like) medium generated by a gas inside a heated pipe when it is rotated about its longitudinal axis has the ability to focus a laser beam. However, recent research has shown that the medium generated ...