Author:Mashaba, Nikiwe P; Griffith, DJDate:Nov 2020Absorption, scattering and refractive index fluctuations are three primary phenomena contributing to optical turbulence. Temperature fluctuations, humidity and air velocity cause variations on both temporal and spatial, in the refractive ...Read more
Author:Dunn, Dwain I; Snedden, Glen C; Roos, T; Hildebrandt, TDate:Sep 2011The design of internally-cooled gas turbine blades requires accurate predictions of distributions of blade temperature values and temperature gradients. This requires accurate predictions of heat transfer distributions from the hot gas (on ...Read more
Author:Trichili, A; Mhlanga, T; Naidoo, Darryl; Dudely, A; Zghal, M; Forbes, ADate:17 Aug 2014We analyze the effect of atmospheric turbulence on the propagation of multiplexed Laguerre Gaussian modes. We present a method to multiplex Laguerre Gaussian modes using digital holograms and decompose the resulting field after encountering ...Read more
Author:Gerber, G; Diedericks, G; Basson, GRDate:Mar 2011Particle image velocimetry scalar measurements were carried out on the body of a stably stratified density current with an inlet Reynolds number of 2,300 and bulk Richardson number of 0.1. These measurements allowed the mass and momentum ...Read more
Author:Chaibi, A; Mafusire, C; Forbes, ADate:Sep 2013The orbital angular momentum of light has been suggested as a means of information transfer over free-space, yet the detected optical vortex is known to be sensitive to perturbation. Such effects have been studied theoretically, in particular ...Read more
Author:Cox, MA; Mphuthi, N; Nape, I; Mashaba, Nikiwe P; Cheng, L; Forbes, ADate:Sep 2020Optical communication is an integral part of the modern economy, having all but replaced electronic communication systems. Future growth in bandwidth appears to be on the horizon using structured light, encoding information into the spatial ...Read more
Author:Mafusire, C; Forbes, A; Michaelis, MM; Snedden, Glen CDate:Jun 2009The 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 has a deleterious ...Read more