Computer Science
Scientific paper
Oct 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996spie.2828..256g&link_type=abstract
Proc. SPIE Vol. 2828, p. 256-265, Image Propagation through the Atmosphere, J. C. Dainty; Luc R. Bissonnette; Eds.
Computer Science
Scientific paper
Two high-speed cameras were used to generate a set of measurements of laser light propagating through a high- Reynolds-number mixing layer. A channel-flow mix of helium gas at 4.5 m/s and nitrogen gas at 1.0 m/s induced optical perturbations which were sensed using shadowgraph and wave front slope measurements. Phase surfaces were reconstructed from the wave front slopes. An ensemble of 255 frame- registered measurements were obtained for each sensing technique at eight aperture locations in the flow, spaced between 0 cm and 15 cm from the exit nozzle of the turbulence generator. A technique is introduced which computes an array of correlation coefficients over a two- dimensional sliding window for various temporal separations as a means to quantify frozen flow properties. For the wave front phase, the peaks of the correlation coefficient arrays degraded by 30 to 60 percent for 1 ms separation, indicative of limited validity in a frozen flow assumption for this type of flow.
Gardner Patrick J.
Roggemann Michael C.
Welsh Byron M.
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