Instantaneous velocity field measurements in unsteady gas flow by speckle velocimetry.
An application of speckle photography techniques to unsteady gas flow measurements is presented. The instrumentation developed for the analysis of double-exposure photographs by digital signal processing is described. It is shown that 2-D velocity fields can be measured even when the flow is not perfectly 2-D. Accuracy and limitations of these techniques are discussed.
Meynart
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Universite Libre de Bruxelles, Service des Milieux Continue, 1050 Bruxelles, Belgium.