title: Instantaneous velocity field measurements in unsteady gas flow by speckle velocimetry.
abstract: 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.
authors.affiliation: Universite Libre de Bruxelles, Service des Milieux Continue, 1050 Bruxelles, Belgium.
authors.forename: R
authors.initials: R
authors.lastname: Meynart