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.
© 1983 Optical Society of America
Roland Meynart, "Instantaneous velocity field measurements in unsteady gas flow by speckle velocimetry," Appl. Opt. 22, 535-540 (1983)