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Instantaneous velocity field measurements in unsteady gas flow by speckle velocimetry

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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.

© 1983 Optical Society of America

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