1992 | OriginalPaper | Chapter
Direct Measurement of the Density Field Using High Speed Differential Interferometry
Authors : J. M. Desse, J. C. Pegneaux
Published in: Flow Visualization VI
Publisher: Springer Berlin Heidelberg
Included in: Professional Book Archive
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The optical method presented here is based on Wollaston biprism differential interferometry using a white light source. It yields high-speed, instantaneous interferograms which directly display the isochoric lines of an instationary, two-dimensional flow. The setup is equivalent to conventional separate-reference interferometric systems, but remains differential since one of the beams — the one used as reference — lies inside the undisturbed upstream flow. The method was used to get instantaneous, high speed displays of the instationary flow around a cylinder placed across the test section.