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Proceedings Paper

Real-time color holographic interferometry devoted to 2D unsteady wake flows
Author(s): Jean-Michel Desse; Felix Albe; Jean-Louis H. Tribillon J. L.
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Paper Abstract

A new optical technique based on real time holographic interferometry in trues colors has been implemented around the transonic wind tunnel of the ONERA-Lille center to analyze 2D unsteady wake flows. Tests realized in color interferometry, real time and double exposure, use simultaneously three wavelengths of a continuous waves laser (argon and krypton mixed) and holograms are recorded on silver-halide single-layer panchromatic Slavich PFGO3c plates. The very principle of real-time true color holographic interferometry uses three primary wavelengths (red, green, blue) to record, under no-flow conditions, the interference among the three measurement beams and the three reference beams simultaneously on a single reference hologram. After the holographic plate is developed, it is placed on the test setup again in the position it occupied durng exposure and the hologram is illuminated again by the three reference beams and three measurement beams. A flat, uniform color can then be observed behind the hologram. So a horizontal, vertical, or even circular fringe pattern can be formed and the achromatic central white fringe can be made out very clearly. This single color is used to determine the path difference zero on the interferograms. The flow studied was the unsteady flow downstream of a cylinder placed crosswise in the test section. A sequence of hundred interferograms was recorded on the flow around the cylinder at Mach 0.37. The vortex formation and dissipation phases can a be seen very clearly, along with the fringe beat to either side of the cylinder.

Paper Details

Date Published: 27 May 2003
PDF: 6 pages
Proc. SPIE 4933, Speckle Metrology 2003, (27 May 2003); doi: 10.1117/12.516649
Show Author Affiliations
Jean-Michel Desse, Office National d'Etudes et Recherches Aérospatial (France)
Felix Albe, Institut Franco-Allemand de Recherches de Saint-Louis (France)
Jean-Louis H. Tribillon J. L., Service Recherche Etude Amont (France)

Published in SPIE Proceedings Vol. 4933:
Speckle Metrology 2003
Kay Gastinger; Ole Johan Lokberg; Svein Winther, Editor(s)

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