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15 September 2006 Real-time colour Denisyuk setup for analyzing high-speed flows
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Proceedings Volume 6341, Speckle06: Speckles, From Grains to Flowers; 63411P (2006)
Event: Speckle06: Speckles, From Grains to Flowers, 2006, Nimes, France
The feasibility of Real-time Colour Holographic Interferometry (RCHI) has been shown for several years at ONERA to analyze high speed two-dimensional flows. The light source of the interferometer is made of three different wavelengths (one red, one green and one blue) and panchromatic holograms are recorded by transmission. The method has been successfully applied in the ONERA wind tunnel to analyze the two dimensional wake flow around a circular cylinder. High speed interferograms of the unsteady wake flow have been obtained at a high framing rate of 35,000 frames per second. The authors propose to extend this method for analyzing three dimensional flows. In order make that, Real-time Colour Denisyuk Holographic Interferometry (RCDHI) has been developed. The feasibility of the optical setup is shown in one direction sight, the aim being to reproduce the same optical setup along several sight directions, each shifted by a given angle. Contrary to the optical setup developed for the analysis of the 2D flows, in the one proposed for 3D flows, reflection holograms are used. In the case of reflection holograms, the diffraction efficiency is strongly influenced by the variations in the gelatine thickness produced during the holograms treatment. Solutions are proposed to control the gelatine shrinkage and the first results obtained in wind tunnel are shown in one sight of view. High speed interferograms of unsteady wake flow around a circular cylinder have been obtained in narrowed fringes and uniform background at Mach 0.45.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jean Michel Desse and Jean-Louis Tribillon "Real-time colour Denisyuk setup for analyzing high-speed flows", Proc. SPIE 6341, Speckle06: Speckles, From Grains to Flowers, 63411P (15 September 2006);

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