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Holographie numérique pour la PTV - Digital holography for Particle Tracking Velocimetry

[ mercredi 28-05-2008 13:00 | français ]Holographie numérique pour la PTV - Digital holography for Particle Tracking Velocimetry Corinne FOURNIER Laboratoire Hubert Curien UMR 5516
Résumé :
I propose to give a presentation of our recent results in particle holography in two parts: a first part that focuses on hologram processing issues and the "inverse problems" approach we suggested; and a second part to present experimental results obtained on water droplets. After a short introduction, that justifies the use of digital holograms for time-resolved 3D measurements of particles locations, the classical approach to 3D reconstruction of a hologram will be presented. Such approaches suffer from artefacts that can be suppressed by changing the processing approach. An "inverse problems" approach, that leads to large accuracy improvements and the possibility for field of view enlargement will be explained. A description of the experiments ran in Lyon of water droplets tracking will then be given. A simple experiment for digital holography accuracy assessment and a comparison of digital holography to Phase Doppler Anemometry will be presented. Finally, preliminary results of particle tracking in turbulence will be shown