Fast and Global Measurement of Free Surface Deformations

Details Fast and Global Measurement of Free Surface Deformations Fast and Global Measurement of Free Surface Deformations

2010-10-16

arxiv.org/abs/1010.3311v1

Physics

Fluid Dynamics

Fluid Dynamics Video for the Gallery of Fluid Motion APS DFD 2010 Long Beach, California, USA

Scientific paper

In this fluid dynamics video, we present an overview of the most important results recently obtained in our group using an optical profilometric technique that allows for single-shot global measurement of free-surface deformations. This system consists of a high-resolution system composed of a videoprojector and a digital camera. A fringe pattern of known characteristics is projected onto the free surface and its image is registered by the camera. The deformed fringe pattern arising from the surface deformations is later compared to the undeformed (reference) one, leading to a phase map from which the free surface can be reconstructed. Two examples are developed: (a) the study of water wave trapped modes and (b) the impact of a drop onto a thin layer of the same liquid.

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