International audienceWe present a novel approach which allows simultaneous measurement of the velocity field and the interface profile close to a composite liquid-gas and solid-gas interface. The proposed scheme is the method of choice for the characterization of those flows where the velocity field is highly dependent on the actual shape and position assumed by liquid-gas and liquid-solid interfaces. The new method is based on the digital processing of microscopy images of a flow seeded with fluorescent passive tracers. The relative position and the shape of both liquid-gas and liquid-solid interfaces can be determined with a resolution of few tens of nanometers. The results for the liquid-solid interfaces are also compared to an additional detection method we devised to accurately determine the absolute position of the solid walls

. Using Surface Evolver to measure pressures and energies of real 2D foams submitted to quasi-static deformations. Colloids and Surfaces A: Physicochemical and Engineering Aspects, Elsevier, 2015Elsevier, , 468, pp.193-200. 10.1016Elsevier, /j.colsurfa.2014 Using Surface Evolver to measure pressures and energies of real 2D foams submitted to quasi-static deformations AbstractStatic 2D foams have the interesting property that their energy is measurable by summing up the total length of their films, so that a simple optical picture of a 2D foam should enable measurement of its energy and other quantities such as its bubbles' pressures. This operation is of course unrealisable in most experiments since the optical resolution limits the accuracy of length measurements. Here we show that using image analysis tools alongside an iterative procedure based on the Surface Evolver (1) to analyse optical images of a 2D foam we are able to measure accurately its energy and its bubbles' pressures up to a single multiplying factor. We validate this procedure by comparing experimental measurement of work and pressure on a 2D foam experiencing a quasi-static localised deformation with the energy and pressures computed using our procedure.