Abstract: Device for analyzing a polyphase mixture via a light beam backscattered by said mixture, comprising: a vertical cell capable of containing the polyphase mixture; means for emitting a light beam in the direction of the cell, in such a way that the light beam lies in a vertical plane (PV) covering at least the height (hc) of the cell containing the polyphase mixture; means for receiving a light beam backscattered by the polyphase mixture, covering the height of the backscattered light beam, extending over the height (hc) of the cell containing the polyphase mixture; optical conjugation means placed between the cell and the means for receiving the backscattered beam, the receiving means comprising a matrix center forming a surface for receiving the backscattered beam, lying in vertical and horizontal directions; and means for analyzing the backscattered beam received by the matrix sensor, the light beam emitted in the direction of the cell, adopting, at its interface between the internal surface of the wall of t

Abstract: A method for quantitatively determining the viscoelastic properties of a complex medium with suspended particles in suspension, which involves: characterizing the medium opacity by measuring the medium's transport length l*; introducing a sample of the medium into a flask; placing the flask in a thermostatically-controlled measuring chamber; projecting a coherent light beam on the sample and detecting scattered light as a series of sequenced images; analyzing the movement of particles based on time by calculating the inter-image distance d2 and the ratio d2/d2max; and establishing an analytical expression E putting into direct relationship, the measured l*, the ratio d2/d2max and the mean square displacement MSD for the purpose of calculating the medium's viscous and elastic moduli.

Abstract: Method and device for detecting and analyzing movement in a scattering medium, by: projecting a coherent light towards the scattering medium; performing a spatial and temporal sampling of the electromagnetic field of scattered light, in order to obtain a plurality of images of the electromagnetic field; and analyzing the speckle grains resulting from the images obtained from the spatial and temporal sampling of the electromagnetic field of the scattered light, in order to detect and analyze a movement in the scattering medium, the speckle grain analysis step including a step of analyzing the inter-image distance.

Abstract: A method for measuring a light flux backscattered by a dispersed medium located on one first side of a wall, by interaction with a plurality of light rays emitted from the second opposite side of the wall where the dispersed medium is located and towards the latter, the plurality of light rays being adapted to pass through the wall and being backscattered at least partly by the dispersed medium towards reception elements arranged on the second side of the wall. The method includes: emitting the plurality of light rays towards the dispersed medium and through the wall so as to form a backscattering spot having a central disc whose center corresponds to the luminous barycenter of the spot and whose radius is equal to four times the maximum free travel path (1*max) of the dispersed medium.