METHOD AND DEVICE FOR THE ANALYSIS OF MOVEMENT IN A SCATTERING MEDIUM

摘要

The invention relates to a method of detecting and analysing movement in a scattering medium. The inventive method consists in: projecting a coherent light (1) towards the scattering medium (5); performing a spatial and temporal sampling of the electromagnetic field of the light (6) scattered by the scattering medium, in order to obtain a plurality of images of said electromagnetic field; and analysing 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 analyse a movement in the scattering medium, said speckle grain analysis step comprising a step consisting in analysing the inter-image distance. The invention also relates to a device for detecting and analysing movement in a scattering medium. The inventive device comprises: means (1) for projecting a coherent light towards the scattering medium (5); matrix sensor means (2) which can be used to perform a spatial and temporal sampling of the electromagnetic field of the light (6) scattered by the scattering medium, in order to obtain a plurality of images of the electromagnetic field; means (3) for observing the images of the electromagnetic field of the scattered light; means (4) for analysing the speckle grains resulting from said images; and means for analysing the inter-image distance.