Method and device for the analysis of movement in a scattering medium
AssigneeFormulaction
InventorsPatrick Snabre, Laurent Brunel
Life of this patent
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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.
Claims20
Method of detecting and analyzing movement in a scattering medium, said method comprising:
- projecting a coherent light towards said scattering medium;
- performing a spatial and temporal sampling of the electromagnetic field of the light scattered by said scattering medium, in order to obtain a plurality of images of said electromagnetic field, said plurality of images providing a plurality of speckle grain images which are representative with regard to the spatial sampling, at a given instant, of a state of the scattering medium, and representative in respect of the temporal sampling, of the evolution over time of the scattering medium;
- and
- analyzing the speckle grains resulting from said images obtained from said spatial and temporal sampling of the electromagnetic field of the scattered light, in order to detect and analyse a movement in said scattering medium,
- wherein the speckle grain analysis step comprises a step consisting in analyzing the vectorial inter-image distance.
Device for detecting and analyzing movement in a scattering medium, which comprises:
- means (1) for projecting a coherent light towards said 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 said scattering medium, in order to obtain a plurality of images of said electromagnetic field, said plurality of images providing a plurality of speckle grain images which are representative with regard to the spatial sampling, at a given instant, of a state of the scattering medium, and representative in respect of the temporal sampling, of the evolution over time of the scattering medium,
- means (3) for observing said images of the electromagnetic field of the scattered light;
- means (4) for analyzing the speckle grains resulting from said images;
- and
- means for analyzing the vectorial inter-image distance.
Dependencies are inferred from the claim text.