Method and device for the analysis of movement in a scattering medium
First Claim
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1. 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.
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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.
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Citations
20 Claims
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1. Method of detecting and analyzing movement in a scattering medium, said method comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Device for detecting and analyzing movement in a scattering medium, which comprises:
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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. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification