Method and Device for the Analysis of Movement in a Scattering Medium

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;
• 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 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,
• - 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 inter-image distance.