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Motion detection system and method

  • US 8,638,991 B2
  • Filed: 07/21/2008
  • Issued: 01/28/2014
  • Est. Priority Date: 07/26/2007
  • Status: Active Grant
First Claim
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1. A method for use in motion detection of an object, the method comprising:

  • providing a system comprising a source of a beam of coherent light and an imaging system capable of being focused on a plane displaced from an intersection of the beam and a field of view of the imaging system and being in a far field from said intersection;

    operating said system for illuminating an object by the beam of coherent light, and imaging the coherent speckle pattern, originated at and propagating from the object, while focusing the imaging system on a plane being in a far field of the object and being located further than D2/4λ

    from the object, D and λ

    being respectively a size and a wavelength of the speckle pattern at the object.

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