Method and system for generating substantially uniform speckle patterns
AssigneeAvago Technologies ECBU IP (Singapore) Pte. Ltd.
InventorsSusan Hunter, Annette Grot
Life of this patent
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Abstract
A diffractive optical element is positioned in an optical path between a coherent light source and a surface. The diffractive optical element is designed to disperse the light across one or more spots on the surface in a manner designed to create speckle patterns having substantially uniform intensities.
Claims16
A system for illuminating a surface to generate one or more speckle patterns having substantially uniform intensities and sizes, comprising:
- a spatially coherent light source;
- and
- a diffractive optical element disposed in an optical path between the coherent light source and the surface to disperse the light and control the intensities and sizes of each speckle pattern.
A system for illuminating a surface to generate one or more speckle patterns having substantially uniform intensities and sizes, comprising:
- a spatially coherent light source;
- a diffractive optical element disposed in an optical path between the coherent light source and the surface to disperse the light and control the intensities and sizes of the one or more speckle patterns;
- and
- a detector disposed to receive light reflected off the surface.
A method for generating one or more speckle patterns having substantially uniform intensities and sizes, comprising:
- transmitting light from a coherent source towards a surface;
- and
- before the light strikes the surface, dispersing the light in an illumination area on the surface such that the one or more speckle patterns having substantially uniform intensities and sizes are created.
Dependencies are inferred from the claim text.