Optical device that measures distance between the device and a surface
First Claim
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1. An optical device comprising:
- a first light source that emits first light onto a surface; and
a first detector that receives light reflected from said surface, wherein reflected light produces a first speckle pattern at said first detector with said optical device and said surface separated by a first distance, wherein a quantifiable attribute associated with said first speckle pattern is used to measure distance between said optical device and said surface.
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Abstract
An optical device and methods thereof are described. The device includes a first light source adapted to emit light onto a surface, and a detector adapted to receive light reflected from the surface. The reflected light produces a speckle pattern. The distance between the optical device and the surface can be measured using a quantifiable attribute associated with the speckle pattern.
73 Citations
27 Claims
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1. An optical device comprising:
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a first light source that emits first light onto a surface; and
a first detector that receives light reflected from said surface, wherein reflected light produces a first speckle pattern at said first detector with said optical device and said surface separated by a first distance, wherein a quantifiable attribute associated with said first speckle pattern is used to measure distance between said optical device and said surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of optical navigation using an optical device, said method comprising:
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detecting at said optical device a first speckle pattern produced by light comprising light at a first wavelength reflecting from a surface with said optical device at a first distance from said surface;
detecting at said optical device a second speckle pattern produced by light comprising light at a second wavelength reflecting from said surface with said optical device at a second distance from said surface, wherein said first and second wavelengths are selected so that a first quantifiable value associated with said first speckle pattern and a second quantifiable value associated with said second speckle pattern are approximately equal; and
measuring distance between said optical device and said surface using the ratio of said first and second wavelengths. - View Dependent Claims (13, 14, 15, 16, 17)
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18. In an optical device, a method of optical navigation, said method comprising:
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detecting at said optical device a first speckle pattern produced by light comprising light at a first wavelength reflecting from a surface;
detecting at said optical device a second speckle pattern produced by light comprising light at a second wavelength reflecting from said surface; and
measuring distance between said optical device and said surface using a first quantifiable value associated with said first speckle pattern and a second quantifiable value associated with said second speckle pattern. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification