Methods and apparatus for remotely sensing the orientation of an object
First Claim
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1. A method for remotely sensing the orientation of an object, the method comprising:
- (a) receiving a first speckle pattern produced by radiation of a first frequency reflected from the object;
(b) receiving a second speckle pattern produced by radiation of a second frequency reflected from the object; and
(c) determining the differences between the second speckle pattern and the first speckle pattern.
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Abstract
A method and apparatus for remotely sensing the orientation of an object takes advantage of the fact that, for flat surfaces, a change in radiation frequency illuminating the object produces a global translation at the detector plane of the speckle pattern reflected from the object. An object is illuminated with radiation of two different frequencies and the corresponding speckle patterns are compared to determine the magnitude and direction of shift from the first speckle pattern to the second. The magnitude and direction of the speckle pattern shift indicates the orientation of the object.
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Citations
19 Claims
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1. A method for remotely sensing the orientation of an object, the method comprising:
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(a) receiving a first speckle pattern produced by radiation of a first frequency reflected from the object; (b) receiving a second speckle pattern produced by radiation of a second frequency reflected from the object; and (c) determining the differences between the second speckle pattern and the first speckle pattern. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for remotely sensing the orientation of an object comprising:
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a speckle pattern receiver which receives a first speckle pattern corresponding to radiation of a first frequency reflected from the object and a second speckle pattern corresponding to radiation of a second frequency reflected from the object; and a processor in electrical communication with said speckle pattern receiver, said processor comparing the second speckle pattern to the first speckle pattern to determine the differences between for the second speckle pattern and the first speckle pattern. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. An apparatus for remotely sensing the orientation of an object, the apparatus comprising:
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a radiation source alternately illuminating the object with radiation at a first frequency and a second frequency; a speckle pattern receiver which receives a first speckle pattern corresponding to radiation of said first frequency reflected from the object and a second speckle pattern corresponding to radiation of said second frequency reflected from the object; and a processor in electrical communication with said speckle pattern receiver, said processor comparing the second speckle pattern to the first speckle pattern in order to determine the direction the second speckle pattern has shifted from the first speckle pattern and the magnitude of the shift. - View Dependent Claims (19)
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Specification