Method and apparatus for remote sensing of objects utilizing radiation speckle and projected reference
First Claim
1. An imaging apparatus, said imaging apparatus comprising:
- at least one source of coherent radiation outputting a plurality of wavelengths illuminating an object creating a plurality of speckle patterns each corresponding to the plurality of wavelengths;
at least one sensor at a location relative to said object to determine at least one intensity of a speckle pattern for at least one of the plurality of wavelengths;
a processor receiving information from said at least one sensor, said processor having means for constructing at least one autocorrelation of said object from said at least one intensity of said speckle pattern;
a controller for controlling the at least one source of coherent radiation creating a projected reference point;
the controller further comprises means for optically splitting said plurality of wavelengths into a first set of said plurality of wavelengths and a second set of said plurality of wavelengths whereby at least one member of said first set of said plurality of wavelengths interferes with at least one member of said second set of said plurality of wavelengths to create a copy of said object in said at least one autocorrelation; and
said processor further comprising means for executing a regional image selection technique to construct a representation of said object utilizing said projected reference point and said autocorrelation.
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Abstract
Disclosed are systems and methods to extract information about the size and shape of an object by observing variations of the radiation pattern caused by illuminating the object with coherent radiation sources and changing the wavelengths of the source. Sensing and image-reconstruction systems and methods are described for recovering the image of an object utilizing projected and transparent reference points and radiation sources. Sensing and image-reconstruction systems and methods are also described for rapid sensing of such radiation patterns. A computational system and method is also described for sensing and reconstructing the image from its autocorrelation. This computational approach uses the fact that the autocorrelation is the weighted sum of shifted copies of an image, where the shifts are obtained by sequentially placing each individual scattering cell of the object at the origin of the autocorrelation space.
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Citations
22 Claims
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1. An imaging apparatus, said imaging apparatus comprising:
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at least one source of coherent radiation outputting a plurality of wavelengths illuminating an object creating a plurality of speckle patterns each corresponding to the plurality of wavelengths; at least one sensor at a location relative to said object to determine at least one intensity of a speckle pattern for at least one of the plurality of wavelengths; a processor receiving information from said at least one sensor, said processor having means for constructing at least one autocorrelation of said object from said at least one intensity of said speckle pattern; a controller for controlling the at least one source of coherent radiation creating a projected reference point; the controller further comprises means for optically splitting said plurality of wavelengths into a first set of said plurality of wavelengths and a second set of said plurality of wavelengths whereby at least one member of said first set of said plurality of wavelengths interferes with at least one member of said second set of said plurality of wavelengths to create a copy of said object in said at least one autocorrelation; and said processor further comprising means for executing a regional image selection technique to construct a representation of said object utilizing said projected reference point and said autocorrelation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of constructing a representation of an object, said method comprising the steps of:
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outputting a plurality of wavelengths with at least one source of coherent radiation to illuminate an object and create a plurality of speckle patterns each corresponding to the plurality of wavelengths; determining at least one intensity of a speckle pattern for at least one of the plurality of wavelengths with at least one sensor; receiving information from said at least one sensor and constructing at least one autocorrelation of said object from said at least one intensity of said speckle pattern; controlling said at least one source of coherent radiation and creating an illumination spot for use as a projected reference point; optically splitting said plurality of wavelengths into a first set of said plurality of wavelengths and a second set of said plurality of wavelengths whereby at least one member of said first set of said plurality of wavelengths interferes with at least one member of said second set of said plurality of wavelengths to create a copy of said object in said at least one autocorrelation; and executing a regional image selection technique to construct a representation of said object utilizing said projected reference point and said autocorrelation. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An imaging apparatus, said imaging apparatus comprising:
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at least one source of coherent radiation outputting a plurality of wavelengths illuminating an object creating a plurality of speckle patterns each corresponding to the plurality of wavelengths; at least one sensor at a location relative to said object to determine at least one intensity of a speckle pattern for at least one of the plurality of wavelengths; a processor receiving information from said at least one sensor, said processor having means for constructing at least one autocorrelation of said object from said at least one intensity of said speckle pattern; a controller for controlling the at least one source of coherent radiation creating a projected reference point; said projected reference point comprises a spot of coherent radiation that is projected onto a surface of said object; said projected reference point produces a copy of said object in said at least one autocorrelation; said copy of said object is separated from a central region of said at least one autocorrelation; and said processor further comprising means for executing a regional image selection technique to construct a representation of said object utilizing said projected reference point and said autocorrelation.
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22. A method of constructing a representation of an object, said method comprising the steps of:
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outputting a plurality of wavelengths with at least one source of coherent radiation to illuminate an object and create a plurality of speckle patterns each corresponding to the plurality of wavelengths; determining at least one intensity of a speckle pattern for at least one of the plurality of wavelengths with at least one sensor; receiving information from said at least one sensor and constructing at least one autocorrelation of said object from said at least one intensity of said speckle pattern; controlling said at least one source of coherent radiation and creating an illumination spot for use as a projected reference point; executing a regional image selection technique to construct a representation of said object utilizing said projected reference point and said autocorrelation; said projected reference point comprises a spot of coherent radiation that is projected onto a surface of said object; said projected reference point produces a copy of said object in said at least one autocorrelation; and said copy of said object is separated from a central region of said at least one autocorrelation.
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Specification