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US 8,941,061 B2Granted
Compressive passive millimeter wave imager
AssigneeUchicago Argonne, LLC
InventorsNachappa Gopalsami, Shaolin Liao, Thomas W. Elmer, Eugene R. Koehl, Alexander Heifetz, Apostolos C. Raptis
Life of this patent
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Abstract
A compressive scanning approach for millimeter wave imaging and sensing. A Hadamard mask is positioned to receive millimeter waves from an object to be imaged. A subset of the full set of Hadamard acquisitions is sampled. The subset is used to reconstruct an image representing the object.
Claims20
A method for millimeter-wave imaging comprising:
- positioning a portion of an extended Hadamard mask within an opening of a template with an opening of size p×q, the extended Hadamard mask having a size (2p−1)×(2q−1) wherein p and q are prime numbers, the Hadamard mask receiving millimeter waves from a source;
- transmitting a portion of the millimeter waves through transmit pixels in the Hadamard mask;
- reflecting a portion of the millimeter waves by reflect pixels in the Hadamard mask;
- focusing the transmitted portion of the millimeter waves;
- and
- receiving the focused millimeter waves at a detector.
3 more elements
A system for passive millimeter wave imaging a source comprising:
- an extended Hadamard mask comprising a plurality of pixels, the pixels including transmitting pixels and non-transmitting pixels, the transmitting pixels allowing millimeter waves to pass through;
- a template with an opening smaller than the extended Hadamard mask, the template positioned between the source and the extended Hadamard mask
- a focusing lens positioned behind the extended Hadamard mask relative to the source and positioned to receive millimeter waves from the extended Hadamard mask;
- a receiving antenna associated with the focusing lens to receive millimeter waves;
- and
- a radiometer in communication with the receiving antenna.
3 more elements
A computer-implemented machine for imaging an object, comprising:
- a processor;
- and
- a tangible computer-readable medium operatively connected to the processor and including computer code configured to control:
- imaging an object via an imaging lens at an image plane;
- positioning a Hadamard mask at the image plane;
- interacting millimeter waves from the object with the Hadamark mask;
- transmitting a portion of the millimeter waves through transmit pixels in the Hadamark mask;
- focusing the transmitted portion of the millimeter waves;
- and
- receiving the focused millimeter waves.
7 more elements
Dependencies are inferred from the claim text.