US 7,773,218 B2 Aug. 10, 2010
Inventors: David J. Brady, Durham, NC (US);
Michael E. Gehm, Tucson, AZ (US)
Assignee: Duke University, Durham, NC (US)
Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 236 days.
Filed: Apr. 16, 2007
Prior Publication Data
US 2007/0296965 Al Dec. 27, 2007
Related U.S. Application Data
Provisional application No. 60/792,335, filed on Apr. 17, 2006.
GO 1J 3/04 (2006.01)
U.S. CI 356/310; 250/281; 250/300;
Field of Classification Search 356/310,
356/326-330; 250/281-300 See application file for complete search history.
U.S. PATENT DOCUMENTS 3,888,362 A * 6/1975 Fletcher et al 414/626
Embodiments of the present invention relate to systems and methods for spectral imaging. Electromagnetic energy emanating from an object is passed through a first dispersive element, a coded aperture, and a second dispersive element to a detector plane. A wavelength-dependent shift is created by the first dispersive element. The coded aperture modulates the image emanating from the first dispersive element. The wavelength-dependent shift is removed from the modulated image by the second dispersive element producing a wavelengthindependent image measured by the detector. A spectral image of the object is calculated from the measured image, a wavelength-dependent shift of the first dispersive element, the code of the coded aperture, and a wavelength dependent shift of the second dispersive element. A spectral image can be calculated from measurements obtained in a single time step and from a number of measurements that is less than the number of elements in the spectral image.
19 Claims, 19 Drawing Sheets