US5629802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spatially multiplexed optical signal processor
Assignee: United States Department of the Air Force
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Filing: 1995-01-05
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Granted: 1997-05-13
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Expires: 2015-01-05
Abstract
Abstract A spatial light modulator has a plurality of pairs of input and reference images recorded upon a plurality of sub-areas thereof. Each sub-area is illuminated with an associated point source of light which is produced by illuminating a diffraction grating with coherent light. A Fourier transform lens produces a joint transform of each pair of input and reference images which can be detected by a CCD camera.
Inventors
- 👤 Natalie Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:17
CPC Classifications
G; G06; G06E; G06E3/00; G06E3/001; G06E3/005; G02; G02B; G02B27/00; G02B27/0087; G02B27/42; G02B27/46
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
160 words
An optical image processor comprising: (a) a spatial light modulator; (b) image display means having signals therein within a plurality of subareas thereof; (c) a variable programmable diffraction grating within said spatial light modulator, said variable programmable diffraction grating having apertures that can be varied, and having parallel, equidistant slits of the same width; (d) means for illuminating said variable programmable diffraction grating to produce diffracted light; (e) focusing lens means, positioned between said variable programmable diffraction grating and said spatial light modulator, for producing a phased array of point sources of light from the diffracted light produced by said variable programmable diffraction grating, each point source of light being positioned adjacent an associated subarea of said image display means; (f) an image recording device; and (g) a Fourier transform lens coupled between said image display means and said image recording device for directing Fourier transforms of images within each subarea of said image display means upon said recording device.
Claim 2
Dependent Claim
160 words
An optical image processor comprising: (a) a spatial light modulator; (b) image display means having signals therein within a plurality of subareas thereof; (c) a variable programmable diffraction grating within said spatial light modulator, said variable programmable diffraction grating having apertures that can be varied, and having parallel, equidistant slits of the same width; (d) means for illuminating said variable programmable diffraction grating to produce diffracted light; (e) focusing lens means, positioned between said variable programmable diffraction grating and said spatial light modulator, for producing a phased array of point sources of light from the diffracted light produced by said variable programmable diffraction grating, each point source of light being positioned adjacent an associated subarea of said image display means; (f) an image recording device; and (g) a Fourier transform lens coupled between said image display means and said image recording device for directing Fourier transforms of images within each subarea of said image display means upon said recording device.
Claim 3
Dependent Claim
17 words
The combination as set forth in claim 1 wherein said diffraction grating is a two-dimensional cross grating.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-05-12 | 2000-11-11 | 2001-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-05-12 | 2004-11-11 | 2005-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-05-12 | 2008-11-11 | 2009-05-13 | $7700.00 | Window Closed / Lapsed |