US5420681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modular multiple spectral imager and spectral imager
Assignee: BAE Systems Space & Mission Systems Inc
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Filing: 1993-08-03
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Granted: 1995-05-30
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Expires: 2013-08-03
Abstract
Abstract A multiple spectral imager includes three modular imaging spectrometers, each having a respective collimator, dispersing element, and imaging system. Each collimator includes a pair of parabolic reflectors having a common focal point and an elongated slit positioned at the focal point, and each collimator defines a pupil near the respective dispersing element. The dispersing elements disperse light from various positions along the slit of the collimator into the respective imaging system, and each of the imaging systems includes an array detector that intercepts the dispersed light from the respective dispersing element and registers spectral information in a first direction and spatial information in a second direction. The spectrometers are stacked adjacent to one another, and light from a single directing mirror enters the collimators of all three of the spectrometers. The three array detectors are each responsive to a separate respective spectral region.
Inventors
- 👤 Robert A. Woodruff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:26
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/28; G01J3/2823; G01J3/02; G01J3/0205; G01J3/0208; G01J3/0291; G01J3/0294; G01J3/30; G01J3/36; G01J3/12; G01J3/18; G01J2003/1828; G01N; G01N2201/00; G01N2201/02; G01N2201/024
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
161 words
A multiple spectral imager comprising: first and second modular imaging spectrometers, each comprising a respective collimator, a respective dispersing element, and a respective imaging system; each of said collimators comprising a respective pair of parabolic reflectors having a common focal point and a respective elongated slit at the focal point, each of said collimators defining a pupil near the respective dispersing element; each of said dispersing elements dispersing light from various positions along the slit of the respective collimator into the respective imaging system; each of said imaging systems comprising a respective array detector that intercepts the dispersed light from the respective dispersing element and registers spectral information in a first direction and spatial information in a second direction; and a directing mirror; said first and second modular imaging spectrometers stacked adjacent one another such that light from the directing mirror enters the collimators of both of the imaging spectrometers; said array detectors each responsive to a separate respective spectral region.
Claim 2
Dependent Claim
161 words
A multiple spectral imager comprising: first and second modular imaging spectrometers, each comprising a respective collimator, a respective dispersing element, and a respective imaging system; each of said collimators comprising a respective pair of parabolic reflectors having a common focal point and a respective elongated slit at the focal point, each of said collimators defining a pupil near the respective dispersing element; each of said dispersing elements dispersing light from various positions along the slit of the respective collimator into the respective imaging system; each of said imaging systems comprising a respective array detector that intercepts the dispersed light from the respective dispersing element and registers spectral information in a first direction and spatial information in a second direction; and a directing mirror; said first and second modular imaging spectrometers stacked adjacent one another such that light from the directing mirror enters the collimators of both of the imaging spectrometers; said array detectors each responsive to a separate respective spectral region.
Claim 3
Dependent Claim
17 words
The invention of claim 1 wherein at least one of the dispersing elements comprises a respective grating.
Claim 4
Dependent Claim
18 words
The invention of claim 1 wherein the first and second directions of each array detector are substantially orthogonal.
Claim 5
Dependent Claim
16 words
The invention of claim 1 wherein the parabolic reflectors in each pair define equal focal lengths.
Claim 6
Dependent Claim
25 words
The invention of claim 1 wherein each modular imaging spectrometer defines a maximum thickness measured parallel to the respective slit of less than 2 inches.
Claim 7
Dependent Claim
34 words
The invention of claim 1 wherein each of said imaging systems comprises a respective set of imaging lenses positioned and configured to image light from the respective dispersing element onto the respective detector array.
Claim 8
Dependent Claim
26 words
The invention of claim 1 wherein each of the imaging spectrometers further comprises a respective housing that encloses the respective collimator, dispersing element and imaging system.
Claim 9
Dependent Claim
14 words
The invention of claim 1 wherein each of the elongated slits passes transmitted light.
Claim 10
Dependent Claim
23 words
The invention of claim 2 wherein the imaging system comprising the grating comprises an order sorting filter positioned adjacent the respective array detector.
Claim 11
Dependent Claim
22 words
The invention of claim 9 wherein the order sorting filter varies spatially to filter only a portion of the respective array detector.
Claim 12
Dependent Claim
104 words
A spectral imager comprising: a collimator; a dispersing grating; and an imaging system; said collimator defining a pupil at the dispersing grating, and said collimator comprising an elongated slit; said dispersing grating dispersing light from various positions along the slit of the collimator into the imaging system; said imaging system comprising an array detector that intercepts the dispersed light from the dispersing grating and registers spectral information in a first direction and spatial information in a second direction; and an order sorting filter positioned adjacent the array detector, wherein the order sorting filter varies spatially to filter only a portion of the array detector.
Claim 13
Dependent Claim
104 words
A spectral imager comprising: a collimator; a dispersing grating; and an imaging system; said collimator defining a pupil at the dispersing grating, and said collimator comprising an elongated slit; said dispersing grating dispersing light from various positions along the slit of the collimator into the imaging system; said imaging system comprising an array detector that intercepts the dispersed light from the dispersing grating and registers spectral information in a first direction and spatial information in a second direction; and an order sorting filter positioned adjacent the array detector, wherein the order sorting filter varies spatially to filter only a portion of the array detector.
Claim 14
Dependent Claim
13 words
The invention of claim 11 wherein the first and second directions are orthogonal.
Claim 15
Dependent Claim
29 words
The invention of claim 11 wherein said imaging system comprises a set of imaging lenses positioned and configured to image light from the dispersing element onto the detector array.
Claim 16
Dependent Claim
29 words
The invention of claim 11 wherein the collimator comprises a pair of parabolic reflectors having a common focal point, wherein the slit is positioned at the common focal point.
Claim 17
Dependent Claim
13 words
The invention of claim 11 wherein the parabolic reflectors define equal focal lengths.
Claim 18
Dependent Claim
12 words
The invention of claim 11 wherein the elongated slit passes transmitted light.
References Cited (Backward Citations)
US3811749A
Cited
US3963328A
Cited
DE2814058A1
Cited
US4289401A
Cited
US4411499A
Cited
US4566792A
Cited
US4576452A
Cited
US4773756A
Cited
US4820048A
Cited
US5088823A
Cited
US5139335A
Cited
US5260767A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-05-29 | 1998-11-28 | 1999-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-05-29 | 2002-11-28 | 2003-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-05-29 | 2006-11-28 | 2007-05-30 | $7700.00 | Window Closed / Lapsed |