US5539518A
Expired / Lapsed
US
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Method for determining and displaying the spacial distribution of a spectral pattern of received light
Assignee: United States Department of Energy
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Filing: 1995-06-06
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Granted: 1996-07-23
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Expires: 2015-06-06
Abstract
Abstract An imaging Fourier transform spectrometer (10, 210) having a Fourier transform infrared spectrometer (12) providing a series of images (40) to a focal plane array camera (38). The focal plane array camera (38) is clocked to a multiple of zero crossing occurrences as caused by a moving mirror (18) of the Fourier transform infrared spectrometer (12) and as detected by a laser detector (50) such that the frame capture rate of the focal plane array camera (38) corresponds to a multiple of the zero crossing rate of the Fourier transform infrared spectrometer (12). The images (40) are transmitted to a computer (45) for processing such that representations of the images (40) as viewed in the light of an arbitrary spectral "fingerprint" pattern can be displayed on a monitor (60) or otherwise stored and manipulated by the computer (45).
Inventors
- 👤 Charles L. Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:24
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/28; G01J3/2823; G01J3/45; G01J3/453
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
196 words
A method for determining and displaying the spacial distribution of a selected spectral pattern received light comprising the steps of: collimating said received light; passing said collimated light through an interferometer having a moving mirror; focusing the light that has passed through said interferometer as an image onto a focal plane array of pixels of a digital framing camera; repetitively sampling an intensity of said image in said digital framing camera to provide digital frames of the intensity of said image as a function of the position of the moving mirror; storing said digital frames of the intensity of said image in a memory; coupling the stored digital frames of the intensity of said image to a computer; calculating in said computer a Fourier transform of each of said stored digital frames of the intensity of said image to provide spectra for every pixel in said array; filtering said spectra for the selected spectral pattern in said spectra for every pixel in said array to provide an image of said spectral pattern across said array; and displaying said image of said spectral pattern on a video monitor to provide the spacial distribution of said spectral pattern.
Claim 2
Independent Claim
196 words
A method for determining and displaying the spacial distribution of a selected spectral pattern received light comprising the steps of: collimating said received light; passing said collimated light through an interferometer having a moving mirror; focusing the light that has passed through said interferometer as an image onto a focal plane array of pixels of a digital framing camera; repetitively sampling an intensity of said image in said digital framing camera to provide digital frames of the intensity of said image as a function of the position of the moving mirror; storing said digital frames of the intensity of said image in a memory; coupling the stored digital frames of the intensity of said image to a computer; calculating in said computer a Fourier transform of each of said stored digital frames of the intensity of said image to provide spectra for every pixel in said array; filtering said spectra for the selected spectral pattern in said spectra for every pixel in said array to provide an image of said spectral pattern across said array; and displaying said image of said spectral pattern on a video monitor to provide the spacial distribution of said spectral pattern.
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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) | 1999-07-23 | 2000-01-22 | 2000-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-23 | 2004-01-22 | 2004-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-23 | 2008-01-22 | 2008-07-23 | $7700.00 | Window Closed / Lapsed |