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US5606413A
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Real time spectroscopic imaging system and method
Assignee: Northrop Grumman Corp
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Filing: 1995-01-19
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Granted: 1997-02-25
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Expires: 2015-01-19
Abstract
Abstract To dramatically reduce image data processing requirements in spectroscopic imaging systems, an optical filter is alternatingly tuned to a pair of selected passband wavelengths related to an absorption wavelength of a sample under test, such that only light of the two selected wavelengths received from the test sample are recorded as alternating image frames by a CCD optical detector. Successive pairs of consecutive image frames are computer processed, on a corresponding pixel-by-pixel basis, to generate a series of composite image frames that may be displayed in enhanced contrast to permit real time analysis of a sample characteristic of interest.
Inventors
- 👤 Peter A. Bellus
- 👤 Terry L. McKinney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:28
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/12; G01J3/1256; G01J3/28; G01J3/2823
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
187 words
A spectroscopic imaging system for analyzing a test sample, the system comprising, in combination: input optics for receiving and focusing image light from said test sample; an optical filter for receiving and filtering said focused image light to thereby pass a plane image, said optical filter capable of being selectively tuned to either a single passband wavelength or to multiple passband wavelengths simultaneously, where said filter is alternately tuned to alternately pass a plane image comprising at least a single passband wavelength and a plane image comprising multiple passband wavelengths; a planar optical detector array for receiving said plane image; and an image processor connected to the optical detector for receiving first and second image data from said optical detector, said first image data representing said plane image when said optical filter is tuned to said at least a single passband wavelength and said second image data representing said plane image when said optical filter is tuned to said multiple passband wavelengths simultaneously, and for processing said first and second image data to thereby generate a composite plane image permitting real time analysis of the test sample.
Claim 2
Dependent Claim
187 words
A spectroscopic imaging system for analyzing a test sample, the system comprising, in combination: input optics for receiving and focusing image light from said test sample; an optical filter for receiving and filtering said focused image light to thereby pass a plane image, said optical filter capable of being selectively tuned to either a single passband wavelength or to multiple passband wavelengths simultaneously, where said filter is alternately tuned to alternately pass a plane image comprising at least a single passband wavelength and a plane image comprising multiple passband wavelengths; a planar optical detector array for receiving said plane image; and an image processor connected to the optical detector for receiving first and second image data from said optical detector, said first image data representing said plane image when said optical filter is tuned to said at least a single passband wavelength and said second image data representing said plane image when said optical filter is tuned to said multiple passband wavelengths simultaneously, and for processing said first and second image data to thereby generate a composite plane image permitting real time analysis of the test sample.
Claim 3
Dependent Claim
38 words
The spectroscopic imaging system defined in claim 1, wherein the optical filter is an acousto-optic tunable filter, the system further including an RF generator connected to tune the acousto-optic tunable filter to the first and second passband wavelengths.
Claim 4
Dependent Claim
38 words
The spectroscopic imaging system defined in claim 1, wherein the optical filter is an acousto-optic tunable filter, the system further including an RF generator connected to tune the acousto-optic tunable filter to the first and second passband wavelengths.
Claim 5
Dependent Claim
30 words
The spectroscopic imaging system defined in claim 1, further including output optics positioned between the optical filter and the optical detector to focus the plane image on the optical detector.
Claim 6
Dependent Claim
21 words
The spectroscopic imaging system defined in claim 1, further including a display for displaying the composite plane image in real time.
Claim 7
Dependent Claim
85 words
The spectroscopic imaging system defined in claim 1 wherein the optical detector includes a planar array of pixels for producing first pixel data in response to said first image data and second pixel data in response to said second image data, and the image processor including means for combining, on a corresponding pixel-by-pixel bases, the first and second pixel data to produce composite pixel data, the system further including a display for displaying the composite pixel data as the composite plane image in enhanced contrast.
Claim 8
Dependent Claim
17 words
The spectroscopic imaging system defined in claim 6, wherein the combining means performs a mathematical subtraction operation.
Claim 9
Dependent Claim
17 words
The spectroscopic imaging system defined in claim 6, wherein the combining means performs a mathematical ratioing operation.
Claim 10
Independent Claim
125 words
A method for performing spectroscopic analysis of a test sample comprising the steps of: focusing image light from a test sample on an optical filter; successively tuning said optical filter to at least a single passband wavelength and to multiple passband wavelengths simultaneously; optically detecting and storing the plane image; and receiving first and second image data of the plane image, said first image data representing said plane image when said optical filter is tuned to said at least a single passband wavelength and said second image data representing said plane image when said optical filter is tuned to said multiple passband wavelengths simultaneously; processing the first and second image data to construct a composite plane image permitting real time analysis of the test sample.
Claim 11
Independent Claim
125 words
A method for performing spectroscopic analysis of a test sample comprising the steps of: focusing image light from a test sample on an optical filter; successively tuning said optical filter to at least a single passband wavelength and to multiple passband wavelengths simultaneously; optically detecting and storing the plane image; and receiving first and second image data of the plane image, said first image data representing said plane image when said optical filter is tuned to said at least a single passband wavelength and said second image data representing said plane image when said optical filter is tuned to said multiple passband wavelengths simultaneously; processing the first and second image data to construct a composite plane image permitting real time analysis of the test sample.
Claim 12
Dependent Claim
19 words
The method defined in claim 9 further including the step of displaying the composite plane image in real time.
Claim 13
Dependent Claim
53 words
The method defined in claim 9, wherein the processing step includes the step of generating composite image data by combining said first image data with said second image data, the method further including the step of displaying the composite image data as a composite plane image of the test sample in enhanced contrast.
Claim 14
Dependent Claim
28 words
The method defined in claim 11, wherein the generating step generates the composite image data by combining the first and second image data in a mathematical subtraction operation.
Claim 15
Dependent Claim
25 words
The method defined in claim 12, wherein the generating step generates the composite image data from absolute values of results of the mathematical subtraction operation.
Claim 16
Dependent Claim
41 words
The method defined in claim 11, wherein the generating step combines the first and second image data in a mathematical subtraction operation to obtain subtraction data and applies a thresholding function to the subtraction data to obtain the composite image data.
Claim 17
Dependent Claim
28 words
The method defined in claim 11, wherein the generating step combines the first and second image data in a mathematical ratio operation to obtain the composite image data.
Claim 18
Dependent Claim
41 words
The method defined in claim 11, wherein the generating step combines the first and second image data in a mathematical ratio operation to obtain ratio data and applies a thresholding function to the ratio data to obtain the composite image data.
Claim 19
Dependent Claim
50 words
The method defined in claim 9, wherein the processing step includes the step of generating composite image data by combining said first image data and said second image data, the method further including the step of comparing the composite image data to standard image data to identify any discrepancies therebetween.
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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) | 2000-02-25 | 2000-08-26 | 2001-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-02-25 | 2004-08-26 | 2005-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-02-25 | 2008-08-26 | 2009-02-25 | $7700.00 | Window Closed / Lapsed |