US4128337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for interferometric background suppression
Assignee: Visidyne Inc
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Filing: 1977-06-13
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Granted: 1978-12-05
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Expires: 1997-06-13
Abstract
Abstract A method of detecting a small elemental spectral source in a larger, spectral background, including producing a first interferogram of each element of an object area including the source and background; producing a second complementary interferogram of each element of that object area; projecting onto a detector images of the first and second interferograms and defocussing one of the first and second interferograms for providing a fluctuating elemental interferogram output from each element of the detector which receives an interferogram derived from the element of the object area that contains a source which spectrally distinguishes from the background, while reducing the output corresponding to each element containing no source to a constant and non-fluctuating level.
Inventors
- 👤 Theodore F. Zehnpfennig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:13
CPC Classifications
G; G01; G01J; G01J9/00; G01J9/02; G01S; G01S3/00; G01S3/78; G01S3/781
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
106 words
A method of detecting a small elemental spectral source in a larger spectral background by interferometric suppression of the background comprising: producing first and second complementary interferograms of each element of that object area; projecting onto a detector images of said first and second interferograms; and, defocussing one of said first and second interferograms for providing a fluctuating elemental interferogram output from each element of said detector which receives an interferogram derived from an element of said object area that contains a source which spectrally distinguishes from the background, while reducing the output corresponding to each element containing no source to a constant and non-fluctuating level.
Claim 2
Independent Claim
106 words
A method of detecting a small elemental spectral source in a larger spectral background by interferometric suppression of the background comprising: producing first and second complementary interferograms of each element of that object area; projecting onto a detector images of said first and second interferograms; and, defocussing one of said first and second interferograms for providing a fluctuating elemental interferogram output from each element of said detector which receives an interferogram derived from an element of said object area that contains a source which spectrally distinguishes from the background, while reducing the output corresponding to each element containing no source to a constant and non-fluctuating level.
Claim 3
Dependent Claim
118 words
Apparatus for detecting a small, elemental spectral source in a larger spectral background by interferometric suppression of the background comprising: a dual-beam interferometer for producing first and second complementary interferograms of each element of an object area including the source and background; means for projecting onto a detector images of said first and second interferograms; and means for defocussing one of said first and second interferograms for providing a fluctuating elemental interferogram output from each element of said detector which receives an interferogram derived from an element of said object area that contains a source which spectrally distinguishes from the background, while reducing the output corresponding to each element containing no source to a constant and non-fluctuating level.
Claim 4
Dependent Claim
118 words
Apparatus for detecting a small, elemental spectral source in a larger spectral background by interferometric suppression of the background comprising: a dual-beam interferometer for producing first and second complementary interferograms of each element of an object area including the source and background; means for projecting onto a detector images of said first and second interferograms; and means for defocussing one of said first and second interferograms for providing a fluctuating elemental interferogram output from each element of said detector which receives an interferogram derived from an element of said object area that contains a source which spectrally distinguishes from the background, while reducing the output corresponding to each element containing no source to a constant and non-fluctuating level.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-04 | 1982-06-05 | 1982-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-04 | 1986-06-05 | 1986-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-04 | 1990-06-05 | 1990-12-05 | $7700.00 | Window Closed / Lapsed |