US4040056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for aberration-free optical recording of highly resolved sonar or radar maps
Assignee: Siemens AG
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Filing: 1975-06-03
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Granted: 1977-08-02
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Expires: 1995-06-03
Abstract
Abstract A method for aberration free optical recording of highly resolved sonar or radar maps wherein a series of one-dimensional holograms is recorded as a function of the receiving time with the help of pulsed sonar or radar and is coherently optically reconstructed, and wherein the one-dimensional holograms are reconstructed through the utilization of a cylindrical lens whose axis of rotation forms an angle with the optical axis such that both the image distance and the image enlargement are independent of distance, the angle being equal to the angle formed between the azimuth coordinate and the optical axis.
Inventors
- 👤 Dietlind Pekau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:34
CPC Classifications
G; G03; G03H; G03H3/00; G01; G01S; G01S7/00; G01S7/02; G01S7/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
65 words
A method for coherently optically reconstructing one-dimensional holograms for sonar or radar maps, comprising the steps of illuminating a one-dimensional hologram with a coherent beam to produce holographic transmission along an optical axis, and transposing a reconstruction plane by an angle into the image plane which is perpendicular to the optical axis so that the image distance and the image enlargement are independent of distance.
Claim 2
Independent Claim
65 words
A method for coherently optically reconstructing one-dimensional holograms for sonar or radar maps, comprising the steps of illuminating a one-dimensional hologram with a coherent beam to produce holographic transmission along an optical axis, and transposing a reconstruction plane by an angle into the image plane which is perpendicular to the optical axis so that the image distance and the image enlargement are independent of distance.
Claim 3
Dependent Claim
33 words
A method according to claim 1, wherein said step of transposing is further defined as transforming by an angle which is equal to the angle between the azimuth coordinate and the optical axis.
Claim 4
Dependent Claim
42 words
A method according to claim 1, wherein the step of transposing is further defined by the step of optically rotating the reconstruction plane with a cylindrical lens having an axis of rotation disposed at an angle with respect to the optical axis.
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) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |