US3939342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for measuring an angular deviation by heterodyne detection
Assignee: Societe Anonyme de Telecommunications SAT
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Filing: 1974-03-28
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Granted: 1976-02-17
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Expires: 1994-03-28
Abstract
Abstract A device for measuring an angular deviation by a space-time modulated heterodyne detection comprising a coherent optical radiation transmitter pointed at a target, a local transmitter of a coherent optical radiation having the same wavelength as the preceding radiation, a photovoltaic detector, means for focussing at a point on said detector the radiation reflected by the target, and means for converting the radiation of the local transmitter into a parallel beam and causing said parallel beam to impinge perpendicularly on the surface of said detector, wherein the means for space-time modulating the heterodyne detection are interposed in the path of the radiation from the local transmitter.
Inventors
- 👤 Jean Pierre Bezerie
- 👤 Michel Benoit Sirieix
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:31
CPC Classifications
G; G01; G01S; G01S17/00; G01S17/02; G01S17/06; G01S7/00; G01S7/48; G01S7/491; G01S7/4912; G01S7/4917
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
110 words
A device for measuring an angular deviation by a space-time modulated heterodyne detection comprising a coherent optical radiation transmitter pointed at a target, a local transmitter of a coherent optical radiation having the same wavelength as the preceding radiation, a photovoltaic detector, means for focussing at a point on said detector the radiation reflected by the target, and means for converting the radiation of the local transmitter into a beam of parallel rays and causing said beam of parallel rays to impinge perpendicularly on the surface of said detector, wherein the means for space-time modulating the heterodyne detection are interposed in the path of the radiation from the local transmitter.
Claim 2
Independent Claim
110 words
A device for measuring an angular deviation by a space-time modulated heterodyne detection comprising a coherent optical radiation transmitter pointed at a target, a local transmitter of a coherent optical radiation having the same wavelength as the preceding radiation, a photovoltaic detector, means for focussing at a point on said detector the radiation reflected by the target, and means for converting the radiation of the local transmitter into a beam of parallel rays and causing said beam of parallel rays to impinge perpendicularly on the surface of said detector, wherein the means for space-time modulating the heterodyne detection are interposed in the path of the radiation from the local transmitter.
Claim 3
Dependent Claim
15 words
A device according to the claim 1, wherein said space-time modulation is a frequency modulation.
Claim 4
Dependent Claim
14 words
A device according to the claim 1, wherein the space-time modulation means are mechanical.
Claim 5
Dependent Claim
23 words
A device according to the claim 1, wherein the space-time modulating means comprise means for modulating the transverse modes of the local transmitter.
Claim 6
Dependent Claim
23 words
A device according to the claim 3, wherein the modulating means comprise alternately transparent and opaque sectors undergoing a circular movement of translation.
Claim 7
Independent Claim
140 words
A device for measuring an angular deviation by a space-time modulated heterodyne detection comprising a coherent optical radiation transmitter pointed at a target, a local transmitter of a coherent optical radiation having the same wavelength as the preceding radiation, a photovoltaic detector, means for focussing at a point on said detector the radiation reflected by the target, and means for converting the radiation of the local transmitter into a beam of parallel rays and causing said parallel beam to impinge perpendicularly on the surface of said detector, wherein the means for space-time modulating the heterodyne detection are interposed in the path of the radiation from the local transmitter, said space-time modulating means comprising mechanical frequency modulation means for modulating the transverse modes of the local transmitter, said modulating means having alternately transparent and opaque sectors undergoing circular movement of translation.
Claim 8
Independent Claim
140 words
A device for measuring an angular deviation by a space-time modulated heterodyne detection comprising a coherent optical radiation transmitter pointed at a target, a local transmitter of a coherent optical radiation having the same wavelength as the preceding radiation, a photovoltaic detector, means for focussing at a point on said detector the radiation reflected by the target, and means for converting the radiation of the local transmitter into a beam of parallel rays and causing said parallel beam to impinge perpendicularly on the surface of said detector, wherein the means for space-time modulating the heterodyne detection are interposed in the path of the radiation from the local transmitter, said space-time modulating means comprising mechanical frequency modulation means for modulating the transverse modes of the local transmitter, said modulating means having alternately transparent and opaque sectors undergoing circular movement of translation.
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) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |