Device for measuring an angular deviation by heterodyne detection
AssigneeSociete Anonyme de Telecommunications
InventorsJean Pierre Bezerie, Michel Benoit Sirieix
Life of this patent
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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.
Claims6
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.
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.
Dependencies are inferred from the claim text.