Optical correlator
AssigneeErnst Leitz Wetzlar GmbH
InventorsEckart Schneider, Eckart Delingat
Life of this patent
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Abstract
An optical correlator having an imaging system for the non-contact measuring of the velocity and/or direction of motion and/or the distance of an object, and comprising at least one grating structure having lines thereon mounted at least in the vicinity of the image plane of the imaging system and at least one photoelectric receiver arranged after the grating structure in the direction of the light, the receiver converting the modulated light fluxes resulting from the grating structure into electrical signals, the improvement comprising a supplemental structural device inserted between the imaging system and the grating structure of the correlator for transforming spatial frequencies contained in the image of an object.
Claims5
An optical correlator having an imagining system for the non-contact measuring of the velocity and/or direction of motion and/or the distance of an object, and comprising at least one grating structure having lines thereon mounted at least in the vicinity of the image plane of said imaging system and at least one photoelectric receiver arranged after the grating structure in the direction of the light, said receiver converting the modulated light fluxes resulting from the grating structure into electrical signals, the improvement comprising a supplemental structural device inserted between said imaging system and said grating structure of said correlator for matching the function of the distribution of the structural elements of the image of said object in said image plane with the function of the distribution of said grating structure by transforming spatial frequencies contained in the image of an object transversely to the direction of the lines of said grating structure;
- said matching resulting in improved electrical signals.
Dependencies are inferred from the claim text.