Direct electronic fourier transforms of optical images
First Claim
Patent Images
1. A device for generating an electrical signal representation of an optical image comprising:
- a medium having an electrical property which varies as a function of an optical image formed on the medium and as a function of time and space varying strain disturbances in the medium, said medium being made of a material selected from the group consisting of degenerate semiconductors and metals;
means for forming an optical image on the medium;
means for causing a plurality of different time and space varying strain disturbances in the medium; and
means for measuring said electrical property of the medium at a plurality of said different strain disturbances in the medium while the image is formed on the medium to derive a plurality of electrical signals, each signal representing an aspect of the entire image rather than of a point or an elemental area of the image, said measuring means including means for establishing a constant current across a portion of the medium and means for detecting the potential difference across at least a part of said portion of the medium at a plurality of said different strain disturbances in the medium while the image is formed on the medium.
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Abstract
Method and apparatus for directly converting between optical images and the spatial Fourier transforms of optical images by interacting sound waves and light. Controlled sound waves couple with optical images, and electrical signals may be derived from this coupling which are functions of the spatial Fourier transforms of the entire optical images. In a reverse process, optical images are obtained directly by coupling controlled sound waves with electrical signals which are a function of the spatial Fourier transforms of the optical images and with light.
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Citations
17 Claims
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1. A device for generating an electrical signal representation of an optical image comprising:
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a medium having an electrical property which varies as a function of an optical image formed on the medium and as a function of time and space varying strain disturbances in the medium, said medium being made of a material selected from the group consisting of degenerate semiconductors and metals; means for forming an optical image on the medium; means for causing a plurality of different time and space varying strain disturbances in the medium; and means for measuring said electrical property of the medium at a plurality of said different strain disturbances in the medium while the image is formed on the medium to derive a plurality of electrical signals, each signal representing an aspect of the entire image rather than of a point or an elemental area of the image, said measuring means including means for establishing a constant current across a portion of the medium and means for detecting the potential difference across at least a part of said portion of the medium at a plurality of said different strain disturbances in the medium while the image is formed on the medium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device for generating an electrical signal representation of an optical image comprising:
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a medium having an electrical property which varies as a function of an optical image formed on the medium and as a function of strain disturbances present in the medium; means for forming an optical image on the medium; means for causing a plurality of strain waves of different spatial wavelengths to be concurrently present in the medium; and means for measuring the electrical property of the medium at each of said plurality of different strain waves to derive a corresponding plurality of electrical signals each of which represents an aspect of the entire optical image rather than of a point or an elemental area of the image. - View Dependent Claims (11, 12, 13)
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14. A method of deriving an electrical signal representation of an optical image comprising the steps of:
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forming an optical image on a medium having an electrical property which varies as a function of the optical image formed on it and as a function of strain disturbances present in it; causing a plurality of different strain disturbances in the medium; and measuring the electrical property of the medium at a plurality of said different strain disturbances in the medium to derive a plurality of electrical signals each corresponding to a different strain disturbance and each representing the entire optical image formed on the medium, said measuring means including means for maintaining a constant current through a selected portion of the medium and for deriving said electrical signals by measuring the potential difference across said selected portion of the medium. - View Dependent Claims (15, 16, 17)
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Specification