Holographic imaging by simultaneous source and receiver scanning
阅读：577发布：2023-11-04
专利汇可以提供Holographic imaging by simultaneous source and receiver scanning专利检索，专利查询，专利分析的服务。并且Both a radiation source and a radiation receiver are scanned relative to an object scene under investigation for obtaining holographic information as to the scene. By relating the relative movement of the source and receiver in a predetermined manner, various characteristics of the holographically reconstructed image of the object scene may be controlled. In one embodiment, the source and receiver are locked together and scanned relative to an object scene during the construction of a hologram capable of reconstructing an image of the object scene with twice the resolution that is obtained by ordinary holographic techniques. Apparatus for carrying out this improved scanning technique is disclosed in the embodiment of ultrasonic holography wherein a hologram is constructed directly on photographic film or displayed on a cathode ray oscilloscope.，下面是Holographic imaging by simultaneous source and receiver scanning专利的具体信息内容。
1. In a method of producing holographic information of an object which includes the steps of, illuminating the object by a diverging coherent radiation beam from a point source, thereby to produce object modified radiation, scanning a point receiver at a finite velocity over a surface area having a finite extent in two dimensions relative to said object to detect the object modified radiatiOn, and mixing a reference signal with the object modified source radiation striking said receiver, said reference signal being mutually coherent with the object-illuminating radiation beam, thereby producing holographic information of the object; the improvement comprising, simultaneously scanning the source at a finite velocity over a surface area having a finite extent in two dimensions relative to said object.
2. A method according to claim 1 wherein the surface areas scanned are substantially plane areas.
3. A method according to claim 2 wherein the plane surface areas scanned are substantially parallel.
4. A method according to claim 2 wherein the plane surface areas scanned are substantially coincident.
5. A method according to claim 1 wherein the surface areas scanned are parallel plane areas and wherein the source and receiver are scanned over the areas with a ratio of their velocities being substantially a constant throughout the scanning process.
6. A method according to claim 1 wherein velocity components of the scanning source and receiver relative to said object are related by proportionality constants throughout the scanning process.
7. A method according to claim 6 wherein said source and receiver are scanned over substantially plane areas.
8. A method according to claim 5 wherein the constant relating the velocities of the scanning source and receiver is unity.
9. A method according to claim 1 wherein said source and said receiver are mechanically locked together throughout the simultaneous scanning.
10. A method according to claim 9 wherein the locked source and receiver are substantially coincident with each other.
11. A method according to claim 1 wherein the step of illuminating the object by a coherent radiation source includes illuminating the object by a source of electromagnetic energy.
12. A method according to claim 1 wherein the step of illuminating the object by a coherent radiation source includes illuminating the object by a source of compressional wave energy.
13. A method according to claim 1 wherein the step of illuminating the object by a coherent radiation source includes the step of illuminating the object by a source of visible light.
14. A method according to claim 1 wherein the source scanned and receiver scanned areas are nonoverlapping.
15. A method of producing and recording holographic information of an object, comprising the steps of: illuminating the object by scanning a point coherent radiation source at a finite velocity over a surface area of finite extent in two dimensions relative to said object, said point source illuminating substantially the same portions of the object from every point on the scanned surface area, thereby to produce object modified radiation, simultaneously scanning a point receiver at a finite velocity over a surface area having a finite extent in two dimensions relative to said object to detect the object modified radiation, mixing a reference signal with the object modified radiation striking said receiver, said reference signal being mutually coherent with the object illuminating source radiation, thereby producing holographic information of the object, and recording said holographic information on a two-dimensional area detector in a form so that a three-dimensional optical image of said object may be reconstructed therefrom.
16. A method of producing holographic information of an object, comprising the steps of: illuminating the object by scanning a point coherent radiation source in a given pattern across a first surface area of finite extent in two dimensions relative to said object, said point source illuminating substantially the same portions of the object from every point on the scanned first surface area, thereby to produce object modified radiation, simultaneously scanning a point receiver in a pattern that is a substantial replica of said given source scanning pattern over a second surface area of a finite extent in two dimensions relative to said object, thereby detecting the object modified radiation, mixing a reference signal with the object modified radiation striking said receiver, said reference signal being mutually coherent with the object illuminating source radiation, thereby producing holographic information of the object, and exposing to said holographic information a photosensitive surface area of a finite extent in two dimensions point-by-point thereacross in a pattern that is a substantial replica of said given source scanning pattern, whereby the holographic information produced by scanning said object is displayed in a form from which a three-dimensional image of the object may be reconstructed.
17. The method as defined in claim 16 wherein the simultaneously scanned source and receiver have velocity components in at least one direction that are related by a single proportionality constant throughout the scanning of said source and receiver surfaces.
18. The method as defined in claim 17 wherein said first and second surfaces are planes which are parallel to each other.
19. A method of producing holographic information of an object, comprising the steps of: illuminating the object with a diverging beam of coherent radiation from a point source, thereby generating an object modified radiation wave front, positioning in the path of the object modified radiation wave front a point radiation receiver which generates a signal proportional to the radiation intensity incident thereon, scanning the source and receiver over respective surface areas of finite extent in two dimensions relative to the object, said source and receiver at every instant traveling with respect to the object with velocities in a common direction and with a ratio of their speeds relative to the object being substantially a constant throughout the scanning of their respective areas, mixing a reference signal with the object modified radiation striking said receiver, said reference signal being mutually coherent with the object illuminating source radiation, thereby to produce a holographic information signal of the object, simultaneously exposing a photosensitive surface area of a finite extent in two dimensions to said holographic information signal, said surface being exposed point-by-point thereacross at a velocity related at all times by a proportionality constant to the receiver velocity, whereby the holographic information signal is displayed in a form from which a three-dimensional image of the object may be reconstructed.
20. The method as defined in claim 19 wherein said source and receiver scanned surface areas are planar surfaces oriented substantially parallel to each other.
21. The method as defined in claim 19 wherein said source and receiver scanned surface areas are nonoverlapping.
22. A method of producing holographic information of an object, comprising the steps of: illuminating the object with coherent radiation from a point source, thereby to produce object modified radiation, detecting the object modified radiation with a point receiver, simultaneously scanning said point source and said point receiver in a locked relationship over surface areas of finite extent in two dimensions relative to said object, mixing a reference signal with the detected object modified radiation striking the receiver, said reference signal being mutually coherent with the object-illuminating source radiation, thereby producing holographic information of the object, and simultaneously exposing to said holographic information a photosensitive surface area of finite extent in two dimensions point-by-point thereacross in a pattern that is the same as or a substantial replica of the scanning pattern of said source and receiver relative to said object, whereby the holographic information is displayed in a form from which a three-dimensional image of the object may be reconstructed.
23. A method of producing a holographic image of an object, comprising the steps of: illuminating the object by scanning a point coherent radiation source in a given pattern across a first surface area of finite extent in two dimensions relative to said object, said point source illuminating substantially the same portions of the object from every point on the scanned surface area, thereby to produce object modified radiation, simultaneously scanning a point receiver in a pattern that is a substantial replica of said given source scanning pattern over a second surface area of a finite extent in two dimensions relative to said object, thereby detecting the object modified radiation, mixing a reference signal with the object modified radiation striking said receiver, said reference signal being mutually coherent with the object-illuminating source radiation, thereby producing holographic information of the object, exposing to said holographic information a photosensitive surface area of finite extent in two dimensions point-by-point thereacross in a pattern that is a substantial replica of said given source scanning pattern, thereby forming a hologram, and illuminating said hologram with light radiation to reconstruct an image of said object.
24. The method as defined in claim 23 wherein the simultaneously scanned source and receiver have velocity components in at least one lateral direction that are related by a proportionality constant C at any instant throughout the scanning of said source and receiver surfaces, wherein the distances to the source and receiver scanning surfaces from the object are equal, and wherein magnifications of the object image in a radial direction (Mr) and in said lateral direction (Mx) are made substantially equal by making Mr Mx in the following expression: where lambda 1 is the wavelength of said coherent object-illuminating radiation and lambda 2 is the wavelength of said hologram-illuminating light radiation.
25. A method of producing holographic information with an object submersed in a liquid medium, comprising the steps of: illuminating the object by scanning in said liquid medium a point source of compressional wave energy in a given pattern across a first surface area of finite extent in two dimensions relative to said object, said point source illuminating substantially the same portions of the object from every point on the scanned first surface area, thereby to produce object modified radiation, simultaneously scanning in said liquid a point receiver of compressional wave energy in a pattern that is a substantial replica of said given source scanning pattern over a second surface area of a finite extent in two dimensions relative to said object, thereby detecting the object modified radiation, mixing a reference signal with the object modified radiation striking said receiver, said reference signal being mutually coherent with the object-illuminating source radiation, thereby producing holographic information of the object, and exposing to said holographic information a photosensitive surface area of a finite extent in two dimensions point-by-point thereacross in a pattern that is a substantial replica of said given source scanning pattern, whereby the holographic information produced by scanning said object is displayed in a form from which a three-dimensional optical image of the object may be reconstructed.
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