Techniques for hologram data reduction
阅读：410发布：2023-11-02
专利汇可以提供Techniques for hologram data reduction专利检索，专利查询，专利分析的服务。并且A technique for reducing the space-bandwidth product, recorded at the hologram plane in the method of holography in which the object wave front is dispersed before reaching the hologram plane such that the space-spatial frequency product of interference fringes recorded at the hologram plane is reduced without reducing the angle of viewing the image upon reconstruction.，下面是Techniques for hologram data reduction专利的具体信息内容。
1. A method of holographically recording a coherent radiation wave front emanating from an object field, comprising the steps of: dispersing said radiation wave front across a surface area of finite dimensions that is located a first distance from said object field in the path of said wave front, whereby said surface area dimensions and said first distance determine a field of view of said object field through said surface area, positioning a hologram detector in the path of the dispersed radiation wave front at a surface located a second distance from said dispersing surface, said first distance multiplied by a dimension across said detecting surface in at least one direction being maintained less than said second distance multiplied by a dimension across said object field in said at least one direction, and directing onto said hologram detector to interfere with the dispersed radiation wave front a reference radiation wave front mutually coherent with the radiation wave front emanating from the object field, said reference radiation wave front striking the hologram detector at a finite angle with the dispersed radiation wave front, whereby an off-axis hologram is formed on the hologram detector with a lower space-spatial frequency product than would result if a hologram detector were positioned coincident with said dispersing surface, said hologram additionally being capable of reconstructing an image of said object field with said field of view as determined by the dispersing surface area dimensions and the first distance.
2. A method of holographically recording a coherent object modified radiation beam from an object field, comprising the steps of: dispersing the object modified radiation beam across a surface area of fixed finite dimensions located a distance from the object field in the path of said object modified radiation beam, whereby the fixed dimensions of said surface area and said distance determine a field of view of said object field through said surface area, locating a hologram detector of fixed dimensions in the path of said dispersed object modified beam a distance from said dispersing surface, and directing a reference beam mutually coherent with said object modified beam against the hologram detector at a finite angle with said dispersed object modified beam, thereby to produce an interference pattern that is recorded as an off-axis hologram on said detector, said distance between the object field and said dispersing surface, said distance between the dispersing surface and the hologram detector, said fixed dimensions of the dispersing surface, said fixed dimensions of the hologram detector and dimensions of the object field all having relative values so that the maximum angle between any dispersed rays striking some point of the detector when multiplied by a distance across said detector in at least one direction is less than a maximum angle between any of the object modified beam rays striking some point of the dispersing surface when multiplied by a distance across said dispersive surface in said at least one direction, whereby the off-axis hologram is capable of reconstructing an image of the object field with said field of view, said off-axis hologram also having reduced data content in comparison with a hologram constructed by positioning a hologram detector coincident with said dispersing surface area.
3. The method as defined in claim 2 wherein the step of dispersing the object modified radiation beam emanating from an object field across a surface thereof consists of retarding the relative phase of the wave front of said object modified radiation beam according to a given relative phase function across said beam.
4. The method as defined in claim 3 wherein said given relative phase function is a random one.
5. The method as defined in claim 3 wherein said given relative phase function is a periodically recurring one.
6. The method as defined in claim 2 wherein the step of dispersing the object modified radiation beam includes altering the relative phase of the wave front of said object modified radiation beam according to periodically recurring relative phase function across said dispersing surface area.
7. The method as defined in claim 2 wherein said object field includes another hologram, said coherent object modified radiation beam being reconstructed from said another hologram.
8. The method as defined in claim 2 wherein said coherent object modified beam rays are dispersed by positioning a transmissive dispersion medium at said dispersing surface.
9. The method as defined in claim 2 wherein said coherent object modified beam rays are dispersed by positioning a reflective dispersion medium at said dispersing surface.
10. The method as defined in claim 2 wherein a dispersion medium of radiation refracting material is positioned coincident with said dispersing surface, said dispersion medium characterized by having surface undulations for imparting a relative phase change across said coherent object modified radiation beam, substantially all of said undulations having slopes that are approximately constant over a distance substantially equal to a product of the wavelength of the coherent radiation and a distance between said dispersive surface and said detector when this product is divided by the refractive index of said dispersive medium, whereby a reduction of hologram data content is accomplished by reducing resolution of a reconstructed image rather than increasing the background noise of a reconstructed image.
11. The method as defined in claim 2 wherein the step of dispersing said coherent radiation wave front across a surface thereof includes positioning coincident with said surface area a dispersion medium having a roughened surface, thereby imparting a relative phase variation across said wave front.
12. A system for holographically recording a coherent object modified radiation beam from an object field, comprising, a dispersive medium of fixed dimensions positioned in the path of saId object modified beam a distance from said object field, whereby to form a dispersed object modified beam, whereby a surface area of said dispersive medium and said distance from the object field determine a field of view of said object field through said surface area, a hologram detector of fixed dimensions positioned in the path of said dispersed object modified beam a distance from said dispersive medium, and means for directing a reference beam mutually coherent with said object modified beam against the hologram detector at a finite angle with said dispersed object modified beam, thereby to produce an interference pattern that is recorded as an off-axis hologram on said detector, said distance between the object field and said dispersive medium, said distance between the dispersive medium and the hologram detector, said fixed dimensions of the dispersive medium, said fixed dimensions of the hologram detector and dimensions of the object field all having relative values so that the maximum angle between any dispersed rays striking some point of the hologram detector when multiplied by a distance across said detector in at least one direction is less than a maximum angle between any of the object modified beam rays striking some point of the dispersive medium when multiplied by a distance across said dispersive medium in said at least one direction, whereby said system constructs an off-axis hologram with reduced data content and a capability of reconstructing an image of the object field with said field of view.
13. A system according to claim 12 wherein said dispersive medium is a diffusion screen having a randomly roughened surface.
14. A system according to claim 12 wherein said dispersive medium includes a substantially transparent refractive sheet material with periodically varying surface undulations on one side thereof.
15. A system according to claim 14 wherein said periodically varying surface undulations have a sinusoidal shape.
16. A system according to claim 14 wherein said periodically varying surface undulations have a parabolic shape.
17. A system according to claim 12 wherein said dispersive medium includes a substantially transparent refractive sheet material with surface undulations on one side thereof for imparting a relative phase change across said object modified radiation beam, substantially all of said undulations having slopes that are approximately constant over a distance substantially equal to a product of the wavelength of the coherent radiation and a distance between the dispersive medium and said detector when this product is divided by the refractive index of said dispersive medium, whereby a reduction of hologram data content is accomplished by reducing resolution of a reconstructed image rather than increasing the background noise of a reconstructed image.
18. A method of holographically recording and reconstructing a coherent information carrying radiation beam originating from an object field, comprising the steps of: positioning a first dispersive medium of fixed surface area dimensions a distance from the object field in the path of the information carrying radiation beam, whereby said dimensions and said distance determine a field of view of said object field through said surface area, thereby dispersing information carrying radiation beam rays into scattered rays of a dispersed information carrying beam, locating a hologram detector of fixed dimensions in the path of said dispersed information carrying beam a distance from said dispersive medium, directing a reference beam having a certain wave front curvature and mutually coherent with said information carrying beam against the hologram detector at a finite angle with said dispersed information carrying beam, thereby to produce an interference pattern that is recorded as an off-axis hologram on said detector, said distance between the object field and said dispersive medium, said distance between the dispersive medium and the hologram detector, said fixed dimensions of the dispersive medium, said fixed dimensions of the hologram detector and dimensions of the object field all having relative values so that the maximum angle between any dispersed rays striking some point of the detector when multiplied by a distance across said detector in at least one direction is less than a maximum angle between any of the information carrying beam rays striking some point of the dispersing surface when multiplied by a distance across said dispersive medium in said at least one direction, whereby a hologram is constructed with reduced data content in comparison with a hologram constructed by positioning a hologram detector coincident with said dispersing surface, illuminating said hologram with coherent reconstructing radiation so that a portion thereof is diffracted into at least one first order wave front in which an image of said dispersive medium is formed in real space, and positioning a second dispersive medium in said at least one first order diffracted wave front coincident with an image of said first dispersive medium, said second dispersive medium having characteristics related to those of said first dispersive medium so that a replica of said information carrying radiation beam is produced in which an image of said object field is formed, whereby said object field image is reconstructed from said hologram with said field of view.
19. The method as defined in claim 18 in which said object field is an off-axis hologram of a physical object, said information carrying radiation beam recorded on the data-reduced hologram is a pseudoscopic image carrying first order diffracted wave front of said off-axis hologram, and said second dispersive medium has a relative phase function thereacross that is the same as that of the first dispersive medium.
20. The method as defined in claim 18 wherein the step of illuminating the data-reduced hologram is accomplished so that said at least one first order reconstructed wave front forms an orthoscopic image of the first dispersive medium, and further wherein the first and second dispersive media used to construct the data-reduced hologram and reconstruct an image therefrom are phase conjugates of each other.
21. The method as defined in claim 20 wherein said first and second dispersive mediums are each spherical in surface shape and positioned with their centers of curvature at approximately the center of the hologram.
22. The method as defined in claim 18 wherein the step of illuminating said hologram includes directing said coherent reconstructing radiation against an opposite side of the hologram from a side thereof exposed to the dispersed information carrying and reference radiation wave fronts during construction of the data-reduced hologram, said reconstructing radiation being of substantially the same frequency as said reference radiation and additionally having a wave front of substantially opposite curvature to that of said reference radiation, whereby a pseudoscopic image of the first dispersive medium is formed in real space directly from said hologram, and further wherein the second dispersive medium positioned coincident with said pseudoscopic image of the first dispersive medium has a phase function thereacross that is substantially identical with that of the first dispersive medium.
23. The method as defined in claim 20 wherein the step of illuminating said data-reduced hologram includes directing said coherent reconstructing wave front against the same side of the hologram that was exposed to the dispersed information carrying and reference radiation wave fronts during construction of the hologram, said reconstructing radiation being of substantially the same frequency as said reference radiation and additionally having a wave front of substantially the same curvature as that of said reference radiation, whereby an orthoscopic image of said first dispersive medium is generated in virtual space behind the hologram, and whereIn the step of illuminating said data-reduced hologram further includes transferring said orthoscopic image from virtual into real space by an optical system, whereby the second dispersive medium is positioned coincident with the real space orthoscopic image of the first dispersive medium.
24. The method as defined in claim 21 wherein the step of illuminating said hologram includes directing said coherent reconstructing wave front against the same side of the hologram that was exposed to the dispersed information carrying and reference radiation wave fronts during construction of the hologram, said reconstructing radiation being of substantially the same frequency as said reference radiation and additionally having a wave front of substantially opposite curvature to that of said reference radiation, whereby an orthoscopic image of said first dispersive medium is formed in real space and said second dispersive medium is positioned coincident therewith.
25. For an off-axis hologram that has been constructed according to the steps of dispersing information bearing radiation wave front across a surface thereof according to a given relative phase function, positioning a hologram detector in the path of the dispersed information bearing radiation wave front and directing toward said detector for interference with the dispersed information bearing radiation wave front a reference radiation wave front mutually coherent with said information bearing radiation wave front, a method of reconstructing a replica of the information bearing radiation wave front from said hologram comprising the steps of: reconstructing from said hologram an actual dispersed information bearing radiation wave front as opposed to a conjugate dispersed information bearing wave front, said reconstructed actual dispersed information bearing radiation wave front forming in real space an actual image of said dispersing surface, and dispersing according to a phase conjugate of said given relative phase function the reconstructed actual dispersed information bearing radiation wave front across a surface thereof in which said actual dispersing surface image is formed, thereby forming a replica of the actual information bearing radiation wave front.
26. The method as defined in claim 25 wherein the step of reconstructing from said hologram an actual dispersed information bearing radiation wave front includes imaging with the use of at least one lens a virtual image of said dispersion phase function into real space.
27. The method as defined in claim 26 wherein the step of reconstructing from said hologram an actual dispersed information radiation wave front additionally includes illuminating said hologram with coherent reconstructing radiation having substantially the same frequency, wave front curvature and angle of incidence against the hologram as the reference radiation wave front used in constructing the hologram.
28. The method as defined in claim 27 wherein the step of dispersing an information bearing wave front includes placing in the path of travel of said wave front a dispersion medium having substantially a spherical surface with a center of curvature substantially coincident with a center of said hologram detecting surface.
29. The method as defined in claim 28 wherein the step of reconstructing from said hologram an actual dispersed information bearing radiation wave front includes illuminating said hologram with coherent reconstructing radiation having substantially the same frequency and a wave front curvature that is opposite to that of the reference radiation wave front used in constructing the hologram.
30. The method as defined in claim 25 wherein said given phase function is a periodically recurring function.
| 标题 | 发布/更新时间 | 阅读量 |
|---|---|---|
| 一种跳级式投影广告视窗 | 2020-12-19 | 0 |
| 一种全息投影智能互动装置 | 2020-06-27 | 0 |
| 生成3D图像的方法与设备 | 2021-09-10 | 3 |
| 全息投影无人机 | 2020-05-26 | 2 |
| Hologram recording and reproducing device | 2021-08-04 | 0 |
| Preparation of novel physical transfer elements such as hot stamping foil and methods for using the same in producing chemically resistant bonds | 2022-01-09 | 3 |
| Holographic rangefinder sunglasses | 2022-01-25 | 2 |
| 무안경 3D 영상을 이용한 3D 홀로그램 구현 시스템 | 2020-09-10 | 3 |
| SYSTEME D'ACQUISITION D'IMAGES PAR HOLOGRAPHIE NUMERIQUE HETERODYNE | 2020-10-22 | 0 |
| APPARATUS AND METHOD FOR MANUFACTURING A SECURITY PRODUCT | 2021-08-04 | 1 |
高效检索全球专利专利汇是专利免费检索,专利查询,专利分析-国家发明专利查询检索分析平台，是提供专利分析，专利查询，专利检索等数据服务功能的知识产权数据服务商。
我们的产品包含105个国家的1.26亿组数据，免费查、免费专利分析。
分析报告
专利汇分析报告产品可以对行业情报数据进行梳理分析，涉及维度包括行业专利基本状况分析、地域分析、技术分析、发明人分析、申请人分析、专利权人分析、失效分析、核心专利分析、法律分析、研发重点分析、企业专利处境分析、技术处境分析、专利寿命分析、企业定位分析、引证分析等超过60个分析角度，系统通过AI智能系统对图表进行解读，只需1分钟，一键生成行业专利分析报告。
QQ群二维码
意见反馈
意见反馈