US3639033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Holographic data reduction with periodic dispersive mediums and method of orthoscopic image reconstruction
Assignee: Battelle Development Corp
•
Filing: 1969-11-12
•
Granted: 1972-02-01
•
Expires: 1989-11-12
Abstract
Abstract A method of holography in which the object wavefront is dispersed before reaching the hologram detector for recordation thereon and an image-carrying diffracted wavefront reconstructed from the hologram detector is dispersed in a manner related to the dispersion of the object wave front during the hologram''s construction. Several specific techniques are disclosed for reconstructing an orthoscopic (actual) image of the object. A preferred technique for reconstructing an orthoscopic image includes making from such a hologram a second hologram without dispersion of the wave front recorded on the second hologram. Dispersion techniques for reducing the space-spatial frequency product of the information holographically recorded are also disclosed wherein a periodically phase-varying diffusion plate etched on one side thereof is utilized for wave front dispersion.
Inventors
- 👤 Kenneth A Haines
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:20
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/04; G03H1/0402; G03H1/041
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
166 words
A method of holographically reconstructing an orthoscopic image of an object, comprising the steps of: constructing a first hologram by interfering a reference radiation beam and an object-modified radiation beam at a first detector, said object-modified beam being dispersed across a given surface thereof prior to striking said detector, reconstructing from said first hologram a wavefront that is the conjugate of said dispersed object-modified radiation beam in a manner to Reconstruct a pseudoscopic image of said dispersion function in real space, constructing a second hologram of said conjugate dispersed object-modified beam by interfering reference radiation therewith at a second detector positioned therein downstream of said dispersion function image, reconstructing from said second hologram a wavefront that is the conjugate of the wavefront recorded thereon and which forms an actual image of said dispersion function in real space, and dispersing the beam reconstructed from the second hologram at the actual image of said dispersion function by a function that is a phase conjugate of said dispersion function.
Claim 2
Independent Claim
166 words
A method of holographically reconstructing an orthoscopic image of an object, comprising the steps of: constructing a first hologram by interfering a reference radiation beam and an object-modified radiation beam at a first detector, said object-modified beam being dispersed across a given surface thereof prior to striking said detector, reconstructing from said first hologram a wavefront that is the conjugate of said dispersed object-modified radiation beam in a manner to Reconstruct a pseudoscopic image of said dispersion function in real space, constructing a second hologram of said conjugate dispersed object-modified beam by interfering reference radiation therewith at a second detector positioned therein downstream of said dispersion function image, reconstructing from said second hologram a wavefront that is the conjugate of the wavefront recorded thereon and which forms an actual image of said dispersion function in real space, and dispersing the beam reconstructed from the second hologram at the actual image of said dispersion function by a function that is a phase conjugate of said dispersion function.
Claim 3
Dependent Claim
30 words
The method as defined in claim 1 wherein the step of constructing a second hologram is accomplished without dispersing the conjugate of the modified beam reconstructed from the first hologram.
Claim 4
Dependent Claim
59 words
The method as defined in claim 1 wherein the step of constructing the first hologram includes positioning the dispersion surface within the object-modified beam so that a space-spatial frequency product of an interference pattern recorded on the first hologram is less than said product would be if the object-modified beam were recorded as a hologram at the dispersion surface.
Claim 5
Dependent Claim
35 words
The method as defined by claim 1 wherein a high-quality imaging lens is positioned within the object-modified radiation beam to image said object into the surface across said beam wherein the dispersion function is positioned.
Claim 6
Dependent Claim
97 words
The method as defined by claim 1 wherein the step of constructing a second hologram includes the step of positioning a lens element within said conjugate object-modified beam between the second detector and the dispersion function pseudoscopic image, and wherein the step of reconstructing a wavefront from the second hologram includes the step of repositioning said lens element within the wavefront reconstructed from the second hologram between the second hologram and said dispersion function actual image, said lens element being located the same distance from the second hologram in both the second hologram construction and reconstruction steps.
Claim 7
Dependent Claim
30 words
The method as defined by claim 5 wherein said lens element is positioned during the step of constructing the second hologram to image the first hologram onto the second detector.
Claim 8
Dependent Claim
97 words
The method as defined in claim 1 wherein the step of constructing the first hologram includes the steps of positioning in the dispersed object-modified beam a lens element located between said surface upon which said beam is dispersed and said first detector, and wherein the step of reconstructing a wavefront from said first hologram includes the step of repositioning said lens between said first hologram and said real space reconstructed pseudoscopic image of the dispersion function, said lens element being located the same distance from the first hologram in both the first hologram construction and reconstruction steps.
Claim 9
Dependent Claim
39 words
The method as defined in claim 7 wherein said lens element is designed and positioned in the step of constructing the first hologram to image the object onto the first detector in the absence of dispersing said object-modified beam.
Claim 10
Dependent Claim
57 words
The method as defined in claim 7 wherein said lens element is designed and positioned in the step of constructing the first hologram to cooperate with another lens positioned between said object and the surface upon which said beam is dispersed to image the object onto the first detector in the absence of dispersing said object-modified beam.
Claim 11
Dependent Claim
33 words
The method as defined in claim 1 wherein the object-modified beam is dispersed across a given surface thereof by positioning across said surface a dispersing medium having a periodically varying phase function thereacross.
Claim 12
Dependent Claim
67 words
In the method of making a hologram by interfering an object information carrying beam with a reference beam at a finite angle to form an interference fringe pattern that is recorded on a hologram detector, the improvement wherein a dispersion plate having perIodically varying surface undulation of a parabolic shape is positioned across the path of said object information carrying beam prior to its striking said detector.
Claim 13
Dependent Claim
67 words
In the method of making a hologram by interfering an object information carrying beam with a reference beam at a finite angle to form an interference fringe pattern that is recorded on a hologram detector, the improvement wherein a dispersion plate having perIodically varying surface undulation of a parabolic shape is positioned across the path of said object information carrying beam prior to its striking said detector.
Claim 14
Dependent Claim
31 words
The method according to claim 11 wherein the periodically varying surface undulations include a large number of parabolic surfaces, each surface joining those surrounding it with an abrupt change in slope.
References Cited (Backward Citations)
US3449577A
Cited
US3484147A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |