US3715482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Holographic imaging by simultaneous source and receiver scanning
Assignee: BNY Mellon NA
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Filing: 1971-10-12
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Granted: 1973-02-06
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Expires: 1991-10-12
Abstract
Abstract 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.
Inventors
- 👤 K Haines
- 👤 B Hildebrand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:28
CPC Classifications
G; G03; G03H; G03H3/00; G03H1/00; G03H1/26; G03H1/2645; G03H2001/2655; G03H2222/00; G03H2222/36
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
181 words
A method of constructing a hologram of an object, comprising the steps of: illuminating the object with a point source of coherent radiation, thereby generating an object-modified radiation wavefront, positioning in the path of the objecT-modified radiation wavefront a point radiation receiver which generates an electrical signal proportional to the radiation intensity incident thereon, scanning the source and receiver over respective two dimensional surface areas 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 with the electrical signal generated by the receiver a reference electrical signal coherent with the object illuminating radiation, thereby to produce holographic information of the object in the form of a time varying electrical signal, and forming an optical hologram by intensity modulating a beam of radiation with said holographic information electrical signal and by scanning the modulated radiation beam in a raster pattern over a two-dimensional radiation sensitive surface.
Claim 2
Independent Claim
181 words
A method of constructing a hologram of an object, comprising the steps of: illuminating the object with a point source of coherent radiation, thereby generating an object-modified radiation wavefront, positioning in the path of the objecT-modified radiation wavefront a point radiation receiver which generates an electrical signal proportional to the radiation intensity incident thereon, scanning the source and receiver over respective two dimensional surface areas 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 with the electrical signal generated by the receiver a reference electrical signal coherent with the object illuminating radiation, thereby to produce holographic information of the object in the form of a time varying electrical signal, and forming an optical hologram by intensity modulating a beam of radiation with said holographic information electrical signal and by scanning the modulated radiation beam in a raster pattern over a two-dimensional radiation sensitive surface.
Claim 3
Independent Claim
181 words
A method of constructing a hologram of an object, comprising the steps of: illuminating the object with a point source of coherent radiation, thereby generating an object-modified radiation wavefront, positioning in the path of the objecT-modified radiation wavefront a point radiation receiver which generates an electrical signal proportional to the radiation intensity incident thereon, scanning the source and receiver over respective two dimensional surface areas 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 with the electrical signal generated by the receiver a reference electrical signal coherent with the object illuminating radiation, thereby to produce holographic information of the object in the form of a time varying electrical signal, and forming an optical hologram by intensity modulating a beam of radiation with said holographic information electrical signal and by scanning the modulated radiation beam in a raster pattern over a two-dimensional radiation sensitive surface.
Claim 4
Independent Claim
181 words
A method of constructing a hologram of an object, comprising the steps of: illuminating the object with a point source of coherent radiation, thereby generating an object-modified radiation wavefront, positioning in the path of the objecT-modified radiation wavefront a point radiation receiver which generates an electrical signal proportional to the radiation intensity incident thereon, scanning the source and receiver over respective two dimensional surface areas 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 with the electrical signal generated by the receiver a reference electrical signal coherent with the object illuminating radiation, thereby to produce holographic information of the object in the form of a time varying electrical signal, and forming an optical hologram by intensity modulating a beam of radiation with said holographic information electrical signal and by scanning the modulated radiation beam in a raster pattern over a two-dimensional radiation sensitive surface.
Claim 5
Dependent Claim
26 words
The method as defined by claim 1 wherein the source, receiver and modulated radiation beam travel at uniform speeds throughout the scanning of their respective surfaces.
Claim 6
Dependent Claim
69 words
The method as defined by claim 1 wherein the ratio of the source and receiver speeds is unity, whereby at any given instant the source and receiver are traveling at the same speed, and wherein said modulated radiation beam is scanned over said radiation sensitive surface with a speed related to the common speed of the source and receiver by a constant at all times throughout the scanning process.
Claim 7
Dependent Claim
17 words
The method as defined by claim 1 wherein the object is held stationary relative to its surroundings.
References Cited (Backward Citations)
US3120577A
Cited
US3461420A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |