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Patent US3996552A successfully refreshed from Google Patents.
US3996552A
Expired / Lapsed
US
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Device for providing a hologram of an insonified object
Assignee: Bendix Corp
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Filing: 1975-04-28
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Granted: 1976-12-07
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Expires: 1995-04-28
Abstract
Abstract A device for providing a hologram of an object which may be converted to an optical image in real time. The device is part of an acoustical holographic system which uses a source of coherent acoustic radiation to irradiate the object which reflects the acoustic radiation on to a piezoelectric transducer to provide a rapidly varying sinusoidal electronic charge pattern corresponding to the reflected acoustic radiation. Electrons are released from a photocathode, illuminated by a radiation source, in a spatial distribution of electron energies corresponding in space and time to the electronic charge pattern. A first grid positioned adjacent the photocathode is maintained at a potential to provide a modulated electron current which varies in space and time linearly in accordance with the acoustic input. The electron current is modulated by a second grid energized by a coherent reference voltage of fixed phase to function as a reference signal as used in holography. A microchannel plate electron multiplier amplifies the modulated electron current, and the amplified current is imaged on a high potential phosphor screen and provides an optical image of the hologram of the insonified object. The hologram may be converted into electric signals (video) by a conventional TV camera. For displaying an image of the object itself in real time, the video signals may be processed in an electro-optical Fourier transform converter tube, or may be processed by a fast Fourier transform computer and displayed on a cathode ray tube.
Inventors
- 👤 William G. Wolber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:04
CPC Classifications
F; F16; F16L; F16L1/00; F16L1/024; F16L1/06; G; G01; G01S; G01S15/00; G01S15/88; G01S15/89; G01S15/8906; G01S15/8965; G01S15/897; Y; Y10; Y10S; Y10S359/00; Y10S359/901
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
109 words
A device for converting acoustic radiation from a source which is reflected from an object into a hologram, comprising a piezoelectric transducer for receiving the reflected acoustic radiation and providing an electronic charge pattern corresponding thereto, a source of electrons associated with the piezoelectric transducer for providing a spatial electron current modulated by the electronic charge pattern, means for biasing the electron current in a linear region of the cathode current-grid voltage curve, and means for modulating the biased electron current by a reference voltage of fixed phase relative to the acoustic source to provide a spatial electron current having a component corresponding to the hologram of the object.
Claim 2
Independent Claim
109 words
A device for converting acoustic radiation from a source which is reflected from an object into a hologram, comprising a piezoelectric transducer for receiving the reflected acoustic radiation and providing an electronic charge pattern corresponding thereto, a source of electrons associated with the piezoelectric transducer for providing a spatial electron current modulated by the electronic charge pattern, means for biasing the electron current in a linear region of the cathode current-grid voltage curve, and means for modulating the biased electron current by a reference voltage of fixed phase relative to the acoustic source to provide a spatial electron current having a component corresponding to the hologram of the object.
Claim 3
Dependent Claim
27 words
A device for providing a hologram of an object as described in claim 1, in which the reference voltage is the same frequency as the acoustic source.
Claim 4
Dependent Claim
33 words
A device for providing a hologram of an object as described in claim 1 in which the means for biasing the electron current is a grid in the form of a fine mesh.
Claim 5
Dependent Claim
34 words
A device for providing a hologram of an object as described in claim 1 in which the means for modulating the biased electron current is a grid in the form of a fine mesh.
Claim 6
Dependent Claim
28 words
A device for providing a hologram of an object as described in claim 1 in which the source of electrons is a photocathode modulated by a radiation source.
Claim 7
Dependent Claim
31 words
A device for providing a hologram of an object as described in claim 5 in which the photocathode is made of platinum and is irradiated by a quasi-monochromatic ultraviolet light source.
Claim 8
Dependent Claim
32 words
A device for providing a hologram of an object as described in claim 6 in which the quasi-monochromatic ultraviolet light source is a mercury source with a line near 2000 nanometers wavelength.
Claim 9
Dependent Claim
48 words
A device for providing a hologram of an object as described in claim 6 in which the biasing means comprises a grid in the form of a fine mesh which is energized by a voltage source of approximately -0.45 volts relative to the potential of the piezoelectric transducer.
Claim 10
Dependent Claim
49 words
A device for providing a hologram of an object as described in claim 8 in which the modulating means comprises a grid in the form of a fine mesh which is energized by a voltage source of approximately 1000 volts peak to peak A.C. relative to the biasing grid.
Claim 11
Dependent Claim
33 words
A device for providing a hologram of an object as described in claim 1 including a microchannel plate electron multiplier for amplifying the spatial electron current corresponding to the hologram of the object.
Claim 12
Dependent Claim
34 words
A device for providing a hologram of an object as described in claim 10 including means for converting the amplified spatial electron current corresponding to the hologram to an optical image of the hologram.
Claim 13
Dependent Claim
32 words
A device for providing a hologram of an object as described in claim 11 in which the means for converting the amplified spatial current to an optical image is a phosphor screen.
Claim 14
Independent Claim
112 words
A device for providing a hologram of an object comprising a source of coherent acoustic radiation for irradiating the object, a piezoelectric transducer for receiving acoustic radiation reflected from the object and providing an electronic charge pattern corresponding thereto, a source of electrons associated with the piezoelectric transducer for providing a spatial electron current modulated by the electronic charge pattern, means for biasing the electron current in a linear region of the cathode current-grid voltage curve, and means for modulating the biased electron current by a reference voltage of fixed phase relative to the acoustic source to provide a spatial electron current with a component corresponding to the hologram of the object.
Claim 15
Independent Claim
112 words
A device for providing a hologram of an object comprising a source of coherent acoustic radiation for irradiating the object, a piezoelectric transducer for receiving acoustic radiation reflected from the object and providing an electronic charge pattern corresponding thereto, a source of electrons associated with the piezoelectric transducer for providing a spatial electron current modulated by the electronic charge pattern, means for biasing the electron current in a linear region of the cathode current-grid voltage curve, and means for modulating the biased electron current by a reference voltage of fixed phase relative to the acoustic source to provide a spatial electron current with a component corresponding to the hologram of the object.
Claim 16
Dependent Claim
33 words
A device for providing a hologram of an object as described in claim 13 including a microchannel plate electron multiplier for amplifying the spatial electron current corresponding to the hologram of the object.
Claim 17
Dependent Claim
34 words
A device for providing a hologram of an object as described in claim 14 including means for converting the amplified spatial electron current corresponding to the hologram to an optical image of the hologram.
Claim 18
Dependent Claim
32 words
A device for providing a hologram of an object as described in claim 15 in which the means for converting the amplified spatial current to an optical image is a phosphor screen.
Claim 19
Dependent Claim
60 words
A holographic sonar system comprising a device for providing a hologram of an object as described in claim 15, and means for transducing the optical image of the hologram into a video output, means for providing an electrical image of the object from the video signal and means for converting the electrical image into an optical image of the object.
Claim 20
Dependent Claim
29 words
A holographic sonar system as described in claim 17 in which the means for transducing the optical image of a hologram into a video output includes a video camera.
Claim 21
Dependent Claim
31 words
A holographic sonar system as described in claim 17 in which the means for providing an electrical image of the object from the video signal includes a fast Fourier transform computer.
Claim 22
Dependent Claim
30 words
A holographic sonar system as described in claim 17 in which the means for converting the electrical image into an optical image of the object includes a cathode ray tube.
Claim 23
Dependent Claim
69 words
A holographic sonar system comprising a device for providing a hologram of an object as described in claim 15, and a video camera for transducing the optical image of the hologram into a video output, a fast Fourier transform computer for providing an electrical image of the object from the video signal, and a cathode ray tube for converting the electrical image into an optical image of the object.
Claim 24
Dependent Claim
46 words
A holographic sonar system comprising a device for providing a hologram of an object as described in claim 21 which includes a contrast circuit connected to the video camera for attenuating fixed components of the video output corresponding to a fixed brightness field to enhance contrast.
References Cited (Backward Citations)
US3879700A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-07 | 1980-06-07 | 1980-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-07 | 1984-06-07 | 1984-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-07 | 1988-06-07 | 1988-12-07 | $7700.00 | Window Closed / Lapsed |