Patent US4533829A successfully refreshed from Google Patents.
US4533829A
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US
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Optical electromagnetic radiation detector
Assignee: United States, REPRESENTED BY SECRETARY OR AIR FORCE
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Filing: 1983-07-07
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Granted: 1985-08-06
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Expires: 2003-07-07
Abstract
Abstract An optical electromagnetic radiation detector having a probe for receiving nearby electromagnetic radiation. The probe includes a loop antenna connected to a pair of transparent electrodes deposited on the end surfaces of an electro-optic Fabry-Perot interferometer. When the loop antenna picks up the presence of electromagnetic radiation, a voltage will be developed across the crystal of the electro-optic Fabry-Perot interferometer thereby changing the optical length of the interferometer. A beam of light from a remote location is transmitted through an optical fiber onto the Fabry-Perot interferometer. The change in optical length of the Fabry-Perot interferometer alters the intensity of the beam of light as it is reflected from the Fabry-Perot interferometer back through the optical fiber to the remote location. A beamsplitter directs this reflected beam of light onto an intensity detector in order to provide an output indicative of the variations in intensity. The variations in intensity are directly related to the strength of the electromagnetic radiation received by the loop antenna.
Inventors
- 👤 William J. Miceli
- 👤 Jacques E. Ludman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:57
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/10; G01R; G01R29/00; G01R29/08; G01R29/0864; G01R29/0878; G01R29/0885; G02; G02F; G02F1/00; G02F1/01; G02F1/03; G02F1/21; G02F1/213
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
238 words
An optical electromagnetic radiation detector comprising: an electro-optic Fabry-Perot interferometer positioned at a first location, said interferometer being made up of an electro-optic material having a pair of opposed surfaces and a pair of transparent electrodes secured to said electro-optic material; means electrically connected to said electrodes for receiving nearby electromagnetic radiation and causing a voltage to be developed across said electro-optic material, said voltage altering the effective length of said electro-optic material thereby changing the resonant condition of said electro-optic Fabry-Perot interferometer; means positioned at a second location for providing a monochromatic beam of light; means having one end thereof optically aligned with said monochromatic beam of light for transmitting said beam of light out the other end thereof to said Fabry-Perot interferometer, said surfaces of said Fabry-Perot interferometer reflecting said beam of light back into said other end of said transmitting means; means adjacent said one end of said transmitting means for receiving said reflected beam of light and directing said reflected beam of light in a predetermined direction away from said light providing means; and means optically aligned with said light receiving and directing means for receiving said reflected beam of light therefrom and detecting any variations in the intensity in said reflected beam of light; whereby said variations in said intensity of said reflected beam of light is directly related to the strength of said electromagnetic radiation received by said electromagnetic radiation receiving means.
Claim 2
Dependent Claim
238 words
An optical electromagnetic radiation detector comprising: an electro-optic Fabry-Perot interferometer positioned at a first location, said interferometer being made up of an electro-optic material having a pair of opposed surfaces and a pair of transparent electrodes secured to said electro-optic material; means electrically connected to said electrodes for receiving nearby electromagnetic radiation and causing a voltage to be developed across said electro-optic material, said voltage altering the effective length of said electro-optic material thereby changing the resonant condition of said electro-optic Fabry-Perot interferometer; means positioned at a second location for providing a monochromatic beam of light; means having one end thereof optically aligned with said monochromatic beam of light for transmitting said beam of light out the other end thereof to said Fabry-Perot interferometer, said surfaces of said Fabry-Perot interferometer reflecting said beam of light back into said other end of said transmitting means; means adjacent said one end of said transmitting means for receiving said reflected beam of light and directing said reflected beam of light in a predetermined direction away from said light providing means; and means optically aligned with said light receiving and directing means for receiving said reflected beam of light therefrom and detecting any variations in the intensity in said reflected beam of light; whereby said variations in said intensity of said reflected beam of light is directly related to the strength of said electromagnetic radiation received by said electromagnetic radiation receiving means.
Claim 3
Dependent Claim
35 words
An optical electromagnetic radiation detector as defined in claim 1 wherein said electro-optic Fabry-Perot interferometer and said means for receiving said electromagnetic radiation are contained within a housing in order to form a compact probe.
Claim 4
Dependent Claim
23 words
An optical electromagnetic radiation detector as defined in claim 2 wherein said means for transmitting said beam of light comprises an optical fiber.
Claim 5
Dependent Claim
35 words
An optical electromagnetic radiation detector as defined in claim 3 wherein said probe housing further includes means for coupling said light beam emanating from said other end of said optical fiber into said Fabry-Perot interferometer.
Claim 6
Dependent Claim
23 words
An optical electromagnetic radiation detector as defined in claim 4 wherein said means for receiving said nearby electromagnetic radiation comprises a loop antenna.
Claim 7
Dependent Claim
22 words
An optical electromagnetic radiation detector as defined in claim 5 wherein said means for providing said beam of light comprises a laser.
Claim 8
Dependent Claim
23 words
An optical electromagnetic radiation detector as defined in claim 6 wherein said means for directing said reflected beam of light comprises a beamsplitter.
Claim 9
Dependent Claim
18 words
An optical electromagnetic radiation detector as defined in claim 7 wherein said detecting means comprises an avalanche photodiode.
Claim 10
Dependent Claim
23 words
An optical electromagnetic radiation detector as defined in claim 1 wherein said means for transmitting said beam of light comprises an optical fiber.
Claim 11
Dependent Claim
22 words
An optical electromagnetic radiation detector as defined in claim 9 wherein said means for providing said beam of light comprises a laser.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-05 | 1989-02-04 | 1989-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-05 | 1993-02-04 | 1993-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-05 | 1997-02-04 | 1997-08-06 | $7700.00 | Window Closed / Lapsed |