US4329580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber optic, liquid crystal display electrical measurement system
Assignee: United States Department of the Army
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Filing: 1980-08-25
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Granted: 1982-05-11
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Expires: 2000-08-25
Abstract
Abstract The electromagnetic energy is captured by the antenna and changes the reftivity of a Liquid Crystal Display (LCD) proportional to the field being measured. The LCD is illuminated by a fiber optic and this light is reflected from LCD proportional to the electromagnetic field. This field proportional light is captured by a fiber optic and transmitted to a photodetector where it is converted to an electrical signal proportional to the electric field. This electrical signal may then be displayed, recorded or processed with other information.
Inventors
- 👤 Leon H. Riley
- 👤 George R. Edlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:28
CPC Classifications
G; G01; G01R; G01R15/00; G01R15/14; G01R15/24; G01R15/241; G01R29/00; G01R29/08; G01R29/0864; G01R29/0892
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
108 words
A testing device comprising antenna means for detecting the intensity of a field to be measured; conversion means for converting an output of the antenna into a DC output; a liquid crystal having its inputs connected to said DC outputs so as to change reflectivity of the crystal in accordance with the value of the DC output; a light means positioned relative to the crystals so as to direct light thereon; transmitting means positioned relative to the crystal so as to detect light that is reflected off of said crystal; and a detector means connected to said transmitting means to receive the light reflected from said liquid crystal.
Claim 2
Dependent Claim
108 words
A testing device comprising antenna means for detecting the intensity of a field to be measured; conversion means for converting an output of the antenna into a DC output; a liquid crystal having its inputs connected to said DC outputs so as to change reflectivity of the crystal in accordance with the value of the DC output; a light means positioned relative to the crystals so as to direct light thereon; transmitting means positioned relative to the crystal so as to detect light that is reflected off of said crystal; and a detector means connected to said transmitting means to receive the light reflected from said liquid crystal.
Claim 3
Dependent Claim
30 words
A testing device as set forth in claim 1 wherein said transmitting means is a fiber optics of such length that the detector means is located remote from said antenna.
Claim 4
Dependent Claim
39 words
A testing device as set forth in claim 2 further comprising a second fiber optics positioned between said light means and said liquid crystal so as to allow said light means to be located remote from said liquid crystal.
Claim 5
Dependent Claim
31 words
A testing device as set forth in claim 1 or 3 wherein said detector means is a photodetector having an output proportional to the intensity of the field to be measured.
Claim 6
Dependent Claim
27 words
A testing device as set forth in claim 4 wherein said fiber optics are nonconductive with respect to the electromagnetic frequency range of field to be measured.
References Cited (Backward Citations)
US4247858A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-10 | 1985-11-09 | 1986-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-10 | 1989-11-09 | 1990-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-10 | 1993-11-09 | 1994-05-11 | $7700.00 | Window Closed / Lapsed |