US3743929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current reducers utilizing the faraday effect
Assignee: Alstom Savoisienne SA
•
Filing: 1970-11-06
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Granted: 1973-07-03
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Expires: 1990-11-06
Abstract
Abstract Improvement regarding current reducers utilizing the Faraday effect of magneto-optical rotation of polarized light, characterized in that a first beam passes through a first polarizer prior to penetrating into a magneto-optical material and is analyzed by a second polarizer at the output of the magneto-optical material, and in that a second beam is polarized by said second polarizer and analyzed by said first polarizer, the two polarizers having their axes of polarization shifted by certain angle.
Inventors
- 👤 G Lesueur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:10
CPC Classifications
G; G01; G01R; G01R15/00; G01R15/14; G01R15/24; G01R15/245; G01R15/246
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
148 words
A device for measuring the intensity of a current flowing in a high voltage conductor with the aid of the Faraday effect, comprising a magneto-optical device excited by a magnetic field produced by the current in said conductor to be measured, means for generating first and second luminous beams along respective paths through said magneto-optical device, and a first and a second polarizer, said first polarizer being positioned in the path of said first luminous beam upstream of said magneto-optical device and in the path of said second luminous beam downstream of said magneto-optical device, said second polarizer being positioned in the path of said first luminous beam downstream of said magneto-optical device and in the path of said second luminous beam upstream of said magnetooptical device, the axes of polarization of said first and second polarizers being shifted with respect to each other by a predetermined angle.
Claim 2
Independent Claim
148 words
A device for measuring the intensity of a current flowing in a high voltage conductor with the aid of the Faraday effect, comprising a magneto-optical device excited by a magnetic field produced by the current in said conductor to be measured, means for generating first and second luminous beams along respective paths through said magneto-optical device, and a first and a second polarizer, said first polarizer being positioned in the path of said first luminous beam upstream of said magneto-optical device and in the path of said second luminous beam downstream of said magneto-optical device, said second polarizer being positioned in the path of said first luminous beam downstream of said magneto-optical device and in the path of said second luminous beam upstream of said magnetooptical device, the axes of polarization of said first and second polarizers being shifted with respect to each other by a predetermined angle.
Claim 3
Dependent Claim
33 words
A device as defined in claim 1, wherein said means for generating first and second luminous beams includes directing means for directing said first and second beams along parallel paths in opposite directions.
Claim 4
Dependent Claim
60 words
A device as defined in claim 1, wherein said first and second polarizers are positioned side-by-side against one face of said magneto-optical device so that said first and second luminous beams penetrating into said magneto-optical device by way of said one face are reflected on an opposite face of said device to thereby pass out again through said one face.
Claim 5
Dependent Claim
31 words
A device as defined in claim 1 further including means for detecting the respective intensities of said first and second luminous beams at the end of said first and second paths.
Claim 6
Dependent Claim
33 words
A device as defined in claim 4, wherein said means for generating first and second luminous beams includes directing means for directing said first and second beams along parallel paths in opposite directions.
Claim 7
Dependent Claim
28 words
A device as defined in claim 5, wherein said directing means includes first and second light conducting conduits connecting a light source to said first and second polarizers.
Claim 8
Dependent Claim
28 words
A device as defined in claim 6, wherein said detecting means comprises a pair of photodetectors generating respective signals indicative of the intensities of the light detected thereby.
Claim 9
Dependent Claim
20 words
A device As defined in claim 7, further including means connected to said photodetectors for comparing the signal outputs thereof.
Claim 10
Dependent Claim
49 words
A device as defined in claim 1, further including a pair of photo detectors for detecting the respective intensities of said first and second luminous beams at the end of said first and second paths and means for comparing the signal outputs of said photo detectors with each other.
Claim 11
Dependent Claim
19 words
A device as defined in claim 1, wherein each of said first and second polarizers is a linear polarizer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |