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US3605013A
Expired / Lapsed
US
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Current-measuring system utilizing faraday effect element
Assignee: Nippon Selfoc Co Ltd
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Filing: 1969-11-07
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Granted: 1971-09-14
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Expires: 1989-11-07
Abstract
Abstract A current-measuring system comprises a fiberlike light guide capable of causing the Faraday effect. The guide is adapted to be placed in proximity to a current-carrying conductor. Polarized light is applied to one end of the guide, and the output of the guide is applied to an analyzer and a detector, thereby to provide an indication of the magnitude of the current flow in the conductor.
Inventors
- 👤 Shogo Yoshikawa
- 👤 Atsufumi Ueki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:34
CPC Classifications
G; G01; G01R; G01R15/00; G01R15/14; G01R15/24; G01R15/245; G01R15/246
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
156 words
A system for measuring the current flowing through a longitudinal conductor, said system comprising a flexible fiberlike transparent body having a refractive index which is greatest at the axis of said body and decreasing gradually toward the periphery thereof, at least a part of said body comprising material capable of causing the Faraday effect, a source of laser light rays, said part of the body being wound about but insulated from the conductor, a polarizer disposed intermediate said light source and the input end of said body for linearly polarizing said light ways incident thereon, an analyzer disposed at the output end of said body with its optical axis in a predetermined angle with respect to that of said polarizer, said analyzer and polarizer being located remote from said body part and from the conductor, and means coupled to said analyzer for providing an indication of the measured current corresponding to the output of said analyzer.
Claim 2
Independent Claim
156 words
A system for measuring the current flowing through a longitudinal conductor, said system comprising a flexible fiberlike transparent body having a refractive index which is greatest at the axis of said body and decreasing gradually toward the periphery thereof, at least a part of said body comprising material capable of causing the Faraday effect, a source of laser light rays, said part of the body being wound about but insulated from the conductor, a polarizer disposed intermediate said light source and the input end of said body for linearly polarizing said light ways incident thereon, an analyzer disposed at the output end of said body with its optical axis in a predetermined angle with respect to that of said polarizer, said analyzer and polarizer being located remote from said body part and from the conductor, and means coupled to said analyzer for providing an indication of the measured current corresponding to the output of said analyzer.
Claim 3
Dependent Claim
13 words
The measuring system of claim 1, in which said predetermined angle is 45*.
Claim 4
Dependent Claim
14 words
The measuring system of claim 1, in which said light source is a laser.
Claim 5
Dependent Claim
13 words
The measuring system of claim 1, in which said body material is paramagnetic.
Claim 6
Dependent Claim
13 words
The measuring device of claim 1, in which said body material is diamagnetic.
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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |