US3980949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magneto-optical measuring transducer for very high currents/voltages
Assignee: Siemens AG
•
Filing: 1974-09-13
•
Granted: 1976-09-14
•
Expires: 1994-09-13
Abstract
Abstract A magneto-optical measuring transducer for use as a Faraday rotator in a device to measure high currents/voltages in response to a magnetic field created by the current to be measured by rotating the direction of polarization of a beam of polarized light characterized by the transducer having a first magnetically saturable part and a second part which has a paramagnetic behavior. The first part preferably consists of yttrium-iron-garnet layer and the second part of a gadolinium-gallium-garnet plate.
Inventors
- 👤 Ernst Feldtkeller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:19
CPC Classifications
G; G01; G01R; G01R15/00; G01R15/14; G01R15/24; G01R15/245; G01R15/246; G02; G02F; G02F1/00; G02F1/01; G02F1/09
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
114 words
A unitary magneto-optical measuring transducer for use as a Faraday rotator in a device for measuring high currents at high voltages, responsive to a magnetic field produced by a current which is to be measured for rotating the direction of polarization of a beam of polarized light which passes therethrough, said transducer comprising a first magnetically saturable part and a second part which has a diamagnetic or paramagnetic behavior, said first and second parts being formed as two parts of a single unitary structure and arranged to be traversed by the polarized beam of light, said second part comprising a gadolinium-gallium-garnet plate having a thickness substantially greater than the thickness of said first part.
Claim 2
Dependent Claim
114 words
A unitary magneto-optical measuring transducer for use as a Faraday rotator in a device for measuring high currents at high voltages, responsive to a magnetic field produced by a current which is to be measured for rotating the direction of polarization of a beam of polarized light which passes therethrough, said transducer comprising a first magnetically saturable part and a second part which has a diamagnetic or paramagnetic behavior, said first and second parts being formed as two parts of a single unitary structure and arranged to be traversed by the polarized beam of light, said second part comprising a gadolinium-gallium-garnet plate having a thickness substantially greater than the thickness of said first part.
Claim 3
Dependent Claim
128 words
A unitary magneto-optical measuring transducer for use as a Faraday rotator in a device for measuring high currents at high voltages, responsive to a magnetic field produced by a current which is to be measured rotating the direction of polarization of a beam of polarized light which passes therethrough, said transducer comprising a first magnetically saturable part and a second part which has a diamagnetic or paramagnetic behavior, said first and second parts being formed as two parts of a single unitary structure and arranged to be traversed by the polarized beam of light, said first part consisting of a layer of yttrium-iron-garnet and the second part consisting of a gadolinium-gallium-garnet plate, the thickness of said gadolinium-gallium-garnet plate being substantially greater than the thickness of said yttrium-iron-garnet layer.
Claim 4
Dependent Claim
128 words
A unitary magneto-optical measuring transducer for use as a Faraday rotator in a device for measuring high currents at high voltages, responsive to a magnetic field produced by a current which is to be measured rotating the direction of polarization of a beam of polarized light which passes therethrough, said transducer comprising a first magnetically saturable part and a second part which has a diamagnetic or paramagnetic behavior, said first and second parts being formed as two parts of a single unitary structure and arranged to be traversed by the polarized beam of light, said first part consisting of a layer of yttrium-iron-garnet and the second part consisting of a gadolinium-gallium-garnet plate, the thickness of said gadolinium-gallium-garnet plate being substantially greater than the thickness of said yttrium-iron-garnet layer.
Claim 5
Dependent Claim
101 words
A Faraday rotator for measuring electric current comprising means responsive to said current for producing a single magnetic field, a magneto-optical transducer disposed in said magnetic field, and means for passing a beam of polarized light through said transducer, whereby the direction of polarization of said beam is rotated in response to said magnetic field, said transducer comprising a first magnetically saturable part and a second part which has a diamagnetic or paramagnetic behavior, said first part consisting of a layer of yttrium-iron-garnet and said second part consisting of a layer of gadolinium-gallium-garnet having a thickness greater than said yttrium-iron-garnet layer.
Claim 6
Dependent Claim
101 words
A Faraday rotator for measuring electric current comprising means responsive to said current for producing a single magnetic field, a magneto-optical transducer disposed in said magnetic field, and means for passing a beam of polarized light through said transducer, whereby the direction of polarization of said beam is rotated in response to said magnetic field, said transducer comprising a first magnetically saturable part and a second part which has a diamagnetic or paramagnetic behavior, said first part consisting of a layer of yttrium-iron-garnet and said second part consisting of a layer of gadolinium-gallium-garnet having a thickness greater than said yttrium-iron-garnet layer.
Claim 7
Dependent Claim
19 words
A magneto-optical measuring transducer according to claim 2, wherein the thickness of said gadolinium-gallium-garnet plate is approximtely 1 mm.
Claim 8
Dependent Claim
19 words
A Faraday rotator according to claim 3, in which the thickness of said gadolinium-gallium-garnet layer is approximately 1 mm.
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) | 1979-09-14 | 1980-03-15 | 1980-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-14 | 1984-03-15 | 1984-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-14 | 1988-03-15 | 1988-09-14 | $7700.00 | Window Closed / Lapsed |