US4449096A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Measuring head for magnetometer and magnetometer incorporating such a head
Assignee: Thales SA
•
Filing: 1980-12-03
•
Granted: 1984-05-15
•
Expires: 2000-12-03
Abstract
Abstract The invention relates to magnetometers making it possible to measure a magnetic field by the Faraday effect in a thin YIG layer which involves taking a YIG layer which is sufficiently thick to permit a multimode transmission of the polarized light beam, as well as the entrance and exit of said beam from the edge of the layer. This device makes it possible to produce a magnetometer head, whose elements are integrated on a substrate and whose volume is approximately 1 cm 3 .
Inventors
- 👤 Gerard Doriath
- 👤 Roger Gaudry
- 👤 Georges Hepner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:17
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02; G01R33/032; G01R33/0322
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
150 words
A measuring head for a magnetometer comprising: polarized light beam emitting means including a diode and a polarizer for producing a polarized light beam; magnetic field producing means; a planar layer of a magnetic material deposited on a substrate having a first and second edge with said polarizer being located near said first edge and wherein the thickness of said magnetic layer permits a multimode guided propagation of said beam in the plane of said layer and also permits the rotation of said beam in its polarization direction wherein said magnetic field producing means produces in said layer a magnetic field perpendicular to the propagation direction of said beam of polarized light and wherein said magnetic field is parallel to the plane of said layer; and means for measuring said rotation, wherein said rotation measuring means comprises an analyzer and a photodetector placed on the second edge of said layer.
Claim 2
Dependent Claim
150 words
A measuring head for a magnetometer comprising: polarized light beam emitting means including a diode and a polarizer for producing a polarized light beam; magnetic field producing means; a planar layer of a magnetic material deposited on a substrate having a first and second edge with said polarizer being located near said first edge and wherein the thickness of said magnetic layer permits a multimode guided propagation of said beam in the plane of said layer and also permits the rotation of said beam in its polarization direction wherein said magnetic field producing means produces in said layer a magnetic field perpendicular to the propagation direction of said beam of polarized light and wherein said magnetic field is parallel to the plane of said layer; and means for measuring said rotation, wherein said rotation measuring means comprises an analyzer and a photodetector placed on the second edge of said layer.
Claim 3
Dependent Claim
90 words
A head according to claim 1, wherein it also comprises a plate which is able to support said emitting diode, said polarizer, said analyzer and said photodetector, so as to bring about coincidence between the active area of said emitting diode and said photodetector with the edge of said magnetic material layer, said plate further including a first groove for facilitating the gripping of said polarizer between said emitting diode and said substrate and a second groove for facilitating the gripping of said analyzer between said photodetector and said substrate.
Claim 4
Dependent Claim
22 words
A head according to claim 1, wherein said emitting diode is a laser diode, and said polarizer and analyzer are polarizing films.
Claim 5
Dependent Claim
56 words
A head according to claim 1, wherein the rotation measuring means also comprise a coil making it possible to induce in the magnetic material layer a magnetic field which is parallel to the propagation direction in said planar layer said magnetic field having an alternating component and a component compensating the magnetic field to be measured.
Claim 6
Dependent Claim
33 words
A head according to claim 1, wherein said magnetic material is a yttrium, gallium garnet grown by epitaxy on a substrate of gadolinium gallium garnet with a thickness between 30 and 110 microns.
Claim 7
Dependent Claim
17 words
A head according to claim 1, wherein the wave-length of the polarized light is substantially 1.3 micron.
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) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |