Patent US4368430A successfully refreshed from Google Patents.
US4368430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber optic magnetic sensors
Assignee: Lockheed Martin Corp
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Filing: 1980-08-18
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Granted: 1983-01-11
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Expires: 2000-08-18
Abstract
Abstract A magnetometer which includes a pair of spaced apart optical fibers at least one of which comprises a cantilevered beam having a dipolar magnet thereon such that fluctuations of the magnetic H field will cause fluctuating mechanical torque on the magnet which will be applied to the cantilevered optical fiber to deflect same and occasion modulation of an optical signal transmitted between the two fibers.
Inventors
- 👤 John C. Dale
- 👤 Glen A. Rines
- 👤 Harrison W. Fuller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:41
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02; G01R33/038; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/842; Y10S505/843; Y10S505/845
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
111 words
A magnetic sensor, comprising: a first optical fiber, said first optical fiber being arranged as a cantilevered beam, and including a first dipolar magnet mounted on said cantilevered first optical fiber; a second optical fiber spaced from said first optical fiber so as to produce a gap between the ends thereof, said second optical fiber being arranged as a cantilevered beam; and a second dipolar magnet mounted on said cantilevered second optical fiber such that the optical coupling between said optical fibers varies proportionally to fluctuations of a component of the magnetic field substantially orthogonal to the longitudinal axes of said cantilevered beams which causes fluctuating magnetic torque on said magnets.
Claim 2
Dependent Claim
111 words
A magnetic sensor, comprising: a first optical fiber, said first optical fiber being arranged as a cantilevered beam, and including a first dipolar magnet mounted on said cantilevered first optical fiber; a second optical fiber spaced from said first optical fiber so as to produce a gap between the ends thereof, said second optical fiber being arranged as a cantilevered beam; and a second dipolar magnet mounted on said cantilevered second optical fiber such that the optical coupling between said optical fibers varies proportionally to fluctuations of a component of the magnetic field substantially orthogonal to the longitudinal axes of said cantilevered beams which causes fluctuating magnetic torque on said magnets.
Claim 3
Dependent Claim
23 words
The sensor of claim 1 wherein the ends of said first and second fibers are misaligned to increase the sensitivity of said sensor.
Claim 4
Dependent Claim
43 words
The sensor of claims 1 or 2 further including means for applying light to said second optical fiber and means coupled to said first optical fiber to detect the amount of light transmitted from said second optical fiber to said first optical fiber.
Claim 5
Dependent Claim
120 words
A magnetic sensor, comprising: a first optical fiber, said first optical fiber arranged as a cantilevered beam, and including a first dipolar magnet mounted on said cantilevered first optical fiber; a second optical fiber spaced from said first optical fiber so as to produce a gap between the ends thereof, said second optical fiber being arranged as a cantilevered beam; and a second dipolar magnet mounted on said cantilevered second optical fiber in polarity opposition to said first dipolar magnet such that the optical coupling between said optical fibers varies proportionally to fluctuations of a spacially varying component of the magnetic field substantially orthogonal to the longitudinal axes of said cantilevered beams which causes fluctuating magnetic torque on said magnets.
Claim 6
Dependent Claim
120 words
A magnetic sensor, comprising: a first optical fiber, said first optical fiber arranged as a cantilevered beam, and including a first dipolar magnet mounted on said cantilevered first optical fiber; a second optical fiber spaced from said first optical fiber so as to produce a gap between the ends thereof, said second optical fiber being arranged as a cantilevered beam; and a second dipolar magnet mounted on said cantilevered second optical fiber in polarity opposition to said first dipolar magnet such that the optical coupling between said optical fibers varies proportionally to fluctuations of a spacially varying component of the magnetic field substantially orthogonal to the longitudinal axes of said cantilevered beams which causes fluctuating magnetic torque on said magnets.
Claim 7
Dependent Claim
41 words
The sensor of claim 4, further including means for applying light to said second optical fiber and means coupled to said first optical fiber to detect the amount of light transmitted from said second optical fiber to said first optical fiber.
Claim 8
Dependent Claim
24 words
The sensor of claim 4 wherein the ends of said first and second optical fibers are misaligned to increase the sensitivity of said sensor.
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) | 1986-01-10 | 1986-07-12 | 1987-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-10 | 1990-07-12 | 1991-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-10 | 1994-07-12 | 1995-01-11 | $7700.00 | Window Closed / Lapsed |