US4419895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cantilevered-beam, fiber-optic angular accelerometer
Assignee: Lockheed Martin Corp
•
Filing: 1982-01-25
•
Granted: 1983-12-13
•
Expires: 2002-01-25
Abstract
Abstract An angular accelerometer comprising a pair of misaligned, spaced apart, cantilevered optical fibers whereby angular accelerations occasion modulation of an optical signal coupled between the two spaced apart, cantilevered-beam optical fibers.
Inventors
- 👤 Harrison W. Fuller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:41
CPC Classifications
G; G01; G01P; G01P15/00; G01P15/02; G01P15/08; G01P15/093
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
83 words
An angular accelerometer, comprising: a first optical fiber arranged as a cantilevered-beam; a second optical fiber arranged as a cantilevered-beam spaced and offset from such first optical fiber such that optical coupling between said first and second optical fibers varies proportionately to angular accelerations about an axis perpendicular to the fiber axes and perpendicular to the direction of offset; and means for mass loading each of said first and second optical fibers with a mass loading member which is non-responsive to magnetic fields.
Claim 2
Dependent Claim
83 words
An angular accelerometer, comprising: a first optical fiber arranged as a cantilevered-beam; a second optical fiber arranged as a cantilevered-beam spaced and offset from such first optical fiber such that optical coupling between said first and second optical fibers varies proportionately to angular accelerations about an axis perpendicular to the fiber axes and perpendicular to the direction of offset; and means for mass loading each of said first and second optical fibers with a mass loading member which is non-responsive to magnetic fields.
Claim 3
Dependent Claim
29 words
An angular accelerometer as defined in claim 1, further including means for applying light to said first optical fiber and means for detecting light from said second optical fiber.
Claim 4
Dependent Claim
20 words
An angular accelerometer as defined in claim 1, further including a housing for containing said first and second optical fibers.
Claim 5
Dependent Claim
15 words
An angular accelerometer as defined in claim 3, wherein said housing contains a damping fluid.
Claim 6
Dependent Claim
19 words
An angular accelerometer as defined in claim 1, wherein said optical fibers have a coating thereon to provide damping.
Claim 7
Dependent Claim
19 words
An angular accelerometer as defined in claim 1, further including means for stiffening said first and second optical fibers.
Claim 8
Dependent Claim
22 words
An angular accelerometer as defined in claim 6, wherein said stiffening means includes sleeves disposed about said first and second optical fibers.
Claim 9
Dependent Claim
23 words
An angular accelerometer as defined in claim 6, wherein said stiffening means includes flat strips affixed to said first and second optical fibers.
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) | 1986-12-12 | 1987-06-13 | 1987-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-12 | 1991-06-13 | 1991-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-12 | 1995-06-13 | 1995-12-13 | $7700.00 | Window Closed / Lapsed |