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US4315693A
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Optical strapdown inertia system
Assignee: Individual
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Filing: 1979-12-31
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Granted: 1982-02-16
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Expires: 1999-12-31
Abstract
Abstract An optical strapdown inertial system using passive laser gyros and passive laser accelerometers and a computer. These components may be disposed on "chips" in integrated optics format to provide an all solid-state system having no moving parts.
Inventors
- 👤 Clifford G. Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:12
CPC Classifications
G; G01; G01C; G01C19/00; G01C19/58; G01C19/64; G01C19/72; G01C19/727
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
157 words
An optical strapdown inertial guidance system including: a. A vehicle having a gyro and an accelerometer respectively mounted in three mutually perpendicular intersecting planes to sense acceleration components in each plane; b. Said gyro including a passive ring Fabry-Perot interferemoter, and, a single frequency laser source to measure the difference in clockwise and counter clockwise lengths of the cavity caused by inertial rotation, electronic the cavity to resonance. c. Said accelerometers comprising a single frequency laser source, a resonant cavity having a birefringent material therein, a proof mass carried by said birefringent material, a first polarizer for polarizing the laser beam, means disposed between said cavity and said polarizer for changing the optical frequency of the laser beam, focusing means for focusing the output laser beam from said cavity, detector means for receiving said output laser beam, feedback circuit means connected to said photo detector means and said SAW to vary the frequency of said laser beam.
Claim 2
Dependent Claim
157 words
An optical strapdown inertial guidance system including: a. A vehicle having a gyro and an accelerometer respectively mounted in three mutually perpendicular intersecting planes to sense acceleration components in each plane; b. Said gyro including a passive ring Fabry-Perot interferemoter, and, a single frequency laser source to measure the difference in clockwise and counter clockwise lengths of the cavity caused by inertial rotation, electronic the cavity to resonance. c. Said accelerometers comprising a single frequency laser source, a resonant cavity having a birefringent material therein, a proof mass carried by said birefringent material, a first polarizer for polarizing the laser beam, means disposed between said cavity and said polarizer for changing the optical frequency of the laser beam, focusing means for focusing the output laser beam from said cavity, detector means for receiving said output laser beam, feedback circuit means connected to said photo detector means and said SAW to vary the frequency of said laser beam.
Claim 3
Dependent Claim
25 words
An optical strapdown inertial system as in claim 1 wherein said means disposed between said cavity and said polarizer is a surface acoustical wave cell.
Claim 4
Dependent Claim
16 words
An optical strapdown inertial system as in claim 2 wherein said detector means is a photodiode.
Claim 5
Dependent Claim
23 words
An optical strapdown inertial system as in claim 3 wherein said focusing means is a lens disposed between said cavity and said detector.
Claim 6
Dependent Claim
18 words
An optical strapdown inertial system as in claim 4 wherein said laser source is a GaAs diode laser.
Claim 7
Dependent Claim
27 words
An optical strapdown inertial system as in claim 5 wherein said laser, polarizers, mirrors, birefringement material, proof mass and said detector are monolithically integrated on a substrate.
Claim 8
Dependent Claim
14 words
An optical strapdown inertial system as in claim 6 wherein said substrate is silicon.
References Cited (Backward Citations)
US4233847A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-02-15 | 1985-08-17 | 1986-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-15 | 1989-08-17 | 1990-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-15 | 1993-08-17 | 1994-02-16 | $7700.00 | Window Closed / Lapsed |