GB2021851A - Ring laser gyroscopes - Google Patents
Ring laser gyroscopesInfo
- Publication number
- GB2021851A GB2021851A GB7913805A GB7913805A GB2021851A GB 2021851 A GB2021851 A GB 2021851A GB 7913805 A GB7913805 A GB 7913805A GB 7913805 A GB7913805 A GB 7913805A GB 2021851 A GB2021851 A GB 2021851A
- Authority
- GB
- United Kingdom
- Prior art keywords
- laser
- modes
- primary
- ring laser
- waves
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/58—Turn-sensitive devices without moving masses
- G01C19/64—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
- G01C19/66—Ring laser gyrometers
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Remote Sensing (AREA)
- Gyroscopes (AREA)
- Lasers (AREA)
- Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
- Lubricants (AREA)
- Photoreceptors In Electrophotography (AREA)
Abstract
A ring laser gyroscope has one or more weaker secondary laser modes, operating slightly above the laser threshold, coupling with stronger primary counterpropagating laser modes to produce a dithering effect which reduces or eliminates lock-in between the primary modes. Cavity length control circuitry 32 may be provided to detune the cavity length to allow two secondary opposing modes (40, 42) to be generated Figure 3 (not shown). Alternatively, an external laser beam source (74) may generate the secondary waves Figures (not shown). Finally, part of one of the primary waves may leave the ring laser path through a partially reflective mirror and be acted upon by an oscillating mirror (94) which doppler- shifts the frequency. This mode is reintroduced into the ring laser path to couple with the primary mode Figure 6 (not shown). <IMAGE>
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US90991978A | 1978-05-26 | 1978-05-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2021851A true GB2021851A (en) | 1979-12-05 |
| GB2021851B GB2021851B (en) | 1982-07-21 |
Family
ID=25428045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7913805A Expired GB2021851B (en) | 1978-05-26 | 1979-04-20 | Ring laser gyroscopes |
Country Status (18)
| Country | Link |
|---|---|
| JP (1) | JPS596520B2 (en) |
| AU (1) | AU521186B2 (en) |
| BE (1) | BE874859A (en) |
| BR (1) | BR7901915A (en) |
| CA (1) | CA1125895A (en) |
| CH (1) | CH645718A5 (en) |
| DE (1) | DE2920429A1 (en) |
| DK (1) | DK215579A (en) |
| ES (1) | ES479075A1 (en) |
| FR (1) | FR2426887A1 (en) |
| GB (1) | GB2021851B (en) |
| GR (1) | GR66808B (en) |
| IL (1) | IL56658A (en) |
| IT (1) | IT1115066B (en) |
| NL (1) | NL181953C (en) |
| NO (1) | NO152272C (en) |
| NZ (1) | NZ189487A (en) |
| SE (1) | SE448320B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2562342A1 (en) * | 1984-03-31 | 1985-10-04 | Deutsche Forsch Luft Raumfahrt | RING LASER, PARTICULARLY FOR RING LASER GYROSCOPE |
| GB2179199A (en) * | 1985-08-09 | 1987-02-25 | Litton Systems Inc | Control of ring laser gyro using preselected parametric model |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2120839A (en) * | 1982-05-19 | 1983-12-07 | Raytheon Co | Ring laser gyroscope |
| CN103674003B (en) * | 2012-09-07 | 2016-06-01 | 中国航空工业第六一八研究所 | A kind of electromagnetic drive type shaking laser gyroscope mechanism |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3697181A (en) * | 1967-03-14 | 1972-10-10 | Sperry Rand Corp | Ring laser having amplitude and phase controlled crossed-beam anti-locking feedback |
| US3741657A (en) * | 1971-03-03 | 1973-06-26 | Raytheon Co | Laser gyroscope |
| US3846025A (en) * | 1973-04-02 | 1974-11-05 | S Wilber | Frequency sensitive laser rotary motion sensor |
| US4152071A (en) * | 1976-08-02 | 1979-05-01 | Honeywell Inc. | Control apparatus |
| CA1085031A (en) * | 1976-11-08 | 1980-09-02 | Litton Systems, Inc. | Laser gyro with phased dithered mirrors |
-
1979
- 1979-01-19 CA CA319,945A patent/CA1125895A/en not_active Expired
- 1979-01-26 NZ NZ189487A patent/NZ189487A/en unknown
- 1979-02-02 GR GR58245A patent/GR66808B/el unknown
- 1979-02-06 AU AU43981/79A patent/AU521186B2/en not_active Ceased
- 1979-02-13 IL IL56658A patent/IL56658A/en unknown
- 1979-02-28 NL NLAANVRAGE7901581,A patent/NL181953C/en not_active IP Right Cessation
- 1979-03-14 FR FR7906502A patent/FR2426887A1/en active Granted
- 1979-03-15 BE BE0/194032A patent/BE874859A/en not_active IP Right Cessation
- 1979-03-20 IT IT48410/79A patent/IT1115066B/en active
- 1979-03-29 BR BR7901915A patent/BR7901915A/en unknown
- 1979-03-29 SE SE7902823A patent/SE448320B/en not_active IP Right Cessation
- 1979-03-30 ES ES479075A patent/ES479075A1/en not_active Expired
- 1979-04-16 JP JP54045512A patent/JPS596520B2/en not_active Expired
- 1979-04-20 GB GB7913805A patent/GB2021851B/en not_active Expired
- 1979-05-16 NO NO791638A patent/NO152272C/en unknown
- 1979-05-19 DE DE2920429A patent/DE2920429A1/en not_active Withdrawn
- 1979-05-25 DK DK215579A patent/DK215579A/en unknown
- 1979-05-25 CH CH492179A patent/CH645718A5/en not_active IP Right Cessation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2562342A1 (en) * | 1984-03-31 | 1985-10-04 | Deutsche Forsch Luft Raumfahrt | RING LASER, PARTICULARLY FOR RING LASER GYROSCOPE |
| GB2179199A (en) * | 1985-08-09 | 1987-02-25 | Litton Systems Inc | Control of ring laser gyro using preselected parametric model |
| US4783169A (en) * | 1985-08-09 | 1988-11-08 | Litton Systems, Inc. | Control of a ring laser gyro cavity according to a preselected model |
| GB2179199B (en) * | 1985-08-09 | 1990-01-10 | Litton Systems Inc | Control of ring laser gyro cavity according to a preselected model |
Also Published As
| Publication number | Publication date |
|---|---|
| SE7902823L (en) | 1979-11-27 |
| NO152272B (en) | 1985-05-20 |
| BR7901915A (en) | 1979-12-04 |
| CH645718A5 (en) | 1984-10-15 |
| FR2426887B1 (en) | 1984-06-22 |
| NO152272C (en) | 1985-08-28 |
| NL181953C (en) | 1987-12-01 |
| JPS54155794A (en) | 1979-12-08 |
| JPS596520B2 (en) | 1984-02-13 |
| BE874859A (en) | 1979-07-02 |
| GB2021851B (en) | 1982-07-21 |
| IT7948410A0 (en) | 1979-03-20 |
| IT1115066B (en) | 1986-02-03 |
| GR66808B (en) | 1981-04-30 |
| CA1125895A (en) | 1982-06-15 |
| SE448320B (en) | 1987-02-09 |
| NL181953B (en) | 1987-07-01 |
| AU521186B2 (en) | 1982-03-18 |
| DK215579A (en) | 1979-11-27 |
| NL7901581A (en) | 1979-11-28 |
| ES479075A1 (en) | 1979-06-01 |
| NO791638L (en) | 1979-11-27 |
| NZ189487A (en) | 1982-12-07 |
| IL56658A (en) | 1981-07-31 |
| FR2426887A1 (en) | 1979-12-21 |
| DE2920429A1 (en) | 1979-11-29 |
| AU4398179A (en) | 1979-11-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |