FR2441848A1 - Optical device to measure angular velocity of aircraft - uses measurement of frequency difference from light beams in coiled optical fibre - Google Patents
Optical device to measure angular velocity of aircraft - uses measurement of frequency difference from light beams in coiled optical fibreInfo
- Publication number
- FR2441848A1 FR2441848A1 FR7832317A FR7832317A FR2441848A1 FR 2441848 A1 FR2441848 A1 FR 2441848A1 FR 7832317 A FR7832317 A FR 7832317A FR 7832317 A FR7832317 A FR 7832317A FR 2441848 A1 FR2441848 A1 FR 2441848A1
- Authority
- FR
- France
- Prior art keywords
- angular velocity
- frequency difference
- laser
- aircraft
- light beams
- 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.)
- Withdrawn
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
- G01C19/72—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams with counter-rotating light beams in a passive ring, e.g. fibre laser gyrometers
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Gyroscopes (AREA)
Abstract
The angular velocity of an aircraft is measured to ensure stability and accurate navigation. A light guide acts as an annular resonant cavity for two light beams whose frequency difference is measured to determine the angular velocity. An optical fibre(1) is wound into a number of turns whose plane is parallel to that in which the velocity measurement is required. Mirrors (4, 5) form a closed loop via a luminous beam (6) from lasers. One laser (7a) transmits light via one mirror (4) into the fibre to enter a photodetector (9a). This affects a servo-system (10a) which controls a piezoelectric crystal(1 1 a) which controls the laser output. Light from a second laser (76) travels in the opposite direction and the frequency difference (delta F) between laser frequencies is measured via semi-reflecting wafers (12, 13). This signal is used in the navigation computer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7832317A FR2441848A1 (en) | 1978-11-15 | 1978-11-15 | Optical device to measure angular velocity of aircraft - uses measurement of frequency difference from light beams in coiled optical fibre |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7832317A FR2441848A1 (en) | 1978-11-15 | 1978-11-15 | Optical device to measure angular velocity of aircraft - uses measurement of frequency difference from light beams in coiled optical fibre |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2441848A1 true FR2441848A1 (en) | 1980-06-13 |
Family
ID=9214940
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7832317A Withdrawn FR2441848A1 (en) | 1978-11-15 | 1978-11-15 | Optical device to measure angular velocity of aircraft - uses measurement of frequency difference from light beams in coiled optical fibre |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2441848A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2446481A1 (en) * | 1979-01-15 | 1980-08-08 | Max Planck Gesellschaft | METHOD AND DEVICE FOR MEASURING ROTATION RATES BY THE SAGNAC EFFECT |
FR2454100A1 (en) * | 1979-04-09 | 1980-11-07 | Schnerb Pierre | Angular speed measurement using optical method - utilises frequency responses of two beams travelling in opposing directions |
-
1978
- 1978-11-15 FR FR7832317A patent/FR2441848A1/en not_active Withdrawn
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2446481A1 (en) * | 1979-01-15 | 1980-08-08 | Max Planck Gesellschaft | METHOD AND DEVICE FOR MEASURING ROTATION RATES BY THE SAGNAC EFFECT |
FR2454100A1 (en) * | 1979-04-09 | 1980-11-07 | Schnerb Pierre | Angular speed measurement using optical method - utilises frequency responses of two beams travelling in opposing directions |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4702600A (en) | Method and apparatus for measuring angular rate with a passive optical resonator | |
JP5096858B2 (en) | Optical resonator gyroscope and method for reducing resonance asymmetry error | |
Udd | Fiber-optic acoustic sensor based on the Sagnac interferometer | |
JPH0663727B2 (en) | Position detection device and method | |
US4492464A (en) | Apparatus and method for distance measurement by laser interferometry | |
JPH07181007A (en) | Measuring device wherein interferometer is applied | |
EP0401799A3 (en) | Length measuring apparatus | |
US3409370A (en) | Apparatus for measurement of lengths and of other physical parameters which are capable of altering an optical path length | |
EP0347215A2 (en) | Proximity sensor | |
US5668826A (en) | Electro-optical device comprising a controlled laser diode | |
EP0209721A1 (en) | Laser sensor | |
US4283144A (en) | Method of fiber interferometry zero fringe shift referencing using passive optical couplers | |
FR2441848A1 (en) | Optical device to measure angular velocity of aircraft - uses measurement of frequency difference from light beams in coiled optical fibre | |
JPH03269302A (en) | Absolute length measuring device | |
GB2154787A (en) | Laser stabilisation circuit | |
SU1420360A1 (en) | Method of measuring displacement of object | |
JPS61138191A (en) | Laser distance measuring method | |
US5463652A (en) | Combining optics for ring laser gyro | |
JPH02147908A (en) | Fiber-optic gyroscope | |
GB1076991A (en) | Measurement of linear distances | |
RU2089848C1 (en) | Laser deformation meter | |
SU938660A1 (en) | Device for remote measuring of distances | |
US4815852A (en) | Apparatus for measuring rotation by a combination of the Sagnac and Fizeau effects | |
SU911168A1 (en) | Optical vibrometer | |
RU2142117C1 (en) | Microresonator fiber-optical transmitter of angular displacements |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |