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 fibre

Info

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Withdrawn
Application number
FR7832317A
Other languages
French (fr)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to FR7832317A priority Critical patent/FR2441848A1/en
Publication of FR2441848A1 publication Critical patent/FR2441848A1/en
Withdrawn legal-status Critical Current

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

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.
FR7832317A 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 Withdrawn FR2441848A1 (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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

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Legal Events

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