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WO2008138599A1 - Capteur de rotation actif - Google Patents

Capteur de rotation actif Download PDF

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Publication number
WO2008138599A1
WO2008138599A1 PCT/EP2008/003860 EP2008003860W WO2008138599A1 WO 2008138599 A1 WO2008138599 A1 WO 2008138599A1 EP 2008003860 W EP2008003860 W EP 2008003860W WO 2008138599 A1 WO2008138599 A1 WO 2008138599A1
Authority
WO
WIPO (PCT)
Prior art keywords
active
rotation sensor
fiber
sensor according
passive
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.)
Ceased
Application number
PCT/EP2008/003860
Other languages
German (de)
English (en)
Inventor
Walter Luhs
Fayez Jaber
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.)
MEOS AG
Original Assignee
MEOS AG
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 MEOS AG filed Critical MEOS AG
Priority to EP08758511A priority Critical patent/EP2149031A1/fr
Publication of WO2008138599A1 publication Critical patent/WO2008138599A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • G01C19/721—Details, e.g. optical or electronical details

Definitions

  • the invention relates to an active rotation sensor with a ring resonator for generating the laser light.
  • Such rotation sensors also referred to as laser gyros, are known and contain in tubes neon or comparable gases which are excited to produce the laser light which is guided inside the ring. These rotation sensors are complicated and expensive due to the gas filling.
  • Active rotation sensors of the type mentioned above are characterized in that the light source itself is an essential part of the gyroscope.
  • a ring laser has the property of generating laser light that passes through the top in both clockwise and inverse directions. This is of fundamental importance to the laser gyro, because it is precisely these two laser beams (modes) that ultimately change their properties differently when the gyro is rotated.
  • a fiber ring laser is known.
  • the mode coupling is used which consists essentially of an optical switch and an optical resonator tuned thereto.
  • the repetition rate of the optical switch determines the length of the resonator to be used. After activating the optical switch, it takes a certain time to close again. For this purpose, according to this prior art, 100 ns are required as Resonatorumlaufzeit. From the speed of the light in the fiber, the length of the entire optical resonator is about 20 m.
  • this known light source disadvantageously generates only pulsed multimodal radiation.
  • continuous and single-mode radiation is required for a laser gyro.
  • the rotation sensor is a fiber ring laser and that the active fiberglass material and passive fiberglass material are combined in a continuous manner.
  • an active rotation sensor which has only a comparatively low weight, even if glass fibers of considerable length must be used, which consist partly of active, partly passive material.
  • a rotation sensor is made of glass fibers easier to manufacture than a rotary sensor consisting of tubes, relatively inexpensive and has, as already mentioned, a low weight.
  • such a rotation sensor can achieve a long service life and is less susceptible to shock than a gas ring laser or rotation sensor, which is composed of gas tubes. Furthermore, there is no reason to fear that the gas important for the function escapes over time because the rotation sensor according to the invention requires no gas discharge tubes.
  • the passive fiber is connected to the two ends of the active fiber. It is expedient if the modes or frequencies emanating from the active glass fiber material in opposite sides or directions are superimposed in use.
  • At least one coupler or optical element is incorporated in the fiber strand to superpose the modes or frequencies emanating from the active glass fiber material in opposite directions or directions.
  • At least the fibrous strand made of passive glass fiber material can be wound into one or more coils. This makes it possible to accommodate a very large length of the passive glass fiber material in a small space.
  • the active fiber material On both sides of the active fiber material can be arranged, in particular mirror-symmetrical, in each case at least one coil of passive fiber material and connected to the active fiber material. This leads to a good symmetry of the rotation sensor.
  • a fiber-coupled diode laser with coupler For the supply of energy to the active glass fiber material, ie to the part of the rotation sensor which is formed by the active fiberglass material, a fiber-coupled diode laser with coupler can be provided. This is a proven way for such an energy supply.
  • a fiber filter for narrowing the emission spectrum of the active glass fiber material is provided in the region of the passive glass fiber material. According to the invention, it was experimentally surprisingly observed that a narrowband filter significantly improves the beat signal.
  • At least one polarization rotator can be arranged in the course of the passive fiberglass material. It can thus be ensured that the laser light in each case enters the active glass fiber material with the same polarization, from which it also originates.
  • the length of the active glass fiber is about five meters to about ten meters, preferably about six meters to about eight meters, in particular about seven meters.
  • the length of the passive glass fiber may be on the order of about fifty meters or hundred meters or two hundred meters or four hundred meters or possibly more or intermediate values of these lengths be.
  • the combination of active and passive glass fibers of the indicated lengths results in an effective rotation sensor, which may advantageously be made of fiberglass material, so that no gas tubes are required.
  • an active light source is allowed to emit only a single mode to obtain a unique beat frequency due to the gyroscope rotation.
  • a fiber ring laser is selected as the laser, it requires at least a few meters of this active material to generate laser radiation. Furthermore, the gain bandwidth compared to the known helium neon laser (0.002 nm), for example erbium doped fiber laser (about 60 nm) is much larger. Thus one has a resonator several meters long and an enormous high amplification bandwidth. The modes are therefore so close in the present invention that no optical filters or other mechanisms are known which allow one-mode and continuous radiation to be generated with a fiber laser or fiber ring laser.
  • the mode spacing of the optical resonator is calculated in the case of a fiber ring laser with a geometric length of 200 m which is particularly preferred according to the invention to:
  • the active glass fiber and the passive glass fiber may be fused together at their joints.
  • the production of the rotation sensor is very simple.
  • the active fiber may be wound to a space-saving coil having at least one or more windings.
  • a space-saving coil having at least one or more windings.
  • a rotation sensor which is a fiber ring laser, wherein the active fiberglass material is combined in a surprising manner with passive fiberglass material, so that a functional active rotation sensor is formed.
  • the single figure shows a schematic representation of an active rotation sensor according to the invention.
  • An active rotation sensor denoted overall by 100 is designed as a fiber ring laser in which active fiberglass material 3 and passive fiberglass material 2 are combined in a continuous manner.
  • the active fiberglass material 3 drawn as a broken line, extends in opposite sides or directions the passive fiberglass material 2 in order to form a ring resonator as a whole.
  • the modes or frequencies emanating from the active optical fiber 3 in opposite sides or directions can be superimposed in use be.
  • optical elements namely fiber concentrators 9 and 10 and a beam splitter 11 are incorporated in the fiber strand, in the exemplary embodiment in the course of the passive glass fiber material, in one whole 7 with a designated detection unit, which also detects a mirror 12 and a photodetector 13.
  • the above-mentioned superposition of the two modes is arranged in the region of the detection unit 7 at a position which is approximately opposite to the point of generation of the laser light on the entire fiber ring, it being ensured that the distances from the ends 3 a of the active fiber material 3 to the detection point or detection unit 7 are the same length, these distances are also measured over the respective turns of the sensor coils 5 and 6.
  • a fiber-coupled diode laser 1 is provided with coupler 1a, as it is schematically but clearly recognizable in the drawing.
  • coupler 1a one of the passive glass fibers of the coupler 1a with the active glass fiber 3rd be connected, as the drawing also indicates.
  • a polarization rotator 8 is arranged so that the laser light after one revolution again with the same polarization in the area of the active fiber material 3 and enter a changed polarization on its way can be reversed.
  • the length of the active glass fiber 3 may be, for example, between five meters and ten meters, preferably about seven meters.
  • the length of the passive glass fiber 2 may, for example, be on the order of two hundred meters, each of the coils 5 and 6 in unwound form having a length of about one hundred meters.
  • the active glass fiber 3 and the passive glass fiber 2 may be fused together in a known manner.
  • the active fiber 3 could be wound depending on the available space to a space-saving coil having at least one or more turns.
  • the active rotation sensor 100 which may also be referred to as a gyroscope for measuring rotational movements, has a ring resonator for generating the laser light and is a
  • Fiber ring laser in which the active fiberglass material 3 and passive fiberglass material 2 continue each other and form a ring combined are combined.
  • the length fraction of the passive glass fiber material 2, which connects the two ends of the active glass fiber material 3 is considerably larger than that of this active glass fiber material 3.

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)
  • Lasers (AREA)

Abstract

Capteur de rotation actif (100), pouvant aussi être désigné par le terme de gyroscope, pour la mesure de mouvements de rotation, qui comporte un résonateur annulaire destiné à produire de la lumière laser et qui est un laser à fibre en anneau dans lequel la fibre optique active (3) et la fibre optique passive (2) se prolongent l'une par l'autre et sont réunies pour former un anneau. Dans ce contexte, la longueur de la fibre optique passive (2) qui relie les deux extrémités de la fibre optique active (3) est beaucoup plus importante que celle de la fibre optique active (3).
PCT/EP2008/003860 2007-05-14 2008-05-14 Capteur de rotation actif Ceased WO2008138599A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08758511A EP2149031A1 (fr) 2007-05-14 2008-05-14 Capteur de rotation actif

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007022561.1 2007-05-14
DE200710022561 DE102007022561B4 (de) 2007-05-14 2007-05-14 Aktiver Rotationssensor

Publications (1)

Publication Number Publication Date
WO2008138599A1 true WO2008138599A1 (fr) 2008-11-20

Family

ID=39720067

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/003860 Ceased WO2008138599A1 (fr) 2007-05-14 2008-05-14 Capteur de rotation actif

Country Status (3)

Country Link
EP (1) EP2149031A1 (fr)
DE (1) DE102007022561B4 (fr)
WO (1) WO2008138599A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5132976A (en) * 1991-05-28 1992-07-21 At&T Bell Laboratories Electrically tunable fiber ring laser
EP0670617A1 (fr) * 1994-03-01 1995-09-06 Hewlett-Packard Company Laser en anneau
WO2005022709A1 (fr) * 2003-08-27 2005-03-10 Forskningscenter Risø Source laser a balayage de frequence continu
WO2005043700A2 (fr) * 2003-10-30 2005-05-12 Corning Incorporated Laser et amplificateur a fibre optique de polarisation unique

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0248648B1 (fr) * 1986-06-06 1992-01-15 The Board Of Trustees Of The Leland Stanford Junior University Gyroscope avec fibre optique à effet Raman utilisant une recirculation du signal
US5701319A (en) * 1995-10-20 1997-12-23 Imra America, Inc. Method and apparatus for generating ultrashort pulses with adjustable repetition rates from passively modelocked fiber lasers
EP0917651B1 (fr) * 1996-08-07 2001-10-31 WOLTER, Klaus Dispositif de detection de valeurs mecaniques, telles que les angles et les vitesses de rotation, les vitesses ou les accelerations angulaires
US5926275A (en) * 1997-06-19 1999-07-20 Honeywell Inc. Vibration error reduction servo for a fiber optic gyroscope
DE19748909C1 (de) * 1997-11-05 1999-04-22 Litef Gmbh Verfahren zur Vermeidung von Nullpunktfehlern in einem faseroptischen Sagnac-Interferometer
US6144788A (en) * 1998-06-30 2000-11-07 Honeywell, Inc. High stability fiber light source
JP4194763B2 (ja) * 1998-10-31 2008-12-10 ザ・ボード・オブ・トラスティーズ・オブ・ザ・レランド・スタンフォード・ジュニア・ユニバーシティ 偏光および波長の安定した超蛍光ソース

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5132976A (en) * 1991-05-28 1992-07-21 At&T Bell Laboratories Electrically tunable fiber ring laser
EP0670617A1 (fr) * 1994-03-01 1995-09-06 Hewlett-Packard Company Laser en anneau
WO2005022709A1 (fr) * 2003-08-27 2005-03-10 Forskningscenter Risø Source laser a balayage de frequence continu
WO2005043700A2 (fr) * 2003-10-30 2005-05-12 Corning Incorporated Laser et amplificateur a fibre optique de polarisation unique

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CHIN-YI LIAW ET AL: "Theory of an Amplified Closed-Sagnac-Loop Interferometric Fiber-Optic Gyroscope", IEEE JOURNAL OF QUANTUM ELECTRONICS, IEEE SERVICE CENTER, PISCATAWAY, NJ, USA, vol. 35, no. 12, 1 December 1999 (1999-12-01), XP011052343, ISSN: 0018-9197 *
KRINGLEBOTN J T: "AMPLIFIED FIBER RING RESONATOR GYRO", IEEE PHOTONICS TECHNOLOGY LETTERS, IEEE SERVICE CENTER, PISCATAWAY, NJ, US, vol. 4, no. 10, 1 October 1992 (1992-10-01), pages 1180 - 1183, XP000316552, ISSN: 1041-1135 *

Also Published As

Publication number Publication date
DE102007022561B4 (de) 2010-09-16
DE102007022561A1 (de) 2008-11-27
EP2149031A1 (fr) 2010-02-03

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