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WO2009067994A1 - Capteur de proximité optique pour la détection d'un matériau magnétique - Google Patents

Capteur de proximité optique pour la détection d'un matériau magnétique Download PDF

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Publication number
WO2009067994A1
WO2009067994A1 PCT/DE2008/001918 DE2008001918W WO2009067994A1 WO 2009067994 A1 WO2009067994 A1 WO 2009067994A1 DE 2008001918 W DE2008001918 W DE 2008001918W WO 2009067994 A1 WO2009067994 A1 WO 2009067994A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical
proximity sensor
optical radiation
light source
magnetic material
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/DE2008/001918
Other languages
German (de)
English (en)
Inventor
Peter Paul Deimel
Thomas Pistner
Andreas Prücklmeier
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.)
Airbus Defence and Space GmbH
Original Assignee
EADS Deutschland GmbH
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 EADS Deutschland GmbH filed Critical EADS Deutschland GmbH
Publication of WO2009067994A1 publication Critical patent/WO2009067994A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/032—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect
    • G01R33/0322—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect using the Faraday or Voigt effect
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
    • G01R15/245—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect
    • G01R15/246—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect based on the Faraday, i.e. linear magneto-optic, effect

Definitions

  • Optical proximity sensor for the detection of a magnetic material
  • the invention relates to an optical proximity sensor for the detection of a magnetic material according to the preamble of claim 1.
  • FIG. 1 shows the schematic structure of an optical proximity sensor for the detection of a magnetic material according to the prior art.
  • the distance to the magnetic material 8 (permanent magnetic material) is determined by the measurement of the magnetic field 10.
  • unpolarized light is fed to the sensor head 9 via a multimode fiber or monomode fiber 3.
  • the light is collimated with a lens 4 and polarized with a linear polarizing filter 5.
  • the polarized light passes through a Faraday material 6 (eg BIG crystal) which under the action of a magnetic field 10 of the magnetic material 8 rotates the polarization direction of the light.
  • the light is then reflected by a mirror 7 and the polarization is further rotated when re-passing the Faraday material 6.
  • a Faraday material 6 eg BIG crystal
  • the polarizing filter 5 Due to the rotated polarization, the polarizing filter 5 only transmits part of the reflected light, depending on the degree of polarization rotation. Here, the transmission of the polarization filter follows a cosine function as shown in FIG. Since the rotation of the polarization direction of the light by a magnetic field acting on the Faraday material is low, the change in the transmission of the polarizing filter 5 is also small.
  • the lens 4 then couples the light back into the fiber 3, which guides the light attenuated as a function of the magnetic field strength back to an evaluation unit. The intensity of the returned light provides information about the distance of the magnetic material to the sensor head.
  • An optical proximity sensor of this type is known from US 6498 654.
  • the object of the invention is an optical proximity sensor for the Detection of a magnetic material with improved sensitivity for magnetic materials to create.
  • optical proximity sensor for the detection of a magnetic material having the features of claim 1.
  • the invention provides an optical proximity sensor for the detection of a magnetic material comprising a light source emitting an optical radiation and an optical detector for detecting the optical radiation emitted by the light source and containing information about the presence of magnetic material and a polarizing filter and a Faraday material successively disposed in the path of the optical radiation emitted by the light source, and a mirror which reflects the optical radiation exiting from the Faraday material through this and the polarizing filter back to the optical detector, wherein the Polarization direction of the optical radiation in the Faraday material is rotated by nearby magnetic material and a corresponding change in the intensity of the polarization filter transmitted by the optical radiation is detected at the detector.
  • a ⁇ / 4-plate is arranged between the Faraday material and the mirror, which causes a rotation of the polarization direction of the Faraday material back reflected optical radiation by 90 °.
  • the light source is followed by a multimode optical / monomode fiber, via which the optical radiation is guided from the light source to the polarization filter.
  • a collimator lens is arranged between the optical multimode fiber / monomode fiber and the polarization filter.
  • the polarization filter, the Faraday material, the ⁇ / 4 plate and the mirror are combined in a sensor head, which is connected via the optical multimode fiber / monomode fiber with an evaluation unit, in which the light source and the optical detector are combined, the optical radiation being conducted from the light source via the multimode fiber / monomode fiber to the sensor head and from this via the multimode fiber back to the evaluation unit.
  • the mirror can be formed by a separate element.
  • the mirror may be formed by a reflective end face on the ⁇ / 4 plate.
  • the proximity sensor is provided as a position indicating switch for doors or gates, which contain or consist of a magnetic material.
  • the proximity sensor can be advantageously provided as a position indicating switch for doors or gates of a vehicle, in particular an aircraft.
  • Fig. 1 is a schematic representation of the structure of an optical proximity sensor for the detection of a magnetic material according to the prior art
  • Fig. 2 is a diagram showing the transmission of the polarizing filter as a function of the rotated polarization direction of the light following a cosine function, as is the case in the prior art proximity sensor shown in Fig. 1;
  • FIG. 3 is a schematic representation of the structure of an optical proximity sensor for the detection of a magnetic material according to an embodiment of the invention.
  • Fig. 4 is a diagram showing the transmission of the polarizing filter in
  • FIG. 5 is a graph showing the percentage change in the transmission of the polarizing filter as a function of the direction of polarization of the light for the proximity sensor according to the embodiment of the invention shown in FIG. 3 compared to the prior art proximity sensor shown in FIG.
  • FIG. 3 shows the schematic structure of an optical proximity sensor for the detection of a magnetic material according to an exemplary embodiment of the invention.
  • the distance to the magnetic material 8 (Permanent magnetic material) is determined by the measurement of the magnetic field 10.
  • unpolarized light is fed to the sensor head 9 via a multimode fiber / monomode fiber 3.
  • the light is collimated with a lens 4 and polarized with a linear polarizing filter 5.
  • the polarized light passes through a Faraday material 6 (eg BIG crystal) which under the action of a magnetic field 10 of the magnetic material 8 rotates the polarization direction of the light.
  • the light is then reflected by a mirror 7 and the polarization is further rotated when re-passing the Faraday material 6.
  • a Faraday material 6 eg BIG crystal
  • the polarizing filter 5 allows only a part of the reflected light to pass, depending on the polarization being rotated.
  • the lens 4 then couples the light back into the fiber 3, which guides the light attenuated as a function of the magnetic field strength back to an evaluation unit.
  • the intensity of the returned light provides information about the distance of the magnetic material to the sensor head.
  • FIG. 5 is a graph showing the percentage change in the transmission of the polarizing filter as a function of the rotation of the polarization direction of the light for the proximity sensor shown in FIG. 3 according to the embodiment of the invention (upper curve) compared to the proximity sensor shown in FIG State of the art (lower curve).
  • the mirror 7 may be a separate element or realized by applying suitable materials to the end face of the ⁇ / 4 plate 11.
  • the ⁇ / 4 plate 11 may also be arranged between the polarizing filter 5 and the Faraday material 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Magnetic Variables (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

L'invention concerne un capteur de proximité optique pour la détection d'un matériau magnétique (8), comportant une source de lumière émettant un rayonnement optique, un détecteur optique détectant le rayonnement optique émis par la source de lumière, contenant une information concernant la présence de matériau magnétique, un filtre de polarisation (5) et un matériau de Faraday (6) disposés les uns derrière les autres dans la trajectoire du rayonnement optique émis par la source de lumière, et un miroir (7) réfléchissant le rayonnement optique quittant le matériau de Faraday, à travers le matériau de Faraday et le filtre de polarisation, vers le détecteur optique, la direction de polarisation du rayonnement optique dans le matériau de Faraday (6) étant déviée par du matériau magnétique (8) présent à proximité, et une variation correspondante de l'intensité du rayonnement optique filtré par le filtre de polarisation étant détectée sur le détecteur. Une plaque ?/4 (11) est disposée entre le matériau de Faraday (6) et le miroir (7), cette plaque produisant une rotation de 90° de la direction de polarisation du rayonnement optique réfléchi vers le matériau de Faraday (6). La sensibilité du capteur est notamment augmentée ainsi en cas de champs magnétiques faibles.
PCT/DE2008/001918 2007-11-29 2008-11-20 Capteur de proximité optique pour la détection d'un matériau magnétique Ceased WO2009067994A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007057897.2 2007-11-29
DE200710057897 DE102007057897B4 (de) 2007-11-29 2007-11-29 Positionsanzeigender Näherungssensor

Publications (1)

Publication Number Publication Date
WO2009067994A1 true WO2009067994A1 (fr) 2009-06-04

Family

ID=40478496

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2008/001918 Ceased WO2009067994A1 (fr) 2007-11-29 2008-11-20 Capteur de proximité optique pour la détection d'un matériau magnétique

Country Status (2)

Country Link
DE (1) DE102007057897B4 (fr)
WO (1) WO2009067994A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014134713A1 (fr) * 2013-03-08 2014-09-12 Messier-Dowty Inc. Capteur de proximité

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4516073A (en) * 1981-12-04 1985-05-07 Thomson-Csf Magnetometer probe using a thin-film magnetic material as a magneto-optic sensor
US5149962A (en) * 1991-06-03 1992-09-22 Simmonds Precision Products, Inc. Proximity detector using faraday effect and bidirectional transmission
US6498654B1 (en) * 1999-06-11 2002-12-24 Harco Laboratories, Inc. Optical proximity detector

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4902888A (en) * 1987-12-15 1990-02-20 Brother Kogyo Kabushiki Kaisha Optical fiber sensor
DK108691D0 (da) * 1991-06-07 1991-06-07 Allan Goettsche Maaling af induceret dobbeltbrydning
US5644397A (en) * 1994-10-07 1997-07-01 The Texas A&M University System Fiber optic interferometric circuit and magnetic field sensor
JP3258520B2 (ja) * 1994-12-12 2002-02-18 松下電器産業株式会社 光ファイバセンサ及びその製造方法
US5696858A (en) * 1996-08-01 1997-12-09 The Texas A&M University System Fiber Optics apparatus and method for accurate current sensing
DE19801632C2 (de) * 1997-10-24 2003-05-08 Pepperl & Fuchs Reflexlichtschranke, insbesondere zur Erkennung transparenter, polarisierender Materialien, sowie ein Verfahren zur Verbesserung der Störsicherheit von Reflexlichtschranken
DE102005043322B4 (de) * 2005-09-12 2015-03-19 AREVA T&D Inc. Corp. Faseroptischer Stromsensor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4516073A (en) * 1981-12-04 1985-05-07 Thomson-Csf Magnetometer probe using a thin-film magnetic material as a magneto-optic sensor
US5149962A (en) * 1991-06-03 1992-09-22 Simmonds Precision Products, Inc. Proximity detector using faraday effect and bidirectional transmission
US6498654B1 (en) * 1999-06-11 2002-12-24 Harco Laboratories, Inc. Optical proximity detector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014134713A1 (fr) * 2013-03-08 2014-09-12 Messier-Dowty Inc. Capteur de proximité
US10069494B2 (en) 2013-03-08 2018-09-04 Safran Landing Systems Canada Inc./Safran Systemes D'atterrissage Canada Inc. Proximity sensor

Also Published As

Publication number Publication date
DE102007057897B4 (de) 2010-09-02
DE102007057897A1 (de) 2009-06-10

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