WO2000070307A3 - A sensor and a method for determining the direction and the amplitude of a bend - Google Patents

A sensor and a method for determining the direction and the amplitude of a bend Download PDF

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Publication number
WO2000070307A3
WO2000070307A3 PCT/DK2000/000258 DK0000258W WO0070307A3 WO 2000070307 A3 WO2000070307 A3 WO 2000070307A3 DK 0000258 W DK0000258 W DK 0000258W WO 0070307 A3 WO0070307 A3 WO 0070307A3
Authority
WO
WIPO (PCT)
Prior art keywords
fibre
bend
lpg
amplitude
present
Prior art date
Application number
PCT/DK2000/000258
Other languages
French (fr)
Other versions
WO2000070307A2 (en
Inventor
Joerg Huebner
Martin Kristensen
Jacob Rathje
Original Assignee
Joerg Huebner
Martin Kristensen
Jacob Rathje
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 Joerg Huebner, Martin Kristensen, Jacob Rathje filed Critical Joerg Huebner
Priority to AU43940/00A priority Critical patent/AU4394000A/en
Publication of WO2000070307A2 publication Critical patent/WO2000070307A2/en
Publication of WO2000070307A3 publication Critical patent/WO2000070307A3/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G01D5/35338—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using other arrangements than interferometer arrangements
    • G01D5/35341—Sensor working in transmission
    • G01D5/35345—Sensor working in transmission using Amplitude variations to detect the measured quantity
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
    • G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
    • G02B6/0208—Refractive index modulation gratings, e.g. Bragg gratings characterised by their structure, wavelength response
    • G02B6/02085—Refractive index modulation gratings, e.g. Bragg gratings characterised by their structure, wavelength response characterised by the grating profile, e.g. chirped, apodised, tilted, helical
    • G02B6/02095—Long period gratings, i.e. transmission gratings coupling light between core and cladding modes
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
    • G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
    • G02B6/02123—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating
    • G02B6/02142—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating based on illuminating or irradiating an amplitude mask, i.e. a mask having a repetitive intensity modulating pattern
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
    • G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
    • G02B6/02195—Refractive index modulation gratings, e.g. Bragg gratings characterised by means for tuning the grating
    • G02B6/022—Refractive index modulation gratings, e.g. Bragg gratings characterised by means for tuning the grating using mechanical stress, e.g. tuning by compression or elongation, special geometrical shapes such as "dog-bone" or taper

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Transform (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

The present invention relates to an optical based bending sensor. In particular, the present invention relates to a fibre-based bending sensor for the determination of the direction and the amplitude of a bend. The present invention further relates to fibre-based bending sensors using long-period fibre gratings (LPG), in which the intrinsic properties of the fibre and the bend sensitivity of LPG is utilised. In a preferred embodiment, the connection between the Core Concentricity Error (CCE) of the fibre and the LPG in the asymmetric bend behaviour results in coupling resonance between the core and the cladding modes. Thereby a relative splitting of transmission peaks in the spectrum of the LPG is induced, which is used to determine the bending amplitude and direction.
PCT/DK2000/000258 1999-05-12 2000-05-12 A sensor and a method for determining the direction and the amplitude of a bend WO2000070307A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU43940/00A AU4394000A (en) 1999-05-12 2000-05-12 A sensor and a method for determining the direction and the amplitude of a bend

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DKPA199900652 1999-05-12
DKPA199900652 1999-05-12
DKPA199901341 1999-09-21
DKPA199901341 1999-09-21

Publications (2)

Publication Number Publication Date
WO2000070307A2 WO2000070307A2 (en) 2000-11-23
WO2000070307A3 true WO2000070307A3 (en) 2001-03-08

Family

ID=26064394

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK2000/000258 WO2000070307A2 (en) 1999-05-12 2000-05-12 A sensor and a method for determining the direction and the amplitude of a bend

Country Status (2)

Country Link
AU (1) AU4394000A (en)
WO (1) WO2000070307A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040073461A (en) * 2001-12-08 2004-08-19 우벤 알로이즈 Rotor Blade of a Wind Power Installation, Comprising a Warning Light
EP1384437B1 (en) * 2002-07-23 2006-12-27 Aston University Optical waveguide based surface profiling apparatus
DE102006046693A1 (en) * 2006-09-29 2008-04-03 Siemens Ag Fiber optic sensor device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2190211A (en) * 1986-05-08 1987-11-11 Stc Plc Adjustable single-mode optical-fibre attenuator
US5641956A (en) * 1996-02-02 1997-06-24 F&S, Inc. Optical waveguide sensor arrangement having guided modes-non guided modes grating coupler
US6058226A (en) * 1997-10-24 2000-05-02 D-Star Technologies Llc Optical fiber sensors, tunable filters and modulators using long-period gratings

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2190211A (en) * 1986-05-08 1987-11-11 Stc Plc Adjustable single-mode optical-fibre attenuator
US5641956A (en) * 1996-02-02 1997-06-24 F&S, Inc. Optical waveguide sensor arrangement having guided modes-non guided modes grating coupler
US6058226A (en) * 1997-10-24 2000-05-02 D-Star Technologies Llc Optical fiber sensors, tunable filters and modulators using long-period gratings

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATRICK H J ET AL: "Long period fibre gratings for structural bend sensing", ELECTRONIC LETTERS, vol. 34, no. 18, 3 September 1998 (1998-09-03), pages 1773 - 1775, XP002901223, ISSN: 0013-5194 *

Also Published As

Publication number Publication date
AU4394000A (en) 2000-12-05
WO2000070307A2 (en) 2000-11-23

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