WO2006017974A1 - Tete de capteur de deformations a fibre ou a reseau de fibres et son systeme de mesure de deformations - Google Patents

Tete de capteur de deformations a fibre ou a reseau de fibres et son systeme de mesure de deformations Download PDF

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Publication number
WO2006017974A1
WO2006017974A1 PCT/CN2005/001106 CN2005001106W WO2006017974A1 WO 2006017974 A1 WO2006017974 A1 WO 2006017974A1 CN 2005001106 W CN2005001106 W CN 2005001106W WO 2006017974 A1 WO2006017974 A1 WO 2006017974A1
Authority
WO
WIPO (PCT)
Prior art keywords
fiber
sensing head
strain
grating
fold
Prior art date
Application number
PCT/CN2005/001106
Other languages
English (en)
Chinese (zh)
Inventor
Haitao Liu
Zhihong Xu
Siyu Zhang
Original Assignee
Beijing Jiarun Fiber Sensing Technology Inc
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 Beijing Jiarun Fiber Sensing Technology Inc filed Critical Beijing Jiarun Fiber Sensing Technology Inc
Publication of WO2006017974A1 publication Critical patent/WO2006017974A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/08—Testing mechanical properties
    • G01M11/083—Testing mechanical properties by using an optical fiber in contact with the device under test [DUT]
    • G01M11/085—Testing mechanical properties by using an optical fiber in contact with the device under test [DUT] the optical fiber being on or near the surface of the DUT
    • 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
    • G01D5/35306—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 an interferometer arrangement
    • G01D5/35309—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 an interferometer arrangement using multiple waves interferometer
    • G01D5/35316—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 an interferometer arrangement using multiple waves interferometer using a Bragg gratings

Definitions

  • the present invention relates to the field of sensing technology, and more particularly to a fiber grating or fiber strain sensing head, and a strain measuring system comprising the fiber grating or fiber strain sensing head.
  • the traditional strain gauges are mainly based on piezoelectric or resistive, vibration and other principles, are susceptible to electromagnetic interference, and have relatively serious zero drift, which is difficult to achieve distributed measurement.
  • fiber-optic sensors or fiber-optic strain sensors have been greatly developed.
  • the fiber-optic sensor has the following advantages: 1. It is free from electromagnetic interference; 2. The structure is small, and it is easy to be buried in the object to be measured; 3. The stability is good. Therefore, in the application of structural engineering, the replacement of traditional resistance strain sensors by fiber-optic sensors is a trend in technology development.
  • the prior art fiber-optic sensor or strain measurement system has limitations in the design structure of the fiber strain sensing head, such as a patch-type fiber strain sensing head, and the like in practical use in some complicated occasions. Technical defects inconvenience in installation.
  • the prior art fiber strain sensing head generally includes upper and lower crosspieces, and a bracket reflecting the deformation of the force in the middle, and the sensitive portion of the bracket is pasted with an optical fiber. Summary of the invention
  • the present invention is directed to the above-mentioned defects existing in the prior art, and provides a design structure that is reasonable and convenient. Installed, fiber grating or fiber strain sensing heads for a wide range of complex structural strain monitoring.
  • the present invention also provides a strain measurement system including the fiber grating or fiber strain sensing head.
  • a fiber grating or fiber strain sensing head comprising a bracket, and an optical fiber or a fiber grating, wherein: the bracket is a bent structure with a horizontal fold and a vertical fold, and the fiber grating or optical fiber is pasted in the On or on the outer surface of the vertical fold.
  • the end of the bracket is provided with a crosspiece.
  • a mounting screw hole is disposed on the crosspiece.
  • the bent structure has a convex shape, i.e., has an upper cross-fold and a lower cross-fold, and a vertical fold that aligns the two cross-folds.
  • the upper cross-fold and the lower cross-fold are each substantially parallel to the crosspiece, and the vertical fold is substantially perpendicular to the cross-fold.
  • a housing is attached to the bracket.
  • One kind of strain measurement system comprising a sensor head, wherein: the fiber optic sensor head above ⁇ : register or fiber strain sensor head.
  • the fiber grating or the fiber strain sensing head of the present invention is attached to the outer surface of the vertical folded portion or the inner surface of the vertical folded portion by the optical fiber or the optical fiber grating, it is beneficial to truly reflect the engineering structure or the stress state of the measured object. Or the corresponding amount of strain displacement, so as to achieve accurate measurement or accurate monitoring.
  • the bent structure is convex, that is, it has an upper cross-section and a lower cross-fold, and a vertical fold that connects the two cross-folds, so that the optical fiber or the fiber grating is pasted on the
  • the inner or outer surface of the vertical fold is simple and convenient 5 and the convex shape facilitates the design of the strain model.
  • the vertical fold is substantially perpendicular to the cross-fold, which is advantageous for design and mass production to ensure stable and reliable quality.
  • the crosspiece is provided with a mounting screw hole, it is possible to weld the two ends of the cross member to the surface of the steel structure, or to the steel structure or the concrete surface by screws through the mounting holes on the lateral end.
  • the strain measuring system of the present invention adopts the above fiber grating or fiber strain sensing head, the strain measuring system can also obtain the corresponding beneficial technical effects as described above.
  • FIG. 1 is a schematic structural view of a fiber grating or fiber strain sensing head according to the present invention.
  • FIG. 2 is a schematic structural view of a second embodiment of a fiber grating or fiber strain sensing head.
  • FIG 3 is a schematic structural view of a third embodiment of a fiber grating or fiber strain sensing head.
  • FIG. 4 is a schematic structural view of a fourth embodiment of a fiber grating or fiber strain sensing head.
  • FIG. 5 is a schematic structural view of a fifth embodiment of a fiber grating or fiber strain sensing head.
  • FIG. 6 is a schematic structural view of a sixth embodiment of a fiber grating or fiber strain sensing head.
  • FIG. 7 is a schematic structural view of a seventh embodiment of a fiber grating or fiber strain sensing head.
  • FIG. 8 is a schematic structural view of an eighth embodiment of a fiber grating or fiber strain sensing head.
  • markers in the figure are listed below: 1-bracket; 2-fiber; 3-upper rail; ⁇ -lower rail; 5-mounting screw hole; 6-bend-shaped structure; 7-upper cross-section; 8-lower cross-section; Folded portion; 10-shell; 11-folded outer surface; 12-vertical inner surface; 13-fiber or fiber grating. detailed description
  • the technical idea of the present invention is to provide a sensing head for strain sensing using an optical fiber or a fiber grating.
  • the sensing head basically has the following features: 1. There is a convex bracket, and one side of the bracket is adhered to an optical fiber or a fiber grating. 2. Both ends of the bracket can be installed or welded to the measured object to monitor changes in stress and displacement. 3. The outer casing is used to protect and guide the sliding rods at both ends.
  • this sensor head works as follows:
  • the fiber or fiber grating is adhered to the central convex position of the convex bracket, and both ends are fixed on the object to be measured.
  • the purpose of the crosspiece at both ends of the sensing head is to embed the sensor head in concrete or other forms of the building. When the object is deformed for some reason, pull the crosspiece to cause the sensor head to change. You can also weld the two ends to the surface of the steel structure, or through the mounting hole on the horizontal end. The screws are mounted on steel or concrete surfaces. After the fiber or fiber grating is pulled, the wavelength of the reflection changes accordingly. By monitoring the change of the reflection wavelength, the corresponding strain or displacement of the measured object can be inferred.
  • the optical fiber strain sensing head of the present invention comprises an upper rail 3, a lower rail 4 and a bracket 1 between the two rails, and an optical fiber 13 which is a bent structure 6 , fiber 13 It is adhered to the surface 12 of the vertical fold 5 of the bent structure 6, and it is obviously also possible to stick it on the outer surface 11 of the vertical fold.
  • the bent structure eliminates the situation of stress instability 3 by attaching a fiber grating or an optical fiber to the outer surface of the vertical folded portion or the inner surface of the vertical folded portion of the bent structure In the above, it is beneficial to truly reflect the engineering structure or the stress state of the measured object or the corresponding strain displacement amount 5 to achieve accurate measurement or accurate monitoring.
  • a housing 10 is provided on the periphery of the bracket 1, and the housing 10 serves as a protection.
  • FIG. 2 shows the relationship between the optical fiber 13 and strain gauge sensor head main body 3
  • grating or optical fiber may be attached to the vertical surface of the folded portion 12, may be attached to the outer surface of the vertical portion 11 folded.
  • the fiber grating or fiber is adhered to the surface of the sensing head by an adhesive.
  • FIG. 3 shows the shape configuration of the sensing head main body, including an upper crosspiece 3, a lower crosspiece 4, and a bracket 1 interposed between the two crosspieces.
  • the bracket 1 is a bent structure. 6 , in a convex shape, that is, having an upper cross-folded portion 7 and a lower cross-folded portion 8 , and a vertical folded portion 9 that is connected to the two horizontally-folded portions, so that the fiber grating or the optical fiber is pasted on the vertical fold
  • the surface of the portion 9 is convenient, and the convex shape facilitates the design of the strain model.
  • the upper cross-fold and the lower cross-fold are both substantially parallel to the crosspiece, and the vertical fold is substantially perpendicular to the cross-fold, which is advantageous for design and mass production, thereby ensuring stable and reliable quality.
  • Figure 4 shows a variation of the sensing head, with a thin waist at the ends of the rods to form a deformed area.
  • Adjusting the size of H, L, m, a can change the ratio of the induced grating to the deformation of the measured object. example.
  • adjusting the size of HL, m a can also change the ratio of the induced grating to the deformation of the measured object, which is beneficial for accurate measurement.
  • the purpose of the crosspiece at both ends of the sensor head is to pull the crosspiece when the sensor head is embedded in concrete or other forms of building, and when the object is deformed for some reason,
  • the sensor head causes a variant, and it is also possible to weld the two ends of the crosspiece to the surface of the steel structure or to the steel structure or the concrete surface by screws through the mounting holes in the crosspiece.
  • Figure 5 shows another variation of the sensing head having only one cross-fold and one vertical fold.
  • Figure 6, Figure 7, and Figure 8 show the rectangular frame structure, H-frame structure, and biconvex arc structure of the sensor head, respectively. These structural designs enable the fiber grating or fiber strain sensing head of the present invention to be used in a variety of applications.
  • the part can be applied as a component to an integral sensor such as a pressure gauge, crack gauge, etc.
  • the above fiber grating or fiber strain sensing head is used, which makes the strain measuring system also obtain the corresponding beneficial technical effects. From the specific implementation, no other technical changes have occurred.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Optical Transform (AREA)

Abstract

L’invention concerne une tête de capteur de déformations à fibre ou à réseau de fibres, utilisée dans divers systèmes de contrôle des déformations en génie des structures complexes, comprenant un support, une fibre ou un réseau de fibres, et caractérisée en ce que ledit support présente une structure coudée comportant une partie flexible et une partie d’extrémité, et ladite fibre ou ledit réseau de fibres sont collés sur la surface extérieure ou la surface intérieure de ladite partie d’extrémité. L’invention concerne également un système de mesure de déformations comprenant ladite tête de capteur de déformations à fibre ou à réseau de fibres.
PCT/CN2005/001106 2004-08-16 2005-07-22 Tete de capteur de deformations a fibre ou a reseau de fibres et son systeme de mesure de deformations WO2006017974A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200420009255.6 2004-08-16
CN 200420009255 CN2720406Y (zh) 2004-08-16 2004-08-16 光纤光栅或光纤应变传感头及其应变测量***

Publications (1)

Publication Number Publication Date
WO2006017974A1 true WO2006017974A1 (fr) 2006-02-23

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CN (1) CN2720406Y (fr)
WO (1) WO2006017974A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107449369A (zh) * 2017-09-15 2017-12-08 浙江智远光电科技有限公司 安装便易的光纤光栅储能焊接式应变片
CN110057309A (zh) * 2019-05-21 2019-07-26 衢州学院 一种适用于多种工况的光纤光栅应变传感器及其安装拆卸方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104314936B (zh) * 2014-09-02 2016-07-06 广州大学 一种检测水平轴或梁应变的光纤光栅传感器快速粘贴器
CN104677302B (zh) * 2015-03-24 2017-11-24 北京航空航天大学 一种基于光纤光栅的三维传感器及其传感器主体
CN106017541B (zh) * 2016-07-29 2018-08-28 中铁第四勘察设计院集团有限公司 一种地铁接触网支架松动的在线监测装置及方法

Citations (6)

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Publication number Priority date Publication date Assignee Title
US5729335A (en) * 1996-08-23 1998-03-17 Mcdonnell Douglas Corporation Optical fiber monitoring apparatus and an associated method for monitoring bending or strain on an optical fiber during installation
CN2513078Y (zh) * 2001-12-07 2002-09-25 陈伟民 光纤法珀应变测量仪
JP2002286563A (ja) * 2001-03-28 2002-10-03 Kyowa Electron Instr Co Ltd 光ファイバ式ひずみゲージ
CN2570733Y (zh) * 2002-10-10 2003-09-03 张继昌 新型光纤应变传感器
CN2646668Y (zh) * 2003-09-05 2004-10-06 刘育梁 可重复使用的光纤光栅应变传感器
CN2651704Y (zh) * 2003-11-04 2004-10-27 刘育梁 光纤光栅应变传感器

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5729335A (en) * 1996-08-23 1998-03-17 Mcdonnell Douglas Corporation Optical fiber monitoring apparatus and an associated method for monitoring bending or strain on an optical fiber during installation
JP2002286563A (ja) * 2001-03-28 2002-10-03 Kyowa Electron Instr Co Ltd 光ファイバ式ひずみゲージ
CN2513078Y (zh) * 2001-12-07 2002-09-25 陈伟民 光纤法珀应变测量仪
CN2570733Y (zh) * 2002-10-10 2003-09-03 张继昌 新型光纤应变传感器
CN2646668Y (zh) * 2003-09-05 2004-10-06 刘育梁 可重复使用的光纤光栅应变传感器
CN2651704Y (zh) * 2003-11-04 2004-10-27 刘育梁 光纤光栅应变传感器

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107449369A (zh) * 2017-09-15 2017-12-08 浙江智远光电科技有限公司 安装便易的光纤光栅储能焊接式应变片
CN110057309A (zh) * 2019-05-21 2019-07-26 衢州学院 一种适用于多种工况的光纤光栅应变传感器及其安装拆卸方法
CN110057309B (zh) * 2019-05-21 2024-02-09 衢州学院 一种适用于多种工况的光纤光栅应变传感器的安装拆卸方法

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