WO2004048889A1 - 光ファイバー計測モジュール - Google Patents
光ファイバー計測モジュール Download PDFInfo
- Publication number
- WO2004048889A1 WO2004048889A1 PCT/JP2002/012353 JP0212353W WO2004048889A1 WO 2004048889 A1 WO2004048889 A1 WO 2004048889A1 JP 0212353 W JP0212353 W JP 0212353W WO 2004048889 A1 WO2004048889 A1 WO 2004048889A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- optical fiber
- base material
- measurement module
- strain
- module according
- Prior art date
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 307
- 239000000463 material Substances 0.000 claims abstract description 160
- 239000011247 coating layer Substances 0.000 claims abstract description 4
- 238000005259 measurement Methods 0.000 claims description 80
- 230000003287 optical effect Effects 0.000 claims description 33
- 230000010287 polarization Effects 0.000 claims description 22
- 238000005452 bending Methods 0.000 claims description 17
- 239000000758 substrate Substances 0.000 claims description 16
- 239000000835 fiber Substances 0.000 claims description 13
- 239000000853 adhesive Substances 0.000 claims description 9
- 230000001070 adhesive effect Effects 0.000 claims description 9
- 239000010410 layer Substances 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 6
- 230000008602 contraction Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 230000001902 propagating effect Effects 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 3
- 238000005253 cladding Methods 0.000 claims description 2
- 239000011295 pitch Substances 0.000 description 9
- 238000013461 design Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000002184 metal Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000001069 Raman spectroscopy Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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
- G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
- G01D11/30—Supports specially adapted for an instrument; Supports specially adapted for a set of instruments
-
- 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
- G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
- G01D11/24—Housings ; Casings for instruments
- G01D11/245—Housings for sensors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
-
- 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
-
- 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
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/14—Mode converters
-
- 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
- G02B6/24—Coupling light guides
- G02B6/36—Mechanical coupling means
- G02B6/3628—Mechanical coupling means for mounting fibres to supporting carriers
Definitions
- the present invention relates to an optical fiber measurement module for laying on a structure such as a bridge, a tunnel, or a building, and for measuring a physical quantity such as a strain or a temperature of the structure.
- optical fiber measuring modules have been developed that measure physical quantities such as strain and temperature of structures such as bridges, tunnels, and buildings using the characteristics of optical fibers.
- This optical fiber measuring module generally has an optical fiber core, a cladding, and a coating layer, and receives a discontinuous pump light such as a laser beam into the optical fiber core to cause distortion of the optical fiber core such as Brillouin scattering and Raman scattering.
- a discontinuous pump light such as a laser beam into the optical fiber core to cause distortion of the optical fiber core such as Brillouin scattering and Raman scattering.
- the optical fiber measuring module can measure a physical quantity at an arbitrary position in the longitudinal direction of the optical fiber core by controlling the sampling timing for detecting the scattered light.
- Various technologies have been developed that are applied to remote measurement of strain, temperature, etc., at an arbitrary position of an object.
- Japanese Patent Application Laid-Open No. 9-149927 discloses an optical fiber sensor comprising a metal tube and an optical fiber formed in a spiral shape in contact with the inner peripheral surface thereof, and a structure using the same. Techniques for measuring the strain of an object are disclosed.
- Japanese Patent Application Laid-Open No. 2002-31310 discloses that one or a plurality of optical fibers and cables are sandwiched between sheet materials through which an adhesive can penetrate and fixed.
- a sheet-like strain sensor technology for measuring the strain of a concrete structure and confirming the progress of damage to the concrete structure by bonding the sheet to the surface of the concrete structure using an adhesive is disclosed. Have been.
- the sheet-like optical fiber measuring module is bonded to the surface of the concrete structure using an adhesive, so that Not only is it not easy to install and remove, but also there is a problem that when the sheet is peeled off, an excessive load acts on the optical fiber-to-cable, and the optical fiber core is easily damaged.
- the present invention has been made in view of the above problems, and provides an optical fiber measurement module that can be easily attached to and detached from a structure and does not damage an optical fiber core that requires delicate handling when attaching and detaching. The challenge is to do so. Disclosure of the invention
- the present invention for solving the above problems is an optical fiber measurement module laid on a structure, for measuring at least one physical quantity of strain or temperature of the structure.
- An optical fiber single-core wire having a layer, a base material for holding the optical fiber core wire, and a joint for attaching the base material to a structure
- the optical fiber measuring module is provided with a base material for holding the optical fiber single core wire, so that the optical fiber measurement module can be handled by handling the base material, and it is necessary to directly handle the optical fiber core wire, which requires careful attention. There is no.
- the optical fiber measurement module can be easily attached to the structure without affecting the optical fiber core wire.
- a mounting means provided between the connecting member and the structure for mounting the mounting member to the structure, and a base material provided between the base material and the connecting member 2.
- the mounting means for mounting the mounting member to the structure is provided between the mounting member and the structure, the structure and the mounting member can be easily processed without processing each time.
- the connecting member can be attached to the structure.
- the base material is sequentially attached to the connecting member with the mounting member attached to the structure.
- the optical fiber measuring module can be easily attached to the structure.
- the attachment means preferably has a joining layer provided on the joining member and made of an adhesive or a welding agent for joining the joining member and the structure. (Claim 3).
- the connecting member is attached to the structure by the attaching means provided on the connecting member and having a joining layer made of an adhesive or a welding agent for joining the joining member and the structure, the single core fiber of the optical fiber is damaged. It is possible to attach the connecting member to the structure without giving any trouble.
- the mounting means may be provided in the structure such that an opening is narrower than a bottom.
- the fitting member is attached to the structure by pushing the engaging projection provided on the fitting member into the locking groove with the bottom and engaging with the locking groove via an elastic sheet made of an elastic member. It is preferable to have (claim 4).
- the structure is formed by an attaching means that pushes the engaging protrusion provided on the attaching member through the elastic sheet into the bottomed engaging groove having the opening narrower than the bottom. Since the connecting member is attached to the structure, the connecting member can be attached to the structure without damaging the single core optical fiber.
- the locking means locks the base material by locking a locking portion provided on the mounting member with an engaging portion provided on the base material and engaging with the locking portion of the mounting member. It is preferable to lock the member (Claim 5).
- the base member is locked to the engaging member by the locking means of locking the engaging portion provided on the base member to the locking portion provided on the connecting member. No other components such as screws are required, and the base material can be attached to the connecting member with one touch.
- the locking means may be configured such that the pitch of the locking portions provided on the connecting member and the pitch of the engaging portions provided on the base material are different from each other, and the base material locked by the connecting member is It is preferable to set the initial strain of the optical fiber core for correcting the zero point of the measured value by giving a strain related to expansion or contraction. (Claim 6).
- the pitch of the locking portion provided on the joining member and the pitch of the engaging portion provided on the base material are set to different intervals, and the pitch of the engaging portion provided on the base member is increased.
- the initial strain of the single optical fiber for correcting the zero point of the measured value can be set, so that the spatial position of the optical fiber measurement module can be displayed.
- the base material holds two or three cores of the optical fiber at a predetermined distance from each other, and It is possible to measure at least one state quantity of the extension, bending and partial lateral pressure of the structure on which the optical fiber measuring module is laid from the measured value of the strain of the core wire and the pattern of increase and decrease of the measured value.
- the optical fiber-one measurement module according to any one of claims 1 to 6, characterized in that:
- the base material holds two or three optical fiber cores at a predetermined distance from each other, thereby increasing the measured value of the strain of the optical fiber core and the increase / decrease of the measured value. Since it is possible to measure at least one of the stretch, bend, and partial lateral pressure of the structure on which the optical fiber measurement module is laid from the pattern, it is possible to measure the state of the structure, such as deformation or distortion. Can be performed efficiently from a remote location.
- the base material is formed in a band shape, and holds the two optical fiber single-core wires so as to be separated from each other by a predetermined distance along the longitudinal direction of the base material.
- the two optical fiber cores are held at a predetermined interval from each other along the longitudinal direction of the strip-shaped base material, so that the structure can be simplified with a simple structure. Measurement of state quantities such as planar deformation and distortion can be performed efficiently from a remote location.
- the base material includes a band-shaped flat plate portion and a wall portion that stands substantially vertically at substantially the center of the flat plate portion, and two base plates are provided in the longitudinal direction of the flat plate portion.
- the optical fiber cores are held so as to be spaced apart from each other by a predetermined distance, and another optical fiber core is held in a longitudinal direction of a wall portion.
- the optical fiber measuring module comprises two optical fibers in a longitudinal direction of the band-shaped flat plate portion.
- the base material is formed in a tubular shape, and holds the three optical fiber single-core wires in a longitudinal direction of an inner wall of the tubular base material at a predetermined interval from each other.
- An optical fiber-measuring module according to any one of claims 1 to 7, characterized in that the module is an optical fiber-measuring module (claim 10).
- the three optical fiber cores are held at a predetermined interval in the longitudinal direction of the inner wall of the tubular base material, the three-dimensional structure of the structure is simple. Measurement of state quantities such as deformation and distortion can be performed efficiently from a remote location.
- Another preferred embodiment of the present invention is the optical fiber measurement module according to claim 10, wherein the single core optical fiber is spirally held on an inner wall of the tubular base material. (Claim 11 1).
- the single optical fiber is spirally held on the inner wall of the tubular base material, the strain acting in the core direction of the single optical fiber with respect to the deformation in the longitudinal direction of the base material.
- the base material is handled by forming a slit that increases the flexibility of the base material so as to avoid the held optical fiber single core wire.
- the optical fiber-one measuring module according to any one of claims 1 to 11, wherein the optical fiber-one measuring module can be laid without exceeding an allowable strain of the optical fiber single-core wire. (Claim 12). .
- a slit is formed in the base material to increase the flexibility of the base material, and it can be laid without exceeding the allowable strain of the optical fiber core wire during handling. This makes it possible to provide a highly effective optical fiber single measurement module without deteriorating the performance.
- the base material is formed with a slit that increases the flexibility of the base material so as to avoid the held single-core optical fiber.
- a slit is formed in the base material to increase the flexibility of the base material so as to avoid the held optical fiber core wire, and the optical fiber-one measurement module is laid. Since it is possible to prevent the deformation of the single optical fiber from exceeding the allowable value even for excessive deformation of the object, highly versatile light that can be applied to structures where large deformation is expected It can be a fiber-to-measurement module.
- the base material holds the optical fiber core in a wave shape and is located on an extension of a tangent to the optical fiber core which transitions from the peak to the trough of the wave.
- a notch is formed at the side end of the material to bend the base material.
- the base material holds the optical fiber core in a wavy shape, and the side of the base positioned on an extension of a tangent to the optical fiber core that transitions from a wave crest to a valley.
- a notch is formed at the end to bend the base material, and when the base material is bent, this cut and bending along the optical fiber core line cause only the twist of the optical fiber core line to occur. Since it is possible to prevent the allowable strain related to bending from being exceeded, a highly versatile optical fiber measurement module that can be applied to a corner portion of a structure can be obtained.
- another preferred embodiment of the present invention includes the above-described base material having a standardized length, and optical fiber core wire connecting portions provided at both ends of the standardized base material.
- the optical fiber includes a base material having a standardized length, and a connecting portion of the optical fiber core wires provided at both ends of the base material, and the connecting portions of the optical fiber core wires are connected to each other.
- Another preferred embodiment of the present invention is to provide a polarization ring having a single optical fiber in a ring shape, and to calibrate the polarization state of the signal light propagating in the single optical fiber with the polarization ring.
- the optical fiber-one measurement module according to any one of claims 1 to 15, characterized by the following (Claim 16).
- the polarization state of the signal light propagating in the single-core optical fiber can be calibrated by the polarization ring in which the single-core optical fiber is formed in a ring shape, so that accurate measurement can be performed. .
- another preferred embodiment of the present invention includes a ring base for holding the optical fiber core of the polarization ring, and a loading mechanism capable of applying a strain in a circumferential direction of the ring base.
- the loading mechanism applies a strain in the circumferential direction of the ring base material, thereby making it possible to apply a strain to the optical fiber core held by the ring base material and calibrate the strain.
- it is possible to apply a strain in the circumferential direction of the ring base holding the single optical fiber of the polarization ring.
- the loading mechanism includes a discontinuous portion provided on the ring substrate, a loading member abutting on both ends of the ring substrate facing the discontinuous portion, and a loading member.
- a loading member shaft that is provided substantially at the center of the ring member and rotatably supports the loading member.
- FIG. 1 is a perspective view showing a configuration of an optical fiber measuring module according to a first embodiment of the present invention.
- FIG. 2 shows the structure of the optical fiber measurement module according to the first embodiment of the present invention.
- FIG. 6 is a perspective view showing attachment to the camera.
- FIG. 3 is a perspective view illustrating a configuration of an optical fiber measuring module according to a second embodiment of the present invention.
- FIG. 4 is a cross-sectional view showing a modification of the locking means in the optical fiber measurement module according to the second embodiment of the present invention.
- FIG. 4 (a) shows a state where the base material is attached to the joining member by the locking means. The state is shown.
- (B) shows a state in which the base material is being removed from the joining member.
- FIG. 5 is an explanatory diagram showing a configuration of an optical fiber measuring module according to a third embodiment of the present invention.
- FIG. 5 (a) shows an optical fiber measuring module according to the third embodiment.
- FIG. 3 is a plan view showing a configuration.
- (B) is a side view of the connecting member.
- (c) is a graph showing the magnitude of the strain acting on the single core fiber of the optical fiber after the base material is attached to the joining member.
- FIG. 6 is a perspective view illustrating a configuration of an optical fiber measuring module according to a fourth embodiment of the present invention.
- FIG. 7 is a diagram showing a configuration of an optical fiber measuring module according to a fifth embodiment of the present invention, and (a) is a perspective view of the optical fiber measuring module. (B) is an explanatory view showing the effect of the optical fiber-one measurement module.
- FIG. 8 is a perspective view showing a configuration of an optical fiber measuring module according to a sixth embodiment of the present invention.
- FIG. 9 is a perspective view illustrating a configuration of an optical fiber measuring module according to a seventh embodiment of the present invention.
- FIG. 10 is a perspective view showing a configuration of an optical fiber measuring module according to an eighth embodiment of the present invention.
- FIG. 11 is a sectional view showing the operation of the optical fiber measuring module according to the eighth embodiment of the present invention.
- FIG. 12 is a perspective view showing a configuration of an optical fiber measuring module according to a ninth embodiment of the present invention.
- FIG. 13 is a perspective view showing the configuration of the optical fiber measuring module according to the tenth embodiment of the present invention.
- FIG. 14 is a perspective view showing the configuration of the optical fiber measuring module according to the eleventh embodiment of the present invention.
- FIG. 15 is a perspective view showing a configuration of a unit of the optical fiber measuring module according to the eleventh embodiment of the present invention.
- FIG. 16 is a perspective view showing a configuration of a polarization ring of the optical fiber measurement module according to the eleventh embodiment of the present invention.
- FIGS. 17A and 17B are side views showing the configuration of the loading mechanism of the polarization ring.
- FIG. 17A shows a state in which the gap between the discontinuous portions is not changed by the loading member, and FIG. This shows a state in which the interval between the discontinuous portions has been changed.
- FIG. 18 shows a modified example of the base material
- FIG. 18A is a perspective view of a modified example of the base material
- (b) is a graph of the strain of the single core optical fiber showing the effect of the modification of the base material.
- the illustrated optical fiber measurement module 10 has a structure in which the optical fiber single core wire 2 is laid on the structure 1, and the distortion of the structure 1 Or to measure at least one of the physical quantities of temperature.
- the structure 1 In order to be able to attach to the structure 1 without affecting the single-core optical fiber 2 that requires 1 and a mounting member 4 for mounting the mounting member 1.
- an attaching means is provided between the connecting member 4 and the structure 1. 5 is provided so that the connecting member 4 can be easily attached to the structure 1.
- the base material 3 is sequentially locked to the connecting member 4 in a state where the connecting member 4 is attached to the structure 1, so that the optical fiber—the measuring module 10 can be attached to the structure 1.
- a locking means 6 is provided between the base member 3 and the connecting member 4, so that the base member 3 can be easily locked to the connecting member 4.
- the optical fiber core 2 receives a discontinuous pump light such as a laser beam to generate scattered light, such as Brillouin scattering or Raman scattering, which is derived from distortion or temperature of the optical fiber core 2, and scattered light.
- the optical fiber core 2a is used to measure physical quantities such as strain and temperature of the optical fiber core wire 2 and has an optical fiber core 2a, a clad 2b, and a coating layer 2c.
- the base material 3 is for holding the optical fiber single core wire 2 and is made of a plate material having a certain degree of flexibility, such as a metal thin plate or a synthetic resin plate material, and is connected via a connecting member 4. It is configured so that it can be attached to structures 1 of various shapes.
- the connecting member 4 is provided to attach the base material 3 to the structure 1.
- the connecting member 4 is also made of a plate material having a certain degree of flexibility, such as a thin metal plate or a synthetic resin plate. It is configured so that it can be attached to the structure 1 having the shape shown in FIG.
- the mounting means 5 is used to connect the optical fiber core 2 without damaging it.
- an adhesive or a welding agent provided on the joint member 4 to join the joint member 4 and the structure 1 is used. It is configured to have a bonding layer 7 made of. Therefore, the connecting member 4 can be attached to the structure 1 without considering the optical fiber core wire 2.
- the locking means 6 is also provided on the mounting member 4 so that the base member 3 can be mounted on the mounting member 4 with a single switch without requiring other parts for mounting screws or the like.
- the engaging portion 6a of the base material 3 engaging with the engaging portion 6a is engaged with the engaging portion 6a so that the base material 3 is engaged with the engaging member 4. .
- the optical fiber measuring module 10 includes a base material 3 holding an optical fiber core 2. Therefore, it is sufficient to handle the base material 3 when handling the optical fiber-to-measurement module, and it is not necessary to directly handle the optical fiber core wire 2 that requires careful attention. In addition, since there is a connecting member 4 for attaching the base material 3 to the structure 1, it is easy to attach the optical fiber measurement module to the structure 1 without affecting the optical fiber core wire 2. Can be.
- the mounting means 5 for mounting the connecting member 4 to the structure 1 is provided between the connecting member 4 and the structure 1.
- the connecting member 4 can be easily attached to the structure 1.
- the locking means 6 for locking the base member 3 to the connecting member 4 is provided between the base member 3 and the connecting member 4, in a state where the connecting member 4 is attached to the structure 1, By sequentially locking the base material 3 to the connecting member 4, the optical fiber measurement module can be easily attached to the structure 1.
- the The connecting member 4 is attached to the structure 1 by the attaching means 5 having a bonding layer 7 made of an adhesive or a welding agent for joining the connecting member 4 and the structure 1, and other parts for attaching screws and the like.
- the connecting member 4 can be easily attached to the structure 1 with one touch without the need for a component.
- the locking means 6 for locking the engaging portion 6 b provided on the base member 3 to the locking portion 6 a provided on the connecting member 4. Since the base member 3 is locked to the connecting member 4, the base member 3 can be attached to the connecting member 4 by a pinch switch without needing any other parts such as screws. .
- FIG. 3 is a perspective view showing a configuration of an optical fiber measuring module 20 according to the second embodiment of the present invention.
- the mounting means 5 is such that the connecting member 4 can be easily mounted to the structure 1 with one touch.
- the engaging member 5 d and the elastic sheet 5 e made of an elastic member are provided, and the engaging member 5 d is pushed into the locking groove 5 c via the flexible sheet 5 e, so that the connecting member 4 is attached to the structure 1. It is configured to be attached.
- the optical fiber measuring module 20 includes an engaging protrusion 5 d provided on the connecting member 4 and an elastic sheet. 5
- the mounting member 4 can be attached to the structure 1 by the mounting means 5 that is pressed into the bottomed locking groove 5c via e, so that other parts such as screws are required. Therefore, the connecting member 4 can be easily attached to the structure 1 with one touch.
- FIG. 4 is a sectional view showing a modified example of the locking means 6 in the optical fiber measuring module according to the second embodiment of the present invention.
- 3 shows a state where 3 is attached to the connecting member 4.
- (B) shows a state where the base material 3 is being removed from the joining member 4.
- the locking means 6 has a zipper structure.
- the engaging portion 6a provided on the connecting member 4 is formed in a hook shape so that it can be attached, and the engaging portion 6a provided on the base member 3 and engaging with the engaging portion 6a of the connecting member 4 is provided.
- the joint 6b is formed in a hook shape that can be engaged with the hook-shaped locking portion 6a.
- a modified example of the locking means 6 has a zipper structure, whereby the base material 3 is detachably locked to the member 4 by sequentially and sequentially engaging one end of the locking means 6. It is configured to be able to.
- the locking member 6a provided on the connecting member 4 and the hook-shaped locking portion 6a is provided on the base material 3.
- the locking means 6 having a zipper structure for locking the hook-shaped engaging portion 6b allows the locking means 6 to sequentially engage with the locking portion 6a sequentially from one end of the locking means 6. Since the base portion 3 is detachably locked to the connecting member 4 by engaging the joint portion 6b, the work of attaching the base member 3 to the connecting member 4 can be extremely facilitated.
- the base member 3 can be sequentially attached and detached from one end of the locking means 6 as a result. It is configured so that it can be locked in place.
- FIG. 5 is an explanatory view showing the configuration of an optical fiber measuring module 30 according to the third embodiment of the present invention, and (a) is an optical fiber measuring module 30 according to the third embodiment.
- FIG. 3 is a plan view showing a configuration of 0.
- B) is a side view of the connecting member 4.
- C) is a graph showing the magnitude of strain acting on the optical fiber core wire 2 after the base material 3 is attached to the joining member 4.
- the locking means 6 is provided with a pitch S1, a locking section 6.a provided on the connecting member 4.
- S 2 and the pitch S 3 of the engaging portion 6 b provided on the base member 3 are set at different intervals, and the base member 3 locked by the connecting member 4 is subjected to strain related to expansion or contraction, thereby
- the optical fiber core 2 is configured to be able to set the initial distortion.
- the locking portion 6a provided on the connecting member 4 The pitches S 1, S 2 and the pitch S 3 of the engaging portion 6 b provided on the base material 3 are set at different intervals, and the base material 3 locked by the connecting member 4 is stretched or contracted. Since the strain can be applied, the initial strain of the optical fiber single core wire 2 can be set, so that the measurement range of the optical fiber measurement module 30 can be set to an appropriate state.
- FIG. 6 is a perspective view showing a configuration of an optical fiber measuring module 40 according to a fourth embodiment of the present invention.
- the base material 3 holds two optical fiber single core wires 2 at a predetermined interval from each other.
- It is configured to measure at least one state quantity of the partial lateral pressure from a measured value of the strain of the optical fiber core wire 2 and a pattern of increase and decrease of the measured value.
- the base material 3 is used to measure the state quantity such as the planar deformation and distortion of the structure 1 with a simple structure and to efficiently perform the measurement from a remote place.
- the optical fiber 1 is formed in a strip shape and is configured to hold the two optical fiber core wires 2 so as to be spaced apart from each other at a predetermined interval along the longitudinal direction of the substrate 3.
- the operation of the optical fiber-measuring module 40 according to the fourth embodiment will be described.
- the base material 3 is composed of the optical fiber core wires 2d and 2e.
- the measured value of the distortion of the optical fiber core wire 2 and the extension of the structure 1 on which the optical fiber measurement module is laid from the increase / decrease of the measured value As a result, it is possible to measure at least one state quantity of bending, partial lateral pressure, and the like, and to efficiently measure the state quantity such as deformation and strain of the structure 1 from a remote place.
- the two optical fibers 1 d and 2 e are held at predetermined intervals along the longitudinal direction of the base material 3 formed in a strip shape, With a simple structure, it is possible to efficiently measure state quantities such as planar deformation and distortion of the structure 1 from a remote location. ,
- FIG. 7 is a diagram showing a configuration of an optical fiber measuring module 50 according to a fifth embodiment of the present invention, and (a) is a perspective view of the optical fiber measuring module 50. (B) is an explanatory view showing the effect of the optical fiber measuring module 50.
- the base material 3 measures a state quantity such as three-dimensional deformation and distortion of the structure 1.
- a strip-shaped flat plate portion 3a and a wall portion 3b which stands substantially vertically at substantially the center of the flat plate portion 3a are provided, two of which are provided in the longitudinal direction of the flat plate portion 3a.
- the optical fiber core wire 2: f is held in the longitudinal direction of the wall 3 b. .
- the optical fiber measuring module 50 two optical fiber measuring modules 50 are provided in the longitudinal direction of the band-shaped flat plate portion 3a.
- the optical fiber cores 2 d and 2 e are held at a predetermined distance from each other, and another optical fiber core 2 ⁇ is held in the longitudinal direction of the wall 3 b that stands substantially vertically. Since the optical fiber core wire 2 is three-dimensionally arranged, it is possible to efficiently measure the state quantity of the structure 1 such as three-dimensional deformation and distortion from a remote place with a simple structure. it can.
- this optical fiber measuring module 50 when the central axis of the base material 3 is stretched in the X-axis direction, the fiber cores 2d, 2e , 2 ⁇ elongation strain is observed as + respectively, and when lateral pressure acts on the C section in the ⁇ axis direction, only the elongation strain of the fiber core 2 f is observed as +, and bending acts around the z axis. In this case, the elongation strain of the fiber core 2 d is observed as +, whereas the elongation strain of the fiber core 2 e is observed as 1.
- FIG. 8 is a perspective view showing a configuration of an optical fiber measuring module 60 according to a sixth embodiment of the present invention.
- the base material 3 measures the state quantity of the structure 1 such as three-dimensional deformation and distortion.
- this tubular base material 3 in the longitudinal direction of the inner wall
- the three single optical fibers 1d, 2e, and 2f are configured to be held at a predetermined interval from each other.
- the optical fiber measuring module 60 According to the optical fiber measuring module 60, three optical fiber measuring modules 60 are provided in the longitudinal direction of the inner wall of the tubular base material 3.
- the single-core optical fibers 2d, 2e, and 2f are held at a predetermined distance from each other, and the single-core optical fibers 2 are three-dimensionally arranged. Measurement of state quantities such as distortion can be performed efficiently from a remote place with a simple structure.
- the optical fiber-measuring module 60 according to the sixth embodiment has a fiber as shown in FIG. 7 (b).
- FIG. 9 is a perspective view showing a configuration of an optical fiber measuring module 70 according to a seventh embodiment of the present invention.
- one optical fiber core wire 2 d, 2 e, 2 is applied to the deformation of the tubular base material 3 in the longitudinal direction.
- the base material 3 is held so that it can be applied to structures 1 having various shapes such as a structure 1 having a curvature.
- a slit 8 for increasing the flexibility of the substrate 3 is formed so as to avoid the optical fiber single core wires 2 d, 2 e, and 2 f.
- optical fiber measuring module 70 The operation of the optical fiber measuring module 70 according to the seventh embodiment is described below.
- one optical fiber core wire 2d, 2e, 2f is spirally held on the inner wall of the tubular substrate 3, so that the longitudinal direction of the substrate 3
- the strain acting in the direction of the cores 2 d, 2 e, and 2 f of the core of the optical fiber can be made relatively small with respect to the deformation of the optical fiber. Can be 0.
- the slit 8 that increases the flexibility of the base material 3 by avoiding the held optical fiber—cores 2d, 2e, and 2f is provided. Since the slits 8 are formed in the base member 3, the slits 8 restrict the maximum bending bending curvature of the base member 3, so that it is possible to prevent light leakage in the optical waveguides of the single-core optical fibers 2 d, 2 e, and 2 f.
- a highly safe optical fiber measurement module that can be used.
- FIG. 10 is a perspective view showing a configuration of a light: 7 eyebar measurement module 80 according to an eighth embodiment of the present invention
- FIG. 11 is an optical fiber according to an eighth embodiment of the present invention.
- FIG. 9 is a cross-sectional view showing the operation of the measurement module 80.
- the base material 3 measures a state quantity such as three-dimensional deformation or distortion of the structure 1.
- a strip-shaped flat plate portion 3a and a wall portion 3b that stands substantially vertically at substantially the center of the flat plate portion 3a are provided, two of which are provided in the longitudinal direction of the flat plate portion 3a.
- the optical fiber cores 2d and 2e are held at a predetermined distance from each other, and the other optical fiber core 2f is held in the longitudinal direction of the wall 3b. ing.
- strip-shaped flat plate portion 3a and the wall portion 3b of the base member 3 are arranged so as to avoid the held single optical fiber core wires 2d, 2e, and 2f so that the base member 3 is flexible.
- a slit 8 is formed to increase the performance.
- the operation of the optical fiber measuring module 80 according to the eighth embodiment will be described.
- the interval between slits 8 is S4
- the width is S5
- the height is d
- the minimum bending angle is S4 / drad
- the minimum circle diameter is 2 (S4 + S5) d / S4. From this, by determining the specifications of the slit 8 so that the minimum bending angle does not exceed the allowable bending angle of the optical fiber core wire 2, light loss due to excessive bending can be avoided.
- the flexibility of the base material 3 is set so as to avoid the held optical fiber cores 2 d, 2 e, and 2 f.
- a slit 8 is formed on the base material 3 to increase the deformation of the optical fiber core wires 2 d, 2 e, and 2 f so that the deformation of the optical fiber core wires 2 d, 2 e, and 2 f does not exceed the allowable value even if the structure 1 is excessively deformed. Since it is possible, it is possible to provide a highly versatile optical fiber measuring module 80 that can be applied to the structure 1 where large deformation is expected.
- FIG. 12 is a perspective view showing a configuration of an optical fiber measuring module 90 according to a ninth embodiment of the present invention.
- the base material 3 has a simple structure for measuring state quantities such as deformation and strain of the structure 1. In order to be able to perform the operation efficiently from a remote place, it is formed in a belt shape, and is configured to hold one optical fiber core wire 2 along the longitudinal direction of the substrate 3. In addition, the base material 3 is made so as to avoid the optical fiber core wire 2 holding the slit 8 which increases the flexibility of the base material 3 so that the deformation of the optical fiber core wire 2 does not exceed the allowable value. Is formed.
- the slit 8 for relaxing the extension of the substrate 3 Therefore, even if the structure 1 on which the optical fiber measurement module 90 is laid is excessively deformed, the deformation of the optical fiber core wire 2 is
- a highly versatile optical fiber measurement module 90 that can be applied to the structure 1 where large deformation is expected can be realized. ing.
- FIG. 13 is a perspective view showing a configuration of an optical fiber measuring module 100 according to the tenth embodiment of the present invention.
- the base material 3 holds the optical fiber core wire 2 in a wavy shape, and also has a wave peak to a valley.
- a notch 9 for bending the base material 3 is formed at a side end of the base material 3 located on an extension of the tangent line of the optical fiber core wire 2 to be transferred.When the base material 3 is bent, the cut 9 and the light The base material 3 is configured to bend along the fiber core 1.
- the optical fiber measuring module 100 when the substrate 3 is bent, the cut 9 In the bending position determined by the optical fiber core 2, the substrate 3 can be bent along the optical fiber core 2 only by receiving the twist, so that the optical fiber measuring module 100 is attached to the corner of the structure 1. It can be provided in part 11.
- FIG. 14 is a perspective view showing a configuration of an optical fiber measurement module 110 according to the eleventh embodiment of the present invention.
- FIG. 15 is an optical fiber according to the eleventh embodiment of the present invention.
- FIG. 3 is a perspective view showing a configuration of a unit of the fiber measurement module 110.
- FIG. 16 is a perspective view showing the configuration of the polarization ring 12 of the optical fiber measurement module 110 according to the first embodiment of the present invention, and
- FIG. 2A is a side view showing the configuration of the loading mechanism 14 of FIG. 2, and FIG. (B) shows a state in which the interval between the discontinuous portions 15 has been changed by the loading member 16.
- the base material 3 having a standardized length, A connection portion 2d of the optical fiber core wire 2 provided at both ends of the standardized base material 3, and the connection portions 2d of the optical fiber core wire 2 are optically connected to each other to form a base material.
- the optical fiber measuring module 110 includes a polarization ring 12 in which the optical fiber core wire 2 is formed in a ring shape. It is configured so as to calibrate the polarization state of the signal light propagating in the single optical fiber 2.
- the polarization ring 12 is a single-mode (SM) optical fiber core wire 2 wound in a ring shape, and holds the optical fiber core wire 2 of the polarization ring 12 as shown in FIG.
- the optical fiber single-core wire 2 held by the ring base material 13 is configured to be capable of applying a strain to calibrate the strain.
- the loading mechanism 14 includes a discontinuous portion 15 provided on the ring substrate 13 and both end portions of the ring substrate 13 facing the discontinuous portion 15. And a loading member shaft 17 provided at substantially the center of the loading member 16 and rotatably supporting the loading member 16, as shown in FIG. 17 (b). By rotating the loading member 16 around the loading member shaft 17, the distance between the discontinuous portions 15 of the ring base material 13 is changed to change the distortion of the ring base material 13. ing.
- the optical fiber according to the eleventh embodiment The operation of the measurement module 110 will be described.
- the base material 3 having a standardized length and the optical fiber core wires provided at both ends of the base material 3 are provided.
- the connecting portions 2 d of the single optical fiber 2 are optically connected to each other, and the base materials 3 are sequentially connected to each other to form structures 1 having different dimensions. Since it is possible to cope with this problem, it is possible to provide a more versatile optical fiber-to-measurement module 110.
- the optical fiber—propagating in the core wire 2 is formed by the polarization ring 12 in which the optical fiber core wire 2 is formed in a ring shape. Since the polarization state of the generated signal light can be calibrated, accurate measurement becomes possible.
- strain can be applied in the circumferential direction of the ring base material 13 holding the optical fiber core wire 2 of the polarization ring 12.
- a strain is applied to the optical fiber core wire 2 held by the ring base material 13 to calibrate the strain of the optical fiber measurement module.
- discontinuity of the loading mechanism 14 can be achieved.
- the ring base material 1 is rotated by rotating the loading member 16 abutting on both ends of the ring base material 13 facing the part 15 around a loading member shaft 17 provided substantially at the center of the loading member 16.
- the optical fiber single core wire 2 is It is not necessarily required to be held in a linear, wavy, or spiral shape as shown in the figure, and the holding form can be variously changed in design.
- the base material 3 is not necessarily limited to a band shape, a plate shape, or a tubular shape as shown in the drawing, and various design changes are possible as long as the shape can hold the optical fiber core wire 2.
- FIG. 18 is a modified example of the base material 3, and (a) is a perspective view of the modified example of the base material 3.
- (B) is a graph of the strain of the optical fiber single core wire 2 showing the effect of the modification of the substrate 3.
- the base material 3 may have a shape such as a split cylindrical member 3 c or 3 d which holds the optical fiber single core wire 2 at the center.
- the columnar members 3c and 3d shown in the same figure have irregularities provided on one of the columnar members 3c at the interval S8, and the interval S8 on the other columnar member 3d is slightly smaller. Irregularities are provided at intervals S9 and S10 different from each other, so that they are engaged with each other and the optical fiber single core wire 2 is bonded to one of the columnar members 3c. As a result, as shown in FIG.
- the connecting member 4 is not necessarily limited to a plate shape as shown in the drawing, and various designs can be changed as long as the base member 2 can be attached to the structure 1.
- the mounting means 5 is not limited to the bonding layer 7 made of an adhesive or a welding agent, but is also provided in the bottomed locking groove 5c of the structure 1 as shown in FIG.
- the present invention is not limited to the configuration in which the substrate is pushed in, and various design changes are possible.
- the slit 8 for increasing the flexibility of the base member 3 is not necessarily limited to the illustrated shape. It is formed so as to avoid the held optical fiber single core wire 2, and is flexible Various design changes are possible as long as they increase the performance.
- the loading mechanism 14 of the polarization ring 12 is not necessarily limited to the illustrated shape, and the optical fiber held by the ring base 13 is provided by applying a strain in the circumferential direction of the ring base 13.
- Various design changes are possible as long as distortion can be calibrated by adding distortion to the core wire 2.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Optical Transform (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/535,572 US7356238B2 (en) | 2002-11-27 | 2002-11-27 | Optical fiber measuring module having base member holding optical fiber cable |
AU2002349723A AU2002349723A1 (en) | 2002-11-27 | 2002-11-27 | Optical fiber measuring module |
CN02829951.5A CN100487363C (zh) | 2002-11-27 | 2002-11-27 | 光纤测量组件 |
PCT/JP2002/012353 WO2004048889A1 (ja) | 2002-11-27 | 2002-11-27 | 光ファイバー計測モジュール |
JP2004554942A JP4314197B2 (ja) | 2002-11-27 | 2002-11-27 | 光ファイバー計測モジュール |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2002/012353 WO2004048889A1 (ja) | 2002-11-27 | 2002-11-27 | 光ファイバー計測モジュール |
Publications (1)
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WO2004048889A1 true WO2004048889A1 (ja) | 2004-06-10 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2002/012353 WO2004048889A1 (ja) | 2002-11-27 | 2002-11-27 | 光ファイバー計測モジュール |
Country Status (5)
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---|---|
US (1) | US7356238B2 (ja) |
JP (1) | JP4314197B2 (ja) |
CN (1) | CN100487363C (ja) |
AU (1) | AU2002349723A1 (ja) |
WO (1) | WO2004048889A1 (ja) |
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JP2006284504A (ja) * | 2005-04-04 | 2006-10-19 | Denso Corp | 車両用衝突検出装置 |
JP2007218720A (ja) * | 2006-02-16 | 2007-08-30 | Mitsubishi Electric Corp | 光ファイバ変形検知センサ |
JP4730124B2 (ja) * | 2006-02-16 | 2011-07-20 | 三菱電機株式会社 | 光ファイバ変形検知センサ |
JP2008191076A (ja) * | 2007-02-07 | 2008-08-21 | Chishin Go | 腐食監視装置 |
JP2009150800A (ja) * | 2007-12-21 | 2009-07-09 | Nippon Telegr & Teleph Corp <Ntt> | 光ファイバセンサ及び光ファイバセンサを用いた歪み及び温度測定方法 |
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CN100487363C (zh) | 2009-05-13 |
US20060001863A1 (en) | 2006-01-05 |
CN1695041A (zh) | 2005-11-09 |
US7356238B2 (en) | 2008-04-08 |
JPWO2004048889A1 (ja) | 2006-03-23 |
AU2002349723A1 (en) | 2004-06-18 |
JP4314197B2 (ja) | 2009-08-12 |
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