WO2021176667A1 - テープ心線を用いた測定装置及び測定方法 - Google Patents

テープ心線を用いた測定装置及び測定方法 Download PDF

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Publication number
WO2021176667A1
WO2021176667A1 PCT/JP2020/009515 JP2020009515W WO2021176667A1 WO 2021176667 A1 WO2021176667 A1 WO 2021176667A1 JP 2020009515 W JP2020009515 W JP 2020009515W WO 2021176667 A1 WO2021176667 A1 WO 2021176667A1
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WO
WIPO (PCT)
Prior art keywords
strain
amount
core wire
core wires
curvature
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/JP2020/009515
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English (en)
French (fr)
Japanese (ja)
Inventor
中村　篤志
飯田　大輔
博之 押田
岡本　達也
友和 小田
脇坂　佳史
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.)
NTT Inc
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to US17/798,172 priority Critical patent/US11788909B2/en
Priority to PCT/JP2020/009515 priority patent/WO2021176667A1/ja
Priority to JP2022504896A priority patent/JP7306565B2/ja
Publication of WO2021176667A1 publication Critical patent/WO2021176667A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
    • 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
    • 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
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/0028—Force sensors associated with force applying means
    • G01L5/0042—Force sensors associated with force applying means applying a torque

Definitions

  • the present disclosure relates to a measuring device and a measuring method for measuring curvature and torsion.
  • Shape sensing using optical fiber is attracting attention.
  • it is necessary to obtain the curvature and torsional coefficient applied to the optical fiber.
  • the strain distribution in the longitudinal direction of each core is determined by OFDR (Optical Frequency Domine Reflectometry) or the like.
  • OFDR Optical Frequency Domine Reflectometry
  • an object of the present disclosure is to provide a method and an apparatus for acquiring a curvature / torsion of a curve using an inexpensive sensor medium.
  • the present disclosure uses a tape core wire as a sensor medium in shape sensing using an optical fiber, and uses a reflection measurement method such as B-OTDR (Brillouin Optical Time Domain Reflectometer) or OFDR for each core.
  • B-OTDR Bendouin Optical Time Domain Reflectometer
  • OFDR Orthogonal Reflectometer
  • the measuring device is A tape core wire in which multiple core wires are arranged in parallel, A strain measuring unit that measures the amount of strain on the plurality of core wires, and a strain measuring unit.
  • the measurement method according to the present disclosure is described. It is a measurement method performed by a measuring device.
  • the measuring device is connected to a tape core wire in which a plurality of core wires are arranged in parallel.
  • the measuring device The amount of strain on the plurality of core wires is measured, and The curvature and torsion of the tape core wire are obtained by using the amount of strain between the core wire arranged at the center and the core wire arranged at the outer edge of the plurality of core wires.
  • a general-purpose tape core wire is used as a sensor medium, it is possible to reduce the cost of shape sensing.
  • This is an example of a system configuration according to the present disclosure.
  • An example of the relationship between the curvature and the amount of strain is shown.
  • An example of the relationship between the torsion and the amount of strain is shown.
  • An example of the flow executed by the measuring device according to the present disclosure is shown.
  • An example of the distribution of the strain amount measured in step S101 is shown.
  • An example of the distribution of the strain change amount is shown.
  • An example of measuring the curvature and torsion at each point is shown.
  • An example of the relationship between the torsional curve and the amount of strain in the second embodiment is shown.
  • FIG. 1 shows an example of a tape core wire.
  • the tape core wire consists of a plurality of core wires 91-1 to 91-4, which are optical fiber strands, arranged in parallel and coated with resin.
  • core wires 91-1 to 91-4 are connected to each other by a coating. Therefore, the strain applied to each core wire 91-1 to 91-4 is equal for the displacement (bending) in the x-axis direction, but the core arranged inside for the rotation (twist) on the xy plane.
  • the core wires 91-1 and 91-4 arranged outside the wires 91-2 and 91-3 are more distorted. Further, due to the rigidity of the tape core wire, it can be assumed that the tape core wire does not bend in the y-axis direction and only bends or twists in the x-axis direction.
  • this disclosure is based on -The amount of increase in strain applied to each core wire 91-1 to 91-4, and-core wires 91-2 and 91-3 arranged inside and core wires 91-1 and 91-4 arranged outside.
  • the difference in the amount of strain applied to the tape core wire 91 is analyzed, and the curvature and torsion of the tape core wire 91 are calculated.
  • FIG. 2 shows an example of a system configuration according to the present disclosure.
  • the system according to the present disclosure includes a measuring device 10 and a tape core wire 91.
  • the tape core wire 91 is used as a sensor medium and is laid on the object to be measured 92 for shape sensing.
  • As the tape core wire 91 a general-purpose tape core wire in which four core wires are arranged can be used as shown in FIG.
  • the measuring device 10 includes an optical measuring instrument 11 that functions as a strain measuring unit, an arithmetic processing unit 12, and a storage unit 13.
  • the measuring device 10 can also be realized by a computer and a program, and the program can be recorded on a recording medium or provided through a network.
  • the optical measuring instrument 11 measures the strain of each core wire 91-1 to 91-4 included in the tape core wire 91.
  • the optical measuring instrument 11 is an arbitrary optical measuring instrument capable of measuring the strain distribution in the longitudinal direction of the optical fiber, and examples thereof include B-OTDR (Brillouin OTDR) and OFDR.
  • the arithmetic processing unit 12 measures the strain distribution of each core wire 91-1 to 91-4 using the strain measured by the optical measuring instrument 11, and calculates the curvature and torsion of the tape core wire 91 using this. do.
  • the storage unit 13 stores the relationship between the curvature and the strain amount and the relationship between the torsion ratio and the strain amount, which are measured in advance using the tape core wire 91.
  • FIG. 3 shows an example of the relationship between the curvature of the tape core wire 91 and the amount of strain.
  • the arithmetic processing unit 12 has the core wires 91-1 to 91-1 to Using at least one of the strain amounts of 91-4, the curvature corresponding to the strain amount can be derived.
  • FIG. 4 shows an example of the relationship between the torsional coefficient of the tape core wire 91 and the amount of strain.
  • the arithmetic processing unit 12 determines the core wires 91-1 to 91-. Using at least one of the strain amounts of 4, it is possible to derive the torsional curve according to the strain amount.
  • FIG. 5 shows an example of the flow executed by the measuring device according to the present disclosure.
  • the measuring device 10 executes steps S101 to S103.
  • S101 The optical measuring instrument 11 measures the strain distribution of each core wire 91-1 to 91-4.
  • S102 The arithmetic processing unit 12 compares the measured strain distribution with the strain reference data measured in advance, and calculates the distribution of the strain change amount of each core line 91-1 to 91-4.
  • S103 The curvature and torsion of the tape core wire 91 are calculated using the distribution of the strain change amount of each core wire 91-1 to 91-4.
  • FIG. 6 shows an example of the distribution of the strain amount measured in the procedure S101.
  • the optical measuring instrument 11 incidents signal light on the core wires 91-1 to 91-4, and uses the return light from the core wires 91-1 to 91-4 at each distance from the optical measuring instrument 11. Measure the amount of strain in.
  • the arithmetic processing unit 12 acquires the amount of distortion in each section S1 to S5.
  • step S102 the arithmetic processing unit 12 subtracts the strain distribution (distribution data when there is no distortion) as a reference measured in advance from the strain distribution of the strain measured in step S101, thereby distributing the amount of change in strain. Is calculated.
  • FIG. 7 shows an example of the distribution of the strain change amount.
  • the amount of strain on the inner core wires 91-2 and 91-3 and the amount of strain on the outer core wires 91-1 and 91-4 are substantially equal.
  • the strain amount of the outer core wires 91-1 and 91-4 is larger than the strain amount of the inner core wires 91-2 and 91-3. There is no increase in the amount of strain in the sections S1, S3, and S5.
  • the arithmetic processing unit 12 uses the “strain change amount” acquired in the procedure S102 and the “relationship between the curvature and the strain amount, and the relationship between the torsion rate and the strain amount” stored in the storage unit 13.
  • the distribution of the curvature and torsion of the tape core wire 91 at each point is calculated.
  • the arithmetic processing unit 12 derives the curvature according to the strain amount by using the relationship between the curvature and the strain amount as shown in FIG.
  • the amount of strain on the inner side and the amount of strain on the outer side are different.
  • the arithmetic processing unit 12 derives the twist ratio according to the strain amount by using the relationship between the twist ratio and the strain amount as shown in FIG. As a result, the curvature and torsional curve at each point can be measured from the optical measuring instrument 11 as shown in FIG.
  • Embodiment 2 In this embodiment, acquisition of the twisting direction will be described.
  • the system configuration of the present embodiment is the same as that of the first embodiment, and the optical measuring device 11 for measuring the strain distribution in the longitudinal direction of the optical fiber is used.
  • the tape core wire 91 is laid on the object to be measured 92 in a pre-twisted state.
  • the procedures S101 to S103 are executed in the same manner as in the first embodiment, but the procedure S103 is different in the following points.
  • the tape core wire 91 is twisted in advance. Therefore, as shown in FIG. 9, distortion is generated in advance. Therefore, when the amount of strain increases from the reference, the arithmetic processing unit 12 determines that the twist in the same direction as the twisted direction has been applied in advance. On the other hand, when the amount of strain is reduced from the reference, the arithmetic processing unit 12 determines that the twist in the direction opposite to the twisted direction has been applied in advance. As the amount of strain to be compared with the reference, the difference between the amount of strain generated in advance and the amount of strain on the outside may be used.
  • (Point of invention) -Use a general-purpose tape core wire as the sensor medium. -Measure the strain distribution in the longitudinal direction of each core wire by B-OTDR, OFDR, etc. -Calculate the curvature and torsion of the tape core wire from the difference in the amount of strain applied to the inner and outer optical fibers of the tape core wire. -It is assumed that due to the rigidity of the tape core wire, it does not bend in the y-axis direction and only bends or twists in the x-axis direction.
  • This disclosure can be applied to the information and communication industry.
  • Measuring device 11 Measuring device 11: Optical measuring instrument 12: Arithmetic processing unit 13: Storage unit 91: Tape core wire 91-1, 91-2, 91-3, 91-4: Core wire 92: Target to be measured

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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)
PCT/JP2020/009515 2020-03-05 2020-03-05 テープ心線を用いた測定装置及び測定方法 Ceased WO2021176667A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US17/798,172 US11788909B2 (en) 2020-03-05 2020-03-05 Measuring device and measuring method using tape core wire
PCT/JP2020/009515 WO2021176667A1 (ja) 2020-03-05 2020-03-05 テープ心線を用いた測定装置及び測定方法
JP2022504896A JP7306565B2 (ja) 2020-03-05 2020-03-05 テープ心線を用いた測定装置及び測定方法

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Application Number Priority Date Filing Date Title
PCT/JP2020/009515 WO2021176667A1 (ja) 2020-03-05 2020-03-05 テープ心線を用いた測定装置及び測定方法

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Cited By (3)

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JP2024037448A (ja) * 2022-09-07 2024-03-19 日本電信電話株式会社 構造物に加わる応力集中を検出可能にするシステム及び方法
EP4455617A4 (en) * 2021-12-24 2025-12-17 Ntt Inc FORM MEASURING SYSTEM AND FORM MEASURING METHOD
WO2026071175A1 (ja) * 2024-09-30 2026-04-02 古河電気工業株式会社 ケーブルの形状センシングシステムおよび電力ケーブル

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JP2001324358A (ja) * 2000-05-12 2001-11-22 Fujikura Ltd 光ファイバセンサ
JP2003028618A (ja) * 2001-07-10 2003-01-29 Fujikura Ltd 歪み検知用光ケーブルおよびこれを用いた歪み検知装置
JP2004517331A (ja) * 2001-01-11 2004-06-10 カナディアン・スペース・エージェンシー 位置形態及び運動測定ツール

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JP2001304822A (ja) * 2000-04-24 2001-10-31 Fujikura Ltd 光ファイバセンサおよび監視システム
JP2001324358A (ja) * 2000-05-12 2001-11-22 Fujikura Ltd 光ファイバセンサ
JP2004517331A (ja) * 2001-01-11 2004-06-10 カナディアン・スペース・エージェンシー 位置形態及び運動測定ツール
JP2003028618A (ja) * 2001-07-10 2003-01-29 Fujikura Ltd 歪み検知用光ケーブルおよびこれを用いた歪み検知装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4455617A4 (en) * 2021-12-24 2025-12-17 Ntt Inc FORM MEASURING SYSTEM AND FORM MEASURING METHOD
JP2024037448A (ja) * 2022-09-07 2024-03-19 日本電信電話株式会社 構造物に加わる応力集中を検出可能にするシステム及び方法
JP7810968B2 (ja) 2022-09-07 2026-02-04 Ｎｔｔ株式会社 構造物に加わる応力集中を検出可能にするシステム及び方法
WO2026071175A1 (ja) * 2024-09-30 2026-04-02 古河電気工業株式会社 ケーブルの形状センシングシステムおよび電力ケーブル

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US11788909B2 (en) 2023-10-17
US20230152170A1 (en) 2023-05-18
JPWO2021176667A1 (https=) 2021-09-10

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