KR101165085B1

KR101165085B1 - Grip and optical fiber sensor using the same, measuring method using the optical fiber sensor

Info

Publication number: KR101165085B1
Application number: KR1020100003820A
Authority: KR
Inventors: 김우영; 장기태
Original assignee: (주)지엠지
Priority date: 2010-01-15
Filing date: 2010-01-15
Publication date: 2012-07-12
Also published as: KR20110083861A

Abstract

The present invention relates to a grip fixed to an elongate member such as an optical fiber, a tension member, rebar, a wire, a rope, an optical fiber sensor using the same, and a measuring method thereof. In particular, the present invention is the sleeve 10 in close contact with the outer surface of one side of the elongate member (4); And at least one socket 20 fixed to an outer side of the sleeve 10 so that the sleeve 10 can be pressed against the elongate member 4, wherein the sleeve 10 and the socket ( 20 each includes a plurality of members disposed along the circumferential direction (arrow C) of the elongate member 4 to surround the elongate member 4, and the plurality of members of the socket 20 are detached from each other. Provided are a grip 2 and an optical fiber sensor using the same, characterized in that they are integrally coupled as possible, and a measuring method thereof.

Description

GRIP AND OPTICAL FIBER SENSOR}, GRIP AND OPTICAL FIBER SENSOR USING THE SAME, MEASURING METHOD USING THE OPTICAL FIBER SENSOR}

The present invention relates to a grip fixed to an elongate member such as an optical fiber, a tension member, rebar, a wire, a rope, an optical fiber sensor using the same, and a measuring method thereof.

In general, the grip is intended to be settled to grab elongated members such as optical fibers, cables, tension members, rebars, wires, and ropes, which are widely used in various fields such as measurement, telecommunication, construction, and civil engineering. .

By such a grip, the elongate member can be pressed to impart an initial displacement or tension force, the elongate member can be fixed to the ground or a structure, or two elongate members can be joined.

By the way, when the grip is fixed to the end of the elongate member, it is not a problem, but when the grip is fixed to the inner side of the elongated member, such as a long length, the grip is inserted straight from the end of the elongate member to the fixing position. It is necessary to move, and due to the friction between the grip and the elongate member, the grip is not easy to settle, may take a long time, there is a problem that the grip or elongate member may be worn or damaged.

The present invention has been made in order to solve the above problems, instead of the method of fixing the grip by inserting the grip at the end of the elongate member, the grip to be fixed to the elongate member directly from the fixing position and using the same An object thereof is to provide an optical fiber sensor and a measuring method thereof.

The present invention in order to solve the above problems is the sleeve 10 in close contact with the outer surface of one side of the elongate member (4); And at least one socket 20 fixed to an outer side of the sleeve 10 so that the sleeve 10 can be pressed against the elongate member 4, wherein the sleeve 10 and the socket ( 20 each includes a plurality of members disposed along the circumferential direction (arrow C) of the elongate member 4 to surround the elongate member 4, and the plurality of members of the socket 20 are detached from each other. A grip 2 is characterized in that it is integrally coupled as possible.

The plurality of members of the sleeve 10 may be formed such that there is a gap 10G in at least one portion along the circumferential direction (arrow C) of the elongate member 4.

The sleeve (10) has a threaded portion (11) formed on at least a portion of its outer circumferential surface; The socket 20 may have a threaded portion 21 corresponding to the threaded portion 11 of the sleeve 10 so that the socket 20 may be screwed with the sleeve 10.

A cavity 26 may be formed on the inner circumferential surface of the socket 20 in the screwing direction of the socket 20 with respect to the sleeve 10, behind the threaded portion of the socket 20.

At least a portion of the outer circumferential surface of the sleeve 10 increases in outer diameter along the engagement direction of the socket 20 along the longitudinal direction (arrow L) of the elongate member 4 with respect to the sleeve 10. Formed with a tapered surface 18; At least a portion of the inner circumferential surface of the socket 20 may be formed as a tapered surface 28 corresponding to the tapered surface 18 of the sleeve 10.

On the outer surface of the sleeve 10, the barrier portion 12 may protrude to a portion other than the fixing portion of the socket 20.

At least one groove 12A may be formed in the barrier part 12.

Concave and convex portions 22 and 24 may be formed so that the plurality of members of the socket 20 may be fitted to each other along the longitudinal direction (arrow L) of the elongated member 4.

At least a portion of the outer circumferential surface of the socket 20 may be formed in a plane.

A plurality of sockets 20 may be fixed to the one sleeve 10 along the longitudinal direction (arrow L) of the elongate member 4.

In addition, the present invention to solve the above problems is the optical fiber sensing unit (4) is the elongate member (4); And a grip (2) according to any one of claims 1 to 10 fixed to at least one of the optical fiber sensing unit (4) to impart tension to the optical fiber sensing unit (4). present.

In addition, the present invention to solve the above problems is a measuring method using the optical fiber sensor, the installation step of installing the optical fiber sensor; A reference setting step of setting initial displacement generating points (P1, P2, P3) of the optical fiber sensing unit (4) to which tension is applied by the grip (2) after the installation step; A deformation detection step of detecting a deformation of the optical fiber sensing unit 4 after the setting step; Deformation position analysis step of analyzing the deformation position of the optical fiber sensing unit 4 on the basis of the initial displacement generating point (P1, P2, P3) when the deformation of the optical fiber sensing unit 4 is detected. It provides a measurement method using an optical fiber sensor, characterized in that.

In addition, in order to solve the above problems, the present invention provides a measuring method using the optical fiber sensor, the installation step of installing the optical fiber sensor provided so that the optical fiber sensing unit 4 can be tensioned by a plurality of grips (2) ; A setting step of setting an initial displacement S1 of each section G1, G2, G3, G4 of the optical fiber sensing unit 4 partitioned by the plurality of grips 2; A deformation detection step of detecting a deformation of the optical fiber sensing unit 4 after the setting step; A strain calculation step of calculating strains of respective sections G1, G2, G3, and G4 of the optical fiber sensing unit 4 based on the initial displacement S1 when the deformation of the optical fiber sensing unit 4 is detected; It provides a measurement method using the optical fiber sensor, characterized in that it comprises a.

The setting step includes setting initial displacement point (P1, P2, P3) of the optical fiber sensing unit (4) to which tension is applied by the grip (2); In the strain calculating step, the strain position of the optical fiber sensing unit 4 may be analyzed together based on the initial displacement generating points P1, P2, and P3.

In the present invention, since the grip can be fixed directly to the fixing position of the elongate member, the fixing operation of the grip can be easily and quickly made, and the grip and the elongate member can be eliminated because the interference and the friction of the grip and the elongate member can be excluded. Wear and damage can be prevented.

1 to 6 relate to a grip according to the invention,
1 is a perspective view.
2 is an exploded perspective view.
3 is a cross-sectional view taken along line AA of FIG. 1.
4 is an enlarged view of a portion 'C' of FIG. 3.
5 is a cross-sectional view taken along line BB of FIG. 1.
6a to 6c is a schematic diagram of the fixing process of the grip.
7 is a schematic diagram showing an example of an optical fiber sensor using a grip according to the present invention.
8 is an initial displacement graph of the optical fiber sensor of FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1 or below, the grip 2 according to the present invention basically has a sleeve 10 that is in close contact with an outer surface of one side of an elongated elongate member 4, and a sleeve 10. It may be configured to include at least one socket (20) (socket) is fixed to the outside of the sleeve 10 so that it can be compressed to the elongate member (4).

Here, the sleeve 10 and the socket 20 are each configured to include a plurality of members disposed along the circumferential direction (arrow C) of the elongate member 4 to surround the elongate member 4. can do. For convenience of description, the member of the sleeve 10 is called a sleeve member 10A, and the member of the socket 20 is called a socket member 20A.

That is, the plurality of sleeve members 10A and the plurality of socket members 20A are combined with each other along the circumferential direction (arrow C) of the elongated member 4 directly at the fixing portion of the elongated member 4, thereby providing a ring. It may form a ring to surround the elongate member 4.

Therefore, the sleeve 10 and the socket 20 are elongated member 4 because the sleeve 10 and the socket 20 can be directly fixed to the fixing portion of the elongated member 4 at the time of fixing the grip (2). Since the process of being inserted and moved from the end of the) can be omitted, the fixing operation of the grip 2 can be easily and quickly achieved.

In addition, since the sleeve 10 and the socket 20 are inserted and moved from the end of the elongate member 4, the sleeve 10 and the socket 20 are rubbed with the elongate member 4 and are not interfered with, so that the grip 2 at the time of fixing the grip 2 ( 2) and the elongate member 4 can be obtained the effect that there is no fear of wear and damage.

In particular, when the elongated member 4 is an optical fiber sensing unit made of an optical fiber, as described below, the outer skin is fragile, so that the outer skin can be easily damaged by friction and interference with the grip 2, and thus, the optical fiber sensor When measuring, noise and errors may occur a lot, and in more serious cases, measurement may be impossible due to breakage of the optical fiber sensing unit. The grip 2 according to the present invention does not need to worry about the above problems.

The sleeve 10 and the grip 2 for constituting such a grip 2 will be described in more detail as follows.

The plurality of sleeve members 10A may be configured to be integrally coupled to each other, but may be firmly and stably fixed to the elongated member 4 by the socket 20, and are not integrally coupled to each other as shown. It may be taken without a structure.

In the latter case, a separate element and operation for integrally coupling the plurality of sleeve members 10A are omitted, so that the structure of the sleeve 10 can be very simple, and the fixing work of the sleeve 10 is easy. Can be taken more.

In particular, in the latter case, the plurality of sleeve members 10A may be formed such that there is a gap 10G in at least one portion along the circumferential direction (arrow C) of the elongate member 4.

That is, the circumferential length of the elongate member 4 is smaller than the total circumferential length of the plurality of sleeve members 10A, and the elongate member 4 is press-fitted into a tube smaller than the cross-sectional size of the elongate member 4. As it is, the sleeve 10 can be fixed while sufficiently pressing the elongate member 4. Thus, the grip 2 according to the present invention can further take advantage of being able to form a sufficient fixing force.

Meanwhile, the sleeve 10 may be formed such that one socket 20 is fixed to one sleeve 10 or two or more sockets 20 may be fixed as shown.

In addition, the outer surface of the sleeve 10 may be formed in the portion other than the fixing portion of the socket 20, the barrier portion 12 protrudes to be thicker than the fixing portion of the socket 20.

The barrier part 12 may serve as a handle. That is, after fixing the sleeve 10 to the elongate member 4 first, the worker directly attaches the barrier 12 or sets the socket 20 in a state where the tool is bitten by the barrier 12. Since the sleeve 10 can be maintained in the elongate member 4 even before the fixing of the 20, and the socket 20 can be fixed without interfering with the operator's hand or tool, the grip 2 Taking advantage of that the fixing operation can be made easily.

In addition, the barrier part 12 may serve as a stopper to allow the socket 20 to be fixed only to the fixing portion of the sleeve 10, and thus may further take advantage of that overassembly of the socket 20 may be prevented. .

At least one groove 12A may be formed in the barrier part 12 so that the tool can be bitten better.

Meanwhile, one or more socket fixing parts of the sleeve 10 may be provided depending on the number of sockets 20 fixed to the sleeve 10. However, the elongate member as shown so that the grip 2 is more firmly and stably fixed to the elongate member 4 and sufficient fixing force can be given to the elongate member 4 by the grip 2. The sleeve 10 may be formed to be provided with a plurality of socket fixing portions so that the plurality of sockets 20 may be fixed to one sleeve 10 along the longitudinal direction (arrow L) of (4).

The plurality of socket members 20A may be separated from each other for ease of fixation and release of the grip 2, but may maintain a ring shape during fixing of the grip 2 for a firm and stable fixation of the grip 2. It is preferably configured to be integrally coupled to each other so as to be detachable.

To this end, the plurality of socket members 20A may be coupled to each other in various ways. Above all, it is more advantageous in terms of structural simplification, ease of detachment, etc. to have the uneven parts 22 and 24 to be fitted along the longitudinal direction (arrow L) of the elongate member 4 as shown. can do. Here, it is preferable that the plurality of socket members 20A are fitted together in a direction corresponding to the longitudinal direction (arrow L) of the elongate member 4 as described above in order to maintain the state in which the plurality of socket members 20A are integrally coupled to each other. . The uneven parts 22 and 24 may be formed of the grooves 22 and the protrusions 24 as shown, and may be variously configured in addition to the grooves 22 and 24.

On the other hand, at least a portion of the outer circumferential surface of the socket 20 is formed in a plane, the operator's hand or tool can be securely and firmly mounted.

The sleeve 10 and the socket 20 may be coupled to each other in various ways, but as shown in the drawing, the method of screwing simplifies the structure of the grip 2 and facilitates the fixing of the grip 2, and the grip ( 2) It can be said to be more advantageous in terms of stability, solidity and fixing.

That is, the sleeve 10 has a threaded portion 11 formed on at least a portion of its outer circumferential surface, that is, the socket fixing portion, and the socket 10 may be screwed with the sleeve 10 on at least a portion of the inner circumferential surface thereof. Thread portion 21 corresponding to the threaded portion 11 of the) may be formed.

In addition, a cavity 26 is formed on the inner circumferential surface of the socket 20 further in the screwing direction of the socket 20 with respect to the sleeve 10, behind the threaded portion 21 of the socket 20. You can do

That is, even if the screwing of the socket 20 and the sleeve 10 is overassembled by the cavity 26 as shown by the dotted line in FIG. 4, the threaded portion 11 of the sleeve 10 is the threaded portion of the socket 20. It can be prevented to get stuck on the inner peripheral surface other than. Therefore, even if the socket 20 and the sleeve 10 are overassembled, the screw 20 of the socket 20 and the sleeve 10 can be easily loosened when the grip 2 is unsettled, and the damage of the socket 20 is prevented. It can be further taken advantage of.

The cavity 26 of the socket 20 may be more preferably formed in the shape of a ring-shaped groove over the entire circumference of the inner circumferential surface of the socket 20.

In addition, the socket 20 and the sleeve 20 may be prevented from being overassembled in the sleeve 10 and the socket 20, and the socket 20 may be pressed against the sleeve 10 to press the sleeve 10 to form a sufficient fixing force. 10 may be configured as follows.

That is, the sleeve 10 is a taper in which at least a portion of its outer peripheral surface increases in its outer diameter along the fastening direction of the socket 20 along the longitudinal direction (arrow L) of the elongate member 4 with respect to the sleeve 10. Formed with face 18. The socket 20 may be formed as a tapered surface 28 at least a portion of the inner circumferential surface thereof corresponds to the tapered surface 18 of the sleeve 10.

The fixing process of the grip 2 will be described with reference to FIGS. 6A to 6C.

First, as shown in FIG. 6A, the plurality of sleeve members 10A are closely attached to the outside of the elongate member 4 so that the elongate member 4 is surrounded by the sleeve 10.

Next, as shown in FIG. 6B, a plurality of socket members 20A are assembled around the elongate member 4 so that the socket 20 is fitted to the outside of the elongate member 4 simultaneously with the assembly. To be. Then, the socket 20 assembled as shown in FIG. 6C is engaged with the sleeve 10 surrounding the elongated member 4.

Then, the grip 2 is fixed to the elongate member 4, and the grip fixing portion of the elongate member 4 is relatively deformed by being given a predetermined tension force by the grip 2.

On the other hand, using the grip 2 according to the present invention can be configured as an optical fiber sensor as follows. See, in particular, FIGS. 7 and 8.

That is, the optical fiber sensor may be configured by fixing at least one grip 2 on the outside of the optical fiber sensing unit 4 made of an optical fiber as the elongate member 4.

Here, the optical fiber refers to a thin fiber having a diameter of about 0.1 mm formed so that the refractive index of light is high inside and low outside, so that total reflection optical phenomenon occurs inside the fiber.

In order to reduce light loss when transmitting light using the above phenomenon, highly transparent material is required, and high purity quartz or polymer material having excellent optical properties is used.

The structure has a double cylinder shape in which a core called a core is wrapped around a portion called cladding. On the outside, one or two coats of synthetic resin are applied to protect against impact.

The total size excluding the protective coating is 100 to several hundred μm in diameter (1 μm is 1/1000 mm), and the refractive index of the core portion is higher than the refractive index of the cladding, so that the light can be focused on the core portion and proceed without exiting well. have.

Optical fiber is mainly used in the field of communication, but when the optical fiber is stretched by temperature and pressure, the temperature and pressure can be measured by detecting an interference pattern of light passing through the optical fiber. Therefore, the sensor utilizing this is called an optical fiber sensor.

Recently, various attempts have been made to utilize such optical fiber sensors in the field of construction measurement, and in detail, measurement of displacement (sag, deformation) of the substrate 1 such as the ground and the structure due to pressure change, and temperature change Such as leak detection.

In addition, in the optical fiber sensor according to the present invention, as described above, the optical fiber sensing unit 4 is provided with a tension force by fixing the grip 2, as shown in FIGS. 7 and 8. (4) Initial displacement (hereinafter referred to as 'initial displacement occurrence point (P1, P2, P3)' for the deviation of explanation) S2 'is generated.

Therefore, by the initial displacement generation point (P1, P2, P3), the measurement by the optical fiber sensor can be made more accurately.

That is, the measuring method using the optical fiber sensor according to the present invention, the installation step of installing the optical fiber sensor in the parent (1), and the optical fiber sensing unit 4 is given a tension force by the grip (2) after the installation step The reference setting step of setting the initial displacement generating point (P1, P2, P3) of the step, the deformation detection step of detecting the self-deformation of the optical fiber sensing unit 4 after the setting step, and the self-deformation of the optical fiber sensing unit 4 And a strain position analysis step of analyzing the strain position of the optical fiber sensing unit 4 based on the initial displacement generating points P1, P2, and P3 when detected.

Accordingly, the optical fiber sensing unit 4 may be divided into a plurality of sections G1, G2, G3, and G4 based on the initial displacement generating points P1, P2, and P3. When the self deformation of the portion 4 occurs, the generation period of the self deformation of the optical fiber sensing unit 4 can be quickly detected. By using this, the deformation position or the temperature change position of the mother body 1 can be quickly and accurately measured.

In addition, in the optical fiber sensor according to the present invention, as described above, the plurality of grips 2 are fixed to the optical fiber sensing unit 4, and the angles of the optical fiber sensing unit 4 between the grip 2 and the grip 2 are fixed. The sections G1, G2, G3, and G4 may be installed to be tense.

By providing the optical fiber sensor in this way, the measurement can be made by the following measurement method.

That is, in the measuring method according to the present invention, an installation step of installing the optical fiber sensor in the mother body 1, and each section G1, G2, G3, of the optical fiber sensing unit 4 partitioned by the plurality of grips 2, The setting step of setting the initial displacement (S1) of G4), the deformation detection step of detecting the self-deformation of the optical fiber sensing unit 4 after the setting step, and if the self-deformation of the optical fiber sensing unit 4 is detected, the initial displacement ( Hereinafter, a strain calculation step of calculating strains of respective sections G1, G2, G3, and G4 of the optical fiber sensing unit 4 on the basis of the 'section initial displacement S1' for the sake of explanation. Can be configured.

Therefore, when the deformation of the optical fiber sensing unit 4 is detected, an accurate strain may be calculated based on the initial displacement S1.

Further, by setting the above-described initial displacement generating points P1, P2, and P3 and position analysis using the same, it is possible to measure not only accurate strain rate but also accurate strain position.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It is to be understood that both the technical idea and the technical spirit of the invention are included in the scope of the present invention.

2; Grip 4; Elongated member
10; Sleeve 10A; Sleeve member
12; Barrier 20; socket
20A; Socket member 26; public

Claims

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An installation step of installing an optical fiber sensor including an optical fiber sensing unit 4 provided with a tension force by fixing the grip 2 as an elongate member on which the grip 2 is fixed, and after the installation step, the grip 2 A reference setting step of setting the initial displacement generating points (P1, P2, P3) of the optical fiber sensing unit 4 is applied by the tension force, and detects the self deformation of the optical fiber sensing unit 4 after the setting step Deformation detection step and the deformation position for analyzing the self-deformation position of the optical fiber sensing unit 4 on the basis of the initial displacement generating point (P1, P2, P3) when the deformation of the optical fiber sensing unit 4 is detected An analysis step;
The grip 2 is a sleeve 10 in close contact with the outer surface of one side of the optical fiber sensing unit 4 and the sleeve 10 so that the sleeve 10 can be pressed against the optical fiber sensing unit 4 that is the elongate member At least one socket 20 anchored to the outside of the sleeve 10;
The sleeve 10 and the socket 20 each include a plurality of members disposed along the circumferential direction (arrow C) of the optical fiber sensing unit 4 to surround the optical fiber sensing unit 4, and the sleeve ( The plurality of members of 10 are formed to have a space 10G in at least one portion along the circumferential direction (arrow C) of the optical fiber sensing unit 4, and the plurality of members of the socket 20 are detachable from each other. United integrally;
On the outer circumferential surface of the sleeve 10, a screw portion 11 is formed at the fixing portion of the socket 20, and the barrier portion 12 is formed at a portion other than the fixing portion of the socket 20, and the socket 20 is formed. At least a portion of the inner peripheral surface of the measuring method using a fiber sensor, characterized in that the threaded portion corresponding to the threaded portion (11) of the sleeve (10) is formed to be screwed with the sleeve (10).

An installation step of installing an optical fiber sensor including an optical fiber sensing unit 4 provided with a tension force by fixing the plurality of grips 2 as an elongate member on which a plurality of grips 2 are fixed, and the plurality of grips A setting step of setting an initial displacement S1 of each section G1, G2, G3, G4 of the optical fiber sensing unit 4 partitioned by (2), and after the setting step, Deformation sensing step of detecting the self-deformation, and each section (G1, G2, G3, G4) of the optical fiber sensing unit 4 based on the initial displacement (S1) when the self-deformation of the optical fiber sensing unit 4 is detected A strain calculating step of calculating strain of
The grip 2 is a sleeve 10 in close contact with the outer surface of one side of the optical fiber sensing unit 4 and the sleeve 10 so that the sleeve 10 can be pressed against the optical fiber sensing unit 4 that is the elongate member At least one socket 20 anchored to the outside of the sleeve 10;
The sleeve 10 and the socket 20 each include a plurality of members disposed along the circumferential direction (arrow C) of the optical fiber sensing unit 4 to surround the optical fiber sensing unit 4, and the sleeve ( The plurality of members of 10 are formed to have a space 10G in at least one portion along the circumferential direction (arrow C) of the optical fiber sensing unit 4, and the plurality of members of the socket 20 are detachable from each other. United integrally;
On the outer circumferential surface of the sleeve 10, a screw portion 11 is formed at the fixing portion of the socket 20, and the barrier portion 12 is formed at a portion other than the fixing portion of the socket 20, and the socket 20 is formed. At least a portion of the inner peripheral surface of the measuring method using a fiber sensor, characterized in that the threaded portion corresponding to the threaded portion (11) of the sleeve (10) is formed to be screwed with the sleeve (10).

The method according to claim 13,
The setting step includes setting initial displacement point (P1, P2, P3) of the optical fiber sensing unit (4) to which tension is applied by the grip (2);
The strain calculation step, the measurement method using an optical fiber sensor, characterized in that for analyzing the self-deformation position of the optical fiber sensing unit (4) based on the initial displacement generating point (P1, P2, P3).