KR101780703B1 - Fixation adhesive injection device for a tube mounted within the optical fiber sensor and method to mount fiber optic sensor in tube - Google Patents

Fixation adhesive injection device for a tube mounted within the optical fiber sensor and method to mount fiber optic sensor in tube Download PDF

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Publication number
KR101780703B1
KR101780703B1 KR1020150125843A KR20150125843A KR101780703B1 KR 101780703 B1 KR101780703 B1 KR 101780703B1 KR 1020150125843 A KR1020150125843 A KR 1020150125843A KR 20150125843 A KR20150125843 A KR 20150125843A KR 101780703 B1 KR101780703 B1 KR 101780703B1
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South Korea
Prior art keywords
optical fiber
tube
fiber sensor
housing
injection
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KR1020150125843A
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Korean (ko)
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KR20170029085A (en
Inventor
김재민
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전남대학교산학협력단
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00Measuring arrangements characterised by the use of optical techniques
    • G01B11/16Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05CAPPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05CAPPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C7/00Apparatus specially designed for applying liquid or other fluent material to the inside of hollow work
    • B05C7/02Apparatus specially designed for applying liquid or other fluent material to the inside of hollow work the liquid or other fluent material being projected
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00Processes for applying liquids or other fluent materials
    • B05D1/26Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Optical Transform (AREA)

Abstract

The present invention relates to a fixing material injecting apparatus for mounting an optical fiber sensor in a tube and a method of mounting an optical fiber sensor in the tube using the same, wherein the fixing material injecting apparatus for mounting an optical fiber sensor in the tube has a hollow The optical fiber sensor is inserted into the communication space so that the optical fiber sensor can be inserted into the hollow of the tube through the communication space. An injection unit installed in the housing and injecting a fixing material into the communication space; a plurality of optical fiber sensors, which are fixed to the optical fiber sensor so as to be spaced apart from each other in the longitudinal direction, and are inserted into the hollow of the tube together with the optical fiber sensor A plurality of injection members for forcibly transferring the fixing material in the communication space into the tube Respectively.
A fixing material injecting apparatus for mounting an optical fiber sensor in a tube and a method of mounting an optical fiber sensor in the tube using the same according to the present invention are characterized in that a plurality of injection members installed in an optical fiber sensor are fed into a tube together with an optical fiber sensor, The optical fiber sensor is firmly fixed to the tube by filling the hollow of the tube uniformly with the fixing material, thereby improving the accuracy of the measured value of the optical fiber sensor. In addition, since the fastening material can be rapidly filled into the hollow wire before the solidification of the fixture, the length of the composite strand can be remarkably increased.

Figure R1020150125843

Description

TECHNICAL FIELD The present invention relates to a fixation adhesive injection device for mounting an optical fiber sensor in a tube, and a method for mounting an optical fiber sensor in the tube using the fixture adhesive injection device.

The present invention relates to a fixing material injecting apparatus for mounting an optical fiber sensor in a tube and a method of mounting an optical fiber sensor in the tube using the same, and more particularly, to an optical fiber sensor capable of detecting deformation of a composite strand used in a concrete structure And a method of mounting an optical fiber sensor in a tube using the same.

Structures such as bridges, buildings, and dams, which are generally important social infrastructures, can suffer structural damage due to unexpected environmental changes such as earthquakes, typhoons, and floods, resulting in a significant decrease in life expectancy or collapse Lt; / RTI > Recently, a measurement system is being introduced to measure the strain of a structure in order to acquire the basic data necessary for determination of structural damage, deterioration degree, or structural problem.

In order to measure the strain, stress, etc. of the structure, a sensor such as Brillouin Optical Time Domain Reflectometry (BOTDR), Brillouin Optical Time Domain Analysis (BOTDA), photosensitivity sensor, interference optical fiber sensor And a fiber optic Bragg grating sensor are mainly used.

Korean Registered Utility Model No. 20-0350221 discloses an optical fiber sensor for tension measurement. Wherein the optical fiber sensor for tension measurement has a pair of optical fiber sensors in which both sides of the optical fiber sensor are integrally fixed by a fixing material while a pair of optical fiber sensors are inserted through the inside thereof, And a groove for fixing each of the amplifying units to the object to be measured in a stable manner.

However, since the optical fiber sensor for tension measurement is injected only through the open end of the fixing member, the fixing member is not uniformly filled in the fixing member, resulting in a disadvantage that the accuracy of the measured value is low.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a fixation material injection device for mounting an optical fiber sensor in a tube capable of uniformly filling a fixture into a tube of a composite strand, And the like.

In order to accomplish the above object, according to the present invention, there is provided an apparatus for injecting fixation material for mounting an optical fiber sensor in a tube, wherein a tube having a hollow therein is coupled to one end of the tube and a communication space communicating with the hollow of the tube is provided therein A housing having an inlet through which the optical fiber sensor is inserted into the communication space so that the optical fiber sensor can be inserted into the hollow of the tube through the communication space at the other end, and a fixing member installed in the housing to inject the fixing material into the communication space. A plurality of injection members fixed to the optical fiber sensor so as to be spaced apart from each other along the longitudinal direction and being drawn into the hollow of the tube together with the optical fiber sensor to forcibly feed the fixing material of the communication space into the tube, Respectively.

The injection member is formed to have an outer diameter corresponding to the inner diameter of the tube so as to prevent the backflow of the fixing material injected into the hollow of the tube.

According to another aspect of the present invention, there is provided a fixation material injection apparatus for mounting an optical fiber sensor in a tube, the fixation material injection apparatus being formed at the other end of the housing and extending in a direction away from the housing to guide the injection member into the housing, And may further include a guide portion formed to increase its inner diameter as it gets further away from the housing.

The injection member may include a pressure plate formed with a first through-hole through which the optical fiber sensor passes, an outer diameter corresponding to an inner diameter of the tube, And a fixing block fixed to the optical fiber sensor such that a front surface thereof is in close contact with a rear surface of the pressure plate.

Wherein the injection member includes a main tube having a second through-hole through which the optical fiber sensor passes, an extension plate extending in a direction in which an outer diameter of the end portion of the main tube is extended to contact an inner wall surface of the tube, A second extension skirt extending rearward from an edge of the extension plate with reference to an injection direction of the optical fiber sensor and an adhesive layer formed by applying an adhesive to the inner surface of the main pipe so that the main pipe can be adhered to the optical fiber sensor .

A method of mounting an optical fiber sensor in a tube according to the present invention comprises the steps of preparing a housing provided with a communication space in which a fixing material can be filled, A step of inserting the tube into the tube, a step of installing a connecting wire to penetrate the housing and the tube, a step of inserting the fixing material of the communication space into the tube when the optical fiber sensor is drawn into the tube, A plurality of injection members arranged along the longitudinal direction of the optical fiber sensor mounted on the inside of the tube so as to be able to carry the plurality of injection wires; A fixing step of fixing one end of the optical fiber sensor provided with the injection member; And a mounting step of applying a pulling force to the optical fiber sensor through the connecting wire so that the optical fiber sensor can be drawn into the tube through the housing do.

According to another aspect of the present invention, there is provided an optical fiber sensor comprising: a core having a predetermined length; an optical fiber body formed to surround an outer circumferential surface of the core; At least one pulling wire. ,

The pulling wire preferably extends longer than the length of the core so that an end portion of the pulling wire can protrude to the outside of the optical fiber body so that the pulling force can be applied by an operator.

A fixing material injecting apparatus for mounting an optical fiber sensor in a tube and a method of mounting an optical fiber sensor in the tube using the same according to the present invention are characterized in that a plurality of injection members installed in an optical fiber sensor are fed into a tube together with an optical fiber sensor, The optical fiber sensor can be firmly fixed to the tube by filling the hollow of the tube uniformly with the fixing material, thereby improving the accuracy of the measured value of the optical fiber sensor and increasing the production length of the composite stranded wire compared to the conventional manufacturing method .

1 is a side view showing a bridge in which a composite strand having an optical fiber sensor is installed,
FIG. 2 is a partially cutaway perspective view of a superposed wedge with the optical fiber sensor of FIG. 1,
3 is a perspective view of a fixing material injection apparatus for mounting an optical fiber sensor in a tube according to the present invention,
4 is a perspective view of a fixing material injection apparatus for mounting an optical fiber sensor in a tube according to another embodiment of the present invention,
5 is a perspective view of a fixing material injection apparatus for mounting an optical fiber sensor in a tube according to another embodiment of the present invention,
6 is a partially cutaway perspective view of an optical fiber sensor according to the present invention.

Hereinafter, a fixing material injecting apparatus for mounting an optical fiber sensor in a tube according to the present invention and a method for mounting an optical fiber sensor in the tube using the same will be described in detail with reference to the accompanying drawings.

FIG. 1 and FIG. 2 show a composite strand mounted with a tube manufactured by a fixing material injecting apparatus for mounting an optical fiber sensor in a tube according to the present invention.

Referring to the drawing, a composite strand is installed in a composite strand or a concrete structure installed in a bridge 15, and includes a tube 20 provided with a hollow 21 extending in the longitudinal direction thereof, A plurality of unit strands 30 interlaced with the tube 20 and coupled to the tube 20, an optical fiber sensor 40 installed in the hollow 21 of the tube 20, (50) to be injected into the hollow (21) so as to fix the support member (40).

The tube 20 constitutes the core of a composite strand, and a hollow 21 is formed therein to penetrate the strand in the longitudinal direction.

The optical fiber sensor 40 may be an optical fiber cable for strain measurement for strain measurement by BOTDR or BOTDA, and an optical fiber Bragg grating sensor in which a grating portion is formed at a predetermined interval in the optical fiber. The Bragg grating optical fiber sensor 40 uses the property that a wavelength component corresponding to the Bragg condition is reflected by the grating sensing part and the rest of the wavelength component passes through when the light is irradiated to the optical fiber by the light source. The light can be measured by a photodetector (not shown) to measure changes in various physical quantities. The Bragg wavelength, which is the wavelength of the light reflected by the grating sensing unit, is a function of the effective refractive index and the lattice spacing. When the interval of the grating sensing unit is changed by an external physical quantity such as temperature or load, the Bragg wavelength, (Temperature, strain) applied to the grating sensing unit can be calculated by precisely measuring the change of the Bragg wavelength.

On the other hand, Brillouin Optical Time Domain Reflectometry (BOTDR) has a Brillouin frequency as its own property, and Brillouin frequency changes or shifts depending on the strain or temperature applied to the optical fiber do. The BOTDR unit senses the Brillouin frequency shift, which varies with the deformation or temperature acting on the fiber from the outside. In other words, since the Brillouin frequency of the optical fiber shifts, that is, the Brillouin frequency is shifted according to the deformation or temperature acting from the outside, the magnitude of the rear scattered light changes, so that the magnitude and the physical quantity externally acting by the Brillouin frequency shift One point can be grasped.

The Brillouin optical time domain analysis (BOTDA) is a measurement method using Brillouin scattering with varying frequency of scattered light. Since it is a distributed optical fiber sensor system, physical quantities around the optical fiber can be measured at every position of a single optical fiber. Brillouin scattering is a phenomenon in which light interacts with a sound generated in a material and scatters at a frequency different from the frequency of the incident light. Such a frequency change is called Brillouin frequency change. This frequency change depends not only on the material of the optical fiber but also on the strain applied to the optical fiber and the ambient temperature.

BOTDA arranges a pulse light source and a CW light source at both ends of the measured optical fiber, and receives pulse light at one end of the optical fiber and CW light at the other end of the optical fiber. At this time, if the optical frequency of the pulsed light source and the CW light source are adjusted so that the frequency difference between the pulsed light frequency and the CW light frequency coincides with the intrinsic Brillouin transition frequency of the measured optical fiber, the pulsed light is converted into CW light by the stimulated Brillouin scattering And the CW light is subjected to Brillouin optical amplification in the measured optical fiber. That is, if the frequency difference between the pulsed light and the CW light is brought close to the original Brillouin transition frequency of the optical fiber, induced Brillouin scattering occurs. The optical fiber Brillouin transition frequency has a characteristic of fluctuating according to an external physical quantity, that is, a strain or a temperature. Therefore, if an external influence is applied to a specific position of the optical fiber, the induced Brillouin scattering at that position has different values. In addition, since pulse light is used, the scattered light signal after the return is analyzed temporally, so that the deformation information of the optical fiber can be known.

The fixture 50 is for fixing the optical fiber sensor 40 to the tube 20 so that the strain of the tube 20 can be transmitted to the optical fiber sensor 40 as it is. ) Is used.

3, a fixing material injecting apparatus 100 for mounting an optical fiber sensor in a tube according to the present invention includes a tube 20 having a hollow 21 therein at its front end, And the optical fiber sensor 40 is inserted into the hollow 21 of the tube 20 through the communication space 111 at the rear end thereof. A housing 110 in which an inlet 112 into which the optical fiber sensor 40 is inserted is formed in a communication space 111 and a fixing material 50 installed in the housing 110 to inject the fixing material 50 into the communication space 111 The optical fiber sensor 40 is fixed to the optical fiber sensor 40 so as to be spaced apart from each other in the longitudinal direction and is inserted into the hollow 21 of the tube 20 together with the optical fiber sensor 40, And a plurality of injection members 130 for forcibly transferring the fixing material 50 of the tube 20 into the tube 20.

The housing 110 extends in the front-rear direction and is formed into a cylindrical shape having a communicating space 111 therein. The communication space 111 extends in the front-rear direction and is formed to have an inner diameter corresponding to the inner diameter of the tube 20. [ The housing 110 is communicated with the communication space 111 at the front end to prevent a step from being generated between the communication space 111 and the hollow 21 of the tube 20 when the tube 20 is connected A mounting hole 113 having an inner diameter corresponding to the outer diameter of the tube 20 is formed.

Although not shown in the drawings, the housing 110 may be formed with a female screw thread on the inner circumferential surface of the mounting hole 113 so as to fit into the male thread formed on the end of the tube 20.

The housing 110 has a connecting pipe 114 communicating with the communication space 111 on the outer circumferential surface thereof. An inlet 112 is formed in a rear end surface of the housing 110. A guide portion 115 is formed at the rear end of the housing 110 to guide the injection member 130 into the housing 110 Respectively.

The guide portion 115 extends rearward in a direction away from the housing 110 and is formed so that the inner diameter increases as the distance from the housing 110 increases. The injection member 130 moved together with the optical fiber sensor 40 flows into the communication space 111 of the housing 110 by the guide portion 115. [

The injection unit 120 includes a storage tank 121 filled with a large amount of a fixing material 50 therein and a supply pipe 122 connected to the connection pipe 114 between the storage tank 121 and the housing 110, A supply pump 123 installed in the supply pipe 122 for pumping the fixing material 50 accommodated in the accommodation tank 121 into the housing 110 and a supply pump 122 installed in the supply pipe 122, And a control unit 125 connected to the open / close valve 124 and the supply pump 123 to control the open / close valve 124 and the supply pump 123.

The control unit 125 controls the opening / closing valve 124 to operate the supply pump 123 so that the supply pipe 122 is opened when an operator inputs a work start signal through an input panel (not shown). When the worker inputs a work end signal through the input panel, the operator controls the open / close valve 124 so that the supply pipe 122 is closed, and stops the supply pump 123.

A plurality of injection members 130 are installed on the optical fiber sensor 40 so as to be spaced apart from each other along the longitudinal direction. The injection member 130 prevents the backflow of the fixing material 50 injected into the hollow 21 of the tube 20 and prevents the backflow of the fixing material 50 in the hollow space 21 of the communication space 111 and the tube 20 And is formed to have an outer diameter corresponding to the inner diameter of the tube 20 so that the fixing material 50 can be forcedly transferred. Further, the injection member 130 is preferably formed of a material such as rubber having predetermined elasticity.

4, an injection member 140 according to another embodiment of the present invention is shown.

Elements having the same functions as those in the previous drawings are denoted by the same reference numerals.

Referring to the drawing, the injection member 140 has a first through hole 144 through which the optical fiber sensor 40 passes, a pressure plate 141 formed to have an outer diameter corresponding to the inner diameter of the tube 20, A first extended skirt 142 extending rearward from an edge of the pressure plate 141 with respect to an injection direction of the optical fiber sensor 40 and a second extended skirt 142 extending from the optical fiber sensor 141 so that a front surface thereof is in close contact with a rear surface of the pressure plate 141. [ And a fixed block (143) fixed to the frame (40).

The first through hole 144 is formed at the center of the pressure plate 141 so that the first through hole 144 has an inner diameter corresponding to the outer diameter of the optical fiber sensor 40. Preferably, the pressure plate 141 is formed in a disc shape having an outer diameter corresponding to the inner diameter of the tube 20.

The first extension skirt 142 extends rearward with respect to the pressure plate 141 so that the outer circumferential surface thereof contacts the inner surface of the tube 20 and is formed in an annular shape along the edge of the pressure plate 141. The first extension skirt 142 is fixedly attached to the inner surface of the tube 20 so as to prevent the outer shape of the pressure plate 141 from being deformed by the internal pressure of the fixing material 50 .

The above-described pressure plate 141 and the first extension skirt 142 are preferably made of a rubber-like material having a predetermined elasticity.

The fixed block 143 extends a predetermined length along the longitudinal direction of the optical fiber sensor 40 and has an insertion port formed at a central portion thereof to allow the optical fiber sensor 40 to pass therethrough. The insertion port is passed through the fixing block 143 along the front-rear direction, and an adhesive is preferably applied to the inner surface. The fixing block 143 is provided on the rear side of the pressure plate 141 to firmly support the pressure plate 141 against the optical fiber sensor 40 so as to prevent the pressure plate 141 from being pushed rearward.

5, an injection member 150 according to another embodiment of the present invention is shown.

Referring to the drawing, the injection member 150 includes a main pipe 151 having a second through-hole through which the optical fiber sensor 40 penetrates, and a main pipe 151 having an end connected to the inner wall surface of the tube 20. An extension plate 152 extending in a direction in which an outer diameter of the tube 151 extends to an end of the tube 151; a second extension 152 extending rearward from the edge of the extension plate 152 with respect to an injection direction of the optical fiber sensor 40; A skirt 153 and an adhesive layer 154 formed by applying an adhesive to the inner surface of the main pipe 151 so that the main pipe 151 can be adhered to the optical fiber sensor 40.

The main pipe 151 extends a predetermined length along the longitudinal direction of the optical fiber sensor 40, and the second through-hole is formed at the center. The second through-hole may be formed to penetrate the main tube 151 in the front-rear direction and have an inner diameter corresponding to the outer diameter of the optical fiber sensor 40.

The extension plate 152 extends in a direction in which the outer diameter of the main pipe 151 extends. At this time, the extension plate 152 is formed in a disk shape having an outer diameter corresponding to the inner diameter of the tube 20 so that the fixing material 50 can be forcedly transferred inside the tube 20.

The second extending skirt 153 extends rearward with respect to the extending plate 152 so that the outer peripheral surface thereof contacts the inner surface of the tube 20 and is formed annular along the edge of the extending plate 152. The second extending skirt 153 is provided with an extension plate 152 on the inner surface of the tube 20 so as to prevent the outer shape of the extension plate 152 from being deformed by the internal pressure of the fixing material 50 Strongly supported.

The operator inserts the optical fiber sensor 40 into the second through hole of the main tube 151 and moves the main tube 151 to a predetermined position of the injection member 150. Next, the adhesive may be cured for a predetermined period of time to fix the injection member 150 to the optical fiber sensor 40.

A method of mounting the optical fiber sensor 40 in the tube using the fixing material injection apparatus 100 according to the present invention constructed as described above will be described in detail as follows.

A method for mounting an optical fiber sensor in a tube according to the present invention includes a preparation step, a tube installation step, a wire installation step, a injection member installation step, a fixing step, an injection step, and a mounting step.

The preparation step is a step of preparing the housing 110 provided with the communication space 111 in which the fixing material 50 can be filled.

The tube installation step is to install the tube 20 at one end of the housing 110 so that the hollow 21 of the tube 20 communicates with the communication space 111. The operator inserts the end of the tube 20 into the mounting hole 113 provided at the rear end of the housing 110 to connect the tube 20 to the housing 110.

The wire installation step is a step of installing a connection wire (not shown) so as to penetrate through the housing 110 and the tube 20. The connection wire is preferably longer than the sum of the lengths of the tube 20 and the housing 110.

The injection member may be installed in the tube 20 so as to force the fixing material 50 of the communication space 111 into the tube 20 when the optical fiber sensor 40 enters the tube 20. [ A plurality of injection members 130 are installed along the longitudinal direction of the optical fiber sensor 40 mounted inside the optical fiber sensor 40.

The fixing step is a step of fixing the front end of the optical fiber sensor 40 provided with the injection member 130 to the rear end of the connection wire protruding through the inlet 112 formed at the rear end of the housing 110. The operator can fasten the connection wire to the front end portion of the optical fiber sensor 40. [

The injecting step is a step of injecting the fixing material 50 into the communication space 111 of the housing 110 where the fixing step is completed. When the worker inputs the operation start signal through the input panel of the controller 125, the controller 125 controls the opening / closing valve 124 to open the supply pipe 122 and operates the supply pump 123.

The mounting step is a step of applying a pulling force to the optical fiber sensor 40 through the connecting wire so that the optical fiber sensor 40 can be drawn into the tube 20 through the housing 110. [ The operator grasps the connecting wire protruding from the front end of the tube 20 and pulls it forward. When the pulling force is applied to the connecting wire, the fixing member 50 inside the housing 110 is pushed by the injection member 130 passing through the housing 110 together with the optical fiber sensor 40 into the tube 20, (20).

The method for mounting the optical fiber sensor 40 in the tube 20 according to the present invention and the optical fiber sensor 40 in the tube 20 using the optical fiber sensor 40, 40 are forced into the tube 20 together with the optical fiber sensor 40 to force the fixing material 50 to be transferred to the hollow 21 of the tube 20 uniformly 50) to securely fix the optical fiber sensor to the tube 20, thereby improving the accuracy of the measured value of the optical fiber sensor.

6 shows an optical fiber sensor 160 used in a method of mounting an optical fiber sensor in a tube according to the present invention.

The optical fiber sensor 160 includes an optical fiber body 161 having a core 163 extended in a predetermined length and a clad 164 surrounding the outer circumference of the core 163, And at least one pulling wire 162 extending in the longitudinal direction of the core 163 and fixed to the clad 164 so as to be moved together with the core 163. [

The core 163 extends along the front-rear direction by a predetermined length, and a plurality of lattice-sensing portions are etched with a predetermined width along the longitudinal direction. The lattice detection unit is formed by a conventional method of forming ultraviolet rays through a mask corresponding to a preset lattice spacing and a lattice width.

The clad 164 is formed so as to surround the outer circumferential surface of the core 163 and extends a predetermined length along the longitudinal direction of the core 163. At this time, it is preferable that the clad 164 is formed to have a lower refractive index than the core 163. The optical fiber body 161 further includes an outer coating layer 165 formed to surround the outer circumferential surface of the clad 164. The outer coating layer 165 is preferably formed of a synthetic resin having a predetermined strength and excellent moldability.

The pulling wire 162 extends along the longitudinal direction of the core 163 and extends in the longitudinal direction of the core 163 so that an end portion of the pulling wire 162 can protrude to the outside of the optical fiber body 161 It is preferable to extend longer than the length. At this time, the pulling wire 162 has a predetermined strength and is formed of a synthetic resin material such as flexible nylon.

In the illustrated example, the structure in which the two pulling wires 162 are installed on the clad 164 at positions opposite to each other with respect to the core 163 is shown. However, the number of the pulling wires 162 and the mounting positions thereof But may be installed at a plurality of positions and at various positions depending on the length and size of the optical fiber sensor 160.

The operator applies a pulling force to the optical fiber sensor 160 by connecting the coupling wire to the pulling wire 162 or by grasping the pulling wire 162. Therefore, since the pulling force is applied to the pulling wire 162 as well as the pulling force is not directly applied to the clad 164 and the core 163, the pulling force causes the core 163 and the clad 164 to be damaged or defective . In addition, since the optical fiber sensor 160 can be drawn into the tube 20 quickly with a larger force, time required for mounting the optical fiber sensor 160 on the tube 20 can be saved, .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art.

Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

100: Fixing material injection device for mounting an optical fiber sensor in a tube
110: Housing
111: communicating space
112: Inlet
113: Mounting hole
114: Connector
115: guide portion
120: injection unit
121: Storage tank
122: supply pipe
123: Feed pump
124: opening / closing valve
125:
130: injection member

Claims (8)

And a communication space communicating with the hollow of the tube is provided at one end and a tube provided with a hollow inside at one end thereof is provided and the communication space is provided at the other end of the tube so that the optical fiber sensor can be inserted into the hollow of the tube through the communication space. A housing having an inlet through which the optical fiber sensor is inserted into the space;
An injection unit installed in the housing and injecting a fixing material into the communication space;
And a plurality of injection members fixed to the optical fiber sensor so as to be spaced apart from each other along the longitudinal direction and being forced into the hollow of the tube together with the optical fiber sensor to forcibly feed the fixing material of the communication space into the tube A fixation material injection device for mounting an optical fiber sensor in a tube.
The method according to claim 1,
Wherein the injection member is formed to have an outer diameter corresponding to an inner diameter of the tube so as to prevent a backflow of the fixing material injected into the hollow of the tube.
3. The method according to claim 1 or 2,
And a guide portion formed at the other end of the housing and extending in a direction away from the housing so as to guide the injection member into the housing, wherein the guide portion is formed so that the inner diameter increases with distance from the housing A fixation material injection device for mounting an optical fiber sensor in a tube.
The method according to claim 1,
The injection member
A pressure plate formed to have a first through-hole through which the optical fiber sensor passes, an outer diameter corresponding to an inner diameter of the tube,
A first extending skirt extending rearward from an edge of the pressing plate with respect to an injection direction of the optical fiber sensor,
And a fixing block fixed to the optical fiber sensor such that a front surface thereof is in close contact with a rear surface of the pressure plate.
The method according to claim 1,
The injection member
A main tube having a second through-hole through which the optical fiber sensor passes,
An extension plate extending in a direction in which an outer diameter of the main tube extends to an end of the main tube so that an end thereof abuts an inner wall surface of the tube;
A second extension skirt extending rearward from an edge of the extension plate with respect to an injection direction of the optical fiber sensor,
And an adhesive layer formed by applying an adhesive to an inner surface of the main tube so that the main tube can be adhered to the optical fiber sensor.
A preparation step of preparing a housing provided with a communication space in which a fixing material can be filled;
A tube installing step of installing the tube at one end of the housing so that a hollow of the tube communicates with the communication space;
A wire installation step of installing a connection wire through the housing and the tube;
A plurality of injection members are provided along the longitudinal direction of the optical fiber sensor so that the fixing material in the communication space can be forcedly transferred into the tube when the optical fiber sensor is drawn into the tube;
A fixing step of fixing one end of the optical fiber sensor provided with the injection member to one end of the connection wire projected through an inlet formed at the other end of the housing;
An injection step of injecting a fixing material into the communication space of the housing when the fixing step is completed;
And applying a pulling force to the optical fiber sensor through the connecting wire so that the optical fiber sensor can be drawn into the tube through the housing.
The optical fiber sensor according to claim 6, wherein the optical fiber sensor
An optical fiber body provided with a clad extending around the outer circumferential surface of the core;
And at least one pulling wire fixed to the clad so as to be movable together with the optical fiber body and extending in the longitudinal direction of the core.
8. The method of claim 7,
Wherein the pulling wire extends longer than a length of the core so that an end portion of the pulling wire can protrude out of the optical fiber body so that the pulling force can be applied by an operator.
KR1020150125843A 2015-09-04 2015-09-04 Fixation adhesive injection device for a tube mounted within the optical fiber sensor and method to mount fiber optic sensor in tube KR101780703B1 (en)

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KR102197696B1 (en) * 2019-12-24 2021-01-04 한국건설기술연구원 Structure health monitoring system using optic fiber-based hybrid nerve network sensor, and method for the same

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JP2004309981A (en) 2003-04-10 2004-11-04 Sumitomo Electric Ind Ltd Waterproof terminal structure for optical cable
JP2005076388A (en) 2003-09-03 2005-03-24 Tokyo Seiko Co Ltd Terminal fixing method and terminal fixing body of high strength fiber composite material cable

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
JP2004309981A (en) 2003-04-10 2004-11-04 Sumitomo Electric Ind Ltd Waterproof terminal structure for optical cable
JP2005076388A (en) 2003-09-03 2005-03-24 Tokyo Seiko Co Ltd Terminal fixing method and terminal fixing body of high strength fiber composite material cable

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102197696B1 (en) * 2019-12-24 2021-01-04 한국건설기술연구원 Structure health monitoring system using optic fiber-based hybrid nerve network sensor, and method for the same

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