KR20120010296A - A fixing structure of FBG sensor and it's prosedure - Google Patents

A fixing structure of FBG sensor and it's prosedure Download PDF

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Publication number
KR20120010296A
KR20120010296A KR1020100071715A KR20100071715A KR20120010296A KR 20120010296 A KR20120010296 A KR 20120010296A KR 1020100071715 A KR1020100071715 A KR 1020100071715A KR 20100071715 A KR20100071715 A KR 20100071715A KR 20120010296 A KR20120010296 A KR 20120010296A
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KR
South Korea
Prior art keywords
optical fiber
sensor
groove
fixing
fiber grating
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Application number
KR1020100071715A
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Korean (ko)
Inventor
전진용
Original Assignee
(주)지티씨코퍼레이션
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Priority to KR1020100071715A priority Critical patent/KR20120010296A/en
Publication of KR20120010296A publication Critical patent/KR20120010296A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/483—Reactive adhesives, e.g. chemically curing adhesives
    • B29C65/4845—Radiation curing adhesives, e.g. UV light curing adhesives
    • 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
    • G01B11/165—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by means of a grating deformed by the object
    • 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
    • G01L1/246—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 using integrated gratings, e.g. Bragg gratings

Abstract

The present invention relates to an optical fiber grating sensor fixing method and a fixing structure that can be fixed within a short time when the optical fiber grating sensor is fixed to the fixture of the sensor device, the production efficiency is excellent, accurate sensing action, a pair of fixtures (10 The uniform groove 11-1 is formed on the upper surface of the body 11, and the optical fiber lattice sensor 9 is temporarily fixed in the uniform groove 11-1 of each body 11 in a tensioned state to provide a UV adhesive ( 30 is filled or fixed, or formed on the upper surface of the body 12 of the pair of fasteners 10 to form a mid-low groove 12-1 with a deep center and shallow both ends, and a medium-low groove of each body 12 The groove part 22 of the fixing member 20 which temporarily fixes the optical fiber lattice sensor 9 in the tensioned state to fill the UV adhesive 30 or fixes the optical fiber lattice sensor 9 to the 12-1. It is characterized in that it is configured to fix the optical fiber lattice sensor (9) by filling the UV adhesive (30) in the Shall be.

Description

A fixing structure of FBG sensor and it's prosedure}

The present invention relates to a method for fixing an optical fiber grating sensor and a fixing structure thereof, and more particularly, when an optical fiber grating sensor is fixed to a fixture of a sensor device, the optical fiber grating sensor can be fixed in a short time and has an excellent production efficiency and enables accurate sensing. It relates to a grating sensor fixing method and its fixing structure.

The fiber optic sensor is not corroded, so it has high durability, is not affected by electromagnetic waves, and can be multiplexed.

Various measuring sensors are used to analyze the safety of buildings and other structures, but the use of fiber optic sensors is gradually increasing as a replacement for conventional measuring systems. As the optical fiber constituting the optical fiber sensor as shown in FIG. 1, the core (Fiber Core, 2) and cladding (3) having different refractive indices so that the incident light is totally reflected, and the jacket (4) for protecting the core and the cladding It is usually composed of.

The optical fiber sensor using the optical fiber 1 may be classified into one point, distribution, and multiple types according to the measurement range.

In other words, the one-point type optical fiber sensor is simple to measure the change amount of strain, temperature and pressure of the part where the optical fiber sensor is mounted, but it is necessary to mount the optical fiber sensor to various parts when the target is applied to a plurality of parts. There may be some limitations.

ODTR (Optical Time Domain Reflectometry) is a typical example of a distributed optical fiber sensor. This has the advantage that it is useful to measure the overall behavior of the structure using a single optical fiber.

Multi-type fiber optic sensor is a type in which two or more single-point optical fiber sensors are installed in one optical fiber sensor, which corresponds to an FBG sensor (Fiber Bragg Grating Sensor).

The FBG sensor generates a grating by inducing a change in refractive index by periodically scanning a laser in the ultraviolet region to a Ge-doped optical fiber core, as shown in FIG. 2, and generates a grating. It is an optical device that reflects light. When the broadband spectrum is incident on the optical fiber, the wavelength component satisfying the condition is reflected on the optical fiber grating, and the remaining wavelength component passes through and appears in the optical spectrum analyzer.

In addition, the FBG sensor is composed of germanium-silica glass, which is not affected by electromagnetic waves at all, and has a physical advantage that corrosion by moisture or moisture does not occur.

In addition, the FBG sensor has the advantage of installing several Bragg gratings on one strand of optical fiber and installing several sensing units on one strand of optical fiber, and the optical fiber has a very small transmission loss of 0.2 dB per km. This allows the fiber to extend up to tens of kilometers. Since there is little loss of the light source, the FBG sensor has a great advantage to be applied to very long structures such as bridges, railways, rails and pipelines.

Due to these excellent characteristics, the FBG sensor can solve various shortcomings of the conventional electrical resistive sensor, and can measure minute strain and temperature of the structure, and thus has been spotlighted as an alternative to the conventional measuring device.

The optical fiber 1 is generally penetrated and fixed through the fixture 7, which is such that the optical fiber 1 is strained by a strain bar, or loosely installed so that strain changes such as tension and compression and The temperature change can be measured, and in order to control the micro tension, in particular, the micro adjustment screw is installed in the protective tube.

The optical fiber is coated with a covering jacket of about 245 ~ 250 ㎛ because of the risk of its own breakage, mostly acrylate coating. The coated jacket has the advantage of protecting the optical fiber, but if it is directly attached to the coated jacket surface and the test specimen without partially peeling the optical fiber, slippage occurs between the jacket and the cladding to accurately measure the tensile behavior and the behavior against long-term deformation due to the tensile force. It becomes impossible to do.

In order to measure the exact physical deformation of the object, the cladding part of the object and the optical fiber grating sensor must be fixedly attached. For this purpose, the acrylic coating of the fiber grating sensor at the attachment point must be peeled off. However, at this time, the optical fiber sensor of the stripped part is generally lower in strength than the optical fiber sensor of the other part, and when deformation occurs, the stripped part is easily broken or difficult to attach the optical fiber sensor to the sensor package.

In order to prevent the slip phenomenon generated in this way using a fastener (7) as shown in Figures 4 and 5, this fastener (7) is a through hole 7 penetrating the front and rear ends of the body (7-1) -3) is formed, the optical fiber 1 passes through the through hole 7-3, and the optical fiber 1 is fixed with an adhesive agent. At this time, the epoxy is fixed through the filling hole (7-2) formed in the body (7-1). When the optical fiber is fixed to the fixture as described above, the acrylic coating part is prevented from slipping when the fixing part is deformed, and the fixture 7 has an effect of protecting the stripped portion and reinforcing strength.

However, when the optical fiber is fixed to the fixture (7) using an instant adhesive such as epoxy, it is difficult to contact air in the through hole (7-3) of the fixture (7). In the case of the instant adhesive, when it is stored, it has a liquidity with a low molecular weight compound, and when it comes into contact with air, a polymerization reaction is caused by moisture in the air to solidify and adhere to a high molecular compound. It takes a long time to be satisfied enough to solidify.

It takes a lot of time to manufacture because the optical fiber is fixed to the fixture 7 to be left for about 6 hours or more, and it is difficult to form the precise through hole 7-3 and the filling hole 7-2 in the fixture 7. There was a point.

The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a method for easily fixing an optical fiber grating sensor to a fixture, and to provide a fixing structure thereof.

The fiber optic grating sensor is completed to be attached in a short time to increase productivity, and to configure the fiber grating sensor to be stably fixed.

The present invention is a structure for fixing the optical fiber grating sensor in the sensor device using the optical fiber grating sensor to achieve the above object,

In the state in which the uniform groove 11-1 is formed on the upper surface of the body 11 of the pair of fixtures 10, and the optical fiber lattice sensor 9 is tensioned in the uniform groove 11-1 of each body 11, respectively. It is characterized in that the fixed by filling the UV adhesive 30 by temporarily fixing, or forming a medium-low groove 12-1 deep in the center and shallow both ends at the upper surface of the body 12 of the pair of fasteners 10, respectively The fiber optic lattice sensor 9 is temporarily fixed to the mid-low groove 12-1 of the body 12 in a tensioned state, and is fixed by filling the UV adhesive 30, or the optical fiber lattice sensor 9 is fixed. The optical fiber grating sensor fixing structure, characterized in that configured to fix the optical fiber grating sensor (9) by filling the UV adhesive 30 in the groove portion 22 of the fixing member 20 to be fixed as a whole. And a groove forming step (S10) of forming a groove in the longitudinal direction on the upper surface of the body of the fixture (10). Inserting the optical fiber grating sensor into the groove part, and temporarily inserting the optical fiber after fixing the groove part so that both ends of the optical fiber grating sensor are fixed in the tensioned state (S20); A UV adhesive groove filling step (S30) of filling the UV adhesive with the optical fiber grating sensor inserted into the temporarily fixed groove; UV irradiation step (S40) to irradiate the UV adhesive filled within 20 seconds; A fixture installation step of fixing the fixture fixed to the optical fiber lattice sensor to the optical fiber sensor package according to the corresponding measurement part and direction of the measurement object (S50); It provides an optical fiber grating sensor fixing method comprising a.

As described above, the present invention can fix the optical fiber grating sensor to the fixture within a few seconds or several minutes, there is an effect that can be produced in a short time, the fixing process is not only simple, but also has the effect of easy manufacturing of the fixture.

1 is a view showing a conventional optical fiber.
2 is a view schematically showing a FBG structure of a conventional optical fiber.
3 is a view showing a conventional optical fiber sensor structure.
Figure 4 is a perspective view showing a conventional optical fiber grating sensor fixture.
Figure 5 is a cross-sectional view showing a conventional optical fiber grating sensor fixture.
Figure 6 is a perspective view showing a fixed structure of the optical fiber grating sensor of the present invention.
7 is a perspective view showing another embodiment of the optical fiber grating sensor fixing structure of the present invention.
8 is a perspective view showing another embodiment of the optical fiber grating sensor fixing structure of the present invention.
9 is a flowchart illustrating a method for fixing an optical fiber grating sensor according to the present invention.

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to the accompanying drawings. In describing the present invention, the term or word used in the present specification and claims is based on the principle that the inventor can appropriately define the concept of the term in order to best describe the invention of his or her own. It should be interpreted as meanings and concepts corresponding to the technical idea of

The present invention relates to a structure for fixing the optical fiber grating sensor 9 in the sensor device (S) using the optical fiber grating sensor (9), the uniform groove 11-1 on the upper surface of the body 11 of the pair of fasteners (10) ). In addition, the optical fiber grating sensor 9 is temporarily fixed to the uniform groove 11-1 of each body 11 in the tensioned state to fill the UV adhesive 30 to irradiate UV. The rectangular body 11 is easy to manufacture, and the uniform groove 11-1 on the upper surface thereof is a groove having an open upper portion, and is formed to have the same depth.

The optical fiber is composed of a core, cladding, and a jacket, which is a coating protecting the core and cladding, and light is transmitted from the core and the cladding, and the material constituting the glass is glass. The transmission of light (light) is transmitted through the glassy core portion having a high refractive index, and the glassy cladding portion having a low refractive index serves to prevent the loss of light transmitted to the core portion.

As described above, since the core part and the cladding part made of glass are vulnerable to external impacts, the core part and the cladding part are protected by a covering jacket such as polymer or acrylate.

As described above, an optical fiber grating sensor generates an optical fiber grating by periodically inducing a refractive index change by periodically scanning a laser in an ultraviolet region to an optical fiber core, and is an optical device that reflects light of a specific wavelength determined by the gap of the grating. When light reaches the grating, wavelength components satisfying certain conditions are reflected from the optical fiber grating, and the remaining wavelength components pass through and appear in the optical spectrum analyzer. Accordingly, when the distance between the gratings is changed by the deformation of the fiber grating sensor, the reflected wavelength is changed by the difference.

This sensitive fiber optic sensor does not strip part of the optical fiber and attaches directly to the coated jacket surface and the test specimen, causing slippage between the catch and the cladding, making it impossible to accurately measure the tensile and long-term deformation due to the tensile force. The coated jacket with the acrylic lake coating protecting the cladding was partially peeled off and then attached to the portion to be measured.

As a result of the test for verifying the slip phenomenon of the fixed optical fiber sensor with respect to the structure in which the optical fiber grating sensor 9 is fixed to the fixture 10 of the present invention, strain of 1,000 micro strain is applied to the package without adding the prestrain to the package. We tried to verify the slip phenomenon that occurs when applying a step and maintaining it for up to 20 minutes in stages.

In the fastener of the present invention, not only the slip phenomenon occurs in the 8000 micro strain, but also the optical fiber grating sensor can be fixed within a few minutes, resulting in a drastic shortening of production time.

Looking at another embodiment of the present invention, as shown in Figure 7, on the upper surface of the body 12 of the pair of fasteners 10 to form a mid-lower groove 12-1 having a deep center and both ends are shallow, The optical fiber lattice sensor 9 is temporarily fixed to the mid-low groove 12-1 of the body 12 in a tensioned state.

In this state, the UV adhesive 30 is filled and irradiated with UV for a few seconds to be cured and fixed. The UV adhesive 30 is an adhesive that is cured by ultraviolet rays and then cures in a few seconds when irradiated with ultraviolet rays. Therefore, since both the uniform groove 11-1 of FIG. 6, the middle low groove 12-1 of FIG. 7, and the groove 22 of FIG. 8 are open at the top, they are easily cured as the ultraviolet rays are irradiated. The sensor 9 is fixed.

In FIG. 8, the optical fiber grating sensor 9 fills the UV adhesive 30 in the groove part 22 of the fixing member 20 which fixes the optical fiber lattice sensor 9 to the fixing member 20 as a whole. 9).

As described above, the optical fiber grating sensor 9 is fixed to the fixture 10 or the fixing member 20 through the following steps as shown in FIG. 9.

First, the groove portion forming step (S10) to form a groove in the longitudinal direction on the upper surface of the body of the fixture (10). In this step, the fixture 10 may be formed of a rectangular body 11 or another body 12 may be formed as shown in FIG. 7. The body 12 means a shape other than a rectangle, and may be formed in other shapes. If only the low-mid groove 12-1 is formed on the upper surface of the body 12 will satisfy the configuration of the present invention.

The mid-low groove 12-1 of the body 12 is preferably formed in a structure that holds the optical fiber 1 at both sides by forming a deep center and a shallow shape at both sides. Mid-low groove type 12-1 is filled with a lot of adhesive in the center can be a more firm fixing.

Then, after the insertion of the grooves go through the optical fiber temporary fixing step (S20), in this step is inserted into the optical fiber grating sensor 9, and temporarily fixed to both ends of the optical fiber grating sensor is fixed in a tensioned state. The optical fiber grating sensor 9 is placed in each of the grooves of the fixture 10 or the fixing member 20 (the uniform grooves 11-1, the mid-low grooves 12-1, and the grooves 22 collectively referred to as grooves). Strain it at both ends while inserting it, pull it out with proper force, and fix it temporarily. The tensioned state of such an optical fiber is sufficient to pull it with an appropriate tension, and the tension value is not particularly limited.

The next step is to go through the UV adhesive groove filling step (S30), in which the optical fiber grating sensor (9) is inserted and temporarily fixed in the groove (common name groove) of the fixture 10 or the fixing member 20 is fixed Fill the adhesive 30.

UV adhesive 30 is commercially available in a variety of products, one of these products can be selected and used.

The UV adhesive filled in the UV irradiation step (S40) is irradiated with UV within 20 seconds to cure the UV adhesive 30 to fix the optical fiber grating sensor (9).

UV irradiation toward the filled UV adhesive 30 is cured, and the time for irradiating the UV adhesive filled with the ultraviolet ray is within about 20 seconds.

Finally, in the fixture installation step (S50), the fixture 10 or the spherical member 20 to which the optical fiber grating sensor 9 is fixed is fixed to the optical fiber sensor package according to the corresponding measuring part and direction of the measurement object. The fixing means is to be applied to the fixing means of the existing sensor device (S).

1: fiber optic 2: core
3: cladding 4: jacket
5: optical fiber lattice 6: optical fiber sensor package
7: Fixture 7-1: Body
7-2: Filling hole 7-3: Through hole
8: measuring plate 9: fiber optic grating sensor
10: fixture 11: body
11-1: uniform groove 12: body
12-1: medium and low groove 20: fixing member
21 body 22 groove
30: UV adhesive
S10: groove forming step
S20: Temporary fixation of optical fiber after inserting groove
S30: UV adhesive groove filling step
S40: UV irradiation step
S50: Fixture installation step
S: Sensor device

Claims (4)

In the structure of fixing the optical fiber grating sensor in the sensor device using the optical fiber grating sensor,
In the state in which the uniform groove 11-1 is formed on the upper surface of the body 11 of the pair of fixtures 10, and the optical fiber lattice sensor 9 is tensioned in the uniform groove 11-1 of each body 11, respectively. Fixing structure of the optical fiber grating sensor, characterized in that the temporarily fixed by filling the UV adhesive (30).
In the structure of fixing the optical fiber grating sensor in the sensor device using the optical fiber grating sensor,
On the upper surface of the body 12 of the pair of fasteners 10, a middle low groove 12-1 having a deep center and shallow end portions is formed, and an optical fiber lattice is formed in the medium low groove 12-1 of each body 12. Fixing structure of the optical fiber grating sensor, characterized in that the sensor 9 is temporarily fixed in the tensioned state to fill the UV adhesive (30).
In the structure of fixing the optical fiber grating sensor in the sensor device using the optical fiber grating sensor,
The optical fiber grating sensor fixing structure, characterized in that configured to fix the optical fiber lattice sensor (9) by filling the UV adhesive 30 in the groove portion 22 of the fixing member (20) for fixing the optical fiber lattice sensor (9) as a whole.
Groove forming step (S10) for forming a groove in the longitudinal direction on the upper surface of the body of the fixture (10);
Inserting the optical fiber grating sensor into the groove part, and temporarily inserting the optical fiber after fixing the groove part so that both ends of the optical fiber grating sensor are fixed in the tensioned state (S20);
A UV adhesive groove filling step (S30) of filling the UV adhesive with the optical fiber grating sensor inserted into the temporarily fixed groove;
UV irradiation step (S40) to irradiate the UV adhesive filled within 20 seconds;
A fixture installation step of fixing the fixture fixed to the optical fiber lattice sensor to the optical fiber sensor package according to the corresponding measurement part and direction of the measurement object (S50); Fiber optic grating sensor fixing method comprising a.
KR1020100071715A 2010-07-26 2010-07-26 A fixing structure of FBG sensor and it's prosedure KR20120010296A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200117415A (en) 2019-04-04 2020-10-14 (주)에프비지코리아 Optical fiber fixing method and measuring device using the same
WO2021241778A1 (en) 2020-05-28 2021-12-02 (주)에프비지코리아 Optical fiber fixing method and measurement apparatus using same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200117415A (en) 2019-04-04 2020-10-14 (주)에프비지코리아 Optical fiber fixing method and measuring device using the same
WO2021241778A1 (en) 2020-05-28 2021-12-02 (주)에프비지코리아 Optical fiber fixing method and measurement apparatus using same
US20220314554A1 (en) * 2020-05-28 2022-10-06 Fbg Korea Inc. Method of fixing optical fiber and measuring apparatus using the same
EP3943991A4 (en) * 2020-05-28 2022-11-30 FBG Korea Inc. Optical fiber fixing method and measurement apparatus using same

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