CN108680289A - A kind of method that polyurethane encapsulation fiber grating prepares sensor - Google Patents
A kind of method that polyurethane encapsulation fiber grating prepares sensor Download PDFInfo
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- CN108680289A CN108680289A CN201810530864.2A CN201810530864A CN108680289A CN 108680289 A CN108680289 A CN 108680289A CN 201810530864 A CN201810530864 A CN 201810530864A CN 108680289 A CN108680289 A CN 108680289A
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- 239000000835 fiber Substances 0.000 title claims abstract description 73
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 24
- 239000004814 polyurethane Substances 0.000 title claims abstract description 24
- 238000005538 encapsulation Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 20
- 230000001681 protective effect Effects 0.000 claims abstract description 17
- 239000011248 coating agent Substances 0.000 claims abstract description 8
- 238000000576 coating method Methods 0.000 claims abstract description 8
- 238000007711 solidification Methods 0.000 claims abstract description 6
- 230000008023 solidification Effects 0.000 claims abstract description 6
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 4
- 239000013307 optical fiber Substances 0.000 claims description 15
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920003225 polyurethane elastomer Polymers 0.000 abstract description 5
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 230000008859 change Effects 0.000 abstract description 4
- 238000004891 communication Methods 0.000 abstract description 3
- 238000004806 packaging method and process Methods 0.000 abstract description 3
- 238000001035 drying Methods 0.000 abstract 1
- 238000012544 monitoring process Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- PXFBZOLANLWPMH-UHFFFAOYSA-N 16-Epiaffinine Natural products C1C(C2=CC=CC=C2N2)=C2C(=O)CC2C(=CC)CN(C)C1C2CO PXFBZOLANLWPMH-UHFFFAOYSA-N 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 206010068052 Mosaicism Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 210000003765 sex chromosome Anatomy 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical compound FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
The method that a kind of polyurethane encapsulation fiber grating prepares sensor belongs to fiber optic communication and light level technical field, and this method is using polyurethane as encapsulating material, and steps are as follows：First, encapsulating mould is fixed in fiber platform, the coating for peelling off grating region penetrates capillary tubing, and bare fibre is fixed in fiber platform with fixture, and guarantee is placed in mold axis center；Secondly, upper protective case is covered from the both ends of bare fibre successively；Finally, the mold that polyurethane is poured into advance coated releasing agent is put into vacuum tank drying, solidification.Fiber grating and the fibre core for removing coat are all encapsulated with polyurethane elastomer, protect it from the incompatible problem of different materials.Packaging method of the present invention is simple, reliable, portable, and the sensor being prepared can be monitored it by equipping the change of stress, temperature etc., can be suitble to a variety of industrial occasions applications；Light grating stability, reliability and the sensitivity of encapsulation are all significantly improved.
Description
Technical field
The invention belongs to fiber optic communications and light level technical field, are related to a kind of polyurethane encapsulation fiber grating preparation biography
The method of sensor, the stress variation for monitoring marine settings component.
Background technology
Light grating development in recent years is extremely rapid, is played more and more in the related fields such as fiber optic communication and light level
Important role.It is the sensor for sensing primitive and making, the resonance wavelength and light of optical fiber Bragg raster with optical fiber Bragg raster
The period of grid is related with the effective refractive index of mould, when these variables change because of the variation of extraneous factor, resonance wavelength
Offset will be generated, the offset by measuring resonance wavelength can measure the variation of external physical quantity indirectly, such as：Strain, stress, temperature
Degree, pressure and some chemical quantities.Optical fiber Bragg raster has small, light-weight, electromagnetism interference, long codes, can realize
Distributed sensing is convenient for the advantages that large-scale production, is attracted wide public concern in field of sensing technologies.Fiber grating is due to upper
Advantage is stated, thus just there is advantage in sensory field and be applied.
Currently, fiber grating is mainly used in the safety detection in terms of oil, chemical industry, civil construction, aerospace and mixed
Coagulate the safeguard construction monitoring etc. of soil.Wu Zhanjun etc. monitors Fatigue Damage of Laminated Composites process with fiber grating；The use such as Li Hongnan
The solidification process of FBG monitoring composite material；LiSun et al. is prepared into stress sensing with epoxy encapsulation fiber grating
Device etc.；The Ho in Hong Kong etc. has studied the dynamic and static weighing of structure with light line grating, and obtains the resolution ratio etc. of 2.6 μ ε.
Currently, the application of internal optical fiber Bragg grating sensors includes not only the Gernral Check-up of large scale civil engineering, corrosion
Monitoring, composite material solidification monitoring, the also monitoring on marine hull and platform.Fiber Bragg Grating Strain Sensor device exists
Restriction is received in practical engineering application, first, optical fiber Bragg raster is manufactured on the single-mode quartz optical fibers for removing coat, it is easy to break
It is disconnected；Second is that the temperature of environment and the variation of strain lead to Prague centre wavelength drift, generation temperature is intersected quick with strain
Sense problem, when strain measurement, must take temperature-compensating measure；Third, the working environment rather harsh of sensor, usually perishable
It loses, under moist environment, short life, it cannot be guaranteed that long-term work.Therefore, fiber grating need to be packaged to protect, is protected
Card sensor can survive and be worked normally in severe working environment.
The tubulose of existing encapsulation technology generally use organic polymer and metal-coating encapsulates, and in practical engineering application
In, reliability, stability and sensitivity are all extremely difficult to actual engine request；Simultaneously also without eliminating temperature to light light
The influence of the centre wavelength of grid, there are certain errors for measured value.
Invention content
The technology of the present invention solves the problems, such as：Overcome the deficiencies in the prior art proposes a kind of high molecular material encapsulation light
The technique of line grating specifically provides a kind of method that polyurethane encapsulation fiber grating prepares sensor, using polyurethane elastomer
Packaging FBG fiber grating is applied to as strain transducer in marine engineering equipment, the stress for monitoring marine settings component
Variation；Fiber Stability, reliability and the sensitivity encapsulated using polyurethane elastomer material is all significantly improved.
In order to achieve the above object, the technical scheme is that：
A kind of method that polyurethane encapsulation fiber grating prepares sensor, using polyurethane as encapsulating material, including with
Lower step：
The first step keeps flat encapsulating mould 1 to fiber platform 2.The advance coated releasing agent of encapsulating mould 4, described is special
It is rectangular configuration with encapsulating mould 1, " dumbbell shaped " cavity is equipped in encapsulating mould 1, cavity both ends is rectangular parallelepiped structure, and centre is logical
Meticulous elongate configuration connection.
The cavity both ends a length of 20mm of cuboid, width 12mm, a height of 6mm, centre are long 40mm, wide 3mm, height
The connection strap of 3mm, there are the threading holes of long 5mm, diameter 4mm apart from die edge for cavity, and 1 material of encapsulating mould is poly-
Tetrafluoroethene, high temperature resistant.
Second step, takes one section of bare fibre, and the left and right sides that bare fibre is carved with grating part peels off coating and obtains fibre core respectively
3, alcohol (ensures that fibre core surface is clean) after cleaning surface, and the fibre core 3 i.e. grating region for peelling off coating is penetrated in capillary tubing 4,
On the other hand 4 one side of capillary tubing prevents encapsulating material from being in direct contact with grating, eliminates encapsulating material production for protecting grating
Influence of the raw clutter to grating wave, keeps measurement more accurate.
Third walks, and thin protective case 5 is placed on to the both ends of bare fibre, so that it is bonded with bare fibre using glue；It will be thin
Protective case 5 gos deep into the die-filling tool 1-2mm of dumbbell as over current protection area, ensures that bare fibre is not destroyed in joint；Again by thick armour
Dress layer 6 (inside having steel wire, diameter 4mm) is coated on 5 surface of protective case, equally gos deep into dumbbell shaped mold 1mm, is no more than thin protection
Set 5.The length of the thin protective case 5 and thick armor 6 should be greater than 500mm, to ensure subsequent wiring.
4th step, through third step treated bare fibre (including capillary tubing 4, thin protective case 5 and the thick armour put on
Dress layer 6) both sides are fixed on by the fixture 7 of fiber platform in fiber platform 2, and 7 position of fixture is adjustable, naked for ensureing
Optical fiber is placed at the axis of encapsulating mould 1.
5th step will pour into after 8 elastomer encapsulating material vacuum defoamation of polyurethane in the encapsulating mould with optical fiber, completely
After sealing the optical fiber in encapsulating mould 1, sample is obtained after being positioned over dry vacuum tank, solidification, demoulding, as shown in Figure 3.Optical fiber light
Grid and the fibre core for removing coat are all encapsulated with polyurethane elastomer, protect it from the incompatible problem of different materials.
The present invention has the advantage that compared with prior art：
(1) encapsulating material polyurethane with wearability, hardness range it is wide, with higher intensity and elasticity, hydrolytic resistance
It gets well, resistance to low temperature is good, the more low excellent performance of thermal coefficient.The present invention using polyurethane elastomer as encapsulating material,
Overall construction intensity is big, can be suitble to adverse circumstances；Stress sensitivity enhances.
(2) packaging method of the present invention is simple, reliable, portable, and the sensor being prepared can be by equipping stress, temperature etc.
Change and it is monitored, a variety of industrial occasions applications can be suitble to.
(3) present invention use polyurethane encapsulation FBG sensor not only can monitor marine engineering equipment in time but also can with gram
The affine sex chromosome mosaicism between different materials is taken, while fiber grating can also be protected, extends its service life.
Description of the drawings
Fig. 1 is that structure top view is implemented in present invention encapsulation；
Fig. 2 is that structure front view is implemented in present invention encapsulation；
Fig. 3 is the sensor structure figure after present invention demoulding；
Fig. 4 is prepared sensor wavelength-emergent property curve.
In Fig. 1 and 2：1 encapsulating mould；2 fiber platforms；3 peel off the fibre core of coating；4 capillary tubings；5 protective cases；6 armourings
Layer；The fixture of 7 fiber platforms；8 polyurethane.
Specific implementation mode
Below in conjunction with specific embodiment, the present invention will be further described.
A kind of method that polyurethane encapsulation fiber grating prepares sensor, using polyurethane as encapsulating material, including with
Lower step：
The first step keeps flat encapsulating mould 1 to fiber platform 2, as depicted in figs. 1 and 2.Encapsulating mould 4 is coated in advance
Releasing agent, the special encapsulating mould 1 are rectangular configuration, and dumbbell shaped cavity is equipped in encapsulating mould 1, and batten both ends are rectangular
Body structure, a length of 20mm, width 12mm, a height of 6mm, centre are long 40mm, wide 3mm, the connection strap of high 3mm, cavity distance
There are the threading holes of long 5mm, diameter 4mm for die edge；4 material of encapsulating mould is heat safe polytetrafluoroethylene (PTFE).
Second step, takes one section of bare fibre, and the left and right sides that bare fibre is carved with grating part strips out the fibre core 3 of 1cm long respectively,
Alcohol (ensures that fibre core surface is clean) after cleaning surface, and the fibre core 3 i.e. grating region for peelling off coating is penetrated in capillary tubing 4.
Third walks, and from the thin protective case 5 of two end caps of bare fibre and makes itself and bare fibre with the glue of model 704 successively
It bonds, then is bonded in successively from the thick armor 6 of two end cap certain lengths of optical fiber with 502 on thin protective case 5.
Thin protective case 5 gos deep into the die-filling tool 1-2mm of dumbbell as over current protection area, ensures that bare fibre is not destroyed in joint；Thick armour
Dress layer 6 (inside having steel wire, diameter 4mm) is coated on 5 surface of protective case, equally gos deep into dumbbell shaped mold 1mm, is no more than thin protection
Set 5.The length of the thin protective case 5 and thick armor 6 should be greater than 500mm, to ensure subsequent wiring.
4th step, bare fibre both sides are fixed on by the fixture 7 of fiber platform in fiber platform 2, and 7 position of alignment jig makes
Bare fibre is placed at the axis of encapsulating mould 1.
5th step will pour into the encapsulating mould with optical fiber after 8 encapsulating material vacuum defoamation of polyurethane, seal envelope completely
After optical fiber in die-filling tool 1, sample is obtained after being positioned over dry vacuum tank, solidification, demoulding, as shown in Figure 3.
Fig. 4 is the curve of the centre wavelength and suffered stress variation of the optical grating reflection of the fiber grating encapsulated with the present invention,
Can be seen that the stress of the fiber grating impression encapsulated with polyurethane from the curve on this figure and wavelength change have it is good linear
Relationship, and remolding sensitivity bare fibre wants high.
Embodiment described above only expresses embodiments of the present invention, but can not therefore be interpreted as to patent of the present invention
Range limitation, it is noted that for those skilled in the art, without departing from the inventive concept of the premise, also
Several modifications and improvements can be made, these are all belonged to the scope of protection of the present invention.
Claims (5)
1. a kind of method that polyurethane encapsulation fiber grating prepares sensor, which is characterized in that this method uses polyurethane conduct
Encapsulating material includes the following steps：
The first step keeps flat encapsulating mould (1) to fiber platform (2)；The advance coated releasing agent of encapsulating mould (4), it is described
Encapsulating mould (1) is rectangular configuration, " dumbbell shaped " cavity is equipped in encapsulating mould (1), cavity both ends are rectangular parallelepiped structure, intermediate
It is connected by elongate configuration；Cavity is closing on die edge side equipped with threading hole；
Second step, takes one section of bare fibre, and the left and right sides that bare fibre is carved with grating part peels off coating and obtains fibre core (3) respectively,
Alcohol cleans surface, and fibre core (3) the i.e. grating region for peelling off coating is penetrated in capillary tubing (4)；
Third walks, and protective case (5) is placed on to the both ends of bare fibre, so that it is bonded with bare fibre using glue；Protective case (5) is deep
Enter dumbbell shaped mold 1-2mm as over current protection area, ensures that bare fibre is not destroyed in joint；Armor (6) is coated on again
The die-filling tool 1mm of dumbbell is equally goed deep on protective case (5) surface, is no more than the depth that protective case (5) gos deep into dumbbell shaped mold；
4th step, through third step, treated that bare fibre both sides are fixed on fiber platform (2) by the fixture (7) of fiber platform
On, the fixture (7) position is adjustable, for ensureing that bare fibre is placed at the axis of encapsulating mould (1)；
5th step will pour into the encapsulating mould with optical fiber after polyurethane (8) encapsulating material vacuum defoamation, seal encapsulation completely
After optical fiber in mold (1), sample is obtained after being positioned over dry vacuum tank, solidification, demoulding.
2. the method that a kind of polyurethane encapsulation fiber grating according to claim 1 prepares sensor, which is characterized in that institute
The cavity both ends a length of 20mm of cuboid stated, width 12mm, a height of 6mm, centre be long 40mm, wide 3mm, the connection strap of high 3mm,
Long 5mm, the diameter 4mm of threading hole.
3. the method that a kind of polyurethane encapsulation fiber grating according to claim 1 or 2 prepares sensor, feature exist
In the length of the protective case (5) and armor (6) should be greater than 500mm, for ensureing follow-up wiring.
4. the method that a kind of polyurethane encapsulation fiber grating according to claim 1 or 2 prepares sensor, feature exist
In the encapsulating mould (1) material is polytetrafluoroethylene (PTFE).
5. the method that a kind of polyurethane encapsulation fiber grating according to claim 3 prepares sensor, which is characterized in that institute
Encapsulating mould (1) material stated is polytetrafluoroethylene (PTFE).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810530864.2A CN108680289A (en) | 2018-05-24 | 2018-05-24 | A kind of method that polyurethane encapsulation fiber grating prepares sensor |
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| CN201810530864.2A CN108680289A (en) | 2018-05-24 | 2018-05-24 | A kind of method that polyurethane encapsulation fiber grating prepares sensor |
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| CN201810530864.2A Pending CN108680289A (en) | 2018-05-24 | 2018-05-24 | A kind of method that polyurethane encapsulation fiber grating prepares sensor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110044823A (en) * | 2019-04-28 | 2019-07-23 | 北京航天控制仪器研究所 | A kind of production method of fiber bragg grating temperature sensor |
| CN111777071A (en) * | 2020-05-25 | 2020-10-16 | 新疆东方希望新能源有限公司 | Clamping tool for loading and unloading oversized polycrystalline silicon rods |
| CN113359225A (en) * | 2021-05-21 | 2021-09-07 | 西安交通大学 | Preparation and application method of optical fiber sensor for measuring external curvature of columnar material |
| CN114001842A (en) * | 2021-10-22 | 2022-02-01 | 天津航空机电有限公司 | High-temperature optical fiber temperature sensor |
| CN114485904A (en) * | 2022-01-25 | 2022-05-13 | 西北大学 | Ultrasonic sensor based on conical multi-core optical fiber |
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| CN103743353A (en) * | 2013-12-27 | 2014-04-23 | 南京航空航天大学 | Surface steel nail type steel sleeve packed optical fiber raster strain sensor and method the same |
| CN104142189A (en) * | 2014-08-22 | 2014-11-12 | 国家电网公司 | Fiber bragg grating temperature sensor applied to power equipment |
| CN204313802U (en) * | 2014-12-09 | 2015-05-06 | 国家电网公司 | A kind of strain transducer based on temperature compensation fiber grating |
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| US20130098164A1 (en) * | 2010-01-21 | 2013-04-25 | Florida State University Research Foundation, Inc. | Triboluminescent optical fiber sensor |
| CN103335605A (en) * | 2013-07-08 | 2013-10-02 | 大连理工大学 | High-durability binder-free packaging optical fiber grating strain sensor and packaging method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110044823A (en) * | 2019-04-28 | 2019-07-23 | 北京航天控制仪器研究所 | A kind of production method of fiber bragg grating temperature sensor |
| CN111777071A (en) * | 2020-05-25 | 2020-10-16 | 新疆东方希望新能源有限公司 | Clamping tool for loading and unloading oversized polycrystalline silicon rods |
| CN113359225A (en) * | 2021-05-21 | 2021-09-07 | 西安交通大学 | Preparation and application method of optical fiber sensor for measuring external curvature of columnar material |
| CN113359225B (en) * | 2021-05-21 | 2022-10-25 | 西安交通大学 | Preparation and application method of optical fiber sensor for measuring external curvature of columnar material |
| CN114001842A (en) * | 2021-10-22 | 2022-02-01 | 天津航空机电有限公司 | High-temperature optical fiber temperature sensor |
| CN114485904A (en) * | 2022-01-25 | 2022-05-13 | 西北大学 | Ultrasonic sensor based on conical multi-core optical fiber |
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Application publication date: 20181019 |