CN104033457A - Mounting method of fiber Bragg grating sensor - Google Patents
Mounting method of fiber Bragg grating sensor Download PDFInfo
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- CN104033457A CN104033457A CN201310071385.6A CN201310071385A CN104033457A CN 104033457 A CN104033457 A CN 104033457A CN 201310071385 A CN201310071385 A CN 201310071385A CN 104033457 A CN104033457 A CN 104033457A
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Abstract
The invention belongs to the fiber Bragg grating sensor application technology and relates to a mounting method of a fiber grating sensor. The mounting method of the fiber grating sensor obtains a fiber grating sensor adhering process which has ideal strain transmitting effects, good repeatability and high stability by combining analysis results of a strain transmitting theory of a sensor, selecting a variety of adhesives, using different processes for adhering the sensor and verifying the adhering effects through a standard beam test. Further, the fiber grating sensor is adhered by controlling key factors such as the elastic modulus of the adhesives, the adhering length and the adhering layer thickness which affect the strain transmitting rate of the fiber grating sensor, so that the obtained fiber grating sensor has high strain transmitting rates, good repeatability and stable strain sensitivity coefficients, can accurately measure the true strain of monitoring sites and ensures the effectiveness and reliability of the monitoring results.
Description
Technical field
The invention belongs to fiber Bragg grating sensor application technology, relate to a kind of installation method of fiber-optic grating sensor.
Background technique
Fiber Bragg grating sensor (Fiber Bragg Grating, FBG) be the function admirable optical sensor that a kind of developed recently gets up, it responds to the minor variations of extraneous stress by the drift of Bragg grating centre wavelength, therefore can apply fiber Bragg grating sensor and carry out the strain measurement in engineering structure.For conventional electric resistance wire strain gauge, the advantage of fiber-optic grating sensor is that anti-electromagnetic interference capability is strong and have long-term stability, is especially suitable for the long term monitoring of structural strain.In the time of monitor strain, fiber-optic grating sensor need to be sticked on by geodesic structure, and fiber-optic grating sensor is very little (125 μ cylindrical body m) of diameter, sensor and be line contact between geodesic structure when stickup, this has brought difficulty, the improper loss that easily causes strain transfer of method of attaching with regard to the stickup of giving sensor.Research finds, the technology for applying of fiber-optic grating sensor directly affects by the transmission effect of geodesic structure logarithmic strain.
The use of fiber-optic grating sensor requires higher to technology for applying, the sensor being applied at present in engineering reality all carried out encapsulation mostly before installing.The sensor bulk of packaged type is relatively large, and cost is high more a lot of than naked grid.Aircaft configuration more complicated, much need to carry out the key position narrow space of strain monitoring, and in addition, the strain monitoring required precision of aircaft configuration is higher, and this just needs the sensor that volume is as far as possible little, with logarithmic strain that can Measurement accuracy monitoring point.In the ground experiment of aircaft configuration, the quantity of strain monitoring point is huge, and the cost of sensor directly affects testing expenses.Therefore, ripe grating sensor technology for applying can improve the measuring accuracy of strain in aircaft configuration ground experiment, and Control experiment cost.
Technology for applying about fiber Bragg grating sensor rarely has report, similar from the known existing fiber-optic grating sensor method of attaching of limited data and electric resistance wire strain gauge bonding method, polish, clean tested body structure surface, with 502 Instant cements, fiber-optic grating sensor is pasted by geodesic structure afterwards.But because structure and the sensing principle of fiber Bragg grating sensor and electric resistance wire strain gauge have very big difference, so existing method of attaching in actual applications effect is very undesirable, exist and have very much many defects, as strain transfer not, compressive strain measures that inaccurate, poor repeatability, ga(u)ge factor are unstable, the easily problem such as damage of sensor.
The method of attaching of fiber-optic grating sensor has a significant impact the strain transfer of sensor, and wherein binder Young's modulus, stickup length, stickup thickness are all the key factors that affects strain transfer.The average strain transfer rate of finding sensor by theory analysis and experimental study along with the increase of thickness of adhibited layer reduce, along with the increase of pasting length increases, and the larger average strain transfer rate of the Young's modulus of glue-line is larger.The present invention has considered each factor that affects strain transfer, has both ensured high strain transfer rate, can ensure again conformity and the stability of ga(u)ge factor, and it is as much as possible little to make to paste length.
Summary of the invention
Object of the present invention: the invention provides the fiber-optic grating sensor method of attaching that a kind of strain transfer rate is high, strain transfer is reproducible, ga(u)ge factor is stable.
Technological scheme of the present invention: a kind of fiber Bragg grating sensor method of attaching, it comprises the following steps,
Step 1: use sand papering measuring point, and clean the position of polishing;
Step 2: peeling optical fibre grating sensor grid region coating layer, and clean grid region;
Step 3: fiber-optic grating sensor grid region is applied with polyimide;
Step 4: sensor sticking area is carried out to mark, and between two gauge points, distance is 20～25mm, is distributed in the middle of sticking area grid region;
Step 5: determine concrete paste position on by geodesic structure, and covering protection is carried out in the position beyond sticking area with polytetrafluoroethylene film;
Step 6: fiber-optic grating sensor is placed in by geodesic structure, sensor is tentatively fixed, then paste the region in gauge point on fiber-optic grating sensor with Instant cement, sticking area is evenly pushed simultaneously, unnecessary glue is extruded;
Step 7: after Instant cement solidifies completely, fixing grid region gauge point, is at least 24 hours curing time;
Step 8: the adhesive tape of pasting while removing preliminary fixation of sensor and polytetrafluoroethylene film.
In step 6, evenly in the time of fixation of sensor, it is applied to the pulling force that approximately can produce 100 μ ε for ensureing that sensor is stressed, paste the region between gauge point on fiber-optic grating sensor with Loctite401 Instant cement again, cover polytetrafluoroethylene film with finger simultaneously sticking area is evenly squeezed out to unnecessary glue.
Between the gauge point of fiber-optic grating sensor grid region, fix with DG-3S epoxy glue.
Beneficial effect of the present invention: the present invention affects the key factor of fiber-optic grating sensor strain transfer rate by controlling binder Young's modulus (binder is selected), stickup length, thickness of adhibited layer etc., implement the stickup of fiber-optic grating sensor, the fiber-optic grating sensor strain transfer rate that obtains is high, reproducible, ga(u)ge factor stable, logarithmic strain that can Measurement accuracy monitoring point, ensures the validity and reliability of fiber-optic grating sensor monitoring result.
Brief description of the drawings
Fig. 1 fiber Bragg grating sensor of the present invention is pasted length control schematic diagram;
Fig. 2 is that fiber Bragg grating sensor of the present invention is pasted THICKNESS CONTROL schematic diagram.
Wherein: 1. optical fiber, 2. fiber-optic grating sensor grid region, 3. gauge point, 4. polytetrafluoroethylene film, 5. adhesive tape.
Embodiment
Below by embodiment, the present invention is described in further detail:
Research finds that the average strain transfer rate of sensor reduces along with the increase of thickness of adhibited layer, increases along with pasting the increase of length, and the larger average strain transfer rate of the Young's modulus of glue-line is larger.Therefore must consider each factor that affects strain transfer, both ensure high strain transfer rate, can protect again conformity and the stability of ga(u)ge factor, and it is as much as possible little to make to paste length.
Ensure high strain transfer rate, just need to reduce to paste thickness and increase and paste length, can not be long but paste length, by analysis and verification experimental verification, paste length while being 20～25mm strain transfer rate higher.Ensure conformity and the stability of transmissibility, consistent with stickup length with regard to ensureing each bondline thickness of pasting.
Fiber-optic grating sensor method of attaching of the present invention is in conjunction with the strain transfer theoretical analysis result to sensor, select multiple binder, use different technique to paste sensor, and test sticking effect has been carried out to verification experimental verification by Standard Beam, drawn the fiber-optic grating sensor barbola work that strain transfer is satisfactory for result, reproducible, stability is high, its concrete implementation step is described as follows in conjunction with Fig. 1 and Fig. 2:
Step 1: use sand papering measuring point, and clean the position of polishing with alcohol or other organic reagents;
Step 2: peeling optical fibre grating sensor grid region 2 place's coating layers, and clean grid region;
Step 3: fiber-optic grating sensor grid region 2 is applied with polyimide;
Step 4: sensor sticking area is carried out to mark, and between two gauge points 3, distance is 20～25mm, is distributed in the middle of two gauge points 3 grid region;
Step 5: determine concrete paste position (i.e. position between two gauge points) on by geodesic structure, for sticking area being controlled between two gauge points 3, covering protection is carried out in sticking area position in addition with polytetrafluoroethylene film 4;
Step 6: fiber-optic grating sensor is placed in by geodesic structure, sensor is tentatively fixed with adhesive tape 5, evenly it is applied to the pulling force that approximately can produce 100 μ ε when the fixation of sensor for ensureing that sensor is stressed, paste the region between gauge point on fiber-optic grating sensor with Loctite401 Instant cement again, cover polytetrafluoroethylene film 4 with finger simultaneously sticking area is evenly pushed, unnecessary glue is extruded;
Step 7: after Instant cement solidifies completely (approximately 4～8 hours), fix with DG-3S epoxy glue between the gauge point of grid region, be at least 24 hours curing time;
Step 8: the adhesive tape 5 of pasting while removing preliminary fixation of sensor and polytetrafluoroethylene film 4.
Wherein, step 2 divests fiber-optic grating sensor grid region coating layer, is because coating layer quality is soft, Young's modulus is little, is unfavorable for strain transfer; Step 3 is used polyimide to apply sensor grid region, and polyimide Young's modulus is large and strong with optical fiber and Loctite401 Instant cement combination force, can effectively improve the strain transfer rate of sensor; Step 5 is controlled effective stickup length of sensor; The binder Loctite401 Instant cement that step 6 is selected is large through measuring Young's modulus, simultaneously because Loctite401 stickiness is very low, with finger evenly extruding sticking area can make that thickness of adhibited layer is less and maintenance is relatively constant.
Claims (3)
1. a fiber Bragg grating sensor method of attaching, is characterized in that, comprise the following steps,
Step 1: use sand papering measuring point, and clean the position of polishing;
Step 2: peeling optical fibre grating sensor grid region coating layer, and clean grid region;
Step 3: fiber-optic grating sensor grid region is applied with polyimide;
Step 4: sensor sticking area is carried out to mark, and between two gauge points, distance is 20～25mm, is distributed in the middle of sticking area grid region;
Step 5: determine concrete paste position on by geodesic structure, and covering protection is carried out in the position beyond sticking area with polytetrafluoroethylene film;
Step 6: fiber-optic grating sensor is placed in by geodesic structure, sensor is tentatively fixed, then paste the region in gauge point on fiber-optic grating sensor with Instant cement, sticking area is evenly pushed simultaneously, unnecessary glue is extruded;
Step 7: after Instant cement solidifies completely, fixing grid region gauge point, is at least 24 hours curing time;
Step 8: the adhesive tape of pasting while removing preliminary fixation of sensor and polytetrafluoroethylene film.
2. fiber Bragg grating sensor method of attaching according to claim 1, it is characterized in that, in step 6, evenly in the time of fixation of sensor, it is applied to the pulling force that approximately can produce 100 μ ε for ensureing that sensor is stressed, paste the region between gauge point on fiber-optic grating sensor with Loctite401 Instant cement again, cover polytetrafluoroethylene film with finger simultaneously sticking area is evenly squeezed out to unnecessary glue.
3. fiber Bragg grating sensor method of attaching according to claim 1, is characterized in that, between the gauge point of fiber-optic grating sensor grid region, fixes with DG-3S epoxy glue.
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| CN201310071385.6A CN104033457B (en) | 2013-03-06 | 2013-03-06 | A kind of fiber Bragg grating sensor method of attaching |
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| CN201310071385.6A CN104033457B (en) | 2013-03-06 | 2013-03-06 | A kind of fiber Bragg grating sensor method of attaching |
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| CN104033457B CN104033457B (en) | 2016-06-22 |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104596437A (en) * | 2015-01-12 | 2015-05-06 | 武汉理工大学 | Handheld adhesion tool for fiber bragg grating surface strain measurement and method |
| CN104596436A (en) * | 2015-01-12 | 2015-05-06 | 武汉理工大学 | Pasting and fixing device and method for magnetic-type optical fiber and optical grating strain sensor |
| CN105716535A (en) * | 2016-03-15 | 2016-06-29 | 北京信息科技大学 | Sensor bridging mode for testing strain of thin test specimen |
| CN105758323A (en) * | 2016-03-15 | 2016-07-13 | 北京信息科技大学 | Method of testing thin specimen strain based on FBG sensor |
| CN108473833A (en) * | 2016-01-15 | 2018-08-31 | 日东电工株式会社 | Curing type adhesive/bonding sheet |
| CN109029281A (en) * | 2018-08-30 | 2018-12-18 | 合肥师范学院 | A method of pasting FBG sensor on carbon fibre reinforced composite |
| WO2020024340A1 (en) * | 2018-08-02 | 2020-02-06 | 大连理工大学 | Method for detecting bolt fastening joint face pressure based on fbg sensor |
| CN111337064A (en) * | 2020-03-25 | 2020-06-26 | 南京智慧基础设施技术研究院有限公司 | Fixing method of fiber grating string sensor |
| CN112212796A (en) * | 2020-09-27 | 2021-01-12 | 山东航天电子技术研究所 | Method for consistently installing and calibrating strain rosette sensor of three-dimensional fiber bragg grating |
| CN112710247A (en) * | 2020-12-08 | 2021-04-27 | 北京信息科技大学 | Surface-pasted fiber grating strain sensor packaging method |
| CN113834434A (en) * | 2021-07-20 | 2021-12-24 | 重庆万桥交通科技发展有限公司 | Bare fiber grating sensor packaging structure and packaging method |
| CN114279354A (en) * | 2022-01-05 | 2022-04-05 | 株洲时代新材料科技股份有限公司 | FBG high-strain transmissibility rapid pasting and laying method under high humidity of wind power blade |
| EP4080172A1 (en) * | 2021-04-20 | 2022-10-26 | Palo Alto Research Center Incorporated | Apparatus for attaching optical fiber to a structure |
| US11668889B2 (en) | 2021-04-20 | 2023-06-06 | Palo Alto Research Center Incorporated | System for applying pre-strain to an optical sensor |
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Cited By (20)
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|---|---|---|---|---|
| CN104596436B (en) * | 2015-01-12 | 2018-05-01 | 武汉理工大学 | Magnetic-type fiber Bragg grating strain sensor pastes fixing device and method |
| CN104596436A (en) * | 2015-01-12 | 2015-05-06 | 武汉理工大学 | Pasting and fixing device and method for magnetic-type optical fiber and optical grating strain sensor |
| CN104596437A (en) * | 2015-01-12 | 2015-05-06 | 武汉理工大学 | Handheld adhesion tool for fiber bragg grating surface strain measurement and method |
| US11274231B2 (en) | 2016-01-15 | 2022-03-15 | Nitto Denko Corporation | Stickable-curable adhesive sheet |
| CN108473833A (en) * | 2016-01-15 | 2018-08-31 | 日东电工株式会社 | Curing type adhesive/bonding sheet |
| CN108473833B (en) * | 2016-01-15 | 2021-04-13 | 日东电工株式会社 | Curing type adhesive sheet |
| CN105716535A (en) * | 2016-03-15 | 2016-06-29 | 北京信息科技大学 | Sensor bridging mode for testing strain of thin test specimen |
| CN105758323B (en) * | 2016-03-15 | 2018-09-07 | 北京信息科技大学 | A method of thin test specimen strain is tested based on FBG sensor |
| CN105758323A (en) * | 2016-03-15 | 2016-07-13 | 北京信息科技大学 | Method of testing thin specimen strain based on FBG sensor |
| WO2020024340A1 (en) * | 2018-08-02 | 2020-02-06 | 大连理工大学 | Method for detecting bolt fastening joint face pressure based on fbg sensor |
| US11131591B2 (en) | 2018-08-02 | 2021-09-28 | Dalian University Of Technology | FBG sensor-based bolt fastening joint surface pressure detection method |
| CN109029281A (en) * | 2018-08-30 | 2018-12-18 | 合肥师范学院 | A method of pasting FBG sensor on carbon fibre reinforced composite |
| CN111337064A (en) * | 2020-03-25 | 2020-06-26 | 南京智慧基础设施技术研究院有限公司 | Fixing method of fiber grating string sensor |
| CN112212796A (en) * | 2020-09-27 | 2021-01-12 | 山东航天电子技术研究所 | Method for consistently installing and calibrating strain rosette sensor of three-dimensional fiber bragg grating |
| CN112710247A (en) * | 2020-12-08 | 2021-04-27 | 北京信息科技大学 | Surface-pasted fiber grating strain sensor packaging method |
| EP4080172A1 (en) * | 2021-04-20 | 2022-10-26 | Palo Alto Research Center Incorporated | Apparatus for attaching optical fiber to a structure |
| US11668889B2 (en) | 2021-04-20 | 2023-06-06 | Palo Alto Research Center Incorporated | System for applying pre-strain to an optical sensor |
| CN113834434A (en) * | 2021-07-20 | 2021-12-24 | 重庆万桥交通科技发展有限公司 | Bare fiber grating sensor packaging structure and packaging method |
| CN114279354A (en) * | 2022-01-05 | 2022-04-05 | 株洲时代新材料科技股份有限公司 | FBG high-strain transmissibility rapid pasting and laying method under high humidity of wind power blade |
| CN114279354B (en) * | 2022-01-05 | 2024-03-12 | 株洲时代新材料科技股份有限公司 | FBG high-strain-transmissibility pasting and laying method for wind power blade under high humidity |
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