CN104033457B - A kind of fiber Bragg grating sensor method of attaching - Google Patents
A kind of fiber Bragg grating sensor method of attaching Download PDFInfo
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- CN104033457B CN104033457B CN201310071385.6A CN201310071385A CN104033457B CN 104033457 B CN104033457 B CN 104033457B CN 201310071385 A CN201310071385 A CN 201310071385A CN 104033457 B CN104033457 B CN 104033457B
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Abstract
The invention belongs to fiber Bragg grating sensor application technology, relate to the installation method of a kind of fiber-optic grating sensor。The present invention combines the strain transfer theoretical analysis result to sensor, select multiple bonding agent, use different technique that sensor has been pasted, and by Standard Beam test, sticking effect has been carried out verification experimental verification, draw the fiber-optic grating sensor barbola work that strain transfer is satisfactory for result, reproducible, stability is high。And the key factor of fiber-optic grating sensor strain transfer ratio is affected by control bonding agent elastic modelling quantity, stickup length, thickness of adhibited layer etc., implement the stickup of fiber-optic grating sensor, obtained fiber-optic grating sensor strain transfer ratio is high, reproducible, ga(u)ge factor is stable, can accurately measure the logarithmic strain of monitoring point, it is ensured that the validity and reliability of fiber-optic grating sensor monitoring result。
Description
Technical field
The invention belongs to fiber Bragg grating sensor application technology, relate to the installation method of a kind of fiber-optic grating sensor。
Background technology
Fiber Bragg grating sensor (FiberBraggGrating, FBG) it is the function admirable optical sensor that gets up of a kind of developed recently, it senses the minor variations of extraneous stress by the drift of Bragg grating centre wavelength, therefore can apply fiber Bragg grating sensor to carry out the strain measurement in engineering structure。For conventional electric resistance wire strain gauge, the advantage of fiber-optic grating sensor is in that anti-electromagnetic interference capability is strong and has long-term stability, is especially suitable for the long term monitoring of structural strain。When measuring strain, need to be pasted onto fiber-optic grating sensor by geodesic structure, and fiber-optic grating sensor is the cylinder of a diameter only small (125 μm), sensor and be linear contact lay between geodesic structure during stickup, this just brings difficulty to the stickup of sensor, the improper loss easily causing strain transfer of method of attaching。Research finds, the technology for applying of fiber-optic grating sensor directly affects the transmission effect by geodesic structure logarithmic strain。
Technology for applying is required higher by the use of fiber-optic grating sensor, and being applied to the sensor in engineering reality at present is all carried out encapsulation before the mounting mostly。The sensor bulk of packaged type is relatively large, and cost is higher than naked grid a lot。Aircaft configuration is more complicated, much needs to carry out the key position narrow space of strain monitoring, additionally, the strain monitoring required precision of aircaft configuration is higher, this is accomplished by the sensor that volume is little as far as possible, can accurately measure the logarithmic strain of 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 certainty of measurement of strain in aircaft configuration ground experiment Control experiment cost。
Technology for applying about fiber Bragg grating sensor rarely has report, similar with electric resistance wire strain gauge bonding method from the limited known existing fiber-optic grating sensor method of attaching of data, namely polish, clean tested body structure surface, with 502 Instant cements, fiber-optic grating sensor is pasted by geodesic structure afterwards。But owing to 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 effect in actual applications is very undesirable, existing and have very much many defects, the problems such as inaccurate, poor repeatability, ga(u)ge factor are unstable, sensor is easily damaged are measured in as inadequate in strain transfer, compression strain。
The strain transfer of sensor is had a significant impact by the method for attaching of fiber-optic grating sensor, and wherein bonding agent elastic modelling quantity, stickup length, stickup thickness are all the key factors affecting strain transfer。Find that the average strain transfer rate of sensor reduces along with the increase of thickness of adhibited layer, increases along with the increase pasting length by theory analysis and experimental study, and the more big average strain transfer rate of the elastic modelling quantity of glue-line is more big。The present invention has considered each factor affecting strain transfer, has both ensured high strain transfer ratio, can guarantee that again the concordance of ga(u)ge factor and stability, and makes stickup length little as much as possible。
Summary of the invention
The purpose of the present invention: the present invention provides the fiber-optic grating sensor method of attaching that a kind of strain transfer ratio is high, strain transfer is reproducible, ga(u)ge factor is stable。
Technical scheme: 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 polished；
Step 2: peeling optical fibre grating sensor grid region coat, and clean grid region；
Step 3: fiber-optic grating sensor grid region is coated with polyimides；
Step 4: sensor sticking area is carried out labelling, the spacing of 2 labelling points is 20～25mm, makes grid region be distributed in the middle of sticking area；
Step 5: determined concrete paste position on geodesic structure, and with polytetrafluoroethylene film, the position beyond sticking area is being carried out covering protection；
Step 6: fiber-optic grating sensor is placed in and, on geodesic structure, sensor is tentatively fixed, then with the region that Instant cement is pasted on fiber-optic grating sensor in labelling point, sticking area is uniformly extruded, by unnecessary glue extrusion. simultaneously；
Step 7: after Instant cement is fully cured, fixing grid region labelling point, it is at least 24 hours hardening time；
Step 8: the adhesive tape pasted when removing preliminary fixing sensor and polytetrafluoroethylene film。
For ensureing that its applying uniformly about can be produced the pulling force of 100 μ ε by force acting on transducer when fixing sensor in step 6, use the region between labelling point on Loctite401 Instant cement stickup fiber-optic grating sensor again, cover polytetrafluoroethylene film with finger simultaneously and sticking area is uniformly squeezed out unnecessary glue。
Fix with DG-3S epoxy glue between the labelling point of fiber-optic grating sensor grid region。
Beneficial effects of the present invention: the present invention affects the key factor of fiber-optic grating sensor strain transfer ratio by controlling bonding agent elastic modelling quantity (bonding agent selection), pasting length, thickness of adhibited layer etc., implement the stickup of fiber-optic grating sensor, obtained fiber-optic grating sensor strain transfer ratio is high, reproducible, ga(u)ge factor is stable, can accurately measure the logarithmic strain of monitoring point, it is ensured that the validity and reliability of fiber-optic grating sensor monitoring result。
Accompanying drawing explanation
Fig. 1 fiber Bragg grating sensor of the present invention is pasted length and is controlled schematic diagram；
Fig. 2 is that fiber Bragg grating sensor of the present invention pastes THICKNESS CONTROL schematic diagram。
Wherein: 1. optical fiber, 2. fiber-optic grating sensor grid region, 3. labelling point, 4. polytetrafluoroethylene film, 5. adhesive tape。
Detailed description of the invention
Below by detailed description of the invention, 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 the increase pasting length, and the more big average strain transfer rate of the elastic modelling quantity of glue-line is more big。Therefore must consider each factor affecting strain transfer, both ensure high strain transfer ratio, concordance and the stability of ga(u)ge factor can be protected again, and make stickup length little as much as possible。
Ensure high strain transfer ratio, it is necessary to reduce and paste thickness and increase and paste length, but paste length can not be long, by analysis and verification experimental verification, paste strain transfer ratio when length is 20～25mm higher。Ensure concordance and the stability of transport, it is necessary that the bondline thickness pasted is consistent with pasting length every time。
Fiber-optic grating sensor method of attaching of the present invention combines the strain transfer theoretical analysis result to sensor, select multiple bonding agent, use different technique that sensor has been pasted, and by Standard Beam test, sticking effect has been carried out verification experimental verification, having drawn the fiber-optic grating sensor barbola work that strain transfer is satisfactory for result, reproducible, stability is high, it is embodied as step and illustrates in conjunction with Fig. 1 and Fig. 2 as follows:
Step 1: use sand papering measuring point, and clean, with ethanol or other organic reagents, the position polished；
Step 2: peeling optical fibre grating sensor grid region 2 place coat, and clean grid region；
Step 3: fiber-optic grating sensor grid region 2 is coated with polyimides；
Step 4: sensor sticking area is carried out labelling, the spacing of 2 labelling points 3 is 20～25mm, makes grid region be distributed in the middle of 2 labelling points 3；
Step 5: determined concrete paste position (i.e. position between 2 labelling points) on geodesic structure, for being controlled by sticking area between 2 labelling points 3, with polytetrafluoroethylene film 4, the position beyond sticking area is being carried out covering protection；
Step 6: fiber-optic grating sensor is placed in by geodesic structure, with adhesive tape 5, sensor is tentatively fixed, for ensureing that its applying uniformly about can be produced the pulling force of 100 μ ε by force acting on transducer when fixing sensor, use the region between labelling point on Loctite401 Instant cement stickup fiber-optic grating sensor again, cover polytetrafluoroethylene film 4 with finger sticking area is uniformly extruded, by unnecessary glue extrusion simultaneously；
Step 7: after Instant cement is fully cured (about 4～8 hours), fixes with DG-3S epoxy glue between grid region labelling point, be at least 24 hours hardening time；
Step 8: the adhesive tape 5 pasted when removing preliminary fixing sensor and polytetrafluoroethylene film 4。
Wherein, fiber-optic grating sensor grid region coat is divested by step 2, is owing to coat quality is soft, elastic modelling quantity is little, is unfavorable for strain transfer；Step 3 uses polyimides that sensor grid region is coated, and polyimides elastic modelling quantity is big and strong with optical fiber and Loctite401 Instant cement adhesion, it is possible to be effectively improved the strain transfer ratio of sensor；What step 5 controlled sensor effectively pastes length；The bonding agent Loctite401 Instant cement that step 6 is selected is big through measuring elastic modelling quantity, simultaneously because Loctite401 viscosity is non-normally low, uniformly extrudes sticking area with finger and thickness of adhibited layer can be made less and keep relative constancy。
Claims (3)
1. a fiber Bragg grating sensor method of attaching, it is characterised in that comprise the following steps,
Step 1: use sand papering measuring point, and clean the position polished；
Step 2: peeling optical fibre Bragg grating sensor grid region coat, and clean grid region；
Step 3: fiber Bragg grating sensor grid region is coated with polyimides；
Step 4: sensor sticking area is carried out labelling, the spacing of 2 labelling points is 20～25mm, makes grid region be distributed in the middle of sticking area；
Step 5: determined concrete paste position on geodesic structure, and with polytetrafluoroethylene film, the position beyond paste position is being carried out covering protection；
Step 6: fiber Bragg grating sensor is placed in and, on geodesic structure, sensor is tentatively fixed, then with the region that Instant cement is pasted on fiber Bragg grating sensor in labelling point, sticking area is uniformly extruded, by unnecessary glue extrusion. simultaneously；
Step 7: after Instant cement is fully cured, region between the labelling point of fixing grid region, dry glue is at least 24 hardening time
Hour；
Step 8: the adhesive tape pasted when removing preliminary fixing sensor and polytetrafluoroethylene film。
2. fiber Bragg grating sensor method of attaching according to claim 1, it is characterized in that, for ensureing that its applying uniformly about can be produced the pulling force of 100 μ ε by force acting on transducer when fixing sensor in step 6, use the region between labelling point on Loctite401 Instant cement stickup fiber Bragg grating sensor again, cover polytetrafluoroethylene film with finger simultaneously and sticking area is uniformly squeezed out unnecessary glue。
3. fiber Bragg grating sensor method of attaching according to claim 1, it is characterised in that fix with DG-3S epoxy glue between the labelling point of fiber Bragg grating sensor grid region。
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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 true CN104033457B (en) | 2016-06-22 |
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Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104596437B (en) * | 2015-01-12 | 2018-01-12 | 武汉理工大学 | Hand-held paste tool and method for fiber grating surface strain measurement |
| 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 |
| JP6449795B2 (en) * | 2016-01-15 | 2019-01-09 | 日東電工株式会社 | Curing type adhesive sheet |
| 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 |
| CN105716535B (en) * | 2016-03-15 | 2018-09-21 | 北京信息科技大学 | A kind of sensor group bridge mode for testing thin test specimen strain |
| CN109186822B (en) * | 2018-08-02 | 2020-08-14 | 大连理工大学 | Bolt fastening joint surface pressure detection method based on FBG sensor |
| 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 |
| CN112212796B (en) * | 2020-09-27 | 2022-04-29 | 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 |
| US11668889B2 (en) | 2021-04-20 | 2023-06-06 | Palo Alto Research Center Incorporated | System for applying pre-strain to an optical sensor |
| US20220332103A1 (en) * | 2021-04-20 | 2022-10-20 | Palo Alto Research Center Incorporated | Apparatus for attaching optical fiber to a structure |
| 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 |
| 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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