CN103673914B - A kind of fiber Bragg grating strain sensor and installation method thereof - Google Patents
A kind of fiber Bragg grating strain sensor and installation method thereof Download PDFInfo
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- CN103673914B CN103673914B CN201310685222.7A CN201310685222A CN103673914B CN 103673914 B CN103673914 B CN 103673914B CN 201310685222 A CN201310685222 A CN 201310685222A CN 103673914 B CN103673914 B CN 103673914B
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Abstract
The present invention relates to a kind of fiber Bragg grating strain sensor and installation method thereof, fiber Bragg grating strain sensor is made up of snappiness beam, pillar stiffener, gear sheet, installation substrate and fiber grating; In fiber Bragg grating strain sensor encapsulation process, pillar stiffener and gear sheet are that fiber grating preload stretching strain provides support power; Fiber Bragg grating strain sensor installation method is: by bonding for installation substrate or be welded on body structure surface to be measured, or by within snappiness beam, the bonding fiber at fiber grating two ends at body structure surface to be measured, then remove gear sheet; Fiber Bragg grating strain sensor structure disclosed by the invention and installation method are that fiber grating preload stretching strain provides support power by pillar stiffener and gear sheet, and material consistence and requirement on machining accuracy to structure are low; By removing gear sheet, fiber Bragg grating strain sensor is had and good answers sensibility variable and sensitivity consistence.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, it is specifically related to a kind of fiber Bragg grating strain sensor and installation method thereof.
Background technology
Fiber Bragg grating strain sensor utilize fiber grating reflectance spectrum centre wavelength and fiber grating strained between linear relationship measure, have electromagnetism interference, volume is little, far measuring distance, signal easily transmit, the easy advantage such as multiplexing, good stability, becomes the important means of structured testing and monitoring structural health conditions.
There is easy tensile strain, be not easily applied in compressive strain and the grid region problem that reflectance spectrum easily produces to warble under nonhomogeneous strain effect in fiber grating; When optical fiber Bragg grating encapsulation becomes strain transducer, it is necessary to for drawing/compressive strain is measured, anti-reflectance spectrum is warbled etc. carries out structure and installation method design targetedly.
Existing a kind of can measure simultaneously draw/the fiber Bragg grating strain sensor structure of compressive strain and installation method as shown in patent " WO2009106576A1; MethodandMeansforMonitoringABraggFibreonaSurface ", Polymide or the ORMOCER material directly applying high elastic coefficient in the grid region of fiber grating is as strain transducer; At fiber grating and treat between geodesic structure, to form uniform adhesive linkage by setting tool as shown in Figure 1, the grid region of fiber grating is closely bonded and realizes drawing/the measurement of compressive strain at body structure surface to be measured. This kind of measurement draw/the fiber Bragg grating strain sensor structure of compressive strain and installation method, the homogeneity of the bonding glue-line depending on fiber grating and treat between geodesic structure, rubber thickness asymmetry, bubble etc. can cause fiber grating strain uneven, thus the reflectance spectrum causing fiber grating is warbled, affect the accurate measurement of fiber Bragg grating strain sensor. In Fig. 1: chamber 3, fiber Bragg grating strain sensor sectional fixture the 2, two, 1, first chamber, optical fiber groove 4, optical fiber groove 5, clamp area 6, clamp area 7, the longitudinal axis 11 of fiber Bragg grating strain sensor sectional fixture.
Existing can simultaneously measurement draws/compressive strain and the fiber Bragg grating strain sensor structure that reflectance spectrum can be avoided to warble and installation method, only fixed fiber grating two ends and treat geodesic structure, by realizing fiber grating preload stretching strain drawing/compressive strain while measure. When adopting the fiber Bragg grating strain sensor structure of preload stretching strain, fiber grating is produced reinforcement effect by encapsulation structure itself, thus causes the sensitivity decrease of fiber Bragg grating strain sensor and sensitivity consistence poor.
Summary of the invention
It is an object of the invention to overcome the above-mentioned deficiency of prior art, a kind of fiber Bragg grating strain sensor is provided, this fiber Bragg grating strain sensor structure is simple, be easy to processing, material consistence and the requirement on machining accuracy of structure is low, and fiber Bragg grating strain sensor is had high answer sensibility variable and sensitivity consistence.
Another object of the present invention is to provide the installation method of a kind of fiber Bragg grating strain sensor.
The above-mentioned purpose of the present invention is mainly achieved by following technical solution:
A kind of fiber Bragg grating strain sensor, comprises snappiness beam, pillar stiffener, installation substrate, gear sheet and fiber grating, and wherein the first snappiness beam, the first pillar stiffener, the 2nd snappiness beam and the 2nd pillar stiffener are in turn connected to form frame structure; First installation substrate is connected with the first snappiness beam, the 2nd installation substrate is connected with the 2nd snappiness beam, and first install substrate and the 2nd install substrate be all positioned at frame structure outside and with frame structure copline; Fiber grating is fixedly connected with installation substrate, first pillar stiffener or the 2nd pillar stiffener leave opening, in fiber Bragg grating strain sensor encapsulation process and before installing and using, gear sheet is arranged on the first pillar stiffener or the opening place of the 2nd pillar stiffener, ensures that opening size remains unchanged in fiber Bragg grating strain sensor encapsulation process He before installing and using.
In above-mentioned fiber Bragg grating strain sensor, gear sheet is tinsel or wire, or is the bonded adhesives that hot melt or chemical solution are removed.
In above-mentioned fiber Bragg grating strain sensor, bonded adhesives is the cyanoacrylate that acetone soln is removed.
In above-mentioned fiber Bragg grating strain sensor, four angles of the frame structure that the first snappiness beam, the 2nd snappiness beam, the first pillar stiffener and the 2nd pillar stiffener are formed are fillet or right angle.
In above-mentioned fiber Bragg grating strain sensor, fiber grating is bonded in the bottom installing substrate.
The installation method of fiber Bragg grating strain sensor, comprises the steps:
By bonding for installation substrate high elastic coefficient bonded adhesives or be welded on body structure surface to be measured, then removing gear sheet, the Young's modulus of described high elastic coefficient bonded adhesives is greater than 500MPa.
The installation method of fiber Bragg grating strain sensor, comprises the steps:
The two ends high elastic coefficient bonded adhesives that fiber grating is positioned at frame structure is bonded in body structure surface to be measured, then removes gear sheet, installs substrate and frame structure, and the Young's modulus of described high elastic coefficient bonded adhesives is greater than 500MPa.
In the installation method of above-mentioned fiber Bragg grating strain sensor, high elastic coefficient bonded adhesives is epoxy resin or urethane.
In the installation method of above-mentioned fiber Bragg grating strain sensor, gear sheet is tinsel or wire, or is the bonded adhesives that hot melt or chemical solution are removed, and described bonded adhesives is the cyanoacrylate that acetone soln is removed.
In the installation method of above-mentioned fiber Bragg grating strain sensor, the method removing gear sheet is, if gear sheet is tinsel or wire, is removed by gear sheet by applying pulling force from the opening of the first pillar stiffener or the 2nd pillar stiffener; If gear sheet is bonded adhesives, heat fused or acetone solution is adopted to remove.
The present invention compared with prior art has following useful effect:
(1), the structure of fiber Bragg grating strain sensor has been carried out innovative design by the present invention, adopt the structure of snappiness beam, pillar stiffener, installation substrate, gear sheet and fiber grating, by pillar stiffener, sheet is that fiber grating preload strain provides support power with keeping off, and material consistence and requirement on machining accuracy to structure are low;
(2), fiber Bragg grating strain sensor of the present invention by removing gear sheet, the axial strength of fiber Bragg grating strain sensor reduces, and fiber Bragg grating strain sensor is had and high answers sensibility variable and sensitivity consistence;
(3), in fiber Bragg grating strain sensor of the present invention sheet is kept off for metal, sheet will be kept off remove from pillar stiffener opening by applying pulling force; For Temporary adhesive, heating or acetone solution is adopted to remove, it is possible to select according to different needs, handiness height;
(4), fiber Bragg grating strain sensor structure of the present invention simple, be easy to realize, and installation process is simple, it is possible to adopts and installs integral sensors structure or only install fiber grating, needs to select according to difference, handiness height, practical.
Accompanying drawing explanation
Fig. 1 is the fiber Bragg grating strain sensor installation method schematic diagram of existing direct bonding fiber grating grid region and body structure surface to be measured;
Fig. 2 is fiber Bragg grating strain sensor of the present invention structural representation in encapsulation process and before installing and using;
Fig. 3 is that fiber Bragg grating strain sensor of the present invention is arranged on the structural representation after geodesic structure.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
It is illustrated in figure 2 fiber Bragg grating strain sensor of the present invention structural representation in encapsulation process and before installing and using, fiber Bragg grating strain sensor of the present invention comprises the first snappiness beam 14a, the 2nd snappiness beam 14b, the first pillar stiffener 15a, the 2nd pillar stiffener 15b, the first installation substrate 17a, the 2nd installation substrate 17b, gear sheet 16 and fiber grating 13, wherein the first snappiness beam 14a, the first pillar stiffener 15a, the 2nd snappiness beam 14b and the 2nd pillar stiffener 15b are in turn connected to form frame structure, and four angles of the frame structure of formation can be fillet or right angle.
First installation substrate 17a is connected with the first snappiness beam 14a, the 2nd installation substrate 17b is connected with the 2nd snappiness beam 14b, and first install substrate 17a and the 2nd install substrate 17b be all positioned at frame structure outside and with frame structure copline.
Fiber grating 13 is bonded in the bottom installing substrate 17a, 17b, first pillar stiffener 15a or the 2nd pillar stiffener 15b leaves opening, the present embodiment leaves opening on the first pillar stiffener 15a, before the neutralization of fiber Bragg grating strain sensor encapsulation process is installed and used, gear sheet 16 is arranged on the first pillar stiffener 15a opening place. In the present invention, the first pillar stiffener 15a, the 2nd pillar stiffener 15b and gear sheet 16 provide support power for fiber grating 13 preload stretching strain loads, and ensure that opening size remains unchanged in fiber Bragg grating strain sensor encapsulation process He before installing and using. Gear sheet 16 is tinsel or wire, or is the bonded adhesives that hot melt or chemical solution are removed, and such as bonded adhesives is the cyanoacrylate that acetone soln is removed.
The installation method of fiber Bragg grating strain sensor of the present invention has two kinds, and wherein one method is:
By bonding for installation substrate 17a, 17b high elastic coefficient bonded adhesives or be welded on body structure surface to be measured, then removing gear sheet 16, the Young's modulus of high elastic coefficient bonded adhesives is greater than 500MPa, and such as high elastic coefficient bonded adhesives is epoxy resin or urethane.
In another, method is:
Two ends 18a, 18b high elastic coefficient bonded adhesives that fiber grating 13 is positioned at frame structure is bonded in body structure surface to be measured, then removes gear sheet 16, installs substrate 17a, 17b and frame structure. The Young's modulus of high elastic coefficient bonded adhesives is greater than 500MPa, and such as high elastic coefficient bonded adhesives is epoxy resin or urethane. It is illustrated in figure 3 fiber Bragg grating strain sensor of the present invention and it is arranged on the structural representation after geodesic structure, Fig. 3 gives the diagram removing gear sheet 16.
Gear sheet 16 is tinsel or wire, or is the bonded adhesives that hot melt or chemical solution are removed, and such as bonded adhesives is the cyanoacrylate that acetone soln is removed.
The method of above-mentioned removal gear sheet 16 is: if gear sheet 16 is tinsel or wire, will keep off sheet 16 from the first pillar stiffener 15a opening remove by applying pulling force; If gear sheet 16 is bonded adhesives, heat fused or acetone solution is adopted to remove. After removing gear sheet 16, the axial strength of fiber Bragg grating strain sensor reduces, and obtains and good answers sensibility variable and sensitivity consistence.
The above; the embodiment being only the best of the present invention, but protection scope of the present invention is not limited thereto, any is familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.
The content not being described in detail in specification sheets of the present invention belongs to the known technology of professional and technical personnel in the field.
Claims (10)
1. a fiber Bragg grating strain sensor, comprise fiber grating (13) and substrate (17a, 17b) is installed, wherein fiber grating (13) is fixedly connected with installation substrate (17a, 17b), it is characterized in that: also comprising snappiness beam (14a, 14b), pillar stiffener (15a, 15b) and gear sheet (16), wherein the first snappiness beam (14a), the first pillar stiffener (15a), the 2nd snappiness beam (14b) and the 2nd pillar stiffener (15b) are in turn connected to form frame structure; First installation substrate (17a) is connected with the first snappiness beam (14a), 2nd installation substrate (17b) is connected with the 2nd snappiness beam (14b), and first installation substrate (17a) and the 2nd install substrate (17b) be all positioned at frame structure outside and with frame structure copline; First pillar stiffener (15a) or the 2nd pillar stiffener (15b) leave opening, in fiber Bragg grating strain sensor encapsulation process and before installing and using, gear sheet (16) is arranged on the first pillar stiffener (15a) or the opening place of the 2nd pillar stiffener (15b), ensures that opening size remains unchanged in fiber Bragg grating strain sensor encapsulation process He before installing and using.
2. a kind of fiber Bragg grating strain sensor according to claim 1, it is characterised in that: described gear sheet (16) is tinsel or wire, or is the bonded adhesives that hot melt or chemical solution are removed.
3. a kind of fiber Bragg grating strain sensor according to claim 2, it is characterised in that: described bonded adhesives is the cyanoacrylate that acetone soln is removed.
4. a kind of fiber Bragg grating strain sensor according to claim 1, it is characterised in that: four angles of the frame structure that described first snappiness beam (14a), the 2nd snappiness beam (14b), the first pillar stiffener (15a) and the 2nd pillar stiffener (15b) are formed are fillet or right angle.
5. a kind of fiber Bragg grating strain sensor according to claim 1, it is characterised in that: described fiber grating (13) is bonded in the bottom installing substrate (17a, 17b).
6. the installation method of a kind of fiber Bragg grating strain sensor according to claim 1, it is characterised in that comprise the steps:
To install substrate (17a, 17b) bonding or be welded on body structure surface to be measured with high elastic coefficient bonded adhesives, and then remove gear sheet (16), the Young's modulus of described high elastic coefficient bonded adhesives is greater than 500MPa.
7. the installation method of a kind of fiber Bragg grating strain sensor according to claim 1, it is characterised in that comprise the steps:
The two ends (18a, 18b) that fiber grating (13) is positioned at frame structure are bonded in body structure surface to be measured with high elastic coefficient bonded adhesives, then removing gear sheet (16), install substrate (17a, 17b) and frame structure, the Young's modulus of described high elastic coefficient bonded adhesives is greater than 500MPa.
8. the installation method of a kind of fiber Bragg grating strain sensor according to claim 6 or 7, it is characterised in that: described high elastic coefficient bonded adhesives is epoxy resin or urethane.
9. the installation method of a kind of fiber Bragg grating strain sensor according to claim 6 or 7, it is characterized in that: described gear sheet (16) is tinsel or wire, or being the bonded adhesives that hot melt or chemical solution are removed, described bonded adhesives is the cyanoacrylate that acetone soln is removed.
10. the installation method of a kind of fiber Bragg grating strain sensor according to claim 9, it is characterized in that: the described method removing gear sheet (16) is, if gear sheet (16) is tinsel or wire, will keep off sheet (16) removal from the opening of the first pillar stiffener (15a) or the 2nd pillar stiffener (15b) by applying pulling force; If gear sheet (16) is bonded adhesives, heat fused or acetone solution is adopted to remove.
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| CN201310685222.7A CN103673914B (en) | 2013-12-13 | 2013-12-13 | A kind of fiber Bragg grating strain sensor and installation method thereof |
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| CN201310685222.7A CN103673914B (en) | 2013-12-13 | 2013-12-13 | A kind of fiber Bragg grating strain sensor and installation method thereof |
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| CN103673914B true CN103673914B (en) | 2016-06-01 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8718419B2 (en) * | 2012-08-15 | 2014-05-06 | Siemens Energy, Inc. | Frame foot loading measurement system using fiber optic sensing technique |
| JP6449795B2 (en) * | 2016-01-15 | 2019-01-09 | 日東電工株式会社 | Curing type adhesive sheet |
| CN106840018A (en) * | 2016-11-02 | 2017-06-13 | 北京信息科技大学 | A kind of fiber Bragg grating strain sensor method for packing |
| SI3459811T1 (en) * | 2017-09-22 | 2022-02-28 | Thales Management & Services Deutschland Gmbh | Method of mounting a strain measuring assembly, in particular for an axle counter, and according use |
| CN108225206B (en) * | 2017-12-27 | 2021-06-11 | 北京航天控制仪器研究所 | Reusable fiber grating strain sensor |
| CN108838594B (en) * | 2018-08-23 | 2023-10-27 | 北京通为科技有限公司 | Packaging structure of fiber Bragg grating sensor |
| CN110044288A (en) * | 2019-04-03 | 2019-07-23 | 西北工业大学 | High temperature resistant strain transducer based on FBG |
| CN109883588A (en) * | 2019-04-09 | 2019-06-14 | 薛珣 | A kind of fiber grating force-measuring anchor stock |
| CN112880584A (en) * | 2021-02-09 | 2021-06-01 | 北京航天控制仪器研究所 | High-temperature-resistant strain sensor with fiber bragg grating preloaded compressive stress and preparation method thereof |
| CN114322816A (en) * | 2021-12-31 | 2022-04-12 | 中国空气动力研究与发展中心超高速空气动力研究所 | Mounting glue and application thereof in optical fiber sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2003344183A (en) * | 2002-05-27 | 2003-12-03 | Ntt Advanced Technology Corp | Fiber grating temperature sensor and temperature measurement system |
| CN2651704Y (en) * | 2003-11-04 | 2004-10-27 | 刘育梁 | Fibre-optic raster strain sensor |
| US20070193362A1 (en) * | 2006-02-06 | 2007-08-23 | Ferguson Stephen K | Fiber optic strain gage |
| CN100533056C (en) * | 2007-10-19 | 2009-08-26 | 大连理工大学 | Encapsulation method for optical fibre grating add-and-subtract quick strain sensor |
| CN201266078Y (en) * | 2008-07-18 | 2009-07-01 | 中冶建筑研究总院有限公司 | Optical fiber grating strain sensor |
| CN101570065B (en) * | 2009-06-10 | 2011-08-10 | 沈阳航空工业学院 | Method for manufacturing intelligent composite-material laminates used for monitoring structural longitudinal strain |
| CN202158841U (en) * | 2011-07-08 | 2012-03-07 | 中国飞机强度研究所 | Fiber bragg grating strain transducer |
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