CN106840018A - A kind of fiber Bragg grating strain sensor method for packing - Google Patents
A kind of fiber Bragg grating strain sensor method for packing Download PDFInfo
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- CN106840018A CN106840018A CN201710133331.6A CN201710133331A CN106840018A CN 106840018 A CN106840018 A CN 106840018A CN 201710133331 A CN201710133331 A CN 201710133331A CN 106840018 A CN106840018 A CN 106840018A
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- 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
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Abstract
The invention provides a kind of fiber Bragg grating strain sensor method for packing, comprise the following steps：Fiber grating is fixed on heating platform using rubber clamp, is stood and is waited fiber bragg grating center wavelength stabilization；Rotation rubber fixture differential head, pretightning force is applied to fiber grating, makes optical fiber exceptionally straight, in the APC heads that one end welding of optical fiber is used to be connected with (FBG) demodulator；Place the substrate above on heating platform, be placed in the grid region of fiber grating is parallel in base groove, and fixed using Kapton Tape；Heating platform temperature as 180 DEG C is set, after the completion of intensification, continues rotation rubber fixture differential head, stopped operating when fiber bragg grating center wavelength increases 3nm, wait sufficient center wavelength accuracy；Base groove is filled using High temperature epoxy resinses 353ND, after waiting 1h, heating platform is closed and is waited it to cool to room temperature, in this course, slowly unload chucking power, and optical grating reflection spectrometry without chirp, without bimodal or multi-peaks phenomenon.
Description
Technical field
It is more particularly to a kind of the present invention relates to a kind of fiber Bragg grating strain sensor for measuring measured object structural deformation
Fiber Bragg grating strain sensor method for packing.
Background technology
Foreign project practice have shown that:Fiber grating sensing technology is the new rank of sensing technology development after relay survey technology
Section.Fiber-optic grating sensor has many advantages, such as small volume, lightweight, flexible side compared with traditional electrical category sensor
Just, essential explosion-proof, electromagnetism interference, anticorrosive, high temperature resistant etc., and the characteristics of because having integrated, intrinsic, inexpensive,
Multiplexing can be concatenated, the accurate and absolute measurement of various physical parameters can be provided by an optical fiber, and their physics is carried
Face and mechanical strength are small, its performance and structure will not be impacted in pasting or being embedded into main body, and can further gather
Into distribution sensing network system, be widely used in the parameters such as stress, strain, temperature to engineering structure, and to the change of structure writing brush,
The real time on-line monitoring of the structural parameters such as crack, globality, is the sensing mode of first-selection in current engineering structure, and it is right that it can meet
The high accuracy of structure monitoring, remote, distributed and chronicity technical requirements.Due to fiber-optic grating sensor have it is above-mentioned all
Many advantages, thus application of the fiber grating in sensory field causes the great interest of people.
In material property and structural mechanical property field, strain measurement is topmost test index, the knot of aircraft wing
Structure stress detects that wherein electrical measuring method has been commonly used, but big with cable weight, it is impossible to the electromagnetism interference and life-span is shorter
The shortcomings of, and fiber-optic grating sensor measurement has the advantages that simple structure, electromagnetism interference, high measurement accuracy, Wavelength-encoding,
Thus have great application prospect.
In actual engineering, it is all to seal that essential fragile fiber grating is packaged protection and improves sensitivity
Fill the research purpose of technique.The packaging technology both at home and abroad to fiber grating all concentrates on bare optical fibers and bare optical gratings encapsulation, flush type at present
Encapsulation, metallization packaged and base chip package.Existing fiber grating strain transducer is general in the case where pulled out condition is measured, and tests model
Enclose big, preferably, but when compression stress is measured, measurement range is small for the linearity, more than certain compression measurement range, optical grating reflection spectrum is surveyed
Amount occurs chirp or Double-peak Phenomenon.
Accordingly, it would be desirable to a kind of fiber Bragg grating strain sensor method for packing, enterprising in the technique of traditional strain transducer
Row is improved, and the strain transducer is demarcated in laboratory environment, tests sensor compression performance, uses the method for packing
Fiber Bragg grating strain sensor can provide effectively reliable means of testing for wing structure Compression and Expansion.
The content of the invention
It is an object of the invention to provide a kind of fiber Bragg grating strain sensor method for packing, the method includes following step
Suddenly：
Fiber grating rubber clamp is fixed on heating platform, is stood and is waited fiber bragg grating center wavelength stabilization；
Rotation rubber fixture differential head, pretightning force is applied to fiber grating, makes the optical fiber for being provided with fiber grating exceptionally straight, in light
Fine one end welding is used to connect the APC heads of (FBG) demodulator；
Place the substrate above on heating platform, be placed in the grid region of fiber grating is parallel in base groove, and use polyamides
Imines adhesive tape is fixed；
Heating platform temperature as 180 DEG C is set, after the completion of intensification, continues rolling clamp differential head, when fiber grating center
Stopped operating during wavelength increase 3nm, wait sufficient center wavelength accuracy；
Base groove is filled using High temperature epoxy resinses 353ND, after waiting one hour, heating platform is closed and is waited it to be down to
Room temperature, in this course, slowly unloads in chucking power, and optical grating reflection spectrometry without chirp, without bimodal or multi-peaks phenomenon.
Preferably, the heating platform, for the hot setting of 353ND.
Preferably, the rubber clamp, for providing the big frictional force that common fiber clamp is not provided.
Preferably, the (FBG) demodulator, the centre wavelength value of fiber grating is read for the moment.
Preferably, the Kapton Tape, for fiber grating to be fixed in base groove, prevents it from being anticipated because of other
Cause outward out of shape.
Preferably, the fiber Bragg grating strain sensor method for packing adopts base chip package, and the base material is from warm
The minimum invar material of swollen contraction coefficients, can effectively transmit strain.
The method for packing that the present invention is provided, form is simple, and transmission efficiency is high, and measurement range is larger, fiber reflection spectrometry
When be not in chirp, without bimodal or multi-peaks phenomenon.The present invention is improved in the technique of traditional strain transducer, and
Laboratory environment is demarcated to sensor, tests sensor compression performance, and the strain transducer can be stretched for wing structure
Compression provides effectively reliable means of testing.
It should be appreciated that foregoing description substantially and follow-up description in detail are exemplary illustration and explanation, should not
As the limitation to claimed content of the invention.
Brief description of the drawings
With reference to the accompanying drawing enclosed, the present invention more purpose, function and advantages are by by the as follows of embodiment of the present invention
Description is illustrated, wherein：
Fig. 1 schematically shows the plan of fiber Bragg grating strain sensor substrate；
Fig. 2 schematically shows the graphics of fiber Bragg grating strain sensor substrate；
Fig. 3 schematically shows fiber Bragg grating strain sensor packing forms；
Fig. 4 schematically shows substrate entirety Ansys simulation stress cloud atlas；
Fig. 5 schematically shows optical fiber Ansys simulation stress cloud atlas；
Fig. 6 schematically shows the fundamental measurement principle of strain transducer demarcation；
Fig. 7 schematically shows substrate fiber bragg grating center wavelength and strain curve figure.
Specific embodiment
By reference to one exemplary embodiment, the purpose of the present invention and function and the side for realizing these purposes and function
Method will be illustrated.However, the present invention is not limited to one exemplary embodiment as disclosed below；Can by multi-form come
It is realized.The essence of specification is only to aid in various equivalent modifications Integrated Understanding detail of the invention.
Hereinafter, embodiments of the invention will be described with reference to the drawings.In the accompanying drawings, identical reference represents identical
Or similar part, or same or like step.
The present invention provides a kind of fiber Bragg grating strain sensor method for packing, and the method is comprised the following steps：
Fiber grating 71 is fixed on heating platform with rubber clamp 5, is stood and is waited the centre wavelength of fiber grating 71 steady
It is fixed；
Rotation rubber fixture differential first 51, pretightning force is applied to fiber grating 71, the optical fiber 7 for being provided with fiber grating is stretched tight
Directly, in one end welding APC heads of optical fiber 7, it is connected on (FBG) demodulator 2；
Substrate 6 is placed on heating platform, is placed in the grid region of fiber grating 71 is parallel in base groove 61, and use
Be fixed on fiber grating 71 in substrate by segment Kapton Tape；
Heating platform temperature as 180 DEG C is set, after the completion of intensification, continues rolling clamp differential first 51, when fiber grating 71
Stopped operating during centre wavelength increase 3nm, wait sufficient center wavelength accuracy；
Whole base groove 61 is filled using High temperature epoxy resinses (353ND) 8, after waiting one hour, heating platform is closed
Wait it to cool to room temperature, in this course, slowly unload in chucking power, and optical grating reflection spectrometry without chirp, without bimodal
Or multi-peaks phenomenon.
Referring to Fig. 1-3, Fig. 1 is the floor map of fiber Bragg grating strain sensor substrate, and Fig. 2 is passed for fiber grating strain
The graphics at base of sensilla bottom, Fig. 3 is fiber Bragg grating strain sensor packing forms schematic diagram.Finite element method is applied earliest
In aerospace field, it is mainly used in solving linear structure problem.Using finite element analysis software Ansys, Solid185 is chosen
Model of Solid Elements, is modeled according to the aluminium alloy of substrate material 7075 and actual size, and wherein Solid185 units are used for structure
Threedimensional solid structure is made, the Solid185 units are defined by 8 nodes, each node there are 3 to be translated along xyz directions
The free degree；The Solid185 units have super-elasticity, stress tempering, creep, large deformation and big adaptability to changes；Use low temperature
Substrate 6 is fixed on measured piece surface by DP420 epoxide-resin glues, and fixed position is shown in A in Fig. 3.
Fig. 4-5 are participated in, substrate formula fiber Bragg grating strain sensor, epoxy resin, optical fiber and testpieces are cut,
Combine, scan mesh generation.The one end of substrate 6 limits tri- displacement freedoms in direction of XYZ, the stretching of other end X-direction, the other end
Apply displacement boundary conditions, obtain substrate 6 and the simulation stress of optical fiber 7 cloud atlas as shown in Figure 4,5, Fig. 4 is substrate entirety Ansys moulds
Intend stress cloud atlas, Fig. 5 is that optical fiber Ansys simulates stress cloud atlas, as seen from the figure：The strain variation that the measuring point of measured piece occurs
Can be effectively passed on the optical fiber in substrate 6, and uniform force.Under the strained situation that measured piece applies 1000 μ ε, optical fiber
The strain size of grating 71 is 1011 μ ε.In summary, method for packing form of the present invention is simple, and transmission efficiency is high, can
Meet more practical engineering applications.
Further, below by laboratory environment to using method for packing of the invention fiber grating strain sensor
Device is demarcated, and tests the compression performance of the strain transducer.
Fig. 6 show the fundamental measurement schematic diagram that the strain transducer is demarcated, wherein, calibration system includes wideband light source
1st, (FBG) demodulator 2, optical fiber circulator 3, rubber clamp differential first 51, the optical fiber 7 and the beam of uniform strength 4 that are provided with fiber grating 71, broadband
Light source 1 is attached by optical fiber circulator 3 with for measuring the (FBG) demodulator 2 of fiber grating reflectance spectrum；The tail end of fiber grating 71
It is connected to observe the spectrometer of fiber grating transmission spectrum；Can change the beam of uniform strength 4 by rotation rubber fixture differential first 51 to apply
Plus specifically strain, equivalent intensities beam 4 applies stress, and stress is delivered to fiber grating 71, is become by demodulating fiber bragg grating center
Change, and then obtain the transitive relation between the centre wavelength of fiber grating 71 and strain.
Specifically, the fiber grating reflectance spectrum three dB bandwidth 0.4nm, grid region length is 10mm, while having carried out reflectance spectrum
The apodization and centre wavelength of left and right secondary lobe are 1539.980nm；The wideband light source 1 uses C+L (1520nm~1595nm) wave band
ASE light sources, power is -55dB；The (FBG) demodulator 2 uses high speed optic fiber grating (FBG) demodulator, and test resolution ratio used is 1pm；
Demarcation uses the beam of uniform strength 4, the μ ε of calibration range 0~1000 to be applied by the first 51 change beam of uniform strength 4 of rotation rubber fixture differential
Plus specific strain.
Specifically, the material that the beam of uniform strength 4 for being used in calibration experiment is selected is aluminium 7075T6, and thickness is 2mm, and length is
28mm, measurement range is 0~1000 μ ε；Micrometer caliper measurement range 25mm, precision 0.01mm, the μ ε of measuring strain precision 0.4.
Specifically, polished measured piece measurement point position along 45 degree of directions of center line using sand paper, and with being impregnated with the nothing of alcohol
Dirt paper wipes polishing point, and substrate 6 is fixed on into measured piece surface using low temperature DP420 epoxide-resin glues, and fixed position is in Fig. 3
Shown in A.Wherein, rotation rubber fixture differential first 51 makes each 0.5mm that rises in the tip of the beam of uniform strength 4 reach maximum measurement model
Enclose, reversely unloaded according to same step, record data.Experiment four times is repeated, data measured is fitted, Fig. 7 show light
Fine raster center wavelength and strain curve, fitting a straight line parameter are as shown in table 1 below, to sum up learn：Loading prestressing force sensing
Cell-average sensitivity 8.515pm/ μ ε, unloading prestressing force sensing unit average sensitivity 8.625pm/ μ ε.According to many measurements
The method averaged, it is believed that the fiber Bragg grating strain sensor sensitivity is 8.57pm/ μ ε.Thus illustrate：Using this hair
The compression performance of the fiber Bragg grating strain sensor of bright method for packing is further improved.
Compared with prior art, using the fiber-optic grating sensor of method for packing of the invention not only in measurement pulled out condition
Under, test scope is big, and the linearity is good, and when compression stress is measured, measurement range becomes big, while during fiber reflection spectrometry
Be not in chirp or Double-peak Phenomenon.
The transducer calibration experimental data processing parameter of table 1
| Fitting a straight line | Slope |
| a+\b+\c+\d+ | 8.51\8.52\8.54\8.49 |
| a-\b-\c-\d- | -8.61\-8.64\-8.63\-8.62 |
The fiber Bragg grating strain sensor method for packing that the present invention is provided, form is simple, and transmission efficiency is high, entirely encapsulates
In journey during fiber reflection spectrometry without chirp, without bimodal or multi-peaks phenomenon.The present invention is in the technique of traditional strain transducer
It is improved, and sensor is demarcated in laboratory environment, test sensor compression performance, the strain transducer can be
Wing structure Compression and Expansion provides effectively reliable means of testing.
With reference to the explanation of the invention and practice that disclose here, other embodiment of the invention is for those skilled in the art
All will be readily apparent and understand.Illustrate and embodiment is to be considered only as exemplary, true scope of the invention and purport are equal
It is defined in the claims.
Claims (6)
1. a kind of fiber Bragg grating strain sensor method for packing, the method is comprised the following steps：
Fiber grating rubber clamp is fixed on heating platform, is stood and is waited fiber bragg grating center wavelength stabilization；
Rotation rubber fixture differential head, pretightning force is applied to fiber grating, makes the optical fiber for being provided with fiber grating exceptionally straight, in optical fiber
One end welding is used to connect the APC heads of (FBG) demodulator；
Place the substrate above on heating platform, be placed in the grid region of fiber grating is parallel in base groove, and use polyimides
Adhesive tape is fixed；
Heating platform temperature as 180 DEG C is set, after the completion of intensification, continues rotation rubber fixture differential head, when fiber grating center
Stopped operating during wavelength increase 3nm, wait sufficient center wavelength accuracy；
Base groove is filled using High temperature epoxy resinses 353ND, after waiting one hour, heating platform is closed and is waited it to be down to room
Temperature, in this course, slowly unloads chucking power.
2. method for packing according to claim 1, it is characterised in that the heating platform is used for the hot setting of 353ND.
3. method for packing according to claim 1, it is characterised in that the rubber clamp is used to provide common fibre clip
The big frictional force that tool is not provided.
4. method for packing according to claim 1, it is characterised in that the (FBG) demodulator is used for the moment and reads fiber grating
Centre wavelength value.
5. method for packing according to claim 1, it is characterised in that the Kapton Tape, for by fiber grating
It is fixed in base groove, prevents it from surprisingly causing because of other out of shape.
6. method for packing according to claim 1, it is characterised in that the fiber Bragg grating strain sensor method for packing is adopted
Substrate formula method for packing, the base material is from the minimum invar material of coefficient of thermal expansion and contraction.
Applications Claiming Priority (2)
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|---|---|---|---|
| CN2016109445688 | 2016-11-02 | ||
| CN201610944568 | 2016-11-02 |
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| CN201710133331.6A Pending CN106840018A (en) | 2016-11-02 | 2017-03-08 | A kind of fiber Bragg grating strain sensor method for packing |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107478364A (en) * | 2017-06-30 | 2017-12-15 | 中国特种设备检测研究院 | A kind of fiber-optic grating sensor applied to single-point stress monitoring |
| CN107907241A (en) * | 2017-12-27 | 2018-04-13 | 北京信息科技大学 | A kind of substrate formula FBG temperature sensitizing sensors and performance test methods |
| CN107907069A (en) * | 2017-12-27 | 2018-04-13 | 北京信息科技大学 | A kind of substrate formula temperature strain measurement FBG sensor and performance test methods |
| CN108838594A (en) * | 2018-08-23 | 2018-11-20 | 北京通为科技有限公司 | The encapsulating structure of fiber-optic grating sensor |
| CN109029512A (en) * | 2018-06-29 | 2018-12-18 | 中国船舶重工集团公司第七〇五研究所 | A kind of fiber-optic grating sensor glass solder package system |
| CN109085680A (en) * | 2018-08-14 | 2018-12-25 | 浙江大学 | A kind of packaging method based on the mechanical micro-nano fiber for drawing cone |
| CN109078815A (en) * | 2018-02-06 | 2018-12-25 | 上海光栅信息技术有限公司 | A kind of fiber grating adhesive curing technique |
| CN109579710A (en) * | 2018-12-26 | 2019-04-05 | 中国航空工业集团公司北京航空精密机械研究所 | A kind of flexible grating installing mechanism with thermal stability |
| CN109612401A (en) * | 2018-12-29 | 2019-04-12 | 北京信息科技大学 | A kind of preparation of temperature decoupling wide range strain transducer |
| CN109612602A (en) * | 2018-12-29 | 2019-04-12 | 北京信息科技大学 | A kind of novel fiber grating temperature sensor and packaging method |
| CN109708586A (en) * | 2018-12-29 | 2019-05-03 | 北京信息科技大学 | A kind of packaging method of optical fibre Bragg optical grating strain sensor |
| CN110044288A (en) * | 2019-04-03 | 2019-07-23 | 西北工业大学 | High temperature resistant strain transducer based on FBG |
| CN111006700A (en) * | 2019-08-15 | 2020-04-14 | 南京邮电大学 | Fiber grating packaging device and packaging method |
| CN112710247A (en) * | 2020-12-08 | 2021-04-27 | 北京信息科技大学 | Surface-pasted fiber grating strain sensor packaging method |
| CN112776237A (en) * | 2020-12-28 | 2021-05-11 | 哈尔滨工业大学 | Pouring type resin-based distributed optical fiber sensor packaging device |
| CN115597742A (en) * | 2022-09-14 | 2023-01-13 | 先进能源科学与技术广东省实验室（Cn） | Fiber grating temperature sensor and manufacturing and calibrating method thereof |
| CN116817783A (en) * | 2023-08-31 | 2023-09-29 | 山东省科学院激光研究所 | Optical fiber strain sensor pre-tightening packaging structure and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107478364A (en) * | 2017-06-30 | 2017-12-15 | 中国特种设备检测研究院 | A kind of fiber-optic grating sensor applied to single-point stress monitoring |
| CN107907241A (en) * | 2017-12-27 | 2018-04-13 | 北京信息科技大学 | A kind of substrate formula FBG temperature sensitizing sensors and performance test methods |
| CN107907069A (en) * | 2017-12-27 | 2018-04-13 | 北京信息科技大学 | A kind of substrate formula temperature strain measurement FBG sensor and performance test methods |
| CN107907241B (en) * | 2017-12-27 | 2020-11-20 | 北京信息科技大学 | Substrate type FBG temperature sensitization sensor and performance testing method |
| CN109078815A (en) * | 2018-02-06 | 2018-12-25 | 上海光栅信息技术有限公司 | A kind of fiber grating adhesive curing technique |
| CN109029512A (en) * | 2018-06-29 | 2018-12-18 | 中国船舶重工集团公司第七〇五研究所 | A kind of fiber-optic grating sensor glass solder package system |
| CN109085680A (en) * | 2018-08-14 | 2018-12-25 | 浙江大学 | A kind of packaging method based on the mechanical micro-nano fiber for drawing cone |
| CN108838594A (en) * | 2018-08-23 | 2018-11-20 | 北京通为科技有限公司 | The encapsulating structure of fiber-optic grating 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 |
| CN109579710A (en) * | 2018-12-26 | 2019-04-05 | 中国航空工业集团公司北京航空精密机械研究所 | A kind of flexible grating installing mechanism with thermal stability |
| CN109708586A (en) * | 2018-12-29 | 2019-05-03 | 北京信息科技大学 | A kind of packaging method of optical fibre Bragg optical grating strain sensor |
| CN109612602A (en) * | 2018-12-29 | 2019-04-12 | 北京信息科技大学 | A kind of novel fiber grating temperature sensor and packaging method |
| CN109612401A (en) * | 2018-12-29 | 2019-04-12 | 北京信息科技大学 | A kind of preparation of temperature decoupling wide range strain transducer |
| CN110044288A (en) * | 2019-04-03 | 2019-07-23 | 西北工业大学 | High temperature resistant strain transducer based on FBG |
| CN111006700A (en) * | 2019-08-15 | 2020-04-14 | 南京邮电大学 | Fiber grating packaging device and packaging method |
| CN112710247A (en) * | 2020-12-08 | 2021-04-27 | 北京信息科技大学 | Surface-pasted fiber grating strain sensor packaging method |
| CN112776237A (en) * | 2020-12-28 | 2021-05-11 | 哈尔滨工业大学 | Pouring type resin-based distributed optical fiber sensor packaging device |
| CN112776237B (en) * | 2020-12-28 | 2023-04-21 | 哈尔滨工业大学 | Pouring type resin-based distributed optical fiber sensor packaging device |
| CN115597742A (en) * | 2022-09-14 | 2023-01-13 | 先进能源科学与技术广东省实验室（Cn） | Fiber grating temperature sensor and manufacturing and calibrating method thereof |
| CN115597742B (en) * | 2022-09-14 | 2024-01-23 | 先进能源科学与技术广东省实验室 | Fiber bragg grating temperature sensor and manufacturing and calibrating method thereof |
| CN116817783A (en) * | 2023-08-31 | 2023-09-29 | 山东省科学院激光研究所 | Optical fiber strain sensor pre-tightening packaging structure and method |
| CN116817783B (en) * | 2023-08-31 | 2023-12-05 | 山东省科学院激光研究所 | Optical fiber strain sensor pre-tightening packaging structure and method |
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Application publication date: 20170613 |