CN109708586A - A kind of packaging method of optical fibre Bragg optical grating strain sensor - Google Patents
A kind of packaging method of optical fibre Bragg optical grating strain sensor Download PDFInfo
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- CN109708586A CN109708586A CN201811653810.1A CN201811653810A CN109708586A CN 109708586 A CN109708586 A CN 109708586A CN 201811653810 A CN201811653810 A CN 201811653810A CN 109708586 A CN109708586 A CN 109708586A
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Abstract
The invention belongs to fiber sensor measuring fields, a kind of packaging method of optical fibre Bragg optical grating strain sensor is disclosed, it is characterized by comprising the following steps: 1) carry out mechanical simulation analysis to the grating fibers strain transducer before the encapsulation of grating fibers strain transducer；2) the grating fibers strain transducer encapsulation；3) the grating fibers strain transducer calibration.Can precise measurement environment temperature, and demarcated in laboratory environment pair of strain sensors, test sensor Compression and Expansion performance.Strain can effectively be transmitted using substrate formula packaging method, realize strain measurement.
Description
Technical field
The invention belongs to fiber-optic grating sensor fields of measurement, and in particular to a kind of optical fibre Bragg optical grating strain sensor
Packaging method.
Background technique
The development of aircraft industry and the increase of aircraft task difficulty, so that the use condition of aircraft and receiving environment are more next
It is more complicated.The method that " certainty threshold value " based on historical experience covers various random factors and influence is incomplete.It closes
The Aircraft Load parameter testing of reason is lengthened the life etc. and to be had for determining structure design, determining the longevity to ensureing that flight safety is most important
Important meaning.
In material property and structural mechanical property field, strain measurement is most important test index.The knot of aircraft wing
The problem of detection of structure stress, electrical measuring method have been commonly used, and a large amount of test point is brought as number of cables is more, weight
Greatly, it is not easy later maintenance, electromagnetism interference is in addition unable to and the service life is shorter.Therefore, new measurement method is constantly attempted application
In Aircraft Load parameter testing.Fiber-optic grating sensor measurement is simple with structure, is easy to networking, electromagnetism interference, high survey
The advantages that accuracy of measurement, Wavelength-encoding, meets the final requirement of Aircraft Load parameter testing, there is very big application prospect.
Certain substantial progress, but pass non-sensitive for part on Flight Vehicle Structure are achieved to Aircraft Load test at present
The strain measurement of bond structure does not have effective measurement method.
Summary of the invention
The purpose of the present invention is to solve this problem, providing one kind being capable of precise measurement structural member in a certain range
The packaging method of the substrate formula optical fibre Bragg optical grating strain sensor of strain, can precise measurement environment temperature, reach decoupling
Purpose, and demarcated in laboratory environment pair of strain sensors, test sensor Compression and Expansion performance.Using novel base
Chip package method can effectively transmit strain, realize strain measurement.
For achieving the above object, the technical scheme is that
A kind of packaging method of optical fibre Bragg optical grating strain sensor, which comprises the steps of: 1) grating
Before fibre optic strain sensor encapsulation, mechanical simulation analysis is carried out to the grating fibers strain transducer；
2) the grating fibers strain transducer encapsulation；
3) the grating fibers strain transducer calibration.
Preferably, mechanical simulation is analyzed, and steps are as follows, and 11, which carry out gridding to sensor with finite element method, draws
Point；12 simulation extension test loading procedures fix sensor substrate one end, and the other end applies pulling force and stretched, and are simulated with this
When adhering to the measured object surface from tensile of sensor, the stress of sensor.
Preferably, in the strain transducer encapsulation process, steps are as follows, and 21, by adjustable optic fibre fixture, apply pre-
Clamp force increases two fiber bragg grating center wavelengths, epoxide-resin glue is smeared at sensor substrate A, B, using full coverage type
It encapsulates at sensor substrate C, for measuring temperature parameters；22 after the completion of dispensing, installs the biography of fiber grating under room temperature state additional
Sensor substrate stands setting time, is then socketed fiber optic protection casing and fixation, high-temperature decoupling essence in sensor base two sides
The encapsulation for spending enhanced sensitivity formula strain fiber-optic grating sensor is completed.
Preferably, the strain transducer calibration, steps are as follows, and 31 build test sensor enhanced sensitivity pilot system, uses
MTS cupping machine using KYOWA foil gauge acquisition numerical value as standard strain value, and sets up half-bridge a pair using resistance strain gage
One compensation circuit is compared with the naked mounted packaged fiber grating strain transducer in same level section；32 will answer in high precision
Become tester and high speed optic fiber grating demodulation module and LabVIEW software is write by host computer, realizes strain transducer in
The long synchronous acquisition storage of cardiac wave；33 in collection process, program-controlled setting cupping machine, under conditions of giving initial tensile force
It is incremented by pulling force step by step, does two tension and compression circulations by reading foil gauge output numerical value and survey the relationship between pulling force and strain.
Compared with prior art, the beneficial effects of the present invention are:
Improved in the technique of traditional strain transducer, can simultaneously precise measurement environment temperature, reach
The purpose of decoupling, and demarcated in laboratory environment pair of strain sensors, test sensor Compression and Expansion performance.Using novel
Substrate formula packaging method, realize strain measurement.Base material chooses the preferable aerolite 7075-T6 of Compression and Expansion
Base material can effectively transmit strain, achieve the purpose that measure enhanced sensitivity.The temperature decouples enhanced sensitivity formula strain transducer can
Effectively reliable accurate means of testing is provided for wing structure Compression and Expansion.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows and meets implementation of the invention
Example, and be used to explain the principle of the present invention together with specification.
Fig. 1 is the sensor base schematic diagram of optical fibre Bragg optical grating strain sensor of the present invention；
Fig. 2 is the encapsulation schematic diagram of optical fibre Bragg optical grating strain sensor of the present invention.
Fig. 3 is the gridding schematic diagram of optical fibre Bragg optical grating strain sensor of the present invention.
The calibration experiment system diagram of Fig. 4 optical fibre Bragg optical grating strain sensor of the present invention.
The pulling force and tension test part strain curve figure of Fig. 5 embodiment of the present invention.
The pulling force and enhanced sensitivity formula strain transducer central wavelength graph of relation of Fig. 6 embodiment of the present invention.
The pulling force and fiber bragg grating center wavelength offset graph of relation of Fig. 7 embodiment of the present invention.
Fig. 8 is the strain transducer repeatability aberration curve figure of the embodiment of the present invention.
Specific embodiment
Below in conjunction with attached drawing, technical scheme in the embodiment of the invention is clearly and completely described.
As shown in Figs 1-4, a kind of optical fibre Bragg optical grating strain sensor includes the following steps: 1) grating fibers strain
Before sensor encapsulation, mechanical simulation analysis is carried out to the grating fibers strain transducer；
Fiber Bragg grating strain sensor structure as shown in Figure 1.As shown in figure 3, mechanical simulation is analyzed, steps are as follows, and 11 use
Finite element method carries out gridding division to sensor；12 simulation extension test loading procedures keep sensor substrate one end solid
Fixed, the other end applies pulling force and is stretched, and is simulated with this when adhering to the measured object surface from tensile of sensor, sensor
Stress.
Load is applied to substrate and carries out finite element analysis.According to stress cloud atlas, it can be concluded that, tensile stress occurs for sensor
When variation, the special shape of substrate concentrates on substrate deformation between A, B two o'clock, forms stress and concentrates, not will receive biography at C
Sensor stretches bring any influence, i.e., any deformation does not occur.From the angle of force analysis, it is believed that the sensor base
Design can reach expected purpose.
2) the grating fibers strain transducer encapsulation；
As shown in Fig. 2, steps are as follows in the strain transducer encapsulation process, 21, by adjustable optic fibre fixture, apply
Pretightning force makes two fiber bragg grating center wavelengths increase 1nm, and DP420 epoxide-resin glue is smeared at sensor substrate A, B, is adopted
At full coverage type encapsulation sensor substrate C, for measuring temperature parameters；22 after the completion of dispensing, installs light additional under room temperature state
The sensor substrate of fine grating stands setting time 24 hours, is then socketed fiber optic protection casing in sensor base two sides and consolidates
Fixed, the encapsulation that high-temperature decouples precision enhanced sensitivity formula strain fiber-optic grating sensor is completed；The lesser fiber grating of central wavelength is adopted
It is encapsulated with full coverage type.
According to theory analysis and purpose of design, sensor is pasted onto testee surface, at affixed points D, E two, then increases
Quick multiple is LDE/LAB.
3) the grating fibers strain transducer calibration.
The strain transducer calibration, steps are as follows, and 31 build test sensor enhanced sensitivity pilot system, is stretched using MTS
Testing machine, using KYOWA foil gauge acquisition numerical value as standard strain value, and it is one-to-one compensation using resistance strain gage establishment half-bridge
Circuit is compared with the naked mounted packaged fiber grating strain transducer in same level section；32 by high-precision strain testing instrument
And high speed optic fiber grating demodulation module writes LabVIEW software by host computer, realizes strain transducer and central wavelength
Synchronous acquisition storage；33 in collection process, and program-controlled setting cupping machine is incremented by step by step under conditions of giving initial tensile force
Pulling force does two tension and compression circulations by reading foil gauge output numerical value and surveys the relationship between pulling force and strain.
In order to test sensor effect of enhanced sensitivity, if Fig. 4 shows, the fiber Bragg grating strain sensor calibration enhanced sensitivity test is built
System is to be attached to same level section high-precision KYOWA foil gauge acquisition numerical value with sensor using MTS cupping machine
Standard strain value, and the one-to-one compensation circuit of half-bridge is set up using same performance resistance strain gage, it is naked with same level section
Mounted packaged fiber grating strain transducer compares.
During strain transducer and the synchronous acquisition of central wavelength, according to the Young's modulus and cross of tension test part
Cross-sectional dimension applies the clamping pulling force of 8000N, reaches and need microstrain value.Sigma high-precision strain testing instrument is chosen, most
Small resolution ratio 1 μ ε, maximum frequency acquisition 500Hz；MTS cupping machine, maximum pull 250000N；Temperature calibration link is same
Flat wideband light source and Ibsen high speed optic fiber grating (FBG) demodulator；No. 45 steel are tensioning member.
In the case of obtaining continuous time, changing rule synchronous with central wavelength is strained, Sigma high-precision is strained
Tester and Ibsen high speed (FBG) demodulator write LabVIEW software by host computer, realize strain transducer and central wavelength
Synchronous acquisition storage.
If Fig. 5 shows in collection process, program-controlled setting cupping machine, under conditions of giving initial 2000N pulling force, with
1000N, which is stepping, is incremented to 10000N step by step, is drawn-pressure-draws-presses two circulations, real by reading foil gauge output numerical value
Survey the relationship between pulling force and strain, fitting function formula 1 are as follows:
ε=0.065F-33.635；R2=0.999 (1)
During investigating effect of enhanced sensitivity, the linearity and the repeatability of enhanced sensitivity formula strain transducer, answered with enhanced sensitivity formula
The same cross-section location for becoming sensor is pasted with the different naked mounted fiber Bragg grating strain sensor of central wavelength, obtains not enhanced sensitivity
In the case of fiber grating survey strain sensitivity coefficient, while using serial temperature compensated optical fiber grating method, exclude temperature
Influence of the parameter to test result.Ambient temperature effect is excluded by algorithm, value of thrust and enhanced sensitivity formula strain transducer are reflected
Central wavelength carries out least square fitting, show that its relation curve such as Fig. 6 shows, fitting function and linearity formula 2 be,
λ=9.47 × 10-5F+1537.646；R2=0.999 (2)
Linearity coefficient of determination R2=0.9991, the linearity are good.
Convolution 1, obtain enhanced sensitivity formula strain transducer central wavelength and substrate institute it is strained between relation function formula 3 are as follows:
λ=1.46 × 10-3ε+1537.696 (3)
Effect of enhanced sensitivity and repeatability are to investigate the important indicator of sensor performance, exclude ambient temperature effect by algorithm
Afterwards, two different performance strain transducers acquired reflection kernel wavelength data is recycled in Compression and Expansion twice to carry out at algorithm
Reason, the departure of central wavelength when obtaining stable point fiber grating reflection kernel wavelength and value of thrust 2000N, and carry out respectively most
Small two multiply fitting, investigate the value of two slope of curve multiples and stepping stable case lower pulling force, and fitting function such as Fig. 7 shows, are fitted letter
Numerical expression 4 are as follows:
By analyzing fitting data, enhanced sensitivity formula strain transducer effect of enhanced sensitivity is obvious, reaches 0.095/0.068=1.4 times.
By Fig. 8 to draw a conclusion, enhanced sensitivity formula strain transducer repeats sexual deviation and is no more than ± 5pm, and error is to test result
Bring influences to be no more than 3 μ ε, within the allowable range, it is believed that repeatability is good, and the design is feasible.
Embodiments described above is only a part of the embodiment of the present invention, instead of all the embodiments.Based on this
Embodiment in invention, every other reality obtained by those of ordinary skill in the art without making creative efforts
Example is applied, shall fall within the protection scope of the present invention.
Claims (4)
1. a kind of packaging method of optical fibre Bragg optical grating strain sensor, which comprises the steps of: 1) grating light
Before fine strain transducer encapsulation, mechanical simulation analysis is carried out to the grating fibers strain transducer；
2) the grating fibers strain transducer encapsulation；
3) the grating fibers strain transducer calibration.
2. the packaging method of optical fibre Bragg optical grating strain sensor according to claim 1, which is characterized in that mechanical simulation
Analysis, steps are as follows, and 11 carry out gridding division to sensor substrate with finite element method；12 simulation extension test loads
Process fixes sensor substrate one end, and the other end applies pulling force and stretched, and when simulating measured object surface from tensile, is tested
The stress of object surface adhesion sensor substrate.
3. the packaging method of optical fibre Bragg optical grating strain sensor according to claim 1, which is characterized in that second step,
In strain transducer encapsulation process, steps are as follows, and 21 by adjustable optic fibre fixture, and applying pretightning force makes two fiber grating centers
Wavelength increases, and epoxide-resin glue is smeared at sensor substrate A, B, at full coverage type encapsulation sensor substrate C, is used to
Measure temperature parameters；22 after the completion of dispensing, and the sensor substrate for installing fiber grating under room temperature state additional stands setting time, with
It is socketed fiber optic protection casing and fixation in sensor base two sides afterwards, high-temperature decouples precision optical fiber grating enhanced sensitivity formula strain sensing
The encapsulation of device is completed.
4. the packaging method of optical fibre Bragg optical grating strain sensor according to claim 1, which is characterized in that third step,
Transducer calibration, 31 build test sensor enhanced sensitivity pilot system, using MTS cupping machine, acquire number with KYOWA foil gauge
Value is standard strain value, and sets up the one-to-one compensation circuit of half-bridge using resistance strain gage, naked mounted with same level section
Packaged fiber grating strain transducer compares；32 lead to high-precision strain testing instrument and high speed optic fiber grating demodulation module
It crosses host computer and writes LabVIEW software, realize the synchronous acquisition storage of strain transducer and central wavelength；33 in collection process
In, program-controlled setting cupping machine is incremented by pulling force step by step under conditions of giving initial tensile force, does two tension and compression circulations, passes through
Foil gauge output numerical value is read, the relationship between pulling force and strain is surveyed.
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| CN201811653810.1A CN109708586A (en) | 2018-12-29 | 2018-12-29 | A kind of packaging method of optical fibre Bragg optical grating strain sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111735714A (en) * | 2020-06-09 | 2020-10-02 | 西北工业大学 | High-temperature full-stress-strain curve testing method and device based on optical fiber |
| CN112043248A (en) * | 2020-09-03 | 2020-12-08 | 山东大学 | Flexible pulse feeling hand and traditional Chinese medicine pulse feeling instrument |
| CN114608635A (en) * | 2022-03-07 | 2022-06-10 | 广州大学 | Reusable microarray self-adhesion optical fiber sensor and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106482760A (en) * | 2015-10-14 | 2017-03-08 | 北京信息科技大学 | A kind of system of all-metal packaged fiber grating strain transducer |
| 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 |
-
2018
- 2018-12-29 CN CN201811653810.1A patent/CN109708586A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106482760A (en) * | 2015-10-14 | 2017-03-08 | 北京信息科技大学 | A kind of system of all-metal packaged fiber grating strain transducer |
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| 张开宇 等: "温度解耦增敏式光纤光栅应变传感器", 《光学精密工程》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111735714A (en) * | 2020-06-09 | 2020-10-02 | 西北工业大学 | High-temperature full-stress-strain curve testing method and device based on optical fiber |
| CN112043248A (en) * | 2020-09-03 | 2020-12-08 | 山东大学 | Flexible pulse feeling hand and traditional Chinese medicine pulse feeling instrument |
| CN112043248B (en) * | 2020-09-03 | 2021-07-20 | 山东大学 | Flexible pulse feeling hand and traditional Chinese medicine pulse feeling instrument |
| CN114608635A (en) * | 2022-03-07 | 2022-06-10 | 广州大学 | Reusable microarray self-adhesion optical fiber sensor and preparation method thereof |
| CN114608635B (en) * | 2022-03-07 | 2023-11-21 | 广州大学 | Reusable microarray self-adhesive optical fiber sensor and preparation method thereof |
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