CN102192763A - Carbon fiber packaged optical fiber Bragg grating sensor and manufacturing method thereof - Google Patents
Carbon fiber packaged optical fiber Bragg grating sensor and manufacturing method thereof Download PDFInfo
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- CN102192763A CN102192763A CN201110135208.0A CN201110135208A CN102192763A CN 102192763 A CN102192763 A CN 102192763A CN 201110135208 A CN201110135208 A CN 201110135208A CN 102192763 A CN102192763 A CN 102192763A
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Abstract
The invention discloses a carbon fiber packaged optical fiber Bragg grating sensor and a manufacturing method thereof. By being packaged in a carbon fiber, the optical fiber Bragg grating has an excellent sensing character and maximum data linearity of 0.99949. The designed sensor has the advantages that the packaging process is simple and the material cost is low. Various individual long-term tests show that the wavelength drifting of the sensor is 0, the repeatability and stability are excellent, and the sensor is fit for large-scale batch production and meets the demand of long-term use.
Description
Technical field
The present invention relates to a kind of optical fiber sensing technology, relate in particular to a kind of fiber Bragg grating sensor.
Background technology
Optical fiber sensing technology is the brand-new technology that forms along with the development of light transmitting fiber and Fibre Optical Communication Technology.The fire prevention of Fibre Optical Sensor, explosion-proof, precision is high, loss is low, volume is little, in light weight, the life-span is long, cost performance is high, reusability is good, response speed is fast, anti-electromagnetic interference (EMI), frequency band range is wide, dynamic range is big, easily be widely used in all trades and professions with advantage such as fibre-optic transmission system (FOTS) composition telemetry network.
Fiber Bragg grating sensor (Fiber Bragg Grating Sensor, FBG) belong to a kind of of Fibre Optical Sensor, sensing process based on fiber grating is by extraneous physical parameter heat transfer agent to be obtained in the modulation of optical fiber Bragg (Bragg) wavelength, is a kind of wavelength-modulated type Fibre Optical Sensor.The sensing mechanism of fiber grating comprises elastic deformation (elastic distortion) and the elasto-optical effect (strain-optic effect) that strain causes, thermal expansion effects that temperature causes (thermo expansion effect) and thermo-optic effect (thermo-optic effect), and the Faraday effect (Faraday effect) that causes of magnetic field, directly responsive based on fiber grating to temperature and strain, can be made into and be used to detect stress, strain, temperature, pressure, vibration, displacement, acceleration, the Fibre Optical Sensor of different kinds of parameters such as inclination angle and optical fiber sensor network.
FBG be the fiber core refractive index along fiber axis to being periodically variable a kind of grating. at present existing all kinds of FBG working sensor principles all can be summed up as to FBG centre wavelength
Measurement, promptly by to causing by external disturbance
The measurement of drift value obtains measured parameter
With fiber core effective refractive index n
EffAnd fiber grating length periods lambda is relevant, promptly
If the centre wavelength that supposition temperature and strain pressure cause is separate, ignore the sensitivity coefficient influence that grating centre wavelength causes
（2）
In the formula:
Sensitivity coefficient for fiber grating strain;
Sensitivity coefficient for fiber-optical grating temperature sensor;
Sensitivity coefficient for fiber grating pressure;
Be temperature change value
Be strain,
Strain and temperature can be regarded as independence, linear superposition to the effect of wavelength as can be seen from formula (2) for change value of pressure. if temperature variation is less in the process of the test, can ignore Temperature Influence, then strain stress can be expressed as the variation about the centre wavelength linearity, below identical.
Various variablees influence the mode of wavelength:
A) mode of strain and pressure change centre wavelength:
1, enlarges or dwindle the grating length cycle
2, produce elasto-optical effect
Wherein axial stress changes the coefficient of the wave length shift formula cause and is:
Change the coefficient of the wave length shift formula that causes by pressure:
With
Be bullet light component of tensor (POCKEL coefficient); υ is the Poisson ratio of fiber optic materials; E is an elastic modulus; N is a refractive index, for a sensor, all keeps constant.Common FBG is 1.55 microns a ripple for wavelength,
, KT=11 pm/ ℃, Kp=-3.0 pm/MPa.
Existing sensor carbon fiber encapsulation mostly is flush type; the installation protection and the debugging in sensor package technology and later stage are complicated; and price is also relatively more expensive; and in order to install and packaging technology easy and the sensor made; its sensitivity does not often reach requirement again; and in the prior art, the data linearity of sensor is also often undesirable, and the environment of above-mentioned encapsulation is had strict restriction.
" research of carbon fibre composite packaging FBG sensor " (Wuhan University of Technology, Liu Deli, 2007.5) disclose the encapsulation of a kind of carbon fibre composite in the prior art, and actual in this article to record sensitivity be 0.7454 pm/ μ ε.
" imbedding the intelligent carbon fiber composite plastic of fiber Bragg grating sensor " (Jilin University's journal (engineering version) 2008.11) discloses a kind of packaged type of flush type carbon fiber composite plastic, records between the sensitivity 0.835-0.864 pm/ μ ε.
" solidifying the optical fibre Bragg optical grating strain sensing characteristics research in CFRP " (Harbin Institute of Technology's journal 2006.10) announced the optical fibre Bragg optical grating strain sensing characteristics that solidifies in CFRP, and actual its linearity that records is 0.9967. to the maximum
Summary of the invention
The present invention is directed to the deficiencies in the prior art, propose fiber Bragg grating sensor of a kind of carbon fiber encapsulation and preparation method thereof.
For solving the problems of the technologies described above, technical scheme of the present invention is as follows:
A kind of fiber Bragg grating sensor of carbon fiber encapsulation comprises carbon fibre material, bragg grating and is used for fixing bragg grating and the binding of carbon fibre material that described carbon fibre material is peanut shape.
As possibility: described carbon fibre material up and down two distance of center circle from greater than 50mm.
As possibility: described carbon fibre material up and down two distance of center circle from being 53mm.
As possibility: the above-mentioned binding that is used for fixing bragg grating and carbon fibre material is a resin glue.
A kind of method for making of fiber Bragg grating sensor of carbon fiber encapsulation is characterized in that:
Comprise the steps:
1) cuts out the shape that is peanut shape at place, carbon fibre material functional areas;
2) binding that is used for fixing bragg grating and carbon fiber is with on the stretching line of symmetry that is fixed on described carbon fibre material functional areas of bragg grating;
3) with another sheet carbon fibre material described bragg grating is covered, and fix with the described binding that is used for fixing bragg grating and carbon fibre material.
As possibility: two distance of center circle up and down of carbon fibre material that are peanut shape in the described step 1) after the cutting are from greater than 50mm.
As possibility: two distance of center circle up and down of carbon fibre material that are peanut shape in the described step 1) after the cutting are from being 53mm.
As possibility: the binding that is used for fixing bragg grating and carbon fibre material in the above-mentioned steps is a resin glue.
Beneficial effect of the present invention:
(1) the present invention has good sensing characteristics, its data linearity reaches as high as 0.99949, the sensor package technology of design is simple, material price is cheap, test for a long time through a plurality of each body, its wave length shift is 0, repeatability and having good stability is fit to large-scale mass production and satisfies the long-term needs that use.
(2) carbon fibre material is adopted in encapsulation of the present invention, makes that the intensity of tested structured material is very little to the sensor influence, compares with structural elements, volume is less, do not influence the characteristic of structural elements, and with the sensor miniaturization time, sensitivity is not affected.
(3) compare with traditional employing multi-layer C FRP structure, under the prerequisite of work simplification, the sensitivity and the linearity increase.
Description of drawings
Fig. 1 is the synoptic diagram of the invention process one;
Fig. 2 is the invention process one test result figure;
Fig. 3 is the result data figure of the invention process one.
Embodiment
The present invention will be further described below in conjunction with the drawings and specific embodiments:
Adopt small-sized sheet carbon fiber packaged fiber grating.The encapsulation specific practice be, take off the carbon fibre material of enough sizes, masking tape paper is convenient to cutting on the NOT-function face, cuts out the carbon fiber sheet of two peanut shape by template.Because carbon fiber sheet requires to cover whole bragg grating, thus two center of circle spacings up and down that require carbon fiber sheet greater than 50mm, but its width can be widened arbitrarily with actual needs.Resin glue is evenly spread upon on the carbon fiber function face, fiber grating applied certain prestress is stretching fixedly to be put into wherein on a slice carbon fiber line of symmetry, then other a slice carbon fiber is covered it, two carbon fibers are fixed got final product in 72 hours then.As long as the sensor and the member to be measured of this encapsulation is fixing, fixing mode can adopt any prior art during application.
Above-mentioned packaging environment is forming of encapsulating under 16.7 ° room temperature normal pressure.
Implement one:
The fiber Bragg grating sensor that the carbon fiber that adopts above-mentioned steps to make encapsulates, two center of circle spacings are 53mm about its carbon fiber sheet as shown in Figure 1, and two radius of a circles are 17mm up and down, and the center section arc radius is 25mm.The resin glue that uses E44 epoxy resin and polyamide to mix according to the 2:1 ratio.
The experiment test step:
(1) with AB glue sensor to be measured is sticked on to go to the bottom and be respectively 1cm, 3cm, long 10cm, on the trapezoidal non-corrosive steel cantilever beam of thick 3mm, and the accurate recording paste position.Whole carbon fiber substrates is sticked on the semi-girder.
(2) treat that AB glue solidifies fully after, connect to measure light path, inject sensor with wideband light source through wire jumper and circulator, again the sensor reflected light is injected spectrometer through circulator, by the spectrometer measurement reflectance spectrum.
(3) apply external force by counterweight to semi-girder.Start from scratch every increase 250g weight measurement once, up to adding the 2000g counterweight.Begin to subtract counterweight then, whenever subtract the 250g weight measurement once, up to subtracting back zero.The wavelength of each survey record spectrum peak correspondence.The spectrum peak wavelength of the process that relatively increases weight and loss of weight process.Simultaneously, the each temperature of measuring of record.
Test result analysis:
By shown in Figure 2, the slope error of test pattern as a result of sensor is about 3%.Slope is 0.881pm/ μ ε, resolution 8.8 μ ε, and precision is 45.8 μ ε, and data are asked the influence 0.003nm of repeatability to precision, and total precision is 45.9 μ ε.Wherein returning stagnant precision in the measuring process is 8%, and reproducibility error is 0.4%, and total precision is about 8%, and the data linearity is 0.99949.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, without departing from the inventive concept of the premise; can also make some improvements and modifications, these improvements and modifications also should be considered within the scope of protection of the present invention.
Claims (8)
1. the fiber Bragg grating sensor of a carbon fiber encapsulation comprises carbon fibre material, bragg grating and is used for fixing bragg grating and the binding of carbon fibre material that it is characterized in that: described carbon fibre material is peanut shape.
2. the fiber Bragg grating sensor of a kind of carbon fiber encapsulation according to claim 1 is characterized in that: described carbon fibre material up and down two distance of center circle from greater than 50mm.
3. the fiber Bragg grating sensor of a kind of carbon fiber encapsulation according to claim 1 is characterized in that: two distance of center circle are from being 53mm about the described carbon fibre material.
4. according to the fiber Bragg grating sensor of any described a kind of carbon fiber encapsulation of claim 1 ~ 3, it is characterized in that: the described binding that is used for fixing bragg grating and carbon fibre material is a resin glue.
5. the method for making of the fiber Bragg grating sensor of a kind of carbon fiber encapsulation according to claim 1 is characterized in that: comprise the steps:
1) cuts out the shape that is peanut shape at place, carbon fibre material functional areas;
2) binding that is used for fixing bragg grating and carbon fiber is with on the stretching line of symmetry that is fixed on described carbon fibre material functional areas of bragg grating;
3) with another sheet carbon fibre material described bragg grating is covered, and fix with the described binding that is used for fixing bragg grating and carbon fibre material.
6. the method for making of the fiber Bragg grating sensor of a kind of carbon fiber encapsulation according to claim 5 is characterized in that: two distance of center circle up and down of carbon fibre material that are peanut shape in the described step 1) after the cutting are from greater than 50mm.
7. the method for making of the fiber Bragg grating sensor of a kind of carbon fiber encapsulation according to claim 5 is characterized in that: two distance of center circle up and down of carbon fibre material that are peanut shape in the described step 1) after the cutting are from being 53mm.
8. according to the method for making of the fiber Bragg grating sensor of any described a kind of carbon fiber encapsulation of claim 5 ~ 7, it is characterized in that: the described binding that is used for fixing bragg grating and carbon fibre material is a resin glue.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104446148A (en) * | 2014-12-18 | 2015-03-25 | 无锡伊诺永利文化创意有限公司 | Formula for preparing environment-friendly board |
| CN104446147A (en) * | 2014-12-18 | 2015-03-25 | 无锡伊诺永利文化创意有限公司 | Preparation formula of environmentally-friendly intelligent panel |
| CN104529256A (en) * | 2014-12-18 | 2015-04-22 | 无锡伊诺永利文化创意有限公司 | Formula for preparing healthy environment-friendly plate |
| CN104529257A (en) * | 2014-12-18 | 2015-04-22 | 无锡伊诺永利文化创意有限公司 | Formula of environment-friendly smart plate |
| CN104529258A (en) * | 2014-12-18 | 2015-04-22 | 无锡伊诺永利文化创意有限公司 | Formula for preparing intelligent environment-friendly plate |
| CN109507453A (en) * | 2018-12-06 | 2019-03-22 | 广州广电计量检测股份有限公司 | A kind of revolving speed calibration system and calibration method based on fiber grating |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104446148A (en) * | 2014-12-18 | 2015-03-25 | 无锡伊诺永利文化创意有限公司 | Formula for preparing environment-friendly board |
| CN104446147A (en) * | 2014-12-18 | 2015-03-25 | 无锡伊诺永利文化创意有限公司 | Preparation formula of environmentally-friendly intelligent panel |
| CN104529256A (en) * | 2014-12-18 | 2015-04-22 | 无锡伊诺永利文化创意有限公司 | Formula for preparing healthy environment-friendly plate |
| CN104529257A (en) * | 2014-12-18 | 2015-04-22 | 无锡伊诺永利文化创意有限公司 | Formula of environment-friendly smart plate |
| CN104529258A (en) * | 2014-12-18 | 2015-04-22 | 无锡伊诺永利文化创意有限公司 | Formula for preparing intelligent environment-friendly plate |
| CN109507453A (en) * | 2018-12-06 | 2019-03-22 | 广州广电计量检测股份有限公司 | A kind of revolving speed calibration system and calibration method based on fiber grating |
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Application publication date: 20110921 |