CN106546354A - A kind of superelevation temperature sensor based on FBG - Google Patents
A kind of superelevation temperature sensor based on FBG Download PDFInfo
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- CN106546354A CN106546354A CN201610953668.7A CN201610953668A CN106546354A CN 106546354 A CN106546354 A CN 106546354A CN 201610953668 A CN201610953668 A CN 201610953668A CN 106546354 A CN106546354 A CN 106546354A
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- aluminium oxide
- oxide ceramics
- temperature sensor
- fiber grating
- fbg
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/3206—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres at discrete locations in the fibre, e.g. using Bragg scattering
Abstract
The invention provides a kind of superelevation temperature sensor based on FBG, wherein, the superelevation temperature sensor based on FBG includes：APC fibre-optical splices, aluminium oxide ceramics rod, stainless steel bar, fiber grating, metal spring and aluminium oxide ceramics protective case；The APC fibre-optical splices are connected with the aluminium oxide protective case by the refractory ceramics glue; one end of the fiber grating is fixed on the free end of the aluminium oxide ceramics rod; the other end is fixed on one end of the aluminium oxide ceramics protective case; the aluminium oxide ceramics rod is inserted in the aluminium oxide ceramics protective case, is supplied to the axial tensile force of fiber grating using the metal spring and experiences temperature change between the aluminium oxide ceramics rod and the aluminium oxide ceramics protective case.
Description
Technical field
The present invention relates to sensory field of optic fibre, more particularly to a kind of superelevation temperature sensor based on FBG.
Background technology
Generally, fiber grating is used as a kind of new fiber optic passive device, because which has strong interference immunity, corrosion-resistant, body
The good characteristics such as little, the lightweight, life-span length of product, connectionless loss, achievable multiple spot distributed measurement, have in sensory field of optic fibre
Have broad application prospects.Common I type fiber grating is only applicable to less than 200 DEG C of working environment, when temperature is higher than 200 DEG C
Its reflectance declines with the rising of temperature, and when temperature is more than 300 DEG C, fiber grating produces attenuating effect, until erasing.And
And traditional fiber-optical grating temperature sensor is also limited by encapsulating material.Such as the use operating temperature of epoxy encapsulation glue
For -50 DEG C～180 DEG C.These limit fiber grating use in high temperature environments.
Accordingly, it would be desirable to one kind can effectively sensor solving the above problems.
The content of the invention
It is an object of the invention to provide a kind of superelevation temperature sensor based on FBG, can realize on a large scale and superhigh temperature
The measurement of degree.The superelevation temperature sensor based on FBG includes：
The protection of APC fibre-optical splices, aluminium oxide ceramics rod, stainless steel bar, fiber grating, metal spring and aluminium oxide ceramics
Set；
The APC fibre-optical splices are connected with the aluminium oxide protective case by the refractory ceramics glue, the optical fiber light
One end of grid is fixed on the free end of the aluminium oxide ceramics rod, and the other end is fixed on the one of the aluminium oxide ceramics protective case
End, the aluminium oxide ceramics rod is inserted in the aluminium oxide ceramics protective case, the aluminium oxide ceramics rod and the aluminium oxide
The axial tensile force of fiber grating is supplied to using the metal spring between ceramic protective sleeve and temperature change is experienced.
Preferably, the bragg wavelength of the fiber grating is 1550nm.
Preferably, the thermal coefficient of expansion of the stainless steel bar is～17 × 10-6/ DEG C.
Preferably, the thermal coefficient of expansion of the aluminium oxide ceramics rod is～7 × 10-6/ DEG C.
Preferably, the thermal coefficient of expansion of the aluminium oxide ceramics protective case is～7 × 10-6/ DEG C.
Preferably, fixed by refractory ceramics glue between the fiber grating and the aluminium oxide ceramics rod.
Preferably, it is solid by refractory ceramics glue between the fiber grating and the aluminium oxide ceramics protective case
It is fixed.
It should be appreciated that aforementioned description substantially and follow-up description in detail are exemplary illustration and explanation, should not
As the restriction to claimed content of the invention.
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 shows a kind of structural representation of the superelevation temperature sensor based on FBG.
Fig. 2 shows a kind of operation principle schematic diagram of superelevation temperature sensor based on FBG of the present invention.
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 disclosed below；Can by multi-form come
Which is realized.The essence of description is only to aid in the detail of the various equivalent modifications Integrated Understanding present 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.
A kind of structural representation of the superelevation temperature sensor based on FBG is shown.As shown in figure 1,
The invention provides a kind of superelevation temperature sensor 100 based on FBG includes：APC fibre-optical splices 101, aluminium oxide are made pottery
Porcelain rod 102, stainless steel bar 103, fiber grating 104, metal spring 105 and aluminium oxide ceramics protective case 106；The APC light
Fine joint 101 is connected with the aluminium oxide protective case 106 by the refractory ceramics glue 107, and the one of the fiber grating 104
End is fixed on the free end of the aluminium oxide ceramics rod 102, and the other end is fixed on the one of the aluminium oxide ceramics protective case 106
End, the aluminium oxide ceramics rod 102 is inserted in the aluminium oxide ceramics protective case 106, the aluminium oxide ceramics rod 102 and institute
State the axial tensile force of fiber grating 104 is supplied to using the metal spring 105 between aluminium oxide ceramics protective case 106 and feel
By temperature change, between the fiber grating 104 and the aluminium oxide ceramics rod 102, paste solid by refractory ceramics glue 107
It is fixed；Pasted by refractory ceramics glue 107 between the fiber grating 104 and the aluminium oxide ceramics protective case 106 and fixed.
Preferably, the bragg wavelength of the fiber grating 104 is 1550nm.
Preferably, the thermal coefficient of expansion of the stainless steel bar 1003 is～17 × 10-6/ DEG C.
Preferably, the thermal coefficient of expansion of the aluminium oxide ceramics rod 102 is～7 × 10-6/ DEG C.
Preferably, the thermal coefficient of expansion of the aluminium oxide ceramics protective case 106 is～7 × 10-6/ DEG C.
Based on FBG superelevation temperature sensor operation principle we will elaborate in the following embodiments.
Fig. 2 shows a kind of operation principle schematic diagram of superelevation temperature sensor based on FBG of the present invention.As shown in Fig. 2
Being included based on the superelevation temperature sensor 200 of FBG in the present embodiment：APC fibre-optical splices 201, aluminium oxide ceramics rod
202nd, stainless steel bar 203, fiber grating 204, metal spring 205 and aluminium oxide ceramics protective case 206；The APC optical fiber connects
101 are connected with the aluminium oxide protective case 206 by the refractory ceramics glue 207, and one end of the fiber grating 204 is solid
The free end of the aluminium oxide ceramics rod 202 is scheduled on, the other end is fixed on one end of the aluminium oxide ceramics protective case 106, institute
State aluminium oxide ceramics rod 202 to be inserted in the aluminium oxide ceramics protective case 206, the aluminium oxide ceramics rod 202 and the oxygen
Change the axial tensile force of fiber grating 204 is supplied to using the metal spring 205 between aluminum ceramic protective sleeve 206 and experience temperature
Degree change, is pasted by refractory ceramics glue 207 between the fiber grating 204 and the aluminium oxide ceramics rod 202 and is fixed；Institute
State to paste by refractory ceramics glue 207 between fiber grating 104 and the aluminium oxide ceramics protective case 206 and fix.
Fiber grating 204 in the embodiment is II type fiber grating, and bragg wavelength is 1550nm, the fiber grating
204 one end is fixed on the free end of aluminium oxide ceramics rod 202, and the other end is connected to one end of aluminium oxide ceramics protective case 206,
Pasted with high-temperature ceramicss glue 207 respectively and fixed.Thermal coefficient of expansion is～17 × 10-6/ DEG C of stainless steel bar 203 and thermal coefficient of expansion
For～7 × 10-6/ DEG C of aluminium oxide ceramics rod 202, it is inserted into the aluminium oxide ceramics that thermal coefficient of expansion is～7 × 10-6/ DEG C and protects
In sheath 206.Testee 208 is pasted onto into the oxidation of the superelevation temperature sensor 200 based on FBG by high-temperature ceramicss glue 207
The side of aluminum ceramic protective sleeve 206, the length of testee is 250mm.
Optical fiber grating sensing is by its reflection wavelength based on the change of extraneous parameter changes.When wideband light source is in optical fiber
When transmitting in grating, Mode Coupling is produced, according to the fiber coupling theory of modules, the light wave λ of Bragg condition is metBReflected, its
The light wave of commplementary wave length is transmitted, and has
λB=2neffΛ (1)
In formula：Cycles of the Λ for grating；neffFor the effective refractive index of grating.When the parameters such as temperature, stress change
When, it will cause Λ and neffChange, so as to cause λBChange have
ΔλB=2 Δ neffΛ+2neffΔΛ (2)
The operation principle of the FBG ultra-high temperature sensors for being proposed is to measure the change of bragg wavelength, and this change is
By caused by the strain that caused by temperature.
Bragg wavelengthsBRelative changes delta λBFor
ΔλB=λB(1-pe)Δε (3)
In formula：peIt is the elasto-optical coefficient of fiber grating, for silica fibre, generally 0.22；
After the temperature that sensor experiences testee 208 affects, sensing element causes FBG to produce axial strain
Can be obtained by formula (3) and formula (4)
Wherein L is the length that glue seals sensor.The parameter of sensor shown in Fig. 2 is respectively, L=25mm, sensing element
Effective length Leff=20mm, reflected wavelength lambda B=1550nm of II type FBG, the elasto-optical coefficient Pe=0.22 of II type FBG, oxidation
Thermalexpansioncoefficientα 1=～7 of aluminium bar × 10-6/ DEG C, thermalexpansioncoefficientα 2=～17 of stainless steel bar × 10-6/ DEG C.
As the thermal coefficient of expansion of aluminium oxide is less than rustless steel, aluminium oxide is compared, the thermal expansion of stainless steel bar is larger.Cause
FBG produces axial strain.When the maximum temperature for applying is 1000 DEG C, the relative displacement that the free end of alumina rod is produced is
200μm.The maximum strain for being applied to the 25mm optical fiber comprising FBG is 8000 μ ε.The maximum of the wavelength shift at 1000 DEG C can be obtained
Value is about 9.6nm, about 9.6pm/ DEG C of the temperature control of sensor probe.
Beneficial effects of the present invention at least that：
The II type fiber grating inscribed using the femto-second laser that can bear 1000 DEG C of superhigh temperature, and utilize the coefficient of expansion
Different materials and high-temperature ceramicss glue are packaged.The temperature information on testee surface is converted to inside by the temperature sensor
Mechanical force, have the advantages that temperature-measuring range big, superhigh temperature resistant, overcome temperature strain cross-sensitivity, can remote monitoring.
With reference to the explanation and practice of the present invention for disclosing here, the other embodiment of the present invention is for those skilled in the art
All will be readily apparent and understand.Illustrate and embodiment be to be considered only as it is exemplary, the present invention true scope and purport it is equal
It is defined in the claims.
Claims (7)
1. a kind of superelevation temperature sensor based on FBG, wherein, the superelevation temperature sensor based on FBG includes：
APC fibre-optical splices, aluminium oxide ceramics rod, stainless steel bar, fiber grating, metal spring and aluminium oxide ceramics protective case；
The APC fibre-optical splices are connected with the aluminium oxide protective case by the refractory ceramics glue, the fiber grating
One end is fixed on the free end of the aluminium oxide ceramics rod, and the other end is fixed on one end of the aluminium oxide ceramics protective case, institute
State aluminium oxide ceramics rod to be inserted in the aluminium oxide ceramics protective case, the aluminium oxide ceramics rod is protected with the aluminium oxide ceramics
The axial tensile force of fiber grating is supplied to using the metal spring between sheath and temperature change is experienced.
2. the superelevation temperature sensor based on FBG according to claim 1, wherein, the bragg wavelength of the fiber grating
For 1550nm.
3. the superelevation temperature sensor based on FBG according to claim 1, wherein, the thermal coefficient of expansion of the stainless steel bar
For～17 × 10-6/ DEG C.
4. the superelevation temperature sensor based on FBG according to claim 1, wherein, the thermal expansion of the aluminium oxide ceramics rod
Coefficient is～7 × 10-6/ DEG C.
5. the superelevation temperature sensor based on FBG according to claim 1, wherein, the heat of the aluminium oxide ceramics protective case
The coefficient of expansion is～7 × 10-6/ DEG C.
6. the superelevation temperature sensor based on FBG according to claim 1, wherein, the fiber grating and the aluminium oxide
Fixed by refractory ceramics glue between ceramic rod.
7. the superelevation temperature sensor based on FBG according to claim 1, wherein, the fiber grating and the aluminium oxide
Fixed by refractory ceramics glue between ceramic protective sleeve.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108151909A (en) * | 2017-12-26 | 2018-06-12 | 北京信息科技大学 | A kind of superelevation temperature sensor based on FBG |
| CN108151665A (en) * | 2017-12-26 | 2018-06-12 | 北京信息科技大学 | A kind of superhigh temperature resistant strain transducer based on FBG |
| CN108169696A (en) * | 2017-12-27 | 2018-06-15 | 北京信息科技大学 | A kind of magnetic field strength transducer and its performance test methods based on FBG |
| CN113203704A (en) * | 2021-05-11 | 2021-08-03 | 东北大学 | Transformer monitoring and sensing integrated optical fiber sensor and use method |
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| US6366721B1 (en) * | 1999-11-04 | 2002-04-02 | Industrial Technology Research Institute | Tunable optical fiber grating |
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| CN108151909A (en) * | 2017-12-26 | 2018-06-12 | 北京信息科技大学 | A kind of superelevation temperature sensor based on FBG |
| CN108151665A (en) * | 2017-12-26 | 2018-06-12 | 北京信息科技大学 | A kind of superhigh temperature resistant strain transducer based on FBG |
| CN108169696A (en) * | 2017-12-27 | 2018-06-15 | 北京信息科技大学 | A kind of magnetic field strength transducer and its performance test methods based on FBG |
| CN113203704A (en) * | 2021-05-11 | 2021-08-03 | 东北大学 | Transformer monitoring and sensing integrated optical fiber sensor and use method |
| CN113203704B (en) * | 2021-05-11 | 2022-09-27 | 东北大学 | Transformer monitoring and sensing integrated optical fiber sensor and use method |
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| CN106546354B (en) | 2019-03-08 |
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Application publication date: 20170329 Assignee: NINGBO TIANDE INNOVATION INTELLIGENT TECHNOLOGY Co.,Ltd. Assignor: Beijing Information Science & Technology University Contract record no.: X2020990000716 Denomination of invention: An ultra high temperature sensor based on FBG Granted publication date: 20190308 License type: Common License Record date: 20201230 |
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