CN108151909A - 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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- CN108151909A CN108151909A CN201711431759.5A CN201711431759A CN108151909A CN 108151909 A CN108151909 A CN 108151909A CN 201711431759 A CN201711431759 A CN 201711431759A CN 108151909 A CN108151909 A CN 108151909A
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- optical fiber
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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
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- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a kind of superelevation temperature sensors based on FBG, including carbon carbon composite pedestal, the top of carbon carbon composite pedestal is fixedly connected with stainless steel tube by the first refractory ceramics blob of viscose, stainless steel tube is internally provided with optical fiber, the inside of stainless steel tube is also fixedly connected with grating, the both ends of optical fiber run through grating and extend to the outside of grating, one end that optical fiber is located at outside stainless steel tube is fixedly connected with APC fibre-optical splices, the top of stainless steel tube and aperture is offered with the corresponding position of grating, be related to technical field of optical fiber sensing.The superelevation temperature sensor based on FBG can realize a wide range of and ultra-high temperature measurement；The II type fiber grating inscribed using the femto-second laser that can bear 1000 DEG C of superhigh temperature, compared with general fiber-optical grating temperature sensor, inventive sensor has many advantages, such as that temperature-measuring range is big, superhigh temperature resistant, overcomes temperature strain cross-sensitivity, can remote monitoring.
Description
Technical field
The present invention relates to technical field of optical fiber sensing, specially a kind of superelevation temperature sensor based on FBG.
Background technology
Sensor is a kind of detection device, can experience measured information, and the information that can will be experienced, by a set pattern
Rule is for conversion into electric signal or the information output of other required forms, to meet the transmission of information, processing, storage, display, record
With control etc. requirements.
Fiber grating as a kind of novel fiber optic passive device, because its with strong interference immunity, it is corrosion-resistant, small,
Connectionless loss, the good characteristics such as multiple spot distributed measurement can be achieved in light-weight, long lifespan, have in sensory field of optic fibre wide
Wealthy application prospect.Common I type fiber grating is only applicable to less than 200 DEG C of working environment, and when temperature is higher than 200 DEG C, it is anti-
It penetrates rate with the rising of temperature to decline, when temperature is more than 300 DEG C, fiber grating generates attenuating effect, until erasing.And it passes
The fiber-optical grating temperature sensor of system is also limited by encapsulating material；Use operating temperature such as epoxy encapsulation glue is -50
DEG C~180 DEG C.These limit fiber grating and use in a high temperauture environment.
Invention content
(1) the technical issues of solving
In view of the deficiencies of the prior art, it the present invention provides a kind of superelevation temperature sensor based on FBG, solves and works as temperature
During more than 300 DEG C, fiber grating generates attenuating effect, until erasing, and traditional fiber-optical grating temperature sensor is also sealed
The problem of package material limits.
(2) technical solution
In order to achieve the above object, the present invention is achieved by the following technical programs：A kind of superhigh temperature sensing based on FBG
Device, including carbon-carbon composite pedestal, the top of the carbon-carbon composite pedestal is consolidated by the first refractory ceramics blob of viscose
Surely it is connected with stainless steel tube, and stainless steel tube is internally provided with optical fiber, the inside of the stainless steel tube is also fixedly connected with
Grating, the both ends of the optical fiber run through grating and extend to the outside of grating, and the optical fiber is located at one outside stainless steel tube
End is fixedly connected with APC fibre-optical splices, the top of the stainless steel tube and offers aperture with the corresponding position of grating.
Preferably, the inner surface of the stainless steel tube is fixedly connected with the second refractory ceramics blob of viscose, and the second resistance to height
The side of warm ceramics blob of viscose is fixedly connected with one end of optical fiber.
Preferably, the quantity of the aperture is at least four, and four apertures are arranged in a manner of equidistant.
Preferably, the APC fibre-optical splices pass through third refractory ceramics glue and stainless steel close to the side of stainless steel tube
Pipe is fixedly connected.
The invention also discloses a kind of method of works of the superelevation temperature sensor based on FBG, specifically include following steps：
S1, stainless steel tube is fixed on carbon-carbon composite using the first refractory ceramics blob of viscose at distance grating 5mm
On pedestal；
S2, the second refractory ceramics blob of viscose is injected by the aperture on stainless steel tube by II of bragg wavelength for 1550nm
Type FBG optical fiber one end is fixed in stainless steel tube；
S3, optical fiber the other end be connected with APC fibre-optical splices, and using third refractory ceramics glue by APC fibre-optical splices
It is connected with stainless steel tube；
S4, optical fiber grating sensing are based on its reflection wavelength changes with the variation of extraneous parameter；When wideband light source exists
When being transmitted in fiber grating, Mode Coupling is generated, and analyzing and processing is detected to it.
Preferably, described according to the fiber coupling theory of modules, the light wave λ B for meeting Bragg condition are reflected, commplementary wave length
Light wave is transmitted, and is had：
λB=2neffΛ (1)
In formula：Λ is the period of grating；Neff is the effective refractive index of grating.When the parameters such as temperature, stress change
When, it will lead to the variation of Λ and neff, the variation so as to cause λ B has：
ΔλB=2 Δ neffΛ+2neffΔΛ (2)
The operation principle of FBG ultra-high temperature sensors proposed is to measure the change of bragg wavelength, and this change is
By caused by the strain as caused by temperature.
The opposite changes delta λ B of bragg wavelengths B are：
In formula (3),For germanium-doped silica fiber, α is takenf=0.5 × 10-6/ DEG C, ξ=7.0
×10-6/ DEG C, then above formula (3) is expressed as：
(3) advantageous effect
The present invention provides a kind of superelevation temperature sensors based on FBG.Has following advantageous effect：This is super based on FBG
Pyrostat can realize a wide range of and ultra-high temperature measurement；Use the femtosecond laser that can bear 1000 DEG C of superhigh temperature
The II type fiber grating that device is inscribed, and be packaged using the different material of the coefficient of expansion and refractory ceramics glue；The temperature passes
The temperature information on testee surface is converted to internal mechanical force by sensor, is obtained by the Bragg wavelength drift for reading FBG
The temperature value on testee surface is obtained, compared with general fiber-optical grating temperature sensor, inventive sensor has thermometric model
Enclose big, superhigh temperature resistant, overcome temperature strain cross-sensitivity, can remote monitoring the advantages that.
Description of the drawings
Fig. 1 is schematic structural view of the invention；
In figure, 1 carbon-carbon composite pedestal, 2 first refractory ceramics blob of viscoses, 3 stainless steel tubes, 4 optical fiber, 5 gratings,
6APC fibre-optical splices, 7 apertures, 8 second refractory ceramics blob of viscoses, 9 third refractory ceramics glue.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the present invention provides a kind of superelevation temperature sensor based on FBG, as shown in Figure 1, including carbon-carbon composite
Pedestal 1, the top of carbon-carbon composite pedestal 1 is fixedly connected with stainless steel tube 3 by the first refractory ceramics blob of viscose 2, stainless
The coefficient of thermal expansion of steel pipe 3 is internally provided with optical fiber 4, the interior table of stainless steel tube 3 for -17 × 10-6/ DEG C and stainless steel tube 3
Face is fixedly connected with the second refractory ceramics blob of viscose 8, and the side of the second refractory ceramics blob of viscose 8 and one end of optical fiber 4 are consolidated
Fixed connection, the inside of stainless steel tube 3 are also fixedly connected with grating 5, and the both ends of optical fiber 4 through grating 5 and extend to grating 5
Outside, one end that optical fiber 4 is located at outside stainless steel tube 3 are fixedly connected with APC fibre-optical splices 6, and APC fibre-optical splices 6 are close to stainless
The side of steel pipe 3 is fixedly connected by third refractory ceramics glue 9 with stainless steel tube 3, the first refractory ceramics blob of viscose 2, second
The coefficient of thermal expansion of refractory ceramics blob of viscose 8 and third refractory ceramics glue 9 is -4.4 × 10-6/ DEG C, the top of stainless steel tube 3
Portion and aperture 7 is offered with 5 corresponding position of grating, the quantity of aperture 7 is at least four, and four apertures 7 are with equidistant
Mode arrange, aperture 7, which makes to be formed with air in stainless steel tube 3, to circulate, so as to make fiber-optic grating sensor actual response extraneous
Temperature change.
The invention also discloses a kind of method of works of the superelevation temperature sensor based on FBG, specifically include following steps：
S1, using the first refractory ceramics blob of viscose 2 stainless steel tube 3 to be fixed on carbon-to-carbon at distance grating 55mm compound
On susceptor material 1；
S2, the second refractory ceramics blob of viscose 8 is injected by aperture 7 on stainless steel tube 3 by bragg wavelength is 1550nm
II type FBG optical fiber, 4 one end be fixed in stainless steel tube 3；
S3, optical fiber 4 the other end be connected with APC fibre-optical splices 6, and connect APC optical fiber using third refractory ceramics glue 9
First 6 are connected with stainless steel tube 3；
S4, optical fiber grating sensing are based on its reflection wavelength changes with the variation of extraneous parameter；When wideband light source exists
When being transmitted in 4 grating 5 of optical fiber, Mode Coupling is generated, and analyzing and processing is detected to it
Optical fiber grating sensing is based on its reflection wavelength changes with the variation of extraneous parameter.When wideband light source is in optical fiber
When being transmitted in grating, Mode Coupling is generated, according to the fiber coupling theory of modules, the light wave λ B for meeting Bragg condition are reflected,
The light wave of commplementary wave length is transmitted, and is had：
λB=2neffΛ (1)
In formula：Λ is the period of grating 5；Neff is the effective refractive index of grating 5.When the parameters such as temperature, stress become
During change, it will lead to the variation of Λ and neff, the variation so as to cause λ B has：
ΔλB=2 Δ neffΛ+2neffΔΛ (2)
The operation principle of FBG ultra-high temperature sensors proposed is to measure the change of bragg wavelength, and this change is
By caused by the strain as caused by temperature.
The opposite changes delta λ B of bragg wavelengths B are：
In formula (3),For germanium-doped silica fiber, α is takenf=0.5 × 10-6/ DEG C, ξ=7.0
×10-6/ DEG C, then above formula (3) is expressed as：
For the FBG that centre wavelength value is 1550nm, temperature control coefficient theoretical value is about 11.625pm/ DEG C；By
The difference of optical fiber 4, FBG write-in techniques and annealing process in use, the temperature sensitive properties of bare fibre Bragg grating have
Institute is different；By the variation of Detection wavelength with regard to that can detect the temperature change of FBG sensor.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any this practical relationship or sequence.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Non-exclusive inclusion, so that process, method, article or equipment including a series of elements not only will including those
Element, but also including other elements that are not explicitly listed or further include as this process, method, article or equipment
Intrinsic element.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
Understanding without departing from the principles and spirit of the present invention can carry out these embodiments a variety of variations, modification, replace
And modification, the scope of the present invention is defined by the appended.
Claims (6)
1. a kind of superelevation temperature sensor based on FBG, including carbon-carbon composite pedestal (1), it is characterised in that：The carbon-to-carbon
The top of composite material pedestal (1) is fixedly connected with stainless steel tube (3), and stainless by the first refractory ceramics blob of viscose (2)
Steel pipe (3) is internally provided with optical fiber (4), and the inside of the stainless steel tube (3) is also fixedly connected with grating (5), the optical fiber
(4) both ends run through grating (5) and extend to the outside of grating (5), and the optical fiber (4) is positioned at stainless steel tube (3) outside
One end is fixedly connected with APC fibre-optical splices (6), the top of the stainless steel tube (3) and is opened up with grating (5) corresponding position
There is aperture (7).
2. a kind of superelevation temperature sensor based on FBG according to claim 1, it is characterised in that：The stainless steel tube (3)
Inner surface be fixedly connected with the second refractory ceramics blob of viscose (8), and the side of the second refractory ceramics blob of viscose (8) and optical fiber
(4) one end is fixedly connected.
3. a kind of superelevation temperature sensor based on FBG according to claim 1, it is characterised in that：The number of the aperture (7)
Amount is at least four, and four apertures (7) are arranged in a manner of equidistant.
4. a kind of superelevation temperature sensor based on FBG according to claim 1, it is characterised in that：The APC fibre-optical splices
(6) it is fixedly connected close to the side of stainless steel tube (3) by third refractory ceramics glue (9) with stainless steel tube (3).
5. a kind of method of work of the superelevation temperature sensor based on FBG, it is characterised in that：Specifically include following steps：
S1, it stainless steel tube (3) is fixed on carbon-to-carbon using the first refractory ceramics blob of viscose (2) at distance grating (5) 5mm answers
On condensation material pedestal (1)；
S2, it is by bragg wavelength by aperture (7) the second refractory ceramics blob of viscose (8) of injection on stainless steel tube (3)
II type FBG optical fiber (4) one end of 1550nm is fixed in stainless steel tube (3)；
S3, optical fiber (4) the other end be connected with APC fibre-optical splices (6), and using third refractory ceramics glue (9) by APC optical fiber
Connector (6) is connected with stainless steel tube (3)；
S4, optical fiber grating sensing are based on its reflection wavelength changes with the variation of extraneous parameter；When wideband light source is in optical fiber
(4) in grating (5) during transmission, Mode Coupling is generated, and analyzing and processing is detected to it.
6. a kind of method of work of superelevation temperature sensor based on FBG according to claim 5, it is characterised in that：It is described
According to the fiber coupling theory of modules, the light wave λ B for meeting Bragg condition are reflected, and the light wave of commplementary wave length is transmitted, and is had：
λB=2neffΛ (1)
In formula：Λ is the period of grating (5)；Neff is the effective refractive index of grating (5).When the parameters such as temperature, stress become
During change, it will lead to the variation of Λ and neff, the variation so as to cause λ B has：
ΔλB=2 Δ neffΛ+2neffΔΛ (2)
The operation principle of FBG ultra-high temperature sensors proposed is to measure the change of bragg wavelength, and this change is to pass through
Caused by the strain as caused by temperature；
The opposite changes delta λ B of bragg wavelengths B are：
In formula (3),For germanium-doped silica fiber, α is takenf=0.5 × 10-6/ DEG C, ξ=7.0 ×
10-6/ DEG C, then above formula (3) is expressed as：
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711431759.5A CN108151909A (en) | 2017-12-26 | 2017-12-26 | A kind of superelevation temperature sensor based on FBG |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711431759.5A CN108151909A (en) | 2017-12-26 | 2017-12-26 | A kind of superelevation temperature sensor based on FBG |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110646115A (en) * | 2019-09-16 | 2020-01-03 | 江苏卓然智能重工有限公司 | FBG temperature monitoring device for prestress extension of quenching heat exchanger |
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| KR20050107383A (en) * | 2005-10-28 | 2005-11-11 | 한국유지관리 주식회사 | Fine adjustable housing for fiber bragg grating sensors |
| GB2441868A (en) * | 2006-09-12 | 2008-03-19 | Weatherford Lamb | Optical fibre sensor |
| CN101738269A (en) * | 2009-11-13 | 2010-06-16 | 韩红远 | Method for encapsulating optical fiber Bragg grating temperature sensor |
| CN202757707U (en) * | 2012-08-28 | 2013-02-27 | 中国船舶重工集团公司第七一五研究所 | Rapid response high sensitivity fiber grating temperature sensor |
| CN106546182A (en) * | 2016-11-03 | 2017-03-29 | 北京信息科技大学 | A kind of high-temperature resistant optical fiber grating strain transducer of incline structure |
| CN106546354A (en) * | 2016-11-03 | 2017-03-29 | 北京信息科技大学 | A kind of superelevation temperature sensor based on FBG |
-
2017
- 2017-12-26 CN CN201711431759.5A patent/CN108151909A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050107383A (en) * | 2005-10-28 | 2005-11-11 | 한국유지관리 주식회사 | Fine adjustable housing for fiber bragg grating sensors |
| GB2441868A (en) * | 2006-09-12 | 2008-03-19 | Weatherford Lamb | Optical fibre sensor |
| CN101738269A (en) * | 2009-11-13 | 2010-06-16 | 韩红远 | Method for encapsulating optical fiber Bragg grating temperature sensor |
| CN202757707U (en) * | 2012-08-28 | 2013-02-27 | 中国船舶重工集团公司第七一五研究所 | Rapid response high sensitivity fiber grating temperature sensor |
| CN106546182A (en) * | 2016-11-03 | 2017-03-29 | 北京信息科技大学 | A kind of high-temperature resistant optical fiber grating strain transducer of incline structure |
| CN106546354A (en) * | 2016-11-03 | 2017-03-29 | 北京信息科技大学 | A kind of superelevation temperature sensor based on FBG |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110646115A (en) * | 2019-09-16 | 2020-01-03 | 江苏卓然智能重工有限公司 | FBG temperature monitoring device for prestress extension of quenching heat exchanger |
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Application publication date: 20180612 |