CN207816481U - temperature sensor based on FBG - Google Patents
temperature sensor based on FBG Download PDFInfo
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- CN207816481U CN207816481U CN201721907581.2U CN201721907581U CN207816481U CN 207816481 U CN207816481 U CN 207816481U CN 201721907581 U CN201721907581 U CN 201721907581U CN 207816481 U CN207816481 U CN 207816481U
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Abstract
The utility model discloses a kind of temperature sensors based on FBG, it includes glass bushing, FBG optical fiber, eccentric glass tube, crimp head, protecting pipe, the FBG optical fiber is placed in glass bushing, its both ends is connect with eccentric glass tube respectively, it is respectively equipped with rubber column at the both ends of glass bushing, glass bushing, eccentric glass tube are connected as an entirety by rubber column；It is cased with support column outside glass bushing, and the support column is connect with rubber column；One end of the crimp head is connect with support column, and the other end is connect with protecting pipe.The utility model encapsulates the small, high certainty of measurement of fluctuation simple, affected by environment.
Description
Technical field
The utility model belongs to fiber grating sensing technology field, and in particular to a kind of temperature sensor based on FBG.
Background technology
Bragg fiber grating (FBG, Fiber Bragg Grating) is with the fastest developing speed in recent years, application
One of most commonly used fiber optic passive device.Compared to other sensors, fiber-optic grating sensor has the characteristics that：1) reliable
The good, strong antijamming capability of property.Due to fiber grating pair information measured Wavelength-encoding, not by light source power fluctuation and fibre-optical bending
Etc. system loss caused by factors influence.2) high certainty of measurement.Accurate reflectance signature makes it more accurately reflect to answer
The variation of power and temperature.3) absolute measurement.The wavelength shift of FBG grating sensors provides a kind of absolute measurement, utilizes the spy
Property on-line real time monitoring can be not only carried out to engineering structure, but also structure can be periodically detected.4) sensing head knot
Structure is simple, size is small, is suitable for various application scenarios.5) electromagnetism interference, it is anticorrosive, can work under severe chemical environment.
Due to these unique advantages, FBG has broad application prospects in sensory field of optic fibre.But the existing temperature based on FBG
There are packaging technology complexity for sensor, and fluctuation affected by environment is big, it is easy to aging the problems such as.
Utility model content
The small temperature based on FBG of fluctuation simple, affected by environment that the purpose of this utility model is to provide a kind of encapsulation
Sensor.
Technical solution used by the utility model is：
A kind of temperature sensor based on FBG comprising glass bushing, FBG optical fiber, eccentric glass tube, crimp head, sheath
Pipe, the FBG optical fiber are placed in glass bushing, and both ends are connect with eccentric glass tube respectively, it is ensured that are set the grating region of FBG optical fiber
Among two eccentric glass tubes；It is respectively equipped with rubber column at the both ends of glass bushing, rubber column is by glass bushing, eccentric glass
Pipe is connected as an entirety；It is cased with support column outside glass bushing, and the support column is connect with rubber column；One end of the crimp head
It is connect with support column, the other end is connect with protecting pipe.
When ambient temperature changes, temperature is transferred to by support column in glass bushing, and FBG optical fiber is by temperature
Degree influences that reflection wavelength is made to change, and by (FBG) demodulator supervisory wavelength, temperature is calculated according to the linear relationship of wavelength and temperature
Variation.
By said program, the both ends of the FBG optical fiber are Nian Jie with eccentric glass tube by epoxide-resin glue or ultraviolet glue
Together, and FBG optical fiber is made to be in natural torsion state.FBG optical fiber is silica with eccentric glass tube material itself, by
When being influenced to ambient temperature, two kinds of material bonding portion thermal expansion effects synchronize, i.e., grating region is not influenced by external force.
By said program, the grating region part of the FBG optical fiber avoids and applies at low ambient temperatures without secondary coating
Cladding material expands with heat and contract with cold, and the grating region of FBG optical fiber is influenced by external force, influences measurement accuracy.
By said program, the support column is connect by screw thread with crimp head, there is screw thread fastening glue at screw thread；The crimping
Head is connect with protecting pipe using crimping mode, and fluid sealant is equipped in the junction of crimp head and protecting pipe；Both it is convenient for encapsulation, also makes
Total is obtained more to stablize.
The beneficial effects of the utility model are：
It is packaged using eccentric glass tube, glass bushing, can effectively avoid the influence of FBG optical fiber expanded by heating effects,
Ensure that measurement accuracy；
Only with glass bushing, FBG optical fiber, eccentric glass tube, crimp head, protecting pipe, rubber column, support column, structure letter
Single, encapsulation is convenient.
Description of the drawings
Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing：
Fig. 1 is the structural schematic diagram of the temperature sensor based on FBG；
Fig. 2 is the A-A sectional views of Fig. 1；
Fig. 3 is the assembly technology figure of the temperature sensor based on FBG；
Wherein, 1, glass bushing, 2, FBG optical fiber, 3, eccentric glass tube, 4, crimp head, 5, protecting pipe, 6, rubber column, 7,
Support column, 8, fluid sealant, 9, epoxide-resin glue, 10, screw thread fastening glue.
Specific implementation mode
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only explaining this
Utility model is not used to limit the utility model.
Referring to Fig. 1-Fig. 3, a kind of temperature sensor based on FBG comprising FBG optical fiber 2, eccentric glass tube 3, glass sock
Pipe 1, crimp head 4, protecting pipe 5.FBG optical fiber 2 is to irradiate optical mask by quasi-molecule coherent light, keeps fiber core a bit of
Refractive index in range occurs uniform periodicity variation along shaft axis of optic fibre and obtains grating, and characteristic is that fiber grating can will be incident
The light of a certain specific wavelength partly or entirely reflects in light.The both ends of FBG optical fiber 2 pass through epoxide-resin glue 9 and 2 bias respectively
Glass tube 3 bonds together, and FBG optical fiber 2 is in natural torsion state.FBG optical fiber 2 is dioxy with eccentric 3 material of glass tube
SiClx, when being influenced by ambient temperature, two kinds of material bonding portion thermal expansion effects synchronize, and grating region is not influenced by external force.2
A bias glass tube 3 is bonded in the both ends of glass bushing 1, and the end face of the outer end face and glass bushing 1 of eccentric glass tube 3 respectively
It flushes, the grating region of FBG optical fiber 2 is placed among glass bushing 1.It is respectively equipped with rubber column 6, rubber at the both ends of glass bushing 1
Glass bushing 1, eccentric glass tube 3 are connected as an entirety by column 6；It is cased with support column 7 outside glass bushing 1；Support column 7 and rubber
Column 6 connects；One end of crimp head 4 is connect by screw thread with support column 7, the suitable screw thread fastening glue of point 1 at screw thread；Crimp head 4
The other end crimped with protecting pipe 5, be equipped with fluid sealant 8 in the junction of crimp head 4 and protecting pipe 5.
In the present embodiment, the grating region part of FBG optical fiber 2 does not carry out secondary coating, avoids and coats at low ambient temperatures
Layer material expands with heat and contract with cold, and the grating region of FBG optical fiber 2 is influenced by external force, it is ensured that measurement accuracy.To improve adhesive strength, light
The both ends in grid region need to remove Nian Jie with eccentric glass tube 3 again after coat.
When ambient temperature changes, temperature is transferred to by support column 7 in glass bushing 1, FBG optical fiber 2 by
So that reflection wavelength is changed to temperature influence, by (FBG) demodulator supervisory wavelength, is calculated according to the linear relationship of wavelength and temperature
Temperature change.
Production method based on the temperature sensor of FBG is：
(1) a FBG optical fiber 2 is chosen, the grating region of the optical fiber did not carried out secondary coating；Grating region marking pen is existed
It makes marks at each 30-35mm in distance grating area both ends；
(2) with special fiber stripping tool along mark fiber stripping 10mm；
(3) 1 both ends of glass bushing will be respectively placed in after the appropriate epoxide-resin glue of 3 appearance millet cake of eccentric glass tube 9, and kept
End face is concordant；
（4）By step（2）FBG optical fiber 2 be placed in step（3）In glass bushing 1 in, ensure that FBG optical fiber 2 is in
1 middle of glass bushing；
（5）Successively in 1 two-end-point epoxide-resin glue 9 of glass bushing, FBG optical fiber 2 is made to be in nature relaxed state；Heating furnace
Temperature be 80 DEG C, baking time be 2 hours；
（6）In the upper rubber column 6 of the both ends of glass bushing 1 set, in 1 housing upper support column 7 of glass bushing, in 7 liang of support column
End is screwed into crimp head 4, and the suitable screw thread fastening glue of point 10 at screw thread；
（7）Fluid sealant 8 is poured into crimp head 3, spontaneous curing penetrates protecting pipe 5 after 12 hours, pressed and locked by hydraulic tongs
Tight protecting pipe 5.
This temperature sensor can be used in the fields such as traffic, bridge structure, coal mine, electric power, petroleum and petrochemical industry.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of the appended claims for the utility model.
Claims (8)
1. a kind of temperature sensor based on FBG, it is characterised in that：Including glass bushing, FBG optical fiber, eccentric glass tube, crimping
Head, protecting pipe, the FBG optical fiber are placed in glass bushing, and both ends are connect with eccentric glass tube respectively, the two of glass bushing
End is respectively equipped with rubber column, and glass bushing, eccentric glass tube are connected as an entirety by rubber column；It is cased with support outside glass bushing
Column, and the support column is connect with rubber column；One end of the crimp head is connect with support column, and the other end is connect with protecting pipe.
2. the temperature sensor according to claim 1 based on FBG, it is characterised in that：The both ends of the FBG optical fiber pass through
Epoxide-resin glue or ultraviolet glue bond together with eccentric glass tube.
3. the temperature sensor according to claim 1 based on FBG, it is characterised in that：The FBG optical fiber is in natural torsion
State.
4. the temperature sensor according to claim 1,2 or 3 based on FBG, it is characterised in that：The light of the FBG optical fiber
Grid region part is without secondary coating.
5. the temperature sensor according to claim 1 based on FBG, it is characterised in that：The support column by screw thread with
Crimp head connects.
6. the temperature sensor according to claim 5 based on FBG, it is characterised in that：There is screw thread fastening glue at screw thread.
7. the temperature sensor according to claim 1 based on FBG, it is characterised in that：The crimp head is adopted with protecting pipe
It is connected with crimping mode.
8. the temperature sensor according to claim 7 based on FBG, it is characterised in that：In the company of crimp head and protecting pipe
It meets place and is equipped with fluid sealant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721907581.2U CN207816481U (en) | 2017-12-30 | 2017-12-30 | temperature sensor based on FBG |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721907581.2U CN207816481U (en) | 2017-12-30 | 2017-12-30 | temperature sensor based on FBG |
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| Publication Number | Publication Date |
|---|---|
| CN207816481U true CN207816481U (en) | 2018-09-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721907581.2U Active CN207816481U (en) | 2017-12-30 | 2017-12-30 | temperature sensor based on FBG |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112525237A (en) * | 2019-09-17 | 2021-03-19 | 武汉理工大学 | EFPI-FBG composite pressure and temperature sensor based on epoxy resin packaging and measuring method |
-
2017
- 2017-12-30 CN CN201721907581.2U patent/CN207816481U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112525237A (en) * | 2019-09-17 | 2021-03-19 | 武汉理工大学 | EFPI-FBG composite pressure and temperature sensor based on epoxy resin packaging and measuring method |
| CN112525237B (en) * | 2019-09-17 | 2023-03-24 | 武汉理工大学 | EFPI-FBG composite pressure and temperature sensor based on epoxy resin packaging and measuring method |
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