CN107643130A - A kind of temperature sensitized optical fiber grating sensor - Google Patents
A kind of temperature sensitized optical fiber grating sensor Download PDFInfo
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- CN107643130A CN107643130A CN201710849214.XA CN201710849214A CN107643130A CN 107643130 A CN107643130 A CN 107643130A CN 201710849214 A CN201710849214 A CN 201710849214A CN 107643130 A CN107643130 A CN 107643130A
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- optical fiber
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- metal cap
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 56
- 239000002184 metal Substances 0.000 claims abstract description 84
- 229910052751 metal Inorganic materials 0.000 claims abstract description 84
- 239000000835 fiber Substances 0.000 claims abstract description 38
- 230000005540 biological transmission Effects 0.000 claims abstract description 6
- 238000001228 spectrum Methods 0.000 claims abstract description 4
- 239000003292 glue Substances 0.000 claims description 15
- 239000003822 epoxy resin Substances 0.000 claims description 7
- 229920000647 polyepoxide Polymers 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 3
- 239000010931 gold Substances 0.000 claims description 3
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims 2
- 230000035945 sensitivity Effects 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 5
- 238000005538 encapsulation Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 230000001502 supplementing effect Effects 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 3
- 230000001235 sensitizing effect Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 206010070834 Sensitisation Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000747 cardiac effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000985 reflectance spectrum Methods 0.000 description 1
- 238000004153 renaturation Methods 0.000 description 1
- 230000008313 sensitization Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- Measuring Temperature Or Quantity Of Heat (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention belongs to Fiber Grating Sensors Technology field, and in particular to a kind of temperature sensitized optical fiber grating sensor.A kind of temperature sensitized optical fiber grating sensor, described encapsulating structure include hollow metal tube and metal cap, and described metal cap has two both ends for being respectively arranged at hollow metal tube；Described grating transmission structure includes fiber grating, fiber coupler and optical fiber one and optical fiber two, fiber grating is arranged on optical fiber one, optical fiber one is located in hollow metal tube, and optical fiber one is connected by optical fiber two with coupler, the input of photoelectrical coupler Single port, output demodulation spectrum.The present invention utilizes rotational structure both ends metal cap, metal cap is angularly rotated to same direction, applies prestressing force to grating；The thermal expansivity that dispensing heating process metal structure thermal expansivity during because of encapsulation is more than grating is avoided, causes the precision reduction of thermometric after cooling.The thermometric of grating is influenceed when supplementing dispensing by adjusting both ends metal cap, realizes the effect of enhanced sensitivity of structure.
Description
Technical field
The invention belongs to Fiber Grating Sensors Technology field, and in particular to a kind of temperature sensitized optical fiber grating sensor.
Background technology
Along with the development of Fibre Optical Communication Technology, various passive devices continuously emerge, and fiber grating turns into fiber optic communication
Primary element in system.Foreign countries have optical fiber grating temperature enhanced sensitivity first in nineteen ninety-five in terms of report, 1997 at home
Xian Inst. of Optics and Precision Mechanics, Chinese Academy of Sciences it is also proposed the imagination of grating temperature enhanced sensitivity.Fibre optic temperature sensor is existing
For there is important application value in industrial production, but the sensitivity of fiber grating pair temperature is relatively low, wavelength 1550nm naked fibre gratings
Temperature sensitivity be about 0.0082~0.012nm/oC, Thermo-sensitive and optic fiber grating wavelength also have relation, and wavelength is shorter, temperature sensitive
Property is poorer.Therefore need to try the Thermo-sensitive for improving fiber grating, to improve the sensitivity of TEMP, meet to be actually needed.
Known fiber grating enhanced sensitivity sensing（Such as：CN101413831A、CN101294855A）, its design method is related to
To the combination of various structures, fiber grating is by the way that after associated with more structures, the overall uniformity of structure reduces；The weight of operation
Renaturation is low, and because sensor centering cardiac wave length requires, disposable encapsulation can not be accurately obtained the structure of required wavelength.It is known
Optical wavelengthmeter（Such as：CN2646684Y, CN103309002A）, its design structure is cumbersome, and the position of regulation is more, and to knot
The levelness of structure requires, if angle is improper will to enclose unnecessary stress, influences the result of encapsulation.
The content of the invention
It is an object of the invention to provide a kind of optical fiber grating temperature enhanced sensitivity for problems of the prior art to sense
Device, the sensor construction is simple, smart small, high sensitivity, to the thermometric shadow of grating when supplementing dispensing by adjusting both ends metal cap
Ring, so as to realize the effect of enhanced sensitivity of encapsulating structure.
The technical scheme is that：
A kind of temperature sensitized optical fiber grating sensor, including encapsulating structure and grating transmission structure, described encapsulating structure include
Hollow metal tube and metal cap, described metal cap have two both ends for being respectively arranged at hollow metal tube；Described grating passes
Defeated structure includes fiber grating, fiber coupler and optical fiber one and optical fiber two, and fiber grating is arranged on optical fiber one, optical fiber one
In in hollow metal tube, optical fiber one is connected by optical fiber two with coupler, the input of photoelectrical coupler Single port, output solution light modulation
Spectrum；
Described hollow metal tube both ends inwall is provided with screw thread, and both ends screw thread is opposite threads, outside hollow metal tube both ends
Side sets symmetrical zero point tag line；
Described metal cap is axially penetrating, is made up of the end of thread and non-threaded end；The end of thread is connected with metal tube, end of thread outer wall
On be provided with the equal pitch thread to be matched with the screw thread in metal tube；Fixed optical fiber is provided with the non-threaded end of metal cap
Fixing groove one and fixing groove two, fixing groove one and fixing groove dimorphism stepped, the non-threaded end of metal cap and the company of the end of thread
Graduation mark is carved with the outside of the place of connecing, and marks the arrow of rotating metallic cap.
Specifically, described hollow metal pipe range 30mm, threaded part internal diameter 5mm, external diameter 6.5mm, screw thread overall length
Spend 5mm.
Specifically, described metal cap overall length 10mm, end of thread overall length 5mm；The end of thread external diameter 4.9mm, internal diameter 2mm；It is non-
The end of thread overall length 5mm, internal diameter 3.5mm, external diameter 6.5mm.
Specifically, the end of described optical fiber one is fixed on the gold at hollow metal tube both ends by bicomponent epoxy resin glue
Belong on cap, and sealed using 9222 metal screws locking glue.
Specifically, described metal screws locking glue be thixotropy viscosity, screw-threaded coupling sealing during M≤6mm.
Specifically, the diameter of described fixing groove one is more than the diameter of fixing groove two, fixing groove two is located at fixing groove one
Inner side.
Specifically, the non-threaded end of metal cap 0.2nm corresponding with the every scale of the tick marks of the junction of the end of thread.
The beneficial effects of the invention are as follows：It is to utilize rotational structure both ends metal cap, metal cap is angularly revolved to same direction
Turn, apply prestressing force to grating；Dispensing heating process metal structure thermal expansivity is more than the hot swollen of grating when avoiding because of encapsulation
Swollen property, cause the precision reduction of thermometric after cooling.The thermometric of grating is influenceed when supplementing dispensing by adjusting both ends metal cap,
Realize the effect of enhanced sensitivity of structure.
The present invention is opposite threads by designing metal tube both ends, the metal cap at easy adjustment structure both ends, to grating
Apply prestressing force, and wavelength value needed for can easily determining；Metal cap is fixed by using metal screws locking glue, by ripple
The function of determining centre wavelength is realized in long locking, simple in construction, and essence is small compact.The present invention realizes optical fiber grating temperature enhanced sensitivity
Encapsulating structure, and can accurately position initial center wavelength；Accurately positioning initial wavelength, it is the series connection solution of fiber grating
Tune provides a great convenience.Solve poor fiber grating anti-shake performance, measurement influence factor complexity, wavelength from structure not
The problem of stable.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the reflectance spectrum display figure of a fiber grating after regulation.
1 bicomponent epoxy resin glue, 2 fiber gratings, 3 hollow metal tubes, 4 optical fiber one, 5 equal pitch threads,
6 metal caps, 7 optical fiber two, 8 photoelectrical couplers, 9 fixing grooves two, 10 fixing grooves one.
Embodiment
It is a kind of structural representation of temperature sensitized optical fiber grating sensor as shown in Figure 1, including encapsulating structure and grating
Transmission structure, described encapsulating structure include hollow metal tube 3 and metal cap 6, and described metal cap 6 has two to be respectively arranged at
The both ends of hollow metal tube 3；Described grating transmission structure includes fiber grating 2, fiber coupler 8 and optical fiber 1 and optical fiber
27, fiber grating 2 is arranged on optical fiber 1, and optical fiber 1 is located in hollow metal tube 3, and optical fiber 1 passes through optical fiber 27 and light
Electric coupler 8 connects, the input of the Single port of photoelectrical coupler 8, output demodulation spectrum.The end of described optical fiber 1 passes through double groups
Part epoxide-resin glue 1 is fixed on the metal cap 6 at the both ends of metal tube 3, and is sealed using 9222 metal screws locking glue.It is described
Metal screws locking glue be thixotropy viscosity, screw-threaded coupling sealing during M≤6mm.
The described both ends inwall of hollow metal tube 3 is provided with screw thread, and both ends screw thread is opposite threads, hollow metal tube 3
Symmetrical zero point tag line is set on the outside of both ends.Described 3 long 30mm of hollow metal tube, threaded part internal diameter 5mm, external diameter
6.5mm, full flight length 5mm.
Described metal cap 6 is axially penetrating, is made up of the end of thread and non-threaded end；The end of thread is connected with metal tube 3, screw thread
The equal pitch thread 5 to be matched with the screw thread in metal tube 3 is provided with the outer wall of end；It is provided with the non-threaded end of metal cap 6
The fixing groove 1 and fixing groove 29 of fixed optical fiber, fixing groove 1 and fixing groove 29 form step-like, described fixing groove
One 10 diameter is more than the diameter of fixing groove 29, and fixing groove 29 is located at the inner side of fixing groove 1.The non-threaded end of metal cap 6
With being carved with graduation mark on the outside of the junction of the end of thread, and mark the arrow of rotating metallic cap 6.The described overall length 10mm of metal cap 6,
End of thread overall length 5mm；The end of thread external diameter 4.9mm, internal diameter 2mm；Non-threaded end overall length 5mm, internal diameter 3.5mm, external diameter 6.5mm.Gold
Belong to the non-threaded end 0.2nm corresponding with the every scale of the tick marks of the junction of the end of thread of cap 6.
When encapsulating temperature sensitized optical fiber grating sensor of the present invention, two metal caps 6 are uniformly smeared 9222 respectively
Metal screws lock glue, then two metal caps 6 be separately mounted to the both ends of hollow metal tube 3 and be tightened to turn again；Will
Wire stripping length 28mm, grating length 10mm grating penetrate optical fiber 1 and are put into hollow metal tube 3 and the metal cap 6 at both ends, make
Fiber grating is in an intermediate position, and on the premise of being stretched at the both ends of optical fiber 1, by a diameter of 2.0mm's at the both ends of metal cap 6
After full bicomponent epoxy resin glue 1 is filled in hole, the heating solidification of epoxide-resin glue 1 is integrally formed optical fibre raster package structure；
By the design to sensitizing sensor structure, stablized, reliable grating wavelength.
The principle of the present invention is as follows：
When to same direction rotational structure both ends metal cap 6, according to the torsion characteristic of fiber grating 2, each single-ended metal
Cap rotation is no more than 3 scale values, it is ensured that the constitutionally stable wavelength output of temperature sensitizing.Pass through the rotation of two metal caps 6
Turn grating stress, power, which acts on the two-end-point of fiber grating 2, the position of bi-component epoxide-resin glue 1, is in fiber grating 2 and draws
Straight state, and required centre wavelength is pulled to, it is easy to series connection to test.
When under steady temperature, grating is caused refractive index n by the effect elasto-optical effect of stresseffChange, deformation make grating all
Phase Λ changes, and produces center wavelength shift.Fiber bragg grating center wavelength variation delta λBFor：
（1）
Wherein, lFor the length of grating；
It is changed into when producing shapeWhen pass through to formula（1）Deformation can obtain：
（2）
Wherein：It is fiber grating strain sensitivity coefficient；It is the axial strain of fiber grating；It is optical fiber light
The centre wavelength of grid.
By formula it can be seen that optical fiber grating temperature sensitization structure in principle should by the generation of substrate thermal expansion
Power acts on fiber grating 2 the temperature sensitizing result for realizing fiber grating 2, while the exposed encapsulation of fiber grating 2 is made defeated
Go out Wavelength stabilized, it is achieved thereby that optical fiber grating temperature enhanced sensitivity, determine the stable output of initial wavelength.
Finally it should be noted that:The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof；To the greatest extent
The present invention is described in detail with reference to preferred embodiments for pipe, those of ordinary skills in the art should understand that：Still
The embodiment of the present invention can be modified or equivalent substitution is carried out to some technical characteristics；Without departing from this hair
The spirit of bright technical scheme, it all should cover among the claimed technical scheme scope of the present invention.
Claims (7)
1. a kind of temperature sensitized optical fiber grating sensor, including encapsulating structure and grating transmission structure, it is characterised in that described
Encapsulating structure includes hollow metal tube（3）And metal cap（6）, described metal cap（6）There are two to be respectively arranged at hollow metal
Pipe（3）Both ends；Described grating transmission structure includes fiber grating（2）, fiber coupler（8）With optical fiber one（4）And optical fiber
Two（7）, fiber grating（2）It is arranged at optical fiber one（4）On, optical fiber one（4）Positioned at hollow metal tube（3）It is interior, optical fiber one（4）Pass through
Optical fiber two（7）With photoelectrical coupler（8）Connection, photoelectrical coupler（8）Single port input, output demodulation spectrum；Described is hollow
Metal tube（3）Both ends inwall is provided with screw thread, and both ends screw thread is opposite threads, hollow metal tube（3）Setting pair on the outside of both ends
The zero point tag line of title；Described metal cap（6）It is axially penetrating, it is made up of the end of thread and non-threaded end；The end of thread and metal tube
（3）Connection, is provided with end of thread outer wall and metal tube（3）The equal pitch thread that interior screw thread matches（5）；Metal cap（6）
Non-threaded end in be provided with the fixing groove one of fixed optical fiber（10）With fixing groove two（9）, fixing groove one（10）With fixing groove two
（9）Form step-like, metal cap（6）Non-threaded end and the end of thread junction on the outside of be carved with graduation mark, and mark rotation gold
Belong to cap（6）Arrow.
A kind of 2. temperature sensitized optical fiber grating sensor according to claim 1, it is characterised in that described hollow metal tube
（3）Long 30mm, threaded part internal diameter 5mm, external diameter 6.5mm, full flight length 5mm.
A kind of 3. temperature sensitized optical fiber grating sensor according to claim 1, it is characterised in that described metal cap（6）
Overall length 10mm, end of thread overall length 5mm；The end of thread external diameter 4.9mm, internal diameter 2mm；Non-threaded end overall length 5mm, internal diameter 3.5mm, external diameter
6.5mm。
A kind of 4. temperature sensitized optical fiber grating sensor according to claim 1, it is characterised in that described optical fiber one（4）
End pass through bicomponent epoxy resin glue（1）It is fixed on metal tube（3）The metal cap at both ends（6）On, and use 9222 gold
Belong to the sealing of screwed lock solid glue.
A kind of 5. temperature sensitized optical fiber grating sensor according to claim 1, it is characterised in that described metal screws lock
Solid glue is thixotropy viscosity, and screw-threaded coupling seals during M≤6mm.
A kind of 6. temperature sensitized optical fiber grating sensor according to claim 1, it is characterised in that described fixing groove one
（10）Diameter be more than fixing groove two（9）Diameter, fixing groove two（9）Positioned at fixing groove one（10）Inner side.
A kind of 7. temperature sensitized optical fiber grating sensor according to claim 1, it is characterised in that metal cap（6）Non- spiral shell
Line end 0.2nm corresponding with the every scale of the tick marks of the junction of the end of thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710849214.XA CN107643130A (en) | 2017-09-20 | 2017-09-20 | A kind of temperature sensitized optical fiber grating sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710849214.XA CN107643130A (en) | 2017-09-20 | 2017-09-20 | A kind of temperature sensitized optical fiber grating sensor |
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| Publication Number | Publication Date |
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| CN107643130A true CN107643130A (en) | 2018-01-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110207848A (en) * | 2019-07-01 | 2019-09-06 | 蚌埠学院 | A kind of substrate adds upper cover type temperature sensitized optical fiber grating sensor |
| CN114136349A (en) * | 2021-11-16 | 2022-03-04 | 西安交通大学 | High-temperature-resistant Bragg fiber grating sensor with variable sensing quantity and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110207848A (en) * | 2019-07-01 | 2019-09-06 | 蚌埠学院 | A kind of substrate adds upper cover type temperature sensitized optical fiber grating sensor |
| CN114136349A (en) * | 2021-11-16 | 2022-03-04 | 西安交通大学 | High-temperature-resistant Bragg fiber grating sensor with variable sensing quantity and preparation method thereof |
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Application publication date: 20180130 |