CN109239876A - A kind of weak optical fiber Bragg grating temperature sensing optical cable - Google Patents
A kind of weak optical fiber Bragg grating temperature sensing optical cable Download PDFInfo
- Publication number
- CN109239876A CN109239876A CN201811184844.0A CN201811184844A CN109239876A CN 109239876 A CN109239876 A CN 109239876A CN 201811184844 A CN201811184844 A CN 201811184844A CN 109239876 A CN109239876 A CN 109239876A
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- optical fiber
- bragg grating
- fiber bragg
- weak
- temperature sensing
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 66
- 230000003287 optical effect Effects 0.000 title claims abstract description 41
- 229920003023 plastic Polymers 0.000 claims abstract description 23
- 239000004033 plastic Substances 0.000 claims abstract description 23
- 238000009954 braiding Methods 0.000 claims abstract description 8
- 238000003491 array Methods 0.000 claims abstract description 6
- 229920002125 Sokalan® Polymers 0.000 claims abstract description 5
- 150000002148 esters Chemical class 0.000 claims abstract description 5
- 239000004584 polyacrylic acid Substances 0.000 claims abstract description 5
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 239000000835 fiber Substances 0.000 claims description 25
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 229920000058 polyacrylate Polymers 0.000 claims description 4
- 238000005253 cladding Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000004323 axial length Effects 0.000 abstract description 3
- 238000013461 design Methods 0.000 abstract description 3
- 238000009738 saturating Methods 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 229910052681 coesite Inorganic materials 0.000 description 3
- 229910052906 cristobalite Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 229910052682 stishovite Inorganic materials 0.000 description 3
- 229910052905 tridymite Inorganic materials 0.000 description 3
- 239000003292 glue Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/02123—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
A kind of weak optical fiber Bragg grating temperature sensing optical cable, including weak optical fiber Bragg grating array, the guide wire fixed with the weak optical fiber Bragg grating array segment, the weak optical fiber Bragg grating array, guide wire cover in plastic bushing, and plastic bushing is coated with braiding layer.Multiple complete same or wavelength-division multiplex optical fiber optical grating arrays are carved on the weak optical fiber Bragg grating array, the coat of optical fiber optical grating array is modified polyacrylic acid ester layer or saturating ultraviolet coat.The present invention improves the linearity of sensor array by the coat of matched design optical fiber optical grating array, axial length redundancy is generated by the tension of control guide wire simultaneously, the cross influence of stress when eliminating stranding, temperature sensing precision reaches 0.01 DEG C, within the scope of 0 DEG C ~ 80 DEG C, the linearity is good, and cable configuration is simple, convenient for preparation.
Description
Technical field
The present invention relates to a kind of optical fiber and grating sensing temperature optical cable, specifically a kind of weak optical fiber Bragg grating temperature sensing optical cable.
Background technique
Universal with fiber grating string and dim light grid array, fiber-optic grating sensor is applied to distributed temperature measuring occasion
It is more and more.In the temperature monitoring of dam temperature field, water environment, soil moisture content etc., it is desirable that sensor has very high
Precision, and do not generate self-heating.Fiber grating temperature sensor is a kind of passive sensing devices, and heat-conductive characteristic is poor, is had anti-
The remarkable advantages such as electromagnetic interference, high sensitivity, light flexible, many reference amounts composite sensing, large space distributed measurement, in above-mentioned biography
Sense field is with a wide range of applications.But fiber-optic grating sensor is all very sensitive to temperature and strain, under effects of strain,
Its temperature characterisitic can show apparent non-linear.Local microstrain can be all generated when grating stranding or bending, is seriously affected
The absolute precision of sensor.In addition, optical fiber itself is a kind of structure of multilayer, fibre core is the SiO2 being lightly doped, covering SiO2,
The similar thermal expansion coefficient of the two.But in order to improve the mechanical performance of optical fiber, mostly in diameter 125um covering when prepared by traditional fiber
On polyacrylic acid coating ester twice, form diameter 250um optical fiber, due to the polyacrylate thermal expansion coefficient that coats twice with
The SiO2 coefficient of expansion is different, and polyacrylate will appear apparent glass transition when the temperature rises, lead to vitrifying
The thermal expansion coefficient of transformation front and back fluctuates, and influences the linearity of fiber-optic grating sensor temperature-sensitive, and then influence the essence of measurement
Degree.Existing numerous studies often only consider the cross-cutting issue of temperature and strain, the influence of coat are seldom paid close attention to, to a large amount of light
The encapsulation research for the optical fiber optical grating array that grid string is constituted is also few.A kind of Chinese patent " quasi-distributed fiber grating temperature sensing
The encapsulating structure and method of device " (patent No.: ZL:201010185984.7) proposes the encapsulating structure using metallic cover three times,
Not only complex manufacturing technology, and thermal expansion coefficient is inconsistent after multilayer coating structure, easily leads to the non-linear of temperature sensing, it is uncomfortable
Occasion for high-precision temperature sensing.It is limited by traditional raster cabling structure and method, fiber grating temperature sensor one
As measurement accuracy there was only 0.5 DEG C, the linearity in big temperature range is bad, and application range is extremely limited.
Summary of the invention
For the problem that existing fiber grating temperature sensing optical cable temperature accuracy is low, the linearity is bad, the invention proposes one kind
Weak optical fiber Bragg grating temperature sensing optical cable, the invention improve the line of sensor array by the coat of matched design optical fiber optical grating array
Property degree, while axial length redundancy, the cross influence of stress when eliminating stranding, temperature are generated by the tension of control guide wire
Degree sensing accuracy reaches 0.01 DEG C, and within the scope of 0 DEG C~80 DEG C, the linearity is good, and cable configuration is simple, convenient for preparing,
Weak optical fiber Bragg grating temperature sensing arts have important application value.
The technical scheme adopted by the invention is as follows:
A kind of weak optical fiber Bragg grating temperature sensing optical cable, including weak optical fiber Bragg grating array and the weak optical fiber Bragg grating array segment are consolidated
Fixed guide wire, the weak optical fiber Bragg grating array, guide wire cover in plastic bushing, and plastic bushing is coated with braiding layer.Institute
It states and is carved with multiple complete same or wavelength-division multiplex optical fiber optical grating arrays on weak optical fiber Bragg grating array, the coat of optical fiber optical grating array is
Modified polyacrylic acid ester layer or saturating ultraviolet coat.
The guiding linear diameter be greater than 0.5mm~1mm, the guide wire after applying pretension with the weak optical fiber Bragg grating
The interval of array 2 is fixed, and is divided into 30cm between fixed point.
The fixed point uses UV glue sticking, ultraviolet curing, and fixed spot diameter is less than 1mm.
The plastic bushing empty set is in the periphery of the weak optical fiber Bragg grating array and the guide wire, plastic bushing internal diameter
2.0mm~3.0mm, outer diameter 4.0mm~5.0mm, with a thickness of 2mm.
The pretension size that the guide wire applies is related with cable length, and optical cable is longer, and the pretension of application is bigger；It leads
The pretension size that lead applies is related with the internal diameter of plastic bushing, and internal diameter is smaller, and the pretension of application is bigger.
The braiding layer is fibrage, carries out secondary cladding to the plastic bushing outer diameter.
A kind of weak optical fiber Bragg grating temperature sensing optical cable of the present invention, has the advantages that
1), temperature accuracy is high:
Improve the linearity of sensor array by the coat of matched design optical fiber optical grating array, at the same time, leads to
The pretension for crossing control guide wire generates axial length redundancy, the cross influence of stress when eliminating stranding, temperature sensing essence
Degree reaches 0.01 DEG C, and within the scope of 0 DEG C~80 DEG C, the linearity is good.
2), cable configuration is simple, and preparation is easy, and cost performance is high:
Using guide wire as carrier, optical fiber optical grating array is fixed on guide wire, eliminates optical fiber optical grating array in stranding
The influence of Shi Yingli, structure are simple.After optical fiber optical grating array and guide wire are fixed, plastic bushing can be penetrated, or be extruded into
Type, simple process and low cost, cost performance are high.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is weak optical fiber Bragg grating array structure schematic diagram of the invention.
Specific embodiment
As shown in Figure 1 and Figure 2, a kind of weak optical fiber Bragg grating temperature sensing optical cable, including weak optical fiber Bragg grating array 2 and the weak fiber
Grating array 2 is segmented fixed guide wire 5.The weak optical fiber Bragg grating array 2,5 sets of guide wire in plastic bushing 4, plastic sheath
Pipe 4 is coated with braiding layer 1, forms optical fiber and grating sensing temperature optical cable.
Multiple complete same gratings are carved on the weak optical fiber Bragg grating array 2, such as the wavelength of all dim light grid arrays is
1550nm, correlation theory and experiment allow on an array it has been proved that when the reflection of grating drops to 0.01% or so
The grating of 1000 phase co-wavelengths.Certainly, if grating array quantity is greater than 1000 or when spatial resolution is less than 3 meters,
Different wavelength, abbreviation wavelength-division multiplex can be inserted between the grating of phase co-wavelength.Specific combining form can be time-division/wave
Divide multiplexing or wavelength-division/time division multiplexing；The coat 6 of optical fiber optical grating array is modified polyacrylic acid ester layer or ultraviolet painting thoroughly
Coating, thermal expansion coefficient 5.510-7/ DEG C be 20~30um.
5 diameter of guide wire be greater than 0.5mm~1mm, the guide wire 5 after applying pretension with the weak fiber light
The interval of grid array 2 is fixed, and is divided into 30cm between fixed point 3.The fixed point 3 uses UV glue sticking, ultraviolet curing, fixed point
3 diameters are less than 1mm.Since the spacing between every two grating sensing point is differed from tens centimetres to several meters, not every two
There is grating sensing point between a fixed point 3, and the distance between grating sensing point and fixed point 3 should be not less than 5cm.
4 empty set of plastic bushing is in the periphery of the weak optical fiber Bragg grating array 2 and the guide wire 5, plastic bushing 4
Diameter 2.0mm~3.0mm, outer diameter 4.0mm~5.0mm, with a thickness of 2mm.
The pretension size that the guide wire 5 applies is related with cable length, and optical cable is longer, and the pretension of application is bigger.
When cable length is larger, and the optical fiber of band it is suffered in casing frictional force it is bigger, local elongation situation is more serious, this needs
Enough surpluses guarantee that grid region is not influenced by stress.Therefore, by promoting pretension, it is ensured that guide wire is in normal condition
After lower contraction, grating array has enough surpluses.
The pretension size that the guide wire 5 applies is related with the internal diameter of plastic bushing 4, and internal diameter is smaller, and pre- of application
Power is bigger.The internal diameter of plastic bushing 4 is smaller, and the optical fiber of band it is suffered in casing frictional force it is bigger, local elongation situation is got over
Seriously, this needs enough surpluses to guarantee that grid region is not influenced by stress.Therefore, by promoting pretension, it is ensured that guiding
After line is shunk under normal circumstances, grating array has enough surpluses.
The braiding layer 1 is fibrage, carries out secondary cladding to 4 outer diameter of plastic bushing, promotes plastic bushing
Tensile property, it is convenient directly to place.
Its schematic diagram of weak optical fiber Bragg grating array 2 of the present invention as shown in Fig. 2, by fiber core 9, optical fiber optical grating array 8,
Fibre core covering 7, coat 6 are constituted.Fiber core 9 is coated with the covering that material is SIO2 and forms the naked fibre that diameter is 125um；Light
Grid preparation can be in naked fibre by mask plate inscribe online technology be carved with it is several it is complete with or wavelength-division multiplex fiber grating battle arrays
Column 8 can also first coat ultraviolet coat, then inscribe grating array further according to demand, and single grating length is about 10um,
Spacing between two gratings is differed from tens centimetres to several meters.Ultra-thin polyacrylate-coated layer is coated with outside grating array
Or ultraviolet coat, thermal expansion coefficient are 5.5 × 10 thoroughly-7/ DEG C, with a thickness of 20~30um.
A kind of optical fiber and grating sensing temperature optical cable provided by the invention is using nylon yarn as carrier, and by fiber grating, there are redundancies
Segmentation is fixed on guide wire, stress cross influence when eliminating stranding.Fiber grating and guide wire empty set after fixation are being moulded
Strain, which can further be eliminated, in material casing 4 influences, and fiber grating is protected not to be damaged.Entire fiber optic cable production is simple, at low cost
Honest and clean, thermometric is accurate, and is easy to produce on a large scale.
Claims (10)
1. a kind of weak optical fiber Bragg grating temperature sensing optical cable, including weak optical fiber Bragg grating array (2) and the weak optical fiber Bragg grating array (2) point
The fixed guide wire (5) of section, it is characterised in that: the weak optical fiber Bragg grating array (2), guide wire (5) are covered in plastic bushing (4)
Interior, plastic bushing (4) is coated with braiding layer (1)；
Multiple complete same or wavelength-division multiplex optical fiber optical grating arrays, optical fiber optical grating array are carved on the weak optical fiber Bragg grating array (2)
Coat (6) be modified polyacrylic acid ester layer or ultraviolet coat thoroughly.
2. a kind of weak optical fiber Bragg grating temperature sensing optical cable according to claim 1, it is characterised in that: guide wire (5) diameter is big
In 0.5mm~1mm.
3. a kind of weak optical fiber Bragg grating temperature sensing optical cable according to claim 1, it is characterised in that: the guide wire (5) is applying
It is spaced and fixes with the weak optical fiber Bragg grating array (2) after pretension, fixed point is divided into 30cm between (3).
4. a kind of weak optical fiber Bragg grating temperature sensing optical cable according to claim 3, it is characterised in that: the fixed point (3) uses UV
Glue sticking, ultraviolet curing.
5. according to a kind of weak optical fiber Bragg grating temperature sensing optical cable of claim 3 or 4, it is characterised in that: fixed point (3) diameter is less than
1mm。
6. a kind of weak optical fiber Bragg grating temperature sensing optical cable according to claim 1, it is characterised in that: plastic bushing (4) empty set
In the periphery of the weak optical fiber Bragg grating array (2) and the guide wire (5).
7. a kind of weak optical fiber Bragg grating temperature sensing optical cable according to claim 6, it is characterised in that: plastic bushing (4) internal diameter
2.0mm~3.0mm, outer diameter 4.0mm~5.0mm, with a thickness of 2mm.
8. a kind of weak optical fiber Bragg grating temperature sensing optical cable according to claim 1, it is characterised in that: what the guide wire (5) applied
Pretension size is related with cable length, and optical cable is longer, and the pretension of application is bigger；
The pretension size that guide wire (5) applies is related with the internal diameter of plastic bushing (4), and internal diameter is smaller, and the pretension of application is got over
Greatly.
9. a kind of weak optical fiber Bragg grating temperature sensing optical cable according to claim 1, it is characterised in that: the braiding layer (1) is fiber
Braiding carries out secondary cladding to the plastic bushing (4) outer diameter.
10. a kind of weak optical fiber Bragg grating array preparation method, it is characterised in that: by fiber core (9), optical fiber optical grating array (8), fibre
Core covering (7), coat (6) are constituted；It is SIO that fiber core (9), which is coated with material,2Covering formed naked fibre；It is prepared by grating
In naked fibre technology is inscribed by mask plate online and is carved with several complete same or wavelength-division multiplex optical fiber optical grating arrays (8)；Or first
Ultraviolet coat thoroughly is coated, then inscribes grating array further according to demand, single grating length is about 10um, between two gratings
Spacing differed from tens centimetres to several meters；Ultra-thin polyacrylate-coated layer or ultraviolet coating thoroughly are coated with outside grating array
Layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811184844.0A CN109239876A (en) | 2018-10-11 | 2018-10-11 | A kind of weak optical fiber Bragg grating temperature sensing optical cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811184844.0A CN109239876A (en) | 2018-10-11 | 2018-10-11 | A kind of weak optical fiber Bragg grating temperature sensing optical cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109239876A true CN109239876A (en) | 2019-01-18 |
Family
ID=65053165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811184844.0A Pending CN109239876A (en) | 2018-10-11 | 2018-10-11 | A kind of weak optical fiber Bragg grating temperature sensing optical cable |
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| Country | Link |
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| CN (1) | CN109239876A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110596837A (en) * | 2019-10-09 | 2019-12-20 | 宜昌睿传光电技术有限公司 | Temperature-sensing optical fiber cable free of stress packaging and preparation method thereof |
| CN114088241A (en) * | 2021-10-21 | 2022-02-25 | 武汉理工大学 | Weak fiber grating array temperature/vibration composite sensing optical cable and use method thereof |
| CN114509152A (en) * | 2022-02-18 | 2022-05-17 | 武汉理工大学 | Hydrophone based on ribbon grating array, manufacturing method and sound pressure detection method |
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| CN107144373A (en) * | 2017-06-16 | 2017-09-08 | 武汉理工大学 | One kind exempts from stress grating array temperature sensing optical cable and its method for sensing |
| CN208902928U (en) * | 2018-10-11 | 2019-05-24 | 宜昌睿传光电技术有限公司 | A kind of weak optical fiber Bragg grating temperature sensing optical cable |
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2018
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| CN200952964Y (en) * | 2006-06-23 | 2007-09-26 | 周智 | Non-external influence optical fiber grating temperature sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110596837A (en) * | 2019-10-09 | 2019-12-20 | 宜昌睿传光电技术有限公司 | Temperature-sensing optical fiber cable free of stress packaging and preparation method thereof |
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| CN114088241A (en) * | 2021-10-21 | 2022-02-25 | 武汉理工大学 | Weak fiber grating array temperature/vibration composite sensing optical cable and use method thereof |
| CN114509152A (en) * | 2022-02-18 | 2022-05-17 | 武汉理工大学 | Hydrophone based on ribbon grating array, manufacturing method and sound pressure detection method |
| CN114509152B (en) * | 2022-02-18 | 2022-11-29 | 武汉理工大学 | Hydrophone based on ribbon grating array, manufacturing method and sound pressure detection method |
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