CN105698696B - Distribution type fiber-optic enhanced sensitivity device - Google Patents
Distribution type fiber-optic enhanced sensitivity device Download PDFInfo
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- CN105698696B CN105698696B CN201610213280.3A CN201610213280A CN105698696B CN 105698696 B CN105698696 B CN 105698696B CN 201610213280 A CN201610213280 A CN 201610213280A CN 105698696 B CN105698696 B CN 105698696B
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- optic
- distribution type
- type fiber
- opening
- pipe collar
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/165—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by means of a grating deformed by the object
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- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
Distribution type fiber-optic enhanced sensitivity device is related to the strain sensitization technology of distributed optical fiber, in order to solve the problems, such as that existing distribution type fiber-optic is difficult to monitor small strain.The pipe collar of the present invention is in annular shape, the optical-fibre channel for placing distribution type fiber-optic is provided with inside pipe collar, it is opened on pipe collar there are three isometric No.1 opening, each No.1 opening is additionally provided at least one rubber connection sheet, and the rubber connection sheet is used to connect the both ends of No.1 opening；No. two openings are additionally provided on pipe collar, the outside being open at No. two is arranged in fixed structure, the both ends for fixing No. two openings；A package parts are respectively fixed at the both ends of each No.1 opening and No. two openings, and the package parts are used for stationary distribution formula optical fiber.The present invention can carry out the small strain other than fiber-optic monitoring range hundreds times to thousands of times amplification, increase the sensitivity of optical fiber impression strain, suitable for municipal administration, the on-line monitoring field of oil or natural gas line.
Description
Technical field
The present invention relates to the strain sensitization technologies of distributed optical fiber.
Background technology
Currently, have relatively broad application in the health monitoring that distribution type fiber-optic in bridge, is built etc., however, for
The larger materials of elasticity modulus such as municipal cast-iron pipe, the interior hoop strain caused by variation in water pressure of pipeline are usually small
In the monitoring sensitivity of distribution type fiber-optic, thus distribution type fiber-optic is difficult to existing effective strain monitoring in fact, this is limited significantly
Distribution type fiber-optic monitors the popularization in field on-line in municipal administration, oil or natural gas line.
Invention content
The problem of being difficult to monitor small strain the purpose of the present invention is to solve existing distribution type fiber-optic, provides one kind
Distribution type fiber-optic enhanced sensitivity device.
Distribution type fiber-optic enhanced sensitivity device of the present invention includes 2, eight pipe collar 1 made of metal, distribution type fiber-optic gold
Package parts 3, fixed structure 4 and multiple rubber connection sheets 5 made of belonging to；
The pipe collar 1 is in annular shape, and for being fixed on pipeline external, 1 circumferential direction inside direction of pipe collar is provided with circular light
Fine channel, the optical-fibre channel open that there are three isometric No.1s to be open for placing distribution type fiber-optic 2 on pipe collar 1, three one
Pipe collar 1 is divided into three sections by number opening, and each No.1 opening is additionally provided at least one rubber connection sheet 5, the rubber connection
Piece 5 is used to connect the both ends of No.1 opening；
No. two openings are additionally provided on pipe collar 1, the outside being open at described No. two is arranged in fixed structure 4, for fixing two
Number opening both ends；
A package parts 3 are respectively fixed at the both ends of each No.1 opening and No. two openings, and the package parts 3 are used for
Stationary distribution formula optical fiber.
Distribution type fiber-optic enhanced sensitivity device of the present invention can be to the small strain other than fiber-optic monitoring range into line number
Hundred times to thousands of times of amplification, to increase the sensitivity of optical fiber impression strain, such as the armored concrete water delivery for DN2200
Pipe, pipe surface microstrain can be amplified 4600 times or so, can reach the minimum monitoring sensitivity requirement of distribution type fiber-optic, from
Online health monitoring of the distribution type fiber-optic in pipelines such as municipal administration, natural gas line, oil may be implemented, to pipe safety and control
Tubing giving sufficient strength is most important.When the enhanced sensitivity device is installed, only several tested points need to be selected to be pacified on pipeline section according to result of calculation
Dress excavates the various expenses generated so as to avoid large area, and the device is quick and easy for installation, it is only necessary to by respective tube hoop clip
Mounted in pipe under test outer surface, not only it is suitble to the interim health monitoring of pipeline, but also be suitble to long term monitoring.
Description of the drawings
Fig. 1 is the sectional view of the distribution type fiber-optic enhanced sensitivity device described in embodiment one, wherein 7 indicate inner wall of the pipe；
Fig. 2 is the scheme of installation of the distribution type fiber-optic enhanced sensitivity device described in embodiment one；
Fig. 3 is the structural schematic diagram of the No.1 opening in embodiment one and five；
Fig. 4 is the structural schematic diagram of the fixed structure in embodiment three, and wherein plus sige and minus sign indicate distributed respectively
Optical fiber extends and extends back forward；
Fig. 5 is the structural schematic diagram of the fixed structure in embodiment four.
Specific implementation mode
Specific implementation mode one：Illustrate present embodiment in conjunction with Fig. 1 to Fig. 3, the distribution type fiber-optic described in present embodiment
Enhanced sensitivity device includes pipe collar 1 made of metal, package parts 3, fixed structure 4 made of 2, eight metals of distribution type fiber-optic and more
A rubber connection sheet 5；
The pipe collar 1 is in annular shape, and for being fixed on pipeline external, 1 circumferential direction inside direction of pipe collar is provided with circular light
Fine channel, the optical-fibre channel open that there are three isometric No.1s to be open for placing distribution type fiber-optic 2 on pipe collar 1, three one
Pipe collar 1 is divided into three sections by number opening, and each No.1 opening is additionally provided at least one rubber connection sheet 5, the rubber connection
Piece 5 is used to connect the both ends of No.1 opening；
No. two openings are additionally provided on pipe collar 1, the outside being open at described No. two is arranged in fixed structure 4, for fixing two
Number opening both ends；
A package parts 3 are respectively fixed at the both ends of each No.1 opening and No. two openings, and the package parts 3 are used for
Stationary distribution formula optical fiber.
Distribution type fiber-optic 2 is wrapped in the optical-fibre channel inside steel pipe collar 1, as shown in Figure 1, pipe collar 1 is cut into three
Part, the distance between arbitrary two parts are equal, that is, form the No.1 opening of three equal lengths.Make the distribution in optical-fibre channel
Formula optical fiber 2 keeps fully loosening, and reserves certain length in No.1 opening and No. two openings.Package parts 3 are using conventional
Metal derby.Distribution type fiber-optic enhanced sensitivity device is fastened on pipeline external by fixed structure 4, then being located at three No.1s
The distribution type fiber-optic 2 of opening is in then tight state.To prevent the distribution type fiber-optic 2 of opening from transporting and quilt in installation process
It breaks, the rubber connection sheet 5 that each No.1 opening is both provided with two cross-sectional dimension 5mm is connected to the both ends that No.1 is open.
Pipe collar 1 is installed on pipeline outer wall, the width of opening is adjusted by adjustment fixing structure 4, makes three No.1 openings
Distribution type fiber-optic 2 has initial miniature deformation.When pipeline is expanded or shunk due to internal pressure variation, due to metal
Elasticity modulus is much larger than the elasticity modulus of rubber and distribution type fiber-optic 2, then the deformation of entire pipeline can be approximately considered whole etc.
Amount is embodied on three sections of optical fiber, to realize the effect amplified to pipe surface small strain.
Specific implementation mode two：Present embodiment is to the distribution type fiber-optic enhanced sensitivity device described in embodiment one into one
Step limits, and in present embodiment, pipe collar 1 is divided into three sections of equal length by three No.1 openings.
Three No.1 openings are located on three trisection points of 1 circumferencial direction of pipe collar, and distribution type fiber-optic 2 is made to be divided
At the three parts of equal length, in order to convenience of calculation.
If the length of every section of distribution type fiber-optic 2 is L1, sectional area A1, elastic modulus E1, suffered pulling force N1；
The length of package parts 3 is L2, sectional area A2, elastic modulus E2, suffered pulling force N2；
Rubber connects leaf length L3, sectional area A3, elastic modulus E3, suffered pulling force N3；
It is research object with package parts 3, rubber connection sheet 5 and distribution type fiber-optic 2, from the equilibrium condition of power：
N2=N1+N3 (1)
From mechanics of materials correlation formula：
I.e.：
Again because of E1>>E3, L1≈L3, △ L1≈△L3 (5)
Therefore N2≈N1 (6)
To avoid confusion, N is indicated with N below1And N2
Every section of optical-fiber deformation amount：
The deformation quantity of each package parts 3：
The distribution type fiber-optic 2 known to formula (1) (2), which strains, is：
The strain of package parts 3 is：
Then：
Because of E2>>E1,And A2>>A1,Therefore the strain of package parts 3 can be ignored,The deformation of the pipeline of a diameter of D can be approximate
Think all to be embodied on three sections of distribution type fiber-optics 2：
3△L1≈△L0=D π ε0 (12)
Theoretical enhanced sensitivity multiple is
For the aqueduct of DN2200, L is taken1=0.5cm, then pipeline strain can amplify 4605 times.
Specific implementation mode three：Embodiment is described with reference to Fig. 4, and present embodiment is to point described in embodiment one
Cloth photosensitivity enhancing device further limits, in present embodiment, the fixed structure 4 include No.1 protrusion 4-1, No. two it is convex
4-2, head cover 4-3 and sheet metal are played, No.1 protrusion 4-1 and No. two protrusion 4-2 are separately fixed at the both ends of No. two openings, steel disc position
Between No.1 protrusion 4-1 and No. two protrusion 4-2, head cover 4-3 is fixed by screws in No.1 protrusion 4-1 and No. two protrusion 4-2
Top.
In present embodiment, sheet metal can choose different-thickness according to actual conditions, and sheet metal is inserted in No.1 protrusion
Between 4-1 and No. two protrusion 4-2, the distribution type fiber-optic 2 of three No.1 openings is made to generate initial microstrain, it then will with screw
Head cover 4-3 is fixed on No.1 protrusion 4-1 and No. two protrusion 4-2, thus plays the role of stationary distribution formula photosensitivity enhancing device.
Specific implementation mode four：Present embodiment that embodiment is described with reference to Fig.5, is to point described in embodiment one
Cloth photosensitivity enhancing device further limits, and in present embodiment, the fixed structure 4 includes No.1 protrusion 4-1 and No. two
Raised 4-2, the No.1 protrusion 4-1 and No. two protrusion 4-2 are separately fixed at the both ends of No. two openings, the top of No.1 protrusion 4-1
Fluted 4-4 is arranged in portion, and sliding block 4-5, the sliding block 4-5 are provided at the top of No. two protrusion 4-2 can be along No. two tops protrusion 4-2
Portion moves, and can enter inside groove 4-4, and the top surfaces groove 4-4 and the top surface of sliding block 4-5 are both provided with sawtooth.
Present embodiments provide for another concrete structures of fixed structure 4, as shown in figure 5, by sliding block 4-5 to moving to left
It is dynamic, stop movement after making it into groove 4-4 certain lengths, at this moment the distribution type fiber-optic 2 of three No.1 openings will produce just
Beginning microstrain, two rows of sawtooth can play fixed function to the position of sliding block 4-5.Fixed structure 4 in present embodiment is adjusted
The precision of initial microstrain is better than embodiment two, and the screw due to eliminating top, so operationally more square
Just quick.
Specific implementation mode five：Embodiment is described with reference to Fig. 3, and present embodiment is to described in embodiment one to four
Distribution type fiber-optic enhanced sensitivity device further limit, in present embodiment, each opening is additionally provided with screening glass 6, and institute
Screening glass 6 is stated to be located at outside rubber connection sheet 5.
And optical fiber is further reinforced using the screening glass 6 of steel in No.1 opening, the both ends of No.1 opening can be arranged
Screening glass 6 is inserted into slot by slot, covers rubber connection sheet 5 and optical fiber, and screening glass 6 can reduce buried rear surrounding soil
Influence of the earth to optical fiber.
Claims (5)
1. distribution type fiber-optic enhanced sensitivity device, which is characterized in that the device includes pipe collar made of metal (1), distribution type fiber-optic
(2), package parts (3), fixed structure (4) and multiple rubber connection sheets (5) made of eight metals；
The pipe collar (1) is in annular shape, and for being fixed on pipeline external, pipe collar (1) circumferential direction inside direction is provided with circular light
Fine channel, the optical-fibre channel open that there are three isometric No.1s to be open for placing distribution type fiber-optic (2) on pipe collar (1), and three
Pipe collar (1) is divided into three sections by a No.1 opening, and each No.1 opening is additionally provided at least one rubber connection sheet (5), described
Rubber connection sheet (5) is used to connect the both ends of No.1 opening；
No. two openings are additionally provided on pipe collar (1), the outside being open at described No. two is arranged in fixed structure (4), for fixing two
Number opening both ends；
A package parts (3) is respectively fixed at the both ends of each No.1 opening and No. two openings, and the package parts (3) are used for
Stationary distribution formula optical fiber；
The width of opening is adjusted by adjustment fixing structure (4), the distribution type fiber-optic (2) of three No.1 openings is made to have just
Beginning miniature deformation；
When pipeline is expanded or shunk due to internal pressure variation, since the elasticity modulus of metal is much larger than rubber and distribution
The elasticity modulus of formula optical fiber (2), then the deformation of entire pipeline is approximately considered whole equivalent and is embodied on three sections of optical fiber, to realize
To the effect of pipe surface small strain amplification.
2. distribution type fiber-optic enhanced sensitivity device according to claim 1, which is characterized in that three No.1s are open pipe collar (1)
It is divided into three sections of equal length.
3. distribution type fiber-optic enhanced sensitivity device according to claim 1, which is characterized in that the fixed structure (4) includes one
Number protrusion (4-1), No. two protrusions (4-2), head cover (4-3) and sheet metal, No.1 protrusion (4-1) and No. two protrusions (4-2) are distinguished
The both ends of No. two openings are fixed on, steel disc is located between No.1 raised (4-1) and No. two protrusions (4-2), and head cover (4-3) passes through spiral shell
Nail is fixed on No.1 raised (4-1) and No. two protrusion (4-2) tops.
4. distribution type fiber-optic enhanced sensitivity device according to claim 1, which is characterized in that the fixed structure (4) includes one
Number protrusion (4-1) and No. two protrusions (4-2), the No.1 raised (4-1) and No. two protrusions (4-2) are separately fixed at No. two openings
Both ends, the top of No.1 protrusion (4-1) is arranged fluted (4-4), is provided with sliding block (4-5) at the top of No. two protrusions (4-2),
The sliding block (4-5) can be mobile at the top of No. two protrusions (4-2), and can enter groove (4-4) inside, groove (4-4)
Top surface and the top surface of sliding block (4-5) are both provided with sawtooth.
5. the distribution type fiber-optic enhanced sensitivity device according to claim 1,2,3 or 4, which is characterized in that each opening is also set
It is equipped with screening glass (6), and the screening glass (6) is located at rubber connection sheet (5) outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610213280.3A CN105698696B (en) | 2016-04-07 | 2016-04-07 | Distribution type fiber-optic enhanced sensitivity device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610213280.3A CN105698696B (en) | 2016-04-07 | 2016-04-07 | Distribution type fiber-optic enhanced sensitivity device |
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| Publication Number | Publication Date |
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| CN105698696A CN105698696A (en) | 2016-06-22 |
| CN105698696B true CN105698696B (en) | 2018-10-02 |
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| CN201610213280.3A Active CN105698696B (en) | 2016-04-07 | 2016-04-07 | Distribution type fiber-optic enhanced sensitivity device |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769442A (en) * | 2010-01-18 | 2010-07-07 | 大连理工大学 | Method for monitoring pipeline corrosion |
| CN102168950A (en) * | 2010-12-20 | 2011-08-31 | 中铁隧道集团有限公司 | Method of using distributed optical fibers for advanced monitoring of tunnel surrounding rock deformation |
| KR20120026937A (en) * | 2010-09-10 | 2012-03-20 | (주)지엠지 | Deformation and leakage measuring device for underground pipeline |
| CN102636128A (en) * | 2012-03-30 | 2012-08-15 | 大连理工大学 | Strain hoop sensor used for measuring hoop strain of pipeline |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS628003A (en) * | 1985-07-05 | 1987-01-16 | Isuzu Motors Ltd | Apparatus for measuring displacement of pipe |
-
2016
- 2016-04-07 CN CN201610213280.3A patent/CN105698696B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769442A (en) * | 2010-01-18 | 2010-07-07 | 大连理工大学 | Method for monitoring pipeline corrosion |
| KR20120026937A (en) * | 2010-09-10 | 2012-03-20 | (주)지엠지 | Deformation and leakage measuring device for underground pipeline |
| CN102168950A (en) * | 2010-12-20 | 2011-08-31 | 中铁隧道集团有限公司 | Method of using distributed optical fibers for advanced monitoring of tunnel surrounding rock deformation |
| CN102636128A (en) * | 2012-03-30 | 2012-08-15 | 大连理工大学 | Strain hoop sensor used for measuring hoop strain of pipeline |
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| CN105698696A (en) | 2016-06-22 |
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