CN105973159B - A kind of pipeline distributed fiberoptic sensor initial strain control device and its control method - Google Patents
A kind of pipeline distributed fiberoptic sensor initial strain control device and its control method Download PDFInfo
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- CN105973159B CN105973159B CN201610352693.XA CN201610352693A CN105973159B CN 105973159 B CN105973159 B CN 105973159B CN 201610352693 A CN201610352693 A CN 201610352693A CN 105973159 B CN105973159 B CN 105973159B
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- distributed fiberoptic
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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
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Abstract
A kind of pipeline distributed fiberoptic sensor initial strain control device and control method, including two pulley fixed cells, pulley, counterweight and fibre optical sensor bind utensil.Pulley fixed cell is made of rigid support and annular holder, and annular holder is fastened on pipeline, and there are two pulleys for installation on pulley fixed cell.Fibre optical sensor is bound utensil and is made of rigid housing, flexible inner sleeve and rope body, and rope body winds around the outer surface of rigid housing.Initial strain control method is：Determine that fibre optical sensor is laid with orientation；Two pulley fixed cells are fixed on to the left and right ends of the pipeline；Fibre optical sensor is bypassed into pulley；Fibre optical sensor binding utensil is sleeved on two free ends of fibre optical sensor, is used in combination nylon wire to bundle, is separately connected protrusion component and counterweight；Distributed fiberoptic sensor is adhered to pipe surface.Effect of the present invention is to ensure that the initial strain of fibre optical sensor is in uniform state, improves the measurement accuracy of distributed fiberoptic sensor.
Description
Technical field
The present invention relates to a kind of pipeline distributed fiberoptic sensor initial strain control device and its control methods, belong to knot
Structure health monitoring and field of ocean engineering.
Background technology
Since distributed fiberoptic sensor comes out, since with high reliability, corrosion resistance, transmission loss is low, transmits
Distance exempts from the advantages that electromagnetic interference, and tremendous development has been obtained in monitoring structural health conditions field.The especially line of fibre optical sensor
Shape long range measurements feature becomes one of the desirable technique of various pipes safety monitoring.In the safety monitoring of oil-gas pipeline
In, used fiber optic sensor technology includes mainly three kinds at present：Fiber grating (FBG) technology, distributed fiber optic temperature are surveyed
Amount technology and distributive fiber optic strain monitoring technology.High-precision dynamic strain and temperature may be implemented in fiber grating (FBG) technology
The measurement of degree is a kind of fiber optic monitoring technology of current relative maturity, but this technology still falls within traditional point measurement model
Farmland cannot be satisfied the needs of long range submarine pipeline distributed monitoring.Distributed optical fiber temperature measuring technology is by monitoring pipeline
The exception of environment temperature caused by oil and gas leakage on the way, realizes Distributed probing and the positioning of pipe leakage, but temperature
Any information that pipeline configuration state degenerates (such as structural damage, corrosion) can not be provided by measuring.Distributive fiber optic strain is supervised
Survey technology can provide strain (or stress) information of pipeline overall length any position, be pipeline configuration status assessment and safe early warning
The firsthand information is provided, but this technology requires sensor to must run in structure, the application in oil-gas pipeline is also
In the starting stage.
Distributed strain measuring technique utilizes Brillouin (Brillouin) backscattering principle of optical fiber, passes through optical time domain
Reflection technology (Brillouin Optical time domain reflectometry, BOTDR) or optical time-domain analysis technology
(Brillouin Optical time domain analysis, BOTDA) measures the strain at any point on fiber path.
The spontaneous brillouin scattering that BOTDR technologies utilize, signal is weaker, therefore spatial resolution and measurement accuracy are all relatively low, and BOTDA
Technology makes signal strength increase, spatial resolution and measurement accuracy all greatly improve since stimulated Brillouin scattering is utilized.By
The measuring principle of brillouin distributed optical fiber sensing device is it is found that the distribution that its measurement accuracy depends on spatial resolution internal strain is advised
Rule.Currently, the calibration for strain sensing coefficient, all carries out on the basis of homogeneous strain assumes, also just say, for non-
Homogeneous strain has certain error by the obtained reading of brillouin distributed strain measurement system, and non-with straining
The increase of uniformity coefficient, error can dramatically increase.Especially the dynamic of distributed strain measures, and more assumes that on fiber path
Initial strain be all uniform, be scanned measurement on this basis, once initial strain is unevenly distributed, it will cause
Larger measurement error.In order to obtain accurate measurement result, it should to being laid in the distributed fiberoptic sensor on pipeline
Initial strain is controlled, to ensure that initial strain is uniformly distributed as far as possible.
About the laying of distributed fiberoptic sensor, the country has the sensor distribution method in some specific areas.Specially
Sharp CN102168951A relates to a kind of detachable rigidity and turns flexible optical fibre sensor and its distribution method, is laid in sensor
When by adjust rigid/flexible translation building block so that sensor is in rigid connection state.It is rigid using adjusting after sensor is laid
Property/flexibility translation building block makes sensor be in without rigidly connected free state, rigid/flexible translation building block rigidity is eliminated to knot
Bare fibre or fiber reinforced resinous material flexible package optical fiber sensing element flexible test are realized in the influence of structure Local influence Anlysis.Patent
CN102445160A relates to a kind of long gauge length optical fibre grating scour sensor and its making, installation distribution method and is made of it
Flushing monitoring system.Patent CN104931078A discloses a kind of intensive fiber grating distribution method of high-resolution, Neng Goutong
It crosses dislocation placement and greatly improves spatial resolution.Patent CN102243348A discloses a kind of dress of the laying optical fiber on rail
It sets, by the way that injecting glue pressing device and optical fiber feed arrangement is arranged, realizes optical fiber and facilitate laying on rail, by walking luggage
Laying efficiency can be improved by setting.Patent CN202661693U discloses a kind of laying knot of distribution type fiber-optic in pit shaft freezing wall
Structure, which can effectively successfully be mounted on distribution type fiber-optic in the frost wall of construction freezing method pit shaft, to ensure to be distributed
Formula optical fiber can real-time and accurately monitor temperature, deformation and the force-bearing situation of frost wall.Analyze domestic and international present Research and patent feelings
Condition is it can be found that there is presently no the patents for being related to distributed fiberoptic sensor initial strain control method and device.
Invention content
The present invention is intended to provide a kind of initial strain control dress of distributed fiberoptic sensor of suitable monitoring pipeline safety
It sets and its control method, the strain measurement precision of raising pipeline distributed fiberoptic sensor ensures pipeline configuration safety to reach
Purpose.
The present invention provides a kind of pipeline distributed fiberoptic sensor initial strain control device, it is fixed including two pulleys
Unit, pulley, counterweight and fibre optical sensor bind utensil.
The pulley fixed cell is made of rigid support and annular holder, and the annular holder is fastened on a pipeline
On, its internal diameter of annular holder matches with outer diameter tube.
Respectively there are two pulleys for installation on each pulley fixed cell, and guiding role is played to distributed fiberoptic sensor,
In pulley be mounted on the upper end of rigid support, another pulley is mounted on the inner end of rigid support, the distribution light
Fiber sensor bypasses each pulley, provides guiding role using pulley, distributed fiberoptic sensor can be made parallel with pipe surface
It lays and is in close contact.
Fibre optical sensor binding utensil is made of rigid housing, flexible inner sleeve and rope body, wherein rigid housing by
The arcs body structure of symmetrical shape involutes tubulose, and the flexibility inner sleeve is arranged in rigid housing, distributing optical fiber sensing
Device is sheathed in the flexibility inner sleeve, and the rope body is fastened on the outer set of rigidity.
Fibre optical sensor binding utensil can be fixed on point under the premise of not damaged to distributed fiberoptic sensor
On cloth fibre optical sensor, and then distributed fiberoptic sensor can be connected with rigid support and counterweight, makes distributed light
Fiber sensor is in Uniform Tension state.
Further, for ease of being fixed for connecting the rope body that fibre optical sensor binds utensil, the rigid support it is outer
Side lower part is equipped with a protrusion component.
Further, it is equipped with groove between the outer surface of the rigid housing, is convenient for wound and bound rope body, and can ensure that optical fiber passes
The pressure that sensor each position is subject to is essentially identical.
Further, a flexible inner sleeve part is stretched out in the rigid housing bottom end, and is equipped with a v-component in its end,
For connecting rigid support and counterweight by body of restricting.
Present invention simultaneously provides a kind of initial strain control methods of pipeline distributed fiberoptic sensor, including following step
Suddenly：
Step 1：According to the arrangement and method for construction of monitoring pipeline safety, the laying orientation of distributed fiberoptic sensor is determined and in pipe
It is positioned on road, then polishes and pipe surface and cleaned；
Step 2：Two pulley fixed cells are fixed on by annular holder to a left side for the pipeline of sensor to be laid respectively
Right both ends；
Step 3：Distributed fiberoptic sensor is bypassed into four pulleys successively, and reserves free end；
Step 4：Fibre optical sensor binding utensil is sleeved on to the free end of the distributed fiberoptic sensor, rope is used in combination
The rigid housing of body binding, to apply circumferential pressure to fibre optical sensor, with flexible inner sleeve and the distributed fiberoptic sensor held with a firm grip,
It enables distributed fiberoptic sensor and flexible inner sleeve be in close contact, the fibre optical sensor of side is bound to the v-component of implement end
It is connected with the protrusion component of the side rigid support with rope body；The fibre optical sensor of the other side is bound to the v-component of implement end
With rope one appropriate weight of body hanging counterweight, to be tensioned distributed fiberoptic sensor；
Step 5：Distributed fiberoptic sensor is fixed on pipe surface using binder, this is unloaded after to be bonded dose of solidification
Distributed fiberoptic sensor initial strain control device on pipeline, completes the laying of distributed fiberoptic sensor.
The present invention operation principle be：Based on the distributed fiberoptic sensor of Brillouin scattering principle, measurement accuracy takes
Certainly in the strain uniformity in spatial resolution, therefore the fibre optical sensor for being laid on pipeline, it should be controlled each
Initial strain in section is consistent substantially.The present invention utilizes pulley principle, makes fibre optical sensor by the counterweight of certain mass
In uniform tension state, to achieve the purpose that control initial strain.
Pulley fixed cell is fixed on by its annular holder on pipeline, and distributed fiberoptic sensor passes through fibre optical sensor
Binding utensil be fixed, using constant weight counterweight by fibre optical sensor bind utensil make distributed fiberoptic sensor by
To uniform tensioning, then reuse binder and distributed fiberoptic sensor be fixed on pipe surface, in the procedures of establishment due to
Distributed fiberoptic sensor is in Uniform Tension state to make its initial strain be controlled.
The invention has the advantages that being made by the covering device and its control method distributed that fibre optical sensor is uniform
It is laid in pipe surface, ensures that the initial strain of distributed fiberoptic sensor is in uniform state, improves distributing optical fiber sensing
The measurement accuracy of device, to generate positive effect to monitoring pipeline safety and early warning.
The invention will be further described with reference to the accompanying drawings and examples.
Description of the drawings
Attached drawing 1 is distributed fiberoptic sensor initial strain control device complete layout.
Attached drawing 2 is pulley fixed cell left view.
Attached drawing 3 is fibre optical sensor binding utensil schematic diagram.
Attached drawing 4 is the partial enlarged view of attached drawing 3.
In figure：1, pipeline；2, rigid support；21, component is protruded；3, annular holder；4, pulley；5, distributing optical fiber sensing
Device；6, fibre optical sensor binds utensil；61, v-component；7, counterweight；8, rigid housing；9, flexible inner sleeve
Specific implementation mode
Embodiment one：
The present embodiment provides a kind of pipeline distributed fiberoptic sensor initial strain control devices, are used for distribution type fiber-optic
5 Uniform Tension of sensor is simultaneously laid on the surface of pipeline 1 to be detected, and referring to attached drawing 1,2, it includes mainly that two pulleys are solid
Order member, pulley 4, counterweight 7 and fibre optical sensor bind utensil 6.
The pulley fixed cell is made of rigid support 2 and annular holder 3, and the annular holder 3 is tight using bolt
Gu on pipeline 1, internal diameter specific size is matched by outer diameter tube；The rigid support 2 is by cross bar, upright bar and hound
It is formed by fixedly connecting, cross bar is fixedly connected on the top of annular holder 3, and upright bar is vertically fixed on the outboard end of cross bar, diagonal brace
Bar is fixedly connected between above-mentioned upright bar and cross bar, plays the role of rigidity support to rigid support 2.
For ease of being fixed for connecting the nylon rope that fibre optical sensor binds utensil 6, rigid support 2 described in the present embodiment
Lower part set there are one a length of 50mm, section as the protrusion component 21 of 20mm × 20mm.
There are two pulleys 4 for installation on each pulley fixed cell, mainly play and lead to distributed fiberoptic sensor
To effect, one of pulley is mounted on the upper end of rigid support upright bar, another pulley 4 is mounted on the interior of rigid support cross bar
Side, that is, the right-hand end of the rigid support 2 on the left of installation in fig. 1, alternatively, the rigid support on the right side of installation in fig. 1
2 left-hand end.The distributed fiberoptic sensor 5 suitably bypasses each pulley 4, as shown in Fig. 1, is provided using pulley 4
Guiding role can make the laying parallel with 1 surface of pipeline of distributed fiberoptic sensor 5 and close contact.Two pulley fixed cells
It is fixed on the pipeline left and right ends of sensor to be laid by annular holder respectively relatively.
The fibre optical sensor binding utensil 6 is made of rigid housing 8, flexible inner sleeve 9 and nylon rope, referring to attached drawing
3,4, wherein in a tubular form, being involuted by the semicanal structure of two panels symmetrical shape using rigid housing 8 made of steel, utilizing rubber
Flexible inner sleeve 9 made of glue material is arranged among rigid housing 8, the internal diameter of flexible inner sleeve 9 and distribution made of rubber material
The outer diameter of formula fibre optical sensor 5 is adapted, and is bonded between rigid housing 8 and flexible inner sleeve 9, is enabled it that can not produce relative sliding.
The nylon rope is wound around on 8 outer surface of rigid housing.
In the present embodiment, it is uniformly distributed that there are four wiring groove, groove width 3mm, groove depths on the outer surface of the rigidity housing 8
1mm convenient for binding nylon rope, and can ensure that the pressure that 5 each position of fibre optical sensor is subject to is essentially identical.
In the present embodiment, 9 part of flexible inner sleeve is stretched out in 8 bottom end of the rigidity housing, and sets there are one v-component 61,
For connecting rigid support 2 or counterweight 7 by nylon rope.
Fibre optical sensor binding utensil 6 can be fixed under the premise of not damaged to distributed fiberoptic sensor 5
On distributed fiberoptic sensor 5, and then distributed fiberoptic sensor can be connected with rigid support 2 or counterweight 7, makes distribution
Formula fibre optical sensor 5 is in Uniform Tension state.
The present embodiment provides a kind of initial strain control method of pipeline distributed fiberoptic sensor, including following step simultaneously
Suddenly：
Step 1：According to the arrangement and method for construction of monitoring pipeline safety, determine the laying orientation of distributed fiberoptic sensor 5 and
It is positioned on pipeline 1, then polishes and 1 surface of pipeline and cleaned.
Step 2：Two pulley fixed cells are fixed on by annular holder 3 to the pipeline 1 of sensor to be laid respectively
Left and right ends.
Step 3：Distributed fiberoptic sensor 5 is bypassed into four pulleys 4 according to such as 1 mode of attached drawing according to certain sequence, and
Reserve free end.
Step 4：Fibre optical sensor binding utensil 6 is sleeved on to two free ends of above-mentioned distributed fiberoptic sensor 5,
Nylon rope is bundled at each transverse concave groove, to apply circumferential pressure to fibre optical sensor, makes two panels semicanal close apposition,
Rubber flexible inner sleeve of holding with a firm grip and distributed fiberoptic sensor 5 enable fibre optical sensor and rubber flexible inner sleeve be in close contact.By optical fiber
The v-component 61 of 6 end of sensor binding utensil and the protruding member 21 of the rigid support 2 on the left of attached drawing 1 use nylon rope
Connection；V-component 61 in 6 end of fibre optical sensor binding utensil positioned at the right side of attached drawing 1 is fished constant weight with nylon rope
Counterweight 7, to be tensioned distributed fiberoptic sensor 5.
Step 5：Distributed fiberoptic sensor 5 is fixed on 1 surface of pipeline using binder (such as epoxy resin), waits gluing
The pipeline distributed fiberoptic sensor initial strain control device described in the present embodiment is unloaded after knot agent solidification, completes distributed light
The laying of fiber sensor.
Claims (5)
1. a kind of pipeline distributed fiberoptic sensor initial strain control device, it is characterised in that：It is fixed including two pulleys single
Member, pulley, counterweight and fibre optical sensor bind utensil, and the pulley fixed cell is made of rigid support and annular holder,
The annular holder is fastened on a pipeline, its internal diameter of annular holder matches with outer diameter tube, on each pulley fixed cell
There are two pulleys for each installation, play guiding role to distributed fiberoptic sensor, one of pulley is mounted on rigid support
Upper end, another pulley are mounted on the inner end of rigid support, and the distributed fiberoptic sensor bypasses each pulley, the light
Fiber sensor is bound utensil and is made of rigid housing, flexible inner sleeve and rope body, wherein arcs of the rigid housing by symmetrical shape
Structure involutes tubulose, and the flexibility inner sleeve is arranged in rigid housing, and distributed fiberoptic sensor is sheathed in the flexibility
In set, the rope body is fastened on the outer set of rigidity.
2. a kind of pipeline distributed fiberoptic sensor initial strain control device according to claim 1, it is characterised in that：
The outer lower portion of the rigid support is equipped with a protrusion component.
3. a kind of pipeline distributed fiberoptic sensor initial strain control device according to claim 1, it is characterised in that：
It is equipped with groove between the outer surface of the rigidity housing.
4. a kind of pipeline distributed fiberoptic sensor initial strain control device according to claim 1, it is characterised in that：
A flexible inner sleeve part is stretched out in the rigidity housing bottom end, and is equipped with a v-component in its end.
5. a kind of pipeline distributed fiberoptic sensor initial strain control device according to any one of claims 1-4
Control method, it is characterized in that：Include the following steps：
Step 1：According to the arrangement and method for construction of monitoring pipeline safety, the laying orientation of distributed fiberoptic sensor is determined and on pipeline
It is positioned, then polishes and pipe surface and cleaned；
Step 2：Two pulley fixed cells are fixed on by annular holder to the left and right two of the pipeline of sensor to be laid respectively
End；
Step 3：Distributed fiberoptic sensor is bypassed into four pulleys successively, and reserves free end；
Step 4：Fibre optical sensor binding utensil is sleeved on to the free end of the distributed fiberoptic sensor, rope body bundle is used in combination
Rigid housing is tied up, to apply circumferential pressure to fibre optical sensor, with flexible inner sleeve and the distributed fiberoptic sensor held with a firm grip, enables and dividing
Cloth fibre optical sensor is in close contact with flexible inner sleeve, and the fibre optical sensor of side is bound the v-component of implement end and is somebody's turn to do
The protrusion component of side rigid support passes through body connection of restricting；The v-component that the fibre optical sensor of the other side is bound to implement end is used
The counterweight for one appropriate weight of body hanging of restricting, to be tensioned distributed fiberoptic sensor；
Step 5：Distributed fiberoptic sensor is fixed on pipe surface using binder, this pipeline is unloaded after to be bonded dose of solidification
Upper distributed fiberoptic sensor initial strain control device, completes the laying of distributed fiberoptic sensor.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110285769B (en) * | 2019-07-12 | 2020-12-29 | 南京大学 | Range expanding device for distributed optical fiber strain sensing |
| CN110702212B (en) * | 2019-10-30 | 2021-11-09 | 中石化石油工程技术服务有限公司 | Oil-gas pipeline optical fiber calibration method combining fixed seismic source device and phi-OTDR sensing system |
| CN115326130A (en) * | 2022-07-06 | 2022-11-11 | 山东大学 | Deformation measurement early warning system and method for deep-buried tunnel crossing active fault |
| CN116719138B (en) * | 2023-08-04 | 2023-10-20 | 中国电力科学研究院有限公司 | Optical fiber laying equipment, underground pipeline positioning method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6434314B1 (en) * | 2001-03-13 | 2002-08-13 | 3M Innovative Properties Company | Force equalizing filament clamp |
| CN101963493A (en) * | 2009-07-23 | 2011-02-02 | 上海启鹏化工有限公司 | Fiber strain sensitive structure and manufacturing method thereof |
| CN102168951B (en) * | 2010-12-22 | 2013-01-30 | 大连理工大学 | Detachable rigidity-to-flexibility optical fiber sensor and arrangement method thereof |
| CN102207449A (en) * | 2011-03-16 | 2011-10-05 | 东南大学 | Test method for bonding stress between fiber reinforced plastic bar and concrete |
| CN103337782A (en) * | 2013-07-19 | 2013-10-02 | 北京信息科技大学 | Method for measuring strain by utilizing output longitudinal mode of short-cavity optical fiber laser |
| CN103438815B (en) * | 2013-08-02 | 2015-07-08 | 东南大学 | Durable and long-scale-distance fiber grating sensor and manufacturing method thereof |
| CN103616742B (en) * | 2013-12-11 | 2015-06-17 | 李智忠 | Method for fabricating chirped fiber grating |
| CN104596436B (en) * | 2015-01-12 | 2018-05-01 | 武汉理工大学 | Magnetic-type fiber Bragg grating strain sensor pastes fixing device and method |
| CN205825908U (en) * | 2016-05-25 | 2016-12-21 | 中石化石油工程设计有限公司 | A kind of pipeline distributed fiberoptic sensor initial strain controls device |
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Effective date of registration: 20210205 Address after: 100027 Chaoyangmen North Street, Chaoyang District, Chaoyang District, Beijing Patentee after: China Petroleum & Chemical Corp. Patentee after: SINOPEC PETROLEUM ENGINEERING DESIGN Corp. Patentee after: MARINE OIL PRODUCTION PLANT, SINOPEC SHENGLI OILFIELD Co.,Ltd. Address before: 257026 No. 49, Ji'nan Road, Dongying District, Shandong, Dongying Patentee before: SINOPEC PETROLEUM ENGINEERING DESIGN Corp. Patentee before: MARINE OIL PRODUCTION PLANT, SINOPEC SHENGLI OILFIELD Co.,Ltd. |