CN206959796U - A kind of long-distance distributed optical fiber spatial attitude monitors sensor - Google Patents
A kind of long-distance distributed optical fiber spatial attitude monitors sensor Download PDFInfo
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- CN206959796U CN206959796U CN201720442618.2U CN201720442618U CN206959796U CN 206959796 U CN206959796 U CN 206959796U CN 201720442618 U CN201720442618 U CN 201720442618U CN 206959796 U CN206959796 U CN 206959796U
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 67
- 238000012544 monitoring process Methods 0.000 claims abstract description 42
- 239000002131 composite material Substances 0.000 claims abstract description 26
- 229920002521 macromolecule Polymers 0.000 claims abstract description 25
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 14
- 239000010959 steel Substances 0.000 claims abstract description 14
- 238000012360 testing method Methods 0.000 claims abstract description 12
- 238000003856 thermoforming Methods 0.000 claims abstract description 4
- 239000000835 fiber Substances 0.000 claims description 13
- 230000005540 biological transmission Effects 0.000 claims description 6
- -1 polyethylene Polymers 0.000 claims description 4
- 239000002861 polymer material Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 239000004743 Polypropylene Substances 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- 239000003365 glass fiber Substances 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 238000010008 shearing Methods 0.000 claims description 2
- 238000005728 strengthening Methods 0.000 claims description 2
- 239000011521 glass Substances 0.000 claims 1
- 210000003205 muscle Anatomy 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000011156 evaluation Methods 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 230000002787 reinforcement Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009795 derivation Methods 0.000 description 2
- 230000004069 differentiation Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000012783 reinforcing fiber Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
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- 230000035945 sensitivity Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
The utility model provides a kind of long-distance distributed optical fiber spatial attitude monitoring sensor, long-distance distributed optical fiber spatial attitude monitoring sensor is single mode strain optical fiber, a loose sheath single mode optical fiber temperature and a branch of seven reinforcements steel strand wires that embedded four 90 degree of intervals are circumferentially laid during macromolecule composite reinforcing thermoforming.Longitudinal strain on 4 directions of single mode strain optical fiber measurement sensor, single mode optical fiber temperature test environment temperature is simultaneously modified to strain, based on the spatial attitude for answering variable curvature and Differential Geometry relation segment reconstruction sensor.The utility model long-distance distributed optical fiber spatial attitude monitoring sensor is laid in the large-scale structures such as roadbed, submarine optical fiber cable, the structural strain of dozens of kilometres can be monitored, conversion based on strain to curvature, the on-line monitoring of structure entirety posture can be achieved, the safety monitoring and evaluation to structure have important engineering significance.
Description
Technical field
The utility model belongs to structure monitoring field, is related to a kind of long-distance distributed optical fiber spatial attitude monitoring sensing
Device.
Background technology
The linear structures such as long distance pipeline, submarine optical fiber cable and long range roadbed belong to great infrastructure, its normal fortune
Battalion and national economy and life are closely related.These long range linear structures during long-term military service by human factor, from
Transition of right disaster and environment etc. influence, it may occur that influence the large deformation of structure safety, ultimately result in structural failure.As ground sinks
Excessive caused pipe deforming booster, the uneven pliable or derailment accident of driving caused by settlement of subgrade, because of tide, wheel drop
The accidents such as the disconnected cable power-off of submarine optical fiber cable caused by secure lashed cable, all cause certain property loss and casualties.Structure
Failure is a damage development process, is deformed using effective means monitoring of structures, structure entirety posture is held, to the safety of structure
Situation is assessed, and disaster accident is given warning in advance, and has important engineering significance.
Current this kind of great infrastructure establishes structural safety monitoring or detecting system mostly, main to include manually patrolling
Inspection, local deformation (longitudinal strain or sedimentation) monitoring, GPS deformation monitorings and full distributed longitudinal strain monitoring etc..Manually patrol
Inspection belongs to detection technique, the artificial detection cycle is long, labor intensity is high and Detection results are related to testing staff's quality etc. be present
Shortcoming；Local deformation monitoring technology, such as local Fiber Bragg Grating technology and single-point settlement sensor can only be entered to structure partial form
Row monitoring, be not suitable for the monitoring of long range linear engineering full size；GPS deformation monitorings belong to surface deformation monitoring, can not equally cover
Lid long range linear structure.Distribution type fiber-optic Brillouin sensing technology has long measuring distance, anti-electromagnetic field interference, good endurance
The features such as, applied over long distances, in massive structure safety monitoring, but most of distributed sensors stress at present
In structure longitudinal stress strain testing, and the monitoring for structure space form passes, it is necessary to lay multiple distribution type fiber-optics simultaneously
Sensor, causes monitoring system to integrate costly, the difficulties such as difficulty is big.For structural safety monitoring linear over long distances, it is badly in need of a kind of
Meet the long-distance distributed spatial attitude monitoring sensor of engineering installation requirements.At present have pertinent literature report using from
Scattered fiber-optic grating sensor carries out spatial attitude monitoring (Zhu Xiaojin, Lu Meiyu, Zhao Xiaoyu etc., the machine space of small-scale structure
Tool arm vibration shape three-dimensionalreconstruction algorithm and visual analyzing, Journal of System Simulation, 2009,21 (15)：4706-4709), the party
Method is because of only several discrete measuring points, it is difficult to carries out the monitoring of large-scale structure spatial attitude, using distribution type fiber-optic Brillouin sensing
The research that technology carries out the monitoring of large-scale structure spatial attitude yet there are no relevant report.
Utility model content
In view of the shortcomings of the prior art, the utility model provides a kind of long-distance distributed optical fiber spatial attitude monitoring sensing
Device and engineering implementation method, the sensor twist four single-mode fibers, a single-mode fiber with loose sheath and a branch of 7 steel
Line is embedded in a diameter of 5-8mm macromolecule composite reinforcing, and 4 single-mode fibers are as strain sensing optical fiber measurement optical fiber phase
Answer strain and the temperature information of position；Engineering implementation method is to carry out temperature adjustmemt and mutation to strain testing data in sensor
Identifying processing, based on strain-curvature geometrical relationship, segment-and-region-based parses the spatial attitude of the sensor.
In order to achieve the above object, the technical solution of the utility model is：
A kind of long-distance distributed optical fiber spatial attitude monitors sensor, including four single modes strain optical fiber, one carry
The single mode optical fiber temperature of loose sheath, a branch of seven steel strand wires, macromolecule composite reinforcing, two fibre distribution boxs and two transmission lights
Cable.
Described single mode strain optical fiber, single mode optical fiber temperature and seven steel strand wires are during macromolecule composite reinforcing thermoforming
It is laid in inside macromolecule composite reinforcing.
90 degree described of four single modes strain optical fiber interval is circumferential to be laid in macromolecule composite reinforcing, away from macromolecule composite reinforcing
Excircle 1.5mm, every single mode strain optical fiber is as the strain sensing unit in sensor, for 4 up and down, structure
The strain testing in direction and strain-curvature attitude reconstruction.Single mode optical fiber temperature of described one with loose sheath and a branch of straight
Footpath is that 2mm seven steel strand wires are laid in the centre position of macromolecule composite reinforcing, and single mode optical fiber temperature is located on center line；It is single
Mould optical fiber temperature is as the temperature sensing unit in sensor, for testing local environment temperature and 4 strain sensing units
Temperature-compensating；Seven steel strand wires are used for the tension and shearing strength for strengthening sensor.The both ends of macromolecule composite reinforcing and optical fiber point
Line box connects, and the mutual welding of the optical fiber in fibre distribution box forms a light path, and is connected with transmission cable.
High polymer material in described macromolecule composite reinforcing is the material of the good endurances such as polyethylene, polypropylene, in heat
Compound with glass fibre in forming process, according to monitoring needs, the internal diameter of macromolecule composite reinforcing is 5-8mm.
Using the engineering implementation method of above-mentioned long-distance distributed optical fiber spatial attitude monitoring sensor, including following step
Suddenly：
The first step, long-distance distributed optical fiber spatial attitude monitoring sensor are laid in the structure, with structure cooperative transformation.
Second step, long-distance distributed optical fiber spatial attitude monitor four single modes strain optical fiber real-time testing in sensor
The initial strain value of i-th of measuring point four direction.
3rd step, the single mode optical fiber temperature with loose sheath are carried out to the initial strain value of four single mode strain test optical fibers
Temperature adjustmemt, the initial strain value of revised strain value and sensor carry out difference, segmentation calibration strain sudden change region, are based on
Strain-curvature relationship, the spatial attitude of segment reconstruction sensor.
Effect and benefit of the present utility model are that long-distance distributed optical fiber spatial attitude monitors sensor directly by interior
The strain in portion four single-mode fiber measurement sensors, 4 directions, based on strain-curvature geometrical relationship, parse the space of sensor
Form, while the internal only measuring environment temperature of the single-mode fiber with loose sheath, to the strain value of four single-mode fiber measurements
Carry out temperature-compensating.Long-distance distributed optical fiber spatial attitude monitoring sensor is laid in long distance pipeline, submarine optical fiber cable and roadbed
Etc. in linear structure, the space geometry deformation information of corresponding construction can be directly obtained, safety monitoring and evaluation tool to structure
There is important meaning.
Brief description of the drawings
Fig. 1 is long-distance distributed optical fiber spatial attitude monitoring sensor construction schematic diagram.
Fig. 2 is the sectional view along A-A faces.
Fig. 3 (a) is the structure under long-distance distributed optical fiber spatial attitude monitoring i-th of micro- section of non-stress of sensor
Figure.
Fig. 3 (b) is the structure under long-distance distributed optical fiber spatial attitude monitoring i-th of micro- section of stress of sensor
Figure.
In figure：1 single mode strains optical fiber；2 single mode optical fiber temperatures；3 seven steel strand wires；4 macromolecule composite reinforcings；5 fiber-optic sub-lines
Box；6 transmission cables.
Embodiment
Specific embodiment of the present utility model is described in detail below in conjunction with technical scheme and accompanying drawing.
Fig. 1 is that long-distance distributed optical fiber spatial attitude monitors sensor construction schematic diagram.
A kind of described long-distance distributed optical fiber spatial attitude monitors sensor in the thermoforming process of macromolecule composite reinforcing 4
In, four single modes are strained into optical fiber 1 and are circumferentially laid in as strain sensing unit interval in macromolecule composite reinforcing 4 for 90 degree, away from height
The excircle 1.5mm of molecule composite reinforcing 4；The single mode optical fiber temperature 2 for carrying Loose tube by one simultaneously and the 7 of a diameter 2mm
Silk steel strand wires 3 are laid in the home position of macromolecule composite reinforcing 4, leading-out terminal incoming fiber optic junction box 5, in fibre distribution box 5
Optical fiber be interconnected to form a light path and with the welding of transmission cable 6, wherein the diameter of macromolecule composite reinforcing 4 is according to monitoring needs
Can be 5-8mm.Wherein the single mode optical fiber temperature 2 with loose sheath is used as temperature sensing unit, diameter 2mm 7 steel strand wires 3
For the enhancement unit of sensor.
Fig. 3 (a) and Fig. 3 (b) is i-th of the micro- section of work signal of long-distance distributed optical fiber spatial attitude monitoring sensor
Figure.
Described long-distance distributed optical fiber spatial attitude monitoring sensor is laid in structure, with structure cooperative transformation.
Scheme in (a), i-th of micro- segment length of sensor is Li, a diameter of D of sensor.Scheme i-th of micro- section of bending that (b) is sensor
When sensor ab sections schematic diagram, four strain perceive i-th of measuring point real-time testing of unit strains be respectively εai, εbi,
εci, εdi.By deformation geometry relation, it is known that：
Li=ρabi×αabi (1)
In formula (1)-(3), kabi, ρabi, αabiThe respectively curvature of i-th of micro unit ab section of sensor, amount of deflection and micro-
Central angle corresponding to circular arc during first deformation；ΔLiThe deformation quantity occurred for sensor.
As above derive, the curvature k of cd sections during the micro- section of bending of i-th of sensorcdi, derivation result is as follows：
In formula, ρcdiFor the micro- section of bending of i-th of sensor when cd sections amount of deflection.
Described long-distance distributed optical fiber spatial attitude monitors sensor in Practical Project, and environment temperature changes
When, it is also necessary to unit testing strain is perceived to four strains and carries out temperature adjustmemt.The temperature spirit of temperature sensing unit in sensor
Sensitivity coefficient is KT, the ga(u)ge factor of strain sensing unit is Kε.Scheme i-th of infinitesimal temperature point of sensor in (b)
Increment is Δ Ti, then Brillouin shift increment Delta fti=Δ Ti×KT, strain sensing unit sense temperature and should simultaneously in sensor
Power load, it is Δ F that optical fiber Brillouin (FBG) demodulator, which is not added with differentiation and parses overall Brillouin shift increment,i, then have caused by stress
Brillouin shift increment is：Δfεi=Δ Fi-Δfti, corresponding strain increment (sensing unit perception strain value) ε=Δ fεi/
Kε, substitute into formula (3) and formula (4) can obtain the curvature value after temperature adjustmemt.
Described long-distance distributed optical fiber spatial attitude monitoring sensor is monitoring the curvature of sensor both direction
Value kabi,kcdi, the curvature of both direction is converted into the curvature of spaceAccording to above-mentioned derivation, so that it may
To obtain the curvature of space of sensor any point opening positionI=
1-n, n are the strain measuring point number of sensor, are then based on mathematical differentiation geometrical relationship, and utilization space curvature information and sensor are surveyed
Coordinate (the x of the spatial attitude, i.e. i-th of measuring point of known sensor of point distance reconstruct sensori,yi,zi) and i-th point of song
Rate component kabi,kcdi, sensor-based geometry deformation relation can be in the hope of the coordinate (x of (i+1) individual measuring pointi+1,yi+1,
zi+1), then reconstruct the whole positional information of sensor.
Described long-distance distributed optical fiber attitude monitoring sensor and engineering implementation method are in engineer applied, in space
Before answering variable curvature to convert, the strain value of sensing unit also needs to be pre-processed in addition to temperature adjustmemt in sensor, strain value
After temperature adjustmemt is complete and sensor initial strain value carries out difference, and the region for having obvious increment to strain is segmented, Ran Houfen
The above-mentioned attitude reconstructions of Duan Jinhang.
Claims (3)
1. a kind of long-distance distributed optical fiber spatial attitude monitors sensor, it is characterised in that described long-distance distributed light
Fine spatial attitude monitors sensor, including four single modes strain optical fiber (1), a single mode optical fiber temperature (2) with loose sheath,
A branch of seven steel strand wires (3), macromolecule composite reinforcing (4), two fibre distribution boxs (5) and two transmission cables (6)；
Described single mode strain optical fiber (1), single mode optical fiber temperature (2) and seven steel strand wires (3) macromolecule composite reinforcing (4) it is hot into
It is internal that macromolecule composite reinforcing (4) is laid in during type；
Described four single modes strain optical fiber (1) is spaced 90 degree and is circumferentially laid in macromolecule composite reinforcing (4), compound away from macromolecule
The excircle 1.5mm of muscle (4), every single mode strain optical fiber (1) is as the strain sensing unit in sensor, above and below structure
The strain testing and strain-curvature attitude reconstruction in the direction of left and right 4；Described one carries the single mode optical fiber temperature of loose sheath
(2) and during a branch of seven steel strand wires (3) are laid in the centre position of macromolecule composite reinforcing (4), and single mode optical fiber temperature (2) is located at
On heart line；Single mode optical fiber temperature (2), should for testing local environment temperature and 4 as the temperature sensing unit in sensor
Become the temperature-compensating of sensing unit；Seven steel strand wires (3) are used for the tension and shearing strength for strengthening sensor；Described macromolecule
The both ends of composite reinforcing (4) are connected with fibre distribution box (5), and the mutual welding of the optical fiber in fibre distribution box (5) forms a light path,
And it is connected with transmission cable (6)；
Described macromolecule composite reinforcing (4) internal diameter is 5-8mm.
A kind of 2. long-distance distributed optical fiber spatial attitude monitoring sensor according to claim 1, it is characterised in that institute
High polymer material in the macromolecule composite reinforcing (4) stated is polyethylene, polypropylene, high polymer material and glass during thermoforming
Glass fiber composite.
3. a kind of long-distance distributed optical fiber spatial attitude monitoring sensor according to claim 1 or 2, its feature exist
In a diameter of 2mm of described seven steel strand wires (3).
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| CN106885529A (en) * | 2017-04-26 | 2017-06-23 | 大连理工大学 | A kind of long-distance distributed optical fiber spatial attitude monitors sensor and engineering implementation method |
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