CN109655982A - A kind of armouring strain monitoring optical cable and earthing monitoring and answer force calibration method - Google Patents
A kind of armouring strain monitoring optical cable and earthing monitoring and answer force calibration method Download PDFInfo
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- CN109655982A CN109655982A CN201910089268.XA CN201910089268A CN109655982A CN 109655982 A CN109655982 A CN 109655982A CN 201910089268 A CN201910089268 A CN 201910089268A CN 109655982 A CN109655982 A CN 109655982A
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- Prior art keywords
- optical cable
- armouring
- strain
- steel
- monitoring optical
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Classifications
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- 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
- 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
- G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
Abstract
The invention discloses a kind of armouring strain monitoring optical cable and earthing monitoring and answer force calibration method, including fibre core (1), steel Loose tube (3), wire armoring (4), the oversheath (5) set gradually by center to outer ring, factice for filling (2) are provided between the fibre core (1) and steel Loose tube (3)；The present invention has very strong mechanical performance, tension, resistance to compression, and there is outstanding rat preservative ability, survival rate after substantially increasing its directly buried installation, no sliding is fitted closely between each structure division of optical cable simultaneously, the transfer performance for effectively ensuring stress, so that strain data accuracy with higher and sensitivity.
Description
Technical field
The present invention relates to a kind of armouring strain monitoring optical cable and earthing monitoring and answer force calibration method, belong to structural health,
Geological Hazards Monitoring field.
Background technique
With the progress of society and economic development, a large amount of engineering construction is unfolded in various regions, more strange, scales
Mega structure object appears in all over the world.Due to designing the defect of upper, construction quality etc., engineering works is caused to apply
It deforms during work and operation, if deformation is gone beyond the limit of, just will affect the use of building, or even the things such as collapsing occur
Therefore.Since deformation monitoring can be to judge that the safety of engineering works is submitted necessary information, so that the meaning of deformation monitoring
It is more important.Geological Hazards Monitoring refers to various technology and methods, measurement, monitoring geological disaster activity and various
The work of risk factor dynamic change is the important evidence of prediction geological disaster, is the important content of disaster reduction and prevention.
Distributed optical fiber sensing technology is widely used in building structure, geological disaster as a kind of novel monitoring technology
Equal fields, largely compensate for the deficiency of traditional monitoring means, have at low cost, corrosion-resistant, high-low temperature resistant, anti-electromagnetism dry
It disturbs, the advantages such as low-loss transmission is remote.Strain monitoring optical cable based on the technology can be customized according to engineering demand, and optical cable can be certainly
By laying, dimensional effect is minimum, the deformation monitoring being particularly suitable for inside large-scale Rock And Soil.But existing strain monitoring optical cable machine
Tool performance is poor, and the survival rate after directly buried installation is low, and sliding is easy between each structure division of optical cable.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the present invention provide it is a kind of it is light-weight, intensity is big, answers
The accuracy of parameter evidence and the armouring strain monitoring optical cable and earthing of high sensitivity monitor and answer force calibration method, and the present invention is extensive
Strain monitoring applied to directions such as landslide, ground sedimentation, malformations.
Technical solution: to achieve the above object, the technical solution adopted by the present invention are as follows:
A kind of armouring strain monitoring optical cable, mainly by oversheath, wire armoring, wire armoring, factice for filling, fibre core group
At.
The material of the oversheath is PE material, and these short-range structure features of HDPE (high density polyethylene (HDPE)) determine it
With following basic performance: density of material is higher, and good crystallinity, crystallinity is big, and molecule interlayer active force is big.Macro manifestations are material
Expect that density is high, the satisfactory mechanical properties such as tensile strength, material hardness is high, and abrasion resistance properties are excellent, and resistance to chemical corrosion is good.
The wire armoring, according to the difference of steel wire (steel strand wires) diameter (0.3-0.6mm), armouring radical used
(8-12 root) be not also identical, it is contemplated that special to use stainless steel wire as armoring material the problems such as antirust, intensity.
The steel Loose tube is protected to optical fiber using steel sleeve, thickness of steel pipe should between 0.15-0.20mm,
While reinforcing cable strength, sensitivity of the optical cable to strain is also considered, therefore diameter of steel tube should not be too big, in 0.8-
Between 1.1mm.
The fibre core selects general single mode light using simple optical fiber as fibre core to exclude the interference of extra fibre core
Fine (G657).
The strain monitoring optical cable can be used for the monitoring of geological disaster, and monitoring mainly includes two parts --- distribution
Formula optical fiber demodulating apparatus and armouring strain monitoring optical cable of the invention；The distribution type fiber-optic demodulated equipment is based on Brillouin
The measurement of scatterometry technology (BOTDA) progress distributing optical fiber sensing；And armouring strain monitoring optical cable of the present invention is then used as and answers
Stress-strain induction element and optic communication carrier.
The present invention compared with prior art, has the advantages that
1) optical cable has wire armoring and two high-strength structures of steel sleeve, has very high tensile strength, simultaneously
With good rat preservative ability, survival rate and service life after significantly increasing fiber cable laying are highly suitable for engineering
The monitoring of scene, especially infrastructure；
2) no sliding is fitted closely between various pieces of the present invention, while guaranteeing high-intensitive, ensure that strain transmitting
Sensitivity and accuracy.Factice for filling is added in steel Loose tube while protecting fibre core, it is ensured that the stress of fibre core passes
It passs；Steel strand wires in wire armoring wind around steel Loose tube outer surface so that wire armoring formed with steel Loose tube it is similar
" locked " structure；HDPE oversheath is hot sticky whole in being formed on steel wire armoured steel strand wires, it is ensured that close between various pieces
Fitting is without sliding.
3) for diameter of the invention only between 3-5mm, weight is about 17-20kg/km, excellent with small in volume
Gesture.
4) present invention installation is simple, measurement accuracy is high, stability is high, the ratio of performance to price is good.
Detailed description of the invention
Fig. 1 is armouring strain monitoring optical cable sectional schematic diagram of the present invention
Fig. 2 is each schematic diagram of a layer structure of armouring strain monitoring optical cable
Fig. 3 tests a layout drawing
Fig. 4 depth earthing optical cable frequency curve variation diagram
Fig. 5 tests two layout drawings
Fig. 6 frequency-strain stress relation corresponding diagram
Wherein: 1-fibre core；2-factice for filling；3-steel Loose tubes (0.9mm)；4-wire armorings (0.3mm x 12
Root)；5-HDPE oversheaths, 6-armouring strain monitoring optical cables, 7-distribution type fiber-optic demodulated equipments.
Specific embodiment
In the following with reference to the drawings and specific embodiments, the present invention is furture elucidated, it should be understood that these examples are merely to illustrate this
It invents rather than limits the scope of the invention, after the present invention has been read, those skilled in the art are to of the invention various
The modification of equivalent form falls within the application range as defined in the appended claims.
A kind of armouring strain monitoring optical cable, as shown in Figure 1, 2, including fibre core (1), the steel pine set set gradually from inside to outside
(3), wire armoring (4), oversheath (5) are managed, the fibre core (1) is single mode optical fiber, and factice for filling (2) is filled in the fibre core
(1) between steel Loose tube (3), the factice for filling (2) uses LHAX ointment；The oversheath (5) uses high-density polyethylene
Alkene is made；Steel wire diameter 0.3mm in the wire armoring (4), in another embodiment of the invention, steel wire diameter 0.4mm,
In another embodiment of the invention, steel wire diameter 0.6mm, steel wire radical 12 in the wire armoring (4), in the present invention
Another embodiment in, steel wire radical 8, in still another embodiment of the invention, steel wire radical 10；The steel Loose tube
(3) steel sleeve is used, the thickness of steel pipe of the steel Loose tube (3) should be in 0.18mm, in another embodiment of the invention, steel pipe
Wall thickness is in 0.15mm, and in still another embodiment of the invention, thickness of steel pipe is between 0.20mm；The steel Loose tube (3)
Diameter is in 0.1mm, and in another embodiment of the invention, the diameter of steel Loose tube (3) is in 0.8mm, of the invention again another
In embodiment, the diameter of steel Loose tube (3) is in 1.1mm.
Experiment one: deep earthing experiment
A kind of deep earthing monitoring method using armouring strain monitoring optical cable, as shown in figure 3, comprising the following steps:
Step 1: armouring strain monitoring optical cable (6) is connect with distribution type fiber-optic demodulated equipment (7), wherein armouring strain
Optical cable (6) are monitored as strain induction element and optic communication carrier；Distribution type fiber-optic demodulated equipment (7) is dissipated using based on Brillouin
Penetrate the measurement that measuring technique carries out distributing optical fiber sensing；
Step 2: excavating a long groove with bull-dozer, it is about 50m, depth is in 0.5m or so；
Step 3: being horizontally arranged armouring strain monitoring optical cable (6) along groove, keeps straight non-warping, pass through distributed light
Fine demodulated equipment (7) records primary data；
Advance Step 4: bull-dozer is used perpendicular to armouring strain monitoring optical cable (6) cloth set direction, gradually pushes away from the distant to the near
It shovels above a large amount of soil to armouring strain monitoring optical cable (6), after recording each earthing by distribution type fiber-optic demodulated equipment (7)
Data.
Step 5: the data of analysis and observation record；
As shown in figure 4, having recorded the situation of change after optical cable buries soil at 5 times, this can be illustrated by the experiment
Invention optical cable is after the variation of surrounding soil stress, and data have significant change compared to original state, and then the optical cable can be used
In the monitoring and warning of geological disaster event.
Experiment two: stress calibration experiments
A kind of armouring strain monitoring optical cable answers force calibration method, as shown in figure 5, respectively initial position, middle position,
Terminal position takes the length of 3m, and side is fixed on fixed position, and the other side is fixed on micro- positioning unit, using micro- positioning unit
The strain displacement Δ of upper application calculates applied strain, and ε=Δ L/L, ε indicates the strain applied, Δ L indicates stretching for test
Long amount, L indicate specific length；The error of elongation is set as ± 0.01mm, length L is ± 5mm.Frequency strains formula are as follows:
Y=27.888x-1.9843,
Wherein, y indicates strain, and x indicates difference on the frequency.
It is horizontal to correspond respectively to 100,200,300 μ ε by elongation the Δ L=0.3,0.6 and 0.9mm of test.
According to the principle of optical fiber sensing technology, optical fiber frequency and suffered stress are proportional, can by the calibration of stress
Quantitatively to obtain pertinency factor, i.e. 1MHz=27.888 μ ε, as shown in Figure 6.
The present invention compared to current strain monitoring optical cable for, with very strong mechanical performance, tension, resistance to compression, and
And there is outstanding rat preservative ability, the survival rate after substantially increasing its directly buried installation, while each structural portion of optical cable to divide it
Between fit closely no sliding, effectively ensure the transfer performance of stress so that strain data accuracy with higher with it is sensitive
Degree.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (8)
1. a kind of armouring strain monitoring optical cable, it is characterised in that: fibre core (1), steel including being set gradually by center to outer ring are loose
Casing (3), wire armoring (4), oversheath (5) are provided with factice for filling (2) between the fibre core (1) and steel Loose tube (3)；
The steel strand wires radical 8-12 root in steel strand wires diameter 0.3-0.6mm, the wire armoring (4) in the wire armoring (4)；Institute
Steel Loose tube (3) are stated using steel sleeve, the thickness of steel pipe of the steel Loose tube (3) should be between 0.15-0.20mm；The steel pine
The diameter of casing (3) is between 0.8-1.1mm.
2. armouring strain monitoring optical cable according to claim 1, it is characterised in that: the steel strand wires in the wire armoring (4)
Steel Loose tube (3) outer surface is wound around, so that wire armoring (4) and steel Loose tube (3) form " locked " structure；Oversheath
(5) hot sticky whole in being formed on the steel strand wires of wire armoring (4).
3. armouring strain monitoring optical cable according to claim 1, it is characterised in that: the oversheath (5) is poly- using high density
Ethylene is made.
4. armouring strain monitoring optical cable according to claim 1, it is characterised in that: the factice for filling (2) is using LHAX oil
Cream.
5. armouring strain monitoring optical cable according to claim 1, it is characterised in that: the fibre core (1) is single mode optical fiber.
6. a kind of deep earthing monitoring method using armouring strain monitoring optical cable described in claim 1, which is characterized in that including with
Lower step:
Step 1: armouring strain monitoring optical cable (6) is connect with distribution type fiber-optic demodulated equipment (7), wherein armouring strain monitoring
Optical cable (6) is as strain induction element and optic communication carrier；Distribution type fiber-optic demodulated equipment (7) is surveyed using based on Brillouin scattering
The measurement of amount technology progress distributing optical fiber sensing；
Step 2: excavating a long groove；
Step 3: being horizontally arranged armouring strain monitoring optical cable (6) along groove, keeps straight non-warping, pass through distribution type fiber-optic solution
Equipment (7) are adjusted to record primary data；
Advance Step 4: bull-dozer is used perpendicular to armouring strain monitoring optical cable (6) cloth set direction, gradually shoveling is big from the distant to the near
It measures above soil to armouring strain monitoring optical cable (6), the number after each earthing is recorded by distribution type fiber-optic demodulated equipment (7)
According to.
7. a kind of answer force calibration method using armouring strain monitoring optical cable described in claim 1, it is characterised in that: rising respectively
Beginning position, middle position, terminal position take specific length, side is fixed on fixed position, and it is single that the other side is fixed on micro- positioning
In member, applied strain is calculated using the strain displacement applied on micro- positioning unit, ε=Δ L/L, ε indicates that is applied answers
Become, Δ L indicates that the elongation of test, L indicate specific length；Frequency strains formula are as follows:
Y=27.888x-1.9843,
Wherein, y indicates strain, and x indicates frequency.
8. answering force calibration method according to claim 7, it is characterised in that: by the calibration of stress, quantitatively obtain it is related because
Number:
1MHz=29 μ ε.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910089268.XA CN109655982A (en) | 2019-01-30 | 2019-01-30 | A kind of armouring strain monitoring optical cable and earthing monitoring and answer force calibration method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910089268.XA CN109655982A (en) | 2019-01-30 | 2019-01-30 | A kind of armouring strain monitoring optical cable and earthing monitoring and answer force calibration method |
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| CN109655982A true CN109655982A (en) | 2019-04-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110984108A (en) * | 2019-11-15 | 2020-04-10 | 河海大学 | Deep horizontal displacement and underground water level integrated monitoring and early warning system and method based on OFDR |
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| JPH07229795A (en) * | 1994-02-22 | 1995-08-29 | Hitachi Cable Ltd | High proof stress optical fiber cable for sensor |
| CN202083822U (en) * | 2011-05-11 | 2011-12-21 | 中国西电集团公司 | Armoured optical cable used for stress monitoring system |
| CN106405762A (en) * | 2016-09-28 | 2017-02-15 | 广西大学 | Smart steel strand capable of distributable measurement |
| US20180073310A1 (en) * | 2015-01-26 | 2018-03-15 | Schlumberger Technology Corporation | Electrically conductive fiber optic slickline for coiled tubing operations |
| CN207396804U (en) * | 2017-08-01 | 2018-05-22 | 东捷光电科技(苏州)有限公司 | A kind of embedded special optical cable of composite building structure |
| CN209281044U (en) * | 2019-01-30 | 2019-08-20 | 南京嘉兆仪器设备有限公司 | A kind of armouring strain monitoring optical cable |
-
2019
- 2019-01-30 CN CN201910089268.XA patent/CN109655982A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07229795A (en) * | 1994-02-22 | 1995-08-29 | Hitachi Cable Ltd | High proof stress optical fiber cable for sensor |
| CN202083822U (en) * | 2011-05-11 | 2011-12-21 | 中国西电集团公司 | Armoured optical cable used for stress monitoring system |
| US20180073310A1 (en) * | 2015-01-26 | 2018-03-15 | Schlumberger Technology Corporation | Electrically conductive fiber optic slickline for coiled tubing operations |
| CN106405762A (en) * | 2016-09-28 | 2017-02-15 | 广西大学 | Smart steel strand capable of distributable measurement |
| CN207396804U (en) * | 2017-08-01 | 2018-05-22 | 东捷光电科技(苏州)有限公司 | A kind of embedded special optical cable of composite building structure |
| CN209281044U (en) * | 2019-01-30 | 2019-08-20 | 南京嘉兆仪器设备有限公司 | A kind of armouring strain monitoring optical cable |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110984108A (en) * | 2019-11-15 | 2020-04-10 | 河海大学 | Deep horizontal displacement and underground water level integrated monitoring and early warning system and method based on OFDR |
| CN110984108B (en) * | 2019-11-15 | 2021-07-09 | 河海大学 | Deep horizontal displacement and underground water level integrated monitoring and early warning system and method based on OFDR |
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