CN107655450A - A kind of high precision optical fiber grating dislocation meter - Google Patents
A kind of high precision optical fiber grating dislocation meter Download PDFInfo
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- CN107655450A CN107655450A CN201710990970.4A CN201710990970A CN107655450A CN 107655450 A CN107655450 A CN 107655450A CN 201710990970 A CN201710990970 A CN 201710990970A CN 107655450 A CN107655450 A CN 107655450A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 35
- 239000000835 fiber Substances 0.000 claims abstract description 31
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 29
- 239000010935 stainless steel Substances 0.000 claims abstract description 25
- 125000006850 spacer group Chemical group 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 12
- 230000003287 optical effect Effects 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 abstract description 4
- 230000008859 change Effects 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract description 2
- 230000007774 longterm Effects 0.000 abstract description 2
- 238000004062 sedimentation Methods 0.000 abstract 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 230000005611 electricity Effects 0.000 description 1
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- 230000036541 health Effects 0.000 description 1
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- 239000000203 mixture Substances 0.000 description 1
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- 238000012827 research and development Methods 0.000 description 1
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- 238000003466 welding Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35306—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement
- G01D5/35309—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer
- G01D5/35316—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using an interferometer arrangement using multiple waves interferometer using a Bragg gratings
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a kind of high precision optical fiber grating dislocation meter, including fiber grating, optical fiber loose tube, extension spring, sliding bar, spacer, sheath, accurate stainless steel tube, drive link and fastener.This dislocation meter uses tubular type cascaded structure, in accurate stainless steel tube, has disposed sliding bar, extension spring, spacer, fiber grating and sheath successively.The sensor mechanism of dislocation meter is that the differential settlement amount of subsiding crack both sides is converted into elastic force by spring, act in bare optical fibers and bare optical gratings, making bare optical fibers and bare optical gratings, itself produces strain by axial stress, and then cause the centre wavelength of grating fibers to change, realize the monitoring of relative settlement amount.The dislocation meter of the present invention can carry out long-term monitoring in real time to building and structure sedimentation seam both sides differential settlement, and its measurement accuracy is high, simple in construction, stability is good, high sensitivity, electromagnetism interference, cheap, has good economic benefit and social benefit.
Description
Technical field
The present invention is based on Fiber Bragg Grating technology, is a kind of real to the progress of underground pipe gallery subsiding crack structure on two sides relative settlement amount
When the high precision optical fiber grating dislocation meter that monitors, belong to technical field of optical fiber sensing.
Background technology
In recent years, the important component as Urban Underground Space Sustainable Development, by City Buried Pipeline, such as electricity
Underground pipe gallery hair of the concentrated settings such as power, communication, combustion gas, feedwater, draining, heating power, television network network in same tunnel space
Exhibition is rapid.It has the advantages of up-to-dateness is high, intensive level is high, is easy to Cooperative Maintenance to manage concentratedly.But due to its knot
Structure longitudinal direction section is longer, inevitably results from local differential settlement, causes line break to form fire or even blast etc.
Disaster.On the other hand, the local differential settlement information for timely and accurately obtaining underground pipe gallery is highly important.By to buried pipe
The real-time monitoring of corridor subsiding crack both sides relative settlement amount, it is possible to achieve excavation of foundation pit speed and drop during the exploitation of control surrounding area
Water speed, to transfiniting, position gives warning in advance, and avoids causing piping lane internal pipeline to destroy, prevents accident.Fiber grating is because with spirit
Sensitivity height, electromagnetism interference, it is corrosion-resistant the features such as, suitable for the Long Period Health Monitoring of underground complex engineering.Therefore, research and development are a kind of
The high precision optical fiber grating dislocation meter of the long-term both sides of monitoring underground pipe gallery subsiding crack in real time relative settlement state is necessary.
The content of the invention
Meet that underground pipe gallery monitors in real time for a long time with dam the present invention relates to one kind, stable performance, reliable, high sensitivity,
Electromagnetism interference, available for monitoring underground pipe gallery and the fiber grating position of dam body subsiding crack structure on two sides relative settlement state
Mistake meter.
To achieve these goals, the technical scheme of present invention solution technical problem is：
A kind of high precision optical fiber grating dislocation meter, including：It is fiber grating, optical fiber loose tube, extension spring, sliding bar, fixed
Bit slice, sheath, stainless steel tube, drive link；Agent structure uses tubular type cascaded structure, and left side is provided with slip in stainless steel tube
Bar；Sliding bar front end is placed on the outside of stainless steel tube, and rear end is connected by stainless steel ring with extension spring front end, extension spring rear end
It is connected with spacer；Spacer is Nian Jie with the tail optical fiber of fiber grating front end, and sheath is arranged with outside the tail optical fiber of fiber grating rear end, protects
Set outer wall abuts with stainless steel inside pipe wall；Sliding bar front end is fixed on wall by yi word pattern fastener；Outside stainless steel tube waist
Side is connected by fixed T-shaped fastener with drive link front end, and transmission rod rear end is fixed on wall by yi word pattern fastener；Optical fiber
Grating is Bragg gratings.
Extension spring, sliding bar, the material of drive link and spacer are 304 stainless steels.
The present invention has following advantages and effect：
1. monitoring accuracy is high, influence of the encapsulation error to sensor is small.The present invention is stressed directly using bare optical fibers and bare optical gratings, from
Body produces strain, and then causes the mode that changes of centre wavelength to realize the monitoring of displacement, does not paste fiber grating
On matrix.So the deformability of fiber grating itself is taken full advantage of, improves monitoring sensitivity.In addition, the party
Formula avoids in taping process and causes initial deformation to fiber grating, has been remarkably improved the monitoring accuracy of sensor.
2. measurement accuracy can be adjusted.
Relative displacement is changed into by elastic force using extension spring due to of the invention, is applied in bare optical fibers and bare optical gratings, and then make
Axial deformation occurs for fiber grating, gets center wavelength variation signal.On the other hand, the rigidity of spring directly affects raster center
The variable quantity of wavelength.By choosing the spring of different-stiffness, it can flexibly change measurement accuracy.
3. stability is good, low manufacture cost.The packing component material of the present invention is 304 stainless steels and PVC compounds, cost
It is cheap, make simply, stability is good, has good resistance to corrosion, fiber grating can be played a good protection.
4. it is exquisite compact, it is applied widely；By transforming fixed form, each class formation and different rings are adapted to
Relative settlement amount monitors under border.This fiber grating dislocation meter is simple in construction, measurement accuracy is high, stability is good, it is easy to process manufacture,
It is high sensitivity, electromagnetism interference, anticorrosive, there is preferable applicability and expansion.
Brief description of the drawings
Fig. 1 is the positive view of the present invention.
Fig. 2 is the graphics sectional view of the present invention.
Fig. 3 is the fiber grating partial enlargement of the present invention.
Fig. 4 is the product mix figure of the present invention.
Embodiment
With reference to specific embodiment, the present invention will be described in further detail, but protection scope of the present invention is not had
The embodiment of body is limited, and is defined by claims.In addition, with without prejudice on the premise of technical solution of the present invention, to this hair
Any modifications or changes that bright made those of ordinary skill in the art easily realize fall within the claim model of the present invention
Within enclosing.
Fig. 1, a kind of high precision optical fiber grating dislocation meter of the invention shown in 2,3,4, including：Fiber grating, optical fiber pine set
Pipe, extension spring, sliding bar, spacer, PVC sheath, 304 accurate stainless steel tubes, drive link；
Agent structure uses tubular type cascaded structure, and left side is provided with sliding bar 1 in stainless steel tube 8, and the front end of sliding bar 1 is put
In the outside of stainless steel tube 8, rear end is connected by stainless steel ring with the front end of extension spring 2, and the rear end of extension spring 2 connects with spacer 3
Connect；Spacer 3 is be bonded with the tail optical fiber 4 of the front end of fiber grating 5, and sheath 6, sheath 6 are arranged with outside the tail optical fiber 4 of the rear end of fiber grating 5
Outer wall abuts with the inwall of stainless steel tube 8；The front end of sliding bar 1 is fixed on wall by yi word pattern fastener 10；
It is connected on the outside of the waist of stainless steel tube 8 by fixed T-shaped fastener 11 with the front end of drive link 9, the rear end of drive link 9 passes through
Yi word pattern fastener 10 is fixed on wall；Fiber grating is Bragg gratings.
Extension spring, sliding bar, the material of drive link and spacer are 304 stainless steels.
A kind of high precision optical fiber grating dislocation meter of monitoring underground pipe gallery subsiding crack both sides relative settlement amount of the present invention
Operation principle is as follows：
When relative displacement Δ x occurs for sliding bar, elastic force caused by spring elongation is N, axial force suffered by bare optical fibers and bare optical gratings
Value be also N, strain be ε caused by fiber grating, and its relation knowable to mechanics of materials general principle meets equation：
N=ka·Δx (1)
σ=E ε (3)
Wherein kaFor the rigidity of extension spring；σ is the axial stress of bare optical fibers and bare optical gratings；R is the radius for fiber grating；E
For the modulus of elasticity of fiber optic materials.
It can be obtained by (1) (2) (3)
From fiber grating principle, if not considering center wavelength variation caused by temperature, FBG operation principle expression formulas are
Wherein：Kε=1-Pe.It can be obtained by formula (4) and (5)
And then obtain
Formula (6) is the theoretical formula of dislocation meter, and thus formula can be seen that relative settlement amount Δ x and raster center wavelength shift
Measure Δ λBBetween it is linear, pass through monitoring center changed wavelength Δ λBSo as to obtain relative settlement amount Δ x result.
A kind of dislocation meter of real-time monitoring underground pipe gallery relative settlement amount based on grating fibers technology of the present invention is having
When body encapsulates：
The left and right tail optical fiber of fiber grating is handled, side tail optical fiber leaves 1.5cm, and side tail optical fiber leaves 30cm and put
25cm optical fiber loose tube, a small amount of 704 glue need to be smeared on tail optical fiber during sleeve pipe, is not dealt with grid region.
Scolding tin is melted in sliding bar both ends with flatiron, stainless steel ring in welding.Fine copper wire is fastened in side, and opposite side hangs up drawing
Spring is stretched, the opposite side of extension spring is hooked on the circular hole of spacer.The short-tail fibre of fiber grating passes through cyanacrylate
It is bonded on the symmetry axis of spacer, long tail optical fiber pierces into PVC sheath.When assembled, sliding bar is filled in into 304 accurate stainless steel tubes
In, leading-out copper wire is light to draw copper cash that all parts of series connection are introduced into 304 accurate stainless steel tubes, and the half of PVC sheath is filled in
304 accurate stainless steel tubes, the EVA heat-shrink tubes on the set of one end of PVC sheath, heating tighten carry out port protection.Copper cash is taken off, is gone
Fall the exposed stainless steel ring of sliding bar, complete encapsulation.
Claims (3)
- A kind of 1. high precision optical fiber grating dislocation meter, it is characterised in that：Including：Fiber grating, optical fiber loose tube, extension spring, Sliding bar, spacer, sheath, stainless steel tube, drive link；Agent structure uses tubular type cascaded structure, and left side is provided with sliding bar (1) in stainless steel tube (8)；Sliding bar (1) front end is placed on the outside of stainless steel tube (8), and rear end is connected by stainless steel ring with extension spring (2) front end, is drawn Spring (2) rear end is stretched to be connected with spacer (3)；Spacer (3) is Nian Jie with the tail optical fiber (4) of fiber grating (5) front end, is arranged with outside the tail optical fiber (4) of fiber grating (5) rear end Sheath (6), sheath (6) outer wall abut with stainless steel tube (8) inwall；Sliding bar (1) front end is fixed on wall by yi word pattern fastener (10)；It is connected on the outside of stainless steel tube (8) waist by fixed T-shaped fastener (11) with drive link (9) front end, drive link (9) rear end It is fixed on by yi word pattern fastener (10) on wall.
- A kind of 2. high precision optical fiber grating dislocation meter according to claim 1, it is characterised in that：Fiber grating is Bragg Grating.
- A kind of 3. high precision optical fiber grating dislocation meter according to claim 1, it is characterised in that：Extension spring, sliding bar, The material of drive link and spacer is 304 stainless steels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710990970.4A CN107655450A (en) | 2017-10-23 | 2017-10-23 | A kind of high precision optical fiber grating dislocation meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710990970.4A CN107655450A (en) | 2017-10-23 | 2017-10-23 | A kind of high precision optical fiber grating dislocation meter |
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| Publication Number | Publication Date |
|---|---|
| CN107655450A true CN107655450A (en) | 2018-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710990970.4A Pending CN107655450A (en) | 2017-10-23 | 2017-10-23 | A kind of high precision optical fiber grating dislocation meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109238223A (en) * | 2018-07-30 | 2019-01-18 | 中铁七局集团西安铁路工程有限公司 | A kind of relative settlement accumulation measurement method and device |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1409085A (en) * | 2001-09-27 | 2003-04-09 | 三丰株式会社 | Integrated linear displacement measuring device, end clamp and fixing method |
| CN101539403A (en) * | 2009-04-22 | 2009-09-23 | 东南大学 | Fiber grating strain and temperature simultaneously measuring sensor |
| CN201444039U (en) * | 2009-07-14 | 2010-04-28 | 山东大学 | Micro fiber grating displacement sensor |
| CN102607422A (en) * | 2011-03-08 | 2012-07-25 | 赵恩国 | Linear fiber bragg grating displacement meter |
| CN204064253U (en) * | 2014-06-23 | 2014-12-31 | 南京南瑞集团公司 | A kind of optical fiber type crack gauge |
| CN205861042U (en) * | 2016-07-26 | 2017-01-04 | 上海电力学院 | A kind of fiber-optic grating sensor based on transformer station's settlement measurement |
| CN106767690A (en) * | 2017-03-06 | 2017-05-31 | 沈阳建筑大学 | A kind of spring fiber grating dislocation meter |
| CN207379488U (en) * | 2017-10-23 | 2018-05-18 | 沈阳建筑大学 | A kind of high precision optical fiber grating dislocation meter |
-
2017
- 2017-10-23 CN CN201710990970.4A patent/CN107655450A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1409085A (en) * | 2001-09-27 | 2003-04-09 | 三丰株式会社 | Integrated linear displacement measuring device, end clamp and fixing method |
| CN101539403A (en) * | 2009-04-22 | 2009-09-23 | 东南大学 | Fiber grating strain and temperature simultaneously measuring sensor |
| CN201444039U (en) * | 2009-07-14 | 2010-04-28 | 山东大学 | Micro fiber grating displacement sensor |
| CN102607422A (en) * | 2011-03-08 | 2012-07-25 | 赵恩国 | Linear fiber bragg grating displacement meter |
| CN204064253U (en) * | 2014-06-23 | 2014-12-31 | 南京南瑞集团公司 | A kind of optical fiber type crack gauge |
| CN205861042U (en) * | 2016-07-26 | 2017-01-04 | 上海电力学院 | A kind of fiber-optic grating sensor based on transformer station's settlement measurement |
| CN106767690A (en) * | 2017-03-06 | 2017-05-31 | 沈阳建筑大学 | A kind of spring fiber grating dislocation meter |
| CN207379488U (en) * | 2017-10-23 | 2018-05-18 | 沈阳建筑大学 | A kind of high precision optical fiber grating dislocation meter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109238223A (en) * | 2018-07-30 | 2019-01-18 | 中铁七局集团西安铁路工程有限公司 | A kind of relative settlement accumulation measurement method and device |
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