CN108759780A - A kind of FBG monitoring device of high ferro bridge pier sedimentation - Google Patents
A kind of FBG monitoring device of high ferro bridge pier sedimentation Download PDFInfo
- Publication number
- CN108759780A CN108759780A CN201811020685.0A CN201811020685A CN108759780A CN 108759780 A CN108759780 A CN 108759780A CN 201811020685 A CN201811020685 A CN 201811020685A CN 108759780 A CN108759780 A CN 108759780A
- Authority
- CN
- China
- Prior art keywords
- bridge pier
- fiber grating
- optical fiber
- reference stake
- cylindrical projection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004062 sedimentation Methods 0.000 title claims abstract description 20
- 238000012806 monitoring device Methods 0.000 title claims abstract description 14
- 239000000835 fiber Substances 0.000 claims abstract description 80
- 239000013307 optical fiber Substances 0.000 claims abstract description 55
- 239000000853 adhesive Substances 0.000 claims description 14
- 230000001070 adhesive effect Effects 0.000 claims description 14
- 238000004804 winding Methods 0.000 claims description 13
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 208000025274 Lightning injury Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Optical Transform (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a kind of FBG monitoring devices of high ferro bridge pier sedimentation, the device includes the body of a bridge, bridge pier, reference stake and three fiber gratings, after two of which fiber grating is stretched, the optical fiber at both ends is separately fixed in the cylindrical projection on reference stake and bridge pier, the deformation strain come for perceiving bridge pier subsiding belt；Another fiber grating is freely suspended in the cylindrical projection on bridge pier, and temperature-compensating is provided for other two strain measurement gratings；When sedimentation deformation occurs for bridge pier, the fiber grating tension of two pre-stretchings generates variation, and wavelength drifts about.The present invention measures bridge pier sedimentation and deformation using fiber grating as sensing element, and not by field electromagnetic interference influence, remote transmission signal that can be up to a hundred kilometers can realize that distribution is real-time and monitor.
Description
Technical field
The invention belongs to Geotechnical Monitorings and technical field of optical fiber sensing, and in particular to a kind of high ferro bridge pier sedimentation
FBG monitoring device.
Background technology
High-speed railway is swift and violent in China's development, and more and more high ferro circuits interconnect China various regions.But meanwhile I
State's geological structure is complicated, and for the high ferro circuit under the conditions of the severe geology such as loess plateau, Qinghai-Tibet Platean, bridge pier easily occurs
Settlement issues, if sedimentation is more than safety margins, high ferro operational safety will be by great threat, therefore, and high ferro bridge pier sinks
Drop monitoring is particularly important.
Existing bridge pier settlement monitoring mostly uses the technological means such as GPS, laser imaging, optical interdferometer, they are often deposited
Instrumentation it is complicated, it is inconvenient for use, be unfavorable for carrying out real-time monitoring the problems such as.As application No. is " 201410013970.5 "
Chinese invention patent, disclose it is a kind of be imaged based on collimation laser bridge pier sedimentation on-line monitoring and early warning system, by base
Laser is installed, lasing fluorescence is directed toward next bridge pier successively, after then carrying out image procossing to light, obtains opposite on quasi- bridge pier
Settling amount.The technique device is made of multiple instruments, and system constitutes complexity, and high ferro bridge pier is often positioned in wild environment, exists
The complex jammings such as lightning stroke, there are problems for the applicability of the technique device.
Invention content
Existing high ferro bridge pier monitoring technology, which is primarily present, to be monitored in the presence of a harsh environment, be unfavorable for monitoring etc. in real time asks
Topic, for these problems, the present invention provides a kind of FBG monitoring devices of high ferro bridge pier sedimentation, are made using fiber grating
Bridge pier sedimentation and deformation is measured for sensing element, not by field electromagnetic interference influence, remote transmission signal that can be up to a hundred kilometers, energy
It is enough to realize distributed monitoring in real time.
For this purpose, present invention employs following technical schemes：
A kind of FBG monitoring device of high ferro bridge pier sedimentation, including the body of a bridge, bridge pier, the first reference stake, the first optical fiber
Grating, the second fiber grating, third fiber grating and the second reference stake；First reference stake and the second reference stake are located at
Centre position between respective body of a bridge following two bridge pier, and it is fixed on ground；First reference stake and the second reference stake are located at
The left and right sides of bridge pier；The left side optical fiber of first fiber grating is fixed on the side of the first reference stake, and right side optical fiber is solid
It is scheduled in the same side of intermediate bridge pier；Second fiber grating is freely suspended in the same side of intermediate bridge pier；It is described
The left side optical fiber of third fiber grating is fixed on position identical with the right side optical fiber of the first fiber grating, right side on intermediate bridge pier
Optical fiber is fixed in the same side of the second reference stake；The right side optical fiber of first fiber grating, the left side light of third fiber grating
It is fine to connect respectively with after the welding of the tail optical fiber at the second fiber grating both ends.
Preferably, the side upper end of the bridge pier is equipped with bridge pier cylindrical projection；The side upper end of first reference stake is set
There are the first reference stake cylindrical projection, the side upper end of second reference stake to be equipped with the second reference stake cylindrical projection；All circles
Column protrusion is respectively positioned on identical side, and the height of bridge pier cylindrical projection is higher than another two cylindrical projection, and the first reference stake cylinder is convex
The height of the height and the second reference stake cylindrical projection that rise is equal.
Preferably, the left side Optical Fiber Winding of first fiber grating and the first reference stake cylinder is fixed on using adhesive
In protrusion, after stretched, right side Optical Fiber Winding is simultaneously fixed on using adhesive in bridge pier cylindrical projection；The second optical fiber light
Grid are freely suspended in bridge pier cylindrical projection；The left side Optical Fiber Winding of the third fiber grating is simultaneously fixed on bridge using adhesive
In pier cylindrical projection, after stretched, right side Optical Fiber Winding is simultaneously fixed on using adhesive in the second reference stake cylindrical projection.
Preferably, first reference stake and the second reference stake it is buried enter ground fix.
Preferably, the tail optical fiber of the tail optical fiber of the first fiber grating left side one end and third fiber grating right side one end, point
Do not continue to concatenate with next bridge pier monitoring fiber grating.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) use fiber grating as sensing element measurement bridge pier sedimentation and deformation, not by field electromagnetic interference influence, can on
Hundred kilometers of remote transmission signal, and dozens of grating measuring point can be concatenated on an optical fiber, it may be implemented distributed real-time
Monitoring.
(2) in implementation process, it only need to be embedded to reference stake, fiber grating can carry out measurement after being fastened, easy to operate.
(3) simple in structure, it is easy to use, adapt to the real-time monitoring under adverse circumstances.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of the FBG monitoring device of high ferro bridge pier sedimentation provided by the present invention.
Reference sign：1, the body of a bridge；2, bridge pier；3, the first reference stake；4, the first fiber grating；5, the second optical fiber light
Grid；6, third fiber grating；7, the second reference stake；2-1, bridge pier cylindrical projection；3-1, the first reference stake cylindrical projection；7-1,
Two reference stake cylindrical projections.
Specific implementation mode
Below in conjunction with the accompanying drawings and specific embodiment come the present invention will be described in detail, specific embodiment therein and explanation only
For explaining the present invention, but it is not as a limitation of the invention.
As shown in Figure 1, the invention discloses a kind of FBG monitoring device of high ferro bridge pier sedimentation, including the body of a bridge 1, bridge
Pier 2, the first reference stake 3, the first fiber grating 4, the second fiber grating 5, third fiber grating 6 and the second reference stake 7；Described
One reference stake 3 and the second reference stake 7 are located at the centre position between 1 following two bridge pier 2 of the respective body of a bridge, and are fixed on ground
Face；First reference stake 3 and the second reference stake 7 are located at the left and right sides of bridge pier 2；The left side light of first fiber grating 4
Fibre is fixed on the side of the first reference stake 3, and right side optical fiber is fixed in the same side of intermediate bridge pier 2；Second optical fiber
Grating 5 is freely suspended in the same side of intermediate bridge pier 2；The left side optical fiber of the third fiber grating 6 is fixed on intermediate axle
Position identical with the right side optical fiber of the first fiber grating 4, right side optical fiber are fixed on the same side of the second reference stake 7 on pier 2
On；The right side optical fiber of first fiber grating 4, the left side optical fiber of third fiber grating 6 tail with 5 both ends of the second fiber grating respectively
It connects after fibre welding.
Specifically, the side upper end of the bridge pier 2 is equipped with bridge pier cylindrical projection 2-1；On the side of first reference stake 3
End is equipped with the first reference stake cylindrical projection 3-1, and the side upper end of second reference stake 7 is equipped with the second reference stake cylindrical projection 7-
1；All cylindrical projections are respectively positioned on identical side, and the height of bridge pier cylindrical projection 2-1 is higher than another two cylindrical projection, and first
The height of reference stake cylindrical projection 3-1 and the height of the second reference stake cylindrical projection 7-1 are equal.
Specifically, the left side Optical Fiber Winding of first fiber grating 4 and use adhesive are fixed on the first reference stake and justify
On column protrusion 3-1, after stretched, right side Optical Fiber Winding is simultaneously fixed on using adhesive on bridge pier cylindrical projection 2-1；Described
Two fiber gratings 5 are freely suspended on bridge pier cylindrical projection 2-1；The left side Optical Fiber Winding of the third fiber grating 6 simultaneously uses
Adhesive is fixed on bridge pier cylindrical projection 2-1, and after stretched, right side Optical Fiber Winding is simultaneously fixed on the second base using adhesive
On quasi- stake cylindrical projection 7-1.
Specifically, first reference stake, 3 and second reference stake 7 it is buried enter ground fix.
Specifically, the tail optical fiber of 6 right side one end of the tail optical fiber of first fiber grating, 4 left side one end and third fiber grating,
Continue to concatenate with next bridge pier monitoring fiber grating respectively.
Embodiment
A kind of manufacturing process of the FBG monitoring device of high ferro bridge pier sedimentation is as follows：
First, the ground in the centre position between the bridge pier 2 of left, center, right three, makes a call to 2 deep holes, is embedded to 2 bases vertically
Quasi- stake, i.e. the first reference stake 3 and the second reference stake 7 will not be settled since the upper end of reference stake does not stress without weight, institute
Can be used as datum mark；
Secondly, it is fixed respectively by cement or adhesive in the upper end of bridge pier 2, the first reference stake 3 and the second reference stake 7
One cylindrical projection, for winding and fixing optical fiber；
Finally, the tail of the first fiber grating 4 is wound on the first reference stake cylindrical projection 3-1 above the first reference stake 3
Fibre, and fixed using adhesive, the first fiber grating 4 is then stretched, wave length shift 2nm is made, then winds other end tail optical fiber
And it is fixed on the cylindrical projection 2-1 of intermediate bridge pier 2；Third fiber grating 6 is fixed using similar method；Second fiber grating
5 are freely suspended on the cylindrical projection 2-1 of intermediate bridge pier 2, then use optical fiber bonding machine by the first fiber grating 4, third light
The tail optical fiber of fine grating 6 and the second fiber grating 5 on intermediate bridge pier 2 welds.
6 other end of tail optical fiber of first fiber grating 4 and third fiber grating can monitor optical fiber light with next bridge pier
Grid continue to concatenate.
Bridge pier Monitoring method of the subsidence is as follows：When sedimentation deformation occurs for bridge pier 2, the first fiber grating 4 of two pre-stretchings
Variation is generated with the tension of third fiber grating 6, wavelength drifts about.Meanwhile variation of ambient temperature can make the first fiber grating
4, there is in the same direction, equivalent wave length shift in the second fiber grating 5 and third fiber grating 6, using optical fiber raster wavelength demodulator
Monitor the wave length shift situation of all fiber gratings.The drift value of first fiber grating 4, third fiber grating 6 is subtracted second
The wavelength shift of fiber grating 5 rejects the wavelength drift of the first fiber grating 4 caused by environment temperature, third fiber grating 6
Move, you can obtain by bridge pier subsiding belt Lai the first fiber grating 4,6 wavelength shift of third fiber grating, and then corresponded to
Strain value；In conjunction between bridge pier cylindrical projection 2-1 and the first reference stake cylindrical projection 3-1, the second reference stake cylindrical projection 7-1
Two fiber lengths, you can obtain the length varying value of this section of optical fiber；In conjunction with a bridge pier cylindrical projection 2-1 and the first base
The isosceles triangle that quasi- stake cylindrical projection 3-1, the second reference stake cylindrical projection 7-1 are constituted carries out calculating solution, since obtaining
The length varying value (i.e. the length varying value of optical fiber) of two waist edges of isosceles triangle, then according to the geometric properties of triangle and
Trigonometric function relationship push away isosceles triangle height change (i.e. bridge pier settle) situation.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to restrict the invention, all essences in the present invention
Any modification, equivalent replacement and improvement etc., should be included in protection scope of the present invention made by within refreshing and spirit
Within.
Claims (5)
1. a kind of FBG monitoring device of high ferro bridge pier sedimentation, including the body of a bridge (1), bridge pier (2), the first reference stake (3), the
One fiber grating (4), the second fiber grating (5), third fiber grating (6) and the second reference stake (7), it is characterised in that：It is described
First reference stake (3) and the second reference stake (7) are located at the centre position between the respective body of a bridge (1) following two bridge pier (2), and
It is fixed on ground；First reference stake (3) and the second reference stake (7) are located at the left and right sides of bridge pier (2)；First optical fiber
The left side optical fiber of grating (4) is fixed on the side of the first reference stake (3), and right side optical fiber is fixed on the identical of intermediate bridge pier (2)
On side；Second fiber grating (5) is freely suspended in the same side of intermediate bridge pier (2)；The third fiber grating
(6) left side optical fiber is fixed on position identical with the right side optical fiber of the first fiber grating (4), right side light on intermediate bridge pier (2)
Fibre is fixed in the same side of the second reference stake (7)；The right side optical fiber of first fiber grating (4), third fiber grating (6)
Left side optical fiber is connected after being welded respectively with the tail optical fiber at the second fiber grating (5) both ends.
2. a kind of FBG monitoring device of high ferro bridge pier sedimentation according to claim 1, it is characterised in that：The bridge
The side upper end of pier (2) is equipped with bridge pier cylindrical projection (2-1)；The side upper end of first reference stake (3) is equipped with the first benchmark
The side upper end of stake cylindrical projection (3-1), second reference stake (7) is equipped with the second reference stake cylindrical projection (7-1)；All
Cylindrical projection is respectively positioned on identical side, and the height of bridge pier cylindrical projection (2-1) is higher than another two cylindrical projection, the first reference stake
The height of the height of cylindrical projection (3-1) and the second reference stake cylindrical projection (7-1) is equal.
3. a kind of FBG monitoring device of high ferro bridge pier sedimentation according to claim 2, it is characterised in that：Described
The left side Optical Fiber Winding of one fiber grating (4) is simultaneously fixed on using adhesive in the first reference stake cylindrical projection (3-1), by drawing
After stretching, right side Optical Fiber Winding is simultaneously fixed on using adhesive in bridge pier cylindrical projection (2-1)；Second fiber grating (5) is certainly
By being suspended in bridge pier cylindrical projection (2-1)；The left side Optical Fiber Winding of the third fiber grating (6) is simultaneously fixed using adhesive
In bridge pier cylindrical projection (2-1), after stretched, right side Optical Fiber Winding is simultaneously fixed on the second reference stake cylinder using adhesive
On raised (7-1).
4. wanting the FBG monitoring device that a kind of high ferro bridge pier described in any one of 1 to 3 settles, feature to exist according to right
In：First reference stake (3) and the second reference stake (7) it is buried enter ground fix.
5. a kind of FBG monitoring device of high ferro bridge pier sedimentation according to claim 4, it is characterised in that：Described
The tail optical fiber of tail optical fiber and third fiber grating (6) right side one end of one end, is supervised with next bridge pier respectively on the left of one fiber grating (4)
Fiber grating is surveyed to continue to concatenate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811020685.0A CN108759780B (en) | 2018-09-03 | 2018-09-03 | Fiber bragg grating monitoring device for high-speed railway pier settlement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811020685.0A CN108759780B (en) | 2018-09-03 | 2018-09-03 | Fiber bragg grating monitoring device for high-speed railway pier settlement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108759780A true CN108759780A (en) | 2018-11-06 |
| CN108759780B CN108759780B (en) | 2024-02-20 |
Family
ID=63968033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811020685.0A Active CN108759780B (en) | 2018-09-03 | 2018-09-03 | Fiber bragg grating monitoring device for high-speed railway pier settlement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108759780B (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090058230A (en) * | 2007-12-04 | 2009-06-09 | 주식회사 이제이텍 | System and method of measuring ground movement |
| CN102323578A (en) * | 2011-06-01 | 2012-01-18 | 重庆大学 | Microwave distance measurement-based three-dimensional displacement monitoring device and method |
| CN102628718A (en) * | 2011-02-01 | 2012-08-08 | 阿尔斯通技术有限公司 | Arrangement and method for measuring the deformation of a shaft |
| KR101344722B1 (en) * | 2012-10-22 | 2013-12-26 | (주)카이센 | System for measuring bridge deflection using optical fiber |
| US20150316426A1 (en) * | 2012-12-13 | 2015-11-05 | Universität Wien | Method for Measuring a Moving Vehicle |
| CN204924231U (en) * | 2015-07-29 | 2015-12-30 | 轻工业环境保护研究所 | Topsoil settlement monitoring device |
| CN107228653A (en) * | 2017-06-30 | 2017-10-03 | 中铁十四局集团有限公司 | Tunnel mechanism for monitoring and the Monitoring method of the subsidence for tunnel |
| CN107328370A (en) * | 2017-06-23 | 2017-11-07 | 中国科学院武汉岩土力学研究所 | The fiber grating aperture deformation-sensor of long-term measurement surrouding rock stress |
| CN206772282U (en) * | 2017-06-12 | 2017-12-19 | 中国三峡新能源有限公司 | Offshore wind power foundation absolute settlement monitoring device |
| CN108387213A (en) * | 2018-03-30 | 2018-08-10 | 胡仲春 | Bridge pier monitoring method |
| CN208588349U (en) * | 2018-09-03 | 2019-03-08 | 刘绍波 | A kind of FBG monitoring device of high-speed rail bridge pier sedimentation |
-
2018
- 2018-09-03 CN CN201811020685.0A patent/CN108759780B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090058230A (en) * | 2007-12-04 | 2009-06-09 | 주식회사 이제이텍 | System and method of measuring ground movement |
| CN102628718A (en) * | 2011-02-01 | 2012-08-08 | 阿尔斯通技术有限公司 | Arrangement and method for measuring the deformation of a shaft |
| CN102323578A (en) * | 2011-06-01 | 2012-01-18 | 重庆大学 | Microwave distance measurement-based three-dimensional displacement monitoring device and method |
| KR101344722B1 (en) * | 2012-10-22 | 2013-12-26 | (주)카이센 | System for measuring bridge deflection using optical fiber |
| US20150316426A1 (en) * | 2012-12-13 | 2015-11-05 | Universität Wien | Method for Measuring a Moving Vehicle |
| CN204924231U (en) * | 2015-07-29 | 2015-12-30 | 轻工业环境保护研究所 | Topsoil settlement monitoring device |
| CN206772282U (en) * | 2017-06-12 | 2017-12-19 | 中国三峡新能源有限公司 | Offshore wind power foundation absolute settlement monitoring device |
| CN107328370A (en) * | 2017-06-23 | 2017-11-07 | 中国科学院武汉岩土力学研究所 | The fiber grating aperture deformation-sensor of long-term measurement surrouding rock stress |
| CN107228653A (en) * | 2017-06-30 | 2017-10-03 | 中铁十四局集团有限公司 | Tunnel mechanism for monitoring and the Monitoring method of the subsidence for tunnel |
| CN108387213A (en) * | 2018-03-30 | 2018-08-10 | 胡仲春 | Bridge pier monitoring method |
| CN208588349U (en) * | 2018-09-03 | 2019-03-08 | 刘绍波 | A kind of FBG monitoring device of high-speed rail bridge pier sedimentation |
Non-Patent Citations (1)
| Title |
|---|
| 王旭: "长大干线高速铁路自动化沉降监测系统研究", 《高速铁路技术》, vol. 8, no. 6, pages 68 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108759780B (en) | 2024-02-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106680535B (en) | The differential-type optical accelerometer of laser beat frequency is realized based on Fiber Bragg Grating Reflective Spectrum Characteristics | |
| CN207050903U (en) | Force measuring device in a kind of drag-line based on cable body strain | |
| CN102410886A (en) | Fiber temperature sensor and measuring system thereof and signal processing method of system | |
| Nan et al. | Real-time monitoring of wind-induced vibration of high-voltage transmission tower using an optical fiber sensing system | |
| CN103266917A (en) | Roof bed separation monitoring system based on fiber grating | |
| CN107702689A (en) | The monitoring system and monitoring method of a kind of surface subsidence monitoring | |
| CN104627205A (en) | Railway foreign matter beyond limit monitoring system based on fiber bragg grating sensor closed loop | |
| Rodriguez-Cobo et al. | Speckle characterization in multimode fibers for sensing applications | |
| CN208588349U (en) | A kind of FBG monitoring device of high-speed rail bridge pier sedimentation | |
| CN110285769A (en) | A kind of scale expansion device for distributive fiber optic strain sensing | |
| CN204368189U (en) | Based on the railway foreign body intrusion monitoring system of fiber-optic grating sensor closed loop | |
| Liu et al. | Submarine optical fiber sensing system for the real-time monitoring of depth, vibration, and temperature | |
| Guo et al. | Temperature-insensitive fiber Bragg grating force sensor via a bandwidth modulation and optical-power detection technique | |
| CN108759780A (en) | A kind of FBG monitoring device of high ferro bridge pier sedimentation | |
| CN104614093B (en) | Bending-insensitive distributed Brillouin optical fiber temperature and strain sensor | |
| Wo et al. | Biconical-taper-assisted fiber interferometer with modes coupling enhancement for high-sensitive curvature measurement | |
| CN106546187A (en) | A kind of LPFG curvature sensor and its detection method | |
| CN110132137A (en) | A kind of large-scale suspension bridge steel box-girder overall length Displacements Distribution measurement method based on distributed optical fiber sensing | |
| CN206847755U (en) | A kind of vehicle dynamic weighing system | |
| CN214039913U (en) | Deformation self-detection and alarm system for highway guardrail | |
| CN109683112A (en) | A kind of magnetic field sensor of magnetic fluid coating side throwing optical fiber and its preparation and detection method | |
| CN103868673A (en) | Optical fiber Raman scattering effect-based optical cable identification and positioning method and equipment | |
| CN207050906U (en) | Force measuring device in a kind of drag-line based on anchor head strain | |
| CN205404455U (en) | System for utilize FBG to measure liquid level | |
| CN205580560U (en) | Utilize FBG cluster to measure device of liquid level |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |