CN204479034U - A kind of immersed tube tunnel DEFORMATION MONITORING SYSTEM based on Fibre Optical Sensor - Google Patents
A kind of immersed tube tunnel DEFORMATION MONITORING SYSTEM based on Fibre Optical Sensor Download PDFInfo
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- CN204479034U CN204479034U CN201520050722.8U CN201520050722U CN204479034U CN 204479034 U CN204479034 U CN 204479034U CN 201520050722 U CN201520050722 U CN 201520050722U CN 204479034 U CN204479034 U CN 204479034U
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Abstract
The utility model relates to infrastructure architecture safety and Health monitoring field, specifically a kind of immersed tube tunnel DEFORMATION MONITORING SYSTEM based on Fibre Optical Sensor, comprise fiber-optic grating sensor group, fiber Bragg grating (FBG) demodulator and monitoring host computer, described fiber-optic grating sensor group is connected with Transmission Fibers, the described Transmission Fibers other end is connected to fiber Bragg grating (FBG) demodulator, described fiber Bragg grating (FBG) demodulator is connected to monitoring host computer by wireless remote, described fiber Bragg grating (FBG) demodulator is incident in all fiber-optic grating sensor groups in test section by sending detection light through Transmission Fibers, the reflected light be reflected back by fiber grating is again through fiber Bragg grating (FBG) demodulator demodulation, obtain the wavelength signals of each sensor reflected light, monitoring host computer carries out data transmission by wireless remote data transmission network and fiber Bragg grating (FBG) demodulator, and processes data, to obtain the strain of each monitoring point.
Description
Technical field
The utility model relates to the monitoring of infrastructure architecture safety and Health field, specifically a kind of immersed tube tunnel DEFORMATION MONITORING SYSTEM based on Fibre Optical Sensor.
Background technology
Due in economic and technical particular advantages, the breakthrough of connection and based process especially under water, immersed tube tunnel is more and more subject to the favor of engineering circles.Compared with mining tunnel, have its unique distinction on immersed tube tunnel is stressed, except being subject to cover dead load and cross except car load action, immersed tube tunnel is also subject to the erosion of unrestrained dynamic load and water intermediate ion, and most of immersed tube tunnel is all built in soft clay area, very responsive with distortion to sedimentation.Present stage is a lot of to settlement issues research, to straining the less of research.Tube coupling vertical deformation can only be reflected to the control of sedimentation, can not stressing conditions inside and outside complete reflection tube coupling.Strain is the important physical characteristic parameter of material and structure, can reflect partial structurtes feature, be convenient to safety appraisement of structure and damage reason location.Therefore, during immersed tube tunnel operation, tube segment strain monitoring seems particularly important.
At present, most of immersed tube tunnel sinking deformation monitoring and Gernral Check-up are all completed by spirit-leveling instrument, and the rare monitoring to the strain of immersed tube tunnel section of jurisdiction.The utility model, just based on this present situation, proposes the system of a set of employing optical fiber sensing technology test immersed tube tunnel strain.Its principle makes fiber grating and monitoring point, section of jurisdiction produce synchronous strain, grating space is made to change thus, simultaneously due to the photoelastic effect of fiber grating, the refractive index of fiber grating changes, this can make detect light reflection wavelength comparatively incident wavelength change, the strain at the monitoring point place that can survey thus.The advantages such as the utility model has compact conformation, good stability, highly sensitive, electromagnetism interference, adaptive capacity to environment are strong, utility model can be monitored multibreak of tunnel multi-point simultaneously in addition, is the netted monitoring system of an immersed tube tunnel distortion.
Summary of the invention
The utility model, for the deficiency on existing immersed tube tunnel strain monitoring, provides a kind of immersed tube tunnel DEFORMATION MONITORING SYSTEM based on Fibre Optical Sensor, produces distortion provide high-precision Real-Time Monitoring to immersed tube tunnel construction and later stage operation process.
For reaching above-mentioned purpose, the utility model provides a kind of immersed tube tunnel DEFORMATION MONITORING SYSTEM, comprise fiber-optic grating sensor group, fiber Bragg grating (FBG) demodulator and monitoring host computer, described fiber-optic grating sensor group is connected with Transmission Fibers, the described Transmission Fibers other end is connected to fiber Bragg grating (FBG) demodulator, described fiber Bragg grating (FBG) demodulator is connected to monitoring host computer by wireless remote, each fiber-optic grating sensor group comprises 6 for monitoring fiber Bragg grating strain sensor and 1 fiber-optical grating temperature sensor for temperature correction of each monitoring point strain of immersed tube tunnel section, described fiber Bragg grating strain sensor is installed on section each monitoring point place, the each section of immersed tube tunnel is all provided with a fiber-optical grating temperature sensor, described fiber Bragg grating (FBG) demodulator is incident in all fiber-optic grating sensor groups in test section by sending detection light through Transmission Fibers, and the reflected light be reflected back by fiber grating, again through fiber Bragg grating (FBG) demodulator demodulation, obtains the wavelength signals of each sensor reflected light, monitoring host computer carries out data transmission by wireless remote data transmission network and fiber Bragg grating (FBG) demodulator, and processes data, to obtain the strain of each monitoring point.
Further, immersed tube tunnel DEFORMATION MONITORING SYSTEM carries out Real-Time Monitoring to the multiple section of immersed tube tunnel simultaneously, each section is all provided with one group of fiber-optic grating sensor group, comprise 6 fiber Bragg grating strain sensors and 1 fiber-optical grating temperature sensor, fiber-optic grating sensor group and the welding of branch road Transmission Fibers phase, branch road transfer tube comes together in the total Transmission Fibers in main line, is finally connected to fiber Bragg grating (FBG) demodulator, forms the real-time monitoring system of a set of multibreak multi-point.
Further, sensor inner fiber grating adopts phase mask plate inscription technology to prepare.Fiber grating strain transducer is pasted in sensitive element wire casing obtained through encapsulating again by fiber grating; Fine grating temperature sensor is placed in by fiber grating in the reserved sulculus of sensor box, then fixed by fiber grating in the two ends fixing glue of sulculus, fills the heat-conducting cream do not solidified after two ends are fixed again in sulculus, adds a cover encapsulation and obtain.
Further, each sensor and the welding of branch road Transmission Fibers phase, branch road transfer tube comes together in the total Transmission Fibers in main line, is finally connected to fiber Bragg grating (FBG) demodulator.
Further, fiber Bragg grating (FBG) demodulator comprises:
1) key power switch: the 30 degree of power supplys that turn clockwise after inserting key are connected, and after return, power supply disconnects;
2) power light: system works is often bright;
3) system failure pilot lamp: internal system breaks down often bright;
4) network service pilot lamp: Ethernet communication is flicker;
5) data acquisition pilot lamp: Chang Liang after system energization self-inspection, expression can image data;
6) passage pilot lamp: indicate each passage current working state;
7) the eight external optical-fibre channels in tunnel: interface type is FC/APC, external various grating sensor;
8) Ethernet interface: be connected with radio modem, transmitting code changes wireless signal into and is sent to central database;
9) relay expansion interface: control peripherals;
10) system debug interface: for debugging system;
11) communication serial ports: with other device talk;
12) SIM card socket: change Monitoring Data into transmitting code by SIM card
13) power cord jack: connect external power supply, power to fiber grating demodulation device.
Further, data transmission between fiber Bragg grating (FBG) demodulator and monitoring host computer is with wireless remote data transmission network medium, described wireless remote transmission system comprises the client wireless modulator-demodular unit at field monitoring station, client transmissions program in (FBG) demodulator, central database, user side radio modem, transmission procedure composition in monitoring host computer, the Monitoring Data of each monitoring point by wireless network transmissions to central database, central database carries out pre-service and typing to data message, ensure the accurate and effective of data, user side can conduct interviews to the data in central database after obtaining authority.
Further, the method for testing of described immersed tube tunnel DEFORMATION MONITORING SYSTEM, is characterized in that it comprises the following steps:
1) testing element preparation: fiber grating adopts phase-mask method to be prepared, in preparation process, control well phase mask plate the flute profile degree of depth and account for wide ratio, can effectively suppress the zero order diffracted light of diffraction spectrum and strengthen it ± diffraction efficiency of 1 order diffraction light simultaneously, effectively can improve the making quality of fiber grating;
2) installation of testing tool: selected immersed tube tunnel monitoring section is some, each monitoring section is furnished with several monitoring points, what therefore it was formed is the distributed netted monitoring system of a set of multibreak multi-point, can the strain conditions of Real-Time Monitoring multi-point, thus the overall deformed condition in tunnel can be known by inference;
3) data transmission: what monitoring system adopted is the mode that wireless remote data transmits, the data of monitoring field collection change wireless signal into by radio modem and are sent to central database and are stored, as long as namely user side build-in services device transmission procedure accesses by radio modem the data that in corresponding authority, central database stores after obtaining access rights, the mode of this data transmission, being separated of testing apparatus and monitoring host computer can be realized, reach the object of remote monitoring.
4) data processing: monitoring host computer conducts interviews to the data in central database after obtaining authority, former Plotting data can be become spectrogram, be that some unimodal spectral curves are formed by stacking by Gauss curve fitting by originally discrete data fitting, the wavelength time-histories figure of each fiber-optic grating sensor group reflected light can be obtained thus, the strain time history curve of each monitoring point can be obtained after converting.
The beneficial effects of the utility model are mainly manifested in: the advantages such as the utility model has compact conformation, good stability, highly sensitive, electromagnetism interference, adaptive capacity to environment are strong; During sensor inner fiber preparing grating, optical fiber mask plate adopts the suitable flute profile degree of depth and accounts for wide ratio, effectively can suppress the diffraction efficiency of zeroth-order efficiency and enhancing ± 1 grade, this makes the fiber grating produced have the advantages such as high reflectance, high side mode suppression ratio and narrow bandwidth, and measurement result is also more accurate; Monitoring Data is transmitted by wireless remote data transmission network, has the feature of remote monitoring, greatly facilitates carrying out of monitoring; Monitoring system carries out Real-Time Monitoring to the multibreak face of multi-point in tunnel, and the deformation condition in tunnel in full phase process is runed in sustainable measurement from constructing tunnel to later stage, and monitoring result can be used for the operation maintenance in guiding construction and later stage.
Accompanying drawing explanation
Fig. 1 is the structural representation of the immersed tube tunnel DEFORMATION MONITORING SYSTEM of preferred embodiment.
Fig. 2 is sensor optimal crosssection figure.
Fig. 3 is that phase mask legal system makes fiber grating schematic diagram.
Fig. 4 is fiber Bragg grating strain sensor encapsulating structure figure.
Fig. 5 is fiber-optical grating temperature sensor encapsulating structure figure.
Fig. 6 is fiber Bragg grating (FBG) demodulator front-panel structure schematic diagram.
Fig. 7 is fiber Bragg grating (FBG) demodulator rear panel structure schematic diagram.
Fig. 8 is wireless remote data transmission system structural representation.
Embodiment
By reference to the accompanying drawings the utility model is further described.
According to the utility model preferred embodiment, as shown in Figure 1, immersed tube tunnel DEFORMATION MONITORING SYSTEM comprises: three monitoring sections 1, 2, 3, each monitoring section all has installing optical fibres grating strain transducer and fiber-optical grating temperature sensor, sensor adopts setscrew to be fixed on immersed tube tunnel section of jurisdiction, each sensor connects by branch optical fibers, each branch optical fibers is finally collected to a trunk optical fiber, totally three trunk optical fiber, trunk optical fiber is finally connected to fiber Bragg grating (FBG) demodulator 4 place, fiber Bragg grating (FBG) demodulator 4 is connected with a radio modem 5, the data of collection are sent to central database 6 with the form of wireless signal by radio modem, monitoring host computer 8 accesses the data of corresponding authority in central database 6 after obtaining access rights by another radio modem 7, the data of acquisition are converted parsing by monitoring host computer, the deformation of each section can be obtained.
Fig. 2 is sensor optimal crosssection figure, include 6 fiber Bragg grating strain sensors, 1,2,3,4,5,6 and 1 fiber-optical grating temperature sensors 7, each sensor is evenly distributed on immersed tube tunnel section of jurisdiction, to the temperature correction in addition of each strain transducer data measured, the strain of each monitoring point can be obtained, and then the deformation condition of whole transversal section can be known by inference.
Fig. 3 is that phase mask legal system makes fiber grating schematic diagram, the periodic light and shade striped that phase mask utilizes electron beam ± 1 order diffraction light (3 and 5) to interfere and formed exposes year hydrogen optical fiber and obtains fiber grating 2, this method does not rely on lambda1-wavelength, only relevant with the cycle of phase mask, enormously simplify the manufacturing process of fiber grating 2, reduce the restriction to Writing condition, can mass production be realized.This ratio juris formula is λ
b=2n
effΛ=n
effΛ
pm, λ
bfor bragg wavelength, n
efffor fiber core effective refractive index, Λ is the cycle of fiber grating, Λ
pmfor the cycle of phase mask.The gordian technique of this method is that diffraction light includes some order diffraction spectrum, and makes spectrum needed for fiber grating and be ± 1 grade, and actual 0 grade of spectrum 4 is comparatively strong, therefore needs suppression 0 grade of spectrum to strengthen the diffraction efficiency of ± 1 grade of spectrum.Actual tests proves, the accounting for wide ratio and the flute profile degree of depth and effectively can suppress the diffraction efficiency of 0 grade of spectrum and the diffraction efficiency simultaneously strengthening ± 1 grade of spectrum of conservative control optical fiber mask 1.The optical fiber mask plate that the present invention adopts can suppress the diffraction efficiency of 0 grade of spectrum greatly, and the fiber grating produced has the advantages such as high reflectance, high side mode suppression ratio and narrow bandwidth, and measurement result is accurate.
Fig. 4 is fiber Bragg grating strain sensor encapsulating structure figure, that fiber grating 2 is pasted in the wire casing of sensitive element 1, the another side of sensitive element 1 is pasted onto on monitoring point, there are tension and compression and strain in monitoring point, sensitive element then can drive fiber grating to produce corresponding tension and compression strain, now the refractive index of grating space and optical fiber all changes, the wavelength of reflected light will produce skew more originally, and computing formula is: Δ λ
b=C
c-fλ
b(1-p
c) ε
f, wherein C
c-ffor the stickup coefficient between optical fiber and copper sheet, p
cthe effective strain optical coefficient of optical fiber.Strain stress can be gone out by inverse by this formula
f.
Fig. 5 is fiber-optical grating temperature sensor encapsulating structure figure, that fiber grating 3 is placed in sulculus in sensor box 1, middle filling is not solidified heat-conducting cream 2 and is fixedly made, heat-conducting cream does not solidify, can absorb and cushion extraneous stress, avoid fiber grating to be subject to the impact of extraneous stress, be only subject to the impact of temperature residing for sensor.
Fig. 6 is fiber Bragg grating (FBG) demodulator front-panel structure schematic diagram, comprising:
1) key power switch 1: the 30 degree of power supplys that turn clockwise after inserting key are connected, and after return, power supply disconnects;
2) power light 2: system works is often bright;
3) system failure pilot lamp 3: internal system breaks down often bright;
4) network service pilot lamp 4: Ethernet communication is flicker;
5) data acquisition pilot lamp 5: Chang Liang after system energization self-inspection, expression can image data;
6) passage pilot lamp 6: indicate each passage current working state.
Fig. 7 is fiber Bragg grating (FBG) demodulator rear panel structure schematic diagram, includes:
1) the eight external optical-fibre channels 1 in tunnel: interface type is FC/APC, external various grating sensor;
2) Ethernet interface 2: be connected with radio modem, transmitting code changes wireless signal into and is sent to central database;
3) relay expansion interface 3: control peripherals;
4) system debug interface 4: for debugging system;
5) communication serial ports 5: with other device talk;
6) SIM card socket 6: change Monitoring Data into transmitting code by SIM card
7) power cord jack 7: connect external power supply, power to fiber grating demodulation device.
Fig. 8 is wireless remote data transmission system structural representation, fiber-optic grating sensor group measurement is sent to fiber Bragg grating (FBG) demodulator 1 place with the carrier that is changed to of reflected light wavelength via Transmission Fibers, fiber Bragg grating (FBG) demodulator is to each paths light wave demodulation process in addition, change wireless signal into via radio modem 2 to be again sent to central database 3 place and to be preserved, the data by storing in radio modem access central database 3 after monitoring host computer 5 obtains access rights.Further, former Plotting data is become spectrogram by monitoring host computer, be that some unimodal spectral curves are formed by stacking by Gauss curve fitting by originally discrete data fitting, the wavelength time-histories figure of each fiber-optic grating sensor group reflected light can be obtained thus, the strain time history curve of each monitoring point can be obtained after converting.
In sum, the utility model is applicable to construction and the operation and maintenance stage of immersed tube tunnel, fiber-optic grating sensor group is arranged in the multiple section of immersed tube tunnel multiple some position during monitoring, form the monitoring system of a set of net like distribution, the overall degenerative conditions of monitoring immersed tube tunnel, can guiding construction and be that later stage operation maintenance is for referencial use; Sensor fiber grating adopts phase mask plate legal system standby, and by the flute profile degree of depth of control phase mask plate with account for wide ratio, obtained high-quality fiber grating, and monitoring section corrects by fiber-optical grating temperature sensor, and monitoring result accuracy is high; The utility model adopts the mode of wireless remote data transmission, greatly facilitates carrying out of monitoring, really can accomplish remote monitoring.
Claims (5)
1. an immersed tube tunnel DEFORMATION MONITORING SYSTEM, comprise fiber-optic grating sensor group, fiber Bragg grating (FBG) demodulator and monitoring host computer, described fiber-optic grating sensor group is connected with Transmission Fibers, the described Transmission Fibers other end is connected to fiber Bragg grating (FBG) demodulator, described fiber Bragg grating (FBG) demodulator is connected to monitoring host computer by wireless remote, it is characterized in that: each fiber-optic grating sensor group comprises 6 for monitoring fiber Bragg grating strain sensor and 1 fiber-optical grating temperature sensor for temperature correction of each monitoring point strain of immersed tube tunnel section, described fiber Bragg grating strain sensor is installed on section each monitoring point place, the each section of immersed tube tunnel is all provided with a fiber-optical grating temperature sensor, described fiber Bragg grating (FBG) demodulator is incident in all fiber-optic grating sensor groups in test section by sending detection light through Transmission Fibers, and the reflected light be reflected back by fiber grating, again through fiber Bragg grating (FBG) demodulator demodulation, obtains the wavelength signals of each sensor reflected light, monitoring host computer carries out data transmission by wireless remote data transmission network and fiber Bragg grating (FBG) demodulator, and processes data, to obtain the strain of each monitoring point.
2. immersed tube tunnel DEFORMATION MONITORING SYSTEM according to claim 1, it is characterized in that: immersed tube tunnel DEFORMATION MONITORING SYSTEM carries out Real-Time Monitoring to the multiple section of immersed tube tunnel simultaneously, each section is all provided with a fiber-optic grating sensor group, fiber-optic grating sensor group and the welding of branch road Transmission Fibers phase, branch road transfer tube comes together in the total Transmission Fibers in main line, finally be connected to fiber Bragg grating (FBG) demodulator, form the real-time monitoring system of a set of multibreak multi-point.
3. immersed tube tunnel DEFORMATION MONITORING SYSTEM according to claim 1 and 2, it is characterized in that: each passage of described fiber Bragg grating (FBG) demodulator is connected with each backbone transport optical fiber, fiber Bragg grating (FBG) demodulator sends detection light by Transmission Fibers to each fiber-optic grating sensor group, and carries out demodulation process to reflected light.
4. immersed tube tunnel DEFORMATION MONITORING SYSTEM according to claim 1 and 2, is characterized in that fiber Bragg grating (FBG) demodulator comprises:
1) key power switch: the 30 degree of power supplys that turn clockwise after inserting key are connected, and after return, power supply disconnects;
2) power light: system works is often bright;
3) system failure pilot lamp: internal system breaks down often bright;
4) network service pilot lamp: Ethernet communication is flicker;
5) data acquisition pilot lamp: Chang Liang after system energization self-inspection, expression can image data;
6) passage pilot lamp: indicate each passage current working state;
7) the eight external optical-fibre channels in tunnel: interface type is FC/APC, external various grating sensor;
8) Ethernet interface: be connected with radio modem, transmitting code changes wireless signal into and is sent to central database;
9) relay expansion interface: control peripherals;
10) system debug interface: for debugging system;
11) communication serial ports: with other device talk;
12) SIM card socket: change Monitoring Data into transmitting code by SIM card
13) power cord jack: connect external power supply, power to fiber grating demodulation device.
5. immersed tube tunnel DEFORMATION MONITORING SYSTEM according to claim 1 and 2, it is characterized in that: the data transmission between fiber Bragg grating (FBG) demodulator and monitoring host computer is with wireless remote data transmission network medium, described wireless remote transmission system comprises the client wireless modulator-demodular unit at field monitoring station, client transmissions program in (FBG) demodulator, central database, user side radio modem, transmission procedure composition in monitoring host computer, the Monitoring Data of each monitoring point by wireless network transmissions to central database, central database carries out pre-service and typing to data message, ensure the accurate and effective of data, user side can conduct interviews to the data in central database after obtaining authority.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092304A (en) * | 2016-08-16 | 2016-11-09 | 武汉理工大学 | For monitoring the distributed optical fiber vibration sensor system of blasting vibration |
| CN109210384A (en) * | 2018-09-13 | 2019-01-15 | 上海万朗水务科技有限公司 | Sewage treatment main pipe tube Net Information System |
| CN109443430A (en) * | 2018-10-31 | 2019-03-08 | 武汉理工大学 | Fluid pressure line real time on-line monitoring and fault diagnosis system based on optical fiber grating sensing |
| CN110231057A (en) * | 2019-06-25 | 2019-09-13 | 苏州力佳达电子科技有限公司 | A kind of tunnel safety monitoring device based on fibre optical sensor |
| CN110440707A (en) * | 2019-08-28 | 2019-11-12 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of soft raft service state real-time monitoring and evaluation system and method based on distribution type fiber-optic |
| CN110595377A (en) * | 2019-09-25 | 2019-12-20 | 武汉理工大学 | Spatial three-dimensional system for monitoring lining deformation of underground cavern for long time |
| CN113483731A (en) * | 2021-06-01 | 2021-10-08 | 武汉理工大学 | Multi-azimuth tunnel structure health online monitoring system based on optical fiber sensing |
| CN113720296A (en) * | 2021-08-30 | 2021-11-30 | 中交第一航务工程局有限公司 | Immersed tube underwater deformation monitoring method |
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- 2015-01-23 CN CN201520050722.8U patent/CN204479034U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092304A (en) * | 2016-08-16 | 2016-11-09 | 武汉理工大学 | For monitoring the distributed optical fiber vibration sensor system of blasting vibration |
| CN106092304B (en) * | 2016-08-16 | 2019-01-25 | 武汉理工大学 | For monitoring the distributed optical fiber vibration sensor system of blasting vibration |
| CN109210384A (en) * | 2018-09-13 | 2019-01-15 | 上海万朗水务科技有限公司 | Sewage treatment main pipe tube Net Information System |
| CN109443430A (en) * | 2018-10-31 | 2019-03-08 | 武汉理工大学 | Fluid pressure line real time on-line monitoring and fault diagnosis system based on optical fiber grating sensing |
| CN109443430B (en) * | 2018-10-31 | 2020-10-16 | 武汉理工大学 | Hydraulic pipeline real-time online monitoring and fault diagnosis system based on fiber bragg grating sensing |
| CN110231057A (en) * | 2019-06-25 | 2019-09-13 | 苏州力佳达电子科技有限公司 | A kind of tunnel safety monitoring device based on fibre optical sensor |
| CN110440707A (en) * | 2019-08-28 | 2019-11-12 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of soft raft service state real-time monitoring and evaluation system and method based on distribution type fiber-optic |
| CN110595377A (en) * | 2019-09-25 | 2019-12-20 | 武汉理工大学 | Spatial three-dimensional system for monitoring lining deformation of underground cavern for long time |
| CN113483731A (en) * | 2021-06-01 | 2021-10-08 | 武汉理工大学 | Multi-azimuth tunnel structure health online monitoring system based on optical fiber sensing |
| CN113720296A (en) * | 2021-08-30 | 2021-11-30 | 中交第一航务工程局有限公司 | Immersed tube underwater deformation monitoring method |
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