CN110360945A - Pipe deforming monitoring and palm early warning system and method based on BOTDR - Google Patents
Pipe deforming monitoring and palm early warning system and method based on BOTDR Download PDFInfo
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- CN110360945A CN110360945A CN201910648206.8A CN201910648206A CN110360945A CN 110360945 A CN110360945 A CN 110360945A CN 201910648206 A CN201910648206 A CN 201910648206A CN 110360945 A CN110360945 A CN 110360945A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
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- 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
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- Computer Networks & Wireless Communication (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Business, Economics & Management (AREA)
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- Arrangements For Transmission Of Measured Signals (AREA)
- Length Measuring Devices By Optical Means (AREA)
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Abstract
The invention discloses a kind of pipe deforming monitoring and palm early warning system and method based on BOTDR, which includes: distributed sensing optical cable, temperature-compensating optical cable, BOTDR automatic data collection device, solar panel, digital information processing system, deformation data display terminal, alarm generator, data server cloud and palm early warning APP.And straining and sensing optical cable is laid in duct wall, the tension and compression deformation for realizing pipeline, deflection deformation, pressure state, pipe temperature progress long distance monitoring are tested by distributive fiber optic strain, result is finally uploaded to network server, staff directly passes through the health and fitness information that palm early warning APP is directly acquainted with sewage conduct, realizes to pipeline breaking prevention and fault localization.The present invention has the advantages that electromagnetism interference, transmission range are long, is easy to lay, and will not leak prison, be able to achieve the long-distance distributed real-time monitoring of large-diameter pipeline ess-strain and temperature.
Description
Technical field
The present invention relates to pipe deforming monitoring and warning system more particularly to it is a kind of based on BOTDR pipe deforming monitoring and
Palm early warning system and method.
Background technique
Municipal sewage pipe network is important one of city foundation engineering facility, it, which is responsible for, collects urban life and industry life
It produces sewage and excludes to drop to the task of city proper with the rainwater for flowing through urban district in time.With the propulsion of urbanization process, city
City's quantity of wastewater effluent is constantly soaring；Simultaneously with the continuous development of urban construction, the safety problem of infrastructure receives more next
More concerns, sewage conduct is as the important ring in basic facility, once leakage will generate the life of citizen suddenly
How unpredictable influence carries out early warning into the key solved the problems, such as to infrastructure real-time monitoring and in advance.In recent years,
The fast development of China's economy and S&T business incubator are promoted steadily, have also carried out many researchs, but light on the technical issues of monitoring
Fine sensing technology in practical basis facility using it is upper not enough extensively, the popularity of monitoring does not catch up with national economy much
Development speed brings very big threat to the life security of urban transportation and the people.
Secondly, China city remains in manned surveys' stage for the monitoring of sewage conduct, common method have ocular estimate,
Pipeline detection method under reflective mirror inspection technique, amount bucket method and diver.Although conventional monitoring methods are simple, cannot predict in time
The rupture of underground piping causes municipal sector not predict accurately and handles accident in time, causes huge safety to city
Hidden danger.Magnetic Flux Leakage Inspecting even developed in recent years, negative pressure wave detecting method, there is also lay difficult, durability is poor,
The disadvantage that maintenance expense is high, degree of integration is low is not able to satisfy the demand of city sound development.
And BOTDR Distributed Optical Fiber Sensing Techniques, to administering municipal sewage pipeline system, improve the level of urbanization without being suspected to have
Significant advantage.It breaks through the limitation of previous point sensor as a kind of emerging sensing technology, carries out signal with light
Sensing, do not influenced by electromagnetic field, realize the continuous signal sensing in a wide range of, including stress, temperature parameter.Its cost
It is low, but perception information is richer, can also accomplish electromagnetism interference, high-precision, on a large scale measurement, precision is up to 10-5Number
Magnitude.Most outstanding to be, its frequency displacement variable quantity is more much smaller than strain correlation with temperature dependency, largely makes up
Due to data fluctuations caused by temperature change.However, BOTDR system needs stable output light, therefore to light source and control
The requirement of system processed is very high.Moreover, because spontaneous brillouin scattering is quite faint, detect relatively difficult, it is desirable that signal processing system
It unites signal-to-noise ratio with higher.Moreover, due to needing to carry out a large amount of signal summation averaging, frequency in monitoring process
Scan process, thus realize that primary complete measurement needs longer time, real-time is not good enough, these technical problems all up for
We go to solve.
Summary of the invention
Goal of the invention: the purpose of the present invention is provide a kind of pipeline based on BOTDR for City Buried Pipeline deformation monitoring
Deformation monitoring and palm early warning system and method measure the strain information along pipeline using distributed monitoring technology, can
Enough real-time Transmissions realize observation datamation processing and threshold value in real time to data collecting instrument terminal and palm early warning APP
Extraction, complete with the comparison of preset value, early warning is carried out to pipeline breaking.
Technical solution: BOTDR distributed monitoring system, including distributed sensing optical cable, temperature-compensating optical cable, BOTDR number
According to automatic acquisition device, solar panel, digital information processing system, deformation data display terminal, alarm generator, data
Server cloud, palm early warning APP；Distributed fiber sensing optic cable and temperature-compensating optical cable with BOTDR automatic data collection
Device connection, BOTDR automatic data collection device onboard data automatic collection function and wireless transmission function, with distributed sensing
Optical cable connection, completes the acquisition to the frequency shift amount of Brillouin scattering light frequency, after information is received by light-sensitive element, it will wireless to pass
Transport to digital information processing system, the fine Brillouin scattering optical frequency transmitted along the line of the automatic Ricoh, receiving area of digital information processing system
Rate information converts strain information for frequency information, and strain information is transferred to video data terminal, and video data terminal is logical
The deformation position information that technical treatment obtains sewage conduct is crossed, visual analyzing is completed, presents in graphical form, and strain is believed
Breath is transmitted to cloud, and alarm generator is automatically performed the comparison of threshold value and preset value, and prompting is sounded an alarm when that will reach the limit of,
The generation ruptured with early warning sewage conduct.
Strain information is wirelessly transmitted to server cloud by video data terminal, and cloud and palm early warning APP pass through base station
Data alternating is completed, in real time strain information along acquisition.Early warning APP can automatically extract the threshold value along line strain simultaneously, in threshold value
When will be more than preset value, APP can remind staff by modes such as vibration, pop-up, prompt tones.
Under the continued power of solar panel, BOTDR automatic data collection device obtains observation data, data in real time
Through being wirelessly transferred, is completed to receive and be pre-processed by digital information processing system.
Digital information processing system is filtered algorithm to system signal, and original signal is filtered rear difference and is put down
It handles, amplitude, low frequency, periodic noise signal are in removing environment to improve precision.
Alarm generator sets early warning value, and after obtaining observation data, system automatically extracts threshold value and completes and limiting value
It compares, is sounded an alarm when that will reach the limit of.
Deformation data display terminal will be uploaded to data server cloud by strain information along the line, communicate through Socket, and lead to
It crosses palm early warning APP and knows pipe deforming.
A kind of application method of the pipe deforming monitoring and palm early warning system of BOTDR, comprising the following steps:
(1) one of U-shaped groove is cut out in pipe surface so that monitoring optical cable is embedded to；
(2) optical cable is embedded in along groove, and prestressing force is applied to optical cable, optical cable is added using binder and fixture
Gu；
(3) it to the exposed portion of optical cable, penetrates hose and is protected；
(4) by optical fiber and wire jumper welding, pipeline is divided into multistage with active well, is connected to wire jumper on each active well
BOTDR automatic data collection device；
(5) data are transmitted by BOTDR automatic data collection device, connecing for signal is completed in digital information processing system
It receives, captures the parameters of Brillouin scattering in distributed sensing optical cable, flat noise reduction process, marking-threshold are carried out to parameter；
(6) digital information processing system is connected with video data terminal, video data terminal is to Digital Signal Processing
The threshold value that system captures carries out visualization processing, completes the preset value of calibration compared with threshold value, sounds an alarm when that will arrive at
Early warning is completed, and generates alarm log；
(7) video data terminal will be uploaded to data server cloud by strain information along the line, open palm early warning APP, core
To the monitoring result of palm early warning APP monitoring chart and video data terminal, whether the server that communicates based on Socket is verified
Complete the interactive extraction with threshold value of real time data；
(8) optical fiber exposed portion is stored in the protective device with warning mark after completing monitoring.
In above-mentioned steps (4), the welding step of optical fiber includes:
(41) coat of peeling optical fibre is stained with alcohol with cotton balls, is converted into V-arrangement, clamps the optical fiber shelled and covered, along optical fiber axial direction
Wiping；
(42) optical fiber both ends are trimmed using optical fiber cutter；
(43) fritting main molten electric current and time and optical fiber feeding amount are set, the optical fiber of two well cuttings is placed in later molten
It picks in groove, two butt heads is subjected to welding to positive；
(44) thermal expansion pipe is placed in connector weld, welding position is heated, complete heat at fused fiber splice position
The fixation of expansion tube.
Distributed sensing optical cable is distributed fiber optical cable or metal strain optical cable.
Working principle: the sewage conduct deformation monitoring based on BOTDR is a high-end full distributed monitoring technology, by light
Fibre is laid on pipeline, is continuously surveyed on entire fiber lengths to the external physical parameter along fiber geometries path profile
Amount, achieve the purpose that efficiently with intelligent monitoring.
BOTDR technology is one kind of Distributed Optical Fiber Sensing Techniques, and having high-precision, (precision is up to 10-5The order of magnitude), pass
Sense structure is simple, is easily installed, transmit and damage low advantage, most outstanding to be, its frequency displacement variable quantity for 0.002%/DEG C, with
Temperature dependency is more much smaller than strain correlation, data wave caused by can largely making up due to temperature change
It is dynamic.It carries out the sensing of signal with light, is not influenced by electromagnetic field, and the continuous signal sensing in a wide range of, packet may be implemented
Stress, temperature different parameters are included, detectivity while up to a hundred kilometers of temperature and stress is provided.It changes along optical fiber
Or there are when axial strain, the lattice arrangement combination of optical fiber will generate irregular variation, this will change light wherein
Propagation path, frequency displacement will occur for the frequency backwards to Brillouin scattering in optical fiber at this time, and the frequency shift amount of frequency is answered with optical fiber
The variation of change is in good linear relationship, passes through the frequency shift amount backwards to natural Brillouin scattering in measurement optical fiber, so that it may
Obtain the distributed intelligence of temperature and strain along optical fiber.
In addition, incidence end of the position scattered to pulsed light, can be calculated automatically by BOTDR automatic data collection instrument
It obtains；Change the frequency repeated measurement of incident light at regular intervals according to above-mentioned method later, so that it may obtain every on optical fiber
The spectrogram of the Brillouin scattering of a sampled point.Distributed optical cable is laid on tube wall, pipeline can be coordinated with optical cable
Deformation, this can be achieved with the monitoring to pipe deforming；
The present invention is by Brillouin light Time Domain Reflectometry BOTDR (Brillouin Optical Time Domain
Reflection) technology is monitored applied to sewage conduct damage alarm, devises a whole set of monitoring and warning system, and independent research
Palm early warning APP, by institute it is collected along a strain information be uploaded to network, to obtain the parameter along pipeline in real time, from
And the deformation of pipeline is grasped, early warning can be completed to deformation, staff can be checked whenever and wherever possible by palm early warning APP
Pipe deforming situation realizes the long range distribution of large-diameter pipeline ess-strain and temperature to reach intelligent monitoring purpose
Formula detection.
The utility model has the advantages that compared with prior art, the present invention be it is a kind of pass, the full distributed detection system of sense unification, it at
This is low, breaks through the limitation of previous point sensor, perception information is richer, can be to dozens or even hundreds of kilometer pipe deforming feelings
Condition carries out real-time measurement, and with electromagnetism interference, transmission range is long, being easy to lay and do not leak prison, sensing arrangement, simple, transmission is damaged
Consume it is low, easily with other network integrations, anticorrosive, electromagnetism interference the advantages of, can be realized large-diameter pipeline ess-strain and temperature
The long-distance distributed real-time monitoring of degree.
Detailed description of the invention
Fig. 1 is that the present invention is based on the sewage conduct deformation monitorings of BOTDR and palm early warning system schematic diagram；
Fig. 2 is certain section of active well monitoring method schematic diagram.
Specific embodiment
As shown in Figure 1, the present invention monitoring and early warning system include distributed sensing optical cable 1a, temperature-compensating optical cable 1b,
BOTDR automatic data collection device 2a, solar panel 2b, digital information processing system 3, deformation data display terminal 4a,
Alarm generator 4b, data server cloud 5 and palm early warning APP 6.
Distributed sensing optical cable 1a and temperature-compensating optical cable 1b are linearly laid on pipeline along line groove, then pulsed light into
Enter sensing optic cable 1a；BOTDR automatic data collection device 2a is accessed later, is powered by solar panel 2b, BOTDR data
Automatic acquisition device 2a onboard data automatic collection function and wireless transmission function, connect with distributed sensing optical cable, completion pair
The acquisition of the frequency shift amount of Brillouin scattering light frequency, after information is received by light-sensitive element, BOTDR automatic data collection device 2a will
Data are wirelessly transmitted to digital information processing system 3；Digital information processing system 3 receives BOTDR automatic data collection device 2a
The data of transmission, and the fine Brillouin scattering frequency information transmitted along the line of Ricoh, automatic receiving area, convert frequency information to
Strain information, the analysis processing and noise reduction, output end for completing data are connect with video data terminal 4a, video data terminal 4a
By the deformation position information of the strain result such as sewage conduct of monitoring, visual analyzing is completed, is presented in graphical form, and will answer
Become information and be transmitted to alarm generator 4b, alarm generator 4b compares data and preset early warning value, with determination
Whether early warning is needed；Strain Distribution information along pipeline is uploaded to data server cloud 5 by deformation data display terminal 4a；
Later, login palm early warning APP6, the monitoring result of verification palm early warning APP monitoring chart and video data terminal 4a whether one
It causes, whether verifying APP completes real time data interaction and the extraction of threshold value.
The application method of present system is as follows:
(1) according to construction plan, optical cable road trend, paving mode and joint location are checked, repetition measurement routes ground distance,
Required data is provided with disk, distribution and laying for optical cable.
(2) it according to the circumferential direction and lengthwise position for having selected monitoring section, is drawn lines using ink fountain and mixes default route in tube core
The solidifying upper clear terrestrial reference of soil shows, and longitudinal route of laying guarantees that route is straight, and circumferential direction lays route and guarantees that route circumferential direction is closed into
It is round.
(3) along the tag line finished, the U-shaped groove of one of depth 3mm is cut out, with cutting machine in pipe surface so as to handle
Monitor optical cable embedment；In pipeline fiber deployment intersection, groove curve transition is carried out.
(4) the sandstone clast generated in cutting process can lay sticking effect when " stickup comprehensively " and survey to optical cable
Accuracy of measurement impacts, it is therefore desirable to carry out cleaning dust removal to circuit surface is polished smooth, and repeatedly cut to portion route
It modifies straight, sonet card is avoided to break problem.
(5) monitoring optical cable is embedded in along groove, and be fitted on sewage conduct lateral margin to generate coordination with pipeline
The effect of deformation is laid with the temperature-compensating optical cable for being cased with round tube, is drawn optical cable to pipeline with terminal dragger or guiding device
Groove fixes position, places bracket, is fixed with fixture, welding manner is reinforced.When reinforcing, needs to apply optical cable and answer in advance
Power allows optical cable compatible deformation can occur with pipeline, improves resolution ratio and measurement accuracy, reach the mesh of deformation monitoring along pipeline
's.
(6) along optical cable laying, the optical cable fixed with bracket is carried out in a manner of " pasting " comprehensively with polymer agent
It is completely fixed；Colloid is heated using hair drier after laying, improves bonding force.
(7) it after completing optical cable and fixing, to the exposed portion of optical cable, penetrates hose and is protected；By optical cable along pipeline
Hose is penetrated, is sealing into groove together using binder；Optical fiber exposed parts are pierced by outside pipe using hose, are reinforced anti-
Shield makees place mat for the connecting of optical fiber.
(8) under the protection of heat-shrinkable T bush, optical fiber 1c and wire jumper are subjected to welding with optical fiber splicer, and according to pipeline
Pipeline is divided into several segments with active well m, on the pipeline 9 of each active well connected wire jumper 8 by the design conditions of inspection shaft
To BOTDR fiber data automatic acquisition device 2a, as shown in Fig. 2, the collection of complete paired observations.
(9) data are emitted by fiber-optic signal transmitter, the reception of signal is completed in digital information processing system 3, captured
The parameters of Brillouin scattering in distributed sensing optical cable carry out noise reduction process, marking-threshold to parameter.
(10) digital information processing system 3 is connected with video data terminal 4a, video data terminal 4a believes number
The threshold value that number processing system 3 captures carries out visualization processing, and complete in palm alarm generator 4b the preset value of calibration with
The comparison of threshold value sounds an alarm when that will arrive at and completes early warning, and generates alarm log；
(11) video data terminal 4a will be uploaded to data server cloud 5 by strain information along the line, open mobile terminal palm
Early warning APP6, whether verification palm early warning APP monitoring chart is consistent with the monitoring result of video data terminal 4a, and verifying APP is
It is no to complete the interactive extraction with threshold value of real time data.
(12) to avoid damaging, optical fiber exposed portion is stored into the protective device with warning mark after completing monitoring
In.
In above-mentioned steps (4) therein, the welding step of optical fiber includes:
(41) coat of peeling optical fibre is stained with alcohol with cotton balls, is converted into V-arrangement, clamps the optical fiber shelled and covered, along optical fiber axial direction
Wiping；
(42) optical fiber both ends are trimmed using optical fiber cutter；
(43) fritting main molten electric current and time and optical fiber feeding amount are set, the optical fiber of two well cuttings is placed in later molten
It picks in groove, two butt heads is subjected to welding to positive；
(44) thermal expansion pipe is placed in connector weld, welding position is heated, complete heat at fused fiber splice position
The fixation of expansion tube.
In jacking construction section and open excavation section, respectively corresponds two kinds of optical cables of fiber and metal strain and laid, it later will pipe
Road is seated in the soil body.In jacking construction section, along two central axes of pipeline, in the top of inner wall of the pipe, bottom and two waists
2 different optical cables are respectively laid, the deformation and temperature-compensating of measurement pipeline are respectively used to.In open excavation section, on the upside of pipeline outer wall
From pipeline central axes at 45 degree of angles, on the downside of pipeline outer wall with pipeline central axes at the light that respectively to lay 2 at 65 degree of angles different
Cable is respectively used to the deformation and temperature-compensating of measurement pipeline；By the distribution optical cable 1a and temperature-compensating optical cable 1b according to upper
After stating the laying of method completion pipeline and connecting whole system, the monitoring for pipe deforming can be realized.
In order to make obtain deformation data it is more accurate, for 200 meters, an active well is set, can on active well
Real-time monitoring is carried out with tie jumper, can monitor the deformation information of this section simultaneously.The standard of early warning depends on along optical fiber
Dependent variable, if the result continuously monitored twice is compared, maximum disparity has been more than 400 μ ε, then assert that optical fiber strains at this
Amount mutates, that is, confirms that biggish deformation has occurred for pipeline at this, indication pipeline will rupture.
Claims (9)
1. a kind of pipe deforming monitoring and palm early warning system based on BOTDR, it is characterised in that: including distributed sensing optical cable
(1a), temperature-compensating optical cable (1b), BOTDR automatic data collection device (2a), solar panel (2b), Digital Signal Processing
System (3), deformation data display terminal (4a), alarm generator (4b), data server cloud (5) and palm early warning APP
(6)；The distributed fiber sensing optic cable (1a) and temperature-compensating optical cable (1b) with BOTDR automatic data collection device (2a)
Connection；The BOTDR automatic data collection device (2a) data are acquired after through being wirelessly transferred, by digital information processing system
(3) it receives；Digital information processing system (3) output end is connect with deformation data display terminal (4a), is shown eventually by data
Complete visualization processing in end；The deformation data display terminal (4a) connect with alarm generator (4b), and alarm generator is automatic
Complete the comparison of division of a ci poem value and preset value；Strain Distribution information along pipeline is wirelessly transmitted to by deformation data display terminal (4a)
Data server cloud (5)；Palm early warning APP (6) receives the data of data server cloud (5) automatically, obtains pipeline in real time
Deformation.
2. the pipe deforming monitoring and palm early warning system according to claim 1 based on BOTDR, it is characterised in that:
Under the continued power of solar panel (2b), BOTDR automatic data collection device (2a) obtains observation data, data warp in real time
Wireless transmission is completed to receive and be pre-processed by digital information processing system (3).
3. the pipe deforming monitoring and palm early warning system according to claim 1 based on BOTDR, it is characterised in that: institute
Digital information processing system (3) are stated, algorithm is filtered to system signal, original signal is filtered rear difference and average place
It manages, amplitude, low frequency, periodic noise signal are in removing environment to improve precision.
4. the pipe deforming monitoring and palm early warning system according to claim 1 based on BOTDR, it is characterised in that: institute
Alarm generator (4b) setting early warning value is stated, after obtaining observation data, system automatically extracts the ratio of threshold value and completion and limiting value
It is right, it is sounded an alarm when that will reach the limit of.
5. the pipe deforming monitoring and palm early warning system according to claim 1 based on BOTDR, it is characterised in that: institute
Data server cloud (5) will be uploaded to by strain information along the line by stating deformation data display terminal (4a), be communicated through Socket, and lead to
It crosses palm early warning APP and knows pipe deforming.
6. the pipe deforming monitoring and palm early warning system according to claim 1 based on BOTDR, it is characterised in that: institute
It states palm early warning APP and deformation along the pipeline of data server cloud (5) transmission is received by base station, and automatically extract threshold value,
When threshold value is more than preset value, palm early warning APP alarm.
7. a kind of user using pipe deforming monitoring and palm early warning system as described in claim 1 based on BOTDR
Method, it is characterised in that: the following steps are included:
(1) one of U-shaped groove is cut out in pipe surface so that monitoring optical cable is embedded to；
(2) optical cable is embedded in along groove, and prestressing force is applied to optical cable, optical cable is reinforced using binder and fixture；
(3) it to the exposed portion of optical cable, penetrates hose and is protected；
(4) by optical cable and wire jumper welding, pipeline is divided into multistage with active well, is connected to wire jumper on each active well
BOTDR automatic data collection device (2a)；
(5) data are transmitted by BOTDR automatic data collection device (2a), signal is completed in digital information processing system (3)
It receives, captures the parameters of Brillouin scattering in distributed sensing optical cable, flat noise reduction process is carried out to parameter, marks threshold
Value；
(6) digital information processing system (3) is connected with video data terminal (4a), video data terminal (4a) believes number
The threshold value that number processing system (3) captures carries out visualization processing, the preset value of calibration is completed compared with threshold value, when that will arrive at
It sounds an alarm and completes early warning, and generate alarm log；
(7) video data terminal (4a) will be uploaded to data server cloud (5) by strain information along the line, open palm early warning APP
(6), the monitoring result of verification palm early warning APP monitoring chart and video data terminal (4a), what verifying was communicated based on Socket
Whether server completes the interactive extraction with threshold value of real time data；
(8) optical fiber exposed portion is stored in the protective device with warning mark after completing monitoring.
8. the application method according to claim 7 using pipe deforming monitoring and palm early warning system based on BOTDR,
It is characterized by: in step (4), the step of fused fiber splice, includes:
(41) coat of peeling optical fibre is stained with alcohol with cotton balls, is converted into V-arrangement, clamps the optical fiber shelled and covered, and wipes along optical fiber axial direction
It wipes；
(42) optical fiber both ends are trimmed using optical fiber cutter；
(43) fritting main molten electric current and time and optical fiber feeding amount are set, the optical fiber of two well cuttings is placed in heat sealing machine later
In groove, two butt heads are subjected to welding to positive；
(44) thermal expansion pipe is placed in connector weld, welding position is heated, complete to thermally expand at fused fiber splice position
The fixation of pipe.
9. the pipe deforming monitoring and palm early warning system according to any one of claim 1 to 6 based on BOTDR,
Be characterized in that: the distributed sensing optical cable (1a) is distributed fiber optical cable or metal strain optical cable.
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| CN110984247A (en) * | 2019-11-15 | 2020-04-10 | 河海大学 | Foundation pit supporting axial force monitoring and early warning system and method based on OFDR optical fiber sensing |
| CN111141416A (en) * | 2020-01-09 | 2020-05-12 | 中国电建集团华东勘测设计研究院有限公司 | Method for detecting position of pipeline external water entering buried pipeline or dark culvert by Brillouin optical time domain analysis technology |
| CN111156425A (en) * | 2020-01-15 | 2020-05-15 | 中国石油大学(北京) | Pipeline state monitoring method, device and system |
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| CN112555690A (en) * | 2020-11-18 | 2021-03-26 | 中国石油集团渤海钻探工程有限公司 | Oil-gas pressure pipeline damage monitoring and early warning method |
| CN113390385A (en) * | 2021-06-15 | 2021-09-14 | 山西格盟中美清洁能源研发中心有限公司 | Gas pipeline strain monitoring and early warning system and method based on displacement sensor |
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| CN114485455A (en) * | 2022-04-14 | 2022-05-13 | 中建安装集团有限公司 | Bullet tank strain and temperature intelligent monitoring system and method based on distributed optical fiber |
| CN114801302A (en) * | 2022-05-25 | 2022-07-29 | 华中科技大学 | Intelligent press machine with built-in deformation compensation module |
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| CN114485455A (en) * | 2022-04-14 | 2022-05-13 | 中建安装集团有限公司 | Bullet tank strain and temperature intelligent monitoring system and method based on distributed optical fiber |
| CN114485455B (en) * | 2022-04-14 | 2022-06-17 | 中建安装集团有限公司 | Bullet tank strain and temperature intelligent monitoring system and method based on distributed optical fiber |
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Application publication date: 20191022 |