CN204142402U - A kind of pepe monitoring system based on distributed fiberoptic sensor - Google Patents
A kind of pepe monitoring system based on distributed fiberoptic sensor Download PDFInfo
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- CN204142402U CN204142402U CN201420474719.4U CN201420474719U CN204142402U CN 204142402 U CN204142402 U CN 204142402U CN 201420474719 U CN201420474719 U CN 201420474719U CN 204142402 U CN204142402 U CN 204142402U
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Abstract
The utility model relates to detection technique field, and particularly relate to a kind of pepe monitoring system based on distributed fiberoptic sensor, it comprises: distributed fiberoptic sensor, and described distributed fiberoptic sensor is laid in the bottom of described drainage pipeline; Transmission Fibers; Test cell; And data processing unit; The fiber cores of described distributed fiberoptic sensor connects described test cell by described Transmission Fibers, and described test cell is electrically connected with described data processing unit.Pepe monitoring system based on distributed fiberoptic sensor described in the utility model utilizes the distributed nature of distributed fiberoptic sensor and transmission not to be subject to the feature of such environmental effects, distributed fiberoptic sensor is laid on the bottom of pipeline to be detected, can the foreign material silting of this segment pipe of Real-Time Monitoring and the pipeline situation of caving in, thus understand the ruuning situation of underground pipeline in real time, be conducive to pipeline maintenance and repair.
Description
Technical field
The utility model relates to detection technique field, field, particularly relates to a kind of pepe monitoring system based on distributed fiberoptic sensor.
Background technology
Along with the continuous quickening of urbanization process, municipal drainage facility also becomes an important foundation engineering of Modernized City Construction and development, is to ensure that citizen produce and requisite infrastructure of living.The productive life of drainage pipeline operation conditions and people is closely related, and drainage pipeline mud is piled up, blocking, and cause sewage outflow, surface gathered water, both contaminated environment was also blocked traffic, and brought many inconvenience to resident.Therefore, how preventing drainage pipeline mud from blocking, stop sewage outflow, is the major issue of pendulum in face of administrative authority.Understand the ruuning situation of underground pipeline, carry out repair and maintenance work in time, a challenging job for pipeline maintenances numerous in big city and reparation, this often needs a large amount of manpower and materials, piping disease recognition system can the running status of the existing pipeline of accurate evaluation, defect in testing pipes and deterioration extent, have wide practical use in urban discharging pipeline detects and safeguards.
On the other hand, Fibre Optical Sensor has that radiationless interference, electromagnetism interference are good, good chemical stability, wherein distributed fiberoptic sensor not only has the advantage of general Fibre Optical Sensor, and can, along the path of optical fiber obtaining measured field continuous distribution information over time and space simultaneously, can accomplish as the nervous system of people, to carry out remote monitoring to each position of infrastructure engineering facility.Therefore there is the application prospect of wide model, in the stress mornitoring of the buildingss such as civilian and national defence such as city gas pipeline, city transmission of electricity/communication cable, submarine oil-transportation feed channel, subsea cable, reservoir dam, bridge, tunnel, highway, main facilities, have the advantage of uniqueness.
Distributing optical fiber sensing in Fibre Optical Sensor adopts unique distribution type fiber-optic Detection Techniques, to along the space distribution on optical fiber transmission path and the change information sensor measuring or monitor in time, sensor fibre is arranged along field by it, space distribution and the information over time of tested field can be obtained simultaneously, have many attractive forces for many commercial Application.Simultaneously the principle of work of distributed fiberoptic sensor utilizes optical fiber as sensing responsive element and signal transmission medium, adopt advanced OTDR (optical time domain reflection) technology, detect the change of temperature along optical fiber diverse location and strain, realize real distributed measurement.
As shown in Figure 2, in prior art, the defect of optical fiber microsensor is:
(1) are the parts forming optical fiber microsensor necessity for the formation of the first mould 2 of the Microbend structures 11 of optical fiber 1 and the second mould 3, and the processing and manufacturing of the first mould 2 or the second mould 3 is difficult, and adds the manufacturing cost of optical fiber microsensor;
(2) optical fiber 1 is almost straight-run between the first mould 2 and the second mould 3, judges that stress point utilizes the light velocity in optical fiber 1 to judge, thus judges that the strain resolution of stress point is low.
At present, there is not the pepe monitoring system based on distributed fiberoptic sensor based on distributed fiberoptic sensor in prior art.
Utility model content
The purpose of this utility model is to provide a kind of pepe monitoring system based on distributed fiberoptic sensor based on distributed fiberoptic sensor, to realize the Real-Time Monitoring of situation of caving in drainage pipeline foreign material silting and pipeline.
In order to achieve the above object, the technical solution of the utility model is achieved in that
Based on a pepe monitoring system for distributed fiberoptic sensor, comprising:
Distributed fiberoptic sensor, described distributed fiberoptic sensor is laid in the bottom of described drainage pipeline;
Transmission Fibers;
Test cell; And
Data processing unit;
The fiber cores of described distributed fiberoptic sensor connects described test cell by described Transmission Fibers, and described test cell is electrically connected with described data processing unit.
In further technical scheme, described distributed fiberoptic sensor comprises:
Conveyor screw, described conveyor screw comprises the fiber cores being bent into constant pitch cylindrical spiral shape, and described spirochetal diameter equals the critical bend radius of described fiber cores;
Be wrapped in the covering outside described fiber cores; And
Be wrapped in the protective seam outside described conveyor screw.
Preferably, described fiber cores is made up of quartz glass optical fiber or resin and plastic optical fiber.
Preferably, described covering is made up of PU (polycarbamate abbreviation polyurethane) material or PVC (Polyvinylchloride) material.
Preferably, described protective seam is made up of silica gel material.
Preferably, described test cell is optical time domain reflectometer.
Preferably, the described pepe monitoring system based on distributed fiberoptic sensor also comprises the alarm unit be electrically connected with described data processing unit.
Preferably, described alarm unit is pilot lamp and/or hummer.
Preferably, described data processing unit is central processing unit, single-chip microcomputer, programmable logic controller (PLC) or flush bonding processor.
Compared with prior art, the utility model has the advantage of: the described pepe monitoring system based on distributed fiberoptic sensor utilizes the distributed nature of distributed fiberoptic sensor and transmission not to be subject to the feature of such environmental effects, distributed fiberoptic sensor is laid on the bottom of pipeline to be detected, can the foreign material silting of this segment pipe of Real-Time Monitoring and the pipeline situation of caving in, thus understand the ruuning situation of underground pipeline in real time, be conducive to pipeline maintenance and repair.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The functional-block diagram of the pepe monitoring system based on distributed fiberoptic sensor that Fig. 1 provides for the utility model embodiment;
Fig. 2 is the structural representation of optical fiber microsensor in prior art;
The front elevation after protective seam removed by the distributed fiberoptic sensor that the pepe monitoring system based on distributed fiberoptic sensor that Fig. 3 provides for the utility model embodiment adopts;
Fig. 4 is the spirochetal structural representation shown in Fig. 3;
Fig. 5 is the schematic cross-section being enclosed with the fiber cores of covering shown in Fig. 3;
The stressing conditions schematic diagram of the distributed fiberoptic sensor that the pepe monitoring system based on distributed fiberoptic sensor that Fig. 6 provides for the utility model embodiment adopts;
The curve synoptic diagram reflected on optical time domain reflectometer under the stressing conditions that the distributed fiberoptic sensor that the pepe monitoring system based on distributed fiberoptic sensor that Fig. 7 provides for the utility model embodiment adopts is shown in figure 6.
Embodiment
Carry out clear, complete description below with reference to the technical scheme of accompanying drawing to each embodiment of the utility model, obviously, described embodiment is only a part of embodiment of the present utility model, instead of whole embodiments.Based on the embodiment in the utility model, other embodiments all that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belong to the scope that the utility model is protected.
Implement side 1
Present embodiments provide a kind of pepe monitoring system based on distributed fiberoptic sensor, as shown in Figure 1, it is the frame principle figure of the pepe monitoring system based on distributed fiberoptic sensor that this provides by new embodiment, the described pepe monitoring system based on distributed fiberoptic sensor comprises distributed fiberoptic sensor 6, Transmission Fibers 7, test cell 8 and data processing unit 9, particularly, described distributed fiberoptic sensor 6 is laid in the bottom of drainage pipeline, the fiber cores 5 of this distributed fiberoptic sensor 6 is by Transmission Fibers 7 connecting test unit 8, described test cell 8 is electrically connected with data processing unit 9, judged the stressing conditions (silting that this stressing conditions reflects the drainage pipeline being laid with this distributed fiberoptic sensor 6 subside situation) of this distribution sensor according to the light loss situation of distributed fiberoptic sensor 6 by test cell 8 and data processing unit 9, and stressing conditions is shown by curve map.
In specific implementation process, can, by distributed fiberoptic sensor 6 along pipe installation, realize detecting without blind spot leak source.Particularly, one or more distributed fiberoptic sensor 6 is laid bottom drainage pipeline, every bar sensor terminal connects a test cell 8, test cell 8 is by data line connection data processing unit 9 (computer system), by the computer system software being embedded in data processing unit 9 light reflected signal be analyzed and show the state of whole pipe network: utilizing the characteristic continuous probe whole pipeline bottom pressure of distributed fiberoptic sensor 6 to change, recycling test cell 8 (such as OTDR) extracts the pressure distribution of sensor whole process, then this pressure distribution curve is passed to data processing unit 9 to be analyzed and the state showing whole pipe network, can intuitively show mixed and disorderly substances in pipe silting, the real time datas such as pipe collapse, the situation that in real-time reflection pipeline, foreign material silting and pipeline cave in.
In the present embodiment, pepe monitoring system based on distributed fiberoptic sensor utilizes the distributed nature of distributed fiberoptic sensor 6 and transmission not to be subject to the feature of such environmental effects, distributed fiberoptic sensor 6 is laid on the bottom of pipeline to be detected, can the foreign material silting of this segment pipe of Real-Time Monitoring and the pipeline situation of caving in, thus understand the ruuning situation of underground pipeline in real time, be conducive to pipeline maintenance and repair.In order to embody other feature of the above-mentioned pepe monitoring system based on distributed fiberoptic sensor, below by example 2 to being further described in embodiment 1.
Embodiment 2
In the present embodiment, the above-mentioned distributed fiberoptic sensor 6 based on adopting in the pepe monitoring system of distributed fiberoptic sensor being made further improvements, first introducing Fibre Optical Sensor, especially the present situation of optical fiber micro-bending sensor:
The principle of work of Fibre Optical Sensor is: when after fibre-optical bending, always there is the energy emission along fiber bending radius direction, guided modes in original optical waveguide will become radiation mode, thus cause bending loss, and this loss can be divided into microbend loss and macrobend loss.Usually the optical fiber microsensor of corresponding above-mentioned microbend loss is adopted in prior art, as shown in Figure 2, it is the structural representation of optical fiber microsensor in prior art, optical fiber microsensor comprises optical fiber 1, and the first mould 2 and the second mould 3 matched each other, wherein optical fiber 1 has Microbend structures 11, this Microbend structures 11 is that the first mould 2 by matching each other and the second mould 3 are formed, particularly, first mould 2 and the second mould 3 are oppositely arranged, at the first mould 2, the side of the second mould 3 is provided with the first wave structure 21, correspondingly in the second die face 3, the side of the first mould 2 is provided with the second wave structure 31 matched with the first wave structure 21, the manufacture process of the Microbend structures 11 of optical fiber microsensor is: the both sides first the first mould 2 and the second mould 3 being placed on respectively optical fiber 1, and the position of Microbend structures 11 to be formed on optical fiber 1 is placed between described first mould 2 and the second mould 3, then exert oneself (power F as shown in Figure 2) extrude the first mould 2 and the second mould 3, on optical fiber 1, above-mentioned Microbend structures 11 is formed with the interaction of the second wave structure 31 of the first wave structure 21 and the second mould 3 that utilize the first mould 2.
Above-mentioned optical fiber microsensor in principle of work is, the pressure change acted on the first mould 2 or the second mould 3 can cause the spacing between two moulds to change, thus cause intensity variation or the light loss change of optical fiber 1, by the intensity variation of detection fiber 1 or the light loss change of optical fiber 1, can realize acting on the pressure survey on the first mould 2 or the second mould 3.
For solving the processing and manufacturing difficulty that optical fiber microsensor in prior art exists, the defect that manufacturing cost is large, strain resolution is low; in the present embodiment; following improvement is done to based on the distributed fiberoptic sensor 6 adopted in the pepe monitoring system of distributed fiberoptic sensor; as shown in Figure 3; be the front elevation after protective seam removed by this distributed fiberoptic sensor 6, described distributed fiberoptic sensor 6 comprises conveyor screw, covering 4 and protective seam.
Particularly, described conveyor screw comprises the fiber cores 5 being bent into constant pitch cylindrical spiral shape, namely the shape of fiber cores 5 is the cylindrical spiral shape being similar to common spring, and spiral-shaped pitch is equal, here, what deserves to be explained is, the diameter of above-mentioned fiber cores 5 needs selected according to measurement, pitch carries out concrete demarcation according to the measurement pressure limit of embody rule environment and precision, above-mentioned method that is selected and that demarcate belongs to the technological means that those skilled in the art's routine adopts, therefore no longer repeats in this article.Importantly, for limiting the light loss consumption of distributed fiberoptic sensor 6, (conveyor screw outline is cylindrical for described spirochetal diameter, spirochetal like this diameter refers to this columniform diameter) equal the critical bend radius of described fiber cores 5, here, for the fiber cores 5 of any specification, all unique to there being a critical bend radius, this parameter is well-known to those skilled in the art, therefore no longer repeats this parameter in this article.In addition, with reference to Fig. 4 and Fig. 5, described covering 4 is wrapped in the outside of fiber cores 5, and in preferred embodiment of the present utility model, the end face of fiber cores 5 is circular, and covering 4 is coated on the periphery of fiber cores 5, to protect fiber cores 5.Described protective seam is wrapped in this spirochetal outside along spirochetal axis; one side is protected the conveyor screw of its inside and covering 4, and this protective seam, covering 4 and spirochetal structure make the radial direction of described distributed fiberoptic sensor 6 have certain elasticity on the other hand.
The principle of work of above-mentioned distributed fiberoptic sensor 6 is: the distributed fiberoptic sensor 6 that the present embodiment provides utilizes bending loss of optical fiber in microbend loss phenomenon with the increase of bending radius physical phenomenon on a declining curve, fiber cores 5 is made into solenoid type structure (the constant pitch cylindrical spiral shape namely above mentioned), then covering 4 is superscribed in the outside of fiber cores 5, finally superscribe protective seam in whole spirochetal outside, when applying external force on the protection layer and being transmitted in fiber cores 5 by covering 4, fiber cores 5 can because of this external force generation deformation, thus cause bending loss of optical fiber.In actual applications, general use optical time domain reflectometer (Optical Time Domain Reflectometer, OTDR) input a series of smooth surging and enter fiber cores 5 to check backscattering level, the light signal strength reflected can be measured, and be the function of time, therefore it can be turned the length being counted as fiber cores 5, the signal of the stressed front and back of comparative analysis just can accurately measure the size of external force suffered by distributed fiberoptic sensor 6 optional position.
The principle of work of distributed fiberoptic sensor 6 in the present embodiment is described below in conjunction with Fig. 6 and Fig. 7: distributed fiberoptic sensor 6 is even without radius of turn during External Force Acting, namely its light loss is everywhere consistent, therefore on optical time domain reflectometer, be reflected as the consistent straight line of a slope; And when distributed fiberoptic sensor 6 is subject to the compression of external force F1 and F2, situation as shown in Figure 6, spirochetal part radius of turn diminishes, namely the light loss of this section of fiber cores 5 correspondence becomes large, thus on optical time domain reflectometer to should the straight line of section fiber cores 5 steeper, the slope of this section of straight line is relevant with corresponding stressed size.Fig. 7 shows the curve that the stressing conditions shown in corresponding diagram 6 reflects on optical time domain reflectometer, and as can be seen from the figure, the size of straight slope change represents stressed size, and the position that the positional representation of straight slope change is stressed.
In the present embodiment, the structure of described distributed fiberoptic sensor 6 is simple, the technological means being processed as the employing of those skilled in the art's routine of its spirochetal constant pitch cylindrical spiral shape, (publication number is 101306455 such as can to utilize patent documentation, publication date is on November 19th, 2008) in the described above-mentioned conveyor screw of novel cushion helical spring winding device processing and manufacturing that arbitrarily can adjust volute spring diameter and pitch, thus can show that the processing technology of described distributed fiberoptic sensor 6 is simple, without the need to being equipped with separately corresponding mould, low cost of manufacture, in addition, the sensor that application the present embodiment provides, for the fiber cores 5 of same length, the sensor that detection range is shorter can be made, thus under the prerequisite not improving electronic device resolution, improve the resolution of measuring distance, and by spirochetal diameter design be fiber cores 5 critical bend radius or near this critical bend radius, make the fiber cores 5 of sensor all be in critical radius state, thus very high light loss sensitivity and strain resolution can be obtained, based on the distributed nature of the sensor, location survey accurately can be carried out to the deformation of dozens of kilometres continuous print, can as the sensor of the distortion measurements such as building, bridge, culvert, dam body, also can as security protection border alarm sensor.
Embodiment 3
In the present embodiment, mainly the material manufacturing each ingredient of distributed fiberoptic sensor 6 is limited further, particularly: fiber cores 5 is preferably made up of quartz glass optical fiber (SOF) or resin and plastic optical fiber (POF); Covering 4 is preferably made up of PU (polycarbamate abbreviation polyurethane) material or PVC (Polyvinylchloride) material; Protective seam is preferably made up of silica gel material.
Embodiment 4
In the present embodiment, mainly do further restriction to based on the test cell in the pepe monitoring system of distributed fiberoptic sensor and data processing unit, on the basis of above-mentioned monitoring system, increase alarm unit in addition.
Particularly, the test cell 8 of above-mentioned monitoring system can select light source and light power meter, also optical time domain reflectometer (Optical Time Domain Reflectometer can be selected, OTDR) and coincidence frequency modulated continuous wave technology (FMCW) realize quasi-distributed or distributed measurement, above-mentioned means of testing is the technological means that those skilled in the art's routine adopts, therefore no longer repeats in this article.
Further, be the exception making staff know drainage pipeline in time, the described pepe monitoring system based on distributed fiberoptic sensor also comprises the alarm unit 10 be electrically connected with data processing unit 9, and here, alarm unit 10 is pilot lamp and/or hummer.When data processing unit 9 judges that light loss consumption exceedes the threshold value of setting, this data processing unit 9 controls alarm unit 10 action.
Further, described data processing unit 9 is central processing unit (CPU), single-chip microcomputer, programmable logic controller (PLC) (PLC) or flush bonding processor.
What deserves to be explained is, from practical application angle, the pepe monitoring system based on distributed fiberoptic sensor that this enforcement side provides can be advantageously applied to Tailings Dam unwatering system, significantly can improve the safety in Tailings Dam downstream, reason is as follows: Tailings Dam refer to build a dam interception the mouth of a valley or exclosure form, in order to store up metal or non-metal mine carries out the place that ore sorts rear discharge mine tailing or other industrial residues, Tailings Dam is an artificial rubble flow dangerous matter sources with high potential energy, there is dam break danger, Tailings Dam is once accident, huge disaster and loss is caused by giving industrial and agricultural production and downstream people's lives and properties, the Application of Monitoring System provided by the present embodiment is in Tailings Dam unwatering system, the foreign material silting of the drainage pipeline of this unwatering system and pipeline can be detected in real time to cave in situation, and carry out the good and repair of dimension in time, thus significantly can improve the safety in Tailings Dam downstream.
The above, it is only preferred embodiment of the present utility model, not any pro forma restriction is done to the utility model, any those skilled in the art, do not departing within the scope of technical solutions of the utility model, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solutions of the utility model, according to any simple modification that technical spirit of the present utility model is done above embodiment, equivalent variations and modification, all still belong in the scope of technical solutions of the utility model.
Claims (9)
1. based on a pepe monitoring system for distributed fiberoptic sensor, it is characterized in that, comprising:
Distributed fiberoptic sensor, described distributed fiberoptic sensor is laid in the bottom of described drainage pipeline;
Transmission Fibers;
Test cell; And
Data processing unit;
The fiber cores of described distributed fiberoptic sensor connects described test cell by described Transmission Fibers, and described test cell is electrically connected with described data processing unit.
2., as claimed in claim 1 based on the pepe monitoring system of distributed fiberoptic sensor, it is characterized in that, described distributed fiberoptic sensor comprises:
Conveyor screw, described conveyor screw comprises the fiber cores being bent into constant pitch cylindrical spiral shape, and described spirochetal diameter equals the critical bend radius of described fiber cores;
Be wrapped in the covering outside described fiber cores; And
Be wrapped in the protective seam outside described conveyor screw.
3., as claimed in claim 2 based on the pepe monitoring system of distributed fiberoptic sensor, it is characterized in that, described fiber cores is made up of quartz glass optical fiber or resin and plastic optical fiber.
4., as claimed in claim 2 based on the pepe monitoring system of distributed fiberoptic sensor, it is characterized in that, described covering is made up of polyurethane material or pvc material.
5., as claimed in claim 2 based on the pepe monitoring system of distributed fiberoptic sensor, it is characterized in that, described protective seam is made up of silica gel material.
6. the pepe monitoring system based on distributed fiberoptic sensor as described in any one of claim 1 to 5, is characterized in that, described test cell is optical time domain reflectometer.
7. the pepe monitoring system based on distributed fiberoptic sensor as described in any one of claim 1 to 5, is characterized in that, the described pepe monitoring system based on distributed fiberoptic sensor also comprises the alarm unit be electrically connected with described data processing unit.
8., as claimed in claim 7 based on the pepe monitoring system of distributed fiberoptic sensor, it is characterized in that, described alarm unit is pilot lamp and/or hummer.
9. the pepe monitoring system based on distributed fiberoptic sensor as described in any one of claim 1 to 5, is characterized in that, described data processing unit is central processing unit, single-chip microcomputer, programmable logic controller (PLC) or flush bonding processor.
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| CN107525566A (en) * | 2017-07-27 | 2017-12-29 | 丁志国 | A kind of sewage piping lane monitoring system |
| CN108489376A (en) * | 2018-03-13 | 2018-09-04 | 中国石油化工股份有限公司 | A kind of Monitoring Pinpelines early warning system based on distributed coax cable electricity grid strain transducer |
| CN108731743A (en) * | 2018-08-23 | 2018-11-02 | 中铁第四勘察设计院集团有限公司 | Drainage pipeline on-line monitoring system and method based on OFDR distribution type fiber-optics |
| CN108759936A (en) * | 2018-08-23 | 2018-11-06 | 中铁第四勘察设计院集团有限公司 | Drainage pipeline monitoring compensation system based on OFDR distribution type fiber-optics and method |
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| CN110131486A (en) * | 2019-04-17 | 2019-08-16 | 北京百世通管道科技有限公司 | Optical fiber compound pipeline complex pipeline and its monitoring system and method for early warning |
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| CN105909910B (en) * | 2016-06-24 | 2019-06-21 | 苏州热工研究院有限公司 | A kind of line with rubber integrality on-line monitoring system |
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| CN105909910A (en) * | 2016-06-24 | 2016-08-31 | 苏州热工研究院有限公司 | On-line rubber lining integrality monitoring system |
| CN105953018B (en) * | 2016-06-24 | 2019-06-25 | 苏州热工研究院有限公司 | A kind of rubber-lining equipment on-line corrosion monitoring and control system |
| CN107525566A (en) * | 2017-07-27 | 2017-12-29 | 丁志国 | A kind of sewage piping lane monitoring system |
| CN108489376A (en) * | 2018-03-13 | 2018-09-04 | 中国石油化工股份有限公司 | A kind of Monitoring Pinpelines early warning system based on distributed coax cable electricity grid strain transducer |
| CN108775955A (en) * | 2018-07-18 | 2018-11-09 | 武汉理工大学 | A kind of petrochemical industry oil-gas pipeline corrosion state Fibre Optical Sensor on-line monitoring system |
| CN108759936A (en) * | 2018-08-23 | 2018-11-06 | 中铁第四勘察设计院集团有限公司 | Drainage pipeline monitoring compensation system based on OFDR distribution type fiber-optics and method |
| CN108731743A (en) * | 2018-08-23 | 2018-11-02 | 中铁第四勘察设计院集团有限公司 | Drainage pipeline on-line monitoring system and method based on OFDR distribution type fiber-optics |
| CN108731743B (en) * | 2018-08-23 | 2024-04-02 | 中铁第四勘察设计院集团有限公司 | Drainage pipeline on-line monitoring system and method based on OFDR distributed optical fibers |
| WO2020135764A1 (en) * | 2018-12-29 | 2020-07-02 | 安徽泽众安全科技有限公司 | Method for detecting foreign object in water supply pipe network, device, and system having same |
| CN109855536A (en) * | 2019-02-28 | 2019-06-07 | 中国海洋石油集团有限公司 | A kind of oil-gas pipeline choke detecting method based on strain measurement |
| CN110131486A (en) * | 2019-04-17 | 2019-08-16 | 北京百世通管道科技有限公司 | Optical fiber compound pipeline complex pipeline and its monitoring system and method for early warning |
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