CN101476879B - Self-repairing system and method for optical fibre distribution type sensor network - Google Patents
Self-repairing system and method for optical fibre distribution type sensor network Download PDFInfo
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Abstract
The invention discloses a self-repairing system and a self-repairing method for an optical fiber distributed sensor network. The system consists of a plurality of optical fiber grating sensors, a self-repairing controller, an optical fiber grating demodulator and a PC. The method is to arrange the self-repairing controller inside an optical fiber network, judge local failure of the optical fiber network after damage by a granularity calculation method, and perform recombination repair on a failed local network by a graph theory method so as to guarantee that the optical fiber network can be operated normally when partial optical fibers fail locally. When an optical fiber sensing system is damaged and partially fails, the self-repairing system and the self-repairing method can automatically recombine the network and repair the functions of the network, make an intelligent material structure capable of realizing self-repairing, and improve the reliability of the optical fiber intelligent structure in engineering application.
Description
Technical field
The present invention relates to a kind of optical fibre distribution type sensor network self-repairing system and self-repair method, belong to intellectual material structure field.
Background technology
The key concept of intellectual material structure is that sensing element, action element and control system are merged in matrix material, make structure except that ability with bearing load, also have bionic functions such as identification, analysis, processing, control, even structure self has the ability of self diagnosis, self-adaptation and the selfreparing of recombinating certainly.
Unique advantages such as optical fiber sensing system has light weight, diameter is thin, volume is little, corrosion-resistant very are suitable for making the self diagnosis network of intellectual material structure.Optical fiber sensing system has the distinct advantages of perfect biography, sense one, can arrange many sensing points on same optical fiber, constitutes distribution or accurate distributed sensor system, thus the complexity of self-diagnosable system in the simplified intelligent material structure greatly.So Fibre Optical Sensor is by the consistent sensor type that is suitable for constituting self diagnosis network in the intellectual material structure most that is known as of domestic and international research person.
After entering 21 century, domestic and international research person is more positive carries out research to intellectual material structured optical fiber self-diagnosable system, all on military-civil engineering project it has been carried out applied research both at home and abroad.Aerospace field abroad, Boeing has explored optical fiber self diagnosis network and has carried out monitoring structural health conditions on type aircraft 7E7; Airbus has also actively developed the research in this field, has explored the realization of the health monitoring of a plurality of types, comprises A320, A340-600 etc.Application on new architecture as A380, also is one of target of Airbus structural health monitoring technology exploratory development.Under the subsidy of USAF,, all adopt the fiber grating self-diagnosable system to carry out the fundamental research of monitoring structural health conditions The Application of Technology at F-18, F-22, JSF and aircraft such as DC-X2, X-33; In the Eurofight 2000 novel opportunities of combat of european union development, also adopt the optical fiber self-diagnosable system to carry out the monitoring of flight load.In the civil construction field, adopt the Fibre Optical Sensor network to constitute structure self diagnosis networks such as bridge, building at present widely its health status is monitored.Use 20 Fibre Optical Sensors as Japanese Yokohama long span footpath suspension cable bridge and constituted monitoring system, the operation state of bridge under heavy traffic and the strong wind load high stress is monitored.On the Emosson power house reservoir dam on auspicious method border the optical fiber health monitoring systems has been installed, has been used for measuring the crackle of dam body and the displacement on basis.The Como, ITA cathedral adopts 28 fiber Bragg grating sensor systems, and the settling amount of structure is monitored.Norway Norsk Hydro ASA company has installed by a plurality of fiber optic temperatures and pressure in oil field, North Sea Norway marine site and has taken into account the monitoring system that a distributed temperature sensing optical fiber constitutes, for daily production management provides mass data, make the strategic reservoir management of oil field in lifetime become possibility.In addition, external many universities and research institution are all studied the optical fiber self-diagnosis technology in continuation.
At home, some colleges and universities and research institution tightly follow the tracks of international most advanced level always, carry out the research of this respect and have obtained some achievements.On aircraft box section, adopt optical fiber sensing system to finish the research of self-diagnosable system as Nanjing Aero-Space University, can the stand under load and the damage of structure be detected, and on the wing of certain type aircraft, fiber optic sensor system has been installed Strain Distribution is monitored.Harbin University of Science and Technology beats up into employing optical fiber sensing system such as duckweed and has developed health monitoring systems at ocean platform and bridge, the Shi Bin of Nanjing University etc. adopt distributed optical fiber sensing system to carry out health monitoring in multinomial tunnel and expressway works, the Jiang Desheng of Wuhan University of Technology etc. are applied to fiber grating sensing technology the long-term safety monitoring of priority project such as a large bridge and dam surplus in the of ten, University Of Chongqing's Huang is still honest and clean, Chen Weimins etc. have been installed the fiber-optic monitoring system on engineerings such as the Giant Buddha Temple Yangtze Bridge, state to bridge etc. is monitored, these researchs and use and all obtained good economic and social benefit.In addition, also have many units being engaged in the fundamental research and the application technical research of optical fiber self diagnosis structure, also obtained gratifying achievement in research.As Tsing-Hua University, BJ University of Aeronautics ﹠ Astronautics, Tongji University, University of Science ﹠ Technology, Beijing, photoelectron technology research institute of the China Measures Institute, SanXia University etc.
In the economic development in Jiangsu Province, optical fiber self diagnosis structure has also obtained paying attention to and using.In the construction as the engineerings such as Jiang Daqiao, the third-largest bridge of yangtze river in nanjing of making the best use of the advantages in drum tower tunnel, Nanjing, tunnel, the XuanWu Lake, profit, all adopted the optical fiber self-diagnosable system, the quality and the health status of engineering have been monitored.So to the research of optical fiber self diagnosis structure technology, construction and expanding economy for our province have great importance.
Along with increasing that the optical fiber self-diagnosable system is used in engineering structure, the reliability of itself will cause people's attention.
At present, using maximum sensors in the optical fiber self-diagnosable system is optical fiber Bragg grating sensor and optical fiber BOTDR sensor.The common feature of these two kinds of sensors is can form to distribute and accurate distributed sensor system, give full play to Fibre Optical Sensor biography, feel incorporate advantage, thereby can reduce the complicacy and the cost of self-diagnosable system greatly, and farthest reduce the original structure Effect on Performance.But this system also exists some weakness, in when, as the optical fiber somewhere damage or fracture taking place, be positioned at thereafter all the sensors or sensing point with equal cisco unity malfunction, thereby whole optical fiber self-diagnosable system was lost efficacy.Because mostly optical fiber self diagnosis network is embedding or is pasted on structure, as repairing or change the self diagnosis network, certainly will will structurally go to war, and causes bigger loss.So, imperative for the research that improves optical fiber self diagnosis network reliability and self-repair function, also fiber optic network self-repairing system and self-repair method have been proposed based on this.
In order to improve the reliability of optical fiber sensing network, can make great efforts to improve the protection of optical fiber sensing system, can reduce the probability of optical fiber damage and fracture so as far as possible, improve the reliability of optical fiber sensing system.This method is that present people generally adopt, and it can reach the purpose that improves system reliability with less workload on the basis of the complicacy that does not increase fibre system.The multicore armour cables that adopt are installed the back and are selected intact optical fiber to carry out the transmission of signal more as at present when in the civil construction fiber optic sensor system being installed.Sometimes made up again after also whole optical fiber health monitoring systems being divided into the branch that 10-20 Fibre Optical Sensor form,, improved the reliability of system with the damage that alleviates optical fiber influence to system.But the protection of generally strengthening optical fiber all will increase the diameter of optical fiber, and this will inevitably exert an influence to the original structure performance.Even and strengthened protection to optical fiber, also be difficult to avoid fully the damage of optical fiber.Simultaneously, fibre system adopts the structure of branch's combination also will increase the cost and the complicacy of system greatly.In addition, sustain damage and to make the thrashing of this branch overlay area, influenced the operate as normal of structural system as certain branch.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, a kind of optical fibre distribution type sensor network self-repairing system and self-repair method are provided, when optical fiber sustains damage, can finish the selfreparing of fiber optic network.
The present invention adopts following technical scheme for achieving the above object:
A kind of optical fibre distribution type sensor network self-repairing system is made up of fiber-optic grating sensor, selfreparing controller, fiber Bragg grating (FBG) demodulator, computing machine; Wherein fiber-optic grating sensor is connected with the selfreparing controller, the signal output part of selfreparing controller is connected with the signal input part of fiber Bragg grating (FBG) demodulator, the signal output part of fiber Bragg grating (FBG) demodulator is connected with the signal input part of computing machine, and the signal output part of computing machine is connected with the signal input part of selfreparing controller.
The self-repair method of optical fibre distribution type sensor network of the present invention comprises the steps:
The first step adopts the transducing signal after fiber-optic grating sensor collects optical-fiber intelligent material structure stand under load;
In second step, fiber-optic grating sensor sends to fiber Bragg grating (FBG) demodulator with the transducing signal of above-mentioned steps collection by the selfreparing controller;
The 3rd step, fiber Bragg grating (FBG) demodulator sends to computing machine after with sensing signal demodulation, computing machine adopts Light Wave Guide Theory modeling analysis method to calculate the allowable load of optical fiber intelligent structure and the load-bearing capacity of fibre system is handled transducing signal, stand under load situation to the optical-fiber intelligent material structure is judged, has judged whether sensor failure;
The 4th step, when judged result for being, computing machine goes on foot described fail message with the 3rd and sends to the selfreparing controller; When being judged as not, then return the first step;
In the 5th step, the selfreparing controller judges to fail message that by the Granular Computing method concrete steps are:
A, utilize the relation of equivalence principle of rough set to form character attibute equivalence class and character grain pattern;
B, form number attribute equivalence class and digital grain pattern according to the relation of can not differentiating on the similarity;
C, form initial relation of equivalence, obtaining initial cluster result is the common factor of character particle collection relation of equivalence and number attribute particle collection relation of equivalence;
D, form final relation of equivalence, i.e. cluster result.
The 6th step, utilize Graph-theoretical Approach to carry out selfreparing to the localized network that lost efficacy, make that the density function expectation value of sensing point in structure on each root optical fiber all trends towards unanimity.
The invention has the beneficial effects as follows:
1, make the multifiber sensor of pasting or being embedded in the composite structure typical case test specimen constitute sensing network, carry out the monitoring of test specimen stand under load and Strain Distribution etc., and can in optical fiber sensing system, have under the situation of impaired loci, improve the reliability and the self-reparing capability of system;
2, to the influence of transducing signal, obtain the safe stand under load and the deformation condition of optical fiber self-repairing system and optical-fiber intelligent material structure by analyzing optical fiber and the own damaged of fiber-optic grating sensor (extruding, distortion, local damage etc.);
3, obtain the detection sensitive range of each point on the structure, can determine that each point is surveyed sensitive volume on the structure;
4, the self diagnosis that all can finish structure with certain precision with each root Fibre Optical Sensor is the power of figure, and guarantees that the density function expectation value of sensing point in structure on each root optical fiber all trends towards unanimity.Make the optical fiber sensing system of structure when one or a few optical fiber is subjected to local damage, still can guarantee to utilize the fiber-optic grating sensor of surviving in the affected area, automatically networking again, finish the selfreparing of network, reach the requirement that improves optical fiber self-healing network reliability.
Description of drawings
Fig. 1 optical fibre distribution type sensor self-repairing system of the present invention synoptic diagram.
Fig. 2 selfreparing controller action of the present invention synoptic diagram.
The workflow diagram of Fig. 3 self-repairing system of the present invention.
Label title among Fig. 2:
1. sensing point, 2. breakaway poing, 3. regional A, 4. an a, 5. area B.
Embodiment
As shown in Figure 1, optical fibre distribution type sensor self-repairing system of the present invention is made up of fiber-optic grating sensor, selfreparing controller, fiber Bragg grating (FBG) demodulator, computing machine; Wherein fiber-optic grating sensor is connected with the selfreparing controller, the signal output part of selfreparing controller is connected with the signal input part of fiber Bragg grating (FBG) demodulator, the signal output part of fiber Bragg grating (FBG) demodulator is connected with the signal input part of computing machine, and the signal output part of computing machine is connected with the signal input part of selfreparing controller.
The concrete composition of optical fibre distribution type sensor self-repairing system of the present invention is, a plurality of fiber-optic grating sensors receive the signal behind the optical-fiber intelligent material structure stand under load, be sent to fiber Bragg grating (FBG) demodulator (can adopt SI425 type fiber Bragg grating (FBG) demodulator) input end by the selfreparing controller, propagate into the output terminal of fiber Bragg grating (FBG) demodulator, provide the stand under load situation judgement of fibre system and optical-fiber intelligent material structure again through Computer Processing based on optical fiber intelligent structure allowable load and fibre system load-bearing capacity, the situation that further judgment part optical fiber lost efficacy, judged result input selfreparing controller, draw the many optical fiber arrangements sensor self-healing network after the reorganization, network carries out selfreparing, pass through fiber Bragg grating (FBG) demodulator once more, pass through the situation of Computer Processing output optical fibre intellectual material structure stand under load at last, thereby realized the full fiberize of whole measurement light path part.Wherein optical fiber intelligent structure allowable load and optical fiber self-diagnosable system load-bearing capacity are that the method that adopts Light Wave Guide Theory modeling analysis and verification experimental verification to combine calculates.
Fig. 3 is the process flow diagram of selfreparing controller.
Optical fibre distribution type sensor of the present invention comprises the steps: from the method for work of the self-repairing system of recombinating
The first step adopts the transducing signal after fiber-optic grating sensor collects optical-fiber intelligent material structure stand under load;
In second step, fiber-optic grating sensor sends to fiber Bragg grating (FBG) demodulator with the transducing signal of above-mentioned steps collection by the selfreparing controller;
The 3rd step, fiber Bragg grating (FBG) demodulator sends to computing machine after with sensing signal demodulation, computing machine adopts Light Wave Guide Theory modeling analysis method to calculate the allowable load of optical fiber intelligent structure and the load-bearing capacity of fibre system is handled transducing signal, stand under load situation to the optical-fiber intelligent material structure is judged, has judged whether sensor failure;
The 4th step, when judged result for being, computing machine goes on foot described fail message with the 3rd and sends to the selfreparing controller; When being judged as not, then return the first step;
In the 5th step, the selfreparing controller judges to fail message that by the Granular Computing method concrete steps are:
A, utilize the relation of equivalence principle of rough set to form character attibute equivalence class and character grain pattern;
B, form number attribute equivalence class and digital grain pattern according to the relation of can not differentiating on the similarity;
C, form initial relation of equivalence, obtaining initial cluster result is the common factor of character particle collection relation of equivalence and number attribute particle collection relation of equivalence;
D, form final relation of equivalence, i.e. cluster result.
Can carry out the adjustment (such as by the class number of appointment etc.) of class after wherein initial relation of equivalence forms as required, purpose is in order to cancel little cluster.At first obtain whole distance between objects of all objects and all the other all classes in the less class, then less class is merged to its class apart from minimum in, repeat this process, up to satisfying desired condition, so just obtain a kind of new cluster result.
The 6th step, utilize Graph-theoretical Approach to carry out selfreparing to the localized network that lost efficacy, make that the density function expectation value of sensing point in structure on each root optical fiber all trends towards unanimity.
Fig. 2 is a selfreparing controller action synoptic diagram.System can possess when finishing the structure monitoring function when the somewhere of optical fiber sensing system and sustains damage and during partial failure, repair the ability of reorganization network voluntarily, makes structure can realize monitoring to structure voluntarily again.Detailed process is as follows: the various sensing points 1 of having arranged on the structure, and when breakaway poing 2 sustains damage, to put 3 thereafter and lost efficacy, regional A area monitoring function is impaired.Can be by five in the area B intact sensor is reformulated the optical fiber sensing network to area B, repairs the monitoring function of breakaway poing 2, reaches the purpose that improves structural reliability.
Claims (2)
1. an optical fibre distribution type sensor network self-repairing system is characterized in that: be made up of fiber-optic grating sensor, selfreparing controller, fiber Bragg grating (FBG) demodulator, computing machine; Wherein fiber-optic grating sensor is connected with the selfreparing controller, the signal output part of selfreparing controller is connected with the signal input part of fiber Bragg grating (FBG) demodulator, the signal output part of fiber Bragg grating (FBG) demodulator is connected with the signal input part of computing machine, and the signal output part of computing machine is connected with the signal input part of selfreparing controller.
2. the self-repair method based on the described optical fibre distribution type sensor network self-repairing system of claim 1 is characterized in that comprising the steps:
The first step adopts the transducing signal after fiber-optic grating sensor collects optical-fiber intelligent material structure stand under load;
In second step, fiber-optic grating sensor sends to fiber Bragg grating (FBG) demodulator with the transducing signal of above-mentioned steps collection by the selfreparing controller;
The 3rd step, fiber Bragg grating (FBG) demodulator sends to computing machine after with sensing signal demodulation, computing machine adopts Light Wave Guide Theory modeling analysis method to calculate the allowable load of optical fiber intelligent structure and the load-bearing capacity of fibre system is handled transducing signal, stand under load situation to the optical-fiber intelligent material structure is judged, has judged whether that fiber-optic grating sensor lost efficacy;
The 4th step, when judged result for being, computing machine goes on foot described fail message with the 3rd and sends to the selfreparing controller; When being judged as not, then return the first step;
In the 5th step, the selfreparing controller judges to fail message that by the Granular Computing method concrete steps are:
A, utilize the relation of equivalence principle of rough set to form character attibute equivalence class and character grain pattern;
B, form number attribute equivalence class and digital grain pattern according to the relation of can not differentiating on the similarity;
C, form initial relation of equivalence, obtaining initial cluster result is the common factor of character particle collection relation of equivalence and number attribute particle collection relation of equivalence;
D, form final relation of equivalence, i.e. cluster result;
The 6th step, utilize Graph-theoretical Approach to carry out selfreparing to the localized network that lost efficacy, make that the density function expectation value of sensing point in structure on each root optical fiber all trends towards unanimity.
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| EP2166328A1 (en) * | 2008-09-22 | 2010-03-24 | Universita' degli studi di Bari | System for optical fiber strain measure |
| US9693707B2 (en) | 2011-01-28 | 2017-07-04 | Koninklijke Philips N.V. | Optical shape sensing fiber for tip and shape characterization of medical instruments |
| CN103873140B (en) * | 2014-03-17 | 2016-04-27 | 南京航空航天大学 | A kind of restorative procedure of the optical fiber sensing network based on ring topology |
| CN106998226B (en) * | 2017-03-22 | 2019-04-19 | 信阳师范学院 | Fiber Bragg grating sensor network intelligent health monitoring self-repairing system and method |
| CN110155366B (en) * | 2019-05-23 | 2023-01-24 | 兰州大学 | Self-sensing, identification and repair integrated method for intelligent optical fiber composite structure |
| CN111404758B (en) * | 2020-03-27 | 2022-04-19 | 桂林电子科技大学 | Rapid time-varying graph signal distributed repair method |
| CN113447061A (en) * | 2021-06-26 | 2021-09-28 | 山东航天电子技术研究所 | Micro sensing implantation type monitoring system and method for spacecraft composite material |
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