CN104729421A - Distributed sensing optical fiber device capable of monitoring basic level crack and monitoring method thereof - Google Patents
Distributed sensing optical fiber device capable of monitoring basic level crack and monitoring method thereof Download PDFInfo
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Abstract
The invention discloses a distributed sensing optical fiber device capable of monitoring a basic level crack, and relates to the technical field of optical fiber sensing and basic level crack monitoring. The distributed sensing optical fiber device is characterized in that a sensing optical fiber is arranged in the inner portion of a basic level in the longitudinal and transverse directions of the basic level in an embedded mode, by means of a Brillouin optical time domain analysis distributed optical fiber sensing (BOTDA) method, the correlation is demarcated between pavement basic level shrink and optical fiber sensing dependent variable, and the position and a development law of the crack which is located in the transverse direction of the basic level are monitored. According to the distributed sensing optical fiber device, the appearing position and the development law of the basic level crack can be convenient to monitor, suggestions are provided for the maintenance of the basic level, and reliable foundation is provided for the maintenance in a fixed point after a pavement is built.
Description
Technical field
The invention belongs to roadbase engineering monitoring technical field, particularly relate to a kind of distributed sensing fiber device and the monitoring method thereof that can monitor basic crack.
Background technology
The vehicular load transmitted by surface layer mainly bears in basic unit, and by load assignment on bed course or soil matrix, the plate body of basic unit, stability, globality ensure that the serviceable life on road surface.But basic unit is in forming process, easily because of the transverse crack of base material dehydration shrinkage formation rule, produce warm plastic forming because of temperature variation.Crack reflection is to surface layer, and road table water enters surface layer, produces flowing pressure, destroy the coupled situation between surface layer and basic unit under the effect of traffic load, the destruction of aggravation surface layer.Road table water also can infiltrate basic unit and roadbed by basic crack, under the effect of traffic load, damages basic unit and roadbed, produces purt mud, disease such as hole groove, depression etc., the serviceable life of serious curtailment road.Therefore, the monitoring of roadbase and Study on Crack Resistance are significant.
The detection technique of current road structure routine mainly contains manual inspection technology, core boring sampling technology, ultrasonic technology, infrared image technology, spectrum analysis technique, Radar Technology etc., but they all rest on detection technique aspect, and detection time and cycle length, Real-Time Monitoring poor performance, precision are low.Optical fiber sensing technology, because having the advantages such as electromagnetism interference, corrosion-resistant, high sensitivity, absolute measurement, obtains application at engineering fields such as building, traffic, oceans.At present, the research of Fibre Optical Sensor is concentrated on mostly to the application of fiber grating sensing technology, but fiber-optic grating sensor can not meet the requirement that the long Distance geometry full size of road is measured, and cannot carry out real-time measurement and monitoring.
Distribution type fiber-optic Brillouin sensing technology has the continuous monitoring realized on a general single mode fiber on optical fiber stress field along the line and temperature field Time and place, and monitoring distance can reach 100km, can realize remote measurement and monitoring in real time to basic unit.The present invention utilizes Brillouin light time domain distributing optical fiber sensing (BOTDA) method, and by demarcating the correlativity of base-layer contraction deflection and Fibre Optical Sensor dependent variable, monitoring basic unit's transverse crack position and the rule of development, carry out the monitoring of full size to roadbase.
Summary of the invention
Technical matters to be solved by this invention is for the above-mentioned state of the art, and provides a kind of and grow distance, super distributed, real-time carry out measurement and monitoring distributed sensing fiber device and monitoring method thereof to roadbase crack.
The present invention solves the problems of the technologies described above adopted technical scheme:
A kind of distributed sensing fiber device monitoring basic crack, wherein: comprise the sensor fibre being embedded in basic unit inside, sensor fibre is bent to multilayer and lays, Brillouin light time domain distributed fiberoptic sensor is accessed in the middle part of sensor fibre, Brillouin light time domain distributed fiberoptic sensor is monitored in real time to the temperature of each section of sensor fibre and strain, sensor fibre one end connects the pulse laser emission device of injected pulse light, the other end connects the continuous laser transmitter injecting continuous light, every layer of sensing fiber section be all corresponding is provided with at least one temperature sensor for temperature compensation, temperature sensor, Brillouin light time domain distributed fiberoptic sensor is all connected with control device, the data analysis that control device transmits temperature sensor and Brillouin light time domain distributed fiberoptic sensor.
For optimizing technique scheme, the concrete measure taked also comprises:
Above-mentioned temperature sensor is resistance temperature detector.
Above-mentioned sensor fibre is the bending of vertical multilayer, and the bearing of trend of sensor fibre is along basic unit's spreading direction.
Breaking in the middle part of above-mentioned sensor fibre is two ports, and these two ports are connected in series formation loop with two interfaces of Brillouin light time domain distributed fiberoptic sensor respectively.
Above-mentioned control device is computing machine.
Above-mentioned temperature sensor is arranged on sensor fibre end position place.
A method for distributed sensing fiber device monitoring basic crack, comprises the following steps:
In basic unit, bury sensor fibre underground when step one, laying basic unit, sensor fibre extends along spreading direction, and sensor fibre multistage bends, and makes its each section to be in the different-thickness layer of basic unit, buries temperature sensor underground simultaneously;
Step 2, the port of two in the middle part of sensor fibre is imported and exported wire jumper with Brillouin light time domain distributed fiberoptic sensor be respectively connected in series, at sensor fibre two ends, pulse laser emission device and continuous laser transmitter are installed;
Step 3, carry out light path check, gating pulse generating laser and continuous laser transmitter Emission Lasers, detect Brillouin light time domain distributed fiberoptic sensor and whether can receive signal, as can not signal be received, overhaul, if receive signal, carry out next step;
Step 4, to keep after path when circuit, pulse laser emission device transponder pulse light, continuous light launched by continuous laser transmitter, the light signal received is carried out demodulation according to the method for Brillouin optical time domain analysis by Brillouin light time domain distributed fiberoptic sensor, obtains temperature and the Strain Distribution formula signal of whole piece sensor fibre; Because sensor fibre is embedded in diverse location place of basic unit, temperature and the strain curve of basic unit's diverse location therefore can be obtained;
Temperature after demodulation and Strain Distribution formula signal are reached control device by step 5, Brillouin light time domain distributed fiberoptic sensor, control device substitutes into temperature according to the temperature value that temperature sensor transmits and Strain Distribution formula signal carries out temperature compensation, obtain Strain Distribution formula signal, obtain basic unit's diverse location place strain value, and then draw basic unit's diverse location place drawdown deformation amount;
Step 6, in real time monitoring Strain Distribution formula signal, know the rule of development of basic unit's diverse location place drawdown deformation amount.
Compared with prior art, the invention has the beneficial effects as follows, apply this distributed sensing fiber monitoring basic crack, long distance, super distributed, the appearance of high-acruracy survey basic crack and development can be realized, and can realize the real-time of road structure and long term monitoring, effectively can instruct the maintenance of basic unit, the repairing after road completes, avoid larger loss.
Accompanying drawing explanation
Fig. 1 is basic crack monitoring section schematic diagram of the present invention;
Fig. 2 is monitoring optical fiber floor plan of the present invention;
Fig. 3 is assay method FB(flow block) of the present invention.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention example is described in further detail.
Fig. 1 is to Figure 3 shows that structural representation of the present invention.
Reference numeral is wherein: temperature sensor 1, control device 2, sensor fibre 3, Brillouin light time domain distributed fiberoptic sensor 4.
As shown in Figure 1 to Figure 3, a kind of distributed sensing fiber device monitoring basic crack of the present invention, wherein: comprise the sensor fibre 3 being embedded in basic unit inside, sensor fibre 3 is bent to multilayer and lays, Brillouin light time domain distributed fiberoptic sensor 4 is accessed in the middle part of sensor fibre 3, Brillouin light time domain distributed fiberoptic sensor 4 is monitored in real time to the temperature of each section of sensor fibre 3 and strain, sensor fibre 3 one end connects the pulse laser emission device of injected pulse light, the other end connects the continuous laser transmitter injecting continuous light, every layer of sensor fibre 3 part be all corresponding is provided with at least one temperature sensor 1 for temperature compensation, temperature sensor 1, Brillouin light time domain distributed fiberoptic sensor 4 is all connected with control device 2, the data analysis that control device 2 pairs of temperature sensors 1 and Brillouin light time domain distributed fiberoptic sensor 4 transmit.
In embodiment, temperature sensor 1, in one end basic unit being embedded in sensor fibre, independently gathers.
In embodiment, temperature sensor 1 is resistance temperature detector.
In embodiment, sensor fibre 3 is the bending of vertical multilayer, and the bearing of trend of sensor fibre 3 is along basic unit's spreading direction.
In embodiment, breaking in the middle part of sensor fibre 3 is two ports, and these two ports are connected in series formation loop with two interfaces of Brillouin light time domain distributed fiberoptic sensor 4 respectively.
In embodiment, control device 2 is computing machine.
In embodiment, temperature sensor 1 is arranged on sensor fibre 3 end position place.
A method for distributed sensing fiber device monitoring basic crack, comprises the following steps:
In basic unit, bury sensor fibre 3 underground when step one, laying basic unit, sensor fibre 3 prolongs spreading direction along basic unit and extends, and sensor fibre 3 multistage bends, and makes its each section to be in the different-thickness layer of basic unit, buries temperature sensor 1 simultaneously underground;
Step 2, the port of two in the middle part of sensor fibre 3 is imported and exported wire jumper with Brillouin light time domain distributed fiberoptic sensor 4 be respectively connected in series, at sensor fibre 3 two ends, pulse laser emission device and continuous laser transmitter are installed;
Step 3, carry out light path check, gating pulse generating laser and continuous laser transmitter Emission Lasers, detect Brillouin light time domain distributed fiberoptic sensor 4 and whether can receive signal, as can not signal be received, overhaul, if receive signal, carry out next step;
Step 4, to keep after path when circuit, pulse laser emission device transponder pulse light, continuous light launched by continuous laser transmitter, the light signal received is carried out demodulation according to the method for Brillouin optical time domain analysis by Brillouin light time domain distributed fiberoptic sensor 4, obtains temperature and the Strain Distribution formula signal of whole piece sensor fibre; Because sensor fibre is embedded in diverse location place of basic unit, temperature and the strain curve of basic unit's diverse location therefore can be obtained;
Temperature after demodulation and Strain Distribution formula signal are reached control device 2 by step 5, Brillouin light time domain distributed fiberoptic sensor 4, control device 2 substitutes into temperature according to the temperature value that temperature sensor 1 transmits and Strain Distribution formula signal carries out temperature compensation, obtain Strain Distribution formula signal, obtain basic unit's diverse location place strain value, and then draw basic unit's diverse location place drawdown deformation amount;
Step 6, in real time monitoring Strain Distribution formula signal, know the rule of development of basic unit's diverse location place drawdown deformation amount.
Distributed sensing fiber 3 monitors roadbed cracks technique and method, and it is made up of parts such as temperature sensor 1, distributed fiberoptic sensor, generating laser, Brillouin's backscattering data acquisition equipment, Brillouin's backscattering data demodulates equipment, corresponding computer analysis software.
When base layer construction, divided by Fibre Optical Sensor three layers to be embedded in basic unit, subbase and basic unit's surface of contact one deck, one deck between two-layer basic unit, one deck is laid in upper basic unit and face layer contacts face, meanwhile, divides three layers and bury temperature sensor 1 underground in basic unit.
Generating laser launches a branch of pulsed light and a branch of continuous light from the two ends of Fibre Optical Sensor respectively, the Brillouin back scattering luminous power that the measurement of Brillouin's backscattering data acquisition equipment receives, Brillouin's backscattering data demodulates equipment completes measurement and the positioning function of the Brillouin shift of each point on sensor fibre 3.According to Brillouin shift and the linear dependence between strain and temperature, Strain Distribution and temperature that sensor fibre 3 lays layer along the line can be obtained.Carry out temperature compensation, the Strain Distribution that sensor fibre 3 lays layer can be obtained, and then the rule of the position that crack occurs and development can be drawn.
The GPIB communication interface utilizing Brillouin light time domain distributing optical fiber sensing (BOTDA) method to provide and network interface connect computing machine, can hand-guided also can the duty of computing machine control BOTDA, realize data sampling and the process of robotization.Data file after dissection process by the communications interface transmission of BOTDA in computing machine, can also carry out analysis and calculation by data analysis software to these data files.
Brillouin optical time domain analysis technology refers to, when the frequency difference of two laser is equal with Brillouin shift fB, weak laser signal amplifies by strong laser signal, is referred to as Brillouin and is excited amplification, between two light beams, energy trasfer occurs.BOTDA technology just applies this principle, and adopt two light sources respectively as laser pulse light and detection continuous light, its detectable signal can be brillouin gain signal, also can be Brillouin's loss signal.According to BOTDA principle of work, when meeting f1-f2=fB, pulsed light energy is transferred to continuous light, obtains brillouin gain signal, and namely continuous light energy increases; And when meeting f1-f2=-fB, pulsed light is exaggerated, continuous light is decayed, and what obtain is Brillouin's deamplification.When strain occurs certain part of optical fiber, the Brillouin shift of there just becomes fC from fB, and result causes this part BOTDA signal attenuation.Tuning incident laser and the frequency difference detected between light of making equals fC, just can receive the brillouin scattering signal of this point.Due to Brillouin shift and temperature, strain and there is linear relationship, therefore while carrying out the frequency of two-laser regulating continuously, by detection fiber coupled one end continuous light power out, difference on the frequency corresponding when just can determine that on optical fiber each segment region, energy trasfer reaches maximum, thus obtain temperature strain information, realize distributed measurement.
Below be only the preferred embodiment of the present invention, protection scope of the present invention be not only confined to above-described embodiment, all technical schemes belonged under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, should be considered as protection scope of the present invention.
Claims (7)
1. can monitor the distributed sensing fiber device of basic crack for one kind, it is characterized in that: comprise the sensor fibre (3) being embedded in basic unit inside, described sensor fibre (3) is bent to multilayer and lays, sensor fibre (3) middle part access Brillouin light time domain distributed fiberoptic sensor (4), Brillouin light time domain distributed fiberoptic sensor (4) is monitored in real time to the temperature of each section of sensor fibre (3) and strain, described sensor fibre (3) one end connects the pulse laser emission device of injected pulse light, the other end connects the continuous laser transmitter injecting continuous light, sensor fibre (3) part described in every layer is all corresponding is provided with at least one temperature sensor for temperature compensation (1), described temperature sensor (1), Brillouin light time domain distributed fiberoptic sensor (4) is all connected with control device (2), the data analysis that described control device (2) transmits temperature sensor (1) and Brillouin light time domain distributed fiberoptic sensor (4).
2. a kind of distributed sensing fiber device monitoring basic crack according to claim 1, is characterized in that: described temperature sensor (1) is resistance temperature detector.
3. a kind of distributed sensing fiber device monitoring basic crack according to claim 2, it is characterized in that: described sensor fibre (3) bends for vertical multilayer, and the bearing of trend of sensor fibre (3) is along basic unit's spreading direction.
4. a kind of distributed sensing fiber device monitoring basic crack according to claim 3, it is characterized in that: breaking in the middle part of sensor fibre (3) is two ports, and these two ports are connected in series formation loop with two interfaces of Brillouin light time domain distributed fiberoptic sensor (4) respectively.
5. a kind of distributed sensing fiber device monitoring basic crack according to claim 4, is characterized in that: described control device (2) is computing machine.
6. a kind of distributed sensing fiber device monitoring basic crack according to claim 5, is characterized in that: described temperature sensor (1) is arranged on sensor fibre (3) end position place.
7. a method for distributed sensing fiber device monitoring basic crack as claimed in claim 6, is characterized in that: comprise the following steps:
In basic unit, sensor fibre (3) is buried underground when step one, laying basic unit, sensor fibre (3) extends along spreading direction, sensor fibre (3) multistage bends, and makes its each section to be in the different-thickness layer of basic unit, buries temperature sensor (1) simultaneously underground;
Step 2, two ports at sensor fibre (3) middle part are imported and exported wire jumper with Brillouin light time domain distributed fiberoptic sensor (4) respectively and are connected in series, at sensor fibre (3) two ends installation pulse laser emission device and continuous laser transmitter;
Step 3, carry out light path check, gating pulse generating laser and continuous laser transmitter Emission Lasers, detect Brillouin light time domain distributed fiberoptic sensor (4) and whether can receive signal, as can not signal be received, overhaul, if receive signal, carry out next step;
Step 4, to keep after path when circuit, pulse laser emission device transponder pulse light, continuous light launched by continuous laser transmitter, the light signal received is carried out demodulation according to the method for Brillouin optical time domain analysis by Brillouin light time domain distributed fiberoptic sensor (4), obtains temperature and the Strain Distribution formula signal of whole piece sensor fibre; Because sensor fibre is embedded in diverse location place of basic unit, temperature and the strain curve of basic unit's diverse location therefore can be obtained;
Temperature after demodulation and Strain Distribution formula signal are reached control device (2) by step 5, Brillouin light time domain distributed fiberoptic sensor (4), control device (2) substitutes into temperature according to the temperature value that temperature sensor (1) transmits and Strain Distribution formula signal carries out temperature compensation, obtain Strain Distribution formula signal, obtain basic unit's diverse location place strain value, and then draw basic unit's diverse location place drawdown deformation amount;
Step 6, in real time monitoring Strain Distribution formula signal, know the rule of development of basic unit's diverse location place drawdown deformation amount.
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| CN105572330A (en) * | 2015-12-08 | 2016-05-11 | 南京航空航天大学 | Smart monitoring device and method of shrinkage coefficient and temperature shrinkage coefficient of cement stabilized macadam |
| CN106168509A (en) * | 2016-07-29 | 2016-11-30 | 上海市政工程设计研究总院（集团）有限公司 | Bituminous paving temperature based on Distributed Optical Fiber Sensing Techniques monitoring system |
| CN106290377A (en) * | 2016-07-29 | 2017-01-04 | 长安大学 | A kind of Bridge Crack Monitoring early warning system and method for early warning |
| CN106764454A (en) * | 2017-01-25 | 2017-05-31 | 山西科达自控股份有限公司 | Distribution type fiber-optic band and distributing optical fiber sensing pipe network monitoring device |
| CN107289864A (en) * | 2017-05-23 | 2017-10-24 | 上海市政工程设计研究总院（集团）有限公司 | Based on the micro-bend concrete plate beam hinge joint damage detection method of distribution type fiber-optic |
| CN108277728A (en) * | 2018-01-04 | 2018-07-13 | 中国恩菲工程技术有限公司 | Road deck Defect inspection method and system |
| CN110207604A (en) * | 2019-05-15 | 2019-09-06 | 广东博智林机器人有限公司 | Cave in monitoring system, method and device |
| CN110672657A (en) * | 2019-10-22 | 2020-01-10 | 四川大学 | Temperature tracing system and monitoring method for monitoring concrete structure crack |
| CN111982365A (en) * | 2020-08-25 | 2020-11-24 | 南京法艾博光电科技有限公司 | Novel plantar pressure monitoring system and method based on distributed optical fiber sensing |
| CN112525073A (en) * | 2020-11-19 | 2021-03-19 | 哈尔滨工业大学 | Concrete crack position and width identification method based on Brillouin gain spectrum |
| CN113280863A (en) * | 2021-06-07 | 2021-08-20 | 兰州大学 | Comprehensive observation method for temperature and strain of roadbed water stabilization layer based on embedded optical fiber |
| CN113702440A (en) * | 2021-09-13 | 2021-11-26 | 南京大学 | Method for monitoring growth state of internal cracks of soil body |
| CN114295264A (en) * | 2021-12-31 | 2022-04-08 | 兰州大学 | Fiber grating sensing monitoring method for three-dimensional load transfer rule of multilayer medium structure |
| CN114812424A (en) * | 2022-05-13 | 2022-07-29 | 天津大学 | Visual safety monitoring system and method for ice layer of natural ice rink |
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| CN105572330A (en) * | 2015-12-08 | 2016-05-11 | 南京航空航天大学 | Smart monitoring device and method of shrinkage coefficient and temperature shrinkage coefficient of cement stabilized macadam |
| CN106168509A (en) * | 2016-07-29 | 2016-11-30 | 上海市政工程设计研究总院（集团）有限公司 | Bituminous paving temperature based on Distributed Optical Fiber Sensing Techniques monitoring system |
| CN106290377A (en) * | 2016-07-29 | 2017-01-04 | 长安大学 | A kind of Bridge Crack Monitoring early warning system and method for early warning |
| CN106764454A (en) * | 2017-01-25 | 2017-05-31 | 山西科达自控股份有限公司 | Distribution type fiber-optic band and distributing optical fiber sensing pipe network monitoring device |
| CN107289864A (en) * | 2017-05-23 | 2017-10-24 | 上海市政工程设计研究总院（集团）有限公司 | Based on the micro-bend concrete plate beam hinge joint damage detection method of distribution type fiber-optic |
| CN108277728B (en) * | 2018-01-04 | 2023-06-23 | 中国恩菲工程技术有限公司 | Road surface layer disease detection method and system |
| CN108277728A (en) * | 2018-01-04 | 2018-07-13 | 中国恩菲工程技术有限公司 | Road deck Defect inspection method and system |
| CN110207604A (en) * | 2019-05-15 | 2019-09-06 | 广东博智林机器人有限公司 | Cave in monitoring system, method and device |
| CN110672657A (en) * | 2019-10-22 | 2020-01-10 | 四川大学 | Temperature tracing system and monitoring method for monitoring concrete structure crack |
| CN111982365A (en) * | 2020-08-25 | 2020-11-24 | 南京法艾博光电科技有限公司 | Novel plantar pressure monitoring system and method based on distributed optical fiber sensing |
| CN112525073B (en) * | 2020-11-19 | 2022-06-03 | 哈尔滨工业大学 | Structural crack identification method based on Brillouin gain spectrum characteristic parameters |
| CN112525073A (en) * | 2020-11-19 | 2021-03-19 | 哈尔滨工业大学 | Concrete crack position and width identification method based on Brillouin gain spectrum |
| CN113280863A (en) * | 2021-06-07 | 2021-08-20 | 兰州大学 | Comprehensive observation method for temperature and strain of roadbed water stabilization layer based on embedded optical fiber |
| CN113702440A (en) * | 2021-09-13 | 2021-11-26 | 南京大学 | Method for monitoring growth state of internal cracks of soil body |
| CN114295264A (en) * | 2021-12-31 | 2022-04-08 | 兰州大学 | Fiber grating sensing monitoring method for three-dimensional load transfer rule of multilayer medium structure |
| CN114295264B (en) * | 2021-12-31 | 2022-09-06 | 兰州大学 | Fiber grating sensing monitoring method for three-dimensional load transfer rule of multilayer medium structure |
| CN114812424A (en) * | 2022-05-13 | 2022-07-29 | 天津大学 | Visual safety monitoring system and method for ice layer of natural ice rink |
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