CN102706390A - Surface fiber Bragg grating sensor with double packaging layers and manufacturing method of surface fiber Bragg grating sensor - Google Patents
Surface fiber Bragg grating sensor with double packaging layers and manufacturing method of surface fiber Bragg grating sensor Download PDFInfo
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- CN102706390A CN102706390A CN2012100005947A CN201210000594A CN102706390A CN 102706390 A CN102706390 A CN 102706390A CN 2012100005947 A CN2012100005947 A CN 2012100005947A CN 201210000594 A CN201210000594 A CN 201210000594A CN 102706390 A CN102706390 A CN 102706390A
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Abstract
The invention provides a surface fiber Bragg grating sensor with double packaging layers and a manufacturing method of the surface fiber Bragg grating sensor. In the sensor, a first tail fiber is welded at one end of a fiber Bragg grating, a second tail fiber is welded at the other end of the fiber Bragg grating, a first sheath and a second sheath are respectively melted at two ends of a shell and used for reinforcing the connection strength of the first tail fiber, the second tail fiber and the shell, a first support sleeve and a second support sleeve are placed in grooves in the shell, the fiber Bragg grating is adhered on a grating support frame, the grating support frame is placed on the first support sleeve and the second support sleeve, two ends of the grating support frame are fixedly adhered in the shell, and the middle of the grating support frame is suspended so that requirements on monitoring surface strains of various structures are met. The manufacturing method includes that two ends of a steel wire adhered with the grating are fixed, and the middle of the steel wire is suspended, so that errors caused by transverse strain are effectively avoided, and influences to measurement results due to the transverse strain are effectively eliminated.
Description
Technical field
The present invention relates to surperficial adhesive type sensor, be specifically related to double-deck packaged fiber grating sensor of surface-type that is used for bridge health monitoring and preparation method thereof.
Background technology
The monitoring of the stress of civil engineering structure, strain and distortion needs various types of sensory devices.Civil engineering structure is related to the great structure of national economy often, guarantees that its healthy operation is of great importance.Relevant various parameters under the effect of carrying outside through various sensor measurement civil engineering structures; Distinguish the real work performance of structure from the actual destruction of intensity, rigidity, splitting resistance and structure form; Estimate structure bearing capacity; Confirm the matching degree of structure itself and its request for utilization, the performance of sensor for the accuracy of civil engineering structure Performance Evaluation by the decision meaning.
The sensor that with the Fiber Bragg Grating FBG is core is compared with traditional electronics and mechanical pick-up device, has highly sensitive, wide dynamic range, does not receive advantages such as electromagnetic interference (EMI), reliability is high, volume is little.The convenient realization to bridge, dam, aircraft, the naval vessel, the real-time monitoring of oil well etc., the application of fiber grating sensing technology is more and more widely.
The grating of fiber-optic grating sensor is scribed on the optical fiber, optical fiber be sensor be again transmission medium, can the grating of all sensor-based systems be integrated on the optical fiber, adopt flexile modulation sensing technology, the kind of measuring-signal is various.The signal vehicle of fiber-optic grating sensor is a laser, and the loss of in optical fiber, transmitting is extremely low, is suitable for long Distance Transmission and monitoring.Utilize the characteristic of fiber grating, the fiber-optic grating sensor that can process anti-adverse environment is used in the strong place of the inferior electromagnetic interference (EMI) of high voltage environment, and this moment, traditional sensors can't be competent at; Also can utilize the anti-interventionist of laser; Process accurate the distribution or distributed fiberoptic sensor; Structurally arrange in a large number, distortion or stress and so on physical quantities that it can not only the survey sensor place, and can learn the position simultaneously; Such optical fibre channel just can be measured structural parameters distribution roughly, monitors in real time.
Fiber-optic grating sensor is in the Application in Civil Engineering field: 1) temperature in the concrete maintenance and the monitoring of stress; 2) monitoring certainly and the self diagnosis in concrete mechanism crack; 3) monitoring certainly of xoncrete structure stress, strain and distortion; 4) reinforcing bar (rope) stress of xoncrete structure cooperation and the monitoring certainly of distortion.The structural parameters of works measurement monitoring is that Fibre Optical Sensor is used relatively extensive fields in above range of application.Mainly utilize fiber grating self measuring-signal characteristics; Use wavelength-division multiplex technique in an optical fiber, to be connected in series a plurality of Bragg gratings and carry out distributed capable high resolving power and large-range measuring; Obtain more careful structural parameters, the state of the local load of predict.
The size that the measurement of the temperature of the dependence measured point that the reliability of the measurement result of fiber grating is special is accurate and transverse strain influences.Especially in practical engineering application, the influence of fiber gratings such as temperature and transverse strain all can not ignore.Realize the through engineering approaches and the practicability of fiber-optic grating sensor, the stability of sensor and practicality must be paid close attention to.Grating is scribed on the spun glass, in Construction of Civil Engineering, is very easy to sustain damage.Tackle it during the fiber grating that therefore uses and carry out good encapsulation, the structure of encapsulation and pattern are easy to the installation at scene.Therefore, be badly in need of at present a kind ofly can guaranteeing fiber-optic grating sensor steady operation in actual measurement, relatively inexpensive again encapsulation and method for making.
Summary of the invention
The object of the present invention is to provide double-deck packaged fiber grating sensor of surface-type and preparation method thereof.The double-deck packaged fiber grating sensor of surface-type of the present invention can effectively be avoided the influence of transverse strain, and concrete technical scheme is following.
The double-deck packaged fiber grating sensor of surface-type; Comprise first tail optical fiber, second tail optical fiber, fiber grating, grating bracing frame, first sheath, second sheath and have the shell of groove; The said first tail optical fiber welding is at an end of fiber grating, and the said second tail optical fiber welding is at the other end of fiber grating; First sheath and second sheath burn respectively and melt at the shell two ends, are used to strengthen the strength of joint of said first tail optical fiber and second tail optical fiber and shell; Lay first support set and second support set in the groove in the shell; Fiber grating is bonded on the grating bracing frame; The grating bracing frame is placed on first support set and second support set, and grating bracing frame two ends cement and are fixed in the shell, and the center section of grating bracing frame then is in vacant state.
In the double-deck packaged fiber grating sensor of above-mentioned surface-type, said shell is made up of the two slip steel that have said groove, and grating bracing frame two ends are adopted epoxy resin to cement and are fixed on the two slip steel.
In the double-deck packaged fiber grating sensor of above-mentioned surface-type, said grating bracing frame is a high tensile steel wire.
In the double-deck packaged fiber grating sensor of above-mentioned surface-type, said fiber grating passes through epoxy bond to said high tensile steel wire.
In the double-deck packaged fiber grating sensor of above-mentioned surface-type, first tail optical fiber, second tail optical fiber all are with heat-shrink tube.
The present invention also provides the method for making of the double-deck packaged fiber grating sensor of a kind of surface-type, and it comprises the steps:
1) with heat-shrink tube on first tail optical fiber, second Pigtail sleeve;
2) intercepting fiber grating makes grating be positioned at the centre position;
3) first tail optical fiber, second tail optical fiber are fused to the naked fibre at said fiber grating two ends separately;
4) with the naked fibre that contains grating on the fiber grating with epoxy bond to the grating bracing frame;
5) burn and to melt first sheath and second sheath, make first sheath, second sheath be positioned at the end of said sensor outer housing, be used to strengthen the strength of joint of tail optical fiber and shell;
6) first support set and second support set are placed in the groove of shell; The grating bracing frame that is pasted with fiber grating is placed on first support set and second support set; Make two zones of welded joint between said sheath and outer casing end of fiber grating and said tail optical fiber, in this zone injection ring epoxy resins;
7) four bolts tightening on the two slip steel that constitute said shell are accomplished encapsulation.
The present invention makes the steel wire two ends that are pasted with grating fastening through simple and easy package design, and is middle unsettled, thereby effectively eliminated the influence of transverse strain to measurement result.The present invention and prior art relatively have following advantage:
1) method for making is simple and easy, and cost is reasonable.
2) check of process practical engineering application.The fiber-optic grating sensor design of surface adhesive type is easy to paste at surface of concrete structure, and is easy to weld in the steel component surface.Double-deck encapsulating structure can well protect sensor to resist extraneous invasion and attack.
3) this fiber-optic grating sensor stable performance can effectively be carried out the strain of civil engineering work and monitor.
4) be applicable to temperature and the monitoring of stress, strain and distortion on existing various large-sized reinforced concrete structures and steel construction surface, particularly to the strain monitoring of big-and-middle-sized concrete-bridge, steel box girder bridge.
Description of drawings
Fig. 1 is the double-deck packaged fiber grating sensor of the surface-type structural representation in the embodiment.
Fig. 2 is embodiment king-rod type fiber-optic grating sensor strain-centre wavelength figure.
Embodiment
Below in conjunction with accompanying drawing practical implementation of the present invention is described further, but enforcement of the present invention and protection domain are not limited thereto.
Like Fig. 1; The double-deck packaged fiber grating sensor of a kind of surface-type; Comprise first tail optical fiber 1, second tail optical fiber 8, fiber grating 6, grating bracing frame 3, first sheath 2, second sheath 9 and have the shell 5 of groove; 1 welding of said first tail optical fiber is at an end of fiber grating 6, and 8 weldings of said second tail optical fiber are at the other end of fiber grating 6; First sheath 2 and second sheath 9 burn respectively and melt at the shell two ends, are used to strengthen the strength of joint of said first tail optical fiber and second tail optical fiber and shell; Lay first support set 4 and second support set 7 in the groove in the shell; Fiber grating 6 is bonded on the grating bracing frame 3; Grating bracing frame 3 is placed on first support set 4 and second support set 7; Grating bracing frame 3 two ends cement and are fixed in the shell, and the center section of grating bracing frame 3 then is in vacant state.Said shell is made up of the two slip steel that have said groove, and grating bracing frame 3 two ends are adopted epoxy resin to cement and are fixed on the two slip steel.Said grating bracing frame 3 is a high tensile steel wire.Said fiber grating 6 passes through epoxy bond to said high tensile steel wire.First tail optical fiber 1, second tail optical fiber 8 all are with heat-shrink tube.
The method for making of the double-deck packaged fiber grating sensor of above-mentioned a kind of surface-type comprises the steps:
1) first tail optical fiber 1, second tail optical fiber 8 are put heat-shrink tube;
2) intercepting fiber grating makes grating be positioned at the centre position;
3) first tail optical fiber 1, second tail optical fiber 8 are fused to the naked fibre at said fiber grating two ends separately;
4) with the naked fibre that contains grating on the fiber grating with epoxy bond to the grating bracing frame;
5) burn and to melt first sheath 2 and second sheath 9, make first sheath 2, second sheath 9 be positioned at the end of said sensor outer housing, be used to strengthen the strength of joint of tail optical fiber and shell;
6) first support set 4 and second support set 7 are placed in the groove of shell; The grating bracing frame that is pasted with fiber grating is placed on first support set 4 and second support set 7; Make the zone (10,11) of two welded joints between said sheath and outer casing end of fiber grating and said tail optical fiber, in this zone injection ring epoxy resins;
7) four bolts 12 of tightening on the two slip steel of said shell are accomplished encapsulation.
In the present embodiment, the material of fiber-optic grating sensor is divided into: grating, outer encapsulation template, tackifier and auxiliary material.Wherein, for guaranteeing the well strain on transferring structure surface of surperficial adhesive type sensor, and satisfy the monitoring structural health conditions requirement, outer encapsulation template usability is superior to the steel of regular reinforcement; Can tackifier be taken all factors into consideration the adhesive property that whether is applicable to fiber grating and outer encapsulation template, whether has higher shearing strength and permanance, and help the factor such as carry out smoothly of encapsulation process and select epoxide-resin glue.
In the present embodiment, the force structure of surperficial adhesive type fiber-optic grating sensor by skin encapsulate template, bracing frame two parts are formed.Outer encapsulation template is the main member of sensor, and it is the bar shaped steel of two band grooves, and length is 150mm, and width is 15mm, the wide 3mm of groove, dark 1.5mm.Bracing frame is the high-tensile steel wires of a φ 2, and fiber grating is sticked on this root steel wire closely, makes supporting structure respectively at the two ends of grating section, makes this root steel wire be supported on outer Encapsulation Moulds intralamellar part.The steel wire two ends adopt epoxy resin to cement fixing.
The demarcation of fiber-optic grating sensor:
The method that experimental calibration adopts in the present embodiment is identical with the scaling method of reinforcing bar meter.Obtain corresponding strain-Prague centre wavelength relation, as shown in Figure 2.Divide Prague center wavelength variation that to find out sensor and the extraneous strain variation of being transmitted that good linear relationship is arranged.
Above content has been done sufficient explanation to the present invention, below lifts two example application again.
Application example 1 certain bridge Steel Continuous structure concrete surface strain monitoring, adopt the encapsulation of side's strip light fiber grating sensor shown in Figure 1:
1) carries out the making of sensor according to method of the present invention.
2) case beam surface concrete is cleaned out, sensor is bonded to case beam surface with epoxy resin.
3) tail optical fiber with sensor carries out series welding, obtains the distributed strain monitoring system.
Application example 2 certain steel box girder bridge case beam surface strain monitoring, adopt the encapsulation of side's strip light fiber grating sensor shown in Figure 1:
1) carries out the making of sensor according to method of the present invention.
2) steel case joist steel plate surface rust protection paint is removed totally, sensor is bonded to case beam surface, treat to coat with lacquer at steel case beam and sensor surface rust prevention by applying liquid material after the epoxy with epoxy resin.
3) tail optical fiber with sensor carries out series welding, obtains the distributed strain monitoring system.
Claims (6)
1. the double-deck packaged fiber grating sensor of surface-type; The shell that it is characterized in that comprising first tail optical fiber, second tail optical fiber, fiber grating, grating bracing frame, first sheath, second sheath and have groove; The said first tail optical fiber welding is at an end of fiber grating, and the said second tail optical fiber welding is at the other end of fiber grating; First sheath and second sheath burn respectively and melt at the shell two ends, are used to strengthen the strength of joint of said first tail optical fiber and second tail optical fiber and shell; Lay first support set and second support set in the groove in the shell; Fiber grating is bonded on the grating bracing frame; The grating bracing frame is placed on first support set and second support set, and grating bracing frame two ends cement and are fixed in the shell, and the center section of grating bracing frame then is in vacant state.
2. the double-deck packaged fiber grating sensor of surface-type according to claim 1 is characterized in that said shell is made up of the two slip steel that have said groove, and grating bracing frame two ends are adopted epoxy resin to cement and are fixed on the two slip steel.
3. the double-deck packaged fiber grating sensor of surface-type according to claim 1 is characterized in that said grating bracing frame is a high tensile steel wire.
4. the double-deck packaged fiber grating sensor of surface-type according to claim 3 is characterized in that said fiber grating passes through epoxy bond to said high tensile steel wire.
5. the double-deck packaged fiber grating sensor of surface-type according to claim 3 is characterized in that first tail optical fiber, second tail optical fiber all are with heat-shrink tube.
6. the method for making of the double-deck packaged fiber grating sensor of surface-type is characterized in that comprising the steps:
1) with heat-shrink tube on first tail optical fiber, second Pigtail sleeve;
2) intercepting fiber grating makes grating be positioned at the centre position;
3) first tail optical fiber, second tail optical fiber are fused to the naked fibre at said fiber grating two ends separately;
4) with the naked fibre that contains grating on the fiber grating with epoxy bond to the grating bracing frame;
5) burn and to melt first sheath and second sheath, make first sheath, second sheath be positioned at the end of said sensor outer housing, be used to strengthen the strength of joint of tail optical fiber and shell;
6) first support set and second support set are placed in the groove of shell; The grating bracing frame that is pasted with fiber grating is placed on first support set and second support set; Make two zones of welded joint between said sheath and outer casing end of fiber grating and said tail optical fiber, in this zone injection ring epoxy resins;
7) four bolts tightening on the two slip steel of said shell are accomplished encapsulation.
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| CN2012100005947A CN102706390A (en) | 2012-01-04 | 2012-01-04 | Surface fiber Bragg grating sensor with double packaging layers and manufacturing method of surface fiber Bragg grating sensor |
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| CN2012100005947A CN102706390A (en) | 2012-01-04 | 2012-01-04 | Surface fiber Bragg grating sensor with double packaging layers and manufacturing method of surface fiber Bragg grating sensor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103277387A (en) * | 2013-05-17 | 2013-09-04 | 中国航空工业集团公司北京长城计量测试技术研究所 | Intelligent bolt for optical fiber grating sensor |
| CN103411713A (en) * | 2013-07-11 | 2013-11-27 | 中交四航工程研究院有限公司 | Large range reinforcing steel corrosion monitoring sensor based on fiber bragg grating sensing technology |
| CN104677302A (en) * | 2015-03-24 | 2015-06-03 | 北京航空航天大学 | Three-dimensional sensor based on fiber bragg grating and sensor main body of three-dimensional sensor |
| CN105043281A (en) * | 2015-05-12 | 2015-11-11 | 东北电力大学 | Fiber grating strain sensor and manufacturing method and forming die thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103277387A (en) * | 2013-05-17 | 2013-09-04 | 中国航空工业集团公司北京长城计量测试技术研究所 | Intelligent bolt for optical fiber grating sensor |
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| CN103411713B (en) * | 2013-07-11 | 2015-12-02 | 中交四航工程研究院有限公司 | Wide range is based on the reinforcing steel corrosion monitoring sensor of fiber grating sensing technology |
| CN104677302A (en) * | 2015-03-24 | 2015-06-03 | 北京航空航天大学 | Three-dimensional sensor based on fiber bragg grating and sensor main body of three-dimensional sensor |
| CN104677302B (en) * | 2015-03-24 | 2017-11-24 | 北京航空航天大学 | A kind of three-dimension sensor and its sensor main body based on fiber grating |
| CN105043281A (en) * | 2015-05-12 | 2015-11-11 | 东北电力大学 | Fiber grating strain sensor and manufacturing method and forming die thereof |
| CN105043281B (en) * | 2015-05-12 | 2017-09-05 | 东北电力大学 | A kind of fiber Bragg grating strain sensor and preparation method thereof and mould |
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Application publication date: 20121003 |