CN103217109B - A kind of Crack Monitoring sensor based on OTDR technique and using method thereof - Google Patents
A kind of Crack Monitoring sensor based on OTDR technique and using method thereof Download PDFInfo
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- CN103217109B CN103217109B CN201310122222.6A CN201310122222A CN103217109B CN 103217109 B CN103217109 B CN 103217109B CN 201310122222 A CN201310122222 A CN 201310122222A CN 103217109 B CN103217109 B CN 103217109B
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- optical fiber
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- bare fibre
- protecting box
- concrete
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Abstract
A kind of Crack Monitoring sensor based on OTDR technique and using method thereof, belong to fiber optic monitoring technology field, including protecting box, with the bare fibre coil of two terminations and first, second matcoveredn optical fiber；Described bare fibre coil is that one section of bare wire optical fiber is by the fiber optic coils formed after tangled up and knotted, and this bare fibre coil diameter is between 14mm 16mm, first by sensor external optical fiber and first during use, second matcoveredn optical fiber passes through termination welding, the adhesion effect of epoxide-resin glue is released again with degumming agent, ensure that sensor internal optical fiber freely can stretch along with the extension in crack, then proceed to casting concrete, the present invention not only easy construction, make simple, with low cost, and can be suitably used for the Crack Monitoring of various concrete inner structure, simultaneously operable property is strong, it is capable of monitoring and the distributed monitoring in real time of concrete inner structure.
Description
Technical field
The present invention relates to a kind of Crack Monitoring sensor based on OTDR technique and using method thereof, belong to fiber-optic monitoring skill
Art field.
Background technology
Fiber-optic monitoring concrete structure crack is that when concrete cracking, optical fiber is subject to by burying optical fiber in concrete underground
To bending, its bending radius, less than after macrobending critical radius, will produce Fresnel reflection and Rayleigh scattering, and optical time domain is anti-
Penetrate instrument and can monitor light loss now.The macrobending radius of the i.e. optical fiber of fiber optic coils radius constantly reduces, and the number reduced
Value becomes certain relation with the opening degree of distress in concrete.The most just can get inside light loss and xoncrete structure, external crack
Relation between aperture, judges damages of concrete structures degree with this.Traditional Fibre Optical Sensor has respective limitation, has
Can be only applied to body structure surface, some operability are strong not, can only carry out point type monitoring, some poor anti jamming capability, have
Cost is high, operation complexity.
Summary of the invention
The present invention is directed to the deficiency of the problems referred to above, propose a kind of can effectively monitor distress in concrete produce with extend split
Seam monitor, this technology not only capacity of resisting disturbance is strong, with low cost, it is simple to make, and can apply to inside xoncrete structure,
Simultaneously operable property is strong, it is possible to realize monitoring and distributed monitoring in real time.
The present invention solves that the technical scheme that above-mentioned technical problem proposes is: a kind of Crack Monitoring based on OTDR technique passes
Sensor, including protecting box, with the bare fibre coil of two terminations and first, second matcoveredn optical fiber, described bare fibre
Coil is arranged in protecting box, and the two ends, bottom of described protecting box are respectively arranged with first, second line outlet, and first,
It is respectively arranged with first, second optical fiber bottom protecting box below two line outlets and pastes platform；Described first matcoveredn optical fiber
One end be connected through the first line outlet in protecting box with a termination of bare fibre coil, and this first matcoveredn light
The fine other end is pasted onto the first optical fiber by epoxide-resin glue and pastes on platform；And one end of the second matcoveredn optical fiber passes
The second line outlet in protecting box is connected with another termination of bare fibre coil, and another of this second matcoveredn optical fiber
Hold and be pasted onto on the second optical fiber stickup platform by epoxide-resin glue；Described bare fibre coil is that one section of bare wire optical fiber is by being wound around
The fiber optic coils formed after knotting, and this bare fibre coil diameter is between 14mm-16mm.
Further: described protecting box inwall is provided with anti-reflective layer, the most described protecting box is corrosion-resistant, resistant to elevated temperatures
The metal coating box that metal material is made.
Preferred: described bare fibre coil diameter is 15mm.
A kind of using method based on Crack Monitoring sensor based on OTDR technique described above, including following step
Rapid: when a. is by concreting to height to be monitored, screeding concrete surface, by external fiber or the skin cable of monitoring instrument
Tighten and be laid in concrete surface, more described sensor is lain in concrete surface, then external fiber or skin cable are divided
The termination welding of first, second matcoveredn optical fiber not and on described sensor；B. continue on external fiber or skin cable
Continuous concrete of laying makes external fiber or skin cable maintain static, by the time after concrete setting, and will with epoxy resin degumming agent
First, second optical fiber is pasted the epoxide-resin glue on platform and is removed, and then proceedes to casting concrete.
Further: in described a step, described external fiber or skin cable on described sensor first,
After the termination welding of the second matcoveredn optical fiber, use at welding position heat-shrink tube to protect, be cased with not outside heat-shrink tube
Rust steel steel pipe.
The Crack Monitoring sensor based on OTDR technique of the present invention and using method thereof, compared to existing technology, have with
Lower beneficial effect: 1. due to use optical fiber as main body, therefore its be not only simple in structure, with low cost, and by electromagnetism do
Disturb, temperature little on its impact, thus capacity of resisting disturbance is strong, highly sensitive, and its life-span length, durability be good, easy for installation simultaneously, system
Make technique simple.2. owing to only needing first sensor external optical fiber and first, second matcoveredn optical fiber to be passed through termination when using
Welding, then the adhesion effect of epoxide-resin glue is released with degumming agent, then proceed to casting concrete, thus it uses simple side
Just, workable, simultaneously because be provided with protecting box, thus degree of safety own is high, is difficult to damaged, is applicable to various mixed
The Crack Monitoring of Xtah Crude Clay structure.3., owing to using bare fibre coil as main body, therefore optical time domain reflectometer is by this bare fibre
Concrete can be constantly monitored by coil, it is achieved the dynamic monitoring of concrete structure crack (monitoring in real time), simultaneously by
Simple in present configuration, workable, therefore can carry out multiple spot layout, thus realize the distribution of concrete inner structure
Formula is monitored, and this has breakthrough meaning for the Crack Monitoring of mass concrete.
Accompanying drawing illustrates:
Fig. 1 is the structural representation of present invention Crack Monitoring based on OTDR technique sensor；
Fig. 2 is the floor map of present invention Crack Monitoring based on OTDR technique sensor；
Fig. 3 is the formation mechenism schematic diagram of bare fibre coil (2)
In figure: 1 protecting box, 2 bare fibre coils, 31 first matcoveredn optical fiber, 32 second matcoveredn light
Fibre, 41 first viscose glue positions, 42 second viscose glue positions, 5 fibre-optical splice 61 first line outlets, 62 second outlets
Mouthful, platform pasted by 71 first optical fiber, and platform pasted by 72 second optical fiber.
Detailed description of the invention:
Accompanying drawing discloses the structural representation of a preferred embodiment of the invention without limitation, detailed below with reference to accompanying drawing
Technical scheme carefully is described.
Embodiment
A kind of Crack Monitoring sensor based on OTDR technique, as shown in Figure 1, 2, including protecting box, with two terminations
Bare fibre coil and first, second matcoveredn optical fiber, described bare fibre coil is arranged in protecting box, described bare fibre
Coil is pasted onto in protecting box by epoxide-resin glue, and the two ends, bottom of described protecting box are respectively arranged with first, second outlet
Mouthful, described first, second line outlet is used for drawing first, second matcoveredn optical fiber, and below first, second line outlet
It is respectively arranged with first, second optical fiber bottom protecting box and pastes platform；Owing to bare fibre is easily broken off, so inside protecting box
By bare fibre and matcoveredn fused fiber splice, then matcoveredn optical fiber is drawn, it is not easy to fracture, the most described first has
One end of protective layer optical fiber is connected through the first line outlet in protecting box with a termination of bare fibre coil, and this first
The other end of matcoveredn optical fiber is pasted onto the first optical fiber by epoxide-resin glue and pastes the first viscose glue position on platform；And
One end of second matcoveredn optical fiber is connected through the second line outlet in protecting box with another termination of bare fibre coil,
And the other end of this second matcoveredn optical fiber is pasted onto the second optical fiber by epoxide-resin glue and pastes the second viscose glue on platform
Position；
As it is shown on figure 3, described bare fibre coil is that one section of bare wire optical fiber is by the optical fiber cable formed after tangled up and knotted
Circle, and this bare fibre coil diameter is between 14mm-16mm, preferred described bare fibre coil diameter is 15mm.In order to ensure
The a diameter of 15mm of fiber optic coils, is bonded together matcoveredn optical fiber epoxide-resin glue with protecting box inside protecting box,
During use, then removing with epoxy resin degumming agent, the most described first, second matcoveredn optical fiber is positioned at the portion of protecting box
Divide and be bonded in protecting box by epoxide-resin glue.
Described protecting box inwall is provided with anti-reflective layer, and described anti-reflective layer can pass through protecting box inwall painted black system
Becoming, it is reflective and affect the accuracy of monitoring result that this anti-reflective layer is prevented from metal inner surface, and the most described protecting box is corrosion resistant
The metal coating box that erosion, resistant to elevated temperatures metal material are made；Described protecting box profile is square, and this protecting box is divided into upper and lower two
Point, notice four screws and link the upper and lower two parts of protecting box at four angle points respectively.
A kind of using method based on Crack Monitoring sensor based on OTDR technique described above, including following step
Rapid: when a. is by concreting to height to be monitored, screeding concrete surface, by external fiber or the skin cable of monitoring instrument
Tighten and be laid in concrete surface, more described sensor is lain in concrete surface, then by fused fiber splice instrument by outside
Optical fiber or skin cable respectively with the termination welding of first, second matcoveredn optical fiber on described sensor, described external fiber
Or after the termination welding of the first, second matcoveredn optical fiber that skin cable is on described sensor, use at welding position
Heat-shrink tube is protected, and is being cased with stainless-steel pipe outside heat-shrink tube, prevents extensive style construction from making it rupture；B. in exterior light
Continuing to lay concrete above fibre or skin cable makes external fiber or skin cable maintain static, and by the time after concrete setting, uses
First, second optical fiber is pasted the epoxide-resin glue on platform and is removed by epoxy resin degumming agent, then proceedes to casting concrete.
The principle of the present invention:
When xoncrete structure unbalance stress, structure just has a certain degree of damage, and crack is that it shows the most intuitively
Form.The generation of xoncrete structure internal fissure and extension are difficult to accurately react internal fissure extension feelings by surface observation data
Condition, but its safety being directly connected to structure itself and workability.
The use principle of the present invention is during concrete structure pouring, when concreting to certain altitude, and will
External fiber is laid in xoncrete structure the position arranging monitoring, and protecting box lies against on concrete, then drawing protecting box
Outlet matcoveredn optical fiber and external fiber use fused fiber splice instrument welding, weld heat-shrink tube to be set with in end,
Stainless-steel pipe can be applied mechanically outside heat-shrink tube again and do protection use.After protecting box and external fiber thereof have been laid, use epoxy
The epoxide-resin glue at first, second viscose glue position is removed by resin degumming agent, then proceedes to pour layer concrete.If coagulation
Soil structure produces damage, and inside configuration crack constantly extends, and the diameter of bare fibre coil will be steadily decreasing, bending radius
Reducing therewith, light loss increases, and optical time domain reflectometer just can be monitored and be obtained corresponding data.By test, be given light loss with
The relation value of structural cracks size, just can draw opening of inside concrete crack according to the light loss value detected in application
Angle value, thus reflect that inside configuration crack produces and the degree of extension.Prove through lot of experiments, utilize fibre-optical bending to produce
The principle of loss, bare fibre coil diameter is that loss increases fast after 15mm, and optical time domain reflectometer can well monitor and split
The generation of seam and extension, it is therefore necessary to strict control bare fibre coil diameter size.
From the foregoing, the present invention can be used for the crack prison of the various xoncrete structure such as civil construction project, hydraulic engineering
Survey, be applied especially to dam safety monitoring, the feature of Crack Monitoring instrument distributed monitoring can be made full use of.
It is merely to illustrate embodiments of the present invention above in conjunction with the preferred embodiment of the present invention described by accompanying drawing, and
Not as to aforementioned invention purpose and claims content and the restriction of scope, every technical spirit according to the present invention
To any simple modification made for any of the above embodiments, equivalent variations and modification, the most still belong to the technology of the present invention and rights protection category.
Claims (3)
1. a using method for Crack Monitoring sensor based on OTDR technique, wherein, Crack Monitoring based on OTDR technique
Sensor includes protecting box, with the bare fibre coil of two terminations and first, second matcoveredn optical fiber, described bare fibre
Coil is arranged in protecting box, and the two ends, bottom of described protecting box are respectively arranged with first, second line outlet, and first,
It is respectively arranged with first, second optical fiber bottom protecting box below two line outlets and pastes platform；Described first matcoveredn optical fiber
One end be connected through the first line outlet in protecting box with a termination of bare fibre coil, and this first matcoveredn light
The fine other end is pasted onto the first optical fiber by epoxide-resin glue and pastes on platform；And one end of the second matcoveredn optical fiber passes
The second line outlet in protecting box is connected with another termination of bare fibre coil, and another of this second matcoveredn optical fiber
Hold and be pasted onto on the second optical fiber stickup platform by epoxide-resin glue；Described bare fibre coil is that one section of bare wire optical fiber is by being wound around
The fiber optic coils formed after knotting, and this bare fibre coil diameter is between 14mm-16mm；Optical time domain reflectometer is by being somebody's turn to do
Concrete can be constantly monitored by bare fibre coil, it is achieved the dynamic monitoring of concrete structure crack；It is characterized in that,
Comprise the following steps: when a. is by concreting to height to be monitored, screeding concrete surface, by the exterior light of monitoring instrument
Fine or skin cable is tightened and is laid in concrete surface, more described sensor is lain in concrete surface, then by external fiber
Or skin cable respectively with the termination welding of first, second matcoveredn optical fiber on described sensor；In described a step, institute
State external fiber or skin cable respectively with the termination welding of first, second matcoveredn optical fiber on described sensor after, molten
Connecing position uses heat-shrink tube to protect, and is being cased with stainless-steel pipe outside heat-shrink tube；B. on external fiber or skin cable
Continuing to lay concrete makes external fiber or skin cable maintain static, and by the time after concrete setting, uses epoxy resin degumming agent
First, second optical fiber is pasted the epoxide-resin glue on platform remove, then proceed to casting concrete.
The using method of Crack Monitoring sensor based on OTDR technique the most according to claim 1, it is characterised in that: described
Protecting box is internally provided with black layer, and the most described protecting box is the metal coating that metal material corrosion-resistant, resistant to elevated temperatures is made
Box.
The using method of Crack Monitoring sensor based on OTDR technique the most according to claim 2, it is characterised in that: described
Bare fibre coil diameter is 15mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310122222.6A CN103217109B (en) | 2013-04-09 | 2013-04-09 | A kind of Crack Monitoring sensor based on OTDR technique and using method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310122222.6A CN103217109B (en) | 2013-04-09 | 2013-04-09 | A kind of Crack Monitoring sensor based on OTDR technique and using method thereof |
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| CN103217109A CN103217109A (en) | 2013-07-24 |
| CN103217109B true CN103217109B (en) | 2016-11-23 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104266786A (en) * | 2014-09-05 | 2015-01-07 | 武汉理工光科股份有限公司 | Bolt fastening degree online detecting system and method based on OTDR technology |
| CN105403161B (en) * | 2015-12-29 | 2018-01-02 | 哈尔滨工业大学深圳研究生院 | A kind of method that concrete structure crack width is detected using fibre optical sensor |
| CN105606618B (en) * | 2016-01-18 | 2019-08-06 | 三峡大学 | A kind of overhead transmission line reinforced concrete foundation crack detecting device and method |
| CN106197487B (en) * | 2016-07-21 | 2018-10-02 | 大连海事大学 | A kind of sensor and preparation method thereof of miter gate's crackle on-line detecting system |
| CN106197486B (en) * | 2016-07-21 | 2018-08-31 | 大连海事大学 | A kind of construction method of miter gate's optical fiber crack sensor |
| 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 |
| CN109342460A (en) * | 2018-09-11 | 2019-02-15 | 中北大学 | A kind of wireless and passive pyrostat and preparation method thereof for Crack Monitoring |
| CN110987256A (en) * | 2020-01-03 | 2020-04-10 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | Mortar type optical fiber concrete stress sensor and manufacturing method thereof |
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| WO2009062131A1 (en) * | 2007-11-09 | 2009-05-14 | Draka Comteq, B.V. | Microbend- resistant optical fiber |
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| US4996884A (en) * | 1989-01-23 | 1991-03-05 | Felten & Guilleaume Energietechnik Gmbh | Light waveguide sensor for small pulling or pressing forces |
| CN101042328A (en) * | 2007-04-26 | 2007-09-26 | 南京航空航天大学 | Monitoring methods for reinforcement corrosion of long period optical fiber grating and sensor thereof |
| CN101055170A (en) * | 2007-05-31 | 2007-10-17 | 上海交通大学 | Replaceable embedding type optical fiber strain sensor |
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