CN104154874B - Monitoring device and method that armored concrete rust distending based on Fibre Optical Sensor splits - Google Patents
Monitoring device and method that armored concrete rust distending based on Fibre Optical Sensor splits Download PDFInfo
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- CN104154874B CN104154874B CN201410398763.6A CN201410398763A CN104154874B CN 104154874 B CN104154874 B CN 104154874B CN 201410398763 A CN201410398763 A CN 201410398763A CN 104154874 B CN104154874 B CN 104154874B
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Abstract
Monitoring device and method that the invention discloses a kind of armored concrete based on Fibre Optical Sensor becomes rusty, distending splits, its device includes a Brillouin fiber optic (1), Brillouin fiber optic (1) includes multistage strain monitoring fiber segment (3), the reinforcing bar (8) in every section of strain monitoring fiber segment (3) central authorities in reinforced concrete structure coils outward a circle, whole strain monitoring fiber segment (3) is all concentric, the length of the inside one circle strain monitoring fiber segment (3) is equal to the length of spatial resolution dz, from inside to outside often enclose the length of length spatial resolution dz more than the length of the inside one circle strain monitoring fiber segment (3) of strain monitoring fiber segment (3)；The key of its method is to be multiplied by, using the strain value of strain monitoring fiber segment (3), the width that spatial resolution dz draws crack.This device and method can detect the width in the crack and crack extrorse extent of Section Central from xoncrete structure.
Description
Technical field
The present invention relates to Health Monitoring for Civil Engineering field, it is especially a kind of rust of the armored concrete based on Fibre Optical Sensor
The monitoring device of the full size in the crack that distending splits and method.
Background technology
Steel bar corrosion is the one of the main reasons of concrete structure durability inefficacy it is estimated that whole world xoncrete structure is every
Year reinforce expense because of the maintenance that steel bar corrosion causes and reach 100,000,000,000 dollars.Because the generation with steel bar corrosion and development, reinforcing bar
The serviceability of xoncrete structure and security performance all will be adversely affected.The mechanics mould being split by armored concrete rust distending
Type understands, concrete strain will be caused during corrosion product fill concrete hole during steel bar corrosion to increase, thus
Lead to concrete cracking.Traditional strain testing technology such as resistance strain gage and vibrating string extensometer etc. has that volume is big, is easily subject to
The shortcomings of electromagnetic interference influence, corrosion-resistant, is it is impossible to meet the requirement of monitoring steel bar corrosion.
The existing correlational study of monitoring device that in prior art, the armored concrete rust distending based on Fibre Optical Sensor splits, such as specially
The patent of invention for ZL2010105715924 for the profit number discloses a kind of monitoring method based on Brillouin shift and equipment.With
Under be distribution type fiber-optic technology based on Brillouin shift ultimate principle.
When incident illumination enters fiber medium, the part energy in light wave can deviate original direction and to other each
Direction is propagated, here it is scattering of light phenomenon, one of which scattered light is called Brillouin scattering.Scattered light has with respect to incident illumination
The change of one frequency, referred to as Brillouin shift.Brillouin optical time domain analysis meter (BOTDA/R) is also referred to as Brillouin's (FBG) demodulator profit
With the linear relationship between the frequency shift amount of the Brillouin scattering of optical fiber and strain and temperature change, by measuring Brillouin scattering
Frequency shift amount νBObtain optical fiber temperature along the line and the distributed intelligence of strain.Fibre strain amount, temperature variation and the drift of Brillouin's frequency
Relation between shifting amount is as shown in formula：
In above formula, νB(0) for Brillouin's frequency frequency shift amount when initial strain, initial temperature, νB(ε, T) is in strain stress, temperature
Brillouin's frequency drift value during degree T, d νB/ dT temperature proportional coefficient, d νB/ d ε is Proportion of strain value coefficient, T-T0For temperature difference；ε is
Strain variation amount.
Prior art Brillouin's (FBG) demodulator is included based on the monitoring device of Brillouin shift and one can produce Brillouin
The sensor fibre (abbreviation Brillouin fiber optic) of scattering, this root optical fiber is made up of strain monitoring fiber segment and temperature-compensated fiber section,
Temperature-compensated fiber section is wound around and is cast in epoxy resin protection block, and strain monitoring fiber segment is in the reinforcing bar of armored concrete
Outer cincture one is enclosed and is cast in concrete, and strain monitoring fiber segment head end is connected with Brillouin's (FBG) demodulator, strain monitoring optical fiber
Section end is connected with temperature-compensated fiber section head end, and temperature-compensated fiber section end is connected with Brillouin's (FBG) demodulator.
The principle of this equipment is：Temperature-compensated fiber section is wrapped in epoxy resin protection block, will not send out with concrete
Raw any strain, therefore this fiber segment only can occur Brillouin shift due to temperature change, and strain monitoring fiber segment can be with mixed
Solidifying soil strains, the temperature change of this fiber segment and strain and all can cause Brillouin shift, therefore by strain monitoring fiber segment
Brillouin shift value deducts the Brillouin shift value of temperature-compensated fiber section, and the difference of the Brillouin shift value of gained is exactly complete
The frequency displacement being caused due to the strain of strain monitoring fiber segment, then by this difference divided by Proportion of strain value coefficient, finally just can be answered
Become the strain of monitoring fiber segment, that is, the strain of this section of reinforced concrete structure.
The armored concrete based on Fibre Optical Sensor of prior art becomes rusty the monitoring device that distending splits and detection method exist with
Lower drawback：This device and method, can only monitor total dependent variable on xoncrete structure section, and corrosive crack is always from section
Mediad edge extend up to crack finally from central authorities completely through being instant of complete cracking to edge, and the crack of instant of complete cracking goes out
It is not constitute harmful cracks on the ad-hoc location such as beam sides of beams of concrete now, but occurring in soffit is then harmful splitting
Seam；But the device and method of prior art had both examined the particular location in the crack not measuring this section, naturally have no way of determining whether
Harmful cracks, yet inspection does not measure the degree that the width in crack and crack extend from mediad edge, naturally concrete cannot be become rusty
The overall process that distending splits is tracked monitoring, more unpredictable crack when can instant of complete cracking, therefore the specific aim to harmful cracks
Prophylactico-therapeutic measuress are not just more known where to begin.
Content of the invention
The invention solves the problems that a technical problem be to provide a kind of width that can detect crack and crack from coagulation
The monitoring device that the armored concrete rust distending based on Fibre Optical Sensor of the extrorse extent of Section Central of soil structure splits.
A kind of technical solution of the present invention is to provide a kind of armored concrete based on Fibre Optical Sensor and becomes rusty what distending split
Monitoring device, it includes a Brillouin fiber optic and Brillouin's (FBG) demodulator, and the two ends of Brillouin fiber optic are demodulated with Brillouin
Instrument connects, and Brillouin fiber optic is alternately formed by connecting by multistage strain monitoring fiber segment and multistage temperature compensated optical fiber section, every section of temperature
Degree compensated optical fiber section is cast in an epoxy resin protection block, and multistage strain monitoring fiber segment is respectively positioned on reinforced concrete structure
Same section on, every section of strain monitoring fiber segment coils a circle outside the reinforcing bar in the central authorities of reinforced concrete structure, all
The all concentric and whole strain monitoring fiber segment of strain monitoring fiber segment be cast in concrete, the inside one circle strain monitoring
The length of fiber segment is equal to the length of spatial resolution dz, and from inside to outside often the length of circle strain monitoring fiber segment compares the inside
The length of many spatial resolution dz of length of one circle strain monitoring fiber segment.
The invention solves the problems that another technical problem be to provide a kind of width that can detect crack and crack from mixed
The monitoring side that the armored concrete rust distending based on Fibre Optical Sensor of the extrorse extent of Section Central of Xtah Crude Clay structure splits
Method.
Another kind of technical solution of the present invention is to provide a kind of rust distending of the armored concrete based on Fibre Optical Sensor and splits
Monitoring method, observe the image of each strain monitoring fiber segment on Brillouin's (FBG) demodulator, when certain circle strain monitoring fiber segment
Certain spatial resolution dz corresponding Brillouin shift value is increased sharply, then subtracted with this spatial resolution dz corresponding Brillouin shift value
Go the spatial resolution dz corresponding Brillouin shift value not occurring to increase sharply, the difference of the Brillouin shift value of gained is divided by strain
Proportionality coefficient, obtains the strain value of strain monitoring fiber segment, finally this strain value is multiplied by the value that spatial resolution dz draws just
It is the width in crack in this circle strain monitoring fiber segment, judge that crack has been extended to this circle strain monitoring fiber segment simultaneously.
The principle of this monitoring device and method is as follows.
It is firstly introduced into the concept of spatial resolution dz, distributed optical fiber strain sensor can be distributed to structural strain
Formula detect, but due to incident illumination exist pulse width limit so that this technology need to consider spatial resolution affect, sampled point should
Parameter is according to the concentrated expression of actually one section of optical fiber internal strain, and spatial resolution dz is exactly to adopt on Brillouin's (FBG) demodulator
Collect the shortest the one section optical fiber span length of data, if less than this fiber lengths, then cannot be carried out data acquisition.
In formula：Dz is spatial resolution size；W is incident pulse optical width, and V propagates in a fiber vertically for light wave
Speed.As can be seen here, spatial resolution is determined by incident light source, and the concrete numerical value of spatial resolution is knowable.
When crack extends to a certain circle strain monitoring fiber segment from central authorities, this crack only influences whether this circle strain monitoring
One spatial resolution dz of fiber segment makes this spatial resolution dz corresponding Brillouin shift value increase sharply and this circle strain prison
The Brillouin shift value corresponding to other spatial resolution dz surveying fiber segment no affects, so, when certain encloses strain monitoring optical fiber
Some spatial resolution dz corresponding Brillouin shift value of section is with respect to the corresponding brillouin frequency of other spatial resolution dz
Shifting value is increased sharply, then judge that crack has been extended to this circle strain monitoring fiber segment, the length in crack is exactly this circle strain monitoring light
The radius of fine section.
Further it is assumed that after concrete rust distending splits, fibre strain at crack is increased dramatically, remaining surveyed coagulation of position optical fiber
Native strain facies is more negligible than crack place.Therefore the fracture width of this circle strain monitoring fiber segment is w, then fibre strain is：
In formula, ε is fibre strain, and Δ L is that (i.e. fracture width w), L are optical fiber gauge length (i.e. space to elongate optical fiber value at crack
Resolution dz, because the strain sharp increase of optical fiber only exists in the range of spatial resolution at crack).
From this formula, fibre strain ε is multiplied by the value of spatial resolution dz gained it is simply that fracture width w.
And strain value ε is also to ask, subtracted using the spatial resolution dz corresponding Brillouin shift value occurring to increase sharply
Go the adjacent spatial resolution dz corresponding Brillouin shift value not occurring to increase sharply, the difference of the Brillouin shift value of gained is just
It is entirely due to crack strains the frequency displacement causing, then by this difference divided by Proportion of strain value coefficient, finally just can obtain crack strain
Value ε.
Therefore, after corrosion cracks of reinforced concrete, can calculate that according to recording fibre strain value and instrument space resolution rust is swollen
Fracture width value.
The armored concrete based on Fibre Optical Sensor for the present invention becomes rusty the monitoring device split of distending and method compared with prior art,
There is advantages below and beneficial effect.
Analysis due to the preceding paragraph understands, using this device and the method, can accurately know the width in crack and crack from
The degree that the edge of mediad concrete cross section extends, realizes the complete tracking prison to the overall process that concrete rust distending splits
Survey, more can Accurate Prediction crack when can instant of complete cracking, therefore can great targetedly to being possible to develop into the shape of harmful cracks
Condition makes special treatment measures in advance, such as controls the chlorine ion concentration of inside concrete using the method for electrochemical dechlorination, from
And effectively prevent the cracking further of corrosive crack.
As improvement, this device also includes a Bragg grating optical fiber and Prague (FBG) demodulator, Bragg grating
The two ends of optical fiber are connected with Prague (FBG) demodulator, and Bragg grating optical fiber is located at armored concrete with whole strain monitoring fiber segments
On the same section of structure, Bragg grating optical fiber coils a circle, this circle outside the reinforcing bar in the central authorities of reinforced concrete structure
Multiple gratings have been uniformly distributed circumferentially on Bragg grating optical fiber.
Using this device, achievable following methods, Prague (FBG) demodulator can be formed on Bragg grating optical fiber each
The image of grating corresponding incidence center wavelength of light, observes this image, once showing occurs in the centre wavelength at two adjacent gratings
Write and reduce, then judge that the position in crack is in the angle between two gratings.
The principle of this monitoring device and method is：The refractive index of each grating on Bragg grating optical fiber is significantly different
, so, at each grating, the centre wavelength of incident illumination is also each different, so, shows on the (FBG) demodulator of Prague
The centre wavelength of each different grating be visibly different, this just serves the effect of flag node, and people can be very convenient
By centre wavelength identify this centre wavelength corresponding be which light grid node concrete；And, centre wavelength can be subject to
The impact of strain, when crack between two gratings, crack can cause the concrete stress of this position to discharge, thus leading to
Strain substantially reduces, so, when the centre wavelength of two adjacent gratings significantly reduces simultaneously, indicate that crack be located at two adjacent
Between grating；Moreover, all gratings are equally distributed along the circumference of this circle Bragg grating optical fiber, so, are the formation of
The structure of similar dial scale, finds out corresponding scale by there are significantly reduced two gratings of wavelength, the prison being just apparent from
Measure the angle in crack.Such as this circle Bragg grating optical fiber is evenly equipped with 12 gratings, the 5th and the 6th grating discovery
Wavelength increases sharply, then judge that crack is to extend along the direction between 5 points to 6 points of section.By judging fracture extension
Direction, the position that the final crack of deduction that can be apparent from occurs is in beam sides or soffit, if for harmful cracks, if
Infer that crack will appear in soffit, then must carry out electrochemical dechlorination process in advance, it is to avoid harmful cracks ftracture further.
Brief description
Fig. 1 is that the Brillouin fiber optic of the monitoring device that the armored concrete rust distending based on Fibre Optical Sensor for the present invention splits launches
Structural representation afterwards.
Fig. 2 is that the monitoring device that the armored concrete rust distending based on Fibre Optical Sensor for the present invention splits is disconnected in xoncrete structure
Cross section structure diagram on face.
The armored concrete that Fig. 3 is the present invention based on Fibre Optical Sensor becomes rusty the monitoring method that distending splits on Brillouin's (FBG) demodulator
The length with regard to Brillouin fiber optic of display and the functional relationship schematic diagram of this length corresponding Brillouin shift value.
The armored concrete that Fig. 4 is the present invention based on Fibre Optical Sensor becomes rusty the monitoring method that distending splits on the (FBG) demodulator of Prague
The schematic diagram with regard to the corresponding incidence center wavelength of light of each grating on Bragg grating optical fiber of display.
1, Brillouin fiber optic shown in figure, 2, Brillouin's (FBG) demodulator, 3, strain monitoring fiber segment, 4, temperature-compensated fiber
Section, 5, epoxy resin protection block, 6, Bragg grating optical fiber, 7, Prague (FBG) demodulator, 8, reinforcing bar.
Specific embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
As shown in Figure 1, Figure 2, Figure 3, Figure 4, the monitoring dress that the armored concrete rust distending based on Fibre Optical Sensor for the present invention splits
Put, it includes a Brillouin fiber optic 1 and Brillouin's (FBG) demodulator 2, the two ends of Brillouin fiber optic 1 and Brillouin's (FBG) demodulator 2
Connect.Brillouin fiber optic 1 is alternately formed by connecting by multistage strain monitoring fiber segment 3 and multistage temperature compensated optical fiber section 4, specifically
Say, this Brillouin fiber optic 1 is by first paragraph strain monitoring fiber segment 3, temperature-compensated fiber section 4, second segment strain monitoring fiber segment
3rd, temperature-compensated fiber section 4, the 3rd section of strain monitoring fiber segment 3, n-th section of strain monitoring optical fiber of temperature-compensated fiber section 4 ...
Section 3, temperature-compensated fiber section 4 are connected in sequence.Every section of temperature-compensated fiber section 4 is cast in an epoxy resin protection block 5
Interior, multistage strain monitoring fiber segment 3 is respectively positioned on the same section of reinforced concrete structure, every section of strain monitoring fiber segment 3
In outer coiling one circle of reinforcing bar 8 in the central authorities of reinforced concrete structure, what whole strain monitoring fiber segment 3 was all concentric and whole should
Become monitoring fiber segment 3 to be cast in concrete.The length of the inside one circle strain monitoring fiber segment 3 is equal to a spatial resolution
The length of dz, the length from inside to outside often enclosing strain monitoring fiber segment 3 is one more than the length of the inside one circle strain monitoring fiber segment 3
That is to say, that from the inside out, first paragraph strain monitoring fiber segment 3 length is a space to the length of individual spatial resolution dz
The length of resolution dz, second segment strain monitoring fiber segment 3 length is the length of two spaces resolution dz, the 3rd section of strain prison
Survey n-th section of strain monitoring fiber segment 3 length of length ... that fiber segment 3 length is three spatial resolution dz to divide for n space
The length of resolution dz.Certainly, whole epoxy resin protection blocks 5 is also cast in concrete.
This monitoring device also includes a sensor fibre (abbreviation Bragg grating optical fiber 6) and being carved with Bragg grating
Individual Prague (FBG) demodulator 7, the two ends of Bragg grating optical fiber 6 are connected with Prague (FBG) demodulator 7.Bragg grating optical fiber 6 with complete
Portion's strain monitoring fiber segment 3 is located on the same section of reinforced concrete structure, and Bragg grating optical fiber 6 is in armored concrete
Outer coiling one circle of reinforcing bar 8 in the central authorities of structure, this circle Bragg grating optical fiber 6 has been uniformly distributed circumferentially multiple gratings.
The monitoring method that the armored concrete rust distending based on Fibre Optical Sensor for the present invention splits, its step includes：Observe background of cloth
The image of each strain monitoring fiber segment 3 on deep (FBG) demodulator 2, when certain spatial resolution dz of certain circle strain monitoring fiber segment 3
Corresponding Brillouin shift value is increased sharply, and middle spatial resolution dz of the such as the 3rd circle strain monitoring fiber segment 3 is corresponding
Brillouin shift value is increased sharply, then deduct the spatial discrimination not occurring to increase sharply with this spatial resolution dz corresponding Brillouin shift value
Rate dz corresponding Brillouin shift value, the difference of the Brillouin shift value of gained, divided by Proportion of strain value coefficient, obtains strain monitoring
The strain value of fiber segment 3, finally this strain value being multiplied by the value that spatial resolution dz draws is exactly this circle strain monitoring fiber segment 3
The width in upper crack, judges that crack has been extended to this circle strain monitoring fiber segment 3 that is to say, that the length in this crack simultaneously
For the radius of this circle strain monitoring fiber segment 3, in particular, there is the strain prison that Brillouin shift value is increased sharply in outermost one circle
The radius surveying fiber segment 3 is exactly the length in crack.As shown in figure 3, in this schematic diagram, from interior outward, first lap strain monitoring light
The only one spatial resolution dz corresponding Brillouin shift value of fine section 3 is increased sharply, the right of the second circle strain monitoring fiber segment 3
The corresponding Brillouin shift value of one spatial resolution dz is increased sharply, and centre one space of the 3rd circle strain monitoring fiber segment 3 is divided
Resolution dz corresponding Brillouin shift value is increased sharply, and can be determined that crack has been extended to the 3rd circle strain monitoring fiber segment from figure
3.
This monitoring method is further comprising the steps of：Can be formed on Bragg grating optical fiber 6 on Prague (FBG) demodulator 7 each
The image of grating corresponding incidence center wavelength of light, observes this image, once showing occurs in the centre wavelength at two adjacent gratings
Write and reduce, then judge that the position in crack is in the angle between two gratings.As shown in figure 4, this Bragg grating optical fiber 6 one
Have 12 gratings, the only centre wavelength of the 5th and the 6th two gratings is (i.e. empty with respect to respective original state
Line part) occur in that and significantly reduce, then the angle in this crack is 150 degree between 180 degree.
Claims (4)
1. the monitoring device that a kind of armored concrete rust distending based on Fibre Optical Sensor splits, it includes a Brillouin fiber optic (1)
With Brillouin's (FBG) demodulator (2), the two ends of Brillouin fiber optic (1) be connected with Brillouin's (FBG) demodulator (2) it is characterised in that：Cloth
In deep optical fiber (1) be alternately formed by connecting by multistage strain monitoring fiber segment (3) and multistage temperature compensated optical fiber section (4), every section of temperature
Degree compensated optical fiber section (4) is cast in epoxy resin protection block (5), and multistage strain monitoring fiber segment (3) is respectively positioned on reinforcing bar
On the same section of xoncrete structure, the reinforcing bar (8) in every section of strain monitoring fiber segment (3) central authorities in reinforced concrete structure
Outer coiling one circle, all concentric and whole strain monitoring fiber segment (3) of whole strain monitoring fiber segment (3) is cast in concrete
Interior, the length of the inside one circle strain monitoring fiber segment (3) is equal to the length of spatial resolution dz, and from inside to outside often circle should
Become the length of length spatial resolution dz more than the length of the inside one circle strain monitoring fiber segment (3) of monitoring fiber segment (3)
Degree.
2. the monitoring device that the armored concrete rust distending based on Fibre Optical Sensor according to claim 1 splits, its feature exists
In：It also includes a Bragg grating optical fiber (6) and Prague (FBG) demodulator (7), the two ends of Bragg grating optical fiber (6)
It is connected with Prague (FBG) demodulator (7), Bragg grating optical fiber (6) is located at armored concrete with whole strain monitoring fiber segments (3)
On the same section of structure, the reinforcing bar (8) in the central authorities in reinforced concrete structure for the Bragg grating optical fiber (6) coils outward one
Circle, this circle Bragg grating optical fiber (6) has been uniformly distributed circumferentially multiple gratings.
3. the monitoring method that a kind of armored concrete rust distending based on Fibre Optical Sensor splits, it is using as claimed in claim 1
Armored concrete based on Fibre Optical Sensor become rusty the monitoring device split of distending it is characterised in that：Observe Brillouin's (FBG) demodulator (2) upper each
The image of individual strain monitoring fiber segment (3), when the corresponding background of cloth of certain spatial resolution dz of certain circle strain monitoring fiber segment (3)
Deep frequency shift value increases sharply, then deduct spatial resolution dz not occurring to increase sharply with this spatial resolution dz corresponding Brillouin shift value
Corresponding Brillouin shift value, the difference of the Brillouin shift value of gained, divided by Proportion of strain value coefficient, obtains strain monitoring optical fiber
The strain value of section (3), finally this strain value being multiplied by the value that spatial resolution dz draws is exactly this circle strain monitoring fiber segment (3)
The width in upper crack, judges that crack has been extended to this circle strain monitoring fiber segment (3) simultaneously.
4. the monitoring method that the armored concrete rust distending based on Fibre Optical Sensor according to claim 3 splits, its feature exists
In：Each grating on Bragg grating optical fiber (6) corresponding incidence center wavelength of light can be formed on Prague (FBG) demodulator (7)
Image, observes this image, once significantly reducing occurs in the centre wavelength at two adjacent gratings, then judge crack position be
In angle between two gratings.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6626285B2 (en) * | 2015-03-27 | 2019-12-25 | 太平洋セメント株式会社 | Corrosion state prediction method |
| CN106525860A (en) * | 2016-09-28 | 2017-03-22 | 重庆揽光科技有限公司 | Method for monitoring concrete based on Brillouin sensor |
| CN107228800A (en) * | 2017-05-27 | 2017-10-03 | 中国石油大学(北京) | A kind of experimental method of indoor real-time dynamic monitoring hydraulic fracture slit width |
| CN109781021A (en) * | 2019-01-22 | 2019-05-21 | 浙江工业大学 | The fiber-optic grating sensor predicted for real-time monitoring reinforcing bar surrounding concrete rust crack strain field in situ and rust crack |
| CN109991593B (en) * | 2019-03-13 | 2023-01-03 | 上海交通大学 | Cabled submersible positioning device and method based on multi-core optical fiber Brillouin scattering |
| 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 |
| CN113310423B (en) * | 2021-04-25 | 2023-03-24 | 东南大学 | Crack sensing system and method based on distributed short-gauge-length optical fiber strain sensor |
| CN113338906B (en) * | 2021-06-29 | 2023-07-07 | 中国海洋石油集团有限公司 | Stratum soil deformation monitoring device and method in hydrate generation and exploitation process |
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