CN108413886A - A kind of FBG encapsulating structures that can monitor soil body micro-strain and packaging method - Google Patents
A kind of FBG encapsulating structures that can monitor soil body micro-strain and packaging method Download PDFInfo
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- CN108413886A CN108413886A CN201810065855.0A CN201810065855A CN108413886A CN 108413886 A CN108413886 A CN 108413886A CN 201810065855 A CN201810065855 A CN 201810065855A CN 108413886 A CN108413886 A CN 108413886A
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- fbg
- soil body
- thermoplastic tube
- thermoplastic
- fiber
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
Abstract
The present invention proposes a kind of the FBG encapsulating structures and packaging method of monitoring soil body micro-strain, and protection is packaged to FBG using the thermoplastic tube and quartz ampoule that increase skin-friction coefficient, is needed to select the suitable thermoplastic tube of size and quartz ampoule according to actual monitoring；It is fixed mounted on FBG gratings side after thermoplastic tube sand for surface paper is polished；In grid region, installation quartz socket tube protects grid region, prevents destruction of the shear strain to grid region；One thermoplastic tube Jing Guo same treatment, as soil body micro-strain FBG sensor are installed in the grid regions the FBG other side.Invention increases the friction effect between FBG sensor and the soil body, the compatible deformation between FBG sensor and the soil body is improved, can sense when the micro-strain of the soil body；The soil body is effectively avoided directly to squeeze the shear action of generation, the survival rate for improving the FBG embedment soil bodys and the service life in the soil body are capable of the variation of the reliable lasting monitoring soil body.
Description
Technical field
The invention belongs to Rock And Soil disaster preventions to monitor field, be related to a kind of FBG encapsulating structures and packaging method, especially relate to
And a kind of FBG encapsulating structures that can monitor soil body micro-strain and packaging method.
Background technology
Rock And Soil disaster prevention monitoring field is an observation subject, only total by different observation in scientific research
Knot can just accomplish the improvement and prevention of disaster.In Rock And Soil diaster prevention and control field, the generation of each single item Rock And Soil disaster is not all from
The deformation of the soil body is opened, the deformation of macroscopical Rock And Soil is typically to be made of several local soil body micro-strains.Therefore, the soil body is micro-
The observation of small deformation is to study the important indicator of Rock And Soil macro-mechanical characters, observation, plastic zone soil such as falling property of loess body
The variation etc. of soil body mechanical property is related to the slow small variation of the soil body during the variation of body, clay body moisture evaporation are cracked
When process, it is required for accurately observing the micro-strain variation of the soil body at any time, observation and summary to soil body micro-strain, are pre-
The important channel for the geological disaster that survey and prevention may occur.
Based on the high-precision strain-responsive features of FBG, when soil body variation of ambient temperature is little, do not consider temperature to FBG
The influence of monitoring can directly be converted to the strain variation of tested point according to the wavelength change that FBG is measured.If un-encapsulated directly will
FBG is embedded, and the one side soil body directly squeezes FBG sensing elements with the soil body to be measured, can make FBG sensing elements that shearing occur broken
It is bad；On the other hand since optical fiber surface is smooth, the friction between the soil body is small, especially after chance water when soil deformation is larger two
It will produce opposite sliding between person, both of which will have a direct impact on monitoring of the FBG sensing elements to tested point soil deformation.Thus
Author attempts to protect optical fiber grid region using PVC plastic casing, but plastic bushing is easy to send out during being embedded to the soil body
The raw changing of the relative positions so that grid region is exposed outside, does not well solve the protection problem in grid region, and when overlying burden is larger
Pvc pipe itself can bend, and the FBG sensing elements inside pvc pipe also generate certain bending, can shorten FBG in the course of time
The service life of sensor；Furthermore the compatible deformation between the soil body and optical fiber is not also resolved well.For this purpose, author tastes again
Examination installs a fixed thermoplastic tube respectively using quartzy protection of pipe FBG sensor grid region in FBG sensing elements both sides.Stone
English pipe bend resistance ability is strong, FBG sensor grid region can be avoided by bending failure using quartz ampoule.Thermoplastic tube is heated can be with light
Fine lead is bonded together, and on the one hand can serve as bellend, reinforces the degree of coupling of the soil body and optical fiber, improves compatible deformation；Separately
On the one hand, the confined quartz ampoule in both sides can prevent the protection pipe in grid region from sliding, and maximum limit is played to FBG sensing elements
The protection of degree.However the experimental results showed that, although grid region protection pipe fall off and buckling problem is resolved, and optical fiber and the soil body
Between compatible deformation be also improved, but the soil body and optical fiber are still easy to happen slippage after meeting water, cannot be good
Compatible deformation occurs.
Invention content
In order to solve the above-mentioned technical problem, the present invention proposes a kind of coupling enhanced between optical fiber and the soil body, changes
The FBG encapsulating structures and packaging method that can monitor soil body micro-strain of the compatible deformation of kind optical fiber and the soil body.
To achieve the goals above, the present invention adopts the following technical scheme that：
A kind of FBG encapsulating structures that can monitor soil body micro-strain, it is characterised in that：It is described that can to monitor the soil body small
The FBG encapsulating structures of deformation include FBG sensing elements, quartz ampoule and thermoplastic tube；FBG sensing elements both sides are provided with light
Fine lead；The thermoplastic tube is two；The quartz pipe sleeve is outside FBG sensing elements；Two thermoplastic tubes are set in
Outside the fiber-optic wire of FBG sensing elements both sides；The quartz ampoule is nested with thermoplastic tube.
Preferably, the outer diameter of quartz ampoule is more than the outer diameter of fiber-optic wire and the internal diameter less than thermoplastic tube.
Preferably, being filled with colloid between thermoplastic tube and fiber-optic wire.
Preferably, the fixed section that thermoplastic tube is divided into active segment along the axial direction of thermoplastic tube and is connected with active segment；
The quartz ampoule is nested in active segment with thermoplastic tube；Glue is filled between the thermoplastic tube and fiber-optic wire at fixed section
Body.
Preferably, the outer surface of thermoplastic tube is coarse.
Preferably, needing to remove the coat wrapped up on fiber-optic wire outer wall.
A kind of packaging method based on the FBG encapsulating structures that can monitor soil body micro-strain as previously described, feature
It is：It the described method comprises the following steps：
1) the suitable thermoplastic tube of size and quartz ampoule are selected according to actual demand；
2) outer surface of thermoplastic tube is polished with sand paper, forms rough surface；The thermoplastic tube include left side thermoplastic tube with
And right side thermoplastic tube；
3) left side thermoplastic tube set will be fixed after fiber-optic wire that left side thermoplastic tube is sleeved on the left of FBG sensing elements；
4) by quartz pipe sleeve on FBG sensing elements；
5) right side thermoplastic tube set will be fixed after fiber-optic wire that right side thermoplastic tube is sleeved on the right side of FBG sensing elements；
6) left side thermoplastic pipe sleeve and right side thermoplastic pipe sleeve are heated, makes left side thermoplastic pipe sleeve and right side thermoplastic pipe sleeve point
It is not bonded with fiber-optic wire.
Further include in left side thermoplastic pipe sleeve and optical fiber preferably, when left side thermoplastic tube set being fixed in step 3)
The step of colloid is filled between lead；Further include in right side thermoplastic tube when right side thermoplastic tube set being fixed in step 5)
The step of colloid is filled between set and fiber-optic wire.
Preferably, longest distance of the colloid in thermoplastic pipe sleeve and fiber-optic wire is less than the length of thermoplastic pipe sleeve, in heat
The part for moulding filling colloid between pipe sleeve and fiber-optic wire forms fixed section, and glue is not filled by between thermoplastic pipe sleeve and fiber-optic wire
The part of body forms active segment；The quartz ampoule is nested in active segment with thermoplastic tube.
The beneficial effects of the invention are as follows：
1) encapsulating material of the thermoplastic tube and quartz ampoule of improvement as FBG sensing elements is had selected, high degree is utilized
The flexibility of thermoplastic tube, easily cohesive characteristic and quartz ampoule hardness are big, rigidity is big, inflexible characteristic so that FBG is to be measured
It will not be destroyed under Rock And Soil internal environment, extend the actual life of slope surface monitoring sensor well；Simultaneously
Also the soil body in monitoring process is prevented to improve the success rate of the implantation soil body to the direct racking strain of FBG as much as possible.
2) by artificially increasing the friction coefficient of protecting pipe, and it is larger in FBG gratings both sides peace skin-friction coefficient
Protecting pipe is installed quartz ampoule in grid region, the compatible deformation of the soil body and optical fiber is greatly improved, after the completion of being encapsulated using this method
FBG sensor it is small, the embedment soil body can ignore the influence to soil body mechanical property, to utmostly improving FBG
The accuracy of sensing element monitoring data and the reliability for increasing the sensor implantation soil body.
Description of the drawings
Fig. 1 is the overall structure diagram of the FBG encapsulating structures provided by the present invention that can monitor soil body micro-strain；
Fig. 2 is the sectional view that Fig. 1 is cut along the faces AA-BB；
Wherein：
1- coats；2- fiber-optic wires；3- thermoplastic tubes；4- quartz ampoules；5-FBG sensing elements；6- colloids；7- active segments；
8- fixed sections.
Specific implementation mode
The present invention will be further explained for example below in conjunction with the accompanying drawings.
The principle of the invention is：It, can be according to FBG waves by FBG embedment soil body tested points due to FBG sensor strain sensitive
The soil body strain variation of long variation monitoring embedment point, but since optical fiber smooth in appearance, friction coefficient are small, optical fiber holds very much with the soil body
Opposite sliding easily occurs, this effect is more obvious after meeting water.Outer diameter is selected to be fixed on grating slightly larger than the thermoplastic tube of optical fiber
Both sides, serve as bellend can effectively so that the soil body is with fiber coupling together with, while in order to increase thermoplastic tube and the soil body it
Between friction, sheath pipe surface is polished with sand paper, forms shaggy thermoplastic tube.In FBG sensor sensing element area, use
Outer diameter is slightly smaller than thermoplastic tube, and the quartz ampoule that internal diameter is more than fiber-optic wire is protected, and side nested against one another is utilized at two interface tubes
Formula is handled.By the above-mentioned means, effectively preventing the opposite sliding between the soil body and optical fiber, association between the two is improved
Soil body micro-strain monitoring precision is greatly improved in modulation shape.Meanwhile influence of this protected mode to the embedment soil body
It is small, the survival rate of the embedment soil body can be greatly improved, service life of the FBG in soil deformation monitoring is extended, to make to use the party
The FBG sensor of method encapsulation is preferably served in the monitoring of soil body micro-strain.
The present invention thermoplastic tube coarse in grating both sides installation surface, one section of filling colloid of thermoplastic tube is fixed with optical fiber to be ensured
The compatible deformation of optical fiber and the soil body retains 3mm or so and is not filled with colloid in order to which coarse protecting pipe forms nested, general with quartz ampoule
Quartz ampoule is fixed movable in a certain range.After above-mentioned packaged type, the thermoplastic tube of both sides can ensure the soil body
When deformation, corresponding compatible deformation occurs for optical fiber, and the nesting that the coarse protecting pipe in both sides can be utilized to be formed, and prevents grating grid region
Quartz protecting tube fall off so that ITTQT-FBG (the Improved Thermoplastic Tube and Quartz of encapsulation
It Tube) being capable of the accurately permanent micro-strain for monitoring the tested point soil body.The heat that the present invention selects skin-friction coefficient larger
Modeling pipe and quartz ampoule are packaged protection to FBG.Shaggy thermoplastic tube can enhance the change of the coordination between optical fiber and the soil body
Shape；Quartz ampoule protects FBG sensing elements to greatest extent, avoids shear property model of the soil body to grating, substantially increases and bury
Enter survival rate and the service life of the soil body；Along with the distinctive strain of FBG sensor itself is highly sensitive so that the FBG after encapsulation is passed
Sensor being capable of the micro-strain accurate, reliable, for a long time that monitored in the soil body.
Specifically, the present invention provides a kind of FBG encapsulating structures that can monitor soil body micro-strain, soil can be monitored
The FBG encapsulating structures of body micro-strain include FBG sensing elements 5, quartz ampoule 4 and thermoplastic tube 3；5 both sides of FBG sensing elements are set
It is equipped with fiber-optic wire 2；Thermoplastic tube 3 is two；Quartz ampoule 4 is sleeved on outside FBG sensing elements 5；Two thermoplastic tubes 3 are set with
Outside the fiber-optic wire 2 of 5 both sides of FBG sensing elements；Quartz ampoule 4 is nested with thermoplastic tube 3.
The outer diameter of quartz ampoule 4 is more than the outer diameter of fiber-optic wire 2 and the internal diameter less than thermoplastic tube 3.
Colloid 6 is filled between thermoplastic tube 3 and fiber-optic wire 2.
Thermoplastic tube 3 is divided into active segment 7 and the fixed section being connected with active segment 78 along the axial direction of thermoplastic tube 3；Quartz
Pipe 4 is nested in active segment 7 with thermoplastic tube 3；Colloid 6 is filled between thermoplastic tube 3 and fiber-optic wire 2 at fixed section 8；Heat
It is coarse to mould the outer surface of pipe 3；Remove the coat 1 wrapped up on 2 outer wall of fiber-optic wire.
A kind of packaging method based on such as preceding FBG encapsulating structures that can monitor soil body micro-strain, method include with
Lower step：
1) the suitable thermoplastic tube 3 of size and quartz ampoule 4 are selected according to actual demand；
2) outer surface of thermoplastic tube 3 is polished with sand paper, forms rough surface；Thermoplastic tube 3 include left side thermoplastic tube and
Right side thermoplastic tube；
3) left side thermoplastic tube set is consolidated after left side thermoplastic tube being sleeved on the fiber-optic wire 2 in 5 left side of FBG sensing elements
It is fixed；
4) quartz ampoule 4 is sleeved on FBG sensing elements 5；
5) right side thermoplastic tube set is consolidated after right side thermoplastic tube being sleeved on the fiber-optic wire 2 on 5 right side of FBG sensing elements
It is fixed；
6) left side thermoplastic pipe sleeve and right side thermoplastic pipe sleeve are heated, makes left side thermoplastic pipe sleeve and right side thermoplastic pipe sleeve point
It is not bonded with fiber-optic wire 2.
Further include between left side thermoplastic pipe sleeve and fiber-optic wire 2 when left side thermoplastic tube set being fixed in step 3)
The step of filling colloid 6；Further include in right side thermoplastic pipe sleeve and optical fiber when right side thermoplastic tube set being fixed in step 5)
The step of colloid 6 are filled between lead 2.
Longest distance of the colloid 6 in thermoplastic pipe sleeve 3 and fiber-optic wire 2 is less than the length of thermoplastic pipe sleeve 3, in thermoplastic pipe sleeve
The part that colloid 6 is filled between 3 and fiber-optic wire 2 forms fixed section 8, and glue is not filled by between thermoplastic pipe sleeve 3 and fiber-optic wire 2
The part of body 6 forms active segment 7；Quartz ampoule 4 is nested in active segment 7 with thermoplastic tube 3.
Referring to Fig. 1 and Fig. 2, with long 40mm, internal diameter 1.8mm, the heat-shrink tube of outer diameter 2.5mm and long 30mm, internal diameter 1mm,
For the quartz ampoule of outer diameter 1.5mm, technical solution provided by the present invention is described in detail：
A kind of FBG sensor package method that can monitor soil body micro-strain, encapsulation mainly comprise the following steps：
The suitable thermoplastic tube 3 of size and quartz ampoule 4 are selected according to actual demand；With sand paper polish thermoplastic tube 3, polishing when
It is different according to actual needs that different sand paper can be selected to polish to form different surfaces by 3 surrounding grinding homogeneity of thermoplastic tube
Friction coefficient, the test of friction coefficient can use identical material contracting with heat to make standard sample, then use friction coefficient tester into
Row test；When thermoplastic tube 3 on the left of installation, installs after the coat 1 above fiber-optic wire 2 is removed, need herein again
By in the corresponding 37mm length of fixation coat stripping, can make in this way thermoplastic tube 3 when heat is shunk preferably with light
Fine lead 2 fits together.Since 3 internal diameter of thermoplastic tube is more than fiber-optic wire 2, need to fill shape between the two with colloid when fixed
At gap, i.e., fixed section 8 fill colloid 6, retain active segment 7 be not filled with colloid, this colloid filling 8 length of fixed section
For 37mm, 7 length of active segment is 3mm；When FBG sensing elements 5 install quartz ampoule 4, one end of quartz ampoule will be nested in activity
It in section 7, can prevent from big bending occurs at two interface tubes in this way optical fiber is caused to destroy, the nested length in left side is 3mm herein.
When thermoplastic tube 3 is installed on right side, scope of activities appropriate stayed to quartz ampoule 4, prevent quartz ampoule 4 is stuck, right side nesting is grown
Degree is 3mm, stays the activity interval of 1mm, so the spacing between two thermoplastic tubes 3 is 25mm.After installing, hot hair dryer is used
Carrying out micro- heating to thermoplastic tube makes thermoplastic tube 3 fit together with fiber-optic wire 2, it should be noted that temperature when to heating is controlled
System, avoids thermoplastic tube that big deformation occurs, is eventually fabricated ITTQT-FBG.
Claims (9)
1. a kind of FBG encapsulating structures that can monitor soil body micro-strain, it is characterised in that：It is described to monitor the small change of the soil body
The FBG encapsulating structures of shape include FBG sensing elements（5）, quartz ampoule（4）And thermoplastic tube（3）；The FBG sensing elements（5）Two
Side is provided with fiber-optic wire（2）；The thermoplastic tube（3）It is two；The quartz ampoule（4）It is sleeved on FBG sensing elements（5）Outside
Portion；Two thermoplastic tubes（3）It is set in FBG sensing elements（5）The fiber-optic wire of both sides（2）It is external；The quartz ampoule（4）With
Thermoplastic tube（3）It is nested.
2. the FBG encapsulating structures according to claim 1 that soil body micro-strain can be monitored, it is characterised in that：The stone
Ying Guan（4）Outer diameter be more than fiber-optic wire（2）Outer diameter and be less than thermoplastic tube（3）Internal diameter.
3. the FBG encapsulating structures according to claim 2 that soil body micro-strain can be monitored, it is characterised in that：The heat
Modeling pipe（3）With fiber-optic wire（2）Between be filled with colloid（6）.
4. the FBG encapsulating structures according to claim 3 that soil body micro-strain can be monitored, it is characterised in that：The heat
Modeling pipe（3）Along thermoplastic tube（3）Axial direction be divided into active segment（7）And and active segment（7）Connected fixed section（8）；It is described
Quartz ampoule（4）In active segment（7）In with thermoplastic tube（3）It is nested；The thermoplastic tube（3）With fiber-optic wire（2）Between in fixation
Section（8）Place is filled with colloid（6）.
5. according to any FBG encapsulating structures that can monitor soil body micro-strain of claim 1-4, it is characterised in that：
The thermoplastic tube（3）Outer surface be coarse.
6. the FBG encapsulating structures according to claim 5 that soil body micro-strain can be monitored, it is characterised in that：The light
Fine lead（2）Outer wall on be enclosed with coat（1）.
7. a kind of packaging method based on the FBG encapsulating structures that can monitor soil body micro-strain as claimed in claim 6,
It is characterized in that：It the described method comprises the following steps：
1）The suitable thermoplastic tube of size is selected according to actual demand（3）And quartz ampoule（4）；
2）By thermoplastic tube（3）Outer surface polished with sand paper, formed rough surface；The thermoplastic tube（3）Including left side thermoplastic tube
And right side thermoplastic tube；
3）Left side thermoplastic tube is sleeved on FBG sensing elements（5）The fiber-optic wire in left side（2）Left side thermoplastic tube set is consolidated afterwards
It is fixed；
4）By quartz ampoule（4）It is sleeved on FBG sensing elements（5）On；
5）Right side thermoplastic tube is sleeved on FBG sensing elements（5）The fiber-optic wire on right side（2）Right side thermoplastic tube set is consolidated afterwards
It is fixed；
6）Left side thermoplastic pipe sleeve and right side thermoplastic pipe sleeve are heated, make left side thermoplastic pipe sleeve and right side thermoplastic pipe sleeve respectively with
Fiber-optic wire（2）Fitting.
8. according to the method described in claim 7, it is characterized in that：The step 3）In left side thermoplastic tube set is fixed
When, further include in left side thermoplastic pipe sleeve and fiber-optic wire（2）Between fill colloid（6）The step of；In step 5）In to right side heat
Further include in right side thermoplastic pipe sleeve and fiber-optic wire when modeling pipe sleeve is fixed（2）Between fill colloid（6）The step of.
9. according to the method described in claim 8, it is characterized in that：The colloid（6）In thermoplastic pipe sleeve（3）With fiber-optic wire
（2）Interior longest distance is less than thermoplastic pipe sleeve（3）Length, in thermoplastic pipe sleeve（3）With fiber-optic wire（2）Between fill colloid
（6）Part formed fixed section（8）, in thermoplastic pipe sleeve（3）With fiber-optic wire（2）Between be not filled by colloid（6）Part formed
Active segment（7）；The quartz ampoule（4）In active segment（7）In with thermoplastic tube（3）It is nested.
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| CN201810065855.0A CN108413886A (en) | 2018-01-23 | 2018-01-23 | A kind of FBG encapsulating structures that can monitor soil body micro-strain and packaging method |
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| CN201810065855.0A CN108413886A (en) | 2018-01-23 | 2018-01-23 | A kind of FBG encapsulating structures that can monitor soil body micro-strain and packaging method |
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Cited By (6)
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| KR20190089181A (en) * | 2016-11-30 | 2019-07-30 | 호팅거 발트빈 메스테흐닉 게엠베하 | Welded FBG strain sensor device |
| CN111006607A (en) * | 2019-12-31 | 2020-04-14 | 山东科技大学 | Filling body transverse deformation on-line monitoring system based on fiber bragg grating sensing |
| CN111006605A (en) * | 2019-12-31 | 2020-04-14 | 山东科技大学 | Pre-buried type filling body transverse deformation measuring device based on fiber grating sensing |
| CN111006606A (en) * | 2019-12-31 | 2020-04-14 | 山东科技大学 | On-line monitoring system and monitoring method for deformation of filling body based on fiber bragg grating sensing |
| CN111044005A (en) * | 2019-12-31 | 2020-04-21 | 山东科技大学 | Pre-buried formula obturator lateral deformation measuring device |
| CN112344870A (en) * | 2020-11-02 | 2021-02-09 | 武汉理工大学 | High-temperature-resistant FBG strain sensor with temperature compensation and packaging method thereof |
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| CN111006606B (en) * | 2019-12-31 | 2021-01-05 | 山东科技大学 | On-line monitoring system and monitoring method for deformation of filling body based on fiber bragg grating sensing |
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| CN111044005B (en) * | 2019-12-31 | 2021-02-05 | 山东科技大学 | Pre-buried formula obturator lateral deformation measuring device |
| CN112344870A (en) * | 2020-11-02 | 2021-02-09 | 武汉理工大学 | High-temperature-resistant FBG strain sensor with temperature compensation and packaging method thereof |
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Application publication date: 20180817 |