CN101055170A - Replaceable embedding type optical fiber strain sensor - Google Patents
Replaceable embedding type optical fiber strain sensor Download PDFInfo
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- CN101055170A CN101055170A CN 200710041483 CN200710041483A CN101055170A CN 101055170 A CN101055170 A CN 101055170A CN 200710041483 CN200710041483 CN 200710041483 CN 200710041483 A CN200710041483 A CN 200710041483A CN 101055170 A CN101055170 A CN 101055170A
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- sleeve pipe
- stainless steel
- steel substrates
- fiber grating
- strain
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Abstract
A replaceable embedding strain sensor which belongs to civil engineering technical field includes a hollow tube type casing, several strain sensors disposed in the casing, a via hole opened in a side surface of bottom end of the casing; the stain sensor comprises a stainless steel sheet clung to the outer surface of casing, a fiber grating with the top end connected with one end of the transmission fiber and the bottom end connected fixedly with the stainless steel sheet outside of the casing through the via hole, a transmission fiber with another end extended out of the casing. The invention is capable of replacing the ageing strain sensor, so as to satisfy the demand of long term monitoring, and is applicable for the concrete and rebar in structure.
Description
Technical field
What the present invention relates to is a kind of sensor of technical field of civil engineering, is specifically related to a kind of removable flush type strain transducer.
Background technology
Fibre optic strain sensor has become the substitute of traditional resistor foil gauge because the performance of self excellence, is widely used in the monitoring of reinforced concrete structure key position force-bearing situations such as large bridge, dam, tunnel, important building.But the stability and the reliability of at present general fibre optic strain sensor only can be kept about 15 years, much smaller than the serviceable life that reinforced concrete structure is generally decades even goes up a century.Therefore in the process of structure monitoring, unavoidable to the replacing of sensor.Though it is multiple that the design of at present relevant embedding type optical fiber strain sensor has, and do not possess the replacing function.In addition, existing sensor all can only be used for the monitoring of concrete strain, and is not suitable for the reinforcing bar in the reinforced concrete structure.
Find by prior art documents; Chinese patent; application number: 01129192.3; patent name: " buried optical fibre strain sensor for concrete structure "; a kind of embedding type optical fiber strain sensor that can be used for reinforced concrete structure is disclosed; its structure comprises disrance sleeve; the resilient seal linkage section; bare fibre strain sensing device and draw optical fiber etc.; its defective is: the protection problem of only paying attention to having solved sensor; and do not consider the replacing problem; in case sensor reaches and has just lost the ability that continues monitoring serviceable life; this outer sensor can only be used for the monitoring of concrete strain, and is not suitable for the reinforcing bar in the reinforced concrete structure.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, a kind of removable embedding type optical fiber strain sensor is provided.The present invention can be after the strain sensing device is aging changes satisfying the needs of long term monitoring it, and is applicable to concrete and reinforcing bar that structure is interior simultaneously.
The present invention is achieved by the following technical solutions, the present invention includes: sleeve pipe, strain sensing device, sleeve pipe are hollow tubular, and the strain sensing device places in the sleeve pipe, offer hole on the either side surface, bottom of sleeve pipe; Described strain sensing device comprises: stainless steel substrates, fiber grating, Transmission Fibers; Stainless steel substrates is close to bushing outer surface, and the upper end of fiber grating links to each other with an end of Transmission Fibers, the stainless steel substrates concrete mutually of the base terminal of fiber grating outside hole and sleeve pipe, and the other end of Transmission Fibers stretches out outside the sleeve pipe.
Described sleeve pipe, end sealing, the other end is an opening, openend is provided with activity and seals.The function of sleeve pipe is inner fiber grating and the Transmission Fibers of protection and location.
Described sleeve pipe, its xsect is a rectangle.
Described stainless steel substrates is positioned at the outside surface of sleeve pipe, be close to the hole of sleeve pipe, and area is greater than the area of hole.Stainless steel substrates as the substrate of fiber grating, is used for the directly monitored target (concrete or reinforcing bar) of contact, responds to its strain.
The stainless steel substrates concrete mutually of the base terminal of described fiber grating outside hole and sleeve pipe is meant: in the hole place by the stainless steel substrates concrete mutually outside epoxy resin and the sleeve pipe.Fiber grating places in the sleeve pipe, by the stainless steel substrates concrete mutually outside epoxy resin and the sleeve pipe, is used for responding to the external strain that stainless steel substrates transmits in the hole place.
Described Transmission Fibers, an end places in the sleeve pipe, connects fiber grating, and the other end is positioned at outside the sleeve pipe, and signal is transferred to outside light signal demodulating equipment.
The present invention is at first, to press above explanation with each component packages cost strain transducer for the working mechanism of realizing strain monitoring.Before casting concrete, it is imbedded in the structure, make stainless steel substrates be positioned at the position of strain to be measured.If position to be measured is a concrete, then after the concreting, inner Binder Materials will make the concrete of stainless steel substrates and position to be measured realize collaborative work.If position to be measured is a reinforcing bar, then need earlier stainless steel substrates to be consolidated in the position to be measured on the reinforcing bar, realize collaborative work.
The collaborative work of stainless steel substrates and position to be measured will make it can sense the strain that position to be measured takes place, then it is passed to from one's body fixed fiber grating, cause the variation of the inner transducing signal of fiber grating, this variation is delivered to outside light signal demodulating equipment by Transmission Fibers, can obtain the information of strain after analyzing.So just realized treating the strain monitoring of surveying the position.
The present invention realizes that the working mechanism of replaceable strain sensing device is: when the fiber grating that is used for strain sensing and Transmission Fibers take place aging after, opening the activity of sleeve pipe upper end seals, the solvent of injection ring epoxy resins in sleeve pipe (the most frequently used is acetone), epoxy resin after immersion a period of time between solubilized fiber grating and the stainless steel substrates, fiber grating is come off, then it is pulled out in sleeve pipe with Transmission Fibers; Inject acetone in order to cannula cleaning inside, treat after acetone volatilizees naturally new fiber grating and new Transmission Fibers to be connected, smeared epoxy resin, then it is stretched into sleeve pipe, arrive the position of stainless steel substrates at the basal surface of grating.Thin bar is stretched into sleeve pipe, apply effect to fiber grating, make it be affixed to stainless steel substrates, the effect of epoxy resin will make itself and stainless steel substrates bond together; Seal the sealing of ferrule openings end with activity at last, new fiber grating recovers operate as normal again.Because the stainless steel substrates self performance is stable, the life-span is long, so do not need to change with fiber grating and Transmission Fibers.After fiber grating after this is changed wears out with Transmission Fibers, the samely change operation again, thereby guaranteed the long-term continuity of strain monitoring.
The most outstanding advantage of the present invention is that (1) can realize the replacement to embedded-type sensor, guarantees can carry out strain monitoring in by the whole operating period of geodesic structure; (2) can in a sleeve pipe, arrange and obtain a plurality of data simultaneously by a plurality of strain sensing devices; (3) can be applicable to reinforcing bar and the concrete that xoncrete structure is interior simultaneously; (4) because Fibre Optical Sensor is very small, the external diameter of overlay is less than one millimeter, and therefore the controllable diameter of this sleeve pipe can be ignored concrete stress distribution influence built in the millimeter level; (5) be applicable to dissimilar fibre-optical sensing devices, as intensity type, interfere type and Bragg grating type; (6) replacement operation of sensor is easier to be reliable.
Description of drawings
Fig. 1 is the front elevation (structural representation) of strain sensing device of the present invention.
Fig. 2 is the A-A sectional view (structural representation) of Fig. 1.
Fig. 3 is the vertical view (structural representation) of Fig. 1.
Transducer arrangements synoptic diagram when Fig. 4 surveys concrete strain for embodiment.
Transducer arrangements synoptic diagram when Fig. 5 surveys the reinforcing bar strain for embodiment.
Embodiment
Below embodiments of the invention are elaborated: present embodiment has provided detailed embodiment and process being to implement under the prerequisite with the technical solution of the present invention, but protection scope of the present invention is not limited to following embodiment.
Present embodiment comprises: sleeve pipe 1, strain sensing device, and sleeve pipe 1 is a hollow tubular, and the strain sensing device places in the sleeve pipe 1, offers hole on the either side surface, bottom of sleeve pipe 1, and the strain sensing device comprises: stainless steel substrates 2, fiber grating 3, Transmission Fibers 4; Stainless steel substrates 2 is close to sleeve pipe 1 outside surface, and the upper end of fiber grating 3 links to each other with an end of Transmission Fibers 4, stainless steel substrates 2 concrete mutuallies of the base terminal of fiber grating 3 outside hole and sleeve pipe 1, and the other end of Transmission Fibers 4 stretches out outside the sleeve pipe 1.
At first determine the distance of strain tested point to the concrete outside surface, get one then and be slightly larger than the length of the numerical value of this value as rectangle sleeve pipe 1, lower position in a side of sleeve pipe 1 is opened a hole, and the area of this hole is greater than the area of fiber grating 3, but less than the area of stainless steel substrates 2.Fiber grating 3 and Transmission Fibers 4 are connected, and Transmission Fibers 4 is external in demodulated equipment.The outside surface of stainless steel substrates 2 from sleeve pipe 1 is affixed on the hole, then fiber grating 3 stretched in the sleeve pipe 1, be consolidated on the stainless steel substrates 2 by epoxy resin 6.At last load onto activity and seal 7 at the openend of sleeve pipe 1.When being used to survey the strain of concrete eight,, also can make asperities or corrugated fluctuating in stainless steel substrates 2 one side outwardly in order to strengthen the cooperative work performance between stainless steel substrates 2 and the concrete eight.Sensor construction after the encapsulation is shown in accompanying drawing 1,2,3.The direction shown in the arrow is should changing direction of being surveyed in the accompanying drawing 1.
Sensor during the strain of monitoring concrete eight is installed and is changed operation:
Before deposit concrete 8, this sensor after the encapsulation is fixed near the position of strain to be measured, makes sleeve pipe 1 openend be positioned at external surface of structural member, the position of stainless steel substrates 2 is corresponding to specifying measuring point, the sensing direction of fiber grating 3 is corresponding to the direction of strain to be measured, as shown in Figure 4.
When deposit concrete 8, sensor is protected with taking out the pipe method.What is called is taken out the pipe method, is with the steel pipe of a slightly larger in diameter in the sensor section width its suit to be protected, just as vertical muscle is fixed in the concrete section.When pouring into a mould, wait to vibrate to finish afterwards sleeve pipe is extracted out, sensor is stayed original position.Steel pipe can well protect sensor to avoid the interference of extraneous adverse environment.After concrete depositing was finished, sensor was embedded in assigned address, and stainless steel substrates 2 will closely contact with concrete eight on every side owing to be positioned at jacket exterior.
In normal operational phase, stainless steel substrates 2 will be sensed the strain at place, position, and it is delivered on the fiber grating 3, can obtain the strain value at this place then by Transmission Fibers 4 and outside demodulated equipment 5.
When this fiber grating 3 and Transmission Fibers 4 take place aging after, change operation as follows:
Open the activity of sleeve pipe 1 upper end and seal 7, the solvent of injection ring epoxy resins in sleeve pipe 1 (ketone, ester class, ethers and chlorinated hydrocarbon, the most frequently used is acetone), epoxy resin 6 after immersion a period of time between solubilized fiber grating 3 and the stainless steel substrates 2, fiber grating 3 is come off, then it is pulled out with Transmission Fibers 4.With acetone cannula cleaning inside, treat that acetone volatilizees naturally after, new fiber grating 3 and new Transmission Fibers 4 are connected, smeared epoxy resin in fiber grating 3 bottom surfaces, then it is stretched into sleeve pipe 1, arrive the position of stainless steel substrates 2.Then thin bar is stretched into sleeve pipe 1, apply effect for fiber grating 3, make it be affixed to stainless steel substrates 2, and bond together by the effect of epoxy resin.Sleeve pipe 1 openend is sealed 7 sealings with activity.New fiber grating 3 beginning operate as normal.
Under the situation of the strain of monitoring of structures inner concrete 8, present embodiment has been realized the replacement to embedded-type sensor, and replacement operation is easy to be reliable.After fiber grating 3 and Transmission Fibers 4 are aging again, can the samely change operation, thereby guarantee the long-term continuity of strain monitoring, in by the whole operating period of geodesic structure, can monitor.
Sensor during 9 strains of monitoring reinforcing bar is installed and is changed operation:
Before deposit concrete, the stainless steel substrates 2 that sleeve pipe 1 is outer is consolidated in the position to be measured on the reinforcing bar 9, and the sensing direction of fiber grating 3 is corresponding to the direction of strain to be measured, as shown in Figure 5.
When deposit concrete, with taking out the pipe method sensor is protected equally.
In normal operational phase, stainless steel substrates 2 will be sensed the strain of place, position reinforcing bar 9, and it is delivered on the fiber grating 3, can obtain the strain value at this place by transmission grids 4 and demodulated equipment 5.
When this fiber grating 3 and Transmission Fibers 4 take place aging after, the same step during by the strain of monitoring concrete eight is changed operation.
Under the situation of the strain of reinforcing bar 9, present embodiment has been realized the replacement to embedded-type sensor in monitoring of structures, and replacement operation is easy to be reliable.After fiber grating 3 and Transmission Fibers 4 are aging again, can the samely change operation, thereby guarantee the long-term continuity of strain monitoring, in by the whole operating period of geodesic structure, can monitor.
Claims (6)
1. removable flush type strain transducer, comprise: sleeve pipe, strain sensing device, sleeve pipe is a hollow tubular, the strain sensing device places in the sleeve pipe, it is characterized in that, offer hole on the either side surface, bottom of sleeve pipe, described strain sensing device comprises: stainless steel substrates, fiber grating, Transmission Fibers, stainless steel substrates is close to bushing outer surface, the upper end of fiber grating links to each other with an end of Transmission Fibers, the stainless steel substrates concrete mutually of the base terminal of fiber grating outside hole and sleeve pipe, the other end of Transmission Fibers stretches out outside the sleeve pipe.
2. removable flush type strain transducer as claimed in claim 1 is characterized in that, described sleeve pipe one end sealing, and the other end is an opening, openend is provided with activity and seals.
3. removable flush type strain transducer as claimed in claim 1 or 2 is characterized in that, described sleeve pipe, and its xsect is a rectangle.
4. removable flush type strain transducer as claimed in claim 1 is characterized in that, described stainless steel substrates is positioned at the outside surface of sleeve pipe, is close to the hole of sleeve pipe.
5. removable flush type strain transducer as claimed in claim 4 is characterized in that, described stainless steel substrates, and its area is greater than the area of hole.
6. removable flush type strain transducer as claimed in claim 1 is characterized in that, the stainless steel substrates concrete mutually of the base terminal of described fiber grating outside hole and sleeve pipe is meant: in the hole place by the stainless steel substrates concrete mutually outside epoxy resin and the sleeve pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200710041483XA CN100449261C (en) | 2007-05-31 | 2007-05-31 | Replaceable embedding type optical fiber strain sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200710041483XA CN100449261C (en) | 2007-05-31 | 2007-05-31 | Replaceable embedding type optical fiber strain sensor |
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| Publication Number | Publication Date |
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| CN101055170A true CN101055170A (en) | 2007-10-17 |
| CN100449261C CN100449261C (en) | 2009-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB200710041483XA Expired - Fee Related CN100449261C (en) | 2007-05-31 | 2007-05-31 | Replaceable embedding type optical fiber strain sensor |
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| CN (1) | CN100449261C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102102537A (en) * | 2010-12-20 | 2011-06-22 | 中铁隧道集团有限公司 | Tunnel surrounding rock radial stress strain distributed monitoring technology |
| CN102252956A (en) * | 2011-04-29 | 2011-11-23 | 大连理工大学 | Distributed optical fiber rust sensor with non-interference with rust interface |
| CN102928580A (en) * | 2012-11-20 | 2013-02-13 | 郑州大学 | Corrosion monitoring device and method for reinforcement bar in concrete structure |
| CN103076063A (en) * | 2013-01-21 | 2013-05-01 | 南京理工大学 | Optical fiber grating water and soil interface sensor and manufacturing and installation method thereof |
| CN103217109A (en) * | 2013-04-09 | 2013-07-24 | 河海大学 | Crack monitoring sensor and use method thereof based on OTDR (optical time domain reflectometry) technique |
| CN108007333A (en) * | 2017-11-21 | 2018-05-08 | 中国矿业大学 | A kind of strata displacement monitoring device and monitoring method |
| CN112576245A (en) * | 2020-12-09 | 2021-03-30 | 中国石油大学(华东) | Distributed optical fiber strain monitoring method based on crack propagation simulation |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2525505Y (en) * | 2001-12-12 | 2002-12-11 | 重庆大学 | Concrete structure buried optical fibre strain sensitive head |
| CN2550719Y (en) * | 2002-05-30 | 2003-05-14 | 欧进萍 | Optical fiber and grating sheet type package strainometer |
| CN2636238Y (en) * | 2003-07-03 | 2004-08-25 | 香港理工大学 | Cement structure strain measuring sensor with temp. compensation |
| CN2651704Y (en) * | 2003-11-04 | 2004-10-27 | 刘育梁 | Fibre-optic raster strain sensor |
| CN1316227C (en) * | 2005-09-30 | 2007-05-16 | 大连理工大学 | Optical fiber grating displacement sensor |
-
2007
- 2007-05-31 CN CNB200710041483XA patent/CN100449261C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102102537A (en) * | 2010-12-20 | 2011-06-22 | 中铁隧道集团有限公司 | Tunnel surrounding rock radial stress strain distributed monitoring technology |
| CN102252956A (en) * | 2011-04-29 | 2011-11-23 | 大连理工大学 | Distributed optical fiber rust sensor with non-interference with rust interface |
| CN102928580A (en) * | 2012-11-20 | 2013-02-13 | 郑州大学 | Corrosion monitoring device and method for reinforcement bar in concrete structure |
| CN103076063A (en) * | 2013-01-21 | 2013-05-01 | 南京理工大学 | Optical fiber grating water and soil interface sensor and manufacturing and installation method thereof |
| CN103076063B (en) * | 2013-01-21 | 2014-12-17 | 南京理工大学 | Optical fiber grating water and soil interface sensor and manufacturing and installation method thereof |
| CN103217109A (en) * | 2013-04-09 | 2013-07-24 | 河海大学 | Crack monitoring sensor and use method thereof based on OTDR (optical time domain reflectometry) technique |
| CN103217109B (en) * | 2013-04-09 | 2016-11-23 | 河海大学 | A kind of Crack Monitoring sensor based on OTDR technique and using method thereof |
| CN108007333A (en) * | 2017-11-21 | 2018-05-08 | 中国矿业大学 | A kind of strata displacement monitoring device and monitoring method |
| CN112576245A (en) * | 2020-12-09 | 2021-03-30 | 中国石油大学(华东) | Distributed optical fiber strain monitoring method based on crack propagation simulation |
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| CN100449261C (en) | 2009-01-07 |
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Granted publication date: 20090107 Termination date: 20110531 |