CN209432073U - Measure the coaxial multiple casing packaged fiber grating sensor of long gauge length of tension and compression strain - Google Patents
Measure the coaxial multiple casing packaged fiber grating sensor of long gauge length of tension and compression strain Download PDFInfo
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- CN209432073U CN209432073U CN201920355927.5U CN201920355927U CN209432073U CN 209432073 U CN209432073 U CN 209432073U CN 201920355927 U CN201920355927 U CN 201920355927U CN 209432073 U CN209432073 U CN 209432073U
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- fiber grating
- fiber
- short sleeve
- encapsulation
- long tube
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Abstract
The utility model is a kind of long gauge length coaxially multiple casing packaged fiber grating sensor, including bare fibre, fiber grating, short sleeve, fiber adhesive, encapsulation long tube, silicon rubber, half hard tube, wire jumper of measurement tension and compression strain；The fiber grating both ends are connect with bare fibre, and short sleeve is arranged with outside fiber grating, fiber adhesive is injected into inside short sleeve；The short sleeve both ends are connect with encapsulation long tube respectively by fiber adhesive；The end for encapsulating long tube uses silicone rubber seal；Bare fibre extends to outside encapsulation long tube through encapsulation long tube and silicon rubber.The utility model obtains axial strain in long gauge length by fiber grating, and monitoring range is big, high sensitivity, electromagnetism interference, corrosion-resistant, it can be achieved that the life cycle management of component strain monitors.The utility model is small in size and seals, and accommodative ability of environment is strong, is not only applicable to build, and can also be applied to the strain monitoring in terms of bridge.
Description
Technical field
The utility model is based on Fiber Bragg Grating technology, is a kind of long gauge length coaxially multiple casing encapsulation of measurement tension and compression strain
Fiber-optic grating sensor belongs to technical field of optical fiber sensing.
Background technique
During construction and operation, the monitoring of structural stress state is of great significance for heavy construction and bridge.Light
Fine Bragg grating (fiberBragg grating, FBG) sensor is the preferred sensor of monitoring structural health conditions, can be passed through
Changing to perceive the variation of strain and temperature for optical wavelength, has lot of advantages, such as precision height, small volume and less weight, bandwidth, spirit
Quick property is good, it is anti-interference it is strong, transmission loss is small, facilitates distribution and quasi-distributed measurement, and maintenance cost is low, be suitable for long-term prison
It surveys.But the FBG sensor in Practical Project is mostly point type or short gauge length sensor, measurement range is small, and measurement result cannot
Reflect the stress of total.Therefore, a kind of long gauge length FBG sensor of good performance is researched and developed, for long-term prison in real time
The strain for surveying bridge or building is of great significance.
Utility model content
The utility model relates to a kind of structure is simple, performance is stable, reliable, high sensitivity, electromagnetism interference, corrosion-resistant,
Sensor for the strain of long-term real-time monitoring building.
To achieve the goals above, the utility model, which solves the technical solution of technical problem, is:
A kind of coaxial multiple casing packaged fiber grating sensor of long gauge length of measurement tension and compression strain, which is characterized in that packet
Include bare fibre, fiber grating, short sleeve, fiber adhesive, encapsulation long tube, silicon rubber, half hard tube, wire jumper；The fiber grating
Both ends are connect with bare fibre, and short sleeve is arranged with outside fiber grating, and fiber adhesive is injected into inside short sleeve；It is described short
Casing both ends are connect with encapsulation long tube respectively by fiber adhesive；The end for encapsulating long tube uses silicone rubber seal；Bare fibre
It is extended to outside encapsulation long tube through encapsulation long tube and silicon rubber.
Compared with the prior art, the utility model has following advantages and effect:
1. life cycle management monitoring can be carried out to heavy construction or bridge.
The utility model obtains axial strain in long gauge length by fiber grating, and monitoring range is big, high sensitivity, anti-electromagnetism
Interference, it is corrosion-resistant, it can be achieved that the life cycle management of component strain monitors.
2. range is big, measurement accuracy is adjustable.
By structure design principle it is found that this sensor is since with long gauge length, range can increase according to specific requirement, full
Requirement in terms of sufficient civil engineering large scale structure measuring range.
3. arrangement is various, the utility model monitored position needed for both being directly arranged in, and can also be embedded in advance prefabricated
In component, survival rate of the sensor in construction monitoring can be improved.
4. applied widely, the utility model is small in size and seals, and accommodative ability of environment is strong, is not only applicable to build, also
It can be applied to the strain monitoring in terms of bridge.
Detailed description of the invention
Fig. 1 is short sleeve structural schematic diagram.
Fig. 2 is long gauge length optical fibre grating sensor overall schematic.
Fig. 3 is optical fiber and wire jumper connection schematic diagram.
Fig. 4 is short sleeve diagrammatic cross-section.
Specific embodiment
The utility model is described in further details with reference to the accompanying drawings and detailed description.The guarantor of the utility model
Shield range is not limited by specific example, is subject to claims.In addition, with without prejudice to technical solutions of the utility model
Under the premise of, any modifications or changes easy to accomplish to those of ordinary skill in the art made by the utility model fall within this
Within the scope of the claims of utility model.
A kind of long gauge length strain transducer based on fiber grating sensing technology, including bare fibre 1, fiber grating 2, short set
Pipe 3, fiber adhesive 4 (use 353ND glue), encapsulation long tube 5, silicon rubber 6 (using 704 glue), transparent half hard tube 7 of polyethylene,
Single mode single-core fiber wire jumper 8, connecting flange 9；
2 both ends of fiber grating are connect with bare fibre 1, and short sleeve 3 is arranged with outside fiber grating 2, optical fiber is bonded
Glue 4 is injected into inside short sleeve 3；
3 both ends of short sleeve are connect with encapsulation long tube 5 respectively by fiber adhesive 4；
The end for encapsulating long tube 5 is sealed using silicon rubber 6；Bare fibre 1 extends to envelope through encapsulation long tube 5 and silicon rubber 6
It fills outside long tube 5；
Bare fibre 1 is connect by transparent half hard tube 7 of polyethylene with single mode single-core fiber wire jumper 8, single mode single-core fiber wire jumper 8
End is equipped with connecting flange 9.
Fig. 1, the utility model short sleeve shown in 2,3 encapsulate grating fibers wherein, flat in optics in encapsulation process
Its pretension is given on platform, is made sensor that can both measure stretching strain, can also be measured compressive strain.With 353ND glue by fiber grating
It is fixed with short sleeve.Short sleeve both ends are connected with long encapsulation casing, and long casing length L depends on gauge length, and thus gauge length is long
Degree is 2L+h.Long encapsulation casing is fixedly connected with short sleeve equally using 353ND glue, and glue is applied in long encapsulation casing in advance
Portion, it is to be heated to be inserted in short sleeve to after there is mobility, it heats 1-2 minutes.The Seal treatment at long encapsulation casing both ends uses
704 glue.Optical fiber is kept to have certain relaxation when encapsulation, this glue elasticity modulus is small, and external fiber will not be made by encapsulating both ends with it
Stress transfer is to inside, to guarantee the accuracy of fiber grating measurement.The bare fibre that finally both ends are stretched out and wire jumper welding, then
Interface is inserted in transparent half hard tube of polyethylene to shield.The wire jumper other end has connecting flange, can be connected with (FBG) demodulator.Such as
Described in Fig. 4.To prevent the disturbing influence fiber grating strain of optical fiber from changing, both ends fiber slack shape should be kept when both ends encapsulate
State, gap-filling glue use 704 glue.Finally, packaged fiber grating sensor and wire jumper welding are made by polyethylene transparent half hard tube
Make long gauge length optical fibre grating strain transducer.
Working principle of the utility model is:
Assuming that sensor and measured structure bonding are good, no relative displacement and is described as follows the detailed derivation of equation:
δ0For small casing fiber grating partial dislocation, δ1For two root long casing total displacements, ε0, ε1To strain accordingly, E0,E1
For corresponding elasticity modulus, A0,A1For corresponding cross-sectional area
Total displacement δ=the δ at gauge length both ends0+δ1=ε0h+2ε1L
Casing each point stress is identical, therefore:
Fiber grating strain is
Mean strain
Assuming that:ThenWherein, η is known as amplification coefficient.
Actual strain is that fiber grating measures strain stress0With the product of amplification coefficient η.
Claims (2)
1. a kind of coaxial multiple casing packaged fiber grating sensor of long gauge length of measurement tension and compression strain, which is characterized in that including
Bare fibre, fiber grating, short sleeve, fiber adhesive, encapsulation long tube, silicon rubber, half hard tube, wire jumper；
The fiber grating both ends are connect with bare fibre, and short sleeve is arranged with outside fiber grating, fiber adhesive is injected into
Inside short sleeve；
The short sleeve both ends are connect with encapsulation long tube respectively by fiber adhesive；
The end for encapsulating long tube uses silicone rubber seal；Bare fibre extends to outside encapsulation long tube through encapsulation long tube and silicon rubber
Portion.
2. a kind of coaxial multiple casing packaged fiber grating sensing of long gauge length of measurement tension and compression strain according to claim 1
Device, which is characterized in that bare fibre is connect by half hard tube with wire jumper, and wire jumper end is equipped with connecting flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920355927.5U CN209432073U (en) | 2019-03-20 | 2019-03-20 | Measure the coaxial multiple casing packaged fiber grating sensor of long gauge length of tension and compression strain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920355927.5U CN209432073U (en) | 2019-03-20 | 2019-03-20 | Measure the coaxial multiple casing packaged fiber grating sensor of long gauge length of tension and compression strain |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209432073U true CN209432073U (en) | 2019-09-24 |
Family
ID=67978758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920355927.5U Expired - Fee Related CN209432073U (en) | 2019-03-20 | 2019-03-20 | Measure the coaxial multiple casing packaged fiber grating sensor of long gauge length of tension and compression strain |
Country Status (1)
| Country | Link |
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| CN (1) | CN209432073U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109813245A (en) * | 2019-03-20 | 2019-05-28 | 沈阳建筑大学 | Measure the coaxial multiple casing packaged fiber grating sensor of long gauge length of tension and compression strain |
| CN111780707A (en) * | 2020-06-06 | 2020-10-16 | 河南交院工程技术有限公司 | Strain measuring device |
| CN111780708A (en) * | 2020-06-06 | 2020-10-16 | 河南交院工程技术有限公司 | Strain gauge |
-
2019
- 2019-03-20 CN CN201920355927.5U patent/CN209432073U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109813245A (en) * | 2019-03-20 | 2019-05-28 | 沈阳建筑大学 | Measure the coaxial multiple casing packaged fiber grating sensor of long gauge length of tension and compression strain |
| CN111780707A (en) * | 2020-06-06 | 2020-10-16 | 河南交院工程技术有限公司 | Strain measuring device |
| CN111780708A (en) * | 2020-06-06 | 2020-10-16 | 河南交院工程技术有限公司 | Strain gauge |
| CN111780708B (en) * | 2020-06-06 | 2021-12-14 | 河南交院工程技术集团有限公司 | Strain gauge |
| CN111780707B (en) * | 2020-06-06 | 2021-12-14 | 河南交院工程技术集团有限公司 | Strain measuring device |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190924 Termination date: 20210320 |