CN203203568U - Fiber bragg grating vertical strain sensor - Google Patents
Fiber bragg grating vertical strain sensor Download PDFInfo
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- CN203203568U CN203203568U CN 201320118171 CN201320118171U CN203203568U CN 203203568 U CN203203568 U CN 203203568U CN 201320118171 CN201320118171 CN 201320118171 CN 201320118171 U CN201320118171 U CN 201320118171U CN 203203568 U CN203203568 U CN 203203568U
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- grating
- optical fiber
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- fiber
- vertical strain
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Abstract
The utility model specifically discloses a fiber bragg grating vertical strain sensor. The fiber bragg grating vertical strain sensor comprises a fixed base, a hollow supporting column, an optical fiber and a sensitive grating. The fixed base comprises an upper base and a lower base, the hollow supporting column is arranged between the upper base and the lower base, the sensitive grating is arranged on the optical fiber, and the sensitive grating is pasted onto the inner wall of the hollow supporting column. The optical fiber enters from the side surface of the upper base, passes through the hollow supporting column, and goes out from the side surface of the lower base. The portion of the optical fiber passing through the upper base and the lower base is provided with a temperature compensation grating, and two ends of the optical fiber are connected with an fiber bragg grating demodulation device. According to the grating vertical strain sensor, the material approximation between the sensor and the environment where the sensor is located is realized through the hollow supporting column, the base material strain distribution change caused by sensor implantation can be effectively avoided, and the measurement of the vertical strain of a roadbed material under an external force can be realized.
Description
Technical field
The utility model relates to sensory field of optic fibre, particularly a kind of vertical strain transducer of fiber grating for measuring the vertical strain of bituminous pavement.
Background technology
Since 20th century, the highway in China transport development advances with unprecedented speed.The road surface of China Higher level highway more than 95% is bituminous pavement, and its reason is that it has following many good performances: the mechanical strength that (1) is enough, bituminous pavement can bear well vehicular load and be applied to motive power on the road surface; (2) certain elasticity and plastic deformation ability can bearing loads and do not destroy; (3) better with the adhesion of doughnut, can guarantee traffic safety; (4) damping property of the height that brings of plastic property can make the automobile fast running, steadily and noiseless; (5) airborne dust not easily cleans and washes; (6) maintenance is easy, and the bituminous pavement reproducible utilization.But, we also should clearly realize that, because the construction of China Higher level highway is started late, the deposit of technical force is less, and economic base is relatively poor; And the weather of China and traffic loading inclement condition, overload of vehicle is serious, the reasons such as starting material insufficient investment such as the bi tumenf orr oad of high-quality, and also there is variety of problems in the asphalt pavement structure of making.Its construction level in some highway sections also is not so good as people's will, even the earlier period damage phenomenons such as rut, cracking, bellding, hole groove just occured in several years that are open to traffic, simultaneously owing to lacking advanced bituminous pavement monitoring equipment, therefore in case damage, just have to search reason by excavation, not only society, traffic have been caused very large impact, also caused economically very large loss, in recent years, how to prevent the disease of bituminous pavement to cause China road worker's great attention.Pavement damage is that many factors causes with joint efforts jointly, and some can draw reason by the observation analysis directly perceived on surface, but most of disease is derived from the acting in conjunction of the suffered various power of the following structure of surface layer, can't be by observation analysis reason directly perceived.Therefore, how to understand bituminous pavement and seem extremely important in the load transfer law between each structural sheet, strain rule under the different load actions, and these rules change often.So, for bituminous pavement, set up one and for a long time, effectively test and monitoring system, be a problem demanding prompt solution
In the bituminous pavement strain testing, resistance strain plate is dominate all the time, and is mainly used in having laid foil gauge on the theoretical validation pavement structure research section.The asphalt pavement structural layer strain testing generally is the method that adopts the test specimen piece directly to paste foil gauge, then buries the test specimen piece underground test position.Practice shows that said method has some shortcomings: the test specimen piece is difficult to be combined well with structural sheet, and moisture effect is poor, and the foil gauge solder joint easily comes off.Many experiment results proveds, the data that the strainometer that the build Experiment Road is buried underground records are more discrete.Vibrating string type strain transducer is tested because volume has no for Bituminous Pavement greatly.
In patent (201020609301.1), the vertical FBG strain transducer in a kind of flush type road surface is disclosed, it be by anchor head under anchor head, the metal on Fiber Bragg Grating FBG, optical fiber, fiber-reinforced resin, the metal, a left stable position toe, optical cable occur mouthful, right stable position toe and in a stable position toe.This utility model Fiber Bragg Grating FBG places fiber-reinforced resin inner, but it does not relate to the temperature compensation fiber grating, therefore the related sensor temperature influence of this utility model is larger.
The sensor remains in some problems for the bituminous pavement strain testing to be needed to solve.Sensor self modulus is high, size is large, has changed the original stress field of medium as an allosome, must also change strain field, has produced thus the deviation of test data.
The utility model content
In order to overcome the weak point of existing background technology, it is a kind of for measuring the vertical strain transducer of fiber grating that produces vertical strain under the roadbed External Force Acting that the utility model provides.
For realizing above purpose, the utility model adopts following technical proposals:
The vertical strain transducer of fiber grating, comprise fixed pedestal, interior hollow leg, optical fiber, responsive grating, described fixed pedestal comprises top base and bottom base, and interior hollow leg is located between top base and the bottom base, described responsive grating is located on the optical fiber, and described responsive grating sticks on the inwall of interior hollow leg, described optical fiber penetrates from the side of top base, pass interior hollow leg, pass from the side of bottom base, and the part optical fiber that passes top base, bottom base is provided with the temperature compensation grating, and the two ends of optical fiber link to each other with fiber Bragg grating (FBG) demodulator.
The side of described top base and the side of bottom base are in the same side of interior hollow leg.
Be inner right cylinder with hollow body at described interior hollow leg, responsive grating is pasted in the hollow body of interior hollow leg, and the outside surface of interior hollow leg is provided with protecting sheathing.
Described top base is connected with interior hollow leg by standing screw.
In described top base and bottom base, the part that optical fiber is drawn is provided with protecting component.
Be provided with directed bolt in the side of top base and the side of bottom base, realize the effect of protection Transmission Fibers.
The part of described optical fiber beyond pedestal and housing is enclosed with the armored optical cable shell.
Spot welding linked after described responsive grating passed through epoxy resin or grating plating with interior hollow leg.
The unsettled optical fiber crossover port that is positioned over the bottom of described temperature compensation grating.
In technique scheme, spot welding linked Effective Raise strain transfer coefficient after responsive grating passed through epoxy resin or grating plating with interior hollow leg; The temperature compensation grating is unsettled to be positioned over the interference of avoiding extraneous stress in the optical fiber crossover port of bottom.
In technique scheme, described interior hollow leg not only supports sensor, realize the transmission between extraneous strain and the fiber grating axial strain, can realize by the dutycycle that changes interior hollow leg intermediate gaps simultaneously that identical ambient pressure strain that lower sensor is surveyed and roadbed material strain coincide, reduce implanted sensor to the impact of roadbed material Strain Distribution.
In technique scheme, described standing screw is realized the sensor integral packaging; Directed screw rod protection sensor internal tail optical fiber realizes that the orientation of inner tail optical fiber is drawn, and is convenient to the networking of sensor.
In technique scheme, described optical fiber crossover port is realized the conversion of optical fiber trend, has effectively reduced the vertical height of sensor, and sensor can vertically be imbedded in the roadbed material.
In technique scheme, described sensor physical dimension only can directly vertically be embedded in the different layering roadbed materials this sensor for φ 20 * 30mm, effectively detects each layering of roadbed strain variation under external force.
The beneficial effects of the utility model are:
The vertical strain transducer of grating is realized the material proximate in sensor and bad border, place by interior hollow leg, effectively avoid bringing because of implanted sensor the change of base material Strain Distribution, has realized the measurement of the vertical strain of roadbed material under extraneous acting force.
Description of drawings
Fig. 1 is the vertical strain transducer cut-open view of the utility model fiber grating.
Fig. 2 is that the responsive grating initial center of the vertical strain transducer of fiber grating wavelength is the corresponding relation curve between 1535nm and centre wavelength and the strain.
1 fixed pedestal among the figure, 2 protecting sheathings, 3 interior hollow legs, 4 responsive gratings, 5 standing screws, 6 directed screw rods, 7 optical fiber are drawn protecting component, 8 armored optical cables, 9 tail optical fibers, 10 optical fiber crossover ports, 11 temperature compensation gratings, 12 top bases, 13 bottom bases, 14 optical fiber.
Embodiment
Be elaborated below in conjunction with accompanying drawing 1 and 2 pairs of the utility model of accompanying drawing:
The utility model is that the vertical strain transducer of fiber grating is mainly drawn protecting component 7, armored optical cable 8 and tail optical fiber 9 etc. by responsive grating 4, temperature compensation grating 11, fixed pedestal 1, protecting sheathing 2, interior hollow leg 3, standing screw 5, directed screw rod 6, optical fiber crossover port 10, optical fiber and formed.
Fixed pedestal 1 comprises top base 12 and bottom base 13; And interior hollow leg 3 is located between top base 12 and the bottom base 13, responsive grating 4 is located on the optical fiber 14, and described responsive grating 4 sticks on the inwall of interior hollow leg 3, and optical fiber 14 penetrates from the side of top base 12, pass interior hollow leg 3, pass from 13 sides of bottom base.The side of the side of top base 12 and bottom base 13 is in the same side of interior hollow leg 3.The outside of interior hollow leg 3 is provided with protecting sheathing 2.Top base 12 is connected with interior hollow leg 3 by standing screw 5.In top base 12 and the bottom base 13, the part that optical fiber 14 is drawn is provided with optical fiber and draws protecting component 7.Optical fiber 14 is provided with temperature compensation grating 11 with the part that top base 12, bottom base 13 contact.
The responsive grating 4 of this Sensor core sensitive element is linked in interior hollow leg 3 inwalls by epoxy resin or the gold-plated rear spot welding of grating, greatly improves the strain transfer coefficient between extraneous strain and optical fiber 14 strains.
Optical fiber crossover port 10 realize protection suspend with its in temperature compensation grating 11 avoid the impact of extraneous stress, effectively realize the purpose of temperature compensation, realize simultaneously the vertical height that greatly reduces this sensor that turns to of optical fiber 14.Therefore, this vertical sensor can be distributed in the roadbed different layers material, realizes effective detection of roadbed different layers material strain characteristic under the external stress effect.
Interior hollow leg 3 is inner right cylinder with hollow body, can realize that by the dutycycle of hollow leg 3 intermediate gaps in regulating strain transducer characteristic and roadbed material coincide, reduce implanted sensor to the impact of roadbed material Strain Distribution, thereby realize the accurate measurement of roadbed material emergent property.
During use this sensor is embedded in the roadbed material in advance the tail optical fiber 9 in the armored optical cable 8 protection foundation materials and the effective communication of realizing between Control Room and the sensor by tail optical fiber 9.Roadbed material generation deformation is delivered to extraneous effect of stress on the pedestal of vertical strain transducer when the ground roadbed is subject to the effect of extraneous stress.Sensor base is subject to the interior hollow leg 3 of pressing sensing device inside behind the extraneous effect of stress.Interior hollow leg 3 is subject to external influence power generation strain effect and drives the fiber bragg grating center wavelength variation.Centre wavelength by the vertical strain transducer of fiber Bragg grating (FBG) demodulator Real-time demodulation, the strain value that the fiber bragg grating center wavelength that gets by the transducer calibration data fitting and extraneous strain Relations Among curve equation inverting roadbed material produce under external force, thus realize the measurement of the vertical strain of roadbed.
Claims (9)
1. the vertical strain transducer of fiber grating, it is characterized in that: comprise fixed pedestal, interior hollow leg, optical fiber, responsive grating, described fixed pedestal comprises top base and bottom base, and interior hollow leg is located between top base and the bottom base, described responsive grating is located on the optical fiber, and described responsive grating sticks on the inwall of interior hollow leg, described optical fiber penetrates from the side of top base, pass interior hollow leg, pass from the side of bottom base, and pass top base, the part optical fiber of bottom base is provided with the temperature compensation grating, and the two ends of optical fiber link to each other with fiber Bragg grating (FBG) demodulator.
2. the vertical strain transducer of fiber grating as claimed in claim 1, it is characterized in that: the side of described top base and the side of bottom base are in the same side of interior hollow leg.
3. the vertical strain transducer of fiber grating as claimed in claim 1 is characterized in that: interior hollow leg is inner right cylinder with hollow body, and the outside surface of interior hollow leg is provided with protecting sheathing.
4. the vertical strain transducer of fiber grating as claimed in claim 1, it is characterized in that: described top base is connected with interior hollow leg by standing screw.
5. the vertical strain transducer of fiber grating as claimed in claim 1, it is characterized in that: in described top base and bottom base, the part that optical fiber is drawn is provided with protecting component.
6. the vertical strain transducer of fiber grating as claimed in claim 1, it is characterized in that: the part that contacts with top base, bottom base at described optical fiber is provided with the temperature compensation grating.
7. the vertical strain transducer of fiber grating as claimed in claim 1 is characterized in that: be provided with directed bolt in the side of top base and the side of bottom base, realize the effect of protection Transmission Fibers.
8. the vertical strain transducer of fiber grating as claimed in claim 1 is characterized in that: the part of described optical fiber beyond pedestal and housing is enclosed with the armored optical cable shell.
9. the vertical strain transducer of fiber grating as claimed in claim 1 is characterized in that: described responsive grating and interior hollow leg by epoxy resin or grating plating after spot welding link.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320118171 CN203203568U (en) | 2013-03-14 | 2013-03-14 | Fiber bragg grating vertical strain sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320118171 CN203203568U (en) | 2013-03-14 | 2013-03-14 | Fiber bragg grating vertical strain sensor |
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| Publication Number | Publication Date |
|---|---|
| CN203203568U true CN203203568U (en) | 2013-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320118171 Expired - Fee Related CN203203568U (en) | 2013-03-14 | 2013-03-14 | Fiber bragg grating vertical strain sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103148797A (en) * | 2013-03-14 | 2013-06-12 | 山东大学 | Fiber grating vertical strain sensor |
| CN112461153A (en) * | 2020-12-02 | 2021-03-09 | 南通装配式建筑与智能结构研究院 | Fiber grating strain sensor with temperature compensation function |
-
2013
- 2013-03-14 CN CN 201320118171 patent/CN203203568U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103148797A (en) * | 2013-03-14 | 2013-06-12 | 山东大学 | Fiber grating vertical strain sensor |
| CN103148797B (en) * | 2013-03-14 | 2016-05-11 | 山东大学 | The vertical strain transducer of fiber grating |
| CN112461153A (en) * | 2020-12-02 | 2021-03-09 | 南通装配式建筑与智能结构研究院 | Fiber grating strain sensor with temperature compensation function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130918 Termination date: 20140314 |