CN202974524U - High sensitivity fiber bragg grating soil pressure gauge - Google Patents
High sensitivity fiber bragg grating soil pressure gauge Download PDFInfo
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- CN202974524U CN202974524U CN 201220633684 CN201220633684U CN202974524U CN 202974524 U CN202974524 U CN 202974524U CN 201220633684 CN201220633684 CN 201220633684 CN 201220633684 U CN201220633684 U CN 201220633684U CN 202974524 U CN202974524 U CN 202974524U
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Abstract
The utility model relates to a high sensitivity fiber bragg grating soil pressure gauge, comprising a housing, one end of the housing and a circular disc end cover are in a threaded connection, the other end is in a rigid connection with a corrugated diaphragm via an annular fastening loop; a dowel bar is inserted in the center of the corrugated diaphragm, one end of the dowel bar is connected with a fixed disc comprising an edge with a groove, the other end is in a threaded connection with the center of a circular bearing disc; the wall of the housing is provided with two groups of via holes, one group is used for insertion of a steel rod connected with a miniature bearing, and the other is a fiber lead-out hole; a measuring grating is connected with a steel wire via a colloid, the steel wire goes by the miniature bearing and is connected with the fixed disc, two ends of a temperature compensating grating are connected on a temperature compensating fixed seat fixed at a side wall of the housing, the temperature compensating grating is in a series connection with the measuring grating, and via the fiber lead-out hole, fibers are led out from two ends. The high sensitivity fiber bragg grating soil pressure gauge is advantaged by high sensitivity, good stability, strong anti-interference capability, good waterproof performance, and capability of realizing multi-point real-time quasi-distribution type monitoring.
Description
Technical field
The utility model relates to a kind of high-sensitivity optical fiber grating earth pressure gauge with temperature self-compensation function, a kind of can be used in geomechanical model test and civil engineering work particularly, the Changing Pattern of the soil pressure in the solid dielectrics such as rock mass and the soil body is carried out earth pressure gauge real-time, quasi-distributed monitoring.
Background technology
Banket, in the civil engineering work such as roadbed, dykes and dams, Hui Ba, soft base and geomechanical model test, the solid dielectric pressure such as rock mass or the soil body are important engineering parameters.Diaphragm structure is adopted in the measurement of soil pressure parameter at present more, and mostly use the electric class soil pressure sensors such as resistance-strain type, type vibration wire, such sensor accuracy based on electric signal is low, be subject to electromagnetic interference (EMI), water resistance is poor, long-term stability in use is poor, and is difficult for networking and carries out monitoring with distributed parameter.
Fiber grating is a kind of optical passive component to temperature and strain sensitive, it is highly sensitive, fast response time, wide dynamic range, lightweight, flexible structure, anticorrosive, high temperature resistant, anti-electromagnetic interference (EMI), water resistance is good and can work in the rugged surroundings such as inflammable and explosive without electric spark hidden danger, simultaneously, fiber-optic grating sensor adopts Wavelength-encoding, be not subjected to that in transmitting procedure, strength signal affects, good stability, antijamming capability is strong; And be convenient to consist of optical fiber sensing network and realize quasi-distributed measurement.soil pressure sensor based on fiber grating, its key is will be converted into the axial strain of fiber grating along fiber grating soil pressure radially by certain structure, existing fiber grating earth pressure sensor is the modes that adopt diaphragm to combine with semi-girder or free beam when addressing this problem more, perhaps adopt the structure identical with this class formation principle, the displacement at diaphragm center is converted to the surface strain of beam, this mode can cause optical fiber to produce bending or unbalance stress under stress, produce even chirp phenomenon of intensity loss, and sensitivity is low, can't satisfy the demand of high-sensitivity measurement in engineering and test.
The utility model content
Based on above-mentioned analysis, the utility model provides a kind of measurement highly sensitive, good stability, antijamming capability is strong, water resistance is good, can realize the real-time quasi-distributed monitoring of multiple spot, and can not cause the grating unbalance stress and high-sensitivity optical fiber grating earth pressure gauge that measurement result is exerted an influence.
For achieving the above object, the utility model adopts following technical proposals:
A kind of high-sensitivity optical fiber grating earth pressure gauge, comprise shell, pressure-sensitive component, pressure measurement unit and shaft collar, described pressure-sensitive component, pressure measurement unit, shaft collar are located in the protection housing, and the upper end of described housing is provided with bearing disc, and two groups of via holes are arranged on housing wall; Described pressure-sensitive component comprises convoluted diaphragm, transmission rod, and described convoluted diaphragm is horizontally through transmission rod, and the two ends of convoluted diaphragm and housing be rigidly connected, and transmission rod one end is connected with shaft collar, and the other end is connected with the bearing disc center; Described pressure measurement unit comprises bearing, steel wire, measurement grating and optical fiber, the central shaft of described bearing passes one group of via hole of housing wall, another group via hole on housing wall is passed at the two ends of described optical fiber, measuring grating scribes on optical fiber, measuring grating one end is connected with steel wire, the other end is fixed on the optical fiber fairlead, and described steel wire is walked around bearing and is connected with shaft collar.
Described housing is cylindrical cavity, and the lower end of housing is provided with the disk end cap, and the two ends of described convoluted diaphragm are rigidly connected by annular tight loop and housing, and described measurement grating one end is connected by colloid with steel wire.
Described bearing disc core is outstanding to the inside, and the outshot of bearing disc is provided with coordinate with transmission rod blind threaded.
Described bearing is provided with for the groove of placing steel wire, and the central shaft of bearing is fixed on housing, and also there is coordinate with transmission rod blind threaded at described shaft collar center, and the shaft collar edge has for the fixing groove of steel wire; Described steel wire is walked around in the groove that miniature bearing is bonded in shaft collar.
Described transmission rod two ends diameter is less than the middle part diameter, and two ends all are threaded.
The described convoluted diaphragm center of circle is provided with via hole, via hole internal diameter and transmission rod thread end external diameter coupling, and less than diameter in the middle part of transmission rod.
Described bearing disc, convoluted diaphragm, shaft collar three are concentric.
The center line of described two groups of via holes is mutually vertical, and the center line of two groups of via holes is with respect to housing center line eccentric setting, and described bearing is miniature bearing.
Device also comprises annular tight loop, and described annular tight loop is connected with outer casing screw, is provided with rubber seal between described annular tight loop and bearing disc.
Device also comprises the temperature compensation grating, temperature compensation grating and side amount grating are two gratings scribing on same optical fiber, and two gratings are in series, and described temperature compensation grating two ends are connected to be fixed on housing sidewall, the temperature compensation grating is bending, and with the both sides of measuring grating and be distributed in central shaft.
High-sensitivity optical fiber grating earth pressure gauge of the present utility model comprises housing, and housing sidewall has two groups of via holes, one group of steel pole that is used for installing with miniature bearing, and another group is used for drawing optical fiber.Housing one end clutch disk end cap, the other end is rigidly connected by annular tight loop and convoluted diaphragm.Screwed transmission rod passes via hole and the pressure-bearing disc centre at convoluted diaphragm center and fixes, and the other end of transmission rod connects the shaft collar that the edge has groove.Measure grating and connect with the temperature compensation grating, the optical fiber between steel wire one end and two gratings glueds joint, and the other end is walked around with reeded miniature bearing and is glued in the groove of shaft collar.Temperature compensation grating two ends are fixed on the temperature compensation grating holder that is placed in housing sidewall, optical fiber micro-bending between two.Be provided with rubber seal between annular tight loop and bearing disc, optical fiber is drawn from the optical fiber fairlead of housing wall both sides.
In use earth pressure gauge is embedded in the free field stress or the surface pressing that directly measure solid dielectric in the solid dielectrics such as works surface or the rock mass soil body.The pressure-bearing disk of rigidity and medium contact are experienced ambient pressure and are avoided the stress distribution of bearing disc upper surface uneven, do not consider the rubber seal pressure, ambient pressure is converted into concentrated force by transmission rod and all acts on the convoluted diaphragm center and make the convoluted diaphragm center produce displacement, thereby produce pulling force at an end that glueds joint in the shaft collar steel wire, the miniature bearing that this pulling force passes through is converted into the axial stress of measuring grating, thereby causes the drift of measuring the raster center wavelength.The temperature compensation grating is used for the compensate for ambient temperature, not affected by pulling force.Rubber seal contacts with bearing disc, prevents that in measuring process, solid dielectric enters earth pressure gauge internal influence measurement result.Use the optic fiber grating wavelength (FBG) demodulator to detect the centre wavelength of measuring grating and temperature compensation grating, analyze data by software collection, obtain the corresponding relation of tested soil pressure and centre wavelength.
The beneficial effects of the utility model are: it adopts the rigidity bearing disc as the once force-bearing parts, the stress distribution of having avoided diaphragm deformation to cause is uneven, adopt convoluted diaphragm as the secondary loading parts, and the diaphragm the center displacement is converted into the axial strain of measuring grating, highly sensitive, built-in temperature compensation grating can be used for compensate for temperature effects.The utility model is based on full optical signal design, good stability, and anti-electromagnetic interference (EMI), water resistance is good and without electric spark hidden danger, is convenient to realize quasi-distributed multiple spot Real-Time Monitoring.
Description of drawings
Fig. 1 is the elevation cross-sectional view of the utility model high-sensitivity optical fiber grating earth pressure gauge;
Fig. 2 be the utility model high-sensitivity optical fiber grating earth pressure gauge overlook the cross-section structure sketch;
1. bearing discs in figure, 2. annular tight loop, 3. O-ring seal, 4. housing, 5. disk end cap, 6. convoluted diaphragm, 7. measurement grating, 8. temperature compensation grating, 9. steel pole, 10. steel wire, 11. miniature bearings, 12. shaft collar, 13. transmission rods, 14. temperature compensation grating holders, 15. optical fiber, 16. optical fiber fairleads.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described further.
In Fig. 1, Fig. 2, housing 4 sidewalls have two groups of via holes, one group of steel pole 9 that is used for installing with miniature bearing 11, and another group is used for drawing optical fiber 15.Housing 4 one end clutch disk end caps 5, the other end is rigidly connected with convoluted diaphragm 6 by annular tight loop 2.Screwed transmission rod 13 passes via hole and pressure-bearing disk 1 center at convoluted diaphragm 6 centers and fixes, and the other end of transmission rod 13 connects the shaft collar 12 that the edge has groove.Measure grating 7 and connect with temperature compensation grating 8, the optical fiber 15 between steel wire 10 1 ends and two gratings glueds joint, and the other end is walked around with reeded miniature bearing 11 and is glued in the groove of shaft collar 12.Temperature compensation grating 8 two ends are fixed on the temperature compensation grating holder 14 that is placed in housing 4 sidewalls, optical fiber micro-bending between two.Be provided with rubber seal 3 between annular tight loop 2 and bearing disc 1, optical fiber 15 is drawn from the optical fiber fairlead 16 of housing 4 wall both sides.
Must prestretched steel wire 10 before steel wire 10 is bonding with shaft collar 12, guarantee that steel wire 10 is stretching, avoid occurring that in measuring process, steel wire 10 bendings cause resolution low, affect measurement result.
Be provided with O-ring seal 3 between annular tight loop 2 and bearing disc 1, be used for preventing that solid dielectric from entering between convoluted diaphragm 6 and bearing disc 1, affects sensor performance.O-ring seal 3 is selected soft rubber material, and is minimum with the bounce that guarantees 3 pairs of bearing discs 1 of O-ring seal.
Be between annular tight loop 2 and disk end cap 5 and housing 4 and be threaded.Bearing disc 1, convoluted diaphragm 6, shaft collar 12 are concentric.
When being subject to solid dielectric pressure, bearing disc 1 is experienced and is concentrated this pressure, and process transmission rod 13 acts on the center of convoluted diaphragm 6, make it produce deformation, this deformation pulls steel wire 10 by transmission rod 13, the suffered pulling force of steel wire 10 turns to through miniature bearing 11 and produces the tension and compression effect to measuring grating 7, thereby causes that measuring grating 7 centre wavelengths produces drift.Temperature compensation grating 8 is not affected by pulling force, is used for the compensate for ambient temperature variation.
Concrete manufacturing process of the present utility model is: at first, steel wire 10 is sticked on the optical fiber 15 of measuring between grating 7 and temperature compensation grating 8, optical fiber 15 is passed optical fiber fairlead 16.Fixedly 8, temperature compensation grating is in the correct position of housing 4 inwalls, and steel pole 9 one ends inserted the via hole of housings 4, and miniature bearing 11 passes steel pole 9, overlaps the position with steel wire 10 at its groove and steel pole 9 is fixed, and the via hole use adhesive at steel pole 9 two ends is shut.Then, temperature compensation grating 8 is little curved, stick on temperature compensation grating holder 14.Use annular tight loop 2 fixedly convoluted diaphragm 6 and housing 4, and place O-ring seal 3, transmission rod 13 is passed the middle via hole of convoluted diaphragm 6, be connected with bearing disc 1 by screw thread, transmission rod 13 other ends and steel wire 12 shaft collars are fixed.At last, an end that uses adhesive will measure grating 7 is fixed on optical fiber fairlead 16, keep steel wire 10 to walk around for its other end of tension the groove that miniature bearing 11 passes shaft collar 12 edges, use fast type adhesive filler wires 10 and groove admittedly, build disk end cap 5 after glue solidifies fully.
When detecting at the scene, at first earth pressure gauge is embedded in measured medium, bearing disc 1 impression is by measuring pressure, use the optic fiber grating wavelength (FBG) demodulator to monitor simultaneously with the wave length shift of temperature compensation grating 8 measuring grating 7, through software data processing, the impact of elimination temperature, and the wavelength variations that records is converted into corresponding soil pressure value.
Claims (10)
1. high-sensitivity optical fiber grating earth pressure gauge, comprise shell, pressure-sensitive component, pressure measurement unit and shaft collar, described pressure-sensitive component, pressure measurement unit, shaft collar are located in the protection housing, it is characterized in that: the upper end of described housing is provided with bearing disc, and two groups of via holes are arranged on housing wall; Described pressure-sensitive component comprises convoluted diaphragm, transmission rod, and described convoluted diaphragm is horizontally through transmission rod, and the two ends of convoluted diaphragm and housing be rigidly connected, and transmission rod one end is connected with shaft collar, and the other end is connected with the bearing disc center; Described pressure measurement unit comprises bearing, steel wire, measurement grating and optical fiber, the central shaft of described bearing passes one group of via hole of housing wall, another group via hole on housing wall is passed at the two ends of described optical fiber, measuring grating scribes on optical fiber, measuring grating one end is connected with steel wire, the other end is fixed on the optical fiber fairlead, and described steel wire is walked around bearing and is connected with shaft collar.
2. a kind of high-sensitivity optical fiber grating earth pressure gauge as claimed in claim 1, it is characterized in that: described housing is cylindrical cavity, the lower end of housing is provided with the disk end cap, the two ends of described convoluted diaphragm are rigidly connected by annular tight loop and housing, and described measurement grating one end is connected by colloid with steel wire.
3. a kind of high-sensitivity optical fiber grating earth pressure gauge as claimed in claim 1 is characterized in that: described bearing disc core is outstanding to the inside, and the outshot of bearing disc is provided with coordinate with transmission rod blind threaded.
4. a kind of high-sensitivity optical fiber grating earth pressure gauge as claimed in claim 1, it is characterized in that: described bearing is provided with for the groove of placing steel wire, the central shaft of bearing is fixed on housing, also there is coordinate with transmission rod blind threaded at described shaft collar center, and the shaft collar edge has for the fixing groove of steel wire; Described steel wire is walked around in the groove that miniature bearing is bonded in shaft collar.
5. a kind of high-sensitivity optical fiber grating earth pressure gauge as claimed in claim 1 is characterized in that: described transmission rod two ends diameter is less than the middle part diameter, and two ends all are threaded.
6. a kind of high-sensitivity optical fiber grating earth pressure gauge as claimed in claim 1 is characterized in that: the described convoluted diaphragm center of circle is provided with via hole, via hole internal diameter and transmission rod thread end external diameter coupling, and less than transmission rod middle part diameter.
7. a kind of high-sensitivity optical fiber grating earth pressure gauge as claimed in claim 1 is characterized in that: described bearing disc, convoluted diaphragm, shaft collar three are concentric.
8. a kind of high-sensitivity optical fiber grating earth pressure gauge as claimed in claim 1, it is characterized in that: the center line of described two groups of via holes is mutually vertical, and the center line of two groups of via holes is with respect to housing center line eccentric setting, and described bearing is miniature bearing.
9. a kind of high-sensitivity optical fiber grating earth pressure gauge as claimed in claim 1, it is characterized in that: also comprise annular tight loop, described annular tight loop is connected with outer casing screw, is provided with rubber seal between described annular tight loop and bearing disc.
10. a kind of high-sensitivity optical fiber grating earth pressure gauge as claimed in claim 1, it is characterized in that: also comprise the temperature compensation grating, temperature compensation grating and side amount grating are two gratings scribing on same optical fiber, two gratings are in series, described temperature compensation grating two ends are connected to be fixed on housing sidewall, the temperature compensation grating is bending, and with the both sides of measuring grating and be distributed in central shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220633684 CN202974524U (en) | 2012-11-26 | 2012-11-26 | High sensitivity fiber bragg grating soil pressure gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220633684 CN202974524U (en) | 2012-11-26 | 2012-11-26 | High sensitivity fiber bragg grating soil pressure gauge |
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| Publication Number | Publication Date |
|---|---|
| CN202974524U true CN202974524U (en) | 2013-06-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220633684 Withdrawn - After Issue CN202974524U (en) | 2012-11-26 | 2012-11-26 | High sensitivity fiber bragg grating soil pressure gauge |
Country Status (1)
| Country | Link |
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| CN (1) | CN202974524U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017950A (en) * | 2012-11-26 | 2013-04-03 | 山东大学 | High-sensitivity fiber bragg grating earth pressure gauge |
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2012
- 2012-11-26 CN CN 201220633684 patent/CN202974524U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017950A (en) * | 2012-11-26 | 2013-04-03 | 山东大学 | High-sensitivity fiber bragg grating earth pressure gauge |
| CN103017950B (en) * | 2012-11-26 | 2015-02-11 | 山东大学 | High-sensitivity fiber bragg grating earth pressure gauge |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130605 Effective date of abandoning: 20150211 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20130605 Effective date of abandoning: 20150211 |
|
| RGAV | Abandon patent right to avoid regrant |