CN201094033Y - Surface mounting or soldering type stress-strain test sensing equipment - Google Patents
Surface mounting or soldering type stress-strain test sensing equipment Download PDFInfo
- Publication number
- CN201094033Y CN201094033Y CNU2007200306807U CN200720030680U CN201094033Y CN 201094033 Y CN201094033 Y CN 201094033Y CN U2007200306807 U CNU2007200306807 U CN U2007200306807U CN 200720030680 U CN200720030680 U CN 200720030680U CN 201094033 Y CN201094033 Y CN 201094033Y
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- grating sensor
- fiber
- surface mounting
- tension rod
- pull bar
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Abstract
The utility model relates to a surface mounting or welded type stress-strain testing sensor, comprising fixing plates and a tension rod, wherein, one end of the tension rod is fixedly connected with a first fixing plate, the other end of the tension rod is movably connected with a second fixing plate by a connecting piece, a groove is carved on the tension rod, the inner part of the groove is laid with a fiber grating sensor, the outside of the tension rod section of the fiber grating sensor is encapsulated with thermal insulation material, an optical fiber is led from the fiber grating sensor and is connected with an optical signal demodulating and processing device. When the utility model is in use, the fixing plates are respectively fixed on different points of a measuring surface by passing through bolts inside strip holes, the different points refer to the space between a bridge deck and a bridge pier or the space between the seams of the wall surfaces of buildings; when displacement exists among measuring points, the generated stress can be transmitted to the fiber grating sensor by the tension rod, the signal is transmitted inside the signal demodulating and processing device by the fiber grating sensor, the stress or the strain among the measuring points can be analyzed by the signal processing device. The surface mounting or welded type stress-strain testing sensor has the advantages of simple structure, convenient use, accurate measurement, intuition, etc.
Description
Technical field
The utility model relates to a kind of device for measuring force, installation or welding type stress-strain test sensing units such as specifically a kind of measurement bridge, buildings.
Background technology
Strain stress survey sensor between 2 of the present structure or the face of measurement is varied, but most sensor is a point measurement, and inconvenient networking is poor to the antijamming capability of site environment simultaneously, needs often zeroing and correction.
Summary of the invention
The utility model is for overcoming above-mentioned the deficiencies in the prior art, provide a kind of simple in structure, easy to use, be convenient to networking, measure the fiber Bragg grating type ess-strain sensing device between the measurement point accurately, can realize mounted on surface or welding, can carry out the measurement adjustment of sensor after the installation, the tension and compression that change sensor change.
The purpose of this utility model is to adopt following technical proposals to realize: a kind of Surface mounting or soldering type stress-strain test sensing equipment, comprise fixed head and pull bar, one end of pull bar is fixedlyed connected with first fixed head, the other end of pull bar is connected with second fixed head by web member, pull bar is provided with fiber-optic grating sensor, and fiber-optic grating sensor is connected with light signal demodulation process device by optical fiber.
Described pull bar is provided with groove, is laid with fiber-optic grating sensor in the groove, and the fiber-optic grating sensor outside is packaged with thermal insulation material, as heat-insulated solidified materials such as silicon sulfide protecting colloids, can prevent the influence that grating strain transducer is heated.
Described fixed head becomes the L type, and the horizontal component of fixed head is provided with strip hole.
Described web member comprises sleeve pipe and external thread post, and internal thread is arranged in the sleeve pipe, and external thread post one end is fixed on second fixed head, the other end cooperates with sleeve pipe one end, pull bar passes the sleeve pipe other end, by rotating casing, and the distance of two measurement points of adjustable sensor.
The light signal processing device of mentioning in the utility model is existing equipment, does not repeat them here.
When the utility model uses, fixed head is separately fixed between the bridge floor and bridge pier of bridge by the bolt that passes in the strip hole, perhaps between the building wall joints, when being subjected to displacement between bridge floor and the bridge pier, or when being subjected to displacement between the building metope, the stress that produces can be delivered on the fiber-optic grating sensor by pull bar, and fiber-optic grating sensor is delivered to signal in the signal processing apparatus by optical fiber again, by signal processing apparatus signal is carried out analyzing and processing and reaches a conclusion.The utlity model has advantages such as simple in structure, easy to use, that measurement is accurate, directly perceived.
Description of drawings
Fig. 1 is the utility model structural representation;
Fig. 2 is a fiber-optic grating sensor sensing index path of the present utility model;
Fig. 3 is the just loading and the negative correlation curve figure that loads of fiber-optic grating sensor of the present utility model;
1. first fixed heads wherein, 2. pull bar, 3. fiber-optic grating sensor, 4. sleeve pipe, 5. second fixed head, 6. strip hole, 7. double-screw bolt, the 8. adiabatic colloid that solidifies, 9. optical fiber, 10. incident light, 11. reflected light, 12. transmitted lights.
Embodiment
Below in conjunction with drawings and Examples the utility model is further specified.
Embodiment 1: among Fig. 1, the left end of pull bar 2 is fixedlyed connected with first fixed head 1, the right-hand member of pull bar 2 is connected with double-screw bolt 7 by sleeve pipe 4, double-screw bolt 7 is connected with second fixed head 5, be carved with groove on the pull bar 2, be laid with fiber-optic grating sensor 3 in the groove, fiber-optic grating sensor 3 outsides are provided with the adiabatic colloid 8 that solidifies, can reduce the heat conduction of fiber-optic grating sensor 3, improve test accuracy.Fiber-optic grating sensor 3 is connected with light signal processing device by optical fiber 9.Fixed head becomes the L type, and the horizontal component of fixed head is provided with strip hole 6.
During use, fixed head is separately fixed between the bridge floor and bridge pier of bridge by the bolt that passes in the strip hole 6, perhaps between the building wall joints, when being subjected to displacement between bridge floor and the bridge pier, or when being subjected to displacement between the building metope, the stress that produces can be delivered on the fiber-optic grating sensor 3 by pull bar 2, and fiber-optic grating sensor 3 is delivered to signal in the signal processing apparatus by optical fiber 9 again, by signal processing apparatus signal is carried out analyzing and processing and reaches a conclusion.
Fiber grating of the present utility model adopts Bragg grating, is a kind of narrowband reflection filtering passive device of excellent performance.When the broadband light wave transmits in Bragg grating, incident light wave will be reflected on correspondent frequency, and as Fig. 2, wherein 10 represent incident lights, 11 expression reflected light, 12 expression transmitted lights.According to optical fiber coupled mode theory, when broadband light is transmitted, can produce Mode Coupling in Bragg grating, satisfy conditioned reflex λ
B=2n
EffThe light of Λ is reflected, wherein n
EffBe effective refractive index, Λ is the grating cycle, λ
BBe the reflection kernel wavelength.
Cause in the extraneous factor of Bragg grating wavelength-shift at all, the most direct is the ess-strain parameter, no matter grating is stretched or extruding, the Λ that will cause the grating cycle changes, and the elasto-optical effect that optical fiber itself is had makes effective refractive index also change with the variation of extraneous stress state, therefore, this stress-strain test sensor that adopts Bragg grating to make, the wavelength-shift of grating can be expressed as
Δλ
B＝2Δn
effΛ+2n
effΔΛ (2)
(2) in the formula, Δ Λ is this elastic deformation under stress of optical fiber, Δ n
EffIt is the elasto-optical effect of optical fiber.
To be this Fiber Bragg Grating FBG stress-strain test sensor stretching (just loading) Fig. 3, compression (the negative loading), and continuously in the change procedure, the variation of grating centre wavelength finds out that thus this sensor can measure extraneous the stretching and compression stress well.
Embodiment 2: as different from Example 1, the right-hand member of pull bar 2 flexibly connects by the screw thread and second fixed head 5.
Claims (4)
1. Surface mounting or soldering type stress-strain test sensing equipment, comprise fixed head and pull bar, it is characterized in that: an end of pull bar is fixedlyed connected with first fixed head, the other end of pull bar is connected with second fixed head by web member, pull bar is provided with fiber-optic grating sensor, and fiber-optic grating sensor is connected with light signal demodulation process device by optical fiber.
2. Surface mounting or soldering type stress-strain test sensing equipment according to claim 1 is characterized in that: described pull bar is provided with groove, is laid with fiber-optic grating sensor in the groove, and the fiber-optic grating sensor outside is packaged with thermal insulation material.
3. Surface mounting or soldering type stress-strain test sensing equipment according to claim 1 is characterized in that: described fixed head becomes the L type, and the horizontal component of fixed head is provided with strip hole.
4. Surface mounting or soldering type stress-strain test sensing equipment according to claim 1, it is characterized in that: described web member comprises sleeve pipe and external thread post, internal thread is arranged in the sleeve pipe, external thread post one end is fixed on second fixed head, the other end cooperates with sleeve pipe one end, and pull bar passes the sleeve pipe other end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200306807U CN201094033Y (en) | 2007-11-14 | 2007-11-14 | Surface mounting or soldering type stress-strain test sensing equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200306807U CN201094033Y (en) | 2007-11-14 | 2007-11-14 | Surface mounting or soldering type stress-strain test sensing equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201094033Y true CN201094033Y (en) | 2008-07-30 |
Family
ID=39902002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200306807U Expired - Fee Related CN201094033Y (en) | 2007-11-14 | 2007-11-14 | Surface mounting or soldering type stress-strain test sensing equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201094033Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539036A (en) * | 2010-12-31 | 2012-07-04 | 广西大学 | Welded type underwater stress measuring device |
| CN105043282A (en) * | 2015-05-21 | 2015-11-11 | 大连理工大学 | Fiber grating shear strain sensor |
| CN108120739A (en) * | 2018-01-24 | 2018-06-05 | 西安理工大学 | A kind of thermal deformation measurement device for high-precision machine tool hydrostatic bearing |
-
2007
- 2007-11-14 CN CNU2007200306807U patent/CN201094033Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539036A (en) * | 2010-12-31 | 2012-07-04 | 广西大学 | Welded type underwater stress measuring device |
| CN105043282A (en) * | 2015-05-21 | 2015-11-11 | 大连理工大学 | Fiber grating shear strain sensor |
| CN108120739A (en) * | 2018-01-24 | 2018-06-05 | 西安理工大学 | A kind of thermal deformation measurement device for high-precision machine tool hydrostatic bearing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |