AU2020100062A4 - A Fiber Grating Pressure Sensor For Vertical Stress Test In Similar Simulation Experiments - Google Patents
A Fiber Grating Pressure Sensor For Vertical Stress Test In Similar Simulation Experiments Download PDFInfo
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- AU2020100062A4 AU2020100062A4 AU2020100062A AU2020100062A AU2020100062A4 AU 2020100062 A4 AU2020100062 A4 AU 2020100062A4 AU 2020100062 A AU2020100062 A AU 2020100062A AU 2020100062 A AU2020100062 A AU 2020100062A AU 2020100062 A4 AU2020100062 A4 AU 2020100062A4
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- AU
- Australia
- Prior art keywords
- fiber grating
- metal box
- vertical stress
- face
- cylindrical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000000835 fiber Substances 0.000 title claims abstract description 23
- 238000012360 testing method Methods 0.000 title claims abstract description 19
- 238000004088 simulation Methods 0.000 title claims abstract description 12
- 239000002184 metal Substances 0.000 claims abstract description 23
- 210000003518 stress fiber Anatomy 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 description 9
- 238000011160 research Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000005065 mining Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000011435 rock Substances 0.000 description 5
- 239000003245 coal Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000009662 stress testing Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
- G01L1/246—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre using integrated gratings, e.g. Bragg gratings
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02061—Grating external to the fibre and in contact with the fibre, e.g. evanescently coupled, gratings applied to the fibre end
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/0208—Refractive index modulation gratings, e.g. Bragg gratings characterised by their structure, wavelength response
- G02B6/02085—Refractive index modulation gratings, e.g. Bragg gratings characterised by their structure, wavelength response characterised by the grating profile, e.g. chirped, apodised, tilted, helical
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/122—Basic optical elements, e.g. light-guiding paths
- G02B6/124—Geodesic lenses or integrated gratings
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B2006/12083—Constructional arrangements
- G02B2006/12107—Grating
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
Abstract The invention discloses a vertical stress fiber grating pressure sensor for similar simulation experiments, which comprises a cylindrical metal box, a cylindrical rubber block and a fiber grating. The side of the cylindrical rubber block is pasted with a fiber grating along the circumferential direction, which is used for testing the circumferential strain of the rubber. The lower end face of the cylindrical rubber block is fixed at the bottom of the cylindrical metal box, and the upper end face connected to the upper end face of the metal box; the cylindrical metal box comprises an upper and a lower part, and the two parts are sleeved together. The two parts can move up and down relative to each other. When a vertical stress acts on the upper end face of the metal box, the vertical stress all acts on the rubber block. The invention will provide a new testing method for similar simulation experiments, and the fiber grating has extremely high precision, and can provide accurate data. Figure3 Figure4
Description
2020100062 13 Jan 2020
Description
A fiber grating pressure sensor for vertical stress test in similar simulation experiments Technical Field
The invention relates to a fiber grating pressure sensor for vertical stress test in similar simulation experiments.
Background Technology
Similar material simulation experiments are one of the traditional research methods of rock mechanics, presently adopted by many engineering research institutes. In the 1940s, Kuznetsov, a researcher of the Quansu Mining Research Institute Γ.Η., established plane similar material model experiment technology and applied it to the study of damage behavior of rock strata in coal mining. In the 1960s, this method was introduced into Chinese universities and scientific research units and became the main research method for mining and geotechnical engineering problems. It has been applied in many aspects, such as rock burst in coal mine, underground mining, top coal mining in thick coal seams, shaft sinking and drifting, and mine safety technology.
However, since the simulation experiments of similar materials have developed so far, the stress and strain in the model cannot be tested, and the relative lag between experimental equipment and experimental technology exists so commonly. A variety of sensors are currently used to paste through an electrical strain gauge. However, due to the fact that the gauge is susceptible to external interference, Therefore, sensor failure often seriously affects the accuracy of experimental tests.
i
2020100062 13 Jan 2020 (1) Low accuracy;
(2) It is susceptible to external interference, in particular influence of water;
Fiber Bragg grating (FBG) is a new type of reflection-filtering passive sensitive element with wide application prospect and excellent performance in the world since 1990s. The on-line measurement of the structure is realized by sensing the small strain changes outside by testing movements of reflected wavelengths of the fiber Bragg grating. The basic principle is that when the light wave in the optical fiber passes through the grating, the light satisfying the wavelength condition of the grating is reflected back as reflected light, the rest of the light being transmitted light. Changes of external parameters will cause the drift of the reflected light wavelengths, and the change amount of the parameter can be obtained by detecting the wavelength drifts. Temperature and strain are the two parameters that contribute to direct changes of the reflected light wavelengths. The structure of the fiber grating is shown in Figure 1, where 01 is the fiber core and 02 is the coating wrapped outside the fiber core, A is the grating period. Figure 2 is the energy distribution diagram when light passes through the grating, where 2-1 is the incident spectrum, 2-2 is the reflection spectrum, 2-3 is the transmission (conduction) spectrum, the abscissa represents the wavelengths, and the ordinate represents the energy, Ah is the center wavelengths of the reflected light.
The Fiber Bragg grating has extremely high test accuracy and is immune to external interference such as electromagnetic radiation. In addition, they have many advantages such as easy deployment and quasi-distributed measurement. In view of this, the technology has been widely used in aerospace, composite materials, concrete structure engineering, power engineering and medicine.
2020100062 13 Jan 2020
Invention Summary
The technical problem to be solved by the present invention is to provide a fiber grating pressure sensor for vertical stress test in simulation experiments, in view of the shortcomings of the prior art.
The present invention adopts the following technical solutions:
A vertical stress fiber grating pressure sensor for similar simulation experiments comprises a cylindrical metal box, a cylindrical rubber block and a fiber grating. The side of the cylindrical rubber block is pasted with a fiber grating along the circumferential direction, which is used for testing the circumferential strain of the rubber. The lower end face of the cylindrical rubber block is fixed at the bottom of the cylindrical metal box, and the upper end face connected to the upper end face the metal box; the cylindrical metal box comprises an upper part and a lower part, and the upper part and the lower parts are sleeved together. The two parts can move up and down relative to each other. When a vertical stress acts on the upper end face of the metal box, the vertical stress all acts on the rubber block.
Rock pressure similarity simulation experiment is one of the most commonly used research methods in rock mechanics, but the backwardness of testing methods has hindered its development severely, especially the internal stress testing. Therefore, the present invention will provide a new testing method for similar simulation experiments, and the fiber grating has extremely high accuracy and can provide accurate data.
Brief Description of the Drawings
Figure 1 is a schematic diagram of the fiber grating structure;
2020100062 13 Jan 2020
Figure 2 is an energy distribution diagram when light passes through the grating;
Figure 3 is a schematic diagram of the sensor structure of the present invention
Figure 4 is a schematic diagram of the circuit principle of the test process of the present invention.
Detailed Description of the Presently Preferred Embodiments
The present invention is described in detail below with reference to specific embodiments.
1. Sensor structure
The specific structure of the sensor of the present invention is shown in Figure 2. It comprises a cylindrical metal boxlO, a cylindrical rubber block 20 and a fiber grating30. The side of the cylindrical rubber block 20 is pasted with a fiber grating 30 along the circumferential direction, which is used for testing the circumferential strain of the rubber. The lower end face of the cylindrical rubber block 20 is fixed at the bottom of the cylindrical metal box 10, and its upper end face is connected to the upper end face of the metal box; the cylindrical metal box 10 comprises an upper part and a lower part, the upper and the lower parts are sleeved together. The two parts can move up and down relative to each other, and can protect the fiber grating 30. When a vertical stress is applied to the upper end face of the metal box 10, the side of the metal box cannot support, and the vertical stress is all applied to the rubber block 20. At the same time, the metal box also avoids the impact of the lateral stress on the test process.
2. The working principle of the sensor
The sensor of the present invention is buried in a similar model. The vertical stress acts on the upper end face of the metal box 10. The rubber block 20 is compressed and deformed after compression, and the circumferential strain causes the tensile strain of fiber grating and the
2020100062 13 Jan 2020 drift of reflected light wavelengths. Through testing and conversion of the reflection wavelengths, the vertical stress is obtained.
3. Test process
The fiber grating 30 is connected to the demodulator 40 through an external lead, and the demodulator 40 is connected to an external computer 42 through a network connection 41. After the demodulator 40 sends an optical signal to the fiber grating 30, the light meeting the reflection condition is reflected back to the demodulator 40 and the electrical signal is generated by the photoelectric conversion 21, and the digital signal 32 is generated by the data acquisition 22. The digital signal 32 is subjected to wavelength calculation 23 and data analysis 24. Through this process, the change information of reflection wavelengths can be obtained, and then vertical stress can be obtained through data processing. The specific test process is shown in Figure 4.
It should be understood that, for ordinary technicians in the field, improvements or transformations may be made in accordance with the above-mentioned instructions, all of which shall fall within the protection scope of the appended claims of the present invention.
Claims (1)
1. The invention discloses a vertical stress fiber grating pressure sensor for similar simulation experiments, which characterizes that it comprises a cylindrical metal box, a cylindrical rubber block and a fiber grating. The side of the cylindrical rubber block is pasted with a fiber grating along the circumferential direction, which is used for testing the circumferential strain of the rubber. The lower end face of the cylindrical rubber block is fixed at the bottom of the cylindrical metal box, and the upper end face connected to the upper end face of the metal box; the cylindrical metal box comprises an upper part and a lower part, and the upper part and the lower parts are sleeved together. The two parts can move up and down relative to each other. When a vertical stress acts on the upper end face of the metal box, the vertical stress all acts on the rubber block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2020100062A AU2020100062A4 (en) | 2020-01-13 | 2020-01-13 | A Fiber Grating Pressure Sensor For Vertical Stress Test In Similar Simulation Experiments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2020100062A AU2020100062A4 (en) | 2020-01-13 | 2020-01-13 | A Fiber Grating Pressure Sensor For Vertical Stress Test In Similar Simulation Experiments |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2020100062A4 true AU2020100062A4 (en) | 2020-02-13 |
Family
ID=69412718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2020100062A Ceased AU2020100062A4 (en) | 2020-01-13 | 2020-01-13 | A Fiber Grating Pressure Sensor For Vertical Stress Test In Similar Simulation Experiments |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU2020100062A4 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112730730A (en) * | 2020-12-23 | 2021-04-30 | 长安大学 | Model test device and test method for burning coal bed under highway |
-
2020
- 2020-01-13 AU AU2020100062A patent/AU2020100062A4/en not_active Ceased
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112730730A (en) * | 2020-12-23 | 2021-04-30 | 长安大学 | Model test device and test method for burning coal bed under highway |
| CN112730730B (en) * | 2020-12-23 | 2023-02-03 | 长安大学 | Model test device and test method for highway underlying burning coal bed |
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| Date | Code | Title | Description |
|---|---|---|---|
| FGI | Letters patent sealed or granted (innovation patent) | ||
| MK22 | Patent ceased section 143a(d), or expired - non payment of renewal fee or expiry |