AU2019101695A4 - An Optical Fiber Grating Arch Bridge Pressure Sensor - Google Patents
An Optical Fiber Grating Arch Bridge Pressure Sensor Download PDFInfo
- Publication number
- AU2019101695A4 AU2019101695A4 AU2019101695A AU2019101695A AU2019101695A4 AU 2019101695 A4 AU2019101695 A4 AU 2019101695A4 AU 2019101695 A AU2019101695 A AU 2019101695A AU 2019101695 A AU2019101695 A AU 2019101695A AU 2019101695 A4 AU2019101695 A4 AU 2019101695A4
- Authority
- AU
- Australia
- Prior art keywords
- arch bridge
- fiber grating
- optical fiber
- pressure sensor
- elastic device
- 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.)
- Ceased
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 23
- 239000002184 metal Substances 0.000 claims abstract description 32
- 239000000835 fiber Substances 0.000 claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 238000012360 testing method Methods 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 230000003287 optical effect Effects 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
- G01L1/243—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 means for applying force perpendicular to the fibre axis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/165—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by means of a grating deformed by the object
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optical Transform (AREA)
Abstract
Abstract The invention discloses a fiber grating arch bridge pressure sensor, which comprises a combined metal box, an arch bridge elastic device, a metal wire, and an optical fiber grating. Both ends of the metal wire are connected with the middle part of the arch bridge elastic device, and the optical fiber grating is attached to the metal wire. The combined metal box comprises an upper and a lower part, both parts can move relative to each other up and down. When there is pressure on the upper part of the combined metal box, the pressure all acts on the upper part of the arch bridge elastic device, one end of the arch bridge elastic device is fixed at the bottom of the metal box, and the other end is a movable end. And the high-precision test of the vertical stress is realized through the optical fiber grating sensing technology to form a pressure sensor based on the optical fiber sensing.
Description
2019101695 24 Dec 2019
Description
An optical fiber grating arch bridge pressure sensor
Technical Field
The invention relates to the technical field of sensors, in particular a fiber grating arch bridge pressure sensor.
Background Technology
Sensor technology is a key technology of modern science and technology. The electrical sensors are commonly used for stress measurement, which are prone to problems such as low accuracy, and failure due to external interference (especially the influence of water) and so on.
Fiber grating is a new type of reflection filter passive sensor with wide application prospect and excellent performance 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 conditions of the grating is reflected back as reflected light, the rest of the light being as the transmitted light. Changes of external parameters will cause the wavelengths of the reflected light to drift. The change amount of the parameters can be obtained by detecting the amount of wavelength drifts. Temperature and strain are the two external parameters contributing to direct changes of the reflected light wavelengths. The structure of a fiber grating is shown in Figure 1, where 01 is the fiber core, 02 is the cladding wrapped outside the fiber core, and A is the grating period; Figure 2 is an energy distribution diagram when the light passes through the grating, where 2-1 is the incident light spectrum, 2-2 is the reflected spectrum, 2-3 is the transmission (conduction) spectrum, the abscissa represents the wavelengths, the ordinate represents the energy, and 2h is the center wavelengths of the reflected light.
i
2019101695 24 Dec 2019
The fiber Bragg gratings have extremely high test accuracy and are 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, this technology has been widely used in many fields, such as aerospace, composite materials, concrete structure engineering, power engineering and medicine.
Invention Summary
The technical problem to be solved by the present invention is to provide a fiber grating arch bridge pressure sensor in view of the shortcomings of the prior art.
The present invention adopts the following technical solutions:
A fiber grating arch bridge pressure sensor comprises a combined metal box, an arch bridge elastic device, a metal wire, and an optical fiber grating. Both ends of the metal wire are connected with the middle part of the arch bridge elastic device, and the optical fiber grating is attached to the metal wire. The combined metal box comprises an upper and a lower part, the two parts can move relative to each other up and down. When there is pressure on the upper part of the combined metal box, the pressure all acts on the upper part of the arch bridge elastic device, one end of the arch bridge elastic device is fixed at the bottom of the metal box, and the other end is a movable end.
The optical fiber grating arch bridge pressure sensor as described above, the arch bridge elastic device is a steel sheet.
The optical fiber grating arch bridge pressure sensor as described above, the metal wire is a steel wire.
The optical fiber grating arch bridge pressure sensor as described above, the combined metal box is a rectangular parallelepiped.
The optical fiber grating arch bridge pressure sensor as described above, the movable end is in contact with the lower part of the combined metal box, and a groove is provided at
2019101695 24 Dec 2019 the contact portion, so that the movable end has sufficient space.
The high-precision test of the vertical stress is realized through the optical fiber grating sensing technology to form a pressure sensor based on the optical fiber sensing.
Brief Description of the Drawings
Figure 1 is a schematic diagram of a fiber grating structure;
Figure 2 is an energy distribution diagram when light passes through a grating;
Figure 3 is a schematic diagram of the sensor structure of the present invention
Figure 4 is a partially enlarged view of Figure 3;
Figure 5 is a schematic diagram of the circuit principle of a 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 according to the invention is shown is shown in Figure 3 and Figured. It comprises a cuboid combined metal box 20 (it is divided into the upper and the lower parts, and the two parts are movably connected), a high-strength steel sheet 10, a steel wire 50, and an optical fiber grating 30. The high-strength steel sheet 10 is folded into an arch bridge, and the steel wire 50 is pulled in the middle of the arch bridge while the optical fiber grating 30 is attached to the steel wire 50. One end of the arch bridge 101 is fixed at the bottom of the metal box, and the other end is a movable end 102. The movable end 102 is in contact to the bottom of the metal box 20, and a small slope groove 40 is provided at the contact point to make it have sufficient space for movement. When there is pressure in the upper part of the metal box 20, the upper part of the metal does not play a
2019101695 24 Dec 2019 supporting role, so that the pressure is all acting on the upper part of the arch bridge formed by the high strength steel sheet 10.
2. The working principle of the sensor
The arch bridge tends to move outward at both ends due to the pressure from the upper part, which causes the steel wire in the middle to have a relatively obvious tensile stress, which in turn causes the tensile strain of the fiber grating attached to it, and the wavelength shifts of reflected light occurs. Through the test and data processing of the reflected wavelengths, the magnitude of the upper stress can be 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, and the reflected light returns to the demodulator 40. After the photoelectric conversion 21 generates an electrical signal, the data acquisition 22 generates a digital signal 32. The digital signal 32 passes through the wavelength calculation 23 and data analysis 24, the change information of the reflected wavelengths can be obtained through this process, and then the change of the rotation angle can be obtained through data processing. The specific test process is shown in Figure 5.
It should be understood that, for ordinary technicians in the field, improvements or changes can be made in accordance with the above instructions, all of which should fall into the protection scope of the appended claims of the present invention.
Claims (5)
1. The invention discloses a fiber grating arch bridge pressure sensor, which characterizes that it comprises a combined metal box, an arch bridge elastic device, a metal wire, and an optical fiber grating. Both ends of the metal wire are connected with the middle part of the arch bridge elastic device, and the optical fiber grating is attached to the metal wire. The combined metal box comprises an upper and a lower part, the two parts can move relative to each other up and down. When there is pressure on the upper part of the combined metal box, the pressure all acts on the upper part of the arch bridge elastic device, one end of the arch bridge elastic device is fixed at the bottom of the metal box, and the other end is a movable end.
2. The optical fiber grating arch bridge pressure sensor according to claims 1, which characterizes that the arch bridge elastic device is a steel sheet.
3. The optical fiber grating arch bridge pressure sensor according to claims 1, which characterizes that the metal wire is a steel wire.
4. The optical fiber grating arch bridge pressure sensor according to claims 1, which characterizes that the combined metal box is a rectangular parallelepiped.
5. The optical fiber grating arch bridge pressure sensor according to claims 1, which characterizes that the movable end is in contact with the lower part of the combined metal box, and there is a groove at the contact place, so that the movable end has sufficient active space.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2019101695A AU2019101695A4 (en) | 2019-12-24 | 2019-12-24 | An Optical Fiber Grating Arch Bridge Pressure Sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2019101695A AU2019101695A4 (en) | 2019-12-24 | 2019-12-24 | An Optical Fiber Grating Arch Bridge Pressure Sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2019101695A4 true AU2019101695A4 (en) | 2020-02-06 |
Family
ID=69284253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2019101695A Ceased AU2019101695A4 (en) | 2019-12-24 | 2019-12-24 | An Optical Fiber Grating Arch Bridge Pressure Sensor |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU2019101695A4 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112629430A (en) * | 2020-12-07 | 2021-04-09 | 贵州乌江清水河水电开发有限公司 | Novel optical fiber type joint meter |
-
2019
- 2019-12-24 AU AU2019101695A patent/AU2019101695A4/en not_active Ceased
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112629430A (en) * | 2020-12-07 | 2021-04-09 | 贵州乌江清水河水电开发有限公司 | Novel optical fiber type joint meter |
| CN112629430B (en) * | 2020-12-07 | 2023-03-31 | 贵州乌江清水河水电开发有限公司 | Novel optical fiber type joint meter |
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Legal Events
| 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 |