CN214666781U - Double-fiber grating static level - Google Patents
Double-fiber grating static level Download PDFInfo
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- CN214666781U CN214666781U CN202120468468.9U CN202120468468U CN214666781U CN 214666781 U CN214666781 U CN 214666781U CN 202120468468 U CN202120468468 U CN 202120468468U CN 214666781 U CN214666781 U CN 214666781U
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- cylindrical
- fiber grating
- equal
- cantilever beam
- liquid
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- 239000000835 fiber Substances 0.000 title claims abstract description 61
- 230000003068 static effect Effects 0.000 title claims abstract description 27
- 239000007788 liquid Substances 0.000 claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 230000009977 dual effect Effects 0.000 claims description 4
- 230000008020 evaporation Effects 0.000 abstract description 11
- 238000001704 evaporation Methods 0.000 abstract description 11
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 238000006073 displacement reaction Methods 0.000 abstract description 2
- 230000007774 longterm Effects 0.000 abstract description 2
- 230000002706 hydrostatic effect Effects 0.000 description 20
- 238000005259 measurement Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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Abstract
本实用新型公开一种双光纤光栅的静力水准器，包括圆筒容器、连杆、圆柱形浮漂、等强度悬臂梁和底部支座；圆柱形浮漂通过连杆固定在等强度悬臂梁顶点的下部；光纤光栅粘贴在等强度悬臂梁下表面；圆柱形浮漂、连杆、等强度悬臂梁均放置在圆筒容器内部；等强度悬臂梁垂直粘贴在圆筒容器内壁，并与光纤光栅、连杆和圆柱形浮漂形成一个整体；圆筒容器放在底部支座上固定不动；两个完全相同的静力水准器放置在同一高度，底部通过水管连接，形成连通器，液面高程始终保持相同。本实用新型建立双光纤光栅波长差与结构位移差的定量关系公式，避免了温度应力、液体蒸发对光纤光栅波长漂移的影响，实现光纤光栅传感器的长期监测。
The utility model discloses a static level with double fiber gratings, which comprises a cylindrical container, a connecting rod, a cylindrical float, an equal-strength cantilever beam and a bottom support; Bottom; fiber grating is pasted on the lower surface of the equal-strength cantilever beam; cylindrical floats, connecting rods, and equal-strength cantilever beams are placed inside the cylindrical container; The rod and the cylindrical float form a whole; the cylindrical container is fixed on the bottom support; two identical static levels are placed at the same height, and the bottom is connected by a water pipe to form a communication device, and the liquid level elevation is always maintained same. The utility model establishes a quantitative relationship formula between the wavelength difference of the double fiber grating and the structural displacement difference, avoids the influence of temperature stress and liquid evaporation on the wavelength drift of the fiber grating, and realizes the long-term monitoring of the fiber grating sensor.
Description
Technical Field
The utility model belongs to the technical field of fiber grating sensing monitoring, concretely relates to hydrostatic level of two fiber grating.
Background
In the prior art, uneven settlement is a main factor causing structural cracking, and a static water level is a main means for monitoring uneven settlement of a structure.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem that exists, the utility model provides a hydrostatic level device of two fiber grating establishes the poor quantitative relation formula with the structural displacement of two fiber grating wavelength, has avoided temperature stress, liquid evaporation to the influence of fiber grating wavelength drift, realizes fiber grating sensor's long-term monitoring. The utility model adopts the technical scheme as follows:
a static level with double fiber gratings comprises a cylindrical container, a connecting rod, a cylindrical float, an equal-strength cantilever beam and a bottom support;
the cylindrical buoy is fixed at the lower part of the top point of the equal-strength cantilever beam through a connecting rod;
the fiber bragg grating is adhered to the lower surface of the equal-strength cantilever beam;
the cylindrical buoy, the connecting rod and the equal-strength cantilever beam are all arranged in the cylindrical container;
the equal-strength cantilever beam is vertically stuck to the inner wall of the cylindrical container and forms a whole with the fiber bragg grating, the connecting rod and the cylindrical buoy;
the cylindrical container is fixedly placed on the bottom support;
Two completely the same hydrostatic levels are placed at the same height, and the bottoms are connected through a water pipe 7 to form a communicating vessel, and the liquid level height is always kept the same.
The preferable scheme of the hydrostatic level with the double fiber gratings is that after liquid is injected into the cylindrical container, the buoyancy of the liquid on the cylindrical buoy changes along with the change of the height of the liquid level, so that the constant-strength cantilever beam deforms, and the strain of the fiber gratings also changes.
The preferable scheme of the hydrostatic level with the double fiber gratings is that the cylindrical container, the connecting rod, the cylindrical buoy, the equal-strength cantilever beam and the bottom support are mechanically connected and can be disassembled at any time and then assembled after being disassembled.
The optimized scheme of the double-fiber grating static level is that when two static levels are not at the same height, due to the communicating vessel, liquid in one static level flows to one static level of the beam, the cylindrical floats respectively descend and ascend, and simultaneously drive the constant-strength cantilever beam to deform, and the strain of the fiber grating also changes.
After analysis, the difference value of the two fiber bragg grating strains is in a linear relation with the height difference of the two cylindrical containers, so that the difference value of the two fiber bragg grating strains can be used for representing the height difference of the two cylindrical containers.
The most important factors that may cause errors in the fiber grating measurements are temperature changes and liquid evaporation that causes the liquid level to drop. However, the difference value of the strain of the two fiber gratings is used for representing the height difference of the two cylindrical containers, and the liquid level reduction caused by the temperature change and the liquid evaporation can enable the data measured by the two fiber gratings to be increased and reduced at the same time, so that the device can automatically eliminate the error caused by the liquid level reduction caused by the temperature change and the liquid evaporation.
The static level of the double fiber bragg gratings is installed by the following steps: the cylindrical buoy is fixed on the lower portion of the top point of the equal-strength beam through the connecting rod, the fiber bragg grating is adhered to the lower surface of the equal-strength cantilever beam, the cylindrical buoy, the connecting rod and the equal-strength cantilever beam are all placed in the cylindrical container, and the cylindrical container is placed on the bottom support and is fixed. The cantilever beam with equal strength is vertically stuck on the inner wall of the cylinder container. Two identical hydrostatic levels place at same height, the bottom is through water piping connection, form the linker, inject into liquid, cylindrical cursory equal strength cantilever beam produces pressure, two hydrostatic levels are not when same height, because the linker, hydrostatic level of liquid flow direction roof beam in a hydrostatic level, cylindrical cursory descends and rises respectively, the pressure of equal strength cantilever beam reduces respectively and increases simultaneously, fiber grating meets an emergency and diminishes respectively and the grow, fiber grating demodulator constitutes collection system and obtains wavelength variation numerical value.
The utility model has the advantages of as follows:
1. when the cylindrical buoy moves up and down, the constant-strength cantilever beam deforms and transmits strain to the fiber grating, and the wavelength change can be obtained through a fiber grating demodulator;
2. after liquid is injected into the cylindrical container, the cylindrical buoy changes along with the change of the height of the liquid level due to the buoyancy of the liquid, so that the constant-strength cantilever beam deforms, and the strain of the fiber bragg grating also changes;
3. the connection of each part of the static water level adopts strict mechanical connection, can be disassembled at any time and can be assembled after being disassembled;
4. two completely same static leveling devices are placed at the same height, the bottoms of the two completely same static leveling devices are connected through a water pipe to form a communicating device, and the liquid level elevations are always kept the same; if the two static levels are not at the same height, due to the communicating vessel, the liquid in one static level flows to the beam and the other static level, the cylindrical floats respectively descend and ascend, and simultaneously the equal-strength cantilever beams are driven to deform, and the strain of the fiber bragg gratings also changes;
5. by analyzing that the difference value of the two fiber bragg grating strains is in a linear relation with the height difference of the two cylindrical containers, the height difference of the two cylindrical containers can be expressed by the difference value of the two fiber bragg grating strains;
6. The most important factors that may cause errors in the fiber grating measurements are temperature changes and liquid evaporation that causes the liquid level to drop. However, the difference value of the strain of the two fiber gratings is used for representing the height difference of the two cylindrical containers, and the liquid level reduction caused by the temperature change and the liquid evaporation can enable the data measured by the two fiber gratings to be increased and reduced at the same time, so that the device can automatically eliminate the error caused by the liquid level reduction caused by the temperature change and the liquid evaporation.
Drawings
FIG. 1 is a schematic view of a hydrostatic level configuration;
fig. 2 is a schematic diagram of the operation of a dual fiber grating hydrostatic level.
In the figure, 1 is a cylindrical container; 2 is a cylindrical float; 3 is a cantilever beam with equal strength; 4, an L-shaped flange wood board; 5 is a bottom support; and 6 is a water pipe.
Detailed Description
As shown in fig. 1-2, the hydrostatic level of the double fiber bragg gratings comprises a cylindrical container 1, a connecting rod 2, a cylindrical float 3, an equal-strength cantilever beam 4 and a bottom support 5;
the cylindrical buoy 3 is fixed at the lower part of the top point of the equal-strength cantilever beam 4 through the connecting rod 2;
the fiber bragg grating is adhered to the lower surface of the equal-strength cantilever beam 4;
the cylindrical buoy 3, the connecting rod 2 and the equal-strength cantilever beam 4 are all arranged in the cylindrical container 1;
The constant-strength cantilever beam 4 is vertically adhered to the inner wall of the cylindrical container 1 and forms a whole with the fiber bragg grating, the connecting rod 2 and the cylindrical buoy 3;
the cylindrical container 1 is fixedly placed on a bottom support 5;
two completely the same hydrostatic levels are placed at the same height, and the bottoms are connected through a water pipe 7 to form a communicating vessel, and the liquid level height is always kept the same.
After the liquid is injected into the cylindrical container 1, the cylindrical float 3 changes along with the change of the height of the liquid level due to the buoyancy of the liquid, so that the constant-strength cantilever beam 4 deforms, and the strain of the fiber grating also changes.
The cylindrical container 1, the connecting rod 2, the cylindrical buoy 3, the equal-strength cantilever beam 4 and the bottom support 5 are mechanically connected and can be disassembled at any time and then assembled after being disassembled.
When two hydrostatic levels are not at the same height, because the linker, the liquid in a hydrostatic level flows to a hydrostatic level of roof beam, and cylindrical cursory descends respectively and rises, drives the constant strength cantilever beam deformation simultaneously, and fiber grating's meeting an emergency also changes.
After analysis, the difference value of the two fiber bragg grating strains is in a linear relation with the height difference of the two cylindrical containers, so that the difference value of the two fiber bragg grating strains can be used for representing the height difference of the two cylindrical containers.
The most important factors that may cause errors in the fiber grating measurements are temperature changes and liquid evaporation that causes the liquid level to drop. However, the difference value of the strain of the two fiber gratings is used for representing the height difference of the two cylindrical containers, and the liquid level reduction caused by the temperature change and the liquid evaporation can enable the data measured by the two fiber gratings to be increased and reduced at the same time, so that the device can automatically eliminate the error caused by the liquid level reduction caused by the temperature change and the liquid evaporation.
The static level of the double fiber bragg gratings is installed by the following steps: firstly, a cylindrical buoy 3 is fixed on the lower portion of the top point of the equal-strength beam through a connecting rod 2, an optical fiber grating is adhered to the lower surface of an equal-strength cantilever beam 4, the cylindrical buoy 3, the connecting rod 2 and the equal-strength cantilever beam 4 are all placed inside a cylindrical container 1, and the cylindrical container 1 is placed on a bottom support 5 and is fixed. The cantilever beam 4 with equal strength is vertically stuck on the inner wall of the cylindrical container 1. Two identical hydrostatic levels place at same height, the bottom is through water piping connection, form the linker, inject into liquid, 3 equal strength cantilever beams of cylindrical cursory 4 produce pressure, two hydrostatic levels are not when same height, because the linker, hydrostatic level of liquid flow direction roof beam in a hydrostatic level, cylindrical cursory 3 descends respectively and rises, the pressure of equal strength cantilever beam 4 reduces respectively and increases simultaneously, fiber grating meets an emergency and diminishes respectively and the grow, fiber grating demodulator constitutes collection system and obtains wavelength variation numerical value.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120468468.9U CN214666781U (en) | 2021-03-04 | 2021-03-04 | Double-fiber grating static level |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120468468.9U CN214666781U (en) | 2021-03-04 | 2021-03-04 | Double-fiber grating static level |
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| Publication Number | Publication Date |
|---|---|
| CN214666781U true CN214666781U (en) | 2021-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120468468.9U Expired - Fee Related CN214666781U (en) | 2021-03-04 | 2021-03-04 | Double-fiber grating static level |
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| Country | Link |
|---|---|
| CN (1) | CN214666781U (en) |
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2021
- 2021-03-04 CN CN202120468468.9U patent/CN214666781U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211109 |
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