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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- cantilever beam
- equal
- strength cantilever
- connecting rod
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Abstract
The utility model discloses a static level of double fiber gratings, which comprises a cylinder 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 peak of the equal-strength cantilever beam through a connecting rod; the fiber 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 constant-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 arranged on the bottom support; two completely same static levels are placed at the same height, the bottoms of the two completely same static levels are connected through a water pipe to form a communicating vessel, and the liquid level elevation is always kept the same. The utility model discloses establish the poor quantitative relation formula with the structural displacement difference of two fiber grating wavelength, avoided temperature stress, liquid evaporation to the influence of fiber grating wavelength drift, realized fiber grating sensor's long-term monitoring.
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)
1. A kind of hydrostatic level of the double fiber bragg grating, characterized by that: the static level 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 same static levels are placed at the same height, the bottoms of the two completely same static levels are connected through a water pipe to form a communicating vessel, and the liquid level elevation is always kept the same.
2. A dual fiber grating hydrostatic level as claimed in claim 1, wherein: 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. A dual fiber grating hydrostatic level as claimed in claim 1, wherein: 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.
4. A dual fiber grating hydrostatic level as claimed in claim 1, wherein: when two hydrostatic levels are not at the same height, because the linker, the liquid in a hydrostatic level flows to another hydrostatic level, and the cylindrical buoy descends and rises respectively, drives the equal strength cantilever beam deformation simultaneously, and fiber grating's meeting an emergency also changes.
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 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214666781U true CN214666781U (en) | 2021-11-09 |
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Family Applications (1)
| 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 |
Country Status (1)
| 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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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211109 |