Fiber bragg grating static displacement meter
By setting the vent pipe and the communication pipe in the fiber grating static displacement meter, unifying the air pressure and temperature environment, and using a disperser to stabilize the liquid level, the measurement error problems caused by environmental differences are solved, and the measurement accuracy and stability are improved.
Patent Information
- Application Number
- CN202421994398.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-16
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-08-16
AI Technical Summary
When using two fiber gratings static displacement timing, environmental differences lead to abnormal strain gratings, affecting measurement accuracy.
By setting a vent pipe and a communication pipe in the fiber grating static displacement meter, the air pressure and temperature environment inside the two are unified, and a disperser is installed at the water inlet pipe to stabilize the liquid level and ensure the stability of the float.
The measurement accuracy and stability of the fiber grating static displacement meter under different environmental conditions is achieved, reducing the impact of environmental factors on the measurement.
Smart Images
Figure CN223091283U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fiber grating sensing monitoring, in particular to a fiber grating static displacement meter. Background Art
[0002] The fiber grating static displacement meter is an advanced measuring instrument that combines fiber grating sensors and static leveling measurement technology and can accurately measure the settlement and inclination of buildings or infrastructures. A strain grating is arranged inside the fiber grating static level gauge. The strain grating corresponds to a floating cylinder through a strain beam. The change in the liquid level height will cause the buoyancy of the floating cylinder to change, and then cause the optical wavelength of the strain grating to change.
[0003] To ensure the measurement accuracy, usually two fiber grating static displacement meters are used in linkage to prevent errors caused by environmental impacts in a single fiber grating static displacement meter and affect the measurement accuracy. However, when two fiber grating static displacement meters are connected and used, once the internal environments of the two are different and the strain grating shows abnormal detection, the measurement will deviate. Content of the Utility Model
[0004] Aiming at the above defects, the utility model provides a fiber grating static displacement meter. When two fiber grating static displacement meters are connected and used, the internal environments of the two can be unified, reducing the abnormality of the strain grating caused by different environments and making the measurement more accurate.
[0005] To achieve the above purpose, the utility model provides the following technical solution: A fiber grating static displacement meter includes a cylinder body. The cylinder body is filled with liquid. A water inlet pipe is arranged on one side of the lower part of the cylinder body. A disperser is arranged at the end of the water inlet pipe inside the cylinder body. A connecting pipe is arranged on the side of the lower part of the cylinder body away from the water inlet pipe. A ventilation pipe is arranged on the side of the upper part of the cylinder body where the connecting pipe is located. An installation groove is arranged at the top of the cylinder body. A cover plate is fitted in the installation groove. An equal-strength stress beam is fixed at the center of the bottom of the cover plate. A fiber grating is pasted on the equal-strength stress beam. A steel wire rope is fixedly connected to the center of the bottom of the equal-strength stress beam. The bottom of the steel wire rope is fixedly connected to a floating cylinder.
[0006] As a further improvement of the utility model, an air inlet pipe is arranged on the side of the upper part of the cylinder body where the water inlet pipe is located.
[0007] As a further improvement of the utility model, a disc-shaped base is fixedly connected to the bottom of the cylinder body.
[0008] As a further improvement of the utility model, the shape of the cylinder body is a cuboid.
[0009] As a further improvement of the present utility model, the disperser includes a housing, a transition cavity is arranged inside the housing, and a plurality of water outlet holes are arranged in the circumferential direction of the housing in the horizontal direction.
[0010] As a further improvement of the present utility model, the disperser is located at the center of the horizontal plane inside the cylinder.
[0011] As a further improvement of the present utility model, two connecting columns are fixedly connected to the center of the bottom of the cover plate, and both ends of the top of the equal-strength stress beam are respectively pasted to the bottoms of the two connecting columns.
[0012] As a further improvement of the present utility model, a handle is fixedly connected to the top of the cover plate.
[0013] As a further improvement of the present utility model, the fiber Bragg grating is pasted on the two long side edges of the equal-strength stress beam.
[0014] As a further improvement of the present utility model, a valve is arranged at the end of the water inlet pipe outside the cylinder.
[0015] Advantages of the present utility model:
[0016] 1. By providing a ventilation pipe, the interiors of two mutually cooperating fiber Bragg grating displacement gauges can be connected. When the liquid evaporation or pressure change occurs in one of the fiber Bragg grating displacement gauges due to environmental influence, the environmental factors such as air pressure and temperature inside the two fiber Bragg grating displacement gauges can be unified through the ventilation pipe. At the same time, the present device is also provided with an air inlet pipe connected to the atmosphere, which can further maintain the internal environmental factors of the two fiber Bragg grating displacement gauges.
[0017] 2. By providing a disperser at the water inlet pipe, the water injection into the device can be made more stable, preventing the floating cylinder from constantly shaking due to the undulating and surging liquid level, which affects the initial calibration. Description of the drawings
[0018] Figure 1 is an axonometric view of the fiber Bragg grating static displacement gauge of the present utility model;
[0019] Figure 2 is a schematic diagram of the internal structure of the fiber Bragg grating static displacement gauge;
[0020] Figure 3 is Figure 2 the enlarged view of part A in
[0021] Figure 4 is Figure 2 the enlarged view of part B in
[0022] Figure 5 is the connection schematic diagram in the working state.
[0023] In the figure: 1 - cylinder body, 100 - water inlet pipe, 101 - air inlet pipe, 102 - installation groove, 103 - ventilation pipe, 104 - connecting pipe; 2 - cover plate, 200 - connecting column; 3 - grip, 4 - base, 5 - support plate, 6 - valve, 7 - equal-strength stress beam, 8 - steel wire rope, 9 - buoy, 10 - distributor, 1000 - housing, 1001 - transition cavity, 1002 - water outlet hole. Detailed implementation mode
[0024] In order to make the purpose, technical solution and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific examples described herein are only used to explain the present utility model and are not used to limit the present utility model. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or back, etc., are only with reference to the direction of the accompanying drawings. Therefore, the directional terms used are for illustration and not for limiting the present utility model. In addition, in all embodiments, the same reference numerals represent the same elements.
[0025] As Figures 1 to 4 shown, an optical fiber grating static displacement meter includes a cylinder body 1, and the shape of the cylinder body 1 is a cuboid. A disc-shaped base 4 is fixedly connected to the bottom of the cylinder body 1, and a triangular support plate 5 is fixedly connected between the base 4 and the cylinder body 1.
[0026] A water cavity is provided inside the cylinder body 1, and the water cavity is also a cuboid, and a liquid is contained inside the water cavity. A connecting pipe 104 is provided on one side of the lower part of the cylinder body 1, one end of the connecting pipe 104 communicates with the water cavity inside the cylinder body 1, and the other end of the connecting pipe 104 penetrates out of the cylinder body 1 and can be used to connect other pipelines.
[0027] On the other side of the lower part of the cylinder body 1, a water inlet pipe 100 is provided, a valve 6 is provided at the water inlet pipe 100, one end of the water inlet pipe 100 is located outside the cylinder body 1 and can be used to connect other pipelines, and the other end of the water inlet pipe 100 directly penetrates into the inside of the cylinder body 1. A distributor 10 is fixedly connected to the end of the water inlet pipe 100 inside the cylinder body 1, and the distributor 10 is located at the center of the horizontal plane inside the cylinder body 1.
[0028] The distributor 10 includes a hollow housing 1000, the inside of the housing 1000 is a transition cavity 1001, one end of the transition cavity 1001 communicates with the water inlet pipe 100, and a plurality of water outlet holes 1002 are opened on the side wall of the housing 1000, and the water outlet holes 1002 are all arranged in the horizontal direction.
[0029] On the upper part of the cylinder body 1 and on the same side as the connecting pipe 104, there is a vent pipe 103. One end of the vent pipe 103 is connected to the inside of the cylinder body 1, and the other end of the vent pipe 103 passes through the cylinder body 1 and can be used to connect to other pipelines. On the upper part of the cylinder body 1 and on the same side as the water inlet pipe 100, there is an air inlet pipe 101. The side of the air inlet pipe 101 close to the cylinder body 1 is connected to the inside of the cylinder body 1, and the side of the air inlet pipe 101 far from the cylinder body 1 is directly connected to the atmosphere.
[0030] As a further illustration of this embodiment, the air inlet pipe 101 is always connected to the atmosphere. The air inlet pipe 101 can maintain the temperature and air pressure inside the cylinder body 1 to be the same as that of the atmosphere, preventing the internal environment of the cylinder body 1 from being abnormal.
[0031] On the inner side of the top of the cylinder body 1, there is a square - rectangular installation groove 102. A square - rectangular cover plate 2 is fitted in the installation groove 102. A handle 3 is fixedly connected to the top of the cover plate 2. At the center of the bottom of the cover plate 2, two connecting columns 200 are fixedly connected. At the bottom of the connecting columns 200, an equal - strength stress beam 7 is pasted. The two connecting columns 200 are respectively fixed at both ends of the top of the equal - strength stress beam 7. The equal - strength stress beam 7 is in the shape of a rectangular block, and fiber Bragg gratings are pasted on both long sides of the equal - strength stress beam 7. The fiber Bragg gratings are connected to a fiber Bragg grating demodulator through optical fibers.
[0032] As a further illustration of this embodiment, by only fixing the ends of the equal - strength stress beam 7 through the connecting columns 200, the deformation of the equal - strength stress beam 7 can be greater when it is stressed, and further, the wavelength change generated by the fiber Bragg gratings pasted on the equal - strength stress beam 7 is more obvious, which is convenient for measurement.
[0033] As a further illustration of this embodiment, the fiber Bragg grating demodulator can demodulate the optical signals generated by the fiber Bragg gratings due to strain into electrical signals, and further process them into readable measurement data, and these measurement results will be directly displayed on the display screen of the demodulator.
[0034] At the center of the bottom of the equal - strength stress beam 7, a steel wire rope 8 is fixedly connected. At the bottom of the steel wire rope 8, a floating cylinder 9 is fixedly connected. The floating cylinder 9 is cylindrical and hollow inside, and can float on the upper surface of the liquid inside the cylinder body.
[0035] The working principle and usage process of the utility model:
[0036] First, the device needs to be calibrated. Place two fiber Bragg grating static displacement gauges on the horizontal ground. Connect the two ends of the water pipe to the connecting pipes 104 of the fiber Bragg grating static displacement gauges respectively, so that the lower parts of the fiber Bragg grating static displacement gauges are interconnected. Then connect the two ends of the air pipe to the vent pipes 103 of the fiber Bragg grating static displacement gauges respectively, so that the upper parts of the fiber Bragg grating static displacement gauges are interconnected.
[0037] Connect the water inlet pipes 100 of two fiber optic static displacement gauges to a water supply device through pipelines. The water supply device supplies water into the cylinder body 1. As the water level rises, the liquid contacts the floating cylinder 9, causing the floating cylinder 9 to rise continuously. At the same time, when the water level exceeds the height of the communicating pipe 104, the communicating pipes 104 communicate with each other, making the water levels in the two cylinder bodies 1 continuously balanced and reach the same level. At this time, continuously observe the data on the fiber optic grating demodulator. When the calibration number is reached, stop supplying water into the cylinder body 1 and close the valve 6 at the water inlet pipe 100 (the water level is always below the vent pipe 103).
[0038] To prevent the liquid from surging in large quantities during liquid injection, causing the liquid level at the top to agitate and making the floating cylinder 9 shake continuously, which affects calibration, a distributor 10 is provided at the end of the liquid inlet pipe in the cylinder body 1. The liquid enters the transition cavity 1001 of the distributor 10 from the liquid inlet pipe and is sprayed horizontally into the cylinder body 1 through the water outlet holes 1002 on the distributor 10, making the floating cylinder 9 rise stably without shaking.
[0039] At this time, the water levels inside the two fiber optic static displacement gauges are the same, the heights of the floating cylinders 9 inside the cylinder body 1 are the same, the floating cylinder 9 makes the deformations of the equal-strength stress beam 7 consistent through the steel wire rope 8, and the strains generated by the fiber optic gratings pasted on both sides of the equal-strength stress beam 7 are the same. Thus, the data transmitted to the fiber optic grating demodulator is the same. At this time, the device is at the starting horizontal position.
[0040] Move the device to the measurement location. When the two static level gauges are not at the same height, they communicate with each other through the communicating pipe 104. The liquid in one static level gauge will flow to the other static level gauge. The floating cylinders 9 inside the two cylinder bodies 1 descend and rise respectively. At the same time, the pressures on the equal-strength stress beam 7 decrease and increase respectively, the fiber optic grating strains become smaller and larger respectively, and the fiber optic grating demodulator forms an acquisition system to obtain the wavelength change value and display the height difference, thus completing the measurement of the inclination height. During the measurement process, the air pipes on the upper part of the cylinder body 1 communicate with the gas inside the cylinder body 1, making the reaction conditions inside the cylinder body 1, such as temperature, pressure, etc., always consistent, so as to ensure the stability of the measurement.
[0041] The above is only the preferred implementation mode of the present invention. The protection scope of the present invention is not limited to the above implementation measures. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, several improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.
Claims
1. An optical fiber grating static displacement gauge, characterized in that, It includes a cylinder body (1) which contains liquid inside. One side of the lower part of the cylinder body (1) is provided with a water inlet pipe (100). The end of the water inlet pipe (100) inside the cylinder body (1) is provided with a disperser (10). One side of the lower part of the cylinder body (1) far away from the water inlet pipe (100) is provided with a connecting pipe (104). One side of the upper part of the cylinder body (1) where the connecting pipe (104) is located is provided with a ventilation pipe (103). The top of the cylinder body (1) is provided with a mounting groove (102), and a cover plate (2) is fitted in the mounting groove (102). At the center of the bottom of the cover plate (2), an equal-strength stress beam (7) is fixed. A fiber Bragg grating is pasted on the equal-strength stress beam (7). At the center of the bottom of the equal-strength stress beam (7), a steel wire rope (8) is fixedly connected. The bottom of the steel wire rope (8) is fixedly connected with a floating cylinder (9).
2. The fiber Bragg grating static displacement gauge according to claim 1, characterized in that, One side of the upper part of the cylinder body (1) where the water inlet pipe (100) is located is provided with an air inlet pipe (101).
3. The fiber Bragg grating static displacement gauge according to claim 1, wherein The bottom of the cylinder body (1) is fixedly connected with a disc-shaped base (4).
4. The fiber Bragg grating static displacement gauge according to claim 1, characterized in that, The shape of the cylinder body (1) is a cuboid.
5. The fiber Bragg grating static displacement gauge according to claim 1, characterized in that, The disperser (10) includes a housing (1000). A transition cavity (1001) is arranged inside the housing (1000). A plurality of water outlet holes (1002) are arranged horizontally on the circumference of the housing (1000).
6. The fiber Bragg grating static displacement gauge according to claim 5, wherein The disperser (10) is located at the center of the horizontal plane inside the cylinder body (1).
7. The fiber Bragg grating static displacement gauge according to claim 1, wherein, Two connecting columns (200) are fixedly connected to the center of the bottom of the cover plate (2). The two ends of the top of the equal-strength stress beam (7) are respectively pasted on the bottoms of the two connecting columns (200).
8. The fiber Bragg grating static displacement gauge according to claim 1, wherein A handle (3) is fixedly connected to the top of the cover plate (2).
9. The fiber Bragg grating static displacement gauge according to claim 1, characterized in that, The fiber Bragg grating is pasted on the two long side edges of the equal-strength stress beam (7).
10. The fiber Bragg grating static displacement gauge according to claim 1, characterized in that, A valve (6) is arranged at the end of the water inlet pipe (100) outside the cylinder body (1).