CN202692980U - Cup-type optical fiber Bragg grating settlement meter - Google Patents
Cup-type optical fiber Bragg grating settlement meter Download PDFInfo
- Publication number
- CN202692980U CN202692980U CN201220348320.2U CN201220348320U CN202692980U CN 202692980 U CN202692980 U CN 202692980U CN 201220348320 U CN201220348320 U CN 201220348320U CN 202692980 U CN202692980 U CN 202692980U
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- container
- fiber bragg
- liquid level
- level sensor
- 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.)
- Expired - Fee Related
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 72
- 239000007788 liquid Substances 0.000 claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000002184 metal Substances 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 9
- -1 spherical container Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 13
- 238000005259 measurement Methods 0.000 abstract description 7
- 238000012545 processing Methods 0.000 abstract description 2
- 230000003287 optical effect Effects 0.000 abstract 1
- 238000004062 sedimentation Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 230000008033 biological extinction Effects 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000013178 mathematical model Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Abstract
The utility model relates to a cup-type optical fiber Bragg grating settlement meter, and belongs to the technical field of optical electronic measurement devices. Water is filled in a cuboid container and a spherical container, the containers are filled with water, and the cuboid container is communicated with the spherical container through a coiled pipe to form a sealed container; a cavity is formed among the coiled pipe, and an internal housing and an external housing of the spherical container, and an optical fiber is led out of the cavity; and a grating liquid level sensor and an optical fiber Bragg grating liquid level sensor in the same structure are respectively arranged in the cuboid container and the spherical container and connected with an external signal processing device through the optical fiber. According to the settlement meter, the influence of atmosphere pressure on settlement observation is offset by using a differential pressure method, and the measurement accuracy is improved; and due to the difference of a sensing grating responsive to temperature and pressure, temperature and liquid level can be simultaneously measured, and compensation to interference of temperature fluctuation can be realized.
Description
Technical field
The utility model relates to a kind of water tumbler formula optical fiber Bragg raster sedimentometer, belongs to the photoelectron field of measuring technique.
Background technology
Ground settlement claims again sinking of ground or earth subsidence, refers to the phenomenon that the day water plane that occurs in certain surface area reduces.Ground settlement will cause the breaking-up of buildings and production facility, and therefore, for guaranteeing the safe operation of engineering, supervision construction quality and prevention engineering accident need skyscraper is carried out settlement measurement.The ground settlement view is that a kind of elevation according to periodic measurement deflection working point changes the equipment that calculates the ground settlement amount, can be used in the ground settlement observation of the engineerings such as dykes and dams, highway, railway, reinforcing soft foundation.Water-pipe type settlement instrument utilizes gas outlet to guarantee that air pressure and external atmosphere pressure in the pipeline balance each other, this gas outlet easily stops up, cause the increase of measuring error, degree of accuracy can not be guaranteed, and seriously be subject to human factor and weather condition (among Lee, Li Jie, Zheng Shuihua, " some innovative approach of water-pipe type settlement instrument " " automation of hydropower projects and dam monitoring ", 12 monthly magazines in 2010, the 6th phase the 34th volume).
The utility model content
For the problems referred to above, a kind of water tumbler formula of the utility model optical fiber Bragg raster sedimentometer adopts optical fiber Bragg grating sensor and linker to combine the sedimentation of Measurement of Dam contour level building, utilizes differential pressure method, balance out atmospheric pressure to the impact of settlement observation, improved measuring accuracy; Utilization is pasted on the sensing grating on the upper and lower surface of equi intensity cantilever to the otherness of pressure and temperature response, measure when can realize temperature and liquid level, and realization is to the compensation of temperature fluctuations disturb.
The technical solution adopted in the utility model: a kind of water tumbler formula optical fiber Bragg raster sedimentometer is characterized in that: comprising: cuboid container 1, optical fiber Bragg raster liquid level sensor
2, coiled pipe 3, optical fiber 4, spherical container 5, optical fiber Bragg raster liquid level sensor
6; Cuboid container 1 and spherical container 5 all are equipped with water, and water is housed in the container, and cuboid container 1 is linked to each other by coiled pipe 3 with spherical container 5 and communicates, and consists of a closed container; Be a cavity between coiled pipe 3 and the spherical container 5 inside and outside shells, optical fiber 4 is drawn from cavity; Be placed with respectively the identical optical fiber Bragg raster liquid level sensor of structure in cuboid container 1 and the spherical container 5
2 and optical fiber Bragg raster liquid level sensor
6, optical fiber Bragg raster liquid level sensor
2 and optical fiber Bragg raster liquid level sensor
6 are connected with external signal treating apparatus 13 by optical fiber 12 respectively.
Described optical fiber Bragg raster liquid level sensor consists of an airtight cavity for circle convoluted diaphragm 7 and canister 9, the vertical fixing metal pressure transmission in equi intensity cantilever 11 tops bar 8, the geometric center of the top contact circle convoluted diaphragm 7 of metal pressure transmission bar 8 is posted optical fiber Bragg raster 10 in the stiff end upper and lower surface of equi intensity cantilever 11.
The water surface at cuboid container 1 and spherical container 5 is added with one deck oil, like this can the enhanced leaktightness effect.
Described cuboid container 1, coiled pipe 3, optical fiber 4, spherical container 5, circle convoluted diaphragm 7, canister 9, optical fiber Bragg raster 10 is commercially available common components; Optical fiber Bragg raster liquid level sensor
2, optical fiber Bragg raster liquid level sensor
6, metal pressure transmission bar 8, equi intensity cantilever 11 can adopt conventional method processing.
The beneficial effects of the utility model are: adopt optical fiber Bragg grating sensor and linker to combine the sedimentation of Measurement of Dam contour level building, utilize differential pressure method, balance out atmospheric pressure to the impact of settlement observation, improved measuring accuracy; Utilization is pasted on the sensing grating on the upper and lower surface of equi intensity cantilever to the otherness of pressure and temperature response, measure when can realize temperature and liquid level, and realization is to the compensation of temperature fluctuations disturb.
Description of drawings
Fig. 1 is water tumbler formula Bragg fiber grating sedimentometer structural representation;
Fig. 2 is fiber Bragg Fiber Grating Liquid Depth Sensor structural drawing.
Among the figure: 1-cuboid container, 2-optical fiber Bragg raster liquid level sensor, 3-coiled pipe, 4-optical fiber, the 5-spherical container, 6-optical fiber Bragg raster liquid level sensor, 7-circle convoluted diaphragm, 8-metal pressure transmission bar, the 9-metal shell, 10-optical fiber Bragg raster, 11-equi intensity cantilever, 12-optical fiber, 13-external signal treating apparatus.
Embodiment
Below in conjunction with drawings and Examples the utility model is described further, understands to make things convenient for the technician.
As shown in Figure 1: water tumbler formula optical fiber Bragg raster sedimentometer is characterized in that: comprising: cuboid container 1, optical fiber Bragg raster liquid level sensor
2, coiled pipe 3, optical fiber 4, spherical container 5, optical fiber Bragg raster liquid level sensor
6; Cuboid container 1 and spherical container 5 all are equipped with water, in the container lower floor water are housed, and there is a certain amount of oil on the upper strata, to improve cuboid container 1 sealing; Cuboid container 1 is linked to each other by coiled pipe 3 with spherical container 5 and communicates, and consists of a closed container; Be a cavity between coiled pipe 3 and the spherical container 5 inside and outside shells, optical fiber 4 is drawn from cavity; Be placed with respectively the identical optical fiber Bragg raster liquid level sensor of structure in cuboid container 1 and the spherical container 5
2 and optical fiber Bragg raster liquid level sensor
6, optical fiber Bragg raster liquid level sensor
2 and optical fiber Bragg raster liquid level sensor
6 are connected with external signal treating apparatus 13 by optical fiber 12 respectively.
As shown in Figure 2: described optical fiber Bragg raster liquid level sensor consists of an airtight cavity for circle convoluted diaphragm 7 and canister 9, the vertical fixing metal pressure transmission in equi intensity cantilever 11 tops bar 8, the geometric center of the top contact circle convoluted diaphragm 7 of metal pressure transmission bar 8 is posted optical fiber Bragg raster 10 in the stiff end upper and lower surface of equi intensity cantilever 11.
The water surface at cuboid container 1 and spherical container 5 is added with one deck oil, like this can the enhanced leaktightness effect.
The using method of water tumbler formula optical fiber Bragg raster sedimentometer, the using method of described water tumbler formula optical fiber Bragg raster sedimentometer is that cuboid container 1 is fixed on not on the pedestal with dam body settlement, when having sedimentation to occur, liquid level difference increases, the water pressure that acts on the round convoluted diaphragm 7 increases, round convoluted diaphragm 7 deformation are changed, cause that further wavelength-shift occurs the optical fiber Bragg raster 10 that sticks on equi intensity cantilever 11, optical fiber Bragg raster 10 is by external optical fiber 12, utilize external signal treating apparatus 13 to obtain the shift value of optical fiber Bragg raster 10 centre wavelengths, utilize formula
, in the formula
The valid round backscatter extinction logarithmic ratio,
Be the centre wavelength of optical fiber Bragg raster,
Be the shift amount of wavelength, p is pressure, and t is the thickness of circle convoluted diaphragm 7, and r is the working portion radius of circle convoluted diaphragm 7, and a is the radius of circle convoluted diaphragm 7 any parts, and E is the elastic modulus of circle convoluted diaphragm 7 materials,
The density of circle convoluted diaphragm 7 materials,
Be the Poisson ratio of circle convoluted diaphragm 7 materials,
Be the thickness of equi intensity cantilever 11,
Length for equi intensity cantilever 11, g is Gravitational coefficient of the Earth, h is liquid level, thereby calculate the hydraulic pressure value at measuring point place, according to the differential pressure method principle, can calculate two liquid levels between the optical fiber Bragg raster liquid level sensor, deduct the liquid level between sedimentation the first two optical fiber Bragg raster liquid level sensor, settling amount that must dam body.
The mathematical model of the utility model measuring technique is as follows:
The wavelength-shift that the even axial strain of fiber grating causes is:
In the formula (1), the valid round backscatter extinction logarithmic ratio
,
Be the centre wavelength of optical fiber Bragg raster,
Be the shift amount of wavelength,
Be tangential strain.
Suppose that circle convoluted diaphragm periphery is solid propping up, there is equally distributed pressure-acting circle convoluted diaphragm bottom surface, makes round convoluted diaphragm generation deformation (establish it and be in little winding degree state), and according to circular sheet small deflection Deformation Theory, the amount of deflection that the circle convoluted diaphragm produces is:
Have formula (2) to learn, the amount of deflection that (r=0) locates at the center is maximum, and its amount of deflection maximal value is:
The formula that satisfies the small deflection theory scope is:
(2) in formula, (3) formula (4) formula: p is pressure (Pa), t is circle convoluted diaphragm thickness (cm), r is the radius (cm) of circle convoluted diaphragm working portion, a is the radius (cm) of circle convoluted diaphragm any part, E is the elastic modulus (MPa) of circle convoluted diaphragm material
The density (kg/ of circle convoluted diaphragm material
),
For the pool of justifying the convoluted diaphragm material send the pine ratio.
The metal pressure transmission sense that the distortion of circle convoluted diaphragm promotes its below, center of circle moves down, and suitable, the equal-sized amount of deflection of compressing equi intensity cantilever generation direction changes, and namely the amount of deflection of equi intensity cantilever is changed to
Size along the axis direction strain on the equi intensity cantilever does not change with the difference of position, and its strain
With equi intensity cantilever free end amount of deflection
The pass be:
(5) in the formula,
Be the thickness of equi intensity cantilever,
For equi intensity cantilever length.
(3) formula is brought into (5) formula, the then strain on the equi intensity cantilever
With even cloth pressure
The pass be:
(6) formula substitution (1) formula, and pressure formula is arranged
, can get Bagg wavelength-shift and the liquid level of optical fiber Bragg raster
The pass be:
Formula (7) has shown the mathematical model between the Bragg wavelength-shift of liquid level h that liquid level sensor is suffered and optical fiber Bragg raster, and the Bragg wavelength-shift by measuring optical fiber Bragg grating can calculate liquid level.
For closed container, what we adopted is that differential pressure method is measured liquid level.Before the sedimentation, suppose that the pressure that the liquid level sensor in the cuboid container records is
, liquid level is A, the pressure that the liquid level sensor in the spherical container records is
, liquid level is B, then can be got by differential pressure method:
Can get liquid level between front two liquid level sensors of sedimentation by (8) formula.When there being sedimentation to occur, and variation also occured in the liquid level in the cuboid container, and the pressure that the liquid level sensor in the cuboid container of suppose to record at this moment records is
, liquid level is a, the pressure that the liquid level sensor in the spherical container records is
, liquid level is b, can be got by differential pressure method equally:
(7), in (8), (9) formula
(density of water),
(Gravitational coefficient of the Earth), h are liquid level.
(9) formula can get the liquid level between two liquid level sensors after the sedimentation, by (8) formula and (9) formula, can get the settling amount of dam
, as shown in Figure 1.
Specific embodiment
Design parameter in actual fabrication is:
1, justify convoluted diaphragm 7 materials: constant elastic alloy 3J53,, Young's modulus of elasticity
GPa, Poisson ratio
2, justify convoluted diaphragm 7 sizes: radius
Mm,
Mm, thickness t=0.5mm;
3, the length of equi intensity cantilever 11
Mm, thickness
Mm,
4, coiled pipe size: length 2m;
5, optical fiber Bragg raster 10 technical parameters: centre wavelength
Nm, valid round-backscatter extinction logarithmic ratio
6, cuboid container 1 has coiled pipe 3 to link to each other with spherical container 5 to communicate, and coiled pipe adopts that two-port is threaded a fine flexible tube, and two containers can be connected preferably with coiled pipe.
7, with external signal treating apparatus 13, obtain the Bragg wavelength of optical fiber Bragg raster;
8, according to formula (8), the Bragg wavelength-shift of optical fiber Bragg raster to the response sensitivity of liquid level is:
（10）
With known quantity substitution formula (10), theory is calculated and is shown, when the wavelength resolution of optical fiber Bragg raster (FBG) demodulator was 1pm, the resolution of this sensor was 0.3987cm=3.987mm.According to circular sheet small deflection Deformation Theory, the amount of deflection variable quantity of circle convoluted diaphragm should be less than 1/3 of circle convoluted diaphragm thickness, and theoretical maximum range that can this liquid level sensor is 0.03048MPa.By pressure formula
, the high 3m. of being to the maximum the result of calculation of its liquid level shows, the utlity model has high measurement resolution, measuring error is little, and the advantages such as good reproducibility, detectable subsidence range is (0-2) m simultaneously.
The utility model describes by specific implementation process, in the situation that do not break away from the utility model scope, can also carry out various conversion and be equal to replacement the utility model patent, therefore, the utility model patent is not limited to disclosed specific implementation process, and should comprise the whole embodiments that fall in the utility model Patent right requirement scope.
Claims (3)
1. a water tumbler formula optical fiber Bragg raster sedimentometer is characterized in that: comprise cuboid container, optical fiber Bragg raster liquid level sensor
, coiled pipe, optical fiber, spherical container, optical fiber Bragg raster liquid level sensor
Cuboid container and spherical container all are equipped with water, and water is housed in the container, and cuboid container is linked to each other by coiled pipe with spherical container and communicates, and consists of a closed container; Be a cavity between the inside and outside shell of coiled pipe and spherical container, optical fiber is drawn from cavity; Be placed with respectively the identical raster liquid level sensor of structure in cuboid container and the spherical container
And optical fiber Bragg raster liquid level sensor
, raster liquid level sensor
And optical fiber Bragg raster liquid level sensor
Be connected with the external signal treating apparatus by optical fiber.
2. a kind of water tumbler formula optical fiber Bragg raster sedimentometer according to claim 1, it is characterized in that: optical fiber Bragg raster liquid level sensor is that circle convoluted diaphragm and canister consist of an airtight cavity, the vertical fixing metal pressure transmission in equi intensity cantilever top bar, the geometric center of the top contact circle convoluted diaphragm of metal pressure transmission bar is posted optical fiber Bragg raster in the stiff end upper and lower surface of equi intensity cantilever.
3. a kind of water tumbler formula optical fiber Bragg raster sedimentometer according to claim 1, it is characterized in that: the water surface at cuboid container and spherical container is added with one deck oil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220348320.2U CN202692980U (en) | 2012-07-18 | 2012-07-18 | Cup-type optical fiber Bragg grating settlement meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220348320.2U CN202692980U (en) | 2012-07-18 | 2012-07-18 | Cup-type optical fiber Bragg grating settlement meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202692980U true CN202692980U (en) | 2013-01-23 |
Family
ID=47548588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220348320.2U Expired - Fee Related CN202692980U (en) | 2012-07-18 | 2012-07-18 | Cup-type optical fiber Bragg grating settlement meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202692980U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104697496A (en) * | 2015-04-03 | 2015-06-10 | 朱平 | Split type static hydraulic pressure difference settlement monitoring system and installation method thereof |
-
2012
- 2012-07-18 CN CN201220348320.2U patent/CN202692980U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104697496A (en) * | 2015-04-03 | 2015-06-10 | 朱平 | Split type static hydraulic pressure difference settlement monitoring system and installation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101718544B (en) | static level monitoring system | |
| CN102768035A (en) | Cup type optical fiber Bragg grating settlement meter and method of application for settlement meter | |
| CN103499678B (en) | Determinator for soil volume expansive force | |
| CN109945806B (en) | Two-dimensional fiber bragg grating inclination sensor | |
| CN104279986B (en) | Piston type hydrargyrum optical fiber Bragg grating tilt angle sensor and using method thereof | |
| CN101344372A (en) | Miniature built-in cantilever beam type displacement gage used for geomechanics model experiment | |
| CN103674179B (en) | Optical fiber Bragg optical grating liquid level sensor of differential type lever structure and using method thereof | |
| CN106643655A (en) | Gravity type fiber grating tilt sensor | |
| CN109811805A (en) | A kind of ring type bridge pile foundation flushing monitoring system and its monitoring method | |
| CN103076063A (en) | Optical fiber grating water and soil interface sensor and manufacturing and installation method thereof | |
| CN202692980U (en) | Cup-type optical fiber Bragg grating settlement meter | |
| CN206818742U (en) | Fiber grating flow rate of water flow sensor | |
| CN103901224A (en) | Three-dimensional ocean current sensor capable of measuring upwelling currents and method for measuring upwelling currents and horizontal currents | |
| CN210513509U (en) | Fiber grating pore water pressure sensor | |
| CN205280058U (en) | Differential type fiber grating hydrostatic level appearance | |
| CN103822609B (en) | A kind of two telescopic optical fiber Bragg raster sedimentometer | |
| CN205483167U (en) | Liquid level measuring apparatus | |
| CN201266072Y (en) | Miniature built-in cantilever beam type displacement gage used for geomechanics model experiment | |
| CN201043905Y (en) | Optical fiber grating percolation gauge | |
| CN102809521A (en) | Float type optical fiber Bragg grating density sensor of Pb-Sn (plumbum-stannum) molten alloy | |
| CN203519239U (en) | Piston type diamond structure fiber Bragg grating seepage pressure sensor | |
| CN207730958U (en) | Double with temperature self-compensation characteristic turn over funneling fiber grating rain sensor | |
| CN206496759U (en) | A kind of gravity type optical fiber grating inclination angle sensor | |
| CN211855297U (en) | Settlement measuring device based on fiber bragg grating | |
| CN208998774U (en) | Sedimentation amount of deflection sensor based on fiber grating |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130123 Termination date: 20150718 |
|
| EXPY | Termination of patent right or utility model |