CN111665182A - Inner tube water pressure expansion type fiber grating osmometer - Google Patents
Inner tube water pressure expansion type fiber grating osmometer Download PDFInfo
- Publication number
- CN111665182A CN111665182A CN202010554874.7A CN202010554874A CN111665182A CN 111665182 A CN111665182 A CN 111665182A CN 202010554874 A CN202010554874 A CN 202010554874A CN 111665182 A CN111665182 A CN 111665182A
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- water pressure
- fiber grating
- shell
- osmometer
- expansion type
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 239000000835 fiber Substances 0.000 title claims abstract description 56
- 238000007789 sealing Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 12
- 230000003287 optical effect Effects 0.000 claims description 9
- 230000008595 infiltration Effects 0.000 claims description 8
- 238000001764 infiltration Methods 0.000 claims description 8
- 238000004804 winding Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 abstract description 13
- 239000011148 porous material Substances 0.000 abstract description 9
- 230000035945 sensitivity Effects 0.000 abstract description 6
- 230000036541 health Effects 0.000 abstract description 3
- 239000013307 optical fiber Substances 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 6
- 239000003292 glue Substances 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N2015/0846—Investigating permeability, pore-volume, or surface area of porous materials by use of radiation, e.g. transmitted or reflected light
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The utility model provides an inner tube water pressure inflation formula fiber grating osmometer, it relates to a fiber grating osmometer, concretely relates to inner tube water pressure inflation formula fiber grating osmometer. The invention aims to solve the problems that the sensitivity and the measuring range of the existing fiber grating osmometer cannot be applied to monitoring projects with large pore water pressure variation range and high requirement on data precision. The fiber grating water seepage device comprises a fiber grating, an inner container, a shell and a water seepage cover component, wherein the inner container is inserted in the shell, the fiber grating is inserted in the inner container, and the water seepage cover component is buckled at an opening at the upper end of the shell. The invention belongs to the field of structural health monitoring.
Description
Technical Field
The invention relates to a fiber bragg grating osmometer, in particular to an inner cylinder water pressure expansion type fiber bragg grating osmometer, and belongs to the field of structural health monitoring.
Background
The pore water pressure generated inside the saturated/unsaturated soil body is considered as one of important factors causing the destruction of the large concrete structure. In the fields of civil and hydraulic engineering, such as the construction and use of structures like reservoir dams, bridge pile foundations, diversion tunnels, road beds and pavements, the pore water pressure inside a structure is often monitored in real time in a manner of burying osmometers inside the structure, so that the seepage-proofing effect of the structure is known, and the precursor of seepage damage is found in time. Compared with the traditional electric osmometers such as a damping type osmometer and a vibrating wire type osmometer, the fiber grating osmometer has the advantages of no need of electrifying, simple structure, small volume, high resolution, strong chemical and electromagnetic interference resistance and the like, and is widely applied to structural health monitoring of large structures at present. Meanwhile, the fiber grating sensor can write a plurality of gratings in one optical fiber to form a sensing array, and is combined with a wavelength division multiplexing and time division multiplexing system, so that multi-point distributed monitoring can be realized, and the application prospect is wide. However, due to the limitation of the structural form, the sensitivity and the measuring range of the existing fiber grating osmometer cannot be applied to monitoring projects with large pore water pressure variation range and high requirement on data accuracy. Therefore, the novel fiber grating osmometer is designed, the sensitivity and the measuring range of the osmometer are improved, and the osmometer has important engineering significance for improving the monitoring effect and reducing the monitoring cost.
Disclosure of Invention
The invention provides an inner cylinder water pressure expansion type fiber grating osmometer, aiming at solving the problems that the sensitivity and the measuring range of the existing fiber grating osmometer can not be applied to monitoring projects with larger pore water pressure change range and higher requirement on data precision.
The technical scheme adopted by the invention for solving the problems is as follows: the fiber grating water seepage device comprises a fiber grating, an inner container, a shell and a water seepage cover component, wherein the inner container is inserted into the shell, the fiber grating is wound on the outer wall of the inner container, and the water seepage cover component is buckled at an opening at the upper end of the shell.
Furthermore, the infiltration lid subassembly includes infiltration material and infiltration apron, and the infiltration material inlays the dress in the through-hole in infiltration apron upper surface middle part, and infiltration apron spiral-lock is at the opening part of casing upper end.
Furthermore, the water seepage cover plate is screwed at the opening at the upper end of the shell.
Furthermore, the invention also comprises an O-shaped sealing ring, wherein the O-shaped sealing ring is sleeved at the opening at the upper end of the shell, and the O-shaped sealing ring is positioned between the water seepage cover plate and the opening at the upper end of the shell.
Furthermore, the invention also comprises an outlet spiral tube and an armored optical cable, wherein the upper end of the outlet spiral tube is inserted into a screw hole in the middle of the bottom surface of the shell, and one end of the armored optical cable penetrates through the outlet spiral tube to be connected with the fiber bragg grating in the liner.
The invention has the beneficial effects that: the inner cylinder water pressure expansion type fiber bragg grating osmometer has a simple structure, is convenient to process and manufacture, and can be added with a plurality of fiber bragg gratings to realize temperature compensation; the material can also be integrally cast and formed, and is easy for large-scale production; the osmometer liner material meets the strength requirement and has good elasticity, and the fiber bragg grating is uniformly wound in the groove on the outer wall of the liner at a certain angle and deforms in cooperation with the liner, so that the monitoring range and sensitivity of the pore water pressure are greatly improved; before the novel fiber grating osmometer is put into use, the novel fiber grating osmometer can be subjected to parameter calibration by adopting a conventional electronic flowmeter and a portable demodulator, the stability is good, the operation is simple and convenient, and other special equipment is not required to be developed or purchased; the novel inner cylinder water pressure expansion type fiber grating osmometer has wider application range, the wall thickness of an inner container and adjustable winding angle, and can meet the engineering requirements of various measuring ranges and sensitivity; the invention can be used for long-term monitoring of pore water pressure. The fiber grating is wound and fixed in the groove on the outer wall of the liner, and the wavelength of the Bragg grating is changed due to the expansion and deformation of the liner. The inner container of the osmometer has good rebound resilience and large measuring range, and does not generate baseline drift; the fiber bragg grating is uniformly changed along with the pore water pressure, the linearity is high, and the monitoring range and the stability of the osmometer are greatly improved on the premise of meeting the monitoring precision.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of a water permeable cover plate;
FIG. 3 is a cross-sectional view of a weep cover plate;
FIG. 4 is a schematic structural diagram of the liner and the fiber grating;
FIG. 5 is a cross-sectional view of the liner;
FIG. 6 is a schematic structural view of the housing;
FIG. 7 is a cross-sectional view of the housing;
FIG. 8 is a schematic diagram of the structure of the outlet coil;
FIG. 9 is a cross-sectional view of the outlet coil;
FIG. 10 is a schematic structural view of an O-ring seal;
fig. 11 is a schematic structural view of an armored fiber optic cable.
Detailed Description
The first embodiment is as follows: the embodiment is described with reference to fig. 1 to 11, and the inner cylinder water pressure expansion type fiber bragg grating osmometer according to the embodiment includes a fiber bragg grating 3, an inner container 4, a housing 6 and a water permeable cover assembly, wherein the inner container 4 is inserted into the housing 6, the fiber bragg grating 3 is wound on the outer wall of the inner container 4, and the water permeable cover assembly is fastened at an opening at the upper end of the housing 6.
In this embodiment, the fiber grating 3 is wound in the notch of the outer wall of the inner container 4 and fixed by polymer glue.
The shell 6 is made of stainless steel materials, and has the functions of protecting the inner container 4 from being corroded by soil salt environment and supporting a framework and connecting all parts.
The inner container 4 is made of an elastomer material and is used for fixing the fiber grating 3, transmitting pore water pressure to cause the wavelength of the grating to change linearly and is directly connected with the shell 6, and enough space is ensured to be reserved between the inner container 4 and the shell 6 for the expansion and deformation of the inner container.
The central position of the fiber grating 3 is positioned on the outer wall of the inner container 4, the attaching angle of the fiber grating 3 to the outer wall of the inner container 4 is 0-90 degrees (an acute angle is formed between the fiber grating and the central axis of the inner container 4), and the wall thickness of the inner container 4 and the attaching angle of the fiber grating 3 can be adjusted according to engineering requirements.
The second embodiment is as follows: the present embodiment is described with reference to fig. 1 to 11, the water permeable cover assembly of the inner cylinder water pressure expansion type fiber grating osmometer according to the present embodiment includes a water permeable material 1 and a water permeable cover plate 2, the water permeable material 1 is embedded in a through hole in the middle of the upper surface of the water permeable cover plate 2, the water permeable cover plate 2 is fastened at an opening at the upper end of the housing 6, and other components and connection relations are the same as those of the first embodiment.
The third concrete implementation mode: referring to fig. 1 to 11, the present embodiment will be described, and a water-permeable cover plate 2 of an inner cylinder water pressure expansion type fiber grating osmometer according to the present embodiment is screwed to an opening at the upper end of a housing 6. Other components and connection relationships are the same as those in the second embodiment.
The fourth concrete implementation mode: the embodiment is described with reference to fig. 1 to 11, and the inner cylinder water pressure expansion type fiber bragg grating osmometer according to the embodiment further includes an O-ring 5, the O-ring 5 is sleeved at an opening at the upper end of the housing 6, and the O-ring 5 is located between the water permeable cover plate 2 and the opening at the upper end of the housing 6.
The O-shaped sealing ring 5 is made of elastic sealing materials. Other components and connection relationships are the same as those in the first or second embodiment.
The fifth concrete implementation mode: the embodiment is described with reference to fig. 1 to 11, and the inner-tube water pressure expansion type fiber bragg grating osmometer further includes an outlet solenoid 7 and an armored optical cable 8, the upper end of the outlet solenoid 7 is inserted into a screw hole in the middle of the bottom surface of the housing 6, and one end of the armored optical cable 8 penetrates through the outlet solenoid 7 and is connected with the fiber bragg grating 3 in the inner container 4. Other components and connections are the same as those in the first embodiment.
Principle of operation
The water permeable material 1 is embedded in the top of the water permeable cover plate 2 and is bonded by high polymer glue; the water permeable cover plate 2 is provided with internal threads and is screwed with the shell 6, and the inside of the water permeable cover plate contains an O-shaped sealing ring 5 which plays a role in sealing; the grating 3 is wound in a pre-groove on the outer wall of the liner 4 at a certain angle and fixed by polymer adhesive, water enters the hollow core of the liner 4 through the water permeable cover plate 2 to cause the liner 4 to expand, and the volume deformation of the liner 4 drives the grating 3 to generate uniform linear change to cause the change of wavelength; an external thread is engraved at the upper end of the shell 6 and used for connecting the water-permeable cover plate 2, a bearing platform is reserved at the top of the shell and used for fixing the inner container 4, an annular groove is engraved at the bottom of the external thread, an O-shaped sealing ring 5 is placed to seal the water-permeable cover plate 2 and the shell 6, a circular cavity is reserved at the bottom of the shell 6 and connected with a wire outlet solenoid 7 for leading out optical fibers; during assembly, firstly, the outgoing line solenoid 7 is connected with the shell 6, the liner 4 wound by the optical fiber 3 is placed in the shell 6, high-molecular glue is coated for sealing and fixing, the optical fiber is led out from the outgoing line solenoid 7, an armored optical cable 8 is used as an outer layer for protection, and a jumper wire head is welded; secondly, the O-shaped sealing ring 5 is placed in an annular groove of the shell 6, and the water-permeable cover plate 2 is connected with the shell 6 through threads.
The water permeable material is embedded in the top of the water permeable cover plate and is bonded by the polymer adhesive; the water permeable cover plate is provided with internal threads and is screwed with the shell, and an O-shaped sealing ring is arranged in the water permeable cover plate to play a role in sealing; the grating is wound in a pre-groove on the outer wall of the liner at a certain angle and fixed by polymer glue, water enters the hollow core of the liner through the water-permeable cover plate to cause the liner to expand, and the volume of the liner deforms to drive the grating to generate uniform linear change to cause the change of wavelength; the upper end of the shell is engraved with external threads for connecting the water permeable cover plate; the top is provided with a bearing platform for fixing the inner container; an annular groove is carved at the bottom of the external thread, and an O-shaped sealing ring is placed to seal the water-permeable cover plate and the shell; a circular cavity is reserved at the bottom of the shell and connected with an outgoing line solenoid for outgoing of optical fibers. During assembly, the outgoing line solenoid is connected with the shell, the inner container wound by the optical fiber is placed in the shell, high polymer glue is coated for sealing and fixing, the optical fiber is led out from the outgoing line solenoid, an armored optical cable is used as outer layer protection, and the armored optical cable is connected with a jumper wire head; and secondly, placing the O-shaped sealing ring into the annular groove of the shell, and connecting the water-permeable cover plate with the shell through threads.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. The utility model provides an inner tube water pressure inflation formula fiber grating osmometer which characterized in that: the utility model provides an inner tube water pressure inflation formula fiber grating osmometer includes fiber grating (3), inner bag (4), casing (6) and infiltration lid subassembly, and inner bag (4) cartridge is in casing (6), and fiber grating (3) winding is on inner bag (4) outer wall, infiltration lid subassembly spiral-lock is at the opening part of casing (6) upper end.
2. The inner barrel water pressure expansion type fiber bragg grating osmometer according to claim 1, characterized in that: the water seepage cover assembly comprises a water seepage material (1) and a water seepage cover plate (2), the water seepage material (1) is embedded in a through hole in the middle of the upper surface of the water seepage cover plate (2), and the water seepage cover plate (2) is buckled at an opening at the upper end of the shell (6).
3. The inner barrel water pressure expansion type fiber bragg grating osmometer according to claim 2, characterized in that: the water seepage cover plate (2) is screwed at the opening at the upper end of the shell (6).
4. The inner barrel water pressure expansion type fiber bragg grating osmometer according to claim 1 or 2, characterized in that: the inner cylinder water pressure expansion type fiber grating osmometer further comprises an O-shaped sealing ring (5), the O-shaped sealing ring (5) is sleeved at an opening at the upper end of the shell (6), and the O-shaped sealing ring (5) is located between the water seepage cover plate (2) and the opening at the upper end of the shell (6).
5. The inner barrel water pressure expansion type fiber bragg grating osmometer according to claim 1, characterized in that: the inner cylinder water pressure expansion type fiber bragg grating osmometer further comprises an outlet solenoid (7) and an armored optical cable (8), the upper end of the outlet solenoid (7) is inserted into a screw hole in the middle of the bottom surface of the shell (6), and one end of the armored optical cable (8) penetrates through the outlet solenoid (7) to be connected with the fiber bragg grating (3) in the inner container (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010554874.7A CN111665182A (en) | 2020-06-17 | 2020-06-17 | Inner tube water pressure expansion type fiber grating osmometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010554874.7A CN111665182A (en) | 2020-06-17 | 2020-06-17 | Inner tube water pressure expansion type fiber grating osmometer |
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| Publication Number | Publication Date |
|---|---|
| CN111665182A true CN111665182A (en) | 2020-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010554874.7A Pending CN111665182A (en) | 2020-06-17 | 2020-06-17 | Inner tube water pressure expansion type fiber grating osmometer |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63234205A (en) * | 1987-03-20 | 1988-09-29 | Fujikura Ltd | Sensor for detecting water infiltration in optical fiber |
| CN2257608Y (en) * | 1995-03-24 | 1997-07-09 | 长江水利委员会长江科学院土工研究所 | Osmometer adjustable sealing locating device |
| CN201016745Y (en) * | 2006-12-21 | 2008-02-06 | 北京品傲光电科技有限公司 | Optical fibre grating osmometer |
| CN201155997Y (en) * | 2008-02-25 | 2008-11-26 | 北京基康科技有限公司 | Optical fiber grating osmometer |
| CN101603873A (en) * | 2009-07-14 | 2009-12-16 | 山东大学 | Pull-rod fiber bragg grating osmometer |
| US8619256B1 (en) * | 2012-09-14 | 2013-12-31 | Halliburton Energy Services, Inc. | Systems and methods for monitoring the properties of a fluid cement composition in a flow path |
| CN105606296A (en) * | 2015-12-30 | 2016-05-25 | 南京南瑞集团公司 | Fiber type osmotic pressure sensor with fine-tuning device and automatic temperature compensation |
-
2020
- 2020-06-17 CN CN202010554874.7A patent/CN111665182A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63234205A (en) * | 1987-03-20 | 1988-09-29 | Fujikura Ltd | Sensor for detecting water infiltration in optical fiber |
| CN2257608Y (en) * | 1995-03-24 | 1997-07-09 | 长江水利委员会长江科学院土工研究所 | Osmometer adjustable sealing locating device |
| CN201016745Y (en) * | 2006-12-21 | 2008-02-06 | 北京品傲光电科技有限公司 | Optical fibre grating osmometer |
| CN201155997Y (en) * | 2008-02-25 | 2008-11-26 | 北京基康科技有限公司 | Optical fiber grating osmometer |
| CN101603873A (en) * | 2009-07-14 | 2009-12-16 | 山东大学 | Pull-rod fiber bragg grating osmometer |
| US8619256B1 (en) * | 2012-09-14 | 2013-12-31 | Halliburton Energy Services, Inc. | Systems and methods for monitoring the properties of a fluid cement composition in a flow path |
| CN105606296A (en) * | 2015-12-30 | 2016-05-25 | 南京南瑞集团公司 | Fiber type osmotic pressure sensor with fine-tuning device and automatic temperature compensation |
Non-Patent Citations (1)
| Title |
|---|
| 谭忆秋等: "沥青路面用光纤光栅温度传感器校准方法研究", 《建筑材料学报》 * |
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Application publication date: 20200915 |