CN111998986A - Stratum pressure sensor based on graphene - Google Patents
Stratum pressure sensor based on graphene Download PDFInfo
- Publication number
- CN111998986A CN111998986A CN202011018682.0A CN202011018682A CN111998986A CN 111998986 A CN111998986 A CN 111998986A CN 202011018682 A CN202011018682 A CN 202011018682A CN 111998986 A CN111998986 A CN 111998986A
- Authority
- CN
- China
- Prior art keywords
- shell
- graphene
- elastic membrane
- pressure sensor
- fixing rod
- 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.)
- Pending
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 45
- 239000012528 membrane Substances 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 27
- 239000002689 soil Substances 0.000 claims abstract description 22
- 230000005540 biological transmission Effects 0.000 claims abstract description 19
- 239000011148 porous material Substances 0.000 claims abstract description 18
- 230000008054 signal transmission Effects 0.000 claims abstract description 5
- 239000010419 fine particle Substances 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims description 5
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 239000004020 conductor Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 239000010409 thin film Substances 0.000 abstract 1
- 238000009530 blood pressure measurement Methods 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- -1 graphite alkene Chemical class 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 238000004441 surface measurement Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/02—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning
- G01L9/04—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning of resistance-strain gauges
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention relates to a graphene-based formation pressure sensor, which comprises: the device comprises a shell, wherein two force measuring structures are symmetrically arranged in the shell, one force measuring structure is arranged on the inner top surface of the shell, the other force measuring structure is arranged on the inner bottom surface of the shell, the force measuring structures comprise deformation transmission rods connected to the inner top surface or the inner bottom surface of the shell, elastic membranes horizontally arranged between the inner walls of the shell, the elastic membranes are in contact with the end parts of the deformation transmission rods, graphene thin films are arranged on the surfaces, departing from the end parts of the deformation transmission rods, of the elastic membranes, and electrodes are arranged on the surfaces, departing from the elastic membranes; the two ends of the elastic membrane are provided with electric signal transmission structures which are connected with the electrodes through wires, and the elastic membrane also comprises a groove which is arranged at the bottom of the shell; and the soil retaining and water permeable structure is arranged in the groove and used for preventing fine particles of the stratum soil body from entering the groove to extrude the bottom of the shell. The device can adjust the measuring range and the resolution ratio of the sensor, can simultaneously detect the total pressure of soil and water and the pressure of pore water, and is worthy of popularization.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to a formation pressure sensor based on graphene.
Background
The pressure sensor is a sensor commonly used in industrial practice, is widely applied to various industrial automatic control environments, and relates to a plurality of industries such as water conservancy and hydropower, railway traffic, intelligent buildings, production automatic control, aerospace, military industry, petrochemical industry, oil wells, electric power, ships, machine tools, pipelines and the like. In the fields of geotechnical and underground engineering, stratum pressure is an important parameter for design, construction, operation and maintenance, wherein the most important parameter is total soil-water pressure and pore water pressure of the stratum, and the two are measured simultaneously, so that the effective stress of a stratum soil framework can be obtained, and key information such as soil consolidation state, strength level and the like can be further judged.
In the prior art, although the pressure can be measured, no pressure sensor can simultaneously measure the total soil-water pressure and the pore water pressure of the stratum.
Disclosure of Invention
The invention aims to provide a formation pressure sensor based on graphene, which is characterized in that the conventional sensor cannot flexibly adjust the measuring range and the minimum resolution of the sensor, and cannot simultaneously measure the total soil-water pressure and the pore water pressure of a formation.
The technical scheme of the invention is as follows: a graphene-based formation pressure sensor, comprising:
a housing;
two dynamometry structures, the central symmetry along the casing sets up at the interior top surface and the interior bottom surface of casing, include:
one end of the deformation transmission rod is correspondingly connected to the inner top surface or the inner bottom surface of the shell;
the elastic membrane is horizontally arranged between the inner walls of the shell, and one surface of the elastic membrane is contacted with the end part of the deformation transmission rod departing from the inner top surface or the inner bottom surface;
the graphene film is arranged on one surface of the elastic film, which is far away from the end part of the deformation transmission rod;
the electrode is arranged on one surface of the graphene film, which is far away from the elastic film;
the electric signal transmission structure is made of conductive materials, is connected between two opposite ends of the elastic membrane and the inner wall of the shell and is connected with the electrodes through leads;
the groove is formed in the bottom of the shell;
and the soil retaining and water permeable structure is arranged in the groove and used for preventing fine particles of the stratum soil from entering the groove under the stratum pressure to extrude the bottom of the shell.
Preferably, the signal of telecommunication transmission structure includes the dead lever, and dead lever one end is connected on the inner wall of casing, and the other end and the elastic membrane of dead lever are connected, and the lateral wall that the casing was worn out to one of them dead lever one end that deviates from the elastic membrane extends outside the casing, and is provided with on the extension of dead lever and adjusts the structure, adjusts the rate of elongation that the structure is used for adjusting elastic membrane and graphite alkene film.
Preferably, the adjusting structure comprises a section of thread arranged on a fixing rod penetrating out of the shell and a nut sleeved on the fixing rod.
Preferably, the elastic membrane, the fixing rod and the graphene film are bonded through epoxy resin, and the graphene film and the electrode are also bonded through epoxy resin.
Preferably, the nut is provided with a scale.
Preferably, the soil retaining and water permeating structure comprises a plate body fixed in the groove, and a plurality of pore channels used for allowing formation pore water to pass through and preventing formation soil body particles from passing through are formed in the plate body.
The invention has the beneficial effects that:
1. the formation pressure sensor based on the graphene can be used in a large scale.
2. According to the formation pressure sensor based on graphene, the measurement range and the resolution of the device can be changed by adjusting the structure.
3. According to the graphene-based formation pressure sensor, surface deformation caused by the total soil-water pressure and the pore water pressure of the formation is transmitted to the graphene film through the deformation transmission rod, the total soil-water pressure and the pore water pressure in the formation can be measured simultaneously through the electrode on the graphene film, and the graphene-based formation pressure sensor can also be used for pressure measurement in the application scene of a conventional pressure sensor, and is worthy of popularization.
Drawings
FIG. 1 is a cross-sectional view of the overall structure of the present invention;
fig. 2 is a perspective view of the overall structure of the present invention.
Detailed Description
An embodiment of the present invention will be described in detail with reference to fig. 1 to 2, but it should be understood that the scope of the present invention is not limited by the embodiment.
Example 1
An embodiment of the present invention provides a graphene-based formation pressure sensor, as shown in fig. 1, including: the device comprises a shell 1, wherein two force measuring structures are symmetrically arranged in the shell 1 along the center of the shell 1, one force measuring structure is arranged on the inner top surface of the shell 1, and the other force measuring structure is arranged on the inner bottom surface of the shell 1.
Wherein, dynamometry structure includes: one end of the elastic membrane 7 is correspondingly connected with a deformation transmission rod 8 on the inner top surface or the inner bottom surface of the shell 1, the elastic membrane 7 is horizontally arranged between the inner walls of the shell 1, one surface of the elastic membrane 7 is contacted with the end part, deviating from the inner top surface or the inner bottom surface, of the deformation transmission rod 8, one surface, deviating from the end part of the deformation transmission rod 8, of the elastic membrane 7 is provided with a graphene film 6, and one surface, deviating from the elastic membrane 7, of the graphene film 6 is provided with an electrode 5; the relative both ends of elastic membrane 7 are provided with signal of telecommunication transmission structure, and signal of telecommunication transmission structure connects between elastic membrane 7 tip and 1 inner wall of casing, and conducting material is chooseed for use to signal of telecommunication transmission structure, and signal of telecommunication transmission structure's one end is passed through the wire and is connected with electrode 5, and signal of telecommunication transmission structure's the other end and reading equipment are connected and are formed the return circuit.
The groove is formed in the bottom of the shell 1; and the soil retaining and water permeable structure 4 is arranged in the groove and used for preventing fine particles of the stratum soil from entering the groove under the stratum pressure to extrude the bottom of the shell 1.
Example 2
On the basis of embodiment 1, as shown in fig. 2, the electric signal transmission structure includes a fixing rod 2, one end of the fixing rod 2 is connected to the inner wall of the housing 1, the other end of the fixing rod 2 is connected to the elastic membrane 7, one end of one of the fixing rods 2, which is away from the elastic membrane 7, penetrates through the side wall of the housing 1 and extends out of the housing 1, in order to determine the relationship between the pressure applied to the pressure sensor and the sensing data under different stretching ratios and adjust the measurement range and resolution of the device, an adjusting structure is arranged on the extending section of the fixing rod 2, and the adjusting structure is used for adjusting the stretching ratios of the elastic membrane 7 and the graphene film 6.
Wherein, adjust the structure including wear to establish one section screw thread and the suit nut 3 on dead lever 2 that sets up on the dead lever 2 of casing 1.
Wherein, in order to guarantee to connect stably between elastic membrane 7 and dead lever 2, the graphite alkene film 6, elastic membrane 7 and dead lever 2, graphite alkene film 6 all bond through epoxy, and graphite alkene film 6 also bonds through epoxy with electrode 5.
In order to accurately adjust the stretch ratios of the elastic film 7 and the graphene film 6, scales are provided on the nut 3.
Furthermore, in order to pass and prevent the formation soil body particles from influencing the measurement of the formation pore water pressure, the soil-retaining water-permeable structure 4 comprises a plate body fixed in the groove, and a plurality of pore channels used for the formation pore water to pass through and preventing the formation soil body particles from passing through are formed in the plate body.
The hole is communicated with the stratum measured outside the groove and the pressure measuring area in the groove, the size of the hole is smaller than the size of soil body particles of the measured stratum, and stratum pore water is ensured to pass through and enter the pressure measuring area in the groove without entering the soil body, so that the soil pressure of the stratum is isolated, and the stratum pore water pressure is measured by the pressure measuring area in the groove.
Principle of operation
When the device is used, the top surface and the bottom surface of the sensor are subjected to inward bending deformation under the action of outside pressure, and the deformation is transmitted to the elastic membrane through the deformation transmission rod, so that the graphene film 6 is finally subjected to bending deformation. The electrical characteristics such as resistivity and the like are changed due to the deformation of the graphene film 6, and under the electrified condition, the pressure measurement of the pressure sensor is realized by measuring the electrical characteristic parameters of the graphene film under different outside pressures.
Firstly, one end of a wire is connected with two fixed rods 2, the other end of the wire is connected with reading equipment, the reading of sensors at two ends of an instrument is carried out, the wire of the fixed rod 2 connected with the same graphene film 6 can take a group of data, the movable rod 4 is moved by rotating the dial scale, so that the stretching rates of the elastic film 7 and the graphene film 6 are adjusted, the electrical parameters of the bending deformation micro-strain resistivity change values of the graphene films with different stretching rates are different, the corresponding pressure measurement range and the resolution are different, the adjustment of the range and the minimum resolution of the sensor is realized, the relation between the pressure of the pressure sensor under different stretching rates of the graphene film 6 and the sensing data is obtained through a calibration test, and the calibration work is completed.
Under different stretching ratios of the graphene film 6, the relation P ═ f (X) between the loaded pressure P and the collected data (X) is obtained through experiments, the pressure P1 is loaded on the sensor, the reading received by the voltage amplification measuring equipment in the line is X1, the reading is substituted into P ═ f (X), the specific pressure value P1 ═ f (X1) is obtained, and the pressure is obtained, namely the pressure is measured.
During specific work, the range and the minimum resolution of the sensor are determined according to the stratum water and soil total pressure value and the pore water pressure value pre-estimation range of an application scene, the dial is rotated to correspond, the reading lead is connected, the device is placed in a measured stratum, the pressure obtained by top surface measurement is the stratum water and soil total pressure, and the pressure obtained by bottom surface measurement (with the soil-blocking water-permeable structure 3 side) is the pore water pressure.
In summary, according to the formation pressure sensor based on graphene provided by the embodiment of the invention, the measurement range and resolution of the device can be changed by adjusting the structure; the total soil-water pressure and the pore water pressure in the stratum can be measured simultaneously through the electrodes on the graphene film, and the graphene film can also be used for pressure measurement of a conventional pressure sensor application scene, so that the graphene film is worthy of popularization.
The above disclosure is only for a few specific embodiments of the present invention, however, the present invention is not limited to the above embodiments, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.
Claims (6)
1. A graphene-based formation pressure sensor, comprising:
a housing (1);
two dynamometry structures, the central symmetry along casing (1) sets up at the interior top surface and the interior bottom surface of casing (1), include:
one end of the deformation transmission rod (8) is correspondingly connected to the inner top surface or the inner bottom surface of the shell (1);
the elastic membrane (7) is horizontally arranged between the inner walls of the shell (1), and one surface of the elastic membrane is contacted with the end part of the deformation transmission rod (8) departing from the inner top surface or the inner bottom surface;
the graphene film (6) is arranged on one surface of the elastic film (7) departing from the end part of the deformation transfer rod (8);
the electrode (5) is arranged on one surface, away from the elastic membrane (7), of the graphene film (6);
the electric signal transmission structure is made of conductive materials, is connected between two opposite ends of the elastic membrane (7) and the inner wall of the shell (1), and is connected with the electrode (5) through a lead;
the groove is formed in the bottom of the shell (1);
and the soil retaining and water permeable structure (4) is arranged in the groove and used for preventing fine particles of the stratum soil from entering the groove to extrude the bottom of the shell (1) under the stratum pressure.
2. The graphene-based formation pressure sensor according to claim 1, wherein the electric signal transmission structure comprises a fixing rod (2), one end of the fixing rod (2) is connected to the inner wall of the casing (1), the other end of the fixing rod (2) is connected to the elastic membrane (7), one end of one fixing rod (2) away from the elastic membrane (7) penetrates through the side wall of the casing (1) and extends out of the casing (1), and an adjusting structure is arranged on the extending section of the fixing rod (2) and used for adjusting the stretching rate of the elastic membrane (7) and the graphene film (6).
3. The graphene-based formation pressure sensor according to claim 2, wherein the adjusting structure comprises a section of thread arranged on a fixing rod (2) penetrating the housing (1) and a nut (3) sleeved on the fixing rod (2).
4. A graphene-based formation pressure sensor according to claim 3, wherein the elastic membrane (7) and the fixing rod (2) and the graphene film (6) are bonded by epoxy resin, and the graphene film (6) and the electrode (5) are bonded by epoxy resin.
5. A graphene-based formation pressure sensor according to claim 3, wherein the nut (3) is provided with a scale.
6. The graphene-based formation pressure sensor according to claim 1, wherein the soil and water retaining structure (4) comprises a plate body fixed in the groove, and the plate body is provided with a plurality of pore channels for formation pore water to pass through and preventing formation soil particles from passing through.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011018682.0A CN111998986A (en) | 2020-09-24 | 2020-09-24 | Stratum pressure sensor based on graphene |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011018682.0A CN111998986A (en) | 2020-09-24 | 2020-09-24 | Stratum pressure sensor based on graphene |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111998986A true CN111998986A (en) | 2020-11-27 |
Family
ID=73474901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011018682.0A Pending CN111998986A (en) | 2020-09-24 | 2020-09-24 | Stratum pressure sensor based on graphene |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111998986A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114440752A (en) * | 2022-01-27 | 2022-05-06 | 深圳大学 | Wireless monitoring system and method based on variable-stiffness double-spring graphene displacement sensor |
| CN114563036A (en) * | 2022-01-27 | 2022-05-31 | 深圳大学 | 3D prints graphite alkene sensor application system of geotechnical engineering multi-parameter monitoring |
-
2020
- 2020-09-24 CN CN202011018682.0A patent/CN111998986A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114440752A (en) * | 2022-01-27 | 2022-05-06 | 深圳大学 | Wireless monitoring system and method based on variable-stiffness double-spring graphene displacement sensor |
| CN114563036A (en) * | 2022-01-27 | 2022-05-31 | 深圳大学 | 3D prints graphite alkene sensor application system of geotechnical engineering multi-parameter monitoring |
| CN114440752B (en) * | 2022-01-27 | 2023-06-20 | 深圳大学 | Wireless monitoring system and method based on graphene displacement sensor |
| CN114563036B (en) * | 2022-01-27 | 2023-12-05 | 深圳大学 | Graphene sensor application system for 3D printing geotechnical engineering multi-parameter monitoring |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7401522B2 (en) | Pressure sensor using compressible sensor body | |
| CN111998986A (en) | Stratum pressure sensor based on graphene | |
| DE69523649T2 (en) | Interchangeable vortex sensor sensitive to several measurement parameters | |
| DE10392622T5 (en) | Barometric pressure sensor | |
| AT511330B1 (en) | SENSOR FOR MEASUREMENT OF PRESSURE AND / OR FORCE | |
| DE4124662A1 (en) | RELATIVE PRESSURE SENSOR | |
| CN212320980U (en) | Stratum pressure sensor based on graphene | |
| CN108330941B (en) | Pressure compensation type sounding probe and ocean static sounding equipment | |
| CN108225627A (en) | Engineering machinery diaphragm pressure transducers and manufacturing method | |
| CN108613623A (en) | Electrostatic self energizing strain transducer | |
| CN102305587A (en) | Surface deformation distribution test sensing element | |
| US3411361A (en) | Sealed beam sensors | |
| DE102018105867A1 (en) | Differential pressure sensor for determining a differential pressure magnitude | |
| CN104089571B (en) | Remote calibration device of borehole deformation instrument for borehole ground deformation measurement | |
| CN110542510A (en) | Fiber grating pore water pressure sensor | |
| CN108519173A (en) | A kind of flexibility stress and humidity sensor, preparation method and application | |
| CN104697710A (en) | Pressure sensor calibrating device using granular solid as medium | |
| CN202024932U (en) | Strain gage integration device used under triaxial fluid confining pressure function | |
| CN112067177A (en) | Piezoresistive pressure sensor and piezoresistive pressure sensing array | |
| CN219348004U (en) | Sensor with temperature and pressure dual current output | |
| CN102175139B (en) | Strain gauge integration device under triaxial fluid ambient pressure | |
| CN110607789B (en) | Statics parameter touch probe | |
| CN111413730B (en) | Crust drilling volume type strain gauge | |
| DE4132391C1 (en) | Pressure difference measurement transducer - has two electrically conducting diaphragms separated by insulating plate and has strain gauge connected to evaluation circuitry | |
| CN107870020B (en) | Three coaxial cable capacitance type water level measuring device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |