CN114440752B - Wireless monitoring system and method based on graphene displacement sensor - Google Patents
Wireless monitoring system and method based on graphene displacement sensor Download PDFInfo
- Publication number
- CN114440752B CN114440752B CN202210103416.0A CN202210103416A CN114440752B CN 114440752 B CN114440752 B CN 114440752B CN 202210103416 A CN202210103416 A CN 202210103416A CN 114440752 B CN114440752 B CN 114440752B
- Authority
- CN
- China
- Prior art keywords
- graphene
- plate
- displacement
- sliding
- spring
- 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.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a wireless monitoring system and a wireless monitoring method based on a graphene displacement sensor. The system can transfer the displacement of the detected structure to a graphene sensor with high stretching sensitivity, convert a resistance signal generated by the graphene into an electric signal, and finally display data in a user hand through a wireless transmission protocol so as to realize the monitoring of the displacement of the detected structure; the user can carry out patterning customization to the graphene according to actual demands so as to meet different ranges and application scenes.
Description
Technical Field
The invention relates to the field of intelligent sensing, in particular to a wireless monitoring system and method based on a graphene displacement sensor.
Background
In modern engineering, the sensor transmits, processes, stores and controls sensed physical information, and has wide application in the fields of structural health monitoring, robots and the like, and the monitored physical quantities comprise angles, pressures, vibrations, strains, displacements and the like. The displacement sensor has the widest application range and is also a main source of sensing of other sensors.
Currently, the sensing methods of displacement sensors mainly include capacitive type, magnetic induction type, laser type and optical fiber type.
For example, chinese patent document CN104833398A discloses a displacement-temperature simultaneous measurement optical fiber sensor which comprises an interference cavity, a fluorescent material body, a capillary glass tube, an emitting optical fiber, a receiving optical fiber, a fluorescence excitation light source and a light source driving circuit. The sensor solves the problem that the single-parameter optical fiber sensor is fussy to lay, and realizes simultaneous measurement of displacement and temperature. However, the sensor has high manufacturing cost and is limited by the physical properties of the optical fiber, the axial tensile strain which cannot be generated by the optical fiber sensor is very limited, displacement is required to be converted, the unavoidable precision is reduced, and compared with a wireless monitor, the sensor needs manual wiring, so that a lot of labor cost and uncertainty are brought to practical application.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a wireless monitoring system and a wireless monitoring method based on a graphene displacement sensor, so that the problems in the prior art are solved.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a wireless monitoring system based on a variable-stiffness double-spring graphene displacement sensor comprises a measurement sensing module, a data processing module and an upper computer system, wherein the measurement sensing module is connected with the data processing module through a PCB (printed circuit board), and the data processing module performs wireless transmission with the upper computer system.
Preferably, the data processing module comprises a transmission interface, data processing and peripheral and data transmission, and converts the sensor resistance signal change into visual digital signal data; the transmission mode of the upper computer system and the data processing module is the Lora protocol.
Preferably, the measurement sensing module comprises a graphene unit, a double-spring stretching unit and a connecting unit;
the graphene unit comprises a graphene stretching composite material, a conductive sheet and a clamp;
the fixture comprises a left clamping plate and a right clamping plate, each clamping plate comprises an upper clamping plate and a lower clamping plate, two ends of the graphene stretching composite material are clamped and fixed by the corresponding clamping plates, one clamping plate is a PCB, the PCB is divided into the upper clamping plate and the lower clamping plate, the graphene stretching composite material is connected with the lower end of the PCB through the conductive sheet, and the PCB is connected with the transmission interface.
Preferably, the graphene tensile composite material is in a rectangular strip structure.
Preferably, the graphene stretching composite material comprises a graphene sensitive material and a stretchable polymer material, and the projection shape of the graphene sensitive material is spiral.
Preferably, the connecting unit comprises a shell, a sliding rod, an external connecting end, a sliding rail, a first sliding block, a second sliding block, a fixed block, a first sliding plate, a second sliding plate, a fixed plate, a first supporting plate and a second supporting plate;
the sliding rail is fixedly connected to the bottom of the inner cavity of the shell, the first sliding plate is fixed on the first sliding block, and the first sliding block is connected to the sliding rail in a sliding way; the second sliding plate is fixed on the second sliding block, and the second sliding block is connected to the sliding rail in a sliding way; the upper part of the second sliding plate is provided with a first supporting plate; the fixed plate is fixed on the fixed block, and the fixed block is fixed on the sliding rail; the upper part of the fixed plate is provided with a second supporting plate; the graphene unit is connected with the second sliding plate and the fixed plate through the first supporting plate and the second supporting plate respectively.
Preferably, the upper side of the shell is in an open structure and is glued and sealed.
A wireless monitoring method based on a variable-stiffness double-spring graphene displacement sensor adopts the wireless monitoring system, and comprises the following steps:
firstly, designing patterns and dimensions of a measurement sensing module of a variable-stiffness double spring according to the prediction of displacement of a measured structure, completing assembly, and finally installing the measurement sensing module on the surface of the measured structure;
step two, converting the measured resistance signal into an electric signal through a data processing module, and transmitting the electric signal to an upper computer system through a Lora protocol;
thirdly, obtaining a direct relation between the variable-stiffness double-spring graphene displacement sensor and displacement by utilizing the relation between the resistance value of the graphene tensile composite material and the displacement of the tested structure;
step four, obtaining the relation between the resistance value R of the graphene and the stretching length s as R=f(s) through a calibration test;
step five, respectively fixing the external connection end, the shell and the detected structure, and when the detected structure is displaced, driving the first sliding plate to slide in the displacement direction by the sliding rod, wherein the rigidity of the small-rigidity long spring is k 1 At this time, the force acting on the small-stiffness long spring is F 1 ＝k 1 s 1 The high-rigidity short spring generates displacement s through the transmission of the second sliding plate 2 Assuming that the stiffness of the high-stiffness short spring is k 2 The force generated by the force applied to the high-stiffness short spring is F 2 ＝k 2 s 2 The balance is obtained for the whole displacement meter: f (F) 1 ＝F 2 I.e. k 1 s 1 ＝k 2 s 2 Because the graphene stretching composite material and the high-rigidity short spring are simultaneously stretched, s=s 2 The relationship between the displacement generated by the structure to be measured and the resistance value generated by the graphene is:
wherein the method comprises the steps of
As an inverse function of r=f(s), measurement of the displacement of the structure under test can be achieved using this formula;
and step six, converting the resistance signal into a digital signal through a data processing module, and finally transmitting the acquired data to a user platform through an upper computer system, wherein a user can set an alarm threshold value, and an alarm is sent out when the displacement exceeds the set threshold value, so that the displacement of the tested structure is monitored.
Compared with the prior art, the invention has the following beneficial effects:
(1) The graphene is used as a sensing element, so that the graphene has strong stretching performance, the stretching percentage of the graphene can reach 100%, and meanwhile, the graphene has high stretching sensitivity, the shape is variable, the length can be changed according to a measuring range, and the measuring range of the system is enlarged; in addition, be bolted connection between graphite alkene unit and the connecting unit, can realize the arbitrary change of graphite alkene unit, be favorable to technical personnel's installation dismantlement.
(2) The end face of the shell is provided with the guide hole, the sliding rod extends into the shell from the guide hole, and the guide hole prevents the sliding rod from shaking up and down and back and forth in the shell; the sliding rail arranged in the shell is used for restraining displacement, can effectively avoid inclination, instability and the like caused by uneven stress, and improves measurement accuracy.
(3) According to the invention, the round column is pushed into the sliding hole to compress and store force for the ejection spring, meanwhile, the limiting rod is pulled down, the clamping plate is clamped into the annular groove on the outer circle of the round column, when the lower end of the supporting tube is inserted into a firm rock stratum, the lower end of the limiting rod is passively pushed, the clamping plate is separated from the limitation of the round column, the round column is ejected and inserted into a soil layer through the push rod, and in the ejection process, the round column is enabled to rotate by the spiral groove, so that the inserting rod is conveniently inserted into the soil layer to be detected.
Drawings
FIG. 1 is a schematic workflow diagram of the present invention;
FIG. 2 is a schematic perspective view of a measurement sensor module according to the present invention;
fig. 3 is a schematic structural view of a graphene unit of the present invention;
FIG. 4 is a schematic structural view of the dual spring tension unit of the present invention;
FIG. 5 is a schematic view of the structure of the connection unit of the present invention;
FIG. 6 is a schematic shape of a graphene-sensitive material of the present invention;
FIG. 7 is a state diagram of the use of the measurement sensor module of the present invention;
FIG. 8 is an enlarged partial schematic view at E in FIG. 7;
FIG. 9 is an enlarged schematic view of a portion at F in FIG. 8;
fig. 10 is a schematic view of the structure of the plunger of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1-6, as shown in fig. 1, the invention provides a wireless monitoring system based on a variable-stiffness double-spring graphene displacement sensor, which comprises a measurement sensing module 1, a data processing module 2 and an upper computer system 3, wherein the measurement sensing module 1 is connected with the data processing module 2 through a Printed Circuit Board (PCB), and the data processing module 2 and the upper computer system 3 are in wireless transmission in a LORA protocol. When the measuring and sensing module 1 is tightly attached to the surface of a structure to be measured, but the structure to be measured is slightly displaced, the resistance value of the measuring and sensing module 1 is changed, the measured resistance signal is processed through the data processing module 2 and then transmitted to the upper computer system 3, and related personnel can observe the displacement quantity generated by the structure to be measured in real time through the upper computer system 3, so that the measuring and sensing device is more convenient and quicker.
The data processing module 2 comprises a transmission interface, data processing and peripheral and data transmission, and converts the sensor resistance signal change into visual digital signal data; the transmission mode of the upper computer system 3 and the data processing module 2 is the Lora protocol.
As shown in fig. 2-5, the measurement sensing module 1 includes a graphene unit 4, a double spring stretching unit 5, and a connection unit 6;
the graphene unit 4 comprises a graphene tensile composite material 41, a conductive sheet 42 and a clamp; the graphene stretching composite material 41 is of a rectangular strip-shaped structure, the graphene stretching composite material 41 is formed by compounding graphene and a high polymer material, and the graphene grows on the surface of a stretchable high polymer;
the fixture consists of a left clamping plate 43 and a right clamping plate 43, each clamping plate 43 consists of an upper clamping plate and a lower clamping plate, two ends of the graphene stretching composite material 41 are clamped and fixed by the corresponding clamping plates, the clamping plates are connected through screws, one clamping plate is a PCB (printed circuit board) for installing an electric signal receiving port, the PCB is divided into an upper clamping plate and a lower clamping plate, and through holes are formed in two ends of the PCB, so that the fixture has the functions of conducting and clamping; the graphene tensile composite material 41 is connected with the lower end of the PCB through a conductive sheet 42. The PCB board is connected with the transmission interface. Wherein, PCB board connected mode is the screw detachable connection mode, is convenient for measure the change of sensing module 1 and transmission interface.
The double spring tension unit 5 includes a small-rate long spring 51 and a large-rate short spring 52, and the length ratio between the two springs is 2:1, stiffness ratio 1:2. the actual displacement generated by the tested structure is converted into the tiny displacement generated by the graphene unit 4 through the two groups of springs.
The connection unit 6 includes a housing 68, a slide bar 61, an externally coupled end 62, a slide rail 65, a first slider 641, a second slider 642, a fixed block 643, a first slide plate 631, a second slide plate 632, a fixed plate 67, a first support plate 661, and a second support plate 662; the slide bar 61, the external connection end 62 and the slide plate 631 are integrally formed; the slide bar 61 is positioned on the central axis of the shell 68, so that the structure is not easy to generate eccentric phenomenon;
the sliding rail 65 is fixedly connected to the bottom of the inner cavity of the housing 68, the first sliding plate 631 is fixed on the first sliding block 641, and the first sliding block 641 is slidably connected to the sliding rail 65 and can slide left and right; the second sliding plate 632 is fixed on the second sliding block 642, and the second sliding block 642 is slidably connected to the sliding rail 65 and can slide left and right; the upper part of the second sliding plate 632 is provided with a first supporting plate 661, and two sides of the first supporting plate 661 are respectively provided with mounting holes; the fixing plate 67 is fixed on the fixing block 643, and the fixing block 643 is fixed on the sliding rail 65; the upper part of the fixed plate 67 is provided with a second supporting plate 662, and both sides of the second supporting plate 662 are respectively provided with mounting holes; the upper side of the housing 68 is of an open structure and is glued, and the glue used is epoxy glue. The small-stiffness long spring 51 is fixedly connected between the first slide plate 631 and the second slide plate 632 by bolts; the high-rigidity short spring 52 is fixedly connected between the second sliding plates 632 via bolts to the fixing plate 67; the graphene unit 4 is connected to the second sliding plate 632 and the fixing plate 67 through the first and second support plates 661 and 662, respectively; the external connection end 62 is fixed on the measured object, and pushes the slide rod 61, the first slide block 641 and the first slide plate 631 to move, the second slide plate 632 is far away from the fixed plate 67, and the graphene unit 4 generates strain to change resistance.
The end face of the shell 68 is provided with a guide hole, the slide bar 61 extends into the shell 68 from the guide hole, and the guide hole avoids the influence of the vertical and back-and-forth shaking of the slide bar 61 in the shell 68 on the measurement result.
As shown in fig. 6, the graphene stretched composite material 41 includes a graphene-sensitive material 411 and a stretchable polymer material 412; the shape and the size of the graphene sensitive material 411 can be adjusted according to the displacement generated by the structure to be measured, the projection shape of the graphene sensitive material can be spiral, and the rotation number can be one circle, two circles or three circles; the stretchable polymeric material 412 is a polymeric material having electrical conductivity including, but not limited to, polyethylene oxide, polyvinylidene fluoride.
The invention also discloses a wireless monitoring method based on the variable-stiffness double-spring graphene displacement sensor, which comprises the following working steps:
firstly, according to the prediction of displacement quantity generated by a structure to be tested, designing patterns and dimensions of a measurement sensing module 1 of a variable stiffness double spring, completing assembly, and finally installing the measurement sensing module on the surface of the structure to be tested;
step two, the measured resistance signal is converted into an electric signal through a data processing module 2, and the electric signal is transmitted to a user terminal through a Lora protocol;
thirdly, obtaining a direct relation between the variable-stiffness double-spring graphene displacement sensor and displacement by utilizing the relation between the resistance value of the graphene tensile composite material 41 and the displacement of the tested structure;
step four, obtaining the relation between the resistance value R of the graphene and the stretching length s as R=f(s) through a calibration test;
step five, as shown in fig. 2-5, the external connection end 62 and the housing 68 are respectively fixed with the structure to be tested, when the structure to be tested is displaced, the sliding rod 61 drives the first sliding plate 631 to slide in the displacement direction, assuming that the stiffness of the low-stiffness long spring 51 is k 1 At this time, the force acting on the small-stiffness long spring 51 is F 1 ＝k 1 s 1 The high-stiffness short spring 52 generates displacement s by the transmission of the second sliding plate 632 2 Assume that the stiffness of the high-stiffness short spring 52 is k 2 The force generated by the force applied to the short high rate spring 52 is F 2 ＝k 2 s 2 The balance is obtained for the whole displacement meter: f (F) 1 ＝F 2 I.e. k 1 s 1 ＝k 2 s 2 Due to the graphene stretching of the composite material41 simultaneously with the high stiffness short spring 52, s=s 2 The relationship between the displacement generated by the structure to be measured and the resistance value generated by the graphene is:
wherein->
As an inverse function of r=f(s), measurement of the displacement of the structure under test can be achieved using this equation.
Step six, the resistance signal is converted into a digital signal through the data processing module 2, and finally the acquired data is transmitted to the user platform through the upper computer system 3, wherein the upper computer system 3 is developed according to a specific application environment, the development technology belongs to the prior art, details are omitted, a user can set an alarm threshold, and an alarm is given when the displacement exceeds the set threshold, so that the displacement of the tested structure is monitored.
As shown in fig. 7-10, the measurement sensing module 1 is used for monitoring stratum settlement, a pre-drilled hole is drilled in a detected stratum, a supporting tube 7 is inserted into the pre-drilled hole, the lower end of the supporting tube 7 is fixed on a firm stratum, an annular array of the outer wall of the supporting tube 7 is fixedly connected with a plurality of measurement sensing modules 1, an externally connected end 62 of the measurement sensing module 1 is in a circular ring shape, the supporting tube 7 is provided with a sliding hole 71 coaxial with the externally connected end 62, the sliding hole 71 is in sliding connection with a circular column 72 in a sliding manner, one end of the circular column 72 is fixedly connected with a plug rod 73, the supporting tube 7 is axially and slidably connected with a limiting rod 74, the lower end of the limiting rod 74 passes through the lower end of the supporting tube 7, the upper end of the limiting rod 74 is fixedly connected with a clamping plate 75, the clamping plate 75 is provided with a square through hole, an annular groove 721 is formed in the outer circle of the circular column 72, the circular column 72 is penetrated by the square through hole, the clamping plate 75 is clamped into the annular groove 721, a baffle 76 is fixedly connected in the middle of the supporting tube 7, the baffle 76 is fixedly connected with a sleeve 77, the sleeve 78 is fixedly connected with a push rod 78, a push rod 78 is connected with a push rod 78 is in the bottom of the sleeve 77, and a ejection spring 79 is fixedly connected with the bottom of the sleeve 77, and is contacted with one end of the circular column 72;
a spiral groove 711 is arranged in the sliding hole 71, the outer circle of the circular column 72 is rotationally connected with a ball 712, and the ball 712 is slidably connected in the spiral groove 711;
the hole annular array of outer allies oneself with end 62 sets up a plurality of square roll-off grooves, sliding connection one side square shaped plate 621 in every square roll-off groove, circular post 72 one end fixed connection push ring 622, the inner circle of push ring 622 is close to the one end of outer allies oneself with end 62 and sets up the oblique angle, the terminal surface of outer allies oneself with end 62 sets up annular groove 623, annular groove 623 communicates with square roll-off groove, square shaped plate 621 one side fixed connection triangular block 624, push ring 622 makes square shaped plate 621 be released by square roll-off groove through the oblique angle, square roll-off groove one end inner wall sets up the chucking hole, sliding connection chucking post 625 in the chucking hole, be equipped with joint spring 626 between the hole bottom of chucking post 625 and chucking hole, square shaped plate 621 one side sets up butt joint hole 627, chucking post 625 can stretch into in the butt joint hole 627.
The working principle of the stratum settlement monitoring is as follows: pushing the circular column 72 into the sliding hole 71, compressing and accumulating the ejection spring 79, simultaneously pulling down the limiting rod 74, clamping the clamping plate 75 into the annular groove 721 of the outer circle of the circular column 72, when the lower end of the supporting tube 7 is inserted into a firm rock stratum, the lower end of the limiting rod 74 is passively pushed, the clamping plate 75 breaks away from the limitation of the circular column 72, the circular column 72 is ejected and inserted into a soil layer through the push rod 78, and in the ejection process, the circular column 72 is enabled to rotate by the spiral groove 711, so that the inserting rod 73 is conveniently inserted into the soil layer to be detected.
Further, in order to make the inserted link 73 conveniently pass the round hole of the outer link end 62, a gap exists between the inserted link 73 and the outer link end 62, influence exists on settlement monitoring, the square plate 621 is pushed out by the square slide-out groove by pushing the triangular block 624 through the oblique angle of the push ring 622, the inserted link 73 is limited, the inserted link 73 is enabled to be in a surrounding state after being stably inserted into a soil layer, and is locked by the clamping column 625, so that the inserted link 73 and the outer link end 62 are firmly connected and synchronously settle, and monitoring quality is guaranteed while installation is facilitated.
Various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A wireless monitoring system based on become dual spring graphite alkene displacement sensor of rigidity, its characterized in that: the system comprises a measurement sensing module (1), a data processing module (2) and an upper computer system (3), wherein the measurement sensing module (1) is connected with the data processing module (2) through a PCB (printed circuit board), and the data processing module (2) and the upper computer system (3) are in wireless transmission;
the measuring and sensing module (1) comprises a graphene unit (4), a double-spring stretching unit (5) and a connecting unit (6);
the graphene unit (4) comprises a graphene tensile composite material (41), a conductive sheet (42) and a clamp;
the fixture consists of a left clamping plate and a right clamping plate (43), each clamping plate (43) consists of an upper clamping plate and a lower clamping plate, two ends of the graphene stretching composite material (41) are clamped and fixed by the corresponding clamping plates, one clamping plate is a PCB (printed circuit board) which is divided into an upper clamping plate and a lower clamping plate, the graphene stretching composite material (41) is connected with the lower end of the PCB through a conductive plate (42), and the PCB is connected with a transmission interface;
the connecting unit (6) comprises a shell (68), a slide bar (61), an external connection end (62), a slide rail (65), a first sliding block (641), a second sliding block (642), a fixed block (643), a first sliding plate (631), a second sliding plate (632), a fixed plate (67), a first supporting plate (661) and a second supporting plate (662);
the sliding rail (65) is fixedly connected to the bottom of the inner cavity of the shell (68), the first sliding plate (631) is fixed on the first sliding block (641), and the first sliding block (641) is connected to the sliding rail (65) in a sliding manner; the second sliding plate (632) is fixed on a second sliding block (642), and the second sliding block (642) is connected on the sliding rail (65) in a sliding way; the upper part of the second sliding plate (632) is provided with a first supporting plate (661); the fixing plate (67) is fixed on the fixing block (643), and the fixing block (643) is fixed on the sliding rail (65); a second supporting plate (662) is arranged at the upper part of the fixed plate (67); the graphene unit (4) is connected with the second sliding plate (632) and the fixed plate (67) through the first supporting plate (661) and the second supporting plate (662) respectively.
2. The wireless monitoring system based on the variable-stiffness double-spring graphene displacement sensor according to claim 1, wherein the wireless monitoring system is characterized in that: the data processing module (2) comprises a transmission interface, data processing, peripheral and data transmission, and converts the change of the sensor resistance signal into visual digital signal data; the transmission mode of the upper computer system (3) and the data processing module (2) is the Lora protocol.
3. The wireless monitoring system based on the variable-stiffness double-spring graphene displacement sensor according to claim 1, wherein the wireless monitoring system is characterized in that: the graphene stretching composite material (41) is of a rectangular strip-shaped structure.
4. The wireless monitoring system based on the variable-stiffness double-spring graphene displacement sensor according to claim 1, wherein the wireless monitoring system is characterized in that: the graphene stretching composite material (41) comprises a graphene sensitive material (411) and a stretchable polymer material (412), and the projection shape of the graphene sensitive material (411) is spiral.
5. The wireless monitoring system based on the variable-stiffness double-spring graphene displacement sensor according to claim 1, wherein the wireless monitoring system is characterized in that: the upper side of the shell (68) is of an open structure and is glued and sealed.
6. A wireless monitoring method based on a variable-stiffness double-spring graphene displacement sensor is characterized by comprising the following steps of: the wireless monitoring system of claim 5, comprising the steps of:
firstly, according to the prediction of displacement quantity of a structure to be measured, designing patterns and dimensions of a measurement sensing module (1) of a variable stiffness double spring, completing assembly, and finally installing the measurement sensing module on the surface of the structure to be measured;
step two, the measured resistance signal is converted into an electric signal through a data processing module (2), and the electric signal is transmitted to an upper computer system (3) through a Lora protocol;
thirdly, obtaining a direct relation between the variable-stiffness double-spring graphene displacement sensor and displacement by utilizing the relation between the resistance value of the graphene tensile composite material (41) and the displacement of the tested structure;
step four, obtaining the relation between the resistance value R of the graphene and the stretching length s as R=f(s) through a calibration test;
step five, the outer connecting end head (62) and the shell (68) are respectively fixed with the detected structure, when the detected structure is displaced, the sliding rod (61) drives the first sliding plate (631) to slide along the displacement direction, and the rigidity of the small-rigidity long spring (51) is k 1 At this time, the force acting on the small-stiffness long spring (51) is F 1 ＝k 1 s 1 Then the large-rigidity short spring (52) generates displacement s by the transmission of the second sliding plate (632) 2 Assume that the stiffness of the high-stiffness short spring (52) is k 2 The force generated by the force applied to the high-stiffness short spring (52) is F 2 ＝k 2 s 2 The balance is obtained for the whole displacement meter: f (F) 1 ＝F 2 I.e. k 1 s 1 ＝k 2 s 2 Since the graphene tensile composite material (41) and the high-rigidity short spring (52) are simultaneously stretched, s=s 2 The relationship between the displacement generated by the structure to be measured and the resistance value generated by the graphene is:
wherein->
As an inverse function of r=f(s), measurement of the displacement of the structure under test can be achieved using this formula;
step six, converting the resistance signal into a digital signal through a data processing module (2), and finally transmitting the acquired data to a user platform through an upper computer system (3), wherein a user can set an alarm threshold value, and an alarm is given when the displacement exceeds the set threshold value, so that the displacement of the tested structure is monitored.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210103416.0A CN114440752B (en) | 2022-01-27 | 2022-01-27 | Wireless monitoring system and method based on graphene displacement sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210103416.0A CN114440752B (en) | 2022-01-27 | 2022-01-27 | Wireless monitoring system and method based on graphene displacement sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114440752A CN114440752A (en) | 2022-05-06 |
| CN114440752B true CN114440752B (en) | 2023-06-20 |
Family
ID=81370069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210103416.0A Active CN114440752B (en) | 2022-01-27 | 2022-01-27 | Wireless monitoring system and method based on graphene displacement sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114440752B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102506693A (en) * | 2011-11-04 | 2012-06-20 | 南京航空航天大学 | Graphene-based strain measuring and motion sensing device and manufacturing method thereof |
| JP2012247189A (en) * | 2011-05-25 | 2012-12-13 | Hitachi Ltd | Graphene sensor, substance species analyzer using sensor, and method for detecting substance species using sensor |
| CN106289035A (en) * | 2016-08-03 | 2017-01-04 | 中国矿业大学 | A kind of high temperature difference resistive Graphene displacement, pressure integrated sensor |
| CN109029230A (en) * | 2018-06-21 | 2018-12-18 | 清华大学 | Tangent displacement sensor measuring device and measuring circuit |
| EP3683537A1 (en) * | 2019-01-18 | 2020-07-22 | Fundació Institut Català de Nanociència i Nanotecnologia | Displacement sensor |
| CN111998986A (en) * | 2020-09-24 | 2020-11-27 | 铁科院(深圳)研究设计院有限公司 | Stratum pressure sensor based on graphene |
| CN214632152U (en) * | 2020-11-18 | 2021-11-09 | 清华大学 | Flexible gait pressure monitoring system of graphite alkene based on laser is directly write |
| CN113932944A (en) * | 2021-10-12 | 2022-01-14 | 深圳大学 | System and method for monitoring displacement, strain and temperature in soil |
-
2022
- 2022-01-27 CN CN202210103416.0A patent/CN114440752B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012247189A (en) * | 2011-05-25 | 2012-12-13 | Hitachi Ltd | Graphene sensor, substance species analyzer using sensor, and method for detecting substance species using sensor |
| CN102506693A (en) * | 2011-11-04 | 2012-06-20 | 南京航空航天大学 | Graphene-based strain measuring and motion sensing device and manufacturing method thereof |
| CN106289035A (en) * | 2016-08-03 | 2017-01-04 | 中国矿业大学 | A kind of high temperature difference resistive Graphene displacement, pressure integrated sensor |
| CN109029230A (en) * | 2018-06-21 | 2018-12-18 | 清华大学 | Tangent displacement sensor measuring device and measuring circuit |
| EP3683537A1 (en) * | 2019-01-18 | 2020-07-22 | Fundació Institut Català de Nanociència i Nanotecnologia | Displacement sensor |
| CN111998986A (en) * | 2020-09-24 | 2020-11-27 | 铁科院(深圳)研究设计院有限公司 | Stratum pressure sensor based on graphene |
| CN214632152U (en) * | 2020-11-18 | 2021-11-09 | 清华大学 | Flexible gait pressure monitoring system of graphite alkene based on laser is directly write |
| CN113932944A (en) * | 2021-10-12 | 2022-01-14 | 深圳大学 | System and method for monitoring displacement, strain and temperature in soil |
Non-Patent Citations (1)
| Title |
|---|
| 柔性石墨烯传感带拉伸传感性能;刘咏梅等;东华大学学报(自然科学版);第46卷(第01期);第35-40页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114440752A (en) | 2022-05-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE69823026T2 (en) | INTEGRATED RESONANT MICROSTRUCTURE SENSOR FOR HIGH TEMPERATURES | |
| CN107860504B (en) | Accurate dynamic thrust of appearance accuse engine measures calibration integrated device | |
| CN107036804B (en) | Device for detecting spring stiffness coefficients in batches | |
| CN104913905A (en) | Optical fiber bending loss determination method | |
| CN203758495U (en) | Clamping device suitable for rock deformation testing sensor calibration | |
| CN114440752B (en) | Wireless monitoring system and method based on graphene displacement sensor | |
| CN112881169A (en) | Wire tensile property and conductivity test instrument | |
| CN111504217A (en) | Tree radial growth deformation measurement and real-time monitoring device and working method thereof | |
| CN114593665B (en) | Indoor complete machine calibration device of vertical drilling strain gauge | |
| CN213838606U (en) | Drilling hole diameter measuring device | |
| CN114993162A (en) | Device and method for measuring circumferential strain and axial stress of grouting material | |
| CN210604315U (en) | System for testing working performance of wall insulation board | |
| CN220772725U (en) | Rock triaxial test machine | |
| CN207798311U (en) | Cable pulling force test device | |
| CN206724905U (en) | 2 quintic element measuring instruments of network connector | |
| CN104753592A (en) | Light intensity fluctuation monitoring equipment and method | |
| CN216348462U (en) | Calibration device for telescopic instrument | |
| CN216133213U (en) | Testing device | |
| CN219223980U (en) | Optical fiber sensor and optical fiber sensing system | |
| CN205453699U (en) | Equipment of monitoring luminous intensity fluctuation | |
| CN205981504U (en) | Split type two -dimentional force transducer | |
| CN212721886U (en) | Piezoresistive pressure sensor for fire-fighting pressure switch | |
| CN2575688Y (en) | Optical digital combined zoom lens control device for ultramicroscope | |
| CN216694811U (en) | Lever-type roundness measuring instrument sensor | |
| CN217403681U (en) | Jacketed corrugated pipe connector based on communication transmission equipment |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |