CN108318537B - Multi-electrode sensing structure and method thereof - Google Patents
Multi-electrode sensing structure and method thereof Download PDFInfo
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- CN108318537B CN108318537B CN201810132645.9A CN201810132645A CN108318537B CN 108318537 B CN108318537 B CN 108318537B CN 201810132645 A CN201810132645 A CN 201810132645A CN 108318537 B CN108318537 B CN 108318537B
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- 238000000034 method Methods 0.000 title abstract description 11
- 239000000853 adhesive Substances 0.000 claims abstract description 23
- 230000001070 adhesive effect Effects 0.000 claims abstract description 23
- 239000003292 glue Substances 0.000 claims abstract description 11
- 238000000691 measurement method Methods 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000004918 carbon fiber reinforced polymer Substances 0.000 claims 9
- 239000003733 fiber-reinforced composite Substances 0.000 description 54
- 239000002131 composite material Substances 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 6
- 229920000049 Carbon (fiber) Polymers 0.000 description 4
- 239000004917 carbon fiber Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 210000002435 tendon Anatomy 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
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Abstract
The invention provides a multi-electrode sensing structure and a method thereof, wherein the multi-electrode sensing structure comprises FRP ribs, anchor cylinders, conductive adhesive and insulating adhesive; two electric sources are arranged on the end surfaces of two ends of the FRP rib; dividing the FRP into N sections for disconnection, and setting N-1 independent voltage poles; the independent voltage poles of the sections are respectively provided with an anchor cylinder, the anchor cylinders connect the adjacent disconnected sections, and insulating glue is injected into the anchor cylinders; the power source is connected with the current input system, and the independent voltage pole of the section is connected with the voltage output system. When the FRP rib receives axial force, the FRP rib axially deforms, the resistance of the FRP rib changes, and the output voltage changes; and calculating a resistance change value through the current and voltage change values, converting the resistance change value into the section stress of the FRP rib, and judging the stress level of the FRP rib. The invention can form a four-electrode circuit for eliminating contact resistance while ensuring the self bearing capacity of the FRP rib, and can accurately monitor the stress state of the FRP rib in real time. The system has the advantages of simple structure, clear principle and convenient implementation.
Description
Technical Field
The invention belongs to the field of sensor research, and particularly relates to a multi-electrode sensing structure and a multi-electrode sensing method. The structure is a multi-electrode sensor structure for indicating the existence and change of resistance, in particular to a sensor which can accurately identify the resistance change of a fiber conductive composite material so as to monitor the stress condition of the material and can be widely used for monitoring the structure.
Background
At present, for materials with low conductivity, a direct current two-terminal electrode method is generally used for resistance test, and although contact resistance between an electrode and a conductive composite material exists, the influence is small. However, for conductive composites with medium and high conductivities, the electrode contact resistance in the two-terminal electrode method has a significant impact on its conductivity test values.
In order to eliminate the influence of the contact resistance of the two-end electrode method on the measurement result, the monitoring circuit can be designed into a mode that the voltage electrode and the current electrode are not overlapped, and the most common is a four-electrode circuit. In fiber reinforced composite FRP ribs, carbon fiber reinforced CFRP ribs are well known high-conductivity materials, and a large error exists in resistance testing by using a two-electrode method, but if the fiber reinforced composite FRP ribs are designed to be four electrodes, more sections are needed to be arranged to be voltage poles. For a member using continuous fibers, how to provide four electrodes without impairing the bearing capacity has not been solved effectively.
Disclosure of Invention
The present invention aims to provide a multi-electrode sensing structure and a method thereof. In a member using fiber reinforced composite (FRP) bars, particularly CFRP bars, in order to overcome the defect that the FRP bars have middle sections, the invention provides a multipurpose multi-electrode sensing structure which can bear higher load and realize self-monitoring.
The technical scheme of the invention is as follows: a multi-electrode sensing structure comprises FRP ribs, an anchor cylinder, conductive adhesive and insulating adhesive;
the end surfaces of the two ends of the FRP rib are coated with conductive adhesive, and electrode plates are respectively arranged to form two electric source electrodes; dividing the FRP into N sections for disconnection, coating conductive adhesive on the sections of the disconnected sections, and respectively arranging electrode plates to form N-1 independent voltage poles; the independent voltage poles of the sections are respectively provided with an anchor cylinder, the anchor cylinders connect the adjacent disconnected sections, and insulating glue is injected into the anchor cylinders;
the power supply pole is connected with the current input system through a wire, and the independent voltage pole of the section is connected with the voltage output system through a wire.
In the scheme, the current input system comprises an ammeter and a constant current power supply;
the power electrode is connected with the ammeter and the constant current power supply through lead wires.
In the above scheme, the voltage output system comprises a voltmeter;
the independent voltage pole is connected with the voltmeter through a wire.
In the scheme, the two ends of the anchor cylinder are respectively provided with the end plugs.
In the scheme, the anchor cylinder is provided with the through hole, and the lead wire of the independent voltage pole passes through the through hole and is connected with the voltmeter.
In the scheme, the FRP rib is a CFRP rib.
In the scheme, the CFRP rib is divided into 3 sections, namely a CFRP rib A section, a CFRP rib B section and a CFRP rib C section; the two ends of the CFRP rib A section 1 are respectively A 1 And A 2 Two ends of the CFRP rib B section are respectively B 1 And B 2 The two ends of the CFRP rib C section are respectively C 1 And C 2 ；
Both ends A of the CFRP rib 1 And C 2 The end surfaces of the electrodes are coated with conductive adhesive, electrode plates are respectively arranged to form an electric source electrode, and the electric source electrode is respectively called a first electrode and a second electrode;
A 2 、B 1 、B 2 and C 1 The section of the break is coated with conductive adhesive, and electrode plates are respectively arranged to form two independent voltage electrodes A 2 End and B 1 The independent electrode with the end section is a third electrode, B 2 And C 1 The independent electrode of the section is a fourth electrode;
the third electrode is provided with a first anchor cylinder which is connected with A 2 End and B 1 An end; a second anchor cylinder is arranged at the fourth electrode and is connected with B 2 End and C 1 An end; insulating glue is respectively injected into the first anchor cylinder and the second anchor cylinder; two ends of the first anchor cylinder and the second anchor cylinder are respectively provided with end plugs;
the first electrode and the second electrode are connected with the ammeter and the constant current power supply through lead wires.
And the third electrode and the fourth electrode are connected with the voltmeter through leads.
A measurement method using the multi-electrode sensing structure, comprising the steps of:
the power electrode is connected with the ammeter and the constant current power supply through wires, and the independent voltage electrode is connected with the ammeter through wires; when the FRP rib receives axial force, the FRP rib axially deforms, the resistance of the FRP rib changes, the output voltage changes, the ammeter displays a current value, and the voltmeter displays a voltage value;
and calculating a resistance change value through the current and voltage change values, converting the resistance change value into the section stress of the FRP rib, and judging the stress level of the FRP rib.
Compared with the prior art, the invention has the beneficial effects that:
1. the FRP rib in the component is adopted, and the current electrodes are arranged at the two ends of the FRP rib so as to apply monitoring current. Taking a plurality of sections of the FRP rib, dividing the FRP rib into a plurality of sections for breaking, and recording and maintaining the relative positions of the sections of the FRP rib. The two sections of the break are respectively designed as independent voltage poles. All electrodes are in full-section contact with the section of the FRP rib. The first electrode and the second electrode at two ends are connected with a current input system. The independent voltage electrodes of other sections are connected with a voltage output system. In order to ensure the bearing capacity of the FRP rib sections, anchor cylinders are respectively arranged on independent electrodes of the sections, and disconnected adjacent sections are connected; insulating glue is injected into the anchor cylinder to ensure that the anchor cylinder is insulated from the FRP ribs and each independent electrode. The bonding section of the anchor cylinder and the FRP rib needs to have a certain length, so that the voltage is not destroyed when the FRP rib is stressed.
2. The method is characterized in that when the method is used, a power source is connected with a constant-current power supply input system, and a voltage electrode is connected with a voltage output system; when the FRP rib receives axial force, the FRP rib generates axial deformation, the resistance of the FRP rib changes, the output voltage changes, the analysis system calculates the resistance change value according to the input current and voltage change values, the resistance change value is converted into the section stress of the FRP rib, the stress state of the FRP rib is judged, and corresponding results are output, so that the purposes of monitoring the FRP rib in real time and realizing health monitoring on components and structures are achieved.
3. The invention can form a four-electrode circuit for eliminating contact resistance while ensuring the self bearing capacity of the FRP rib, and can accurately monitor the stress state of the FRP rib in real time. The system has the advantages of simple structure, clear principle and convenient implementation.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Fig. 2 is a schematic diagram of a CFRP rib four-electrode sensing structure.
Fig. 3 is a detailed view of the electrode.
Fig. 4 is a longitudinal cross-sectional view of the four-electrode sensing structure at I in fig. 2.
Fig. 5 is a block diagram, wherein fig. 5a is a plan view and fig. 5b is a side view.
In the figure: the electrode comprises a CFRP rib A section, a CFRP rib B section, a 3 CFRP rib C section, a 4 first electrode, a 5 second electrode, a 6 third electrode, a 7 fourth electrode, an 8 constant current source, a 9 ammeter, a 10 voltmeter, a 11 first anchor barrel, a 12 second anchor barrel, a13 hole a, a14 hole B, a 15 wire, a 16 conductive adhesive, a 17 electrode slice, a 18 insulating adhesive and a 19 end plug.
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description, but the scope of the invention is not limited thereto.
A multi-electrode sensing structure comprises fiber reinforced composite (FRP) ribs, an anchor cylinder, conductive adhesive 16 and insulating adhesive 18;
the two end surfaces of the fiber reinforced composite (FRP) rib are coated with conductive adhesive 16, and electrode plates 17 are respectively arranged to form two electric sources; dividing the fiber reinforced composite material FRP into N sections for disconnection, coating the sections of the disconnected sections with conductive adhesive 16, and respectively arranging electrode plates 17 to form N-1 independent voltage poles; the independent voltage poles of the sections are respectively provided with an anchor cylinder, the anchor cylinders connect the adjacent disconnected sections, and insulating glue 18 is injected into the anchor cylinders; the power electrode is connected with the current input system through a wire, and the independent voltage electrode of the section is connected with the voltage output system through a wire.
The current input system comprises an ammeter 9 and a constant current power supply 8; the power electrode is connected with the ammeter 9 and the constant current power supply 8 through a lead, and the output current of the constant current power supply 8 is controllable.
The voltage output system comprises a voltmeter 10; the individual voltage poles are connected to the voltmeter 10 by wires.
End plugs 19 are respectively arranged at two ends of the anchor cylinder.
The anchor cylinder is provided with a through hole, and a wire of an independent voltage pole passes through the through hole and is connected with the voltmeter 10.
A measurement method using the multi-electrode sensing structure, comprising the steps of:
the power electrode is connected with an ammeter 9 and a constant current power supply 8 through a wire, and the voltage electrode is connected with a voltmeter 10 through a wire; when the fiber reinforced composite FRP rib receives axial force, the fiber reinforced composite FRP rib axially deforms, the resistance of the fiber reinforced composite FRP rib changes, the output voltage changes, the ammeter 9 displays a current value, and the voltmeter 10 displays a voltage value;
and calculating a resistance change value through the current and voltage change values, converting the resistance change value into the section stress of the fiber reinforced composite FRP rib, and judging the stress state of the fiber reinforced composite FRP rib.
The fiber reinforced composite (FRP) rib in this embodiment is preferably a carbon fiber composite reinforced (CFRP) rib.
As shown in fig. 1 and 2, the carbon fiber composite reinforced (CFRP) bar is divided into 3 sections, namely a CFRP bar a section 1, a CFRP bar B section 2 and a CFRP bar C section 3; the two ends of the CFRP rib A section 1 are respectively A 1 And A 2 Two ends of the CFRP rib B section 2 are respectively B 1 And B 2 The two ends of the CFRP rib C section 3 are respectively C 1 And C 2 。
As shown in fig. 3, the two ends a of the carbon fiber composite reinforced (CFRP) bar 1 And C 2 The end surfaces of the electrodes are coated with conductive adhesive 16, electrode plates 17 are respectively arranged to form electric source electrodes, and the electric source electrodes are respectively called a first electrode 4 and a second electrode 5;
A 2 、B 1 、B 2 and C 1 The section of the break is coated with conductive adhesive 16 and electrode plates 17 are respectively arranged to form two independent electrodes A 2 End and B 1 The independent electrode with the end section is a third electrode 6, B 2 And C 1 The individual electrode of the cross section is the fourth electrode 7.
The first electrode 4, the second electrode 5, the third electrode 6 and the fourth electrode 7 are respectively connected with the electrode plates 17 by leads, and after the conductive adhesive 16 is solidified, the CFRP rib A section 1, the CFRP rib B section 2 and the CFRP rib C section 3 are sequentially connected, and all the electrodes are connected by leads.
The third electrode 6 is provided with a first anchor cylinder 11 which is connected with A 2 End and B 1 An end; a second anchor cylinder 12 is arranged at the fourth electrode 7 and is connected with B 2 End and C 1 An end; the first anchor barrel 11 is provided with a hole a13, the second anchor barrel 12 is provided with a hole b14, the lead of the third electrode 6 is led out from the hole a13, and the fourth electrode 7Is led out of the hole B14, and the end plugs 19 are fixed to the a end and the B end of the first anchor cylinder 11, and the C end and the D end of the first anchor cylinder 12, respectively, as shown in fig. 5, wherein fig. 5a is a plan view and fig. 5B is a side view.
The position of the first anchor cylinder 11 is longitudinally adjusted along the CFRP rib so as to ensure that the first anchor cylinder 11 is positioned at the A of the CFRP rib A section 1 2 End, CFRP tendon B section 2B 1 The ends each have a sufficient anchoring length. Longitudinally adjusting the position of the second anchor cylinder 12 along the CFRP rib to ensure that the second anchor cylinder 12 is positioned at B of the CFRP rib B section 2 2 C of end CFRP rib B section 3 1 The ends each have a sufficient anchoring length. The high-strength insulating glue 18 is injected into the first anchor cylinder 11 through the hole a13, the high-strength insulating glue 18 is injected into the second anchor cylinder 12 through the hole a14, as shown in fig. 4, and the insulating glue is cured until the insulating glue is cured. The well-maintained CFRP bar is connected with an ammeter 9 and a constant current power supply 8 through a first electrode 4, a second electrode 5 and a lead 15. The CFRP rib B section is connected with the voltmeter 10 through the third electrode 6, the fourth electrode 7 and the lead 15.
A measurement method using the multi-electrode sensing structure, comprising the steps of:
the power electrode is connected with an ammeter 9 and a constant current power supply 8 through a wire, and the voltage electrode is connected with a voltmeter 10 through a wire; when the CFRP rib receives axial force, the CFRP rib generates axial deformation, the resistance of the CFRP rib changes, the output voltage changes, the ammeter 9 displays a current value, and the voltmeter 10 displays a voltage value;
and calculating a resistance change value through the current and voltage change values, converting the resistance change value into the section stress of the CFRP rib, and judging the stress state of the CFRP rib.
The invention can form a four-electrode circuit for eliminating contact resistance while ensuring the self bearing capacity of the FRP rib, and can accurately monitor the stress state of the FRP rib in real time. The system has the advantages of simple structure, clear principle and convenient implementation.
The above list of detailed descriptions is only specific to practical embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent embodiments or modifications that do not depart from the spirit of the present invention should be included in the scope of the present invention.
Claims (5)
1. The multi-electrode sensing structure is characterized by comprising FRP ribs, an anchor cylinder, conductive adhesive (16) and insulating adhesive (18);
conductive adhesive (16) is fully coated on the end surfaces of the two ends of the FRP rib, and electrode plates (17) are respectively arranged to form two electric sources; dividing the FRP into N sections, cutting off, coating the sections of the cutting-off parts with conductive adhesive (16), and respectively arranging electrode plates (17) to form N-1 independent voltage poles; the independent voltage poles of the sections are respectively provided with an anchor cylinder, the anchor cylinders connect the adjacent disconnected sections, and insulating glue (18) is injected into the anchor cylinders;
the power supply pole is connected with the current input system through a wire, and the independent voltage pole of the section is connected with the voltage output system through a wire;
the FRP ribs are CFRP ribs; the CFRP rib is divided into 3 sections which are a CFRP rib A section (1), a CFRP rib B section (2) and a CFRP rib C section (3) respectively; two ends of the CFRP rib A section (1) are respectively A 1 And A 2 Two ends of the CFRP rib B section (2) are respectively B 1 And B 2 Two ends of the CFRP rib C section (3) are respectively C 1 And C 2 ；
Both ends A of the CFRP rib 1 And C 2 The end surfaces of the electrodes are coated with conductive adhesive (16) and are respectively provided with electrode plates (17) to form an electric source, and the electric source is respectively called a first electrode (4) and a second electrode (5);
A 2 、B 1 、B 2 and C 1 The section of the break is coated with conductive adhesive (16) and electrode plates (17) are respectively arranged to form two independent voltage electrodes A 2 End and B 1 The independent electrode with the end section is a third electrode (6), B 2 And C 1 The independent electrode on the section is a fourth electrode (7);
a first anchor cylinder (11) is arranged at the third electrode (6) and is connected with A 2 End and B 1 An end; a second anchor cylinder (12) is arranged at the fourth electrode (7) and is connected with B 2 End and C 1 An end; the first anchor cylinder (11) and the second anchor cylinder (12) are internally provided withRespectively injecting insulating glue (18); two ends of the first anchor cylinder (11) and the second anchor cylinder (12) are respectively provided with end plugs (19);
the first electrode (4) and the second electrode (5) are connected with the ammeter (9) and the constant current power supply (8) through lead wires;
the third electrode (6) and the fourth electrode (7) are connected with the voltmeter (10) through leads;
the current input system comprises an ammeter (9) and a constant current power supply (8);
the power electrode is connected with the ammeter (9) and the constant current power supply (8) through lead wires.
2. The multi-electrode sensing structure according to claim 1, wherein the voltage output system comprises a voltmeter (10);
the independent voltage poles are connected with a voltmeter (10) through wires.
3. The multi-electrode sensing structure according to claim 1, wherein two ends of the anchor cylinder are respectively provided with end plugs (19).
4. The multi-electrode sensing structure according to claim 1, wherein the anchor cylinder is provided with a through hole, and a wire of an independent voltage pole passes through the through hole and is connected with the voltmeter (10).
5. A measurement method using the multi-electrode sensing structure of any one of claims 1-4, comprising the steps of:
the power supply pole is connected with an ammeter (9) and a constant current power supply (8) through a wire, and the independent voltage pole is connected with a voltmeter (10) through a wire; when the FRP rib receives axial force, the FRP rib generates axial deformation, the resistance of the FRP rib changes, the output voltage changes, the ammeter (9) displays a current value, and the voltmeter (10) displays a voltage value;
and calculating a resistance change value through the current and voltage change values, converting the resistance change value into the section stress of the FRP rib, and judging the stress level of the FRP rib.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810132645.9A CN108318537B (en) | 2018-02-09 | 2018-02-09 | Multi-electrode sensing structure and method thereof |
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| CN201810132645.9A CN108318537B (en) | 2018-02-09 | 2018-02-09 | Multi-electrode sensing structure and method thereof |
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Families Citing this family (2)
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| CN109539969A (en) * | 2018-12-29 | 2019-03-29 | 江苏大学 | A kind of structure monitoring system and its method |
| CN114935349A (en) * | 2022-05-31 | 2022-08-23 | 江苏大学 | Carbon powder modified multi-electrode CFRP intelligent sensing structure and preparation method thereof |
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