CN108918593B - Non-polarized electrode for concrete ERT imaging, manufacturing method and testing method - Google Patents
Non-polarized electrode for concrete ERT imaging, manufacturing method and testing method Download PDFInfo
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- CN108918593B CN108918593B CN201810448334.3A CN201810448334A CN108918593B CN 108918593 B CN108918593 B CN 108918593B CN 201810448334 A CN201810448334 A CN 201810448334A CN 108918593 B CN108918593 B CN 108918593B
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- 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 discloses a non-polarized electrode for concrete ERT imaging, a manufacturing method and a testing method, and relates to the technical field of concrete structure health monitoring; wrapping the carbon fiber rod electrode with epoxy resin to obtain a non-polarized electrode unit; the total number of the unpolarized electrode units is 8, the unpolarized electrode units are connected with the DuPont terminals and inserted into a plurality of rows of wires, and the wires are pressed by using the DuPont pliers to manufacture a row of wires with 8 electrode rods. The electrode manufactured by the invention can not generate extremely unstable and jump phenomenon, can monitor the concrete structure for a long time, can accurately position the position of the electrode, and can design electrodes with different sizes according to the size of the concrete structure.
Description
Technical Field
The invention relates to the technical field of concrete structure health monitoring, in particular to a non-polarized electrode for concrete ERT imaging, a manufacturing method and a testing method.
Background
The concrete structure has the advantages of good plasticity and moldability, high compressive strength, good durability, economy in material drawing and the like, and is widely applied to civil engineering, but in the use process, the concrete structure faces a series of durability problems of steel bar corrosion, freezing injury and environmental erosion in the service process. Such structures, once suddenly disabled, tend to produce catastrophic events. Therefore, in order to avoid engineering disasters, health monitoring of engineering structures becomes an effective means. At present, the health monitoring of the structure comprises an infrared imaging method, an impact echo method, an ultrasonic pulse method, a pulse radar method, a thermal imaging method, a dynamic detection method and the like, and the detection methods have the defects that:
(1) Only qualitative detection is possible, and internal information of the structure cannot be reflected;
(2) The detection timeliness is poor, and the structural damage evolution process cannot be given;
(3) Some monitoring methods are heavy in equipment and high in cost, and are not beneficial to popularization in engineering practice.
Electrical tomography (ERT) is an emerging process imaging technology for obtaining the distribution of multiphase media by determining the conductivity distribution of objects in a sensitive field based on different conductivities of different media, and has good application prospects in the field of industrial process parameter detection with the characteristics of no radiation, non-invasiveness, fast response speed, low cost, real-time visualization, and the like. The electrode is a sensor for receiving concrete electric field information, and the resolution capability of the electric field directly influences and even determines the accuracy and the reliability of inversion results, so that the electrode is an essential key auxiliary device in ERT. The urgent need of ERT technology is to improve the long-term stability of the electrode, especially to detect the concrete structure for a long time, and a non-polarized electrode with high survival rate, extremely small difference, long stability time and high measurement precision is urgently needed. The non-polarized electrode is an electrode which does not generate polarization phenomenon in the whole testing process, wherein the electrode polarization is the difference between the electrode potential and the electrode potential which is relatively balanced under the action of a fixed external electric field. Since concrete is a poor ionic conductor and metallic electrical conductors are electronic conductors, if the metallic conductors are brought into direct contact with the concrete, no new interface between the two media is created, thus creating a polarizing potential at this interface. If the polarization potentials between the two electrodes are not uniform, an additional electrode polarization potential V is generated in the subsequent measuring loop SP Finally, the observation of the ground electric field is influenced; in case of additional polarization potential V SP Instability can lead to inaccurate measurements. Therefore, ensuring the consistency and stability of the electrode polarization potential plays an important role in the electric field.
At present, the conductive copper gel electrode mentioned in Xu Dongliang doctor paper of university of martial arts, resistivity tomography research of smart concrete structure, has the following defects:
(1) The electrode is adhered to the surface of the structure, and the structure is easily stripped from the conductive copper adhesive electrode under the stress state, so that the poor contact between the electrode and the test block is caused, the data acquisition is influenced, and the imaging effect is not ideal;
(2) The used conductive copper glue electrode is expensive and is not beneficial to engineering application;
(3) The effect of electrode polarization is not considered; pb-Pbcl mentioned in the well-Earth ERT non-polarized electrode design and Performance study of Jilin university published in the Shuoshi paper 2 The large size of the shaped electrode may cause hidden trouble to structural stress when buried in a concrete structure.
Patent CN201804124U discloses a non-polarized electrode, which consists of a pole, an electrolyte and an electrode tank, wherein the electrode tank is cylindrical, the lower end of the electrode tank is conical, the conical electrode tank is filled with the electrolyte (prepared by adding water into lead chloride, sodium chloride or gypsum), holes are uniformly distributed on the wall of the conical electrode tank, the electrode is mainly used in the physical prospecting of the earth, the electrolyte is filled in the electrode, such as the electrode is used in concrete, and the electrolyte permeates into the concrete, thereby bringing adverse effects to the concrete structure.
Disclosure of Invention
In view of the above, the invention provides a non-polarized electrode for concrete ERT imaging, a manufacturing method and a testing method, which can solve the problems of inaccuracy of electrode polarization and electrode positioning in the electrical signal acquisition process of ERT technology in the prior art, transmit the potential value in concrete to a precise wire, and transmit the potential value back to a data acquisition system through the wire.
In order to achieve the above object, the present invention provides the following technical solutions:
a method for manufacturing a non-polarized electrode for concrete ERT imaging, comprising the steps of:
(1) Polishing a carbon fiber rod along the cross section direction to form an annular groove on the surface, cleaning the polished part with an acetone reagent after polishing, wiping the surface of the carbon fiber rod with a cotton swab dipped with the acetone reagent or absolute alcohol to remove dust on the surface, and naturally standing in a dust-free and moisture-proof environment for airing;
(2) After a wire is wound around the groove on the carbon fiber rod, the joint of the wire is spot-welded, so that the joint of the wire is smooth;
(3) After the spot welding is finished, conductive adhesive is coated on the grooves of the carbon fiber rods and the wire bonding part, the grooves are uniformly coated and completely covered, and the wires are ensured to be completely covered by the conductive adhesive, so that the carbon fiber rod electrode is manufactured;
(4) Placing the carbon fiber rod electrode vertically into a square groove mold, pouring epoxy resin into the square groove mold, wrapping the carbon fiber rod by the epoxy resin, and extending the lead from the upper part of the epoxy resin;
(5) After the epoxy resin is solidified, taking out the carbon fiber rod electrode coated with the epoxy resin from the die, grinding the epoxy resin covered on the surface layer of the carbon fiber rod at the lower end of the carbon fiber rod to expose the carbon fiber rod electrode, wiping the surface of the carbon fiber rod by using a cotton swab dipped with an acetone reagent or absolute alcohol after grinding, removing dust on the surface, naturally standing in a dust-free and moisture-proof environment, and airing to obtain a non-polarized electrode unit;
(6) The other end of the lead of the non-polarized electrode unit is connected to the DuPont terminal and is inserted into a plurality of rows of wire heads, the total number of the non-polarized electrode units is 8, the same connecting method is connected with the DuPont terminal and is inserted into a plurality of rows of wires, and the DuPont pliers are used for pressing the wires to manufacture a flat cable with 8 electrode bars.
Compared with the prior art, the invention has the advantages that:
(1) The electrode manufactured by the invention can not generate polarization phenomenon.
(2) The invention can accurately position the electrode, and can design electrodes with different sizes according to the size of the concrete structure.
(3) The invention has simple structure, stable performance and long service life, and can monitor the concrete structure for a long time; and the cost is low, and the method is suitable for wide application in civil engineering.
Drawing and description
FIG. 1 is a schematic diagram of a non-polarized electrode unit structure according to the present invention;
FIG. 2 is a schematic view of a non-polarized electrode core structure according to the present invention;
FIG. 3 is a schematic cross-sectional view of a non-polarized electrode unit according to the present invention;
FIG. 4 is a schematic view of the connection between the non-polarized electrode carbon fiber rods and DuPont terminals and rows of wire ends according to the present invention;
FIG. 5 is a schematic view of a concrete column with damage;
FIG. 6 is a schematic diagram of a mold for fixing an electrode;
FIG. 7 is a diagram of non-polarized electrode accuracy detection;
FIG. 8 is simulation experiment data;
FIG. 9 is data collected for a non-polarized electrode of the present invention;
fig. 10 is a diagram showing data acquisition by a common electrode.
In the figure, a conducting wire, b, epoxy resin, c, a carbon fiber rod, d, conductive adhesive, e, a non-polarized electrode contact surface, f, a polished electrode, g, a DuPont terminal, h and a plurality of rows of wire heads.
Detailed Description
Some embodiments of the invention are disclosed below and one skilled in the art can, based on the disclosure herein, suitably modify the process parameters to achieve this. It is expressly noted that all such similar substitutions and modifications will be apparent to those skilled in the art, and are deemed to be included in the present invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those skilled in the relevant art that variations and modifications can be made in the methods and applications described herein, and in the practice and application of the techniques of this invention, without departing from the spirit or scope of the invention.
A manufacturing method of a non-polarized electrode for concrete ERT imaging comprises the following steps:
(1) Polishing a ring groove with the height of about 1mm and the depth of about 0.5mm at the 5mm position of one end of the carbon fiber rod by using a polisher, wiping the surface of the carbon fiber rod by using a cotton swab dipped with an acetone reagent or absolute alcohol after finishing, removing dust on the surface, and naturally standing and airing in a dust-free and moisture-proof environment;
(2) After the wire 1 is wound around a groove at one end of the carbon fiber rod, the welding tin is used for spot welding the connecting part of the wire, so that the smoothness of the welding point is ensured;
(3) After the spot welding is finished, conductive adhesive is coated on the grooves of the carbon fiber rods and the wire bonding part, the grooves are uniformly coated and completely covered, and the wires are ensured to be completely covered by the conductive adhesive;
(4) Placing the carbon fiber rod electrode into a square groove mold, and pouring epoxy resin into the square groove;
(5) After the epoxy resin is solidified, the carbon fiber rod electrode is taken out of the die, one end of the wire which is not fixed is polished by a polishing machine until the epoxy resin covered on the surface layer of the wire is polished out to expose the carbon fiber rod electrode, after the polishing is finished, a cotton swab dipped with an acetone reagent or absolute alcohol is used for wiping the surface of the carbon fiber rod, dust on the surface is removed, and the carbon fiber rod electrode is naturally placed in a dust-free and moisture-proof environment for airing;
(6) The other end of the wire is connected to the DuPont terminal and is inserted into a plurality of rows of wire heads, the plurality of rows of wire heads have 8 DuPont terminal interfaces, and the same method is used, so that the total 8 DuPont terminals are finally inserted into the plurality of rows of wires and are pressed by the DuPont pliers, and the wire with 8 unpolarized electrode wires is manufactured.
Preferably, the wire is a dupont colored wire or copper core. And welding the lead to the corresponding position of the electrode plate by using an electric soldering iron, wherein the power of the electric soldering iron is 300W, and the welding time is controlled to be 2-3 s so as to keep the balance and smoothness of welding spots.
Preferably, the joints of the wires are multiple rows of wire heads of the DuPont, and the DuPont is convenient to connect with the acquisition system.
Preferably, the die is made of stainless steel, titanium alloy or copper, and the size is 2cm multiplied by 5cm; the release agent is one or more of paraffin, glycerol and vaseline; vaseline is smeared at the gap of the die to avoid slurry leakage.
Example 1
The non-polarized electrode in the invention is preferably a carbon fiber rod c electrode, and the carbon fiber rod is produced by Boka carbon fiber technology Co., ltd, and has a length of 50mm and a diameter of 15mm. Polishing a circular groove with the diameter of about 1mm and the depth of about 0.5mm on one end of the carbon fiber rod c at about 5mm by using a polisher, wiping the surface of the carbon fiber rod by using a cotton swab dipped with an acetone reagent or absolute alcohol, removing dust on the surface, and naturally standing and airing in a dust-free and moisture-proof environment. A DuPont color wire with the length of the wire a being about 1000mm is cut, one end of the wire a is stripped off the insulating skin on the outer surface by about 5mm, and copper wires inside the wire a are leaked. The copper wire leaked from the lead a is welded to the carbon fiber rod by using the aluminum-tin active solder, the power of the electric soldering iron is 300W, the welding time is controlled to be 2-6 s, the welding point is kept smooth, and the welding time is not easy to be too long, so that the performance of the carbon fiber is prevented from being influenced due to the fact that the welding temperature is too high. After the spot welding is finished, the conductive adhesive d is coated on the combined part of the groove of the carbon fiber rod c and the lead a, the groove is uniformly coated and completely covered, and the lead a is ensured to be completely covered by the conductive adhesive d. The carbon fiber rod c electrode is placed in a square groove die, and epoxy resin b is poured into the square groove. And after the epoxy resin b is solidified, taking out the carbon fiber rod c electrode from the die, polishing one end of the unfixed wire a by using a polishing machine until the epoxy resin b covered on the surface layer of the unfixed wire a is polished out, and exposing the carbon fiber rod c electrode, namely, the unpolarized electrode contact surface e. Wiping the surface of the carbon fiber rod with a cotton swab dipped with an acetone reagent or absolute alcohol to remove dust on the surface, and naturally standing and airing the carbon fiber rod in a dust-free and moisture-proof environment. The other end of the lead a is connected to the DuPont terminal g and is inserted into the plurality of rows of wire heads h, 8 DuPont terminals g are inserted into the plurality of rows of wires in the same method, and the wires are pressed by using the DuPont pliers to manufacture the wire with 8 unpolarized electrodes. The dupont terminal g and the plurality of rows of wire heads h used in the scheme are manufactured and produced by Sanyijia electronic limited company of Shenzhen city.
Example 2
And (5) detecting and testing the precision of the unpolarized electrode.
Detection 1: the electrode of the invention is polished at one end of the unfixed lead a by a polishing machine until the epoxy resin b covered on the surface layer is polished to expose the electrode c of the carbon fiber rod, namely the unpolarized electrode contact surface e, the 16 polished electrodes f are uniformly distributed along the circumference to the periphery of a concrete cylinder shown in fig. 5 and are fixed by a die shown in fig. 6, the concrete cylinder is manufactured to be damaged artificially, the unpolarized electrode of the invention is compared with the commercial metal electrode in precision, and the damage detection time is recorded, as shown in fig. 7. The results show that with the advancement of time, the imaging precision of each electrode is further optimized (the positions with high density on the cylinder and the image are corresponding, the better the corresponding positions are, the better the accuracy is, the better the quality of the electrode is indirectly indicated), and the non-polarized electrode of the carbon fiber has higher relative precision, so that the non-polarized electrode has advantages on the acquisition precision of data and the imaging quality.
Example 3
And (5) detecting and testing the precision of the unpolarized electrode.
Detection 2: after the electrode in the detection 1 is connected with the concrete by the contact method, voltage data acquisition is carried out by adopting a PXI platform of an NI company, and the platform has strong data acquisition and data processing capacity, wherein the used matrix switch PXI-2532 has high flexibility, so that the electrode is simpler and more convenient to switch, and the efficiency in data acquisition is higher. The numerical values collected by the non-polarized electrode and the commercial metal electrode are respectively compared with simulation data, and the simulation data are manufactured by matlab and comsol software. As shown in fig. 7, 8 and 9, the test data collected by the carbon fiber electrode of the present invention is closer to the simulation data. The electrode of the invention can not generate extremely poor instability phenomenon and jump phenomenon, and can monitor the concrete structure for a long time.
The application method of the non-polarized electrode for concrete ERT imaging comprises the following steps: preparing a mould, coating a release agent on the inner surface of the mould, embedding the concrete ERT imaging unpolarized electrode into the stirred mortar, curing after forming, and removing the mould to acquire data. The concrete ERT imaging unpolarized electrode employed in this test is more suitable for monitoring in reinforced concrete structures than other ERT electrodes. In the construction process, the electrode is buried in the concrete, and the health condition of the reinforced concrete structure can be monitored on line in a long time later.
The working principle of the non-polarized electrode for concrete ERT imaging is as follows: the method comprises the steps of embedding electrodes in a concrete structure, embedding the concrete in a stress column or Liang Dengwei of a building after the concrete is solidified, applying excitation signals (electric signals) from the outside of a detected object through the designed electrodes when the structure is subjected to external load, gating and applying excitation source signals on a preset excitation electrode pair through a multiplexing switch module under the control of a computer projection control module, generating response signals on measuring electrodes of the excitation source signals through detection samples by the excitation signals, inputting the response signals on the samples into a projection data acquisition module through gating of the multiplexing switch module, acquiring the projection data into a computer, exciting and measuring the projection data by using the next group of excitation measuring electrodes to obtain another projection data, repeating the steps, obtaining one group of projection data of the detected object due to different distribution of internal resistivity parameters of the detected object, and inverting and reconstructing the projection data to obtain ERT of the detected object to analyze the stress state of the detected object.
Example 4
A test method for a concrete ERT imaging unpolarized electrode adopts a PXI platform of NI company to collect voltage data, and a matrix switch PXI-2532 is used; the injected current was 20mA; and performing an adjacent method test according to the arrangement mode of the unpolarized electrodes.
The adjacent method comprises the following steps:
first, 16 electrodes are numbered 0 electrode, 1 electrode, 2 electrode, … electrode, 15 electrode in this order clockwise.
Secondly, through a PXI platform, a matrix switch PXI-2532 is utilized to input current to a 0 electrode, a 1 electrode outputs current to form an electric field, and every two adjacent electrodes return a voltage value, such as a test voltage value between two electrodes of 2 electrodes and 3 electrodes; testing voltage values between the electrodes of the 4 electrode and the 5 electrode; … …; testing voltage values between the 12 electrode and the 13 electrode; testing voltage values between the 14 electrode and the 15 electrode; the voltage values obtained above are recorded in a statistical table.
Inputting current to the electrode 1, outputting current to the electrode 2, forming an electric field, and returning a voltage value to every two adjacent electrodes, for example, testing the voltage value between the electrode 3 and the electrode 4; testing voltage values between the electrodes 5 and 6; … …; testing voltage values between the electrodes 13 and 14; testing voltage values between the 15 electrode and the 0 electrode; the voltage values obtained above are recorded in a statistical table.
Similarly, the obtained voltage values are recorded in a statistical table.
Finally, inputting current to the 15 electrodes, outputting current to the 0 electrodes to form an electric field, and returning a voltage value to every two adjacent electrodes, for example, testing the voltage value between the 1 electrode and the 2 electrode; testing voltage values between the electrodes 3 and 4; … …; testing voltage values between the 11 electrode and the 12 electrode; testing voltage values between the electrodes 13 and 14; the voltage values obtained above are recorded in a statistical table.
Namely, each time of current input and output, 13 groups of voltage values are obtained, 16 groups of injection current modes exist in total, and 208 groups of voltage values are finally obtained; the voltage values obtained above are recorded in a statistical table.
Example 5
A test method for a concrete ERT imaging unpolarized electrode adopts a PXI platform of NI company to collect voltage data, and a matrix switch PXI-2532 is used; the injected current was 20mA; the relative method test is carried out according to the arrangement mode of the unpolarized electrodes.
The relative method comprises the following steps:
first, 16 electrodes are numbered 0 electrode, 1 electrode, 2 electrode, … electrode, 15 electrode in this order clockwise.
Secondly, through a PXI platform, a matrix switch PXI-2532 is utilized to input current to a 0 electrode, and current is output to an 8 electrode to form an electric field, and every two adjacent electrodes return a voltage value, such as a test voltage value between two electrodes of a 1 electrode and a 2 electrode; testing voltage values between the electrodes 3 and 4; … …; testing voltage values between the two electrodes of the 7 electrode and the 9 electrode; … …; testing voltage values between the 12 electrode and the 13 electrode; testing voltage values between the 14 electrode and the 15 electrode; the voltage values obtained above are recorded in a statistical table.
Inputting current to the electrode 1, outputting current to the electrode 9, forming an electric field, and returning a voltage value to every two adjacent electrodes, for example, testing the voltage value between the electrode 2 and the electrode 3; testing voltage values between the electrodes of the 4 electrode and the 5 electrode; … …; testing voltage values between the 8 electrode and the 10 electrode; … …; testing voltage values between the electrodes 13 and 14; testing voltage values between the 15 electrode and the 0 electrode; the voltage values obtained above are recorded in a statistical table.
Similarly, the obtained voltage values are recorded in a statistical table.
Finally, inputting current to the 15 electrodes, outputting current to the 7 electrodes, forming an electric field, and returning a voltage value to every two adjacent electrodes, for example, testing the voltage value between the 0 electrode and the 1 electrode; testing voltage values between the two electrodes of the 2 electrode and the 3 electrode; … …; testing voltage values between the electrodes of the 6 electrode and the 8 electrode; … …; testing voltage values between the electrodes 13 and 14; the voltage values obtained above are recorded in a statistical table.
Namely, each time of current input and output, 13 groups of voltage values are obtained, 16 groups of injection current modes exist in total, and 208 groups of voltage values are finally obtained; the voltage values obtained above are recorded in a statistical table.
By way of the analysis carried out in examples 1 to 5, the invention compares with the prior art:
(1) The electrode manufactured by the invention can not generate polarization phenomenon. The phenomenon of polarization, i.e., the phenomenon that when a current passes through an electrode, a net reaction occurs, which indicates that the electrode loses its original equilibrium state and the electrode potential deviates from the equilibrium potential, is called electrode polarization. The reason why the invention does not occur is that the carbon fiber has stable electrical properties, and an electrode with very stable potential can be established. The electrode polarization caused when the external current passes through the electrode is very small and the electrode quickly returns to its original stable potential when the external current is removed.
(2) The invention can accurately position the electrode, and can design electrodes with different sizes according to the size of the concrete structure. FIG. 8 is data obtained by simulation of 16 electrodes using comsol with current neighbor injection and voltage neighbor in ERT imaging; FIG. 9 is voltage data acquired using a non-polarized carbon fiber electrode of the present invention; fig. 10 is voltage data collected using a commercially available common electrode. From the three graphs, it can be obviously derived that the voltage acquired by using the non-polarized electrode is closer to the simulated data, the generated noise error is smaller, and the imaging precision is greatly improved. The voltage value acquired by the common electrode has large obvious noise and large amplitude variation, and poor imaging precision is generated.
(3) The invention has simple structure, stable performance and long service life, and can monitor the concrete structure for a long time; and the cost is low, and the method is suitable for wide application in civil engineering.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (4)
1. The manufacturing method of the non-polarized electrode for concrete ERT imaging is characterized by comprising the following steps of:
polishing a carbon fiber rod along the cross section direction to form an annular groove on the surface, cleaning the polished part with an acetone reagent after polishing, wiping the surface of the carbon fiber rod with a cotton swab dipped with the acetone reagent or absolute alcohol to remove dust on the surface, and naturally standing in a dust-free and moisture-proof environment for airing; the carbon fiber rod is used as a receiving end of the electric signal;
after a wire is wound around the groove on the carbon fiber rod, the joint of the wire is spot-welded, so that the joint of the wire is smooth; the lead is a DuPont copper core wire; after the spot welding is finished, conductive adhesive is coated on the grooves of the carbon fiber rods and the wire bonding part, the grooves are uniformly coated and completely covered, and the wires are ensured to be completely covered by the conductive adhesive, so that the carbon fiber rod electrode is manufactured; the conductive adhesive is conductive resin adhesive;
placing the carbon fiber rod electrode vertically into a square groove mold, pouring epoxy resin into the square groove mold, wrapping the carbon fiber rod by the epoxy resin, and extending the lead from the upper part of the epoxy resin;
after the epoxy resin is solidified, taking out the carbon fiber rod electrode coated with the epoxy resin from the die, grinding the epoxy resin covered on the surface layer of the carbon fiber rod at the lower end of the carbon fiber rod to expose the carbon fiber rod electrode, wiping the surface of the carbon fiber rod by using a cotton swab dipped with an acetone reagent or absolute alcohol after grinding, removing dust on the surface, naturally standing in a dust-free and moisture-proof environment, and airing to obtain a non-polarized electrode unit;
the other end of the lead of the non-polarized electrode unit is connected to the DuPont terminal and is inserted into a plurality of rows of wire heads, the total number of the non-polarized electrode units is 8, the same connecting method is connected with the DuPont terminal and is inserted into a plurality of rows of wires, and the DuPont pliers are used for pressing the wires to manufacture a flat cable with 8 electrode bars.
2. The method of manufacturing a non-polarized electrode for concrete ERT imaging of claim 1, wherein the carbon fiber rod has a length of 50mm and a diameter of 15mm; the length, width and height of the square groove mold are 20, 20 and 50mm; the distance between the groove and the upper end of the carbon fiber rod is 5mm; the width of the groove is 1mm, and the depth is 0.5mm.
3. The method for manufacturing a non-polarized electrode for concrete ERT imaging of claim 1, wherein a mold release agent is used in step (5), and the mold release agent is one or more of paraffin, glycerol, and vaseline; and coating vaseline at the gap of the square groove die.
4. A non-polarized electrode for concrete ERT imaging, characterized in that the non-polarized electrode is obtained by the method according to any one of claims 1-3.
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