CN113884435B - Corrosion monitoring sensor, measurement system and measurement analysis method based on array four-probe potential drop technology - Google Patents
Corrosion monitoring sensor, measurement system and measurement analysis method based on array four-probe potential drop technology Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
Abstract
The invention provides a corrosion monitoring sensor, a measuring device and a measuring analysis method based on an array four-probe potential drop technology, wherein the sensor comprises a corrosion sensitive element, a temperature compensation element, a test probe, a PCB (printed circuit board), a sensor shell, a wiring terminal and a multi-core shielding wire; the corrosion sensitive element and the temperature compensation element are positioned at the bottom of the sensor shell; the corrosion sensitive element and the temperature compensation element are respectively provided with a test probe, the corrosion sensitive element and the temperature compensation element are electrically connected with the test probes, the top of the test probes is fixedly arranged on the PCB, the multi-core shielding wire is electrically connected with the PCB through a wiring terminal, and the multi-core shielding wire comprises a plurality of wires which are electrically connected with the test probes in a one-to-one correspondence manner; epoxy resin pouring sealant is filled in the sensor shell. The monitoring sensor provided by the invention can monitor the local corrosion depth of the test piece under the condition that the integrity of the corrosion sensitive element is not damaged.
Description
Technical Field
The invention relates to the technical field of automatic monitoring, in particular to a corrosion monitoring sensor, a measuring system and a measuring analysis method based on an array four-probe potential drop technology.
Background
The problem of metal corrosion can cause huge losses and serious safety hazards, and the global economic loss caused by metal corrosion can reach billions of dollars each year. Because the natural environment where the metal structure is located is complex and changeable, the corrosion often has different damage forms, and the structure can be uniformly corroded, namely, the corrosion rates of all areas on the surface of the metal structure are basically the same; non-uniform corrosion may also occur, i.e., distinct differences in corrosion rates across different areas of the metal structure, resulting in localized corrosion rates greater than the overall average corrosion rate, with corrosion damage occurring at specific areas of the metal structure surface. Compared with the uniform corrosion, the material loss caused by the non-uniform corrosion is not large, but the hazard is serious due to the non-uniform concealment, and in actual engineering, most of various corrosion failure accidents are local damages. By arranging the sensors around the metal structure to monitor the non-uniform corrosion behavior, grasp the time of corrosion occurrence, judge the non-uniform degree of corrosion, measure the local corrosion rate, timely design a reasonable corrosion protection scheme according to the monitoring result, improve the safety of the structure, prolong the service life of the metal structure and reduce the economic loss caused by corrosion. Therefore, developing a monitoring technique for non-uniform corrosion is of great engineering importance.
The existing corrosion monitoring technology based on direct measurement can be divided into two types, namely a single-electrode testing system and a multi-electrode testing system.
The electrode test system is characterized in that an electrode test piece with the same material as the metal structure to be monitored is placed in a corrosion environment to simulate the metal structure in the environment, and the corrosion rate of the electrode test piece is tested on the premise that the original corrosion state of the electrode test piece is not affected, and commonly adopted technologies can be divided into an electrochemical test technology and a resistance test technology. The electrochemical test technology is established based on the nature of corrosion electrochemistry, the corrosion rate of the electrode test piece can be monitored in real time through the electrochemical test, the resistance test technology is a measurement means established based on ohm's law, and the measurement result directly reflects the residual thickness of the electrode test piece. However, the single electrode test system based on the two technologies can only react the average corrosion information of the single electrode test piece, and cannot react the local corrosion information, so that the corrosion type and the corrosion depth of the most severely corroded area cannot be judged through the monitoring result.
A multi-electrode test system is characterized in that a group of electrode test pieces with the same material as a monitored metal structure are placed in a corrosion environment to simulate the metal structure in the environment, a plurality of corrosion models are built by measuring galvanic current information among the electrodes and potential information of the electrodes, and the corrosion rate of the electrodes is calculated, so that the non-uniformity degree of corrosion can be obtained, the corrosion type is judged, and the corrosion rate of the most dangerous area can be obtained. Multi-electrode test systems rely on galvanic currents between the individual electrodes for some high resistance media environments, such as: the calculated corrosion depth obtained by measuring galvanic current conversion is inaccurate, and galvanic current may not be measured, which results in the risk of test failure of the technology.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a corrosion monitoring sensor, a measuring system and a measuring analysis method based on an array four-probe potential drop technology, which can measure the non-uniform corrosion information of the whole electrode under the condition of not damaging the integrity of the electrode.
The invention adopts the following technical means:
a corrosion monitoring sensor based on an array four-probe potential drop technology comprises a corrosion sensitive element, a temperature compensation element, a test probe, a PCB (printed circuit board), a sensor shell, a wiring terminal and a multi-core shielding wire;
the corrosion sensitive element and the temperature compensation element are positioned at the bottom of the sensor shell, the corrosion sensitive element is positioned at the center of the bottom surface of the sensor shell, and the temperature compensation element is positioned at the side surface of the corrosion sensitive element;
the corrosion sensing element and the temperature compensation element are respectively provided with the test probes, the corrosion sensing element and the temperature compensation element are electrically connected with the test probes, the top of the test probes is fixedly arranged on the PCB, the multi-core shielding wire is electrically connected with the PCB through the wiring terminals, the multi-core shielding wire comprises a plurality of wires, and the wires are electrically connected with the test probes in a one-to-one correspondence manner; and epoxy resin pouring sealant is filled in the sensor shell.
Further, the corrosion sensitive element and the temperature compensation element are made of the same material; and the bottom of the temperature compensation element is sprayed with chromium oxide ceramic.
Further, the bottom surface of the corrosion sensitive element is square; the bottom surface of the temperature compensation element is rectangular, and the length of the long side of the bottom surface of the temperature compensation element is the same as the square side length of the bottom surface of the corrosion sensitive element.
Further, the corrosion sensitive element is connected with n×n test probes, the n×n test probes are arranged in a square array, the distances between adjacent test probes are equal, the corrosion sensitive element is divided into (n-1) x (n-1) measurement areas, and each measurement area comprises four adjacent test probes in square arrangement; the temperature compensation element is connected with 4 test probes, and the 4 test probes are positioned on the same straight line and distributed at equal intervals.
The invention also provides a corrosion depth measuring device based on the array four-probe potential drop technology, which comprises a corrosion monitoring sensor based on the array four-probe potential drop technology, a multi-channel switching device, a high-precision voltmeter, a constant current source and a computer, wherein the multi-channel switching device is connected with the corrosion monitoring sensor through a multi-core shielding wire, the high-precision voltmeter and the constant current source are connected with the multi-channel switching device, the high-precision voltmeter is connected to 2 test probes on one side of a corrosion sensitive element measuring area and two test probes on the inner side of a temperature compensation element through the multi-channel switching device, and the constant current source is connected to 2 test probes on the other side of the corrosion sensitive element measuring area and two test probes on the outer side of the temperature compensation element through the multi-channel switching device;
the computer is respectively connected with the high-precision voltmeter, the constant current source and the multi-channel switching device and used for controlling the constant current source to provide current for the measuring area or the temperature compensation element through the multi-channel switching device and measuring voltage data through the high-precision voltmeter; the computer is also used for controlling the multi-channel switching device to sequentially select (n-1) x (n-1) measuring areas on the corrosion sensitive element to measure voltage data;
the high-precision voltmeter is used for measuring voltage data of each measuring area and the temperature compensation element and transmitting the voltage data to the computer, and the computer is used for calculating wall thickness losses of different measuring areas on the corrosion sensitive element according to the voltage data of the corrosion sensitive element measuring areas and the temperature compensation element.
Further, the core part of the multi-channel switching device is two groups of switch matrixes, and each group of switch matrixes consists of 2n groups of switch matrixes 2 And the other group is a voltage switch matrix and is used for selecting two test probes connected with the high-precision voltmeter in the selected measuring area.
The invention also provides a measuring and analyzing method based on the array four-probe potential drop technology, which adopts the corrosion depth measuring device based on the array four-probe potential drop technology and comprises the following steps:
s01: installing a corrosion monitoring sensor based on an array four-probe potential drop technology: cleaning the surface of the corrosion monitoring sensor by using alcohol, drying by using cold air, placing the corrosion monitoring sensor in a region to be monitored, and connecting the multi-core shielding wire into a multi-channel switching device;
s02: selecting a corrosion sensitive element measuring area through a multi-channel switching device;
s03: controlling a constant current source to output excitation current;
s04: controlling the high-precision voltmeter to measure voltage data;
s05: repeating the steps S02-S04 until the voltage data of the temperature compensation element and all corrosion sensitive element measuring areas are measured;
s06: calculating partition coefficient alpha of each measurement area according to the measured voltage data (i,j) Calculating each measuring area by a neural network algorithmWall thickness loss at of domain (i,j) And drawing a depth cloud image.
Further, calculating the wall thickness loss of each measurement region from the measured voltage data specifically includes the steps of:
the partition coefficient alpha of each measurement area is calculated according to the following method (i,j) ：
Wherein T is 0 To corrode the original thickness of the sensitive element, U (i,j) * For voltage data of corrosion sensitive element measuring area [ i, j ] after corrosion occurs, U (i,j) Is the voltage data of the corrosion sensitive element measuring area [ i, j ] in the original state, U ref * For voltage data of temperature compensation element after corrosion occurs, U ref Voltage data of the temperature compensation element in an original state;
wall thickness loss ΔT due to each measurement region (i,j) Partition coefficient alpha with each measurement region (i,j) A nonlinear mapping relation exists between the two coefficients, and a neural network model is used for measuring the partition coefficient alpha (i,j) Calculating the wall thickness loss of each partition:
compared with the prior art, the invention has the following advantages:
the corrosion monitoring sensor, the measuring device and the measuring analysis method provided by the invention can be suitable for various complex corrosion environments (atmospheric environment, marine environment, concrete environment, soil environment and the like), find the corresponding relation between the array voltage test result and the metal wall thickness of different areas, not only can monitor the average corrosion depth of a metal test piece in the current environment in real time, but also can monitor the local corrosion depth of the test piece on the premise of not damaging the integrity of the test piece.
Based on the reasons, the method can be widely popularized in the field of monitoring the local corrosion of the metal material.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic diagram of the general structure of a corrosion monitoring sensor according to the present invention.
FIG. 2 is a schematic view of the measurement areas of the corrosion sensitive element according to the present invention.
FIG. 3 is a schematic view of a corrosion measurement apparatus according to the present invention.
Fig. 4 is a schematic diagram of a switch matrix according to the present invention.
Fig. 5 is a schematic diagram of measuring voltage data of a single measurement area by using the measuring device of the present invention.
FIG. 6 is a flow chart of a measurement analysis method according to the present invention.
In the figure: 1. corrosion sensitive elements; 2. a temperature compensation element; 3. a test probe; 4. a PCB circuit board; 5. a sensor housing; 6. epoxy resin pouring sealant; 7. a connection terminal; 8. a multi-core shielded wire.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be clear that the dimensions of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention: the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.
Example 1
As shown in fig. 1, the invention provides a corrosion monitoring sensor based on an array four-probe potential drop technology, which comprises a corrosion sensitive element 1, a temperature compensation element 2, a test probe 3, a PCB (printed circuit board) 4, a sensor housing 5, a wiring terminal 7 and a multi-core shielding wire 8;
the corrosion sensitive element 1 and the temperature compensation element 2 are positioned at the bottom of the sensor housing 5, the corrosion sensitive element 1 is positioned at the center of the bottom surface of the sensor housing 5, and the temperature compensation element 2 is positioned at the side surface of the corrosion sensitive element 1;
the corrosion sensitive element 1 and the temperature compensation element 2 are respectively provided with the test probe 3, the corrosion sensitive element 1, the temperature compensation element 2 and the test probe 3 are electrically connected, the top of the test probe 3 is fixedly arranged on the PCB 4, the multi-core shielding wire 8 is electrically connected with the PCB 4 through the wiring terminal 7, and the multi-core shielding wire 8 comprises a plurality of wires which are electrically connected with the test probes 3 in a one-to-one correspondence; and an epoxy resin pouring sealant 6 is filled in the sensor shell 5.
Further, the lower end face of the sensor is a test interface for contacting corrosive media.
Further, the material of the corrosion sensitive element 1 is the same as that of the temperature compensation element 2; the bottom of the temperature compensation element 2 is sprayed with chromium oxide ceramic.
Further, the bottom surface of the corrosion sensitive element 1 is square; the bottom surface of the temperature compensation element 2 is rectangular, and the length of the long side of the bottom surface of the temperature compensation element 2 is the same as the square side of the bottom surface of the corrosion sensitive element 1.
Further, as shown in fig. 2, the corrosion sensitive element 1 is connected with n×n test probes, the n×n test probes are arranged in a square array, the distances between adjacent test probes are equal, the corrosion sensitive element 1 is divided into (n-1) x (n-1) measurement areas, and each measurement area comprises four adjacent test probes arranged in a square shape; the temperature compensation element 2 is connected with 4 test probes, and the 4 test probes are positioned on the same straight line and distributed at equal intervals.
Further, the materials of the corrosion sensitive element 1 and the temperature compensation element 2 may be determined according to the material of the monitored object, and may be any metal material that may be damaged, including: steel, aluminum alloy, magnesium alloy, brass, titanium alloy, etc.; the distance between the corrosion-sensitive element and the temperature-compensating element is reduced as much as possible while ensuring insulation from each other.
As shown in fig. 3, the invention further provides a corrosion depth measuring device based on the array four-probe potential drop technology, which comprises a corrosion monitoring sensor based on the array four-probe potential drop technology, a multi-channel switching device, a high-precision voltmeter, a constant current source and a computer, wherein the multi-channel switching device is connected with the corrosion monitoring sensor through the multi-core shielding wire 8, the high-precision voltmeter and the constant current source are connected with the multi-channel switching device, the high-precision voltmeter is connected to 2 test probes on one side of a measurement area of the corrosion sensitive element 1 and two test probes on the inner side of the temperature compensation element 2 through the multi-channel switching device, and the constant current source is connected to 2 test probes on the other side of the measurement area of the corrosion sensitive element 1 and two test probes on the outer side of the temperature compensation element 2 through the multi-channel switching device;
the computer is respectively connected with the high-precision voltmeter, the constant current source and the multi-channel switching device and is used for controlling the constant current source to provide current for the corrosion sensitive element 1 measuring area or the temperature compensation element 2 through the multi-channel switching device and measuring voltage data through the high-precision voltmeter; the computer is also used for controlling the multi-channel switching device to sequentially select (n-1) x (n-1) measuring areas on the corrosion sensitive element 1 to measure voltage data;
the high-precision voltmeter measures voltage data of each corrosion sensitive element 1 measuring area and each temperature compensation element 3 and transmits the voltage data to the computer, and the computer calculates wall thickness loss (corrosion depth) of different measuring areas on the corrosion sensitive element according to the voltage data of the corrosion sensitive element 1 measuring area and the temperature compensation element 2.
As shown in fig. 4, the core part of the multi-channel switching device is two groups of switch matrixes, and each group of switch matrixes consists of 2n 2 A plurality of switches, wherein all default states of the switches are in an off state, one group is a current switch matrix (fig. 4 (a)) for selecting two test probes connected to the constant current source in a selected measurement area, and the other group is a voltage switch matrix (fig. 4 (B)) for selecting a selected measurement areaTwo test probes connected with the high-precision voltmeter in the measurement area;
for example: when the measuring area (1, 1) is selected, the switch (1, 1) B and the switch (1, 2) A in the current switch matrix are closed (fig. 4 (C)), the positive end of the constant current source is connected with the corrosion sensitive element through the switch (1, 1) B and the test probe (1, 1), the negative end of the constant current source is connected with the sensitive element through the switch (1, 2) A and the test probe (1, 2), the switch (2, 1) D and the switch (2, 2) C in the voltage switch matrix are closed (fig. 4 (D)), the positive end of the high-precision voltmeter is connected with the corrosion sensitive element through the switch (2, 1) D and the test probe (2, 1), the negative end of the high-precision voltmeter is connected with the corrosion sensitive element through the switch (2, 2) C and the test probe (2, 2), and the voltage U is measured (1,1) . Meanwhile, the constant current source is connected to two test probes positioned on the outer side of the temperature compensation element through the test probes, the high-precision voltmeter is connected with two test probes positioned on the inner side of the temperature compensation element, and the voltage signal U is obtained through measurement ref 。
As shown in fig. 5, which is a schematic diagram of the corrosion depth measuring device when measuring voltage data of a certain measuring area, taking the partitioning of [ 1,1 ] as an example, the current output by the constant current source flows through the temperature compensation element 2 and the corrosion sensitive element 1 first and then, 2 voltage signals are measured by the high-precision voltmeter, and the measured voltage of the temperature compensation element is denoted as U (1,1) The measured voltage of the corrosion sensitive element is denoted as U ref 。
As shown in fig. 6, the invention further provides a measurement and analysis method based on the array four-probe potential drop technology, and the corrosion depth measurement device based on the array four-probe potential drop technology comprises the following steps:
s01: installing a corrosion monitoring sensor based on an array four-probe potential drop technology: cleaning the surface of the corrosion monitoring sensor by using alcohol, drying by using cold air, placing the corrosion monitoring sensor in a region to be monitored, and connecting the multi-core shielding wire into a multi-channel switching device;
s02: selecting a corrosion sensitive element measuring area through a multi-channel switching device;
s03: controlling a constant current source to output excitation current;
s04: controlling the high-precision voltmeter to measure voltage data;
s05: repeating the steps S02-S04 until the voltage data of the temperature compensation element and all corrosion sensitive element measuring areas are measured;
s06: calculating partition coefficient alpha of each measurement area according to the measured voltage data (i,j) Calculating the wall thickness loss delta T of each measuring area through a neural network algorithm (i,j) And drawing a depth cloud image.
Further, calculating the wall thickness loss of each measurement region from the measured voltage data specifically includes the steps of:
the partition coefficient alpha of each measurement area is calculated according to the following method (i,j) ：
Wherein T is 0 To corrode the original thickness of the sensitive element, U (i,j) * For voltage data of corrosion sensitive element measuring area [ i, j ] after corrosion occurs, U (i,j) Is the voltage data of the corrosion sensitive element measuring area [ i, j ] in the original state, U ref * For voltage data of temperature compensation element after corrosion occurs, U ref Voltage data of the temperature compensation element in an original state;
wall thickness loss ΔT due to each measurement region (i,j) Partition coefficient alpha with each measurement region (i,j) A nonlinear mapping relation exists between the two coefficients, and a neural network model is used for measuring the partition coefficient alpha (i,j) Calculating the wall thickness loss of each partition:
further, the neural network model basic framework used includes: the input layer has (n-1) x (n-1) neurons, the intermediate layer has (n-1) x (n-1) neurons, and the output layer has (n-1) x (n-1) neurons; the data adopted by the neural network model training is obtained by finite element numerical simulation calculation.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the technical solutions according to the embodiments of the present invention.
Claims (4)
1. The corrosion monitoring sensor based on the array four-probe potential drop technology is characterized by comprising a corrosion sensitive element, a temperature compensation element, a test probe, a PCB (printed circuit board), a sensor shell, a wiring terminal and a multi-core shielding wire;
the corrosion sensitive element and the temperature compensation element are positioned at the bottom of the sensor shell, the corrosion sensitive element is positioned at the center of the bottom surface of the sensor shell, and the temperature compensation element is positioned at the side surface of the corrosion sensitive element;
the corrosion sensing element and the temperature compensation element are respectively provided with the test probes, the corrosion sensing element and the temperature compensation element are electrically connected with the test probes, the top of the test probes is fixedly arranged on the PCB, the multi-core shielding wire is electrically connected with the PCB through the wiring terminals, the multi-core shielding wire comprises a plurality of wires, and the wires are electrically connected with the test probes in a one-to-one correspondence manner; epoxy resin pouring sealant is filled in the sensor shell;
the corrosion monitoring sensor based on the array four-probe potential drop technology is used for a corrosion depth measuring device based on the array four-probe potential drop technology and comprises a corrosion monitoring sensor based on the array four-probe potential drop technology, a multi-channel switching device, a high-precision voltmeter, a constant current source and a computer, wherein the multi-channel switching device is connected with the corrosion monitoring sensor through a multi-core shielding wire, the high-precision voltmeter and the constant current source are connected with the multi-channel switching device, the high-precision voltmeter is connected to 2 test probes on one side of a corrosion sensitive element measuring area and two test probes on the inner side of a temperature compensating element through the multi-channel switching device, and the constant current source is connected to 2 test probes on the other side of the corrosion sensitive element measuring area and two test probes on the outer side of the temperature compensating element through the multi-channel switching device;
the computer is respectively connected with the high-precision voltmeter, the constant current source and the multi-channel switching device and used for controlling the constant current source to provide current for the measuring area or the temperature compensation element through the multi-channel switching device and measuring voltage data through the high-precision voltmeter; the computer is also used for controlling the multi-channel switching device to sequentially select (n-1) x (n-1) measuring areas on the corrosion sensitive element to measure voltage data;
the high-precision voltmeter measures the voltage data of each measuring area and the temperature compensation element and transmits the voltage data to the computer, and the computer calculates the wall thickness loss of different measuring areas on the corrosion sensitive element according to the voltage data of the corrosion sensitive element measuring areas and the temperature compensation element;
the core part of the multi-channel switching device is provided with two groups of switch matrixes, and each group of switch matrixes consists of 2n 2 The switch is composed of switches, wherein the default state of all the switches is in an off state, one group is a current switch matrix and is used for selecting two test probes connected with the constant current source in a selected measurement area, and the other group is a voltage switch matrix and is used for selecting two test probes connected with the high-precision voltmeter in the selected measurement area;
the measuring and analyzing method based on the array four-probe potential drop technology of the corrosion depth measuring device based on the array four-probe potential drop technology comprises the following steps:
s01: installing a corrosion monitoring sensor based on an array four-probe potential drop technology: cleaning the surface of the corrosion monitoring sensor by using alcohol, drying by using cold air, placing the corrosion monitoring sensor in a region to be monitored, and connecting the multi-core shielding wire into a multi-channel switching device;
s02: selecting a corrosion sensitive element measuring area through a multi-channel switching device;
s03: controlling a constant current source to output excitation current;
s04: controlling the high-precision voltmeter to measure voltage data;
s05: repeating the steps S02-S04 until the voltage data of the temperature compensation element and all corrosion sensitive element measuring areas are measured;
s06: calculating partition coefficient alpha of each measurement area according to the measured voltage data (i,j) Calculating the wall thickness loss delta T of each measuring area through a neural network algorithm (i,j) Drawing a depth cloud image;
the calculation of the wall thickness loss of each measurement region from the measured voltage data specifically comprises the steps of:
the partition coefficient alpha of each measurement area is calculated according to the following method (i,j) ：
Wherein T is 0 To corrode the original thickness of the sensitive element, U (i,j) * For voltage data of corrosion sensitive element measuring area [ i, j ] after corrosion occurs, U (i,j) Is the voltage data of the corrosion sensitive element measuring area [ i, j ] in the original state, U ref * For voltage data of temperature compensation element after corrosion occurs, U ref Voltage data of the temperature compensation element in an original state;
wall thickness loss ΔT due to each measurement region (i,j) Partition coefficient alpha with each measurement region (i,j) A nonlinear mapping relation exists between the two coefficients, and a neural network model is used for measuring the partition coefficientsα (i,j) Calculating the wall thickness loss of each partition:
2. the corrosion monitoring sensor based on the array four-probe potential drop technique of claim 1, wherein the corrosion sensitive element is the same material as the temperature compensation element; and the bottom of the temperature compensation element is sprayed with chromium oxide ceramic.
3. The corrosion monitoring sensor based on the array four-probe potential drop technique of claim 1, wherein the bottom surface of the corrosion sensitive element is square; the bottom surface of the temperature compensation element is rectangular, and the length of the long side of the bottom surface of the temperature compensation element is the same as the square side length of the bottom surface of the corrosion sensitive element.
4. The corrosion monitoring sensor based on the array four-probe potential drop technology according to claim 1, wherein n×n test probes are connected to the corrosion sensing element, n×n test probes are arranged in a square array, the distances between adjacent test probes are equal, the corrosion sensing element is divided into (n-1) x (n-1) measurement areas, and each measurement area comprises four adjacent test probes in a square arrangement; the temperature compensation element is connected with 4 test probes, and the 4 test probes are positioned on the same straight line and distributed at equal intervals.
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