A pipeline inner wall corrosion monitoring system based on radio frequency identification sensing

Abstract

The application discloses a pipeline inner wall corrosion monitoring system based on radio frequency identification sensing, and relates to the technical field of pipeline monitoring.The pipeline inner wall corrosion monitoring system comprises a magnetizing device, an RFID label sensor and a reader-writer.The magnetizing device is arranged on a measured pipeline and comprises an iron core, a first permanent magnet, a first iron block, a second permanent magnet and a second iron block.The RFID label sensor is arranged on the measured pipeline and is located at the same side of the magnetizing device.The reader-writer is wirelessly connected with the RFID label sensor through a reader-writer antenna.The pipeline inner wall corrosion monitoring system has the advantages of light structure, low cost, high monitoring precision, easy installation and dismounting, convenient maintenance, contribution to the application of the pipeline inner wall corrosion monitoring technology and great engineering application value.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline monitoring, and particularly relates to a pipeline inner wall corrosion monitoring system based on radio frequency identification sensing. BACKGROUND

[0002] As an important basic pressure-bearing component, pipelines are widely used in long-distance transportation of oil and natural gas, and are lifelines of the national economy. The quality of the pipelines is the basis for ensuring safe transportation. However, due to stress, electrochemical degradation, vibration, external impact and other reasons, defects such as corrosion, loss, cavitation and cracks are prone to occur on the inner wall of the pipeline. If not found in time, the use performance in the later period will be reduced, and even serious safety accidents will be caused. In order to ensure the quality of the pipeline, various automatic non-destructive testing methods are usually used for quality detection, such as magnetic flux leakage, ultrasonic guided wave, optical fiber sensor, eddy current, infrared thermal imaging and the like. Although these methods can effectively monitor the pipeline corrosion, the above methods have the problems of expensive instruments and large structures, which are not conducive to monitoring most pipelines in harsh and extreme natural environments. In addition, regular detection is required, and complex instruments and cables are required, which is high in cost and is not suitable for large-scale monitoring.

[0003] As a non-contact identification technology, radio frequency identification technology has the advantages of passive wireless and maintenance-free. This technology can overcome the problems of the above pipeline monitoring methods, such as the need for regular maintenance, large structure and high cost. However, due to the skin effect, the existing radio frequency identification for pipeline corrosion detection is mainly applied to the monitoring of the outer surface corrosion of the pipeline, and cannot be applied to the internal corrosion of the pipeline. Therefore, it is urgent to develop a technical means that can solve the problem of pipeline inner wall corrosion monitoring. SUMMARY

[0004] In view of the above problems in the prior art, the pipeline inner wall corrosion monitoring system based on radio frequency identification sensing provided by the present application solves the problem that the existing pipeline monitoring technology cannot realize a light structure, low cost, high precision, easy installation and disassembly.

[0005] In order to achieve the above-mentioned application purposes, the technical scheme adopted by the present application is as follows:

[0006] A pipeline inner wall corrosion monitoring system based on radio frequency identification sensing, comprising: a magnetizing device, an RFID tag sensor and a reader-writer.

[0007] The magnetization device is arranged on the measured pipeline and comprises a core, a first permanent magnet, a first iron block, a second permanent magnet and a second iron block; the first iron block and the second iron block are arranged on the outer wall of the measured pipeline; the first permanent magnet is located above the first iron block and is fixedly connected with the first iron block; the second permanent magnet is located above the second iron block and is fixedly connected with the second iron block; the core is located above the first permanent magnet and the second permanent magnet, one end of the core is fixedly connected with the first permanent magnet, and the other end of the core is fixedly connected with the second permanent magnet;

[0008] The RFID tag sensor is arranged on the measured pipeline and is located at the same side as the magnetization device.

[0009] The reader is wirelessly connected with the RFID tag sensor through a reader antenna.

[0010] Further, the RFID tag sensor comprises an ultrahigh frequency RFID chip and a magnetic sensitive patch antenna.

[0011] The magnetic sensitive patch antenna comprises a metal ground plate, a dielectric substrate and a metal radiation patch; one surface of the dielectric substrate is fixedly connected with the metal ground plate, and the other surface of the dielectric substrate is fixedly connected with the metal radiation patch; a microstrip structure is arranged in the middle of the metal radiation patch, and one end of the microstrip structure is fixedly connected with the ultrahigh frequency RFID chip.

[0012] Further, the RFID tag sensor is arranged on the measured pipeline in a manner of adhesion, and the length direction of the magnetic sensitive patch antenna is perpendicular to the magnetization direction of the magnetization device.

[0013] Further, the dielectric substrate adopts FR-4 material.

[0014] Further, the impedance of the magnetic sensitive patch antenna is conjugate with the impedance of the ultrahigh frequency RFID chip.

[0015] The present application has the following advantages:

[0016] 1) The magnetization device provided by the present application is arranged on the measured pipeline and forms a complete magnetic circuit with the measured pipeline to magnetize the measured pipeline. In this environment, when there is corrosion on the inner wall of the measured pipeline, the internal corrosion will cause the distortion of the magnetic field, and then cause the disturbance of the surface permeability. The RFID tag sensor arranged on the measured pipeline detects the disturbance of the surface permeability of the measured pipeline to monitor the corrosion state of the inner wall of the pipeline, and transmits the wireless signal to the reader to interact the data. Compared with the prior art, the present application has the advantages of light structure, low cost, high monitoring precision, easy installation and disassembly, convenient maintenance, contribution to the application of the pipeline inner wall corrosion monitoring technology and great engineering application value.

[0017] 2) The magnetic sensitive patch antenna of the RFID tag sensor, when pasted on the measured pipeline, the metal grounding plate is in full contact with the surface of the pipeline, so that the surface of the pipeline serves as the grounding surface of the antenna to monitor the magnetic permeability distortion caused by the corrosion of the inner wall of the pipeline, the metal radiation patch on the other side of the dielectric substrate converts the disturbance of the magnetic permeability into the shift of the resonant frequency of the antenna through the microstrip structure, the resonant frequency shift RFS increases with the increase of the corrosion depth of the inner wall of the measured pipeline, and the corrosion monitoring of the inner wall of the pipeline is realized.

[0018] 3) The impedance of the magnetic sensitive patch antenna is conjugated with the impedance of the ultra-high frequency RFID chip, so that the impedance matching of the magnetic sensitive patch antenna and the ultra-high frequency RFID chip is realized, and the signal transmission quality is good. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A structure diagram of a pipeline inner wall corrosion monitoring system based on radio frequency identification sensing provided by the embodiment of the present application;

[0020] Figure 2 A structure diagram of the RFID tag sensor of the embodiment of the present application;

[0021] Figure 3 A scale annotation diagram of the RFID tag sensor of the embodiment of the present application;

[0022] Among them, the reference signs are: 1, magnetizing device; 2, RFID tag sensor; 3, measured pipeline; 4, reader-writer; 11, iron core; 12, first permanent magnet; 13, first iron block; 14, second permanent magnet; 15, second iron block; 21, metal grounding plate; 22, dielectric substrate; 23, metal radiation patch; 24, ultra-high frequency RFID chip; 41, reader-writer antenna. DETAILED DESCRIPTION

[0023] The specific embodiments of the present application are described below, so that those skilled in the art can understand the present application, but it should be clear that the present application is not limited to the scope of the specific embodiments, and for those skilled in the art, it is obvious that various changes are within the spirit and scope of the present application defined and determined by the appended claims, and all the inventions utilizing the concept of the present application are within the scope of protection.

[0024] As Figure 1 shown, in one embodiment of the present application, a pipeline inner wall corrosion monitoring system based on radio frequency identification sensing includes a magnetizing device 1, an RFID tag sensor 2 and a reader-writer 4.

[0025] The magnetization device 1 is arranged on the measured pipeline 3, and comprises a core 11, a first permanent magnet 12, a first iron block 13, a second permanent magnet 14 and a second iron block 15; the first iron block 13 and the second iron block 15 are arranged on the outer wall of the measured pipeline 3. The first permanent magnet 12 is located above the first iron block 13 and is fixedly connected with the first iron block 13; the second permanent magnet 14 is located above the second iron block 15 and is fixedly connected with the second iron block 15; the core 11 is located above the first permanent magnet 12 and the second permanent magnet 14, one end of the core 11 is fixedly connected with the first permanent magnet 12, and the other end of the core 11 is fixedly connected with the second permanent magnet 14.

[0026] The RFID tag sensor 2 is arranged on the measured pipeline 3 in a manner of adhesion and is located on the same side as the magnetization device 1, as shown in the figure, and comprises an ultra-high frequency RFID chip 24 and a magnetic sensitive patch antenna. Figure 2 The magnetic sensitive patch antenna comprises a metal ground plate 21, a dielectric substrate 22 and a metal radiation patch 23. The dielectric substrate 22 is made of FR-4 material, one surface of the dielectric substrate 22 is fixedly connected with the metal ground plate 21, and the other surface of the dielectric substrate 22 is fixedly connected with the metal radiation patch 23; the metal radiation patch 23 is provided with a microstrip structure in the middle, and one end of the microstrip structure is fixedly connected with the ultra-high frequency RFID chip 24. The length direction of the magnetic sensitive patch antenna is perpendicular to the magnetization direction of the magnetization device 1, and the impedance of the magnetic sensitive patch antenna is conjugate with the impedance of the ultra-high frequency RFID chip 24.

[0027] The reader 4 is wirelessly connected with the RFID tag sensor 2 through a reader antenna 41.

[0028] The magnetization device 1 provided by the embodiment is arranged on the measured pipeline 3 and forms a complete magnetic circuit with the measured pipeline 3, so that the measured pipeline 3 is magnetized. In this environment, when there is corrosion on the inner wall of the measured pipeline 3, the internal corrosion will cause the magnetic field to be distorted, and then cause the disturbance of the surface permeability. The RFID tag sensor 2 arranged on the measured pipeline 3 detects the disturbance of the surface permeability of the measured pipeline 3, monitors the corrosion state of the inner wall of the pipeline, and transmits the corrosion state to the reader 4 through a wireless signal for data interaction.

[0029] The scientific principle on which the present application is based is as follows:

[0030] According to the skin effect, the current loss in the measured pipeline 3 is concentrated in the skin depth:

[0031]

[0032] Wherein μ is the magnetic permeability, σ is the electrical conductivity, and f is the frequency. Therefore, the resonance frequency offset of the magnetic sensitive patch antenna of the RFID tag sensor 2 can reflect the change of the material performance around the region where the surface crack and internal corrosion of the measured pipeline 3 are located.

[0033] The resonance frequency f of the RFID tag sensor 2 res The expression is as follows:

[0034]

[0035]

[0036]

[0037] Wherein, c represents the speed of light, ε re represents the effective dielectric constant, L represents the length of the metal radiation patch 23, ΔL oc represents the compensation length, ε r represents the dielectric constant, h represents the thickness of the dielectric substrate 22, and W represents the width of the metal radiation patch 23.

[0038] When there is corrosion inside the measured pipeline 3 material, the metal and air will disturb the magnetic field distribution due to the difference in material properties. After being squeezed, part of the magnetic lines pass through the space above the corrosion, and the other part leaks into the air on the other side of the corrosion. According to the magnetic field distribution law, the magnetic field strength H above the corrosion is strengthened. The change of the magnetic field corresponds to different positions of the μ-H curve of the ferromagnetic material, so the non-uniform distribution of the magnetic field caused by the corrosion of the inner wall of the pipeline will cause the disturbance of the permeability of the pipeline surface, thereby converting the internal corrosion into a magnetic permeability disturbance that can be monitored by the RFID tag sensor 2 sensitive to magnetic permeability.

[0039] In order to ensure the anti-metal property of the magnetic sensitive patch antenna, a microstrip structure is adopted, which is placed on the outer surface of the measured pipeline during operation, and the surface of the pipeline is used as the ground plane of the magnetic sensitive patch antenna to monitor the magnetic permeability distortion caused by the corrosion of the inner wall of the pipeline.

[0040] The magnetic field disturbance caused by the internal corrosion of the measured pipeline 3 in the magnetized state will cause the disturbance of the surface magnetic permeability. Under the same magnetization intensity, the magnetic permeability of the pipeline surface area corresponding to the internal corrosion increases with the increase of the corrosion burial depth, and the disturbance of the magnetic permeability can be represented by the resonance frequency or the resonance frequency shift RFS of the antenna, which increases with the increase of the corrosion depth of the inner wall of the measured pipe. Due to the squeezing effect of the magnetic force lines caused by the defect, the magnetic field intensity in the skin depth layer of the pipeline appears to be larger, especially the magnetic field intensity in the area directly opposite the crack defect is the largest. In addition, the shallower the burial depth, the greater the change of the magnetic field.

[0041] The magnetic sensitive patch antenna is designed for the ultra-high frequency band, which converts the corrosion of the inner wall of the pipeline into a magnetic permeability disturbance that can be detected by the ultra-high frequency RFID chip 24. The specific size (size opinion Figure 3 ) of the design is shown in Table 1:

[0042] Table 1 (mm)

[0043] L W [[ L i ]]> [WC i ]]> [[ L c ]]> [WC h ]]> 69 47 41 9 21.3 2

[0044] The impedance of the magnetic sensitive patch antenna is conjugate to the impedance of the ultra-high frequency radio frequency identification chip, so as to realize impedance matching between the magnetic sensitive patch antenna and the ultra-high frequency radio frequency identification chip, and make signal transmission quality good.

[0045] Compared with the prior art, the application has the advantages of light structure, low cost, high monitoring precision, easy installation and dismounting, convenient maintenance, passive wireless and maintenance-free RFID tag sensor, saving manpower and material resources, and great engineering application value.

[0046] The principles and implementation manners of the present application are described by using specific embodiments, and the above embodiment descriptions are only used for helping to understand the method and core idea of the present application; meanwhile, for the ordinary skilled in the art, the specific implementation manners and application ranges can be changed according to the idea of the present application, and the content of the specification should not be understood as the limitation of the present application.

[0047] Those skilled in the art will understand that the embodiments described herein are for the purpose of helping the reader to understand the principles of the present application, and should be understood as the protection scope of the present application not being limited to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations according to the technical inspirations disclosed in the present application without departing from the essence of the present application, and these modifications and combinations still fall within the protection scope of the present application.

Claims

1. A pipeline inner wall corrosion monitoring system based on radio frequency identification (RFID) sensing, characterized in that, The application relates to a magnetization device (1), an RFID tag sensor (2) and a reader-writer (4). The magnetization device (1) is arranged on a measured pipeline (3) and comprises an iron core (11), a first permanent magnet (12), a first iron block (13), a second permanent magnet (14) and a second iron block (15); the first iron block (13) and the second iron block (15) are arranged on the outer wall of the measured pipeline (3); the first permanent magnet (12) is arranged above the first iron block (13) and is fixedly connected with the first iron block (13); the second permanent magnet (14) is arranged above the second iron block (15) and is fixedly connected with the second iron block (15); the iron core (11) is arranged above the first permanent magnet (12) and the second permanent magnet (14), one end of the iron core (11) is fixedly connected with the first permanent magnet (12), and the other end of the iron core (11) is fixedly connected with the second permanent magnet (14). The RFID tag sensor (2) is arranged on the measured pipeline (3) and is located on the same side as the magnetization device (1); the RFID tag sensor (2) comprises an ultrahigh-frequency RFID chip (24) and a magnetic sensitive patch antenna. The magnetic sensitive patch antenna comprises a metal grounding plate (21), a dielectric substrate (22) and a metal radiation patch (23); one surface of the dielectric substrate (22) is fixedly connected with the metal grounding plate (21), and the other surface of the dielectric substrate (22) is fixedly connected with the metal radiation patch (23); a microstrip structure is arranged in the middle of the metal radiation patch (23); one end of the microstrip structure is fixedly connected with the ultrahigh-frequency RFID chip (24); the RFID tag sensor (2) is arranged on the measured pipeline (3) in a bonding mode; the length direction of the magnetic sensitive patch antenna is perpendicular to the magnetization direction of the magnetization device (1); and the impedance of the magnetic sensitive patch antenna is conjugated with the impedance of the ultrahigh-frequency RFID chip (24). The reader-writer (4) is wirelessly connected with the RFID tag sensor (2) through a reader-writer antenna (41). The dielectric substrate (22) is made of FR-4 material.

2. The RFID sensor based in-pipe wall corrosion monitoring system of claim 1, wherein, ​

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