Nickel powder variable-size electrode electrical capacitance tomography sensor

Abstract

The invention discloses a nickel powder variable-size electrode electrical capacitance tomography sensor, which relates to the technical field of sensor design, and comprises an acrylic acid isolation layer, a fixed mounting frame, a powder electrode storage device, a soft magnetic sheet recovery device and a nickel metal powder electrode array, a plurality of measuring rods are uniformly arranged on the circumferential outer side of the fixed mounting frame in a surrounding and penetrating manner, a powder electrode storage device and a soft magnetic sheet recovery device located on one side of the powder electrode storage device are sequentially arranged at the ends, close to the acrylic acid isolation layer, of the measuring rods, and the powder electrode storage device is located on the circumferential outer side of the acrylic acid isolation layer; the adjacent measuring rods are connected through a soft magnetic sheet, and an attaching rod is arranged on the outer side of the soft magnetic sheet; and the nickel metal powder electrode array comprises a plurality of measuring electrodes which are uniformly arranged around the circumference of the object to be measured. According to the nickel powder variable-size electrode electrical capacitance tomography sensor, the powder electrode with any width can be flexibly selected so as to adapt to pipelines to be imaged with different perimeters.

Description

Technical Field

[0001] The invention relates to the technical field of sensor design, and in particular to a nickel powder variable-size electrode capacitance tomography sensor. Background Art

[0002] Electrical Capacitance Tomography (ECT) is a process imaging technology that uses the principle of capacitance sensitivity. It collects projection data (i.e., capacitance values) of non-conductive materials at different viewing angles by installing a set of specially designed capacitance sensor arrays around the boundary of the imaging area (such as the outer wall of a pipe or a closed container). These data reflect the distribution of the dielectric constant of the internal medium. Based on the sensitivity characteristics of the sensor and the selected reconstruction algorithm, the ECT system can display the medium distribution in the form of an image, thereby achieving non-contact visualization of the dielectric properties inside structures of arbitrary shapes.

[0003] ECT technology has the advantages of non-invasiveness, rapid response, high cost-effectiveness, safety and no radiation, so it is particularly suitable for the detection of two-phase or multi-phase fluids, and has been applied in many fields, including but not limited to: monitoring the temperature distribution in the skull model, the moisture content of stored grain, the characteristics of frozen soil, the thickness of lubricating oil film in sliding bearings, etc. This technology spans multiple industries such as petroleum, chemical industry, electricity, metallurgy, building materials and even medicine, showing a wide range of application prospects and potential.

[0004] In a two-dimensional ECT configuration, the electrode array is usually arranged along the periphery of a circular or rectangular cross-section pipe, containing n electrodes, each of which forms a unique capacitance pair with the other n-1 electrodes, resulting in a total of m=n*(n-1) / 2 independent capacitance measurements. These capacitances are closely related to the dielectric constant distribution of the medium in the pipe. By establishing a mathematical model of the sensing characteristics in the pipe, the relationship between the dielectric constant and the capacitance can be determined - the so-called sensitive field S. Subsequently, with the help of the sensitive field information and a specific inversion algorithm, the spatial distribution of the dielectric constant inside the pipe can be reconstructed from the m capacitance measurements.

[0005] Regarding the practical application of ECT sensors, Chinese patent CN104858813A discloses a parameter-adjustable ECT sensor fixture device, which includes a rotary joint, a rod, a clamping slider, a flat-head screw, a positioning card, a bolt, a "T"-shaped rotating piece, a hexagonal nut, a plate block, an angle positioning buckle, an L-shaped support rod, a support slider and other components. This design is intended to meet the measurement needs of cylindrical pipes of different diameters, but its structure is relatively complex, the adjustment process is cumbersome, and the electrode width cannot be adjusted to maintain the optimal electrode aspect ratio when the pipe diameter is changed, affecting the measurement accuracy. On the other hand, Chinese patent CN116380998A discloses a detachable variable-diameter capacitance tomography sensor, which adopts a design of overlapping electrodes combined with a fabric structure, so that it can fit the object to be measured during the installation process, and can maintain the optimal electrode aspect ratio by stretching the overlapping electrodes, so as to achieve accurate measurement of objects of different diameters; however, due to the certain thickness of the overlapping electrode part, it will have a certain impact on the measurement results.

[0006] Currently, no effective solution has been proposed for the problems in the related technologies. Summary of the invention

[0007] In view of the problems in the related art, the present invention proposes a nickel powder variable-size electrode capacitance tomography sensor to overcome the above technical problems existing in the existing related art.

[0008] To this end, the specific technical solution adopted by the present invention is as follows: A nickel powder variable-size electrode capacitance tomography sensor comprises an acrylic isolation layer, a fixed installation frame, a powder electrode storage device, a soft magnetic sheet recovery device and a nickel metal powder electrode array; wherein the acrylic isolation layer surrounds the circumferential surface of the object to be measured and forms a pipeline structure; the fixed installation frame surrounds the outer side of the circumference of the acrylic isolation layer and is a frame ring structure that can be opened and closed and engraved with scales; a plurality of measuring rods are evenly arranged around and interspersed around the outer side of the circumference of the fixed installation frame, and a powder electrode storage device and a soft magnetic sheet recovery device located on one side of the powder electrode storage device are sequentially arranged at one end of the measuring rod close to the acrylic isolation layer, and the powder electrode storage device is located outside the circumference of the acrylic isolation layer; adjacent measuring rods are connected by soft magnetic sheets, and a fitting rod is arranged on the outer side of the soft magnetic sheets; the nickel metal powder electrode array comprises a plurality of measuring electrodes evenly arranged around the circumference of the object to be measured.

[0009] Furthermore, in order to flatten the powder electrode to form a plane of uniform thickness when subjected to force, the acrylic isolation layer includes a test object layer and a soft magnetic sheet layer. The test object layer is the inner wall of the acrylic isolation layer, and the soft magnetic sheet layer is the outer wall of the acrylic isolation layer. A copper sheet is embedded on the circumferential outer side of the soft magnetic sheet layer, and the copper sheet is connected to the shielding wire. The material of the test object layer and the soft magnetic sheet layer is synthetic polymer acrylate.

[0010] Furthermore, in order to ensure that the widths between multiple powder electrodes are equal and improve the stability of the sensor body, the fixed installation frame includes a main frame ring symmetrically arranged at the top and bottom of the outer side of the acrylic isolation layer and an auxiliary frame ring arranged in the middle of the outer side of the acrylic isolation layer; a plurality of evenly arranged main sliding components are arranged on the outer side of the circumference of the main frame ring; and a plurality of evenly arranged auxiliary sliding components are arranged on the outer side of the circumference of the auxiliary frame ring.

[0011] Furthermore, in order to be able to adjust the sensor circumference size according to the size of the object to be measured and achieve high-precision imaging of objects of different sizes, the measuring rod includes a main measuring rod inserted into the main sliding component and an auxiliary measuring rod inserted into the auxiliary sliding component, and one end of the main measuring rod is connected to the powder electrode storage device, and one end of the auxiliary measuring rod is connected to the bonding rod.

[0012] Furthermore, in order to enable the measuring powder electrode to fit tightly to the object to be measured, the powder electrode storage device includes a powder electrode storage bottom box and a push cover, and the powder electrode storage bottom box and the push cover are connected by a spring, and a powder electrode soft magnetic strip entrance and a powder electrode soft magnetic strip exit are respectively opened on both sides of the powder electrode storage bottom box, and the powder electrode soft magnetic strip entrance and the powder electrode soft magnetic strip exit are both gap structures, and the height of the powder electrode soft magnetic strip exit is greater than the width of the powder electrode soft magnetic strip entrance.

[0013] Furthermore, in order to make the powder layer flat and uniform in thickness and ensure the possibility of accurate measurement of nickel metal powder as an electrode, a vortex spring connected to the soft magnetic sheet is arranged inside the soft magnetic sheet recovery device, and the other side of the vortex spring cooperates with the outlet of the powder electrode soft magnetic strip.

[0014] The beneficial effects of the present invention are: 1. The present invention uses a nickel powder variable-size electrode capacitance tomography sensor, which can flexibly select powder electrodes of any width to adapt to pipelines of different circumferences to be imaged. The sensor uses a fixed installation frame to ensure that the angle of the main measuring rod is fixed, thereby ensuring that the widths between multiple powder electrodes are equal and the electrode gap ratio remains unchanged; the powder electrode soft magnetic strip outlet ensures that the thickness of the pulled powder electrode is consistent, and combined with the function of the soft magnetic sheet recovery device, the measuring powder electrode can fit closely to the object to be measured.

[0015] 2. The present invention achieves high-precision imaging of objects of different sizes by uniformly adsorbing nickel metal powder electrodes on a soft magnetic sheet and closely contacting the object to be measured, and adjusting the circumference of the sensor according to the size of the object to be measured; the width of the nickel powder electrode is controlled by adjusting the pull-out length of the soft magnetic sheet, thereby achieving artificial variability of the electrode gap ratio. When the electrode gap ratio is determined, the electrode gap ratio of the electrode array is ensured to remain unchanged, which not only improves the imaging accuracy, but also enhances the flexibility of adjustment, so that the sensor can quickly switch between objects of different sizes to be measured.

[0016] 3. The present invention makes the measurement range of the nickel powder variable size electrode capacitance tomography sensor more flexible by adjusting the width of the powder electrode. When there is sufficient nickel powder and soft magnetic sheet in the box, any size can be adjusted, which not only improves the adaptability of the measurement, but also greatly reduces the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 is a schematic structural diagram of a nickel powder variable-size electrode capacitance tomography sensor according to an embodiment of the present invention; Figure 2 This is one of the partial structural schematic diagrams of a nickel powder variable-size electrode capacitance tomography sensor according to an embodiment of the present invention; Figure 3 yes Figure 2 A partial enlarged view of the middle A; Figure 4 This is a second partial structural schematic diagram of a nickel powder variable-size electrode capacitance tomography sensor according to an embodiment of the present invention; Figure 5 This is a third partial structural schematic diagram of a nickel powder variable-size electrode capacitance tomography sensor according to an embodiment of the present invention; Figure 6 It is a partial structural schematic diagram of a powder electrode storage device in a nickel powder variable-size electrode capacitance tomography sensor according to an embodiment of the present invention; Figure 7 2 is a schematic diagram of the structure of a volute spring in a nickel powder variable-size electrode capacitance tomography sensor according to an embodiment of the present invention; Figure 8 The present invention is a schematic structural diagram of an acrylic isolation layer in a nickel powder variable-size electrode capacitance tomography sensor according to an embodiment of the present invention.

[0019] In the figure: 1. Acrylic isolation layer; 101. Object layer to be measured; 102. Soft magnetic sheet layer; 2. Fixed installation frame; 201. Main frame ring; 202. Auxiliary frame ring; 203. Main sliding part; 204. Auxiliary sliding part; 3. Powder electrode storage device; 301. Powder electrode storage bottom box; 3011. Powder electrode soft magnetic strip inlet; 3012. Powder electrode soft magnetic strip outlet; 302. Push cover; 4. Soft magnetic sheet recovery device; 5. Nickel metal powder electrode array; 6. Measuring rod; 601. Main measuring rod; 602. Auxiliary measuring rod; 7. Soft magnetic sheet; 8. Laminating rod; 9. Shielding wire; 10. Vortex spring. DETAILED DESCRIPTION

[0020] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments. They can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. By referring to these contents, ordinary technicians in this field should be able to understand other possible implementation methods and advantages of the present invention.

[0021] According to an embodiment of the present invention, a nickel powder variable-size electrode capacitance tomography sensor is provided.

[0022] The present invention is further described with reference to the accompanying drawings and specific embodiments. Figure 1-Figure 8 As shown, the nickel powder variable-size electrode capacitance tomography sensor according to an embodiment of the present invention includes an acrylic isolation layer 1, a fixed installation frame 2, a powder electrode storage device 3, a soft magnetic sheet recovery device 4 and a nickel metal powder electrode array 5; wherein the acrylic isolation layer 1 surrounds the circumferential surface of the object to be measured and forms a pipeline structure; the fixed installation frame 2 surrounds the outer side of the circumference of the acrylic isolation layer 1, and is a frame ring structure that can be opened and closed and engraved with scales; a number of measuring rods 6 are evenly arranged around and interspersed around the outer side of the circumference of the fixed installation frame 2, and a powder electrode storage device 3 and a soft magnetic sheet recovery device 4 located on one side of the powder electrode storage device 3 are sequentially arranged at one end of the measuring rod 6 close to the acrylic isolation layer 1, and the powder electrode storage device 3 is located outside the circumference of the acrylic isolation layer 1; adjacent measuring rods 6 are connected by soft magnetic sheets 7, and a bonding rod 8 is arranged on the outer side of the soft magnetic sheet 7; the nickel metal powder electrode array 5 includes a number of measuring electrodes evenly arranged around the circumference of the object to be measured.

[0023] It should be noted that the measuring electrode is made of high-purity conductive nickel powder, which is magnetic and has the second-class specification of 40-75um.

[0024] By means of the above technical scheme of the present invention, through the nickel powder variable size electrode capacitance tomography sensor, powder electrodes of any width can be flexibly selected to adapt to pipelines to be imaged with different circumferences. The sensor uses a fixed mounting frame 2 to ensure that the angle of the main measuring rod 601 is fixed, thereby ensuring that the widths between multiple powder electrodes are equal, so that the electrode gap ratio remains unchanged. The nickel metal powder electrode is uniformly adsorbed on the soft magnetic sheet 7 and is close to the object to be measured. The sensor circumference size is adjusted according to its size to achieve high-precision imaging of objects of different sizes; the width of the nickel powder electrode is controlled by adjusting the pull-out length of the soft magnetic sheet 7, and the artificial variability of the electrode gap ratio is achieved. When the electrode gap ratio is determined, the electrode gap ratio of the electrode array is ensured to remain unchanged, which not only improves the imaging accuracy, but also enhances the flexibility of adjustment, so that the sensor can quickly switch between objects to be measured of different sizes. By adjusting the powder electrode width, the measurement range of the nickel powder variable size electrode capacitance tomography sensor is more flexible. When there are enough nickel powder and soft magnetic sheets 7 in the box, any size adjustment can be achieved, which not only improves the adaptability of measurement, but also greatly reduces the cost.

[0025] In one embodiment, for the above-mentioned acrylic isolation layer 1, the acrylic isolation layer 1 includes an object layer 101 to be measured and a soft magnetic layer 102, the object layer 101 to be measured is the inner wall of the acrylic isolation layer 1, and the soft magnetic layer 102 is the outer wall of the acrylic isolation layer 1, and a copper sheet is embedded on the circumferential outer side of the soft magnetic layer 102, and the copper sheet is connected to the shielding wire 9, and the material of the object layer 101 to be measured and the soft magnetic layer 102 is synthetic polymer acrylate, so that the powder electrode is flattened to form a plane of uniform thickness when subjected to force.

[0026] It should be noted that the acrylic isolation layer 1 is made of synthetic polymer acrylic ester, has excellent smoothness, and can be flattened when the powder electrode is subjected to force to form a plane with uniform thickness; the acrylic isolation layer 1 is divided into two parts: the object layer 101 to be measured and the soft magnetic layer 102; the object layer 101 to be measured is in close contact with the object to be measured to prevent the powder from directly contacting the object to be measured, while ensuring that when pressure is applied, the powder electrode can smoothly form an electrode layer with uniform thickness; the soft magnetic layer 102 is in close contact with the soft magnetic sheet 7. As a ferrite magnetic material, the soft magnetic sheet 7 may affect the accuracy of the electrode measurement if it is in direct contact with the metal powder. Therefore, the soft magnetic sheet 102 plays an isolating role, avoiding direct contact between the soft magnetic sheet 7 and the powder, thereby eliminating the influence of the soft magnetic sheet 7 (ferrite) material on the measurement result.

[0027] In addition, a thin copper sheet of 2 square centimeters is embedded in the middle of the soft magnetic sheet layer 102 on the side facing the powder electrode, and the copper sheet is connected to the shielding wire 9 used for detection.

[0028] When the soft magnetic sheet is pulled out by the spiral spring 10, the powder electrode is adsorbed, and the shielding wire 9 is connected to the capacitance tomography (EIT) signal acquisition system for transmitting data, thereby completing the data acquisition process of the capacitance tomography system.

[0029] In one embodiment, for the above-mentioned fixed installation frame 2, the fixed installation frame 2 includes a main frame ring 201 symmetrically arranged at the top and bottom of the outer circumference of the acrylic isolation layer 1 and an auxiliary frame ring 202 arranged in the middle of the outer circumference of the acrylic isolation layer 1; a plurality of evenly arranged main sliding parts 203 are arranged on the outer circumference of the main frame ring 201; a plurality of evenly arranged auxiliary sliding parts 204 are arranged on the outer circumference of the auxiliary frame ring 202, thereby ensuring that the widths of multiple powder electrodes are equal and improving the stability of the sensor body.

[0030] It should be supplemented that the fixed installation frame 2 is opened and closed by a latch, can be automatically installed, and has a fixed structure.

[0031] In one embodiment, for the above-mentioned measuring rod 6, the measuring rod 6 includes a main measuring rod 601 inserted into the main sliding component 203 and an auxiliary measuring rod 602 inserted into the auxiliary sliding component 204, and one end of the main measuring rod 601 is connected to the powder electrode storage device 3, and one end of the auxiliary measuring rod 602 is connected to the fitting rod 8, so that the sensor circumference size can be adjusted according to the size of the object to be measured, thereby realizing high-precision imaging of objects of different sizes.

[0032] It should be noted that the main measuring rod 601 and the auxiliary measuring rod 602 are used as axial long rods to fix the object to be measured, aiming to improve the stability of the sensor body; the main sliding component 203 and the auxiliary sliding component 204 are equipped with an automatic installation device, which includes a stepper motor and its driver, pulleys and other components; the fixed installation frame 2 is evenly distributed with N groups of modular measuring rods, each group of measuring rods consists of a main measuring rod 601 (A rod) and a relative main measuring rod 601 (B rod), and the A rod is equipped with a powder electrode storage device 3 and a soft magnetic sheet recovery device 4, which together with the B rod constitute a complete measuring electrode unit, forming a modular powder electrode unit.

[0033] This embodiment prefabricates N groups of powder electrode units, supporting a variety of commonly used electrode configurations such as 8 electrodes, 9 electrodes, 12 electrodes, 16 electrodes, and 32 electrodes. Users can select an appropriate number of electrode configurations as needed, so that the N groups of electrode units are evenly arranged around the object to be measured for precise measurement. During installation, first open the fixed installation frame 2, place the object to be measured therein, and after closing the frame, ensure that the object to be measured is located at the center by adjusting the scales on each measuring rod, and adjust the position of the measuring rod according to the scale angle on the frame ring to form an array of measuring electrodes of equal size. Since each powder electrode corresponds to the same arc angle, the distance between adjacent measuring powder electrodes remains consistent, thereby ensuring the consistency and accuracy of the measurement.

[0034] In one embodiment, for the above-mentioned powder electrode storage device 3, the powder electrode storage device 3 includes a powder electrode storage bottom box 301 and a push cover 302, and the powder electrode storage bottom box 301 and the push cover 302 are connected by a spring, and a powder electrode soft magnetic strip inlet 3011 and a powder electrode soft magnetic strip outlet 3012 are respectively opened on both sides of the powder electrode storage bottom box 301, and the powder electrode soft magnetic strip inlet 3011 and the powder electrode soft magnetic strip outlet 3012 are both gap structures, and the height of the powder electrode soft magnetic strip outlet 3012 is greater than the width of the powder electrode soft magnetic strip inlet 3011, so that the measured powder electrode can fit closely to the object to be measured.

[0035] It should be noted that gaps of different heights are designed on both sides of the powder electrode storage box 301: one side is a narrow slit powder electrode soft magnetic strip entrance 3011, whose height matches the thickness of the soft magnetic sheet 7 (1 mm), which is used for the entry of the soft magnetic sheet 7 and the recovery of nickel powder; the other side is a wide slit powder electrode soft magnetic strip exit 3012 (i.e., the powder outlet) that is about 3 mm higher than the powder electrode soft magnetic strip entrance 3011, to ensure that the soft magnetic sheet 7 can absorb powder electrodes of uniform thickness when being pulled out; in addition, the powder electrode storage box 301 is connected to the pushing cover 302 by a spring, and the pushing cover 302 is equipped with a concave handle to facilitate uniform force application to assist in the pushing and recovery operations of the powder electrode.

[0036] Gaps of different heights are left on both sides of the powder electrode storage box 301. The powder electrode soft magnetic strip entrance 3011 is a narrow gap, and its height is the same as the thickness of the soft magnetic sheet 7 (1 mm), which is used for the entry of the soft magnetic sheet 7 and the recovery of nickel powder. The powder electrode soft magnetic strip exit 3012 is about 3 mm higher than the powder electrode soft magnetic strip entrance 3011 (powder outlet) and is a wide gap. The height limit of the powder electrode soft magnetic strip exit 3012 allows the soft magnetic sheet to adsorb powder electrodes of uniform thickness when pulled out; in addition, the pushing cover 302 has a concave handle for uniform force, which assists in pushing and recovering the powder electrode.

[0037] In one embodiment, for the above-mentioned soft magnetic sheet recovery device 4, a spiral spring 10 connected to the soft magnetic sheet 7 is arranged inside the soft magnetic sheet recovery device 4, and the other side of the spiral spring 10 cooperates with the powder electrode soft magnetic strip outlet 3012, so that the powder layer becomes flat and has uniform thickness, ensuring the possibility of accurate measurement of nickel metal powder as an electrode.

[0038] It should be noted that the soft magnetic sheet recovery device 4 is fixed on the main measuring rod 601 and is located on the side of the powder electrode soft magnetic strip inlet 3011 of the powder electrode storage device 3. A spiral spring 10 is fixed inside the soft magnetic sheet recovery device 4. The soft magnetic sheets 7 form a soft magnetic sheet roll, one end of which is fixed on the spiral spring 10 in the soft magnetic sheet recovery device 4, and the other end passes through the powder electrode soft magnetic strip outlet 3012 of the powder electrode storage device 3 and is fixed on another opposite set of main measuring rods 601.

[0039] In addition, the soft magnetic sheet recovery device 4 uses the spiral spring 10 as a core component and is equipped with a stepper motor as an auxiliary power source. One end of the soft magnetic sheet 7 is fixed on the spiral spring 10, and the other end passes through the powder electrode soft magnetic strip outlet 3012 (i.e., the powder outlet) of the powder electrode storage device 3; when the soft magnetic sheet 7 is pulled out, the spiral spring 10 undergoes elastic deformation, and the elastic force generated is used to provide the pressure required for fixing the powder electrode, as well as the power for recovering the soft magnetic sheet 7; however, considering that the force generated by the spiral spring 10 itself may be uneven and unstable, a stepper motor is added as an auxiliary to ensure that the recovery process of the soft magnetic sheet 7 is smoother and more efficient.

[0040] For specific application scenarios, such as water plants and lumber yards, which require continuous measurement of a large number of indestructible objects of different sizes, traditional sensors often require separate measurement tools for different sizes, which is costly and complicated to operate. In contrast, nickel powder variable-size electrode capacitance tomography sensors are not only more convenient, but also significantly reduce manufacturing and use costs, making them particularly suitable for large-scale and diversified measurement needs.

[0041] In order to facilitate understanding of the above technical solutions of the present invention, the working principle or operation mode of the present invention in the actual process is described in detail below.

[0042] In actual application, first, loosen the opening and closing screws of the main frame ring 201 and the auxiliary frame ring 202, separate the two in half, evenly install the required number of main measuring rods 601, auxiliary measuring rods 602, powder electrode storage devices 3 and soft magnetic sheet recovery devices 4 at the specified angle, and fix one end of the soft magnetic roll composed of soft magnetic sheets 7 on the volute spring 10, and the other end passes through the powder electrode storage device 3 and is fixed on the main measuring rod 601. In addition, the soft magnetic sheet 7 is laid under the sensor to collect the nickel powder electrode scattered during the operation; then, use the acrylic isolation layer 1 to wrap the object to be measured, and use self-locking nylon cable ties to tie it up and down to ensure its stability; then, place the wrapped object to be measured in the middle of the main frame ring 201 and the auxiliary frame ring 202, close and lock the frame, and adjust the main measuring rod 6 at the same time. 01 and the auxiliary measuring rod 602, so that the object to be measured is in the central position, which improves the stability during measurement; next, start the stepper motor to drive the main sliding part 203 that cooperates with the main measuring rod 601, so that the soft magnetic sheet 7 on the main measuring rod 601 extends out and adsorbs the nickel powder electrode. At this time, the vortex spring 10 generates elastic potential energy due to deformation, which helps to stabilize and fix the powder electrode; when the nickel powder passes through the gap, although it will form a uniform wavy distribution, the elastic potential energy of the vortex spring 10 prompts the soft magnetic sheet 7 to be close to the acrylic isolation layer 1, so that the powder layer becomes flat and the thickness is uniform, ensuring the possibility of accurate measurement of nickel metal powder as an electrode; finally, after completing the arrangement of all soft magnetic sheets 7, connect the shielding line 9 to the computer, transmit the capacitance data and process the image through the algorithm, so as to provide accurate data support for subsequent analysis.

[0043] In summary, by means of the above technical solution of the present invention, through the nickel powder variable size electrode capacitance tomography sensor, powder electrodes of any width can be flexibly selected to adapt to pipelines to be imaged with different circumferences. The sensor uses a fixed mounting frame 2 to ensure that the angle of the main measuring rod 601 is fixed, thereby ensuring that the widths between multiple powder electrodes are equal, so that the electrode gap ratio remains unchanged; the powder electrode soft magnetic strip outlet 3012 ensures that the thickness of the pulled powder electrode is consistent, and combined with the function of the soft magnetic sheet recovery device 4, the measuring powder electrode can be closely fitted to the object to be measured. The nickel metal powder electrode is uniformly adsorbed on the soft magnetic sheet 7 and is close to the object to be measured, and the sensor circumference size is adjusted according to its size to achieve high-precision imaging of objects of different sizes; the width of the nickel powder electrode is controlled by adjusting the pull-out length of the soft magnetic sheet 7, and the artificial variability of the electrode gap ratio is realized. When the electrode gap ratio is determined, the electrode gap ratio of the electrode array is ensured to remain unchanged, which not only improves the imaging accuracy, but also enhances the flexibility of adjustment, so that the sensor can quickly switch between objects of different sizes. By adjusting the width of the powder electrode, the measurement range of the nickel powder variable size electrode capacitance tomography sensor is more flexible. When there is sufficient nickel powder and soft magnetic sheet 7 in the box, adjustment to any size can be achieved, which not only improves the adaptability of the measurement, but also greatly reduces the cost.

[0044] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A nickel powder variable size electrode capacitance tomography sensor, characterized in that: It comprises an acrylic isolation layer (1), a fixed installation frame (2), a powder electrode storage device (3), a soft magnetic sheet recovery device (4) and a nickel metal powder electrode array (5); Wherein, the acrylic isolation layer (1) surrounds the circumferential surface of the object to be tested and forms a pipeline structure; The fixed installation frame (2) surrounds the outer circumference of the acrylic isolation layer (1) and is a frame ring structure that can be opened and closed and is engraved with scales; a plurality of measuring rods (6) are evenly arranged around and interspersed on the outer circumference of the fixed installation frame (2); the powder electrode storage device (3) and the soft magnetic sheet recovery device (4) located on one side of the powder electrode storage device (3) are arranged in sequence at one end of the measuring rod (6) close to the acrylic isolation layer (1), and the powder electrode storage device (3) is located on the outer circumference of the acrylic isolation layer (1); Adjacent measuring rods (6) are connected via a soft magnetic sheet (7), and a fitting rod (8) is provided on the outer side of the soft magnetic sheet (7); The nickel metal powder electrode array (5) comprises a plurality of measuring electrodes evenly arranged around the circumference of the object to be measured.

2. A nickel powder variable size electrode capacitance tomography sensor according to claim 1, characterized in that: The acrylic isolation layer (1) comprises a to-be-tested object layer (101) and a soft magnetic layer (102); the to-be-tested object layer (101) is the inner wall of the acrylic isolation layer (1), and the soft magnetic layer (102) is the outer wall of the acrylic isolation layer (1).

3. A nickel powder variable size electrode capacitance tomography sensor according to claim 2, characterized in that: A copper sheet is embedded on the outer circumference of the soft magnetic sheet layer (102), and the copper sheet is connected to the shielding wire (9).

4. The nickel powder variable size electrode capacitance tomography sensor according to claim 3, characterized in that: The material of the object to be measured layer (101) and the soft magnetic sheet layer (102) is synthetic polymer acrylate.

5. The nickel powder variable size electrode capacitance tomography sensor according to claim 1, characterized in that: The fixed installation frame (2) comprises a main frame ring (201) symmetrically arranged at the top and bottom of the outer circumference of the acrylic isolation layer (1), and an auxiliary frame ring (202) arranged in the middle of the outer circumference of the acrylic isolation layer (1); A plurality of evenly arranged main body sliding components (203) are arranged on the outer circumference of the main body frame ring (201); A plurality of evenly arranged auxiliary sliding components (204) are arranged on the outer circumference of the auxiliary frame ring (202).

6. The nickel powder variable size electrode capacitance tomography sensor according to claim 5, characterized in that: The measuring rod (6) comprises a main measuring rod (601) inserted into the main sliding component (203) and an auxiliary measuring rod (602) inserted into the auxiliary sliding component (204), and one end of the main measuring rod (601) is connected to the powder electrode storage device (3), and one end of the auxiliary measuring rod (602) is connected to the bonding rod (8).

7. The nickel powder variable size electrode capacitance tomography sensor according to claim 1, characterized in that: The powder electrode storage device (3) comprises a powder electrode storage bottom box (301) and a push cover (302), and the powder electrode storage bottom box (301) and the push cover (302) are connected via a spring.

8. The nickel powder variable size electrode capacitance tomography sensor according to claim 7, characterized in that: The powder electrode storage bottom box (301) is provided with a powder electrode soft magnetic strip inlet (3011) and a powder electrode soft magnetic strip outlet (3012) on both sides thereof.

9. The nickel powder variable size electrode capacitance tomography sensor according to claim 8, characterized in that: The powder electrode soft magnetic strip inlet (3011) and the powder electrode soft magnetic strip outlet (3012) are both slit structures, and the height of the powder electrode soft magnetic strip outlet (3012) is greater than the width of the powder electrode soft magnetic strip inlet (3011).

10. The nickel powder variable size electrode capacitance tomography sensor according to claim 9, characterized in that: A volute spring (10) connected to the soft magnetic sheet (7) is arranged inside the soft magnetic sheet recovery device (4), and the other side of the volute spring (10) cooperates with the powder electrode soft magnetic strip outlet (3012).

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