CN220473428U - Detachable variable-diameter capacitance tomography sensor and imaging system - Google Patents
Detachable variable-diameter capacitance tomography sensor and imaging system Download PDFInfo
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- CN220473428U CN220473428U CN202320612664.8U CN202320612664U CN220473428U CN 220473428 U CN220473428 U CN 220473428U CN 202320612664 U CN202320612664 U CN 202320612664U CN 220473428 U CN220473428 U CN 220473428U
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Abstract
The utility model discloses a detachable variable-diameter capacitance tomography sensor and an imaging system, wherein the detachable variable-diameter capacitance tomography sensor comprises an array distribution electrode and an insulating elastic band; the measuring electrodes of the array distribution electrodes are formed by juxtaposing and partially overlapping sub-electrodes A and B; the outer side edges of the sub-electrodes A and B are fixed on the surface of the insulating elastic band, when the insulating elastic band contracts or extends, the lower surface of the sub-electrode A and the upper surface of the sub-electrode B of each electrode can be driven to relatively move, and meanwhile, the lower surface of the sub-electrode A and the upper surface of the sub-electrode B are kept in contact conduction, and the electrode coverage rate is kept unchanged; the two ends of the elastic band are connected through a buckle structure; the two ends of the elastic band are provided with positioning holes, and when the elastic band is in closed connection, the first measuring electrode and the last measuring electrode of the array distribution electrode have the same distance with the rest adjacent measuring electrodes through the positioning holes. The detachable variable-diameter capacitance tomography sensor provided by the utility model achieves the purpose of measuring objects with different diameters.
Description
Technical Field
The utility model relates to the technical field of sensor design, in particular to a detachable variable-diameter capacitance tomography sensor and an imaging system.
Background
The electric capacitance tomography (electrical capacitance tomography, abbreviated as ECT) technology is a process tomography technology based on the principle of capacitance sensitivity. The method obtains projection data (capacitance values) of a non-conductive measured object field under different observation angles through a group of specially designed capacitive sensor arrays arranged around the outline of an imaging area (such as a pipeline or a closed container), inverts the distribution of medium (dielectric constant) in the measured object field according to the sensor sensitivity field characteristics and a proper reconstruction algorithm of an inversion algorithm, gives a medium distribution result in the form of an image, can realize non-contact imaging of the dielectric constant in any shape structure, and is an ideal non-contact measurement technology. The electric capacitance tomography has the advantages of non-invasiveness, quick response, low cost, safety, no radiation and the like. The method is widely applied to two-phase flow and multiphase flow detection, is also applied to various aspects such as skull model temperature distribution imaging, stored grain moisture monitoring, frozen soil layer measurement, sliding bearing lubricating oil film measurement and the like, and relates to the fields of national economy and industry such as petroleum, chemical industry, electric power, metallurgy, building materials, medicine and the like. Therefore, the technology has wide application prospect and development potential.
The common two-dimensional ECT is formed by arranging n capacitance electrode arrays along the circumferential direction outside a circular insulating rigid pipeline or a rectangular section, forming a capacitance between every 2 electrodes, wherein m=n (n-1)/2 capacitances are in total, the size of the m capacitances is closely related to the distribution of dielectric constants in the pipeline, the in-pipeline sensitivity field S with the relation between the dielectric constants and the array capacitance is obtained through modeling the sensing characteristics in the pipeline, and the in-pipeline dielectric constant distribution is reconstructed according to the sensitivity field, the m array capacitances and a certain inversion algorithm. In the capacitance tomography sensor and the system disclosed in the prior art publication No. CN111175354B, an array electrode is surrounded on the outer peripheral wall of a test tube in an insulating manner through a supporting frame during measurement; the capacitive tomography sensor disclosed by publication No. CN110455877B and the like is a barrel-shaped sensor and sequentially comprises an array distribution electrode, an electrode insulation sleeve, a flange outer tube, an insulation tube and a signal transmission line from inside to outside; the equal circular insulating rigid pipeline is externally provided with n capacitance electrode arrays along the circumferential direction, and has the advantages that: in order to ensure the determination of a sensitive field, the sensor pipeline is generally in a rigid structure, the electrodes are arranged outside the insulating pipeline, and parameters such as the electrode size, the inner diameter and the outer diameter of the insulating pipeline, the dielectric constant of the pipeline and the like are all fixed values. The above structure has problems: (1) The fixed rigid structure can only make sensor measurements on contours of defined dimensions, and cannot be used for imaging in case of non-uniform contour dimensions (2) the sensor is not detachable in circumferential direction. The prior art publication No. CN209707433U discloses an irregular geometric ultrathin capacitance tomography device, and the imaging of an irregular pipeline arranged on the surface of a base is realized by arranging a shielding cover and a radial shielding polar plate, so that the problems still exist.
The purpose of the utility model is that: the sensor structure with the diameter of the sensor capable of being adjusted at will is provided, the sensor can be disconnected at the electrode gap to be convenient to detach, and the difficult problems that the diameter of the sensor cannot be changed in normal ECT measurement and the sensor cannot be detached are solved.
Disclosure of Invention
1. The technical problems to be solved are as follows:
according to the detachable variable-diameter capacitance tomography sensor and the imaging system, which are provided by the utility model, the imaging objects with different diameters can be measured by using a set of ECT instruments, and the sensor can be detached circumferentially.
2. The technical scheme is as follows:
a detachable variable diameter electric capacity chromatography imaging sensor which characterized in that: comprises an array distribution electrode and an insulating elastic band;
the array distribution electrode comprises a plurality of measurement electrodes which are uniformly arranged along the extending direction of the insulating elastic band;
the measuring electrodes are formed by juxtaposing and partially overlapping sub-electrodes A and sub-electrodes B; the outer side edges of the sub-electrode A and the sub-electrode B are fixed on the surface of an insulating elastic band through a fixing structure, the lower surface of the sub-electrode A is movably overlapped on the upper surface of the sub-electrode B, and when the insulating elastic band contracts or extends, the lower surface of the sub-electrode A and the upper surface of the sub-electrode B of each measuring electrode can be driven to move relatively, and meanwhile, the lower surface of the sub-electrode A and the upper surface of the sub-electrode B are kept in contact conduction; during measurement, the array distribution electrode is positioned at the inner side contacted with the surface of the pipeline to be imaged, and the insulating elastic belt is positioned at the outer side;
the two ends of the insulating elastic band are connected through a buckle structure; and positioning holes are formed in two ends of the elastic band, and when the insulating elastic band is in closed connection, the first measuring electrode and the last measuring electrode of the array distribution electrode are the same as the rest adjacent measuring electrodes in distance through the positioning holes.
Further, the outer sides of the sub-electrode A and the sub-electrode B are fixed on the surface of the insulating elastic band through screws.
Further, the array distribution electrode is at least one row of electrodes; at least 4 columns per row of electrodes; the length of the insulating elastic band is adapted to the perimeter of the surface of the imaging pipeline to be detected.
Further, the sub-electrode A and the sub-electrode B are sheet rectangles; the total width of each measuring electrode is W, and the widths of the sub-electrodes are W1 and W2 respectively; then W is smaller than w1+w2 when the insulating elastic band is in a normal operating state, i.e., when the insulating elastic band is elastically deformed.
Further, the sub-electrode A and the sub-electrode B are copper electrodes; is connected to the signal acquisition system through a wiring arranged on the measuring electrode.
Further, a shielding cover is arranged outside the insulating elastic band.
An imaging system of a detachable variable-diameter capacitance tomography sensor is applied to image acquisition of the detachable variable-diameter capacitance tomography sensor, the array distribution electrode is connected with a capacitance tomography signal acquisition system through a signal wire, the capacitance between the sensor electrodes is measured and digitized by the capacitance tomography signal acquisition system, and the capacitance between the sensor electrodes is transmitted to an imaging computer through a communication wire to finish image reconstruction.
3. The beneficial effects are that:
(1) The imaging system of the detachable variable-diameter capacitance tomography sensor can select an insulating elastic band with a corresponding length according to the circumference of a pipeline to be imaged, the electrode surface of the insulating elastic band is directly contacted with the surface of the pipeline, the insulating elastic band is stretched to enable the insulating elastic band to be elastically deformed, meanwhile, the sub-electrodes of each measuring electrode are driven to relatively displace, the measuring electrodes can be tightly attached to a measured object through the sensor connected with the electrodes to an imaging computer, and imaging errors caused by gaps between the measuring electrodes and the measured electrodes are avoided.
(2) The detachable variable-diameter capacitance tomography sensor is characterized in that the capacitance tomography electrode is fixed on the insulating elastic band, the insulating elastic band wraps the measured object, the circumference of the sensor can be automatically adjusted according to the diameter of the measured object, and therefore imaging of the measured object with different diameters is achieved.
(3) In the detachable variable-diameter capacitance tomography sensor adopted in the scheme, each measuring electrode consists of 2 sub-electrodes, and the edges of one side of each sub-electrode are fixed on an insulating elastic band. The overlapping proportion of the sub-electrodes in the measuring electrode is adjusted by the pulling-up proportion of the insulating elastic band so as to realize automatic adjustment of the electrode width, and the coverage rate of the electrode is not changed due to the change of the diameter of the measuring object.
(4) The detachable variable-diameter capacitance tomography sensor adopted by the scheme has no inner tube, high imaging precision, no influence of the dielectric constant of the inner tube and the thickness of the pipeline, and finally realizes one-time calibration to realize imaging under different sensor diameters. The conventional ECT sensor requires separate calibration for each size sensor.
(5) The detachable variable-diameter capacitance tomography sensor adopted by the utility model has the advantages that the diameter is variable, the ratio of the maximum inner diameter to the minimum inner diameter is close to 2, and the ratio of stepless adjustment to the minimum diameter can be realized in the range.
In summary, the detachable variable-diameter capacitance tomography sensor of the utility model fixes the capacitance tomography electrode on the elastic belt, thereby achieving the purpose of measuring objects with different diameters. The detachable ECT sensor is particularly suitable for the condition that a pipeline which is not required to be measured frequently and the ECT sensor cannot be installed in a pipeline cut-off mode, and the traditional ECT sensor cannot be achieved at all.
Drawings
FIG. 1 is a schematic diagram of a detachable variable diameter capacitance tomography sensor in an embodiment;
FIG. 2 is a schematic diagram of two sub-electrodes of a measurement electrode in an embodiment;
FIG. 3 is a schematic diagram showing displacement of the measuring electrode between sub-electrodes of the measuring electrode during imaging of catheters with different diameters in an embodiment;
FIG. 4 is a cross-sectional view of an electrode structure of a sensor in an embodiment for imaging catheters of different diameters.
Reference numerals: measuring electrode-1, insulating elastic band 2, sub-electrode A-11, sub-electrode B-12, screw 3.
Detailed Description
The present utility model will be described in detail with reference to the accompanying drawings.
A detachable variable diameter capacitive tomography sensor as in fig. 1-4, wherein: comprises an array distribution electrode and an insulating elastic band 2;
the array distribution electrode comprises a plurality of measurement electrodes 1 which are uniformly arranged along the extending direction of the insulating elastic band;
the measuring electrodes are formed by juxtaposing and partially overlapping sub-electrodes A and sub-electrodes B; the outer side edges of the sub-electrode A and the sub-electrode B are fixed on the surface of an insulating elastic band through a fixing structure, the lower surface of the sub-electrode A is movably overlapped on the upper surface of the sub-electrode B, and when the insulating elastic band contracts or extends, the lower surface of the sub-electrode A and the upper surface of the sub-electrode B of each measuring electrode can be driven to move relatively, and meanwhile, the lower surface of the sub-electrode A and the upper surface of the sub-electrode B are kept in contact conduction; during measurement, the array distribution electrode is positioned at the inner side contacted with the surface of the pipeline to be imaged, and the insulating elastic belt is positioned at the outer side; the sub-electrode a is denoted by reference numeral 11; the sub-electrode B is denoted by reference numeral 12.
The two ends of the insulating elastic band are connected through a buckle structure; and positioning holes are formed in two ends of the elastic band, and when the insulating elastic band is in closed connection, the first measuring electrode and the last measuring electrode of the array distribution electrode are the same as the rest adjacent measuring electrodes in distance through the positioning holes.
Further, the outer sides of the sub-electrode A and the sub-electrode B are fixed on the surface of the insulating elastic band through screws 3.
Further, the array distribution electrode is at least one row of electrodes; at least 4 columns per row of electrodes; the length of the insulating elastic band is adapted to the perimeter of the surface of the imaging pipeline to be detected.
Further, the sub-electrode A and the sub-electrode B are sheet rectangles; the total width of each measuring electrode is W, and the widths of the sub-electrodes are W1 and W2 respectively; then W is smaller than w1+w2 when the insulating elastic band is in a normal operating state, i.e., when the insulating elastic band is elastically deformed.
Further, the sub-electrode A and the sub-electrode B are copper electrodes; is connected to the signal acquisition system through a wiring arranged on the measuring electrode.
Further, a shielding cover is arranged outside the insulating elastic band.
An imaging system of a detachable variable-diameter capacitance tomography sensor is applied to image acquisition of the detachable variable-diameter capacitance tomography sensor, the array distribution electrode is connected with a capacitance tomography signal acquisition system through a signal wire, the capacitance between the sensor electrodes is measured and digitized by the capacitance tomography signal acquisition system, and the capacitance between the sensor electrodes is transmitted to an imaging computer through a communication wire to finish image reconstruction.
Specific examples:
as shown in fig. 1-4, the present embodiment uses an 8-electrode capacitance tomography system as an example E1-E8 distribution to represent a single measurement electrode; in this embodiment, two working conditions are adopted for comparison: (1) The circumference of the pipeline to be imaged is smaller than the length of the selected insulating elastic band when the pipeline is not stressed, and the diameter of the pipeline is 100mm as shown in the figure; (2) The diameter of the tube to be imaged is marked 160mm in the figure when it is longer in circumference.
As shown in fig. 1, each measuring electrode comprises a sub-electrode a and a sub-electrode B, wherein the length of the insulating elastic band is denoted as C, and two ends of the insulating elastic band are connected in a closed loop through a buckle structure. The surface of the insulating elastic band is uniformly provided with 8 measuring electrodes with one section (one row), and each measuring electrode is a copper electrode with the thickness of 0.1 mm. When the insulating elastic band is elastically deformed under force, the electrode width W of each measuring electrode, the total length of the elastic band and the distance between adjacent electrodes become equal proportional.
As shown in fig. 2 and 3, each measuring electrode is formed by overlapping and combining a sub-electrode a and a sub-electrode B, the left edge of the sub-electrode a and the right edge of the sub-electrode B are respectively provided with 3 fixing screws which are fixed on an insulating elastic band, the width of the insulating elastic band is slightly wider than the axial length L of the electrode, and 8 electrodes are uniformly distributed on the insulating elastic band. The sub-electrodes in this embodiment are rectangular with the same shape, so that when the insulating elastic band is stretched, the two sub-electrodes can overlap each other, thereby realizing communication.
As shown in fig. 1 and 4, the larger the stress F of the insulating elastic band in this solution, the longer the total length C of the elastic band, and it can be known from the elastic deformation formula that the ratio of the electrode width W on the elastic band to the inter-electrode gap P is always ensured to be unchanged as long as the insulating elastic band is in the elastic deformation or elongation range. The uppermost graph in fig. 1 shows an external view and a sectional view when the insulating elastic force is less, and the lower graph shows an external view and a sectional view when the insulating elastic force is more. When imaging cylindrical imaging areas with different diameters, the elastic band of fig. 1 is wrapped on the cylinder to be measured, the measuring electrode is positioned inwards, and the elastic band is positioned at the outer side of the electrode. The measuring area is wrapped up through the buckle at elastic band both ends, realizes detachable function. The elastic band ensures that the gap between the electrode 1 and the electrode 8 is the same as the gap between other electrodes through the positioning holes. The electrode directly acts on the measured medium, and no isolation pipeline exists between the electrode and the measured medium. The length C of the elastic band, the width W of the electrode and the gap P between the electrodes are adaptively adjusted according to the diameter of an imaging area, and the axial length L of the electrode is kept unchanged and is not influenced by the diameter of a measured object. Each electrode obtains the electrode width W at different imaging area diameters by adjusting the overlapping proportion of the two sub-electrodes A, B.
As shown in fig. 3, if the diameter of the imaging circle is increased by 1.6 times, the distance between the screws of the fixed sub-electrode a and the sub-electrode B, i.e., the electrode width W, is also increased by 1.6 times, as shown in fig. 4. Since the electrode width W varies proportionally with the circumferential length C, the electrode opening angle θ remains constant before and after the sensor diameter varies. That is, the positions and dimensions between the electrodes are also changed proportionally, the area of 2 electrodes of one capacitor is increased, and the distance is correspondingly increased, and the axial length L of the electrodes is always unchanged. From the basic relationship of capacitance=dielectric constant X area/distance, the capacitance is unchanged before and after the sensor diameter is changed. Therefore, after the diameter of the sensor is changed, the sensor does not need to be calibrated again by filling the tube with air. The variable-diameter capacitance tomography sensor can image under different sensor pipe diameters under the condition that a measuring medium is unchanged by only performing one-time empty-full pipe calibration.
And meanwhile, a shielding cover is arranged outside the elastic band to prevent interference of external electromagnetic signals. The sub-electrode a and the sub-electrode B remain sufficiently conductive. The electrode signals are led out through the fixing screws, and the fixing screws are connected with the capacitance acquisition instrument through the shielding wires.
While the utility model has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the utility model, and it is intended that the scope of the utility model shall be limited only by the claims appended hereto.
Claims (7)
1. A detachable variable diameter electric capacity chromatography imaging sensor which characterized in that: comprises an array distribution electrode and an insulating elastic band;
the array distribution electrode comprises a plurality of measurement electrodes which are uniformly arranged along the extending direction of the insulating elastic band;
the measuring electrodes are formed by juxtaposing and partially overlapping sub-electrodes A and sub-electrodes B; the outer side edges of the sub-electrode A and the sub-electrode B are fixed on the surface of an insulating elastic band through a fixing structure, the lower surface of the sub-electrode A is movably overlapped on the upper surface of the sub-electrode B, and when the insulating elastic band contracts or extends, the lower surface of the sub-electrode A and the upper surface of the sub-electrode B of each measuring electrode can be driven to move relatively, and meanwhile, the lower surface of the sub-electrode A and the upper surface of the sub-electrode B are kept in contact conduction; during measurement, the array distribution electrode is positioned at the inner side contacted with the surface of the pipeline to be imaged, and the insulating elastic belt is positioned at the outer side;
the two ends of the insulating elastic band are connected through a buckle structure; and positioning holes are formed in two ends of the elastic band, and when the insulating elastic band is in closed connection, the first measuring electrode and the last measuring electrode of the array distribution electrode are the same as the rest adjacent measuring electrodes in distance through the positioning holes.
2. The detachable variable diameter capacitive tomography sensor of claim 1, wherein: the outer side edges of the sub-electrode A and the sub-electrode B are fixed on the surface of the insulating elastic band through screws.
3. The detachable variable diameter capacitive tomography sensor of claim 1, wherein: the array distribution electrode is at least one row of electrodes; at least 4 columns per row of electrodes; the length of the insulating elastic band is adapted to the perimeter of the surface of the imaging pipeline to be detected.
4. The detachable variable diameter capacitive tomography sensor of claim 2, wherein: the sub-electrode A and the sub-electrode B are sheet rectangles; the total width of each measuring electrode is W, and the widths of the sub-electrodes are W1 and W2 respectively; then W is smaller than w1+w2 when the insulating elastic band is in a normal operating state, i.e., when the insulating elastic band is elastically deformed.
5. The detachable variable diameter capacitive tomography sensor of claim 1, wherein: the sub-electrode A and the sub-electrode B are copper electrodes; is connected to the signal acquisition system through a wiring arranged on the measuring electrode.
6. The detachable variable diameter capacitive tomography sensor of claim 1, wherein: and a shielding cover is arranged outside the insulating elastic band.
7. An imaging system of a detachable variable diameter capacitance tomography sensor, which uses a detachable variable diameter capacitance tomography sensor according to any one of claims 1-6 for image acquisition; the method is characterized in that: the array distribution electrodes are connected with a capacitance tomography signal acquisition system through signal wires, the capacitance between the sensor electrodes is measured and digitized by the capacitance tomography signal acquisition system, and the capacitance is transmitted to an imaging computer through a communication wire to finish image reconstruction.
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| CN202320612664.8U CN220473428U (en) | 2023-03-27 | 2023-03-27 | Detachable variable-diameter capacitance tomography sensor and imaging system |
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