Defect detection method, device and equipment for high-temperature superconducting cable, medium and product

Abstract

The invention provides a defect detection method, device and equipment for a high-temperature superconducting cable, a medium and a product. The method comprises the following steps: acquiring magnetic induction intensity measured by each probe in a probe matrix; wherein all probes in the probe matrix are uniformly distributed on the same circumference; the intersection position of the radial direction of the circumference where each probe is located and the surface of the to-be-measured high-temperature superconducting cable is used as the position where each magnetic dipole is located; determining the magnetic moment and the torsional angle of each magnetic dipole according to the magnetic induction intensity measured by each probe in the probe matrix; and determining a defect position on the to-be-detected high-temperature superconducting cable based on a magnetic moment fitting curve formed by the magnetic moments of the magnetic dipoles on the to-be-detected high-temperature superconducting cable and a torsional angle fitting curve formed by the torsional angles of the magnetic dipoles. According to the method, the probe matrix is used for measuring the magnetic performance of the high-temperature superconducting cable, direct contact with the cable is not needed, contact damage to the cable is avoided, and continuous detection of the high-temperature superconducting cable can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of superconducting materials, and in particular to a defect detection method, device, equipment, medium and product for high-temperature superconducting cables. Background Art

[0002] Superconductors are materials that can exhibit superconductivity under certain low-temperature conditions. If they are classified according to the different refrigerants used to cool superconductors, they can be divided into low-temperature superconducting materials cooled by liquid helium and high-temperature superconducting materials cooled by liquid nitrogen.

[0003] High-temperature superconducting materials are essentially ceramic materials, so defects are easily introduced during processing and manufacturing. In particular, high-temperature superconducting cables may cause local minor defects during the winding process, which may become a weakness in the cable performance and cause hidden dangers to safe operation.

[0004] To find these defects, continuous detection methods need to be introduced. The existing continuous detection methods mainly include the DC four-lead method and the magnetic measurement method. The DC four-lead method (also known as the Kelvin four-wire detection) is a commonly used method for measuring the current and uniformity of superconducting tapes. In the continuous detection mode of the DC four-lead method, a certain distance needs to be maintained between the voltage leads. If the distance is too close, the voltage will be inaccurate; if the distance is too far, the local n value cannot be obtained, and only the average effective value can be obtained; in addition, in the continuous detection mode, the voltage leads of the four-lead method need to be replaced by rollers, which introduces uncertain contact resistance and reduces the accuracy of the test results. The magnetic measurement method is a non-contact induction test method. At present, the magnetic measurement method can realize continuous performance detection of hard skeleton superconducting cables, but when this method is used for flexible skeleton cables (referred to as soft cables), the measured data is often messy and irregular, so the magnetic measurement method is not suitable for soft cable detection. Summary of the invention

[0005] The present invention provides a defect detection method, device, equipment, medium and product for a high-temperature superconducting cable, which are used to solve the defect that the performance data of a flexible firmware cable measured by a magnetic measurement method in the prior art is disorderly and irregular. It can not only realize continuous performance detection of a hard skeleton superconducting cable, but also realize accurate positioning of defects of a flexible skeleton high-temperature superconducting cable.

[0006] The present invention provides a method for detecting defects in a high-temperature superconducting cable, comprising the following steps: Acquire the magnetic induction intensity measured by each probe in the probe matrix; wherein all the probes in the probe matrix are evenly distributed on the same circumference, and the circumference surrounds the cross section of the high-temperature superconducting cable to be measured; The intersection of the radial direction of the circle where each probe is located and the surface of the high-temperature superconducting cable to be tested is taken as the location of each magnetic dipole; Determine the magnetic moment and torsion angle of each magnetic dipole according to the magnetic induction intensity measured by each probe in the probe matrix; Based on the magnetic moment fitting curve formed by the magnetic moments of each magnetic dipole on the high-temperature superconducting cable to be tested and the torsion angle fitting curve formed by the torsion angle of each magnetic dipole, the defect position on the high-temperature superconducting cable to be tested is determined.

[0007] According to a defect detection method for a high-temperature superconducting cable provided by the present invention, the magnetic moment and torsion angle of each magnetic dipole are determined according to the magnetic induction intensity measured by each probe in the probe matrix, including: Taking the center of the probe matrix as the origin and the plane where the probe matrix is ​​located, a plane rectangular coordinate system is constructed; Constructing a regression equation according to the position of each magnetic dipole in the plane rectangular coordinate system, the components of the magnetic moment of the magnetic dipole on the horizontal axis and the vertical axis of the plane rectangular coordinate system, and the magnetic induction intensity measured by the probe corresponding to each magnetic dipole; The magnetic moment of each magnetic dipole in the regression equation is fitted using the least square method to obtain the magnetic moment and torsion angle of each magnetic dipole.

[0008] According to a defect detection method for a high-temperature superconducting cable provided by the present invention, after comparing the magnetic moment and torsion angle of each magnetic dipole with the magnetic moment and torsion angle of a standard magnetic moment and determining the defect position on the high-temperature superconducting cable to be tested according to the comparison result, the method further includes: The magnetic moment and torsion angle of each magnetic dipole are compared with the standard magnetic moment and standard torsion angle on a standard high-temperature superconducting cable, and the defect position on the high-temperature superconducting cable to be tested is determined according to the comparison result; wherein the standard magnetic moment and the standard torsion angle are standard values ​​pre-measured using the standard high-temperature superconducting cable.

[0009] According to a defect detection method for a high-temperature superconducting cable provided by the present invention, before obtaining the magnetic induction intensity measured by each probe in the probe matrix, the method includes: After the high-temperature superconducting cable to be tested is subjected to excitation in at least two different directions, the excitation is stopped.

[0010] According to a defect detection method for a high-temperature superconducting cable provided by the present invention, after determining the defect position on the high-temperature superconducting cable to be tested based on the magnetic moment fitting curve formed by the magnetic moments of each magnetic dipole on the high-temperature superconducting cable to be tested and the torsion angle fitting curve formed by the torsion angle of each magnetic dipole, the method further comprises: Entering the next time step; wherein the high-temperature superconducting cable to be tested travels a preset distance in the next time step at a preset moving speed; Return to the step of obtaining the magnetic induction intensity measured by each probe in the probe matrix.

[0011] According to a high-temperature superconducting cable defect detection method provided by the present invention, the sampling frequency of the probe matrix is ​​greater than or equal to a preset value.

[0012] The present invention also provides a defect detection device for a high-temperature superconducting cable, comprising the following modules: A magnetic induction intensity acquisition module, used to acquire the magnetic induction intensity measured by each probe in the probe matrix; wherein all the probes in the probe matrix are evenly distributed on the same circumference, and the circumference surrounds the cross section of the high-temperature superconducting cable to be measured; A magnetic dipole position determination module, used to take the intersection of the radial direction of the circle where each probe is located and the surface of the high-temperature superconducting cable to be tested as the position of each magnetic dipole; A magnetic moment calculation module, used to determine the magnetic moment and torsion angle of each magnetic dipole according to the magnetic induction intensity measured by each probe in the probe matrix; The defect position determination module is used to determine the defect position on the high-temperature superconducting cable to be tested based on the magnetic moment fitting curve formed by the magnetic moments of each magnetic dipole on the high-temperature superconducting cable to be tested and the torsion angle fitting curve formed by the torsion angle of each magnetic dipole.

[0013] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, a defect detection method for a high-temperature superconducting cable as described above is implemented.

[0014] The present invention also provides a non-transitory computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the defect detection method for a high-temperature superconducting cable as described in any one of the above is implemented.

[0015] The present invention also provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the defect detection method for a high-temperature superconducting cable as described in any one of the above is implemented.

[0016] The defect detection method, device, equipment, medium and product of the high-temperature superconducting cable provided by the present invention are obtained by obtaining the magnetic induction intensity measured by each probe in the probe matrix; wherein all the probes in the probe matrix are evenly distributed on the same circumference, and the circumference surrounds the cross section of the high-temperature superconducting cable to be tested; the radial intersection of the circumference where each probe is located and the surface of the high-temperature superconducting cable to be tested is used as the location of each magnetic dipole; according to the magnetic induction intensity measured by each probe in the probe matrix, the magnetic moment and torsion angle of each magnetic dipole are determined; based on the magnetic moment fitting curve formed by the magnetic moment of each magnetic dipole on the high-temperature superconducting cable to be tested and the torsion angle fitting curve formed by the torsion angle of each magnetic dipole, the defect position on the high-temperature superconducting cable to be tested is determined. The method uses the probe matrix to measure the magnetic properties of the high-temperature superconducting cable, does not need to be in direct contact with the cable, and avoids contact damage to the cable. Further, by using the defect detection method of the present application, the magnetic dipole magnetic moment size will not change due to torsion angle and offset, so the method does not need to consider the torsion and offset of the cable during the detection process, so it is particularly suitable for continuous detection of superconducting soft cable performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are 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 The present invention is a schematic diagram of the structure of a device for detecting the performance of a high-temperature superconducting cable.

[0019] Figure 2 It is a schematic diagram of the performance detection principle of the high-temperature superconducting cable provided by the present invention.

[0020] Figure 3 This is one of the flow charts of the defect detection method for high-temperature superconducting cables provided by the present invention.

[0021] Figure 4 It is a schematic diagram of the detection results of the defect detection method for high-temperature superconducting cables provided by the present invention.

[0022] Figure 5 This is the second flow chart of the defect detection method for high-temperature superconducting cables provided by the present invention.

[0023] Figure 6 It is a structural schematic diagram of a defect detection device for a high-temperature superconducting cable provided by the present invention.

[0024] Figure 7 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Combine the following Figure 1-Figure 7 Specific embodiments of the present invention are described.

[0027] Figure 1 Schematic diagram of the device structure of the performance detection device of the high-temperature superconducting cable provided by the present invention. Figure 1 As shown, the performance detection device mainly includes an X-direction excitation device, a Y-direction excitation device and a probe matrix tooling, wherein a plurality of magnetic field probes are arranged on the probe matrix tooling for measuring the magnetic field intensity (also called magnetic induction intensity) in the magnetic field. All the probes in the probe matrix are evenly distributed on a circle with the center of the matrix as the center. During measurement, the high-temperature superconducting cable passes through the center of the above-mentioned probe matrix and moves continuously to realize continuous detection.

[0028] like Figure 2 As shown, Figure 2 The schematic diagram of the measurement principle of the residual magnetism method applicable to this application is shown. The residual magnetism method is a non-destructive detection technology based on physical principles. Its basic principle is to use the magnetic effect of electric current: when electric current passes through a conductor, a magnetic field is generated around it, and the ferromagnetic material in the magnetic field will be magnetized. Even if the current disappears, the ferromagnetic material will still maintain a certain magnetism. This magnetism is called residual magnetism (residual magnetic induction intensity).

[0029] Figure 2 In this method, an external excitation is applied to a high-temperature superconducting cable. When the external excitation completely penetrates the superconducting cable, eddy currents are induced in the cable. The magnetic field generated is opposite to the direction of the external magnetic field, and its magnitude is related to the critical current of the cable. This is similar to the magnetic measurement method of superconducting tapes. The eddy current is approximately regarded as a circular current (such as Figure 2 As shown in the right figure in the figure, when the size of the circular current is very small relative to its distance to the probe, the circular current can be regarded as a magnetic dipole. Therefore, the magnetic moment of the magnetic dipole can be used to represent the magnetic moment of the eddy current, which represents the critical current performance of the superconducting cable.

[0030] Figuratively speaking, the magnetic field of a magnetic dipole is similar to the magnetic field of a small magnetic needle: when the superconducting cable rotates, the magnetic dipole magnetic moment will also rotate, similar to the rotation of a small magnetic needle; when the superconducting cable is offset, the magnetic field generated by the magnetic dipole will also be offset, similar to the change in the position of the small magnetic needle. Therefore, it can be considered that if a defective position appears on the superconducting cable, the position and direction of the magnetic dipole at the defective position are different from those of the standard high-temperature superconducting cable (i.e., the standard part of the high-temperature superconducting cable without defects). Therefore, it can be seen that the defective position can be determined by measuring the magnetic moment at various positions on the surface of the high-temperature superconducting cable.

[0031] Figure 3 The present invention provides a method for detecting defects in a high-temperature superconducting cable, which includes the following steps: Step 301: Obtain the magnetic induction intensity measured by each probe in the probe matrix ; wherein all the probes in the probe matrix are evenly distributed on the same circumference, and the circumference surrounds the cross-section of the high-temperature superconducting cable to be tested.

[0032] Specifically, Figure 1 As shown in the figure, apply excitation to the high-temperature superconducting cable to ensure that the excitation can completely penetrate the superconducting cable. After turning off the excitation, use the probe matrix to measure the magnetic field excited on the high-temperature superconducting cable. , It represents the magnetic induction intensity measured by the i-th probe, that is, the magnetic field observation value.

[0033] For example, the performance of 4mm wide YBCO (Yttrium Barium Copper Oxide) armored tape was tested. The length of the YBCO armored tape was about 300mm, and the travel speed was 6mm / s to achieve continuous testing. Three experiments were conducted, and the tape was artificially tilted at 0°, 20° and 30° in each experiment. The excitation device generated 0.1T, which was twice the cable penetration magnetic field (0.08T), and the excitation direction was perpendicular to the surface of the tape. 8 probes were set in the probe matrix, each probe was 4.5mm away from the center of the probe matrix, and the plane where the probe matrix was located was 200mm away from the excitation device.

[0034] Step 302, taking the intersection of the radial direction of the circle where each probe is located and the surface of the high-temperature superconducting cable to be tested as the location of each magnetic dipole; Specifically, after the excitation device is turned off, the magnetic field measured by each probe in the probe matrix can be approximately regarded as the magnetic field generated by the corresponding magnetic dipole on the high-temperature superconducting cable. The intersection of the radial direction of the circle where each probe is located and the surface of the high-temperature superconducting cable to be measured is taken as the location of each magnetic dipole.

[0035] Step 303: Measure the magnetic induction intensity of each probe in the probe matrix. , determine the magnetic moment of each magnetic dipole ; Specifically, assuming that the probes are evenly distributed on a circle with a radius of R, a rectangular coordinate system is constructed with the plane where the probe matrix is ​​located, and the origin is the center O of the probe matrix. Then the magnetic moment of any magnetic dipole is The components in the X and Y directions are respectively denoted as , , let the distance between any magnetic dipole and the center of the probe matrix (i.e., the origin of coordinates) O be p, then the components of p in the X and Y directions are respectively , .

[0036] If any probe is on the XOY plane, the angle between it and the horizontal axis is denoted as θ, and the distance between the probe and its corresponding magnetic dipole is denoted as d, then the components of d in the X and Y directions are respectively denoted as , , so we have: ; (1) Then a vector is formed between any probe and its corresponding magnetic dipole : ; (2) in, , are unit vectors on the X and Y axes (actually the observed values ​​of the unit vectors).

[0037] Based on the magnetic field measurements of either probe , the position of the magnetic dipole corresponding to the probe , the magnetic moment of the magnetic dipole Components on the X and Y axes , the regression equation is constructed as follows: ; (3) in, is the vacuum magnetic permeability, r is the distance between the probe and its corresponding magnetic dipole, is the magnetic moment of a single magnetic dipole, θ is the angle between the i-th probe and the X-axis direction in the above XOY plane coordinate system; , are the components of the distance d between the probe and its corresponding magnetic dipole in the X and Y directions, respectively; , is the magnetic moment of the magnetic dipole Components in the X and Y directions.

[0038] Substituting the above formulas (1) and (2) into the above formula (3), it can be seen that the problem is transformed into finding the position of the magnetic dipole corresponding to the probe. , the magnetic moment of the magnetic dipole Components on the X and Y axes This application uses the least squares method to solve the above formula (3) , By fitting, we can get , .

[0039] Then the magnetic moment m of the magnetic dipole is obtained: ; (4) and the position of the magnetic dipole and the torsion angle α, where is the distance between the magnetic dipole and the center of the probe matrix (i.e., the coordinate origin) O.

[0040] ; (5) The above formulas (4) and (5) can determine the magnetic moment of the magnetic dipole and the torsion angle α.

[0041] Step 304: Determine the defect position on the high-temperature superconducting cable to be tested based on the magnetic moment fitting curve formed by the magnetic moments of each magnetic dipole on the high-temperature superconducting cable to be tested and the torsion angle fitting curve formed by the torsion angle of each magnetic dipole.

[0042] Specifically, according to the above steps 301-303, the magnetic moment and torsion angle of the magnetic dipoles at various locations on the 4 mm wide YBCO armored strip are measured in sequence, that is, the strip moves through the above annularly distributed probe matrix at a certain speed, and the magnetic dipoles on the strip surface are measured using the probe matrix, and the magnetic moment curve and torsion angle curve of the magnetic dipoles at various locations on the strip surface are fitted to obtain the following: Figure 4 The fitting curve shown is from Figure 4 The fitted magnetic moment in the figure clearly shows that there are two depressions, and their torsion angles correspond to the artificial rotation angles in the three experiments, which verifies the principle of the defect detection method.

[0043] Optionally, after step 304, the above step further includes: comparing the magnetic moment and torsion angle of each magnetic dipole with the standard magnetic moment and standard torsion angle on a standard high-temperature superconducting cable, and determining the defect position on the high-temperature superconducting cable to be tested according to the comparison result; wherein the standard magnetic moment and the standard torsion angle are standard values ​​pre-measured using the standard high-temperature superconducting cable.

[0044] Specifically, in the above step 304, the cable performance cannot be directly read from the size of the fitted magnetic moment, so the method also uses a standard high-temperature superconducting cable (i.e., a defect-free high-temperature superconducting cable) to calibrate in advance to obtain the standard value of the magnetic moment and the standard value of the torsion angle of the magnetic dipole. The magnetic moment and torsion angle of each magnetic dipole of the high-temperature superconducting cable to be tested are compared with the standard magnetic moment and standard torsion angle of the standard high-temperature superconducting cable, and the defect position and the magnetic moment size corresponding to the defect can be directly read according to the comparison result.

[0045] In the above embodiment, the magnetic induction intensity measured by each probe in the probe matrix is ​​obtained; wherein all the probes in the probe matrix are evenly distributed on the same circumference, and the circumference surrounds the cross section of the high-temperature superconducting cable to be tested; the intersection of the radial direction of the circumference where each probe is located and the surface of the high-temperature superconducting cable to be tested is used as the location of each magnetic dipole; the magnetic moment and torsion angle of each magnetic dipole are determined according to the magnetic induction intensity measured by each probe in the probe matrix; the defect location on the high-temperature superconducting cable to be tested is determined based on the magnetic moment fitting curve formed by the magnetic moment of each magnetic dipole on the high-temperature superconducting cable to be tested and the torsion angle fitting curve formed by the torsion angle of each magnetic dipole. This method uses a probe matrix to measure the magnetic properties of a high-temperature superconducting cable, does not require direct contact with the cable, and avoids contact damage to the cable.

[0046] It should be noted that due to engineering needs, the long superconducting cable must be able to be coiled, so it must be a soft cable. When using the residual magnetism method for detection, due to the separation of excitation and detection, it is necessary to travel a certain distance from the excitation area to the detection area; and after the coiled soft cable is straightened, due to stress release, it is likely to twist at a certain angle during the travel process, and the center of the cable deviates from the center of the detection area. In this case, even if a probe matrix is ​​used, it is possible that no probe data can represent the performance of the cable, which is why the detection data of the soft cable is often messy and irregular. Using the defect detection method of the present application, the size of the magnetic dipole magnetic moment will not change due to torsion angle or offset, so this method does not need to consider the torsion and offset of the cable during the detection process, so it is particularly suitable for continuous detection of superconducting soft cable performance.

[0047] In one embodiment, the above step 303 includes: taking the center of the probe matrix as the origin and constructing a plane rectangular coordinate system with the plane where the probe matrix is ​​located; according to the position of each magnetic dipole in the above plane rectangular coordinate system , the components of the magnetic moment of the magnetic dipole on the horizontal and vertical axes of the above plane rectangular coordinate system The magnetic induction intensity measured by the probe corresponding to each magnetic dipole The relationship between them is used to construct a regression equation; the magnetic moments of each magnetic dipole in the above regression equation are calculated using the least squares method. The fitting is performed to obtain the magnetic moment m and torsion angle α of each magnetic dipole.

[0048] Specifically, as described above, the center of the probe matrix is ​​taken as the origin O, and a plane rectangular coordinate system is constructed with the plane where the probe matrix is ​​located. The regression equation is constructed as shown in the above formula (3). This application uses the least squares method to calculate the regression equation in the above formula (3). , By fitting, we can get , To expand on this, in order to solve the above equation (3), the least squares method is used to solve the above , Fitting is performed to make the expected magnetic induction intensity measured by each probe Minimum, finally get the magnetic moment of each magnetic dipole The fitting values ​​and the positions of the magnetic dipoles , and the torsion angle α of the magnetic dipole can be calculated according to the above formula (5).

[0049] in, is the measurement value of the i-th probe, is the actual value of the magnetic induction intensity at the i-th probe, and n represents the total number of probes in the probe matrix.

[0050] In the above embodiment, by constructing a relationship equation between the magnetic field measurement value of each probe and the magnetic moment of each magnetic dipole, and fitting the magnetic moment of each magnetic dipole in the least squares equation, the magnetic moment fitting value of each magnetic dipole and the torsion angle of each magnetic dipole can be obtained, thereby providing a reliable performance indicator for judging the performance of the high-temperature superconducting cable.

[0051] In an embodiment, before step 301, the method includes: performing excitation in at least two different directions on the high-temperature superconducting cable to be tested, and then stopping the excitation.

[0052] Specifically, if the magnet is excited only once before detection, the eddy current corresponding to the residual magnetic moment is similar to the attached Figure 2 As shown in the distribution, there is almost no eddy current in some areas of the high-temperature superconducting cable, so naturally the defects in such areas cannot be detected. To solve this problem, at least two excitations in different directions are required during excitation, such as applying excitation in the X direction and Y direction to the high-temperature superconducting cable to ensure that defects in all areas of the cable are covered. The rotation and offset of the high-temperature superconducting cable after excitation does not affect the detection results.

[0053] The above embodiment ensures that all areas on the high-temperature superconducting cable are penetrated by the magnetic field through a multi-directional excitation method, so as to facilitate the subsequent measurement of the accurate magnetic moment of the magnetic dipole using the residual magnetism method.

[0054] In one embodiment, after the above step 304, the process further includes: entering a next time step; wherein the high-temperature superconducting cable to be tested moves a preset distance in the next time step at a preset moving speed; and returning to step 301.

[0055] Specifically, Figure 5 As shown, the present application can realize continuous detection, that is, in the first time step data, the probe matrix obtains the measurement value, and the magnetic dipole data is fitted based on the above formula (3). If the error between the fitted data and the collected data is within an acceptable range, the regression equation parameters are extracted, that is, the magnetic moment of each magnetic dipole is calculated. The fitting values ​​and the positions of the magnetic dipoles , and the magnetic moment m and torsion angle α are calculated based on the fitting values. Entering the next time step, the high-temperature superconducting cable to be tested continues to move forward a certain distance, and the probe matrix starts the next data collection.

[0056] In the above embodiment, continuous detection of the high-temperature superconducting cable is achieved by designing the time step.

[0057] In one embodiment, the sampling frequency of the probe matrix is ​​greater than or equal to a preset value.

[0058] In this embodiment, by setting the sampling frequency of the probe matrix, data synchronization can be ensured and the accuracy of the calculation results can be improved.

[0059] The defect detection device for a high-temperature superconducting cable provided by the present invention is described below. The defect detection device for a high-temperature superconducting cable described below and the defect detection method for a high-temperature superconducting cable described above can be referred to each other.

[0060] like Figure 6 As shown, the present application provides a defect detection device for a high-temperature superconducting cable, the device comprising the following modules: A magnetic induction intensity acquisition module 601 is used to acquire the magnetic induction intensity measured by each probe in the probe matrix; wherein all the probes in the probe matrix are evenly distributed on the same circumference, and the circumference surrounds the cross section of the high-temperature superconducting cable to be measured; A magnetic dipole position determination module 602 is used to determine the intersection of the radial direction of the circle where each probe is located and the surface of the high-temperature superconducting cable to be tested as the position of each magnetic dipole; A magnetic moment calculation module 603, used to determine the magnetic moment and torsion angle of each magnetic dipole according to the magnetic induction intensity measured by each probe in the probe matrix; The defect position determination module 604 is used to determine the defect position on the high-temperature superconducting cable to be tested based on the magnetic moment fitting curve formed by the magnetic moments of each magnetic dipole on the high-temperature superconducting cable to be tested and the torsion angle fitting curve formed by the torsion angle of each magnetic dipole.

[0061] In one embodiment, the magnetic moment calculation module 603 is further used to: Taking the center of the probe matrix as the origin and the plane where the probe matrix is ​​located, a plane rectangular coordinate system is constructed; Constructing a regression equation according to the position of each magnetic dipole in the plane rectangular coordinate system, the components of the magnetic moment of the magnetic dipole on the horizontal axis and the vertical axis of the plane rectangular coordinate system, and the magnetic induction intensity measured by the probe corresponding to each magnetic dipole; The magnetic moment of each magnetic dipole in the regression equation is fitted using the least square method to obtain the magnetic moment and torsion angle of each magnetic dipole.

[0062] In one embodiment, the defect position determination module 604 is further used to compare the magnetic moment and torsion angle of each magnetic dipole with the standard magnetic moment and standard torsion angle on a standard high-temperature superconducting cable, and determine the defect position on the high-temperature superconducting cable to be tested according to the comparison result; wherein the standard magnetic moment and the standard torsion angle are standard values ​​pre-measured using the standard high-temperature superconducting cable.

[0063] In one embodiment, it further comprises an excitation module, which is used to stop excitation after performing excitation in at least two different directions on the high-temperature superconducting cable to be tested.

[0064] In one embodiment, it also includes a time step counter for: entering the next time step; wherein the high-temperature superconducting cable to be tested travels a preset distance within the next time step at a preset moving speed; and returning to the step of obtaining the magnetic induction intensity measured by each probe in the probe matrix.

[0065] In one embodiment, the sampling frequency of the probe matrix is ​​greater than or equal to a preset value.

[0066] Figure 7 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 7As shown, the electronic device may include: a processor 710, a communication interface 720, a memory 730 and a communication bus 740, wherein the processor 710, the communication interface 720 and the memory 730 communicate with each other through the communication bus 740. The processor 710 may call the logic instructions in the memory 730 to execute the defect detection method of the high-temperature superconducting cable, the method comprising: obtaining the magnetic induction intensity measured by each probe in the probe matrix; wherein all the probes in the probe matrix are evenly distributed on the same circumference, and the circumference surrounds the cross section of the high-temperature superconducting cable to be tested; taking the intersection of the radial direction of the circumference where each probe is located and the surface of the high-temperature superconducting cable to be tested as the location of each magnetic dipole; determining the magnetic moment and torsion angle of each magnetic dipole according to the magnetic induction intensity measured by each probe in the probe matrix; determining the defect location on the high-temperature superconducting cable to be tested based on the magnetic moment fitting curve formed by the magnetic moment of each magnetic dipole on the high-temperature superconducting cable to be tested and the torsion angle fitting curve formed by the torsion angle of each magnetic dipole.

[0067] In addition, the logic instructions in the above-mentioned memory 730 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on this understanding, the technical solution of the present invention can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0068] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the defect detection method for the high-temperature superconducting cable provided by the above methods, the method including: obtaining the magnetic induction intensity measured by each probe in the probe matrix; wherein all the probes in the probe matrix are evenly distributed on the same circumference, and the circumference surrounds the cross-section of the high-temperature superconducting cable to be tested; the intersection of the radial direction of the circumference where each probe is located and the surface of the high-temperature superconducting cable to be tested is taken as the location of each magnetic dipole; according to the magnetic induction intensity measured by each probe in the probe matrix, the magnetic moment and torsion angle of each magnetic dipole are determined; based on the magnetic moment fitting curve formed by the magnetic moment of each magnetic dipole on the high-temperature superconducting cable to be tested and the torsion angle fitting curve formed by the torsion angle of each magnetic dipole, the defect position on the high-temperature superconducting cable to be tested is determined.

[0069] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which is implemented when the processor executes the defect detection method for the high-temperature superconducting cable provided by the above-mentioned methods, the method comprising: obtaining the magnetic induction intensity measured by each probe in the probe matrix; wherein all the probes in the probe matrix are evenly distributed on the same circumference, and the circumference surrounds the cross-section of the high-temperature superconducting cable to be tested; taking the intersection of the radial direction of the circumference where each probe is located and the surface of the high-temperature superconducting cable to be tested as the location of each magnetic dipole; determining the magnetic moment and torsion angle of each magnetic dipole based on the magnetic induction intensity measured by each probe in the probe matrix; determining the defect position on the high-temperature superconducting cable to be tested based on the magnetic moment fitting curve formed by the magnetic moment of each magnetic dipole on the high-temperature superconducting cable to be tested and the torsion angle fitting curve formed by the torsion angle of each magnetic dipole.

[0070] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0071] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for detecting defects in a high-temperature superconducting cable, characterized in that: include: Acquire the magnetic induction intensity measured by each probe in the probe matrix; wherein all the probes in the probe matrix are evenly distributed on the same circumference, and the circumference surrounds the cross section of the high-temperature superconducting cable to be measured; The intersection of the radial direction of the circle where each probe is located and the surface of the high-temperature superconducting cable to be tested is taken as the location of each magnetic dipole; Determine the magnetic moment and torsion angle of each magnetic dipole according to the magnetic induction intensity measured by each probe in the probe matrix; Based on the magnetic moment fitting curve formed by the magnetic moments of each magnetic dipole on the high-temperature superconducting cable to be tested and the torsion angle fitting curve formed by the torsion angle of each magnetic dipole, the defect position on the high-temperature superconducting cable to be tested is determined.

2. The defect detection method for a high-temperature superconducting cable according to claim 1, characterized in that: Determining the magnetic moment and torsion angle of each magnetic dipole according to the magnetic induction intensity measured by each probe in the probe matrix includes: Taking the center of the probe matrix as the origin and the plane where the probe matrix is ​​located, a plane rectangular coordinate system is constructed; Constructing a regression equation according to the position of each magnetic dipole in the plane rectangular coordinate system, the components of the magnetic moment of the magnetic dipole on the horizontal axis and the vertical axis of the plane rectangular coordinate system, and the magnetic induction intensity measured by the probe corresponding to each magnetic dipole; The magnetic moment of each magnetic dipole in the regression equation is fitted using the least square method to obtain the magnetic moment and torsion angle of each magnetic dipole.

3. The defect detection method for a high temperature superconducting cable according to claim 2, characterized in that: After comparing the magnetic moment and torsion angle of each magnetic dipole with the magnetic moment and torsion angle of the standard magnetic moment and determining the defect position on the high-temperature superconducting cable to be tested according to the comparison result, the method further comprises: The magnetic moment and torsion angle of each magnetic dipole are compared with the standard magnetic moment and standard torsion angle on a standard high-temperature superconducting cable, and the defect position on the high-temperature superconducting cable to be tested is determined according to the comparison result; wherein the standard magnetic moment and the standard torsion angle are standard values ​​pre-measured using the standard high-temperature superconducting cable.

4. The defect detection method for a high temperature superconducting cable according to claim 1, characterized in that: Before obtaining the magnetic induction intensity measured by each probe in the probe matrix, the method includes: After the high-temperature superconducting cable to be tested is subjected to excitation in at least two different directions, the excitation is stopped.

5. The defect detection method for a high temperature superconducting cable according to claim 1, characterized in that: After determining the defect position on the high-temperature superconducting cable to be tested based on the magnetic moment fitting curve formed by the magnetic moments of each magnetic dipole on the high-temperature superconducting cable to be tested and the torsion angle fitting curve formed by the torsion angle of each magnetic dipole, the method further includes: Entering the next time step; wherein the high-temperature superconducting cable to be tested travels a preset distance in the next time step at a preset moving speed; Return to the step of obtaining the magnetic induction intensity measured by each probe in the probe matrix.

6. The defect detection method for a high temperature superconducting cable according to claims 1 to 5, characterized in that: The sampling frequency of the probe matrix is ​​greater than or equal to a preset value.

7. A defect detection device for a high-temperature superconducting cable, characterized in that: include: A magnetic induction intensity acquisition module, used to acquire the magnetic induction intensity measured by each probe in the probe matrix; wherein all the probes in the probe matrix are evenly distributed on the same circumference, and the circumference surrounds the cross section of the high-temperature superconducting cable to be measured; A magnetic dipole position determination module, used to take the intersection of the radial direction of the circle where each probe is located and the surface of the high-temperature superconducting cable to be tested as the location of each magnetic dipole; A magnetic moment calculation module, used to determine the magnetic moment and torsion angle of each magnetic dipole according to the magnetic induction intensity measured by each probe in the probe matrix; The defect position determination module is used to determine the defect position on the high-temperature superconducting cable to be tested based on the magnetic moment fitting curve formed by the magnetic moments of each magnetic dipole on the high-temperature superconducting cable to be tested and the torsion angle fitting curve formed by the torsion angle of each magnetic dipole.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the defect detection method for a high-temperature superconducting cable according to any one of claims 1 to 6 is implemented.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the defect detection method for a high-temperature superconducting cable according to any one of claims 1 to 6 is implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the defect detection method for a high-temperature superconducting cable according to any one of claims 1 to 6 is implemented.

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