Critical current detection system and control method for superconducting tape under pulsed strong magnetic background field

Abstract

The present invention provides a superconducting tape critical current detection system and control method under a pulsed strong magnetic background field, belonging to the technical field of superconducting tape quench detection. The system comprises: a magnetic field intensity acquisition module, a mixed signal oscilloscope, an arbitrary function generator, a drive current source, an analog signal acquisition module, and a control center. The control center is connected to the mixed signal oscilloscope, the arbitrary function generator, and the magnetic field intensity acquisition module, and is configured to set the sampling frequency, number of sampling scans, and sampling accuracy for superconducting tape critical current detection, and to issue control instructions to each module in real time to control the start and stop of the detection process. Utilizing the high-speed synchronous external trigger function of the instrument equipment, a synchronous time compensation is performed between the start time of the external pulse power supply and the moment when the pulsed strong magnetic field reaches the flat-top wave. This eliminates the need to rely on the pulse current generated by the pulsed strong magnetic field for critical current detection, saves the loss caused by multiple experiments, and reduces the risk of damage to the superconducting tape.

Description

Technical Field

[0001] The present invention belongs to the technical field of superconducting tape quench detection, and in particular relates to a superconducting tape critical current detection system and control method under a pulsed strong magnetic background field. Background Art

[0002] Superconducting coils, the core components of superconducting power equipment such as fusion superconducting magnets, superconducting motors, and superconducting fault current limiters, are all wound from superconducting tapes. The operation of the tape in the superconducting state requires critical temperature, critical magnetic field, and critical current as boundary conditions. One of the methods for detecting whether a superconducting tape has quenched is the voltage method, which requires measuring the critical current of the tape operating under a DC steady-state magnetic field. The commonly used detection method is to inject a DC steady-state current into the superconducting tape and continuously adjust the DC source size until the tape quenches. A high-precision critical current reference threshold can guide and improve the utilization rate of superconducting tapes in the field of electrical equipment, effectively reduce equipment costs, and further improve the marketability of superconducting equipment.

[0003] Currently, the high pulse flat-top magnetic field that can support scientific research in the world is above 50 Tesla. With the continuous breakthroughs in pulsed magnetic field technology in strong magnetic laboratories around the world, it is hoped that within a limited pulsed magnetic field flat-top period, the variation law of the critical current value of superconducting tapes under a strong magnetic background field can be studied to help guide the tape design of superconducting equipment under a strong magnetic background field and the setting of protection thresholds related to electrical parameters.

[0004] Under a DC steady-state magnetic field, the critical current detection method for superconducting tapes is to inject a step-type DC current into the tape through an external DC power supply. Since the step-type DC current has the defects of poor control accuracy, slow response time, and inability to synchronize with the flat-top wave period of the pulsed magnetic field, the external DC source detection method is not applicable within the limited flat-top wave period of the pulsed strong magnetic field.

[0005] The existing scheme for detecting the critical current of superconducting tapes under a pulsed magnetic field is to use a pulsed power supply that generates a pulsed magnetic field to synchronously inject a pulsed current into the tape, and conduct multiple exploratory experiments until the tape quench is detected. This multiple-experiment scheme is time-consuming and labor-intensive, has poor detection accuracy, requires sharing the power of the power supply that generates the pulsed magnetic field, and is prone to damage to the tape. Therefore, the traditional superconducting tape critical current detection experiment under a pulsed strong magnetic background field is costly, has a long experimental cycle, and has poor experimental accuracy. Summary of the Invention

[0006] To address these issues, the present invention provides a system and control method for detecting critical current in superconducting tape under a pulsed strong magnetic background field. Leveraging the instrument's built-in high-speed synchronous external triggering function, this method compensates for the time between the start-up of the external pulse power supply and the moment the pulsed strong magnetic field reaches its flat-top peak. This eliminates the need for pulsed current generation to detect critical current, saving the labor and material resources associated with multiple experiments and reducing the high cost of critical current detection and the risk of damage to the superconducting tape.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] The present invention provides a superconducting tape critical current detection system under a pulsed strong magnetic background field, comprising: a magnetic field intensity acquisition module, configured to detect the magnetic field intensity of the superconducting tape; a mixed signal oscilloscope, connected to the magnetic field intensity acquisition module and configured to receive information from the magnetic field intensity acquisition module in real time; an arbitrary function generator, connected to the mixed signal oscilloscope; a driving current source, connected in series with the superconducting tape and receiving a signal from the arbitrary function generator in real time; an analog signal acquisition module, connected in parallel with both ends of the superconducting tape and configured to send a signal of superconducting tape critical current detection to a control center in real time; and a control center, connected to the mixed signal oscilloscope, the arbitrary function generator and the magnetic field intensity acquisition module, configured to set a sampling frequency, a sampling scan number and a sampling accuracy for superconducting tape critical current detection, and to issue control instructions to each module in real time to control the start and stop of a detection process.

[0009] Furthermore, it also includes a low constant temperature module configured to place the superconducting tape.

[0010] Furthermore, the control center is connected to the high-magnetic-field pulse power supply and is configured to send a start or stop discharge instruction to the high-magnetic-field pulse power supply.

[0011] Furthermore, the control center determines the frequency, voltage amplitude and voltage step length of the pulse step square wave based on the duration of the pulse high magnetic field flat-top wave, the rise time of the pulse high magnetic field and the voltage range applied by the driving current source to the superconducting tape.

[0012] Furthermore, the frequency, voltage amplitude and voltage step length of the pulse step square wave are calculated as follows:

[0013] ;

[0014] in, is the voltage amplitude, is the maximum value in the voltage range applied to the superconducting tape, is the minimum value in the voltage range applied to the superconducting tape, is the frequency of the pulse step square wave, The sampling frequency set for the control center, is the voltage step length, is the pulsed strong magnetic field rise time, is the duration of the flat-top wave of the pulsed strong magnetic field, and n is the number of sampling scans of the control center.

[0015] Furthermore, the control center transmits information about the frequency, voltage amplitude and voltage step length of the pulse step square wave to the arbitrary function generator; the arbitrary function generator generates a signal corresponding to the frequency, voltage amplitude and voltage step length of the pulse step square wave.

[0016] Furthermore, the driving current source converts the frequency, voltage amplitude and voltage step length of the pulse step square wave into a current signal.

[0017] The present invention also provides a control method for a critical current detection system of a superconducting tape under a pulsed strong magnetic background field, comprising the following steps: turning on a pulsed strong magnetic field to a target threshold; collecting the duration of a flat-top wave of the pulsed strong magnetic field and the rise time of the pulsed strong magnetic field; determining the frequency, voltage amplitude and voltage step length of a pulsed staircase square wave based on the duration of the flat-top wave of the pulsed strong magnetic field, the rise time of the pulsed strong magnetic field and the voltage range applied to the superconducting tape; converting the frequency, voltage amplitude and voltage step length of the staircase square wave into a current signal and connecting it to the superconducting tape; collecting the voltage signals at both ends of the superconducting tape, and when it is detected that the voltage signal is greater than a preset voltage value, the pulse current corresponding to the pulse voltage signal before the quench is the critical current under the specific pulsed strong magnetic field.

[0018] Furthermore, after the pulsed strong magnetic field is turned on to the target threshold, the background noise information of the superconducting tape is collected; the voltage signals at both ends of the superconducting tape are collected, and denoising is performed based on the background noise information. When it is detected that the voltage signal after denoising is greater than a preset voltage value, the pulse current corresponding to the pulse voltage signal before quenching is the critical current under the specific pulsed strong magnetic field.

[0019] Furthermore, based on the duration of the pulsed high-intensity magnetic field flat-top wave, the rise time of the pulsed high-intensity magnetic field, and the voltage range applied to the superconducting tape, the frequency, voltage amplitude, and voltage step length of the pulsed step square wave are determined, including:

[0020] ;

[0021] in, is the voltage amplitude, is the maximum value in the voltage range applied to the superconducting tape, is the minimum value in the voltage range applied to the superconducting tape, is the frequency of the pulse step square wave, is the set sampling rate, is the voltage step length, is the pulsed strong magnetic field rise time, is the duration of the flat-top wave of the pulsed strong magnetic field, and n is the number of sampling scans.

[0022] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include:

[0023] (1) The present invention proposes that the above technical solution can be used for pulsed strong magnetic background field. It should be pointed out that the field strength of the pulsed strong magnetic background field in the present invention is as high as 50T or above, and the pulse period is at most 100ms. For the pulsed strong magnetic background field, if a pulse power supply that generates a pulsed magnetic field is used to synchronously inject a pulse current into the strip, it is inevitable that during the control process, the same power supply will be controlled separately, resulting in fluctuations in the pulsed strong magnetic background field and current flowing through the superconducting strip, which seriously reduces the detection accuracy and even damages the superconducting strip. The control system proposed by the present invention uses a driving current source BPM to power the superconducting strip, avoiding current fluctuations. Secondly, the detection system proposed by the present invention achieves system simplification and cost reduction under the premise of meeting high detection accuracy and precision under the pulsed strong magnetic background field.

[0024] (2) The present invention can accurately detect the critical current of the superconducting tape under a pulsed strong magnetic background field through the above method, with high detection accuracy and efficiency, and the accuracy of the critical current value meets the requirement of 0.5 ten thousandths. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. 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 creative work.

[0026] Figure 1 Schematic diagram of the structure of the superconducting tape critical current detection system under a pulsed strong magnetic background field in Example 1 of the present invention;

[0027] Figure 2 This is a voltage-time diagram of the superconducting tape at both ends under a pulsed strong magnetic background field in Example 1 of the present invention;

[0028] Figure 3 This is a current-time diagram at both ends of the superconducting tape under a pulsed strong magnetic background field in Example 1 of the present invention. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0032] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0034] Example 1

[0035] The embodiment of the present invention discloses a superconducting tape critical current detection system under a pulsed strong magnetic background field. Figure 1As shown, the system comprises: a magnetic field acquisition module GM configured to detect the magnetic field intensity of the superconducting tape; a mixed signal oscilloscope (MSO) connected to the magnetic field acquisition module and configured to receive information from the magnetic field acquisition module in real time; an arbitrary function generator (AFG) connected to the mixed signal oscilloscope; a driving current source (BPM) connected in series with the superconducting tape and receiving signals from the arbitrary function generator in real time; an analog signal acquisition module (AFE) connected in parallel with both ends of the superconducting tape and configured to send signals for superconducting tape critical current detection to a control center in real time; and a control center (OCC) connected to the mixed signal oscilloscope, the arbitrary function generator, and the magnetic field acquisition module and configured to set the sampling frequency, sampling scan number, and sampling accuracy for superconducting tape critical current detection, and to issue control instructions to each module in real time to control the start and stop of the detection process. The external trigger port Aux_out of the mixed signal oscilloscope (MSO) is connected to the arbitrary function generator (AFG).

[0036] The present invention proposes that the above-mentioned technical solution can be used for pulsed strong magnetic background fields. It should be pointed out that the field strength of the pulsed strong magnetic background field in the present invention is as high as 50T or above, and the pulse period is at most 100ms. For the pulsed strong magnetic background field, if a pulse power supply that generates a pulsed magnetic field is used to synchronously inject a pulse current into the strip, it is unavoidable that during the control process, the same power supply is controlled separately, resulting in fluctuations in the pulsed strong magnetic background field and current flowing through the superconducting strip, which seriously reduces the detection accuracy and even damages the superconducting strip; secondly, in the pulsed strong magnetic background field, a slight current fluctuation causes a drastic change in the field strength, and the fluctuating field strength seriously affects the use of the product. The control system proposed by the present invention adopts a driving current source BPM to power the superconducting strip, thereby avoiding current fluctuations; thirdly, the detection system proposed by the present invention achieves system simplification and cost reduction under the premise of meeting high detection accuracy and precision under the pulsed strong magnetic background field.

[0037] It should be pointed out that the superconducting tape in the present invention can be a first-generation or second-generation high-temperature superconducting tape, such as BSCCO or YBCO, and the detection method in the present invention does not limit the type of superconducting tape. The magnetic field strength acquisition module GM, specifically, such as a gaussmeter, is purchased from a commercial source and must meet the requirements for detecting the pulsed strong magnetic field proposed in this application. An accuracy of 1% can meet the measurement accuracy requirements. The magnetic field strength acquisition module is placed near the superconducting tape, for example, within a distance range of 2-10mm from the superconducting tape. As long as the measured magnetic field intensity is the same or approximately the same as the magnetic field intensity at the location of the superconducting tape, the approximately the same means that the deviation of the magnetic field size does not exceed 1%; the mixed signal oscilloscope MSO and the arbitrary function generator AFG are purchased from commercial sources. The arbitrary function generator AFG is an arbitrary waveform generator; the driving current source BPM is a high-band The wide bipolar drive current source module can be a commercially available product, as long as it meets the minimum supported input voltage (-1.75V, 1.75V) and the minimum output current of 10A; the BPM in the present invention supports a maximum input voltage of -1.75V~1.75V; the analog signal acquisition module AFE is used to collect the voltage signals at both ends of the superconducting tape at high frequency. The sampling frequency of the AFE used in the present invention is at least 1MHz; the control center OCC has a CPU and a memory chip, and the memory chip stores a control program to control the normal operation of the detection system. The CPU can execute the control program so that each module is executed in sequence according to the control program.

[0038] Preferably, the superconducting tape critical current detection system under a pulsed strong magnetic background field further includes a low constant temperature module configured to place the superconducting tape so that the superconducting tape is below the critical temperature to achieve superconductivity.

[0039] Preferably, the control center is connected to the high-magnetic-field pulse power supply and is configured to send a start or stop discharge instruction to the high-magnetic-field pulse power supply. It should be noted that the control center in the present invention only sends instructions to the high-magnetic-field pulse power supply to control the opening and closing of the high-magnetic-field pulse power supply. The high-magnetic-field pulse power supply may not be controlled by the control center, but connecting the control center to the high-magnetic-field pulse power supply improves the integration of the detection system and the automation of the detection.

[0040] Preferably, the control center determines the frequency, voltage amplitude, and voltage step length of the pulsed staircase square wave based on the duration of the pulsed high-intensity magnetic field flat-top wave, the pulsed high-intensity magnetic field rise time, and the voltage range applied to the superconducting tape by the driving current source. After the control center OCC sends a discharge start instruction to the high-intensity magnetic field pulse power supply, the pulsed magnetic field intensity gradually rises to a flat-top wave, and the magnetic field intensity acquisition module GM receives the instruction from the control center OCC to detect the magnetic field intensity.

[0041] In the embodiment of the present invention, the control center OCC sets the sampling to the immediate trigger mode and sets the sampling frequency The sampling frequency is at least 1 MHz, the number of sampling scans n is set, and the sampling accuracy is microvolt-level. The control center (OCC) sends an instruction to the high-speed analog signal acquisition module (AFE) to collect superconducting tape noise floor information. This noise floor information can be the average voltage, the maximum voltage, or any value between the average and maximum voltages. It should be noted that collecting superconducting tape noise floor information is the preferred embodiment. While not collecting superconducting tape noise floor information can still achieve the objectives of the present invention, it will result in reduced accuracy of the detection results.

[0042] The mixed signal oscilloscope MSO records the pulsed strong magnetic field detection signal sent by the magnetic field intensity acquisition module GM, and sends the pulsed strong magnetic field recording data to the control center OCC, which records the duration of the pulsed strong magnetic field flat-top wave. , record the pulse strong magnetic field rise time .

[0043] The control center OCC determines the duration of the pulsed strong magnetic field flat-top wave , pulsed strong magnetic field rise time and the input range of the driving current source BPM ( , ), set the frequency, voltage amplitude and voltage step length of the pulse step square wave output by the arbitrary function generator AFG. The frequency of the pulse step square wave , voltage amplitude and voltage step size The calculation method is:

[0044] ;

[0045] in, is the voltage amplitude, is the maximum value in the voltage range applied to the superconducting tape, is the minimum value in the voltage range applied to the superconducting tape, is the frequency of the pulse step square wave, The sampling frequency set for the control center, is the voltage step length, is the pulsed strong magnetic field rise time, is the duration of the flat-top wave of the pulsed strong magnetic field, and n is the number of sampling scans of the control center.

[0046] Preferably, the control center OCC changes the frequency of the pulse step square wave to , voltage amplitude and voltage step size The information is transmitted to the arbitrary function generator AFG; the arbitrary function generator AFG generates a signal corresponding to the frequency, voltage amplitude and voltage step length of the pulse step square wave. Specifically, the control center OCC sends a detection instruction to the mixed signal oscilloscope MSO to set the target threshold B of the target pulse magnetic field strength. max When the mixed signal oscilloscope (MSO) detects that the magnetic field intensity B at the center of the superconducting tape in the low constant temperature module (LCM) reaches the target threshold value B max When the mixed signal oscilloscope MSO releases an instantaneous external trigger start signal to the arbitrary function generator AFG through the external trigger output interface Aux_out, the arbitrary function generator immediately sends a frequency of f to the driving current source BPM. pluse , the step length is ΔU pluse , the amplitude is U pluse The step pulse voltage signal.

[0047] Preferably, the driving current source converts the frequency, voltage amplitude and voltage step length of the pulse step square wave into a current signal. The driving current source BPM converts the high-frequency step pulse voltage signal into an effective current signal and connects it to the superconducting tape for critical current detection.

[0048] The analog signal acquisition module AFE uses the sampling frequency set by the control center OCC Real-time acquisition of the microvolt voltage signal U at both ends of a superconducting tape with a length of L L ,like Figure 2 As shown, the voltage signal at both ends of the superconducting tape is sent to the control center OCC in real time. Optionally, when the above steps collect the background noise information, the voltage data can be subjected to background noise removal. The background noise information can be represented by µ. When the voltage signal U after background noise removal is detected, L -µ is greater than the preset voltage value U d When , it proves that the superconducting tape has quenched, and the high-frequency step pulse voltage signal U corresponding to the step length before the superconducting tape quenches is recorded. L-1 , then the high-frequency step pulse voltage signal U is defined as L-1 Pulse step current I L-1 The superconducting tape is subjected to the flat-top wave B in the pulsed strong magnetic background field. max The critical current under Figure 3 shown.

[0049] The embodiment of the present invention further provides a preferred data processing method, which specifically includes:

[0050] The microvolt voltage signal U at both ends of the superconducting tape is monitored. L Perform fitting and obtain the fitting curve L U , calculate the fitting curve L U The derivative dLU , when dL U When it is greater than the first preset value, the sampling frequency is adjusted. The specific adjustment algorithm is:

[0051] ;

[0052] in, is the corrected sampling frequency, is the correction coefficient, which is 1.0-1.2 in the embodiment of the present invention. is the fitting curve L U The derivative value at time t, dL U The derivative value at the moment when it is greater than the first preset value, The maximum acquisition frequency of the analog signal acquisition module AFE, The maximum allowed acquisition frequency of the control center OCC.

[0053] The first preset value is calculated by: d Substitute the fitting curve L U , calculate dL U，d , the first preset value dL U，o =γdL U，d , the value range of γ is 2 / 3~4 / 5.

[0054] Based on calculation , the frequency of the pulse step square wave , voltage amplitude and voltage step size Recalculate, the calculation method is:

[0055] ;

[0056] The sampling frequency is obtained by the above calculation method. When U L -When µ is greater than the second preset value, that is, U d , it proves that the superconducting tape has quenched, and the high-frequency step pulse voltage signal U corresponding to the step length before the superconducting tape quenches is recorded. L-1 , then the high-frequency step pulse voltage signal U is defined as L-1 Pulse step current I L-1 The superconducting tape is subjected to the flat-top wave B in the pulsed strong magnetic background field. max The critical current below.

[0057] By using the above calculation method, the sampling frequency and the input signal of the arbitrary function generator AFG are adaptively adjusted, so that the monitored critical current is more accurate.

[0058] Example 2

[0059] An embodiment of the present invention provides a control method for a critical current detection system of a superconducting tape under a pulsed strong magnetic background field, comprising the following steps: S1, turning on a pulsed strong magnetic field to a target threshold; S2, collecting the duration of a flat-top wave of the pulsed strong magnetic field and the rise time of the pulsed strong magnetic field; S3, determining the frequency, voltage amplitude and voltage step length of a pulsed step square wave based on the duration of the flat-top wave of the pulsed strong magnetic field, the rise time of the pulsed strong magnetic field and the voltage range applied to the superconducting tape; S4, converting the frequency, voltage amplitude and voltage step length of the step square wave into a current signal, and connecting it to the superconducting tape; S5, collecting the voltage signals at both ends of the superconducting tape, and when it is detected that the voltage signal is greater than a preset voltage value, the pulse current corresponding to the pulse voltage signal before the quench is the critical current under the specific pulsed strong magnetic field.

[0060] The control method of this embodiment is implemented based on the detection system. The above control strategy is stored in the storage medium. After being executed by the CPU, the corresponding module is controlled to perform the detection task according to the preset process and steps. The present invention can accurately detect the critical current of the superconducting tape under the pulsed strong magnetic background field through the above method, with high detection accuracy and efficiency.

[0061] Preferably, the method further includes: collecting background noise information of the superconducting tape after turning on the pulsed strong magnetic field to the target threshold; collecting the voltage signals at both ends of the superconducting tape, and performing background noise removal based on the background noise information. When it is detected that the voltage signal after background noise removal is greater than a preset voltage value, the pulse current corresponding to the pulse voltage signal before quenching is the critical current under the specific pulsed strong magnetic field. Specifically, the background noise information can be represented by µ. When the voltage signal after background noise removal is detected, U L -µ is greater than the preset voltage value U d When , it proves that the superconducting tape has quenched, and the high-frequency step pulse voltage signal U corresponding to the step length before the superconducting tape quenches is recorded. L-1 , then the high-frequency step pulse voltage signal U is defined as L-1 Pulse step current I L-1 The superconducting tape is subjected to the flat-top wave B in the pulsed strong magnetic background field. max The critical current below.

[0062] Preferably, determining the frequency, voltage amplitude and voltage step length of the pulsed step square wave based on the duration of the pulsed high magnetic field flat-top wave, the rise time of the pulsed high magnetic field and the voltage range applied to the superconducting tape includes:

[0063] ;

[0064] in, is the voltage amplitude, is the maximum value in the voltage range applied to the superconducting tape, is the minimum value in the voltage range applied to the superconducting tape, is the frequency of the pulse step square wave, is the set sampling rate, is the voltage step length, is the pulsed strong magnetic field rise time, is the duration of the flat-top wave of the pulsed strong magnetic field, and n is the number of sampling scans.

[0065] An embodiment of the present application also provides an electronic device, such as a control center, comprising one or more processors; a memory on which one or more programs are stored, and when the one or more programs are executed by the one or more processors, the one or more processors implement the above-mentioned control method.

[0066] The electronic device in the present application may include one or more of the following components: a memory, a processor, and one or more applications, wherein the one or more applications may be stored in the memory and configured to be executed by one or more processors, and the one or more programs are configured to execute the method described in the aforementioned method embodiment.

[0067] The memory may include random access memory (RAM) or read-only memory (ROM). The memory may be used to store instructions, programs, code, code sets, or instruction sets. The memory may include a program storage area and a data storage area. The program storage area may store instructions for implementing an operating system, instructions for implementing at least one function (such as a histogram equalization function), and instructions for implementing the various method embodiments described above. The data storage area may also store data generated by the electronic device during use (such as image matrix data).

[0068] A processor may include one or more processing cores. The processor utilizes various interfaces and circuits to connect various components within the electronic device. It executes instructions, programs, code sets, or instruction sets stored in memory, and accesses data stored in memory to perform various functions and process data. Optionally, the processor can be implemented in hardware using at least one of the following: a digital signal processing (DSP), a field-programmable gate array (FPGA), or a programmable logic array (PLA). The processor may integrate one or a combination of a central processing unit (CPU) and a modem. The CPU primarily processes the operating system and application programs, while the modem handles wireless communications. It is understood that the modem may not be integrated into the processor and may instead be implemented as a separate communications chip.

[0069] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the components and steps of each example according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0070] Example 3

[0071] In the embodiment of the present invention, the driving current source BPM supports a maximum input voltage of (-1.75V, 1.75V), has a maximum output current of 35A, a pulsed strong magnetic field flat-top wave cycle time of 100 ms, and an analog signal acquisition module AFE sampling frequency of 1 MHz. By calculation, assuming that the number of critical current detection scanning step waveforms is 1, the frequency of the step-type pulse voltage signal emitted by the arbitrary function generator AFG to the driving current source BPM can be set to 20KHz, the step size is set to 0.001V, and the amplitude is set to 1.75V. The minimum current range output by the bipolar driving current source BMP is 0.015A, and the corresponding critical current value accuracy meets the requirement of 0.5 ten-thousandths.

[0072] 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 principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A superconducting tape critical current detection system under a pulsed strong magnetic background field, characterized in that: include: a magnetic field strength acquisition module, configured to detect the magnetic field strength in which the superconducting tape is located; a mixed signal oscilloscope, connected to the magnetic field strength acquisition module and configured to receive information from the magnetic field strength acquisition module in real time; An arbitrary function generator connected to the mixed signal oscilloscope; a driving current source, the driving current source being connected in series with the superconducting tape and receiving a signal from the arbitrary function generator in real time; an analog signal acquisition module, connected in parallel to both ends of the superconducting tape and configured to send a signal detecting the critical current of the superconducting tape to a control center in real time; A control center, connected to the mixed signal oscilloscope, arbitrary function generator, and magnetic field intensity acquisition module, is configured to set the sampling frequency, number of sampling scans, and sampling accuracy of superconducting tape critical current detection, issue control instructions to each module in real time, and control the start and stop of the detection process; The control center determines the frequency, voltage amplitude and voltage step length of the pulse step square wave based on the duration of the pulse high magnetic field flat-top wave, the rise time of the pulse high magnetic field and the voltage range applied to the superconducting tape by the driving current source; The control center transmits information about the frequency, voltage amplitude, and voltage step length of the pulse step square wave to the arbitrary function generator; The arbitrary function generator generates a signal corresponding to the frequency, voltage amplitude and voltage step length of the pulse step square wave; The driving current source converts the pulse step square wave into a current signal based on the frequency, voltage amplitude and voltage step length.

2. The superconducting tape critical current detection system under a pulsed strong magnetic background field according to claim 1 is characterized in that: Also included is a low constant temperature module configured to place the superconducting tape.

3. The superconducting tape critical current detection system under a pulsed strong magnetic background field according to claim 1 is characterized in that: The control center is connected to the high-magnetic-field pulse power supply and is configured to send a start or stop discharge instruction to the high-magnetic-field pulse power supply.

4. The superconducting tape critical current detection system under a pulsed strong magnetic background field according to claim 1 is characterized in that: The frequency, voltage amplitude and voltage step length of the pulse step square wave are calculated as follows: Among them, U pluse is the voltage amplitude, U max is the maximum value in the voltage range applied to the superconducting tape, U min is the minimum value in the voltage range applied to the superconducting tape, f pluse is the frequency of the pulse step square wave, f set is the sampling frequency set by the control center, ΔU pluse is the voltage step length, T rise is the pulsed strong magnetic field rise time, T flat-top is the duration of the flat-top wave of the pulsed strong magnetic field, and n is the number of sampling scans of the control center.

5. A control method for a superconducting tape critical current detection system under a pulsed strong magnetic background field, characterized in that: The steps include: Turn on the pulsed strong magnetic field to the target threshold; Collect the duration of the pulsed high-intensity magnetic field flat-top wave and the rise time of the pulsed high-intensity magnetic field; Determining the frequency, voltage amplitude, and voltage step length of the pulsed step square wave based on the duration of the pulsed high-intensity magnetic field flat-top wave, the rise time of the pulsed high-intensity magnetic field, and the voltage range applied to the superconducting tape; The frequency, voltage amplitude and voltage step length of the step square wave are converted into a current signal and connected to the superconducting tape; The voltage signals at both ends of the superconducting tape are collected. When it is detected that the voltage signal is greater than a preset voltage value, the pulse current corresponding to the pulse voltage signal before the quench is the critical current under a specific pulsed strong magnetic field.

6. The control method according to claim 5, characterized in that: Also includes: After turning on the pulsed high magnetic field to a target threshold, collecting background noise information of the superconducting tape; The voltage signals at both ends of the superconducting tape are collected, and denoising is performed based on the background noise information. When it is detected that the voltage signal after denoising is greater than a preset voltage value, the pulse current corresponding to the pulse voltage signal before quenching is the critical current under a specific pulsed strong magnetic field.

7. The control method according to claim 5, characterized in that: Determining the frequency, voltage amplitude, and voltage step length of the pulsed step square wave based on the duration of the pulsed high-intensity magnetic field flat-top wave, the rise time of the pulsed high-intensity magnetic field, and the voltage range applied to the superconducting tape includes: Among them, U pluse is the voltage amplitude, U max is the maximum value in the voltage range applied to the superconducting tape, U min is the minimum value in the voltage range applied to the superconducting tape, f pluse is the frequency of the pulse step square wave, f set is the set sampling rate, ΔU pluse is the voltage step length, T rise is the pulsed strong magnetic field rise time, T flat-top is the duration of the flat-top wave of the pulsed strong magnetic field, and n is the number of sampling scans.

Images