Quench detection method for low-temperature superconducting magnets based on strain signals

Abstract

The present invention provides a strain signal-based method for detecting a quench in a low-temperature superconducting magnet. The method utilizes strain signal data of a superconducting magnet within a preset time period before the detection moment to obtain a first determination moment and a second determination moment respectively through parallel logic. The method then determines whether the superconducting magnet has quenched based on the first determination moment and the second determination moment. If the superconducting magnet has quenched, the quench moment of the superconducting magnet is obtained. By measuring physical signals, the present invention can perform quench detection on both multi-coil superconducting magnets and single-coil superconducting magnets. The method also avoids measurement delays, improves detection speed, reduces detection costs and space requirements for detection sensors, and, at the same time, makes physical signal acquisition and transmission more reliable and applicable to long-distance transmission, enabling remote control. The present invention can solve the technical problem in the prior art that the superconducting magnet quench detection method cannot detect the magnet quench moment in a timely manner.

Description

Technical Field

[0001] The present invention relates to the technical field of low-temperature superconducting magnet quench detection, and in particular to a low-temperature superconducting magnet quench detection method based on strain signals. Background Art

[0002] Superconducting wires made of cryogenic metals exhibit zero resistance at extremely low temperatures, playing a crucial role in technologies and engineering applications requiring high currents and strong magnetic fields. Exciting superconducting coils wound from superconducting wire with high currents creates superconducting magnets with strong magnetic field characteristics.

[0003] Superconducting magnets, with their ability to provide strong magnetic fields and strong magnetic forces, have been widely used in medical equipment, magnetic levitation transportation, and military applications. Superconducting magnets used in magnetic levitation transportation often operate in highly dynamic environments, such as strong vibrations and high electromagnetic excitation. High-dynamic superconducting magnets often carry a certain risk of quenching. When a superconducting magnet quenches, it loses its superconducting state and its strong electromagnetic force, severely impacting the stable operation of itself and surrounding equipment. Therefore, effectively and rapidly detecting the quenching moment of a high-dynamic single-coil low-temperature superconducting magnet and rapidly shutting down the operating equipment are crucial to its safe operation.

[0004] Currently, there are three main ways to measure the quench of a superconducting magnet:

[0005] (1) Measure the voltage of the superconducting magnet. When the superconducting magnet quenches, its quench voltage can be measured. Therefore, it is possible to determine whether it has quenched by measuring the voltage.

[0006] (2) Magnetic field measurement of superconducting magnets. After a superconducting magnet quenches, the strong magnetic field it generates will drop rapidly. Therefore, magnetic field measurement can be used to determine whether it has quenched.

[0007] (3) Measure the temperature of the superconducting magnet. When the superconducting magnet quenches, it will release energy and generate a large amount of heat. The temperature of the coil will rise significantly, so the temperature can be used to determine whether the coil has quenched.

[0008] However, the above three methods all have certain limitations and cannot detect the quench moment of the superconducting magnet in a timely manner. The specific disadvantages are as follows:

[0009] (1) Voltage measurement

[0010] Voltage measurement can quickly detect the coil's quench voltage in superconducting magnets with multiple coils connected in series. However, in single-coil superconducting magnets, because the voltage signal line is short-circuited by the superconducting switch, after the magnet quenches, the quench point is transmitted to the superconducting switch, and the superconducting switch is also quenched before the voltage signal line can detect the coil's quench voltage. Therefore, for high-dynamic single-coil superconducting magnets, voltage signal measurement can delay magnet quench detection and may even fail to detect the quench voltage.

[0011] (2) Magnetic field measurement

[0012] Magnetic field measurement can meet the requirements for quench detection in most superconducting magnets. However, for highly dynamic superconducting magnets, there is often limited external space for mounting Hall sensors, transmitters, and signal transmission cables. Furthermore, after a superconducting magnet quenches, its magnetic field decreases gradually in the initial stages of the quench, which makes it difficult to accurately and promptly detect quenches in superconducting magnets.

[0013] (3) Temperature measurement

[0014] The temperature measurement method is unaffected by whether the superconducting magnet is a single coil or whether it is in a highly dynamic environment. However, temperature measurement has two drawbacks: First, a quench in a superconducting magnet is often triggered by a single point and then spreads throughout the coil. Temperature measurement can only be performed at a few points within the magnet. Therefore, if a quench occurs in a superconducting magnet coil far from the temperature measurement point, the temperature measurement method has poor timeliness for quench detection. Second, the temperature sensor is bonded to the superconducting coil. After a quench, the temperature rise in the superconducting coil is transferred to the temperature sensor, which in turn affects the sensor's measurement sensitivity. This also results in poor timeliness for temperature measurement. Summary of the Invention

[0015] The present invention provides a strain signal-based low-temperature superconducting magnet quench detection method, which can solve the technical problem that the superconducting magnet quench detection method in the prior art cannot detect the magnet quench moment in time.

[0016] According to one aspect of the present invention, a method for detecting a quench in a low-temperature superconducting magnet based on a strain signal is provided, the method comprising:

[0017] S10, at the current time T i As the detection moment, obtain the strain signal data of the superconducting magnet in a preset time period before the detection moment, and simultaneously go to S20 and S40;

[0018] S20, obtaining a frequency component of the superconducting magnet corresponding to each moment in the preset time period before the detection moment based on the strain signal data of the superconducting magnet in the preset time period before the detection moment;

[0019] S30, respectively calculating the energy of the frequency components of the superconducting magnet corresponding to each moment that has a frequency less than a preset frequency, obtaining a ratio of the energy of the frequency components of the superconducting magnet corresponding to each moment that has a frequency less than the preset frequency to the total energy of all frequencies in the frequency components of the superconducting magnet corresponding to the corresponding moment, and proceeding to S60;

[0020] S40, performing low-pass filtering on the strain signal data of the superconducting magnet within a preset time period before the detection moment to obtain a low-pass filtered signal of the superconducting magnet;

[0021] S50, obtaining a maximum value and a root mean square value of a low-pass filtered signal of a superconducting magnet;

[0022] S60, determining whether all ratios of the energy of the frequency components of the superconducting magnet corresponding to each moment that has a frequency lower than the preset frequency to the total energy of all frequencies in the frequency components of the superconducting magnet corresponding to the corresponding moment are less than or equal to a preset percentage, and at the same time determining whether the ratio of the maximum value to the root mean square of the low-pass filtered signal of the superconducting magnet is less than a preset threshold. If both are yes, then at the next moment T i+1 As the detection moment, obtain the strain signal data of the superconducting magnet in a preset time period before the detection moment, and simultaneously go to S20 and S40, otherwise go to S70;

[0023] S70. If at least one of the ratios of the energy of the frequency components of the superconducting magnet corresponding to each moment that has a frequency lower than a preset frequency to the total energy of all frequencies in the frequency components of the superconducting magnet corresponding to the corresponding moment is greater than a preset percentage, and the ratio of the maximum value of the low-pass filtered signal of the superconducting magnet to the root mean square is less than a preset threshold, determine that the superconducting magnet is quenched, and use the determination moment as the quench moment of the superconducting magnet. If there is only one ratio greater than the preset percentage, the moment T corresponding to the ratio greater than the preset percentage is used as the quench moment of the superconducting magnet. k As the determination time, if there are multiple ratios greater than the preset percentage, the earliest time T among the multiple times corresponding to the multiple ratios greater than the preset percentage is used. k As a moment of judgment;

[0024] If all ratios of the energy of the frequency component of the superconducting magnet corresponding to each moment that is less than the preset frequency to the total energy of all frequencies in the frequency component of the superconducting magnet corresponding to the corresponding moment are less than or equal to the preset percentage, and the ratio of the maximum value of the low-pass filtered signal of the superconducting magnet to the root mean square is greater than or equal to the preset threshold, it is determined that the superconducting magnet is quenched, and the time T corresponding to the maximum value of the low-pass filtered signal of the superconducting magnet is set as j As the quench moment of a superconducting magnet;

[0025] If at least one of the ratios of the energy of the frequency components of the superconducting magnet corresponding to each moment that has a frequency lower than the preset frequency to the total energy of all frequencies in the frequency components of the superconducting magnet corresponding to the corresponding moment is greater than a preset percentage, and the ratio of the maximum value to the root mean square of the low-pass filtered signal of the superconducting magnet is greater than or equal to a preset threshold, it is determined that the superconducting magnet is quenched, and based on the determination time T k The time T corresponding to the maximum value of the low-pass filter signal of the superconducting magnet j Obtain the quench moment of the superconducting magnet.

[0026] Preferably, in S10, the current time T i As the detection moment, obtaining the strain signal data of the superconducting magnet in the preset time period before the detection moment includes: taking the current moment T i As the detection time, get the i -△T time to T i The strain signal data of the superconducting magnet in the time period, where the value range of △T is 10~50ms.

[0027] Preferably, in S20, obtaining the frequency components of the superconducting magnet corresponding to each moment in the preset time period before the detection moment based on the strain signal data of the superconducting magnet in the preset time period before the detection moment includes: performing a discrete wavelet transform on the strain signal data of the superconducting magnet in the preset time period before the detection moment to obtain the frequency components of the superconducting magnet corresponding to each moment in the preset time period before the detection moment.

[0028] Preferably, in S30, the preset frequency ranges from 10 to 50 Hz.

[0029] Preferably, in S60, the preset percentage ranges from 50 to 90%.

[0030] Preferably, in S60, the preset threshold value ranges from 10 to 20.

[0031] Preferably, in S70, when at least one of the ratios of the energy of the frequency components of the superconducting magnet corresponding to each moment having a frequency lower than a preset frequency to the total energy of all frequencies in the frequency components of the superconducting magnet corresponding to the corresponding moment is greater than a preset percentage, and when the ratio of the maximum value to the root mean square of the low-pass filtered signal of the superconducting magnet is greater than or equal to a preset threshold, the quenching moment of the superconducting magnet is obtained by the following formula:

[0032] T Qch =(T k +T j ) / 2;

[0033] Where, T Qch is the quenching moment of the superconducting magnet, Tk is the judgment time, T j is the time corresponding to the maximum value of the low-pass filtered signal of the superconducting magnet.

[0034] According to another aspect of the present invention, a computer device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any of the above methods when executing the computer program.

[0035] By applying the technical solution of the present invention, the strain signal data of the superconducting magnet in a preset time period before the detection moment is used to obtain the first judgment moment and the second judgment moment respectively through parallel logic, and whether the superconducting magnet is quenched is judged according to the first judgment moment and the second judgment moment. In the case of a quench in the superconducting magnet, the quench moment of the superconducting magnet is obtained. The present invention can realize quench detection of multi-coil superconducting magnets and quench detection of single-coil superconducting magnets by measuring physical signals, and also avoids measurement delay, improves detection speed, reduces detection cost and space requirements of detection sensors, and is applicable to small or compact superconducting magnets. At the same time, the physical signal acquisition and transmission are more reliable, and are applicable to long-distance transmission to realize remote control. The present invention adopts parallel logic to obtain the first judgment moment and the second judgment moment respectively, thereby improving detection sensitivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings are included to provide a further understanding of the embodiments of the present invention, constitute a part of the specification, illustrate the embodiments of the present invention, and together with the description, explain the principles of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0037] Figure 1 A flow chart of a method for detecting a quench in a low-temperature superconducting magnet based on a strain signal according to an embodiment of the present invention is shown;

[0038] Figure 2 A schematic diagram of a low-temperature superconducting magnet quench detection method based on strain signals according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0039] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in 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. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0040] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0041] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0042] like Figure 1 As shown, the present invention provides a method for detecting a quench in a low-temperature superconducting magnet based on a strain signal, the method comprising:

[0043] S10, at the current time T i As the detection moment, obtain the strain signal data of the superconducting magnet in a preset time period before the detection moment, and simultaneously go to S20 and S40;

[0044] S20, obtaining a frequency component of the superconducting magnet corresponding to each moment in the preset time period before the detection moment based on the strain signal data of the superconducting magnet in the preset time period before the detection moment;

[0045] S30, respectively calculating the energy of the frequency components of the superconducting magnet corresponding to each moment that has a frequency less than a preset frequency, obtaining a ratio of the energy of the frequency components of the superconducting magnet corresponding to each moment that has a frequency less than the preset frequency to the total energy of all frequencies in the frequency components of the superconducting magnet corresponding to the corresponding moment, and proceeding to S60;

[0046] S40, performing low-pass filtering on the strain signal data of the superconducting magnet within a preset time period before the detection moment to obtain a low-pass filtered signal of the superconducting magnet;

[0047] S50, obtaining a maximum value and a root mean square value of a low-pass filtered signal of a superconducting magnet;

[0048] S60, determining whether all ratios of the energy of the frequency components of the superconducting magnet corresponding to each moment that has a frequency lower than the preset frequency to the total energy of all frequencies in the frequency components of the superconducting magnet corresponding to the corresponding moment are less than or equal to a preset percentage, and at the same time determining whether the ratio of the maximum value to the root mean square of the low-pass filtered signal of the superconducting magnet is less than a preset threshold. If both are yes, then at the next moment T i+1 As the detection moment, obtain the strain signal data of the superconducting magnet in a preset time period before the detection moment, and simultaneously go to S20 and S40, otherwise go to S70;

[0049] S70. If at least one of the ratios of the energy of the frequency components of the superconducting magnet corresponding to each moment that has a frequency lower than a preset frequency to the total energy of all frequencies in the frequency components of the superconducting magnet corresponding to the corresponding moment is greater than a preset percentage, and the ratio of the maximum value of the low-pass filtered signal of the superconducting magnet to the root mean square is less than a preset threshold, determine that the superconducting magnet is quenched, and use the determination moment as the quench moment of the superconducting magnet. If there is only one ratio greater than the preset percentage, the moment T corresponding to the ratio greater than the preset percentage is used as the quench moment of the superconducting magnet. k As the determination time, if there are multiple ratios greater than the preset percentage, the earliest time T among the multiple times corresponding to the multiple ratios greater than the preset percentage is used. k As a moment of judgment;

[0050] If all ratios of the energy of the frequency component of the superconducting magnet corresponding to each moment that is less than the preset frequency to the total energy of all frequencies in the frequency component of the superconducting magnet corresponding to the corresponding moment are less than or equal to the preset percentage, and the ratio of the maximum value of the low-pass filtered signal of the superconducting magnet to the root mean square is greater than or equal to the preset threshold, it is determined that the superconducting magnet is quenched, and the time T corresponding to the maximum value of the low-pass filtered signal of the superconducting magnet is set as j As the quench moment of a superconducting magnet;

[0051] If at least one of the ratios of the energy of the frequency components of the superconducting magnet corresponding to each moment that has a frequency lower than the preset frequency to the total energy of all frequencies in the frequency components of the superconducting magnet corresponding to the corresponding moment is greater than a preset percentage, and the ratio of the maximum value to the root mean square of the low-pass filtered signal of the superconducting magnet is greater than or equal to a preset threshold, it is determined that the superconducting magnet is quenched, and based on the determination time T k The time T corresponding to the maximum value of the low-pass filter signal of the superconducting magnet j Obtain the quench moment of the superconducting magnet.

[0052] The present invention utilizes the strain signal data of the superconducting magnet in a preset time period before the detection moment to obtain the first judgment moment and the second judgment moment respectively through parallel logic, and judges whether the superconducting magnet is quenched according to the first judgment moment and the second judgment moment. In the case of the superconducting magnet being quenched, the quench moment of the superconducting magnet is obtained. The present invention can realize quench detection of multi-coil superconducting magnets and quench detection of single-coil superconducting magnets by measuring physical signals, and also avoids measurement delay, improves detection speed, reduces detection cost and space requirements of detection sensors, and is applicable to small or compact superconducting magnets. At the same time, physical signal acquisition and transmission are more reliable, and are applicable to long-distance transmission to realize remote control. The present invention adopts parallel logic to obtain the first judgment moment and the second judgment moment respectively, thereby improving detection sensitivity.

[0053] According to an embodiment of the present invention, in S10, the current time T i As the detection moment, obtaining the strain signal data of the superconducting magnet in the preset time period before the detection moment includes: taking the current moment T i As the detection time, get the i -△T time to T i The strain signal data of the superconducting magnet in the time period, where the value range of △T is 10~50ms.

[0054] By setting the value range of ΔT as described above, inaccurate measurement results due to overly large values are avoided, and reduced measurement speed due to overly small values is avoided.

[0055] According to one embodiment of the present invention, in S20, obtaining the frequency components of the superconducting magnet corresponding to each moment in the preset time period before the detection moment based on the strain signal data of the superconducting magnet in the preset time period before the detection moment includes: performing a discrete wavelet transform on the strain signal data of the superconducting magnet in the preset time period before the detection moment to obtain the frequency components of the superconducting magnet corresponding to each moment in the preset time period before the detection moment.

[0056] According to one embodiment of the present invention, in S30, the preset frequency has a value range of 10 to 50 Hz. In S30, if at each moment there is a frequency less than the preset frequency in the frequency components of the superconducting magnet, the ratio of the energy corresponding to the frequency to the total energy of all frequencies is obtained; if at each moment there are multiple frequencies less than the preset frequency in the frequency components of the superconducting magnet, the ratio of the energy corresponding to each frequency less than the preset frequency to the total energy of all frequencies is obtained.

[0057] By setting the value range of the preset frequency as described above, inaccurate measurement results due to too small a value are avoided, and misjudgment due to too large a value is avoided.

[0058] According to an embodiment of the present invention, in S60, the preset percentage ranges from 50% to 90%.

[0059] By setting the value range of the preset percentage as described above, inaccurate measurement results due to excessively large values are avoided, and misjudgment due to excessively small values is also avoided.

[0060] According to an embodiment of the present invention, in S60, the preset threshold value ranges from 10 to 20.

[0061] By setting the value range of the preset threshold as described above, inaccurate measurement results due to overly large values are avoided, and misjudgment due to overly small values is avoided.

[0062] According to one embodiment of the present invention, in S70, when at least one of the ratios of the energy of the frequency components of the superconducting magnet corresponding to each moment having a frequency lower than a preset frequency to the total energy of all frequencies in the frequency components of the superconducting magnet corresponding to the corresponding moment is greater than a preset percentage, and when the ratio of the maximum value to the root mean square of the low-pass filtered signal of the superconducting magnet is greater than or equal to a preset threshold, the quench moment of the superconducting magnet is obtained by the following formula:

[0063] T Qch =(T k +T j ) / 2;

[0064] Where, T Qch is the quenching moment of the superconducting magnet, T k is the judgment time, T j is the time corresponding to the maximum value of the low-pass filtered signal of the superconducting magnet.

[0065] The method of the present invention is described in detail below by taking a certain high dynamic single-coil low-temperature superconducting magnet as an example.

[0066] In this embodiment, a high-dynamic, single-coil, low-temperature superconducting magnet includes an inner chamber, an outer chamber, and a superconducting coil. The inner chamber is located within the outer chamber, which contains liquid helium. The superconducting coil is completely immersed in liquid helium to ensure a constant low-temperature environment and state. When the superconducting coil is energized and excited to become a superconducting magnet, the magnetic field generated by the coil interacts with the current carried by the wire itself. This force causes the coil as a whole to be pulled outward, resulting in stretching and significant strain. The strain generated by the excitation of the superconducting coil changes significantly with changes in the excitation current. By measuring the strain of the superconducting coil, the excitation state of the coil can be indirectly measured, thereby determining whether the superconducting magnet has quenched.

[0067] like Figure 2 As shown, when a superconducting magnet quenches, the superconducting coil generates resistance, causing the current to drop, and the magnetic field to drop along with the current. This significantly reduces the interaction between the magnetic field and the current, ultimately leading to a decrease in the strain of the superconducting coil body. By installing a strain sensor on the surface of the superconducting coil to detect the strain on the surface of the superconducting coil and generate a strain signal, the strain signal is then processed using the method of the present invention to determine the moment of superconducting magnet quench.

[0068] Compared with the prior art, the present invention has the following beneficial effects:

[0069] (1) This method is not limited by the number of coils in the superconducting magnet and can be used for both single-coil and multi-coil superconducting magnets.

[0070] (2) This method is not limited by the slow temperature conduction after the superconducting magnet quenches, and can be quickly detected after a local quench.

[0071] (3) This method is not limited by the influence of the external space of the superconducting magnet, and the detection sensor can be built into the superconducting magnet.

[0072] The present invention also provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any of the above methods when executing the computer program.

[0073] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0074] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0075] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0076] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for detecting quench in a low-temperature superconducting magnet based on strain signals, characterized in that: The method comprises: S10, at the current time T i As the detection moment, obtain the strain signal data of the superconducting magnet in a preset time period before the detection moment, and simultaneously go to S20 and S40; S20, obtaining a frequency component of the superconducting magnet corresponding to each moment in the preset time period before the detection moment based on the strain signal data of the superconducting magnet in the preset time period before the detection moment; S30, respectively calculating the energy of the frequency components of the superconducting magnet corresponding to each moment that has a frequency less than a preset frequency, obtaining a ratio of the energy of the frequency components of the superconducting magnet corresponding to each moment that has a frequency less than the preset frequency to the total energy of all frequencies in the frequency components of the superconducting magnet corresponding to the corresponding moment, and proceeding to S60; S40, performing low-pass filtering on the strain signal data of the superconducting magnet within a preset time period before the detection moment to obtain a low-pass filtered signal of the superconducting magnet; S50, obtaining a maximum value and a root mean square value of a low-pass filtered signal of a superconducting magnet; S60, determining whether all ratios of the energy of the frequency components of the superconducting magnet corresponding to each moment that has a frequency lower than the preset frequency to the total energy of all frequencies in the frequency components of the superconducting magnet corresponding to the corresponding moment are less than or equal to a preset percentage, and at the same time determining whether the ratio of the maximum value to the root mean square of the low-pass filtered signal of the superconducting magnet is less than a preset threshold. If both are yes, then at the next moment T i+1 As the detection moment, obtain the strain signal data of the superconducting magnet in a preset time period before the detection moment, and simultaneously go to S20 and S40, otherwise go to S70; S70. If at least one of the ratios of the energy of the frequency components of the superconducting magnet corresponding to each moment that has a frequency lower than a preset frequency to the total energy of all frequencies in the frequency components of the superconducting magnet corresponding to the corresponding moment is greater than a preset percentage, and the ratio of the maximum value of the low-pass filtered signal of the superconducting magnet to the root mean square is less than a preset threshold, determine that the superconducting magnet is quenched, and use the determination moment as the quench moment of the superconducting magnet. If there is only one ratio greater than the preset percentage, the moment T corresponding to the ratio greater than the preset percentage is used as the quench moment of the superconducting magnet. k As the determination time, if there are multiple ratios greater than the preset percentage, the earliest time T among the multiple times corresponding to the multiple ratios greater than the preset percentage is used. k As a moment of judgment; If all ratios of the energy of the frequency component of the superconducting magnet corresponding to each moment that is less than the preset frequency to the total energy of all frequencies in the frequency component of the superconducting magnet corresponding to the corresponding moment are less than or equal to the preset percentage, and the ratio of the maximum value of the low-pass filtered signal of the superconducting magnet to the root mean square is greater than or equal to the preset threshold, it is determined that the superconducting magnet is quenched, and the time T corresponding to the maximum value of the low-pass filtered signal of the superconducting magnet is set as j As the quench moment of a superconducting magnet; If at least one of the ratios of the energy of the frequency components of the superconducting magnet corresponding to each moment that has a frequency lower than the preset frequency to the total energy of all frequencies in the frequency components of the superconducting magnet corresponding to the corresponding moment is greater than a preset percentage, and the ratio of the maximum value to the root mean square of the low-pass filtered signal of the superconducting magnet is greater than or equal to a preset threshold, it is determined that the superconducting magnet is quenched, and based on the determination time T k The time T corresponding to the maximum value of the low-pass filter signal of the superconducting magnet j Obtain the quench moment of the superconducting magnet.

2. The method according to claim 1, characterized in that In S10, the current time T i As the detection moment, obtaining the strain signal data of the superconducting magnet in the preset time period before the detection moment includes: taking the current moment T i As the detection time, get the i -△T time to T i The strain signal data of the superconducting magnet in the time period, where the value range of △T is 10~50ms.

3. The method according to claim 1 or 2, characterized in that In S20, obtaining the frequency components of the superconducting magnet corresponding to each moment in the preset time period before the detection moment based on the strain signal data of the superconducting magnet in the preset time period before the detection moment includes: performing a discrete wavelet transform on the strain signal data of the superconducting magnet in the preset time period before the detection moment to obtain the frequency components of the superconducting magnet corresponding to each moment in the preset time period before the detection moment.

4. The method according to any one of claims 1 to 3, characterized in that In S30 , the preset frequency range is 10 to 50 Hz.

5. The method according to claim 1, wherein In S60 , the preset percentage ranges from 50% to 90%.

6. The method according to claim 1, characterized in that In S60 , the preset threshold value ranges from 10 to 20.

7. The method according to claim 1, characterized in that In S70, when at least one of the ratios of the energy of frequencies less than a preset frequency in the frequency components of the superconducting magnet corresponding to each moment to the total energy of all frequencies in the frequency components of the superconducting magnet corresponding to the corresponding moment is greater than a preset percentage, and when the ratio of the maximum value to the root mean square of the low-pass filtered signal of the superconducting magnet is greater than or equal to a preset threshold, the quench moment of the superconducting magnet is obtained by the following formula: T Qch =(T k +T j ) / 2; Where, T Qch is the quenching moment of the superconducting magnet, T k is the judgment time, T j is the time corresponding to the maximum value of the low-pass filtered signal of the superconducting magnet.

8. A computer device, characterized in that: The method comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the method according to any one of claims 1 to 7 is implemented when the processor executes the computer program.

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