Superconducting liquid level sensor based on dynamic thermal management, liquid level detection system and method

Abstract

The invention discloses a superconductive liquid level sensor based on dynamic thermal management and a liquid level detection system and method, and relates to the technical field of superconductive liquid level detection.The superconductive liquid level sensor mainly comprises a superconductive liquid level sensor wire, a balance weight floater column and a heater, one part of the superconductive liquid level sensor wire is located in low-temperature liquid below a liquid-gas intersection interface, and the other part of the superconductive liquid level sensor wire is connected with the balance weight floater column; one part of the balance weight floater column is located in the low-temperature gas, the other part of the balance weight floater column is located in the low-temperature gas above the liquid-gas intersection interface, the balance weight floater column can float on the liquid-gas intersection interface, and the heater is fixedly arranged on the side portion of the balance weight floater column and is close to the liquid-gas intersection interface. The superconducting liquid level detection system based on dynamic thermal management comprises the superconducting liquid level sensor based on dynamic thermal management. The superconducting liquid level detection method based on dynamic thermal management is implemented by using the superconducting liquid level sensor based on dynamic thermal management. According to the invention, high measurement precision can be ensured.

Description

Technical Field

[0001] This invention relates to the field of superconducting liquid level detection technology, and in particular to a superconducting liquid level sensor, liquid level detection system and method based on dynamic thermal management. Background Technology

[0002] Cryogenic liquid level measurement is one of the important applications of superconducting technology. By utilizing the superconductivity of superconducting materials, where the resistance suddenly drops to zero at a specific temperature, it is possible to measure the liquid level of cryogenic liquids below the superconducting transition temperature. Generally, the greater the temperature difference between the gas and the liquid, the more accurate the measurement results will be. However, the temperature difference between the liquid and the gas is usually very small, which makes it difficult to guarantee the measurement accuracy.

[0003] To address this issue, current technologies typically employ heaters to heat the gas above the cryogenic liquid. These heaters are usually statically mounted on the sidewall of the cryogenic tank. However, when the liquid level is extremely low, the heater is far from the liquid interface, requiring heat to be conducted over a long distance through the gas phase to the liquid surface. The low thermal conductivity of the gas phase results in a gentle temperature gradient near the liquid surface, with insignificant temperature differences and blurred superconducting boundaries, leading to low measurement accuracy. Conversely, when the liquid level is extremely high, the heater approaches the liquid interface excessively, even risking contact with the liquid surface. Excessive heat flow directly into the cryogenic liquid can cause violent evaporation, potentially disrupting the stability of the phase interface and affecting the accuracy of the measurement results. Therefore, there is an urgent need for a superconducting liquid level sensor, liquid level detection system, and method based on dynamic thermal management to solve these technical problems. Summary of the Invention

[0004] The purpose of this invention is to provide a superconducting liquid level sensor, liquid level detection system and method based on dynamic thermal management, so as to solve the problems existing in the prior art and ensure high measurement accuracy.

[0005] To achieve the above objectives, the present invention provides the following solution: This invention provides a superconducting liquid level sensor based on dynamic thermal management, comprising a superconducting liquid level sensor wire, a counterweight float column, and a heater. A portion of the superconducting liquid level sensor wire is located in the cryogenic liquid below the liquid-gas interface, and another portion is located in the cryogenic gas above the liquid-gas interface. The counterweight float column can float on the liquid-gas interface, and the heater is fixedly disposed on the side of the counterweight float column and close to the liquid-gas interface.

[0006] In some embodiments, a temperature sensor is also included, which is fixedly disposed on the side of the counterweight float column and disposed adjacent to the heater in the horizontal plane.

[0007] In some embodiments, a measuring sealed container is also included, which is disposed inside a cryogenic Dewar container. The counterweight float column, the superconducting liquid level sensor wire, and the heater are all located inside the measuring sealed container, and the cryogenic liquid inside the measuring sealed container is connected to the cryogenic liquid inside the cryogenic Dewar container.

[0008] In some embodiments, the counterweight float column is a column with an axially open center and an annular sealed cavity filled with gas, so that the counterweight float column floats on the liquid-gas interface, and the superconducting liquid level sensor wire can pass through the central opening of the counterweight float column.

[0009] In some embodiments, the heater is a MEMS micro heater.

[0010] In some embodiments, the counterweight float column is made of a non-magnetic material.

[0011] The present invention also provides a superconducting liquid level detection system based on dynamic thermal management, including the superconducting liquid level sensor based on dynamic thermal management as described above.

[0012] In some embodiments, a superconducting block and a permanent magnet rod are also included. The permanent magnet rod is inserted into the cryogenic liquid in a direction parallel to the axis of the counterweight float column and is located between the counterweight float column and the cryogenic Dewar container. The superconducting block is fixedly disposed inside the counterweight float column and is disposed close to the permanent magnet rod.

[0013] In some embodiments, the permanent magnet rod is a neodymium iron boron magnet or a samarium cobalt magnet.

[0014] This invention also provides a superconducting liquid level detection method based on dynamic thermal management, implemented using the superconducting liquid level sensor based on dynamic thermal management as described above, and comprising the following steps: S1: The counterweight float column rises and falls with the liquid level of the cryogenic liquid, and the counterweight float column drives the heater to dynamically adapt to the position of the liquid-gas interface, and the heater is close to the liquid-gas interface. S2: Heating is released via the heater; S3: Detect the level of the cryogenic liquid using the superconducting liquid level sensor wire.

[0015] The present invention achieves the following technical effects compared to the prior art: The superconducting liquid level sensor based on dynamic thermal management provided by this invention adopts a counterweight float column structure. The counterweight float column floats on the liquid-gas interface and adaptively adjusts its position according to the fluctuation of the liquid level, driving the heater to move. The heating position of the heater changes dynamically, so that the distance between the heater and the surface of the cryogenic liquid remains constant. This ensures precise heating of the cryogenic gas above the cryogenic liquid. The relative position between the heating position and the surface of the cryogenic liquid remains constant. Even if the cryogenic liquid level is too low, the heating position will not be too far from the liquid surface, and even if the cryogenic liquid level is too high, the heating position will not be too close to the liquid surface. The heater always maintains an optimal position with a constant distance from the liquid surface. The precise heating of the heater ensures that the temperature gradient of the superconducting liquid level sensor wire at the liquid-gas interface is stable, making the transition point between the superconducting state and the normal state (i.e., the resistance jump point) relatively stable, improving the measurement sensitivity and signal-to-noise ratio, and ensuring high measurement accuracy. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a partial structural schematic diagram of a superconducting liquid level detection system based on dynamic thermal management in some embodiments of the present invention; Figure 2 This is a schematic diagram showing the connection between the counterweight float column, the superconducting block, the micro heater, and the temperature sensor in some embodiments of the present invention; Figure 3 This is a schematic diagram of the structure of a superconducting liquid level detection system based on dynamic thermal management in some embodiments of the present invention; Figure 4 This is a schematic diagram of a superconducting liquid level detection system based on dynamic thermal management in some embodiments of the present invention.

[0018] In the diagram: 101-Superconducting liquid level sensor based on dynamic thermal management; 1-Counterweight float column; 2-Heater; 3-Temperature sensor; 4-Superconducting block; 5-Superconducting liquid level sensor wire; 6-Measuring sealed container; 7-Measuring voltage lead; 8-Miniature heater power lead; 9-Temperature sensor lead; 10-Permanent magnet; 11-Cryogenic liquid; 12-Liquid-gas interface; 13-Cryogenic gas; 14-Cryogenic Dewar container; 15-Isolation top cover; 16-Measuring voltage source and first liquid level display module; 17-Heating power supply; 18-Temperature sensing and second liquid level display module. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] The purpose of this invention is to provide a superconducting liquid level sensor, liquid level detection system and method based on dynamic thermal management, so as to solve the problems existing in the prior art and ensure high measurement accuracy.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1 like Figures 1-4 As shown, the present invention provides a superconducting liquid level sensor 101 based on dynamic thermal management, including a superconducting liquid level sensor wire 5, a counterweight float column 1, and a heater 2. A portion of the superconducting liquid level sensor wire 5 is located in the cryogenic liquid 11 below the liquid-gas interface 12, and another portion is located in the cryogenic gas 13 above the liquid-gas interface 12. The counterweight float column 1 can float on the liquid-gas interface 12. The heater 2 is fixedly disposed on the side of the counterweight float column 1 and close to the liquid-gas interface 12. A counterweight float column 1 is adopted, which floats on the liquid-gas interface 12. The counterweight float column 1 adaptively adjusts its position according to the fluctuation of the liquid level, and drives the heater 2 to move. The heating position of the heater 2 changes dynamically, so that the distance between the heater 2 and the surface of the cryogenic liquid 11 remains constant. This ensures precise heating of the cryogenic gas 13 above the cryogenic liquid 11. The relative position between the heating position and the surface of the cryogenic liquid 11 remains constant. Even if the surface of the cryogenic liquid 11 is too low, the heating position will not be too far from the surface. Even if the surface of the cryogenic liquid 11 is too high, the heating position will not be too close to the surface. The heater 2 always maintains the optimal position with a constant distance from the surface. The precise heating of the heater 2 ensures the stability of the temperature gradient of the superconducting liquid level sensor wire 5 at the liquid-gas interface, so that the transition point between the superconducting state and the normal state (i.e., the resistance jump point) is relatively stable, which improves the measurement sensitivity and signal-to-noise ratio and ensures high measurement accuracy.

[0023] In some embodiments, the superconducting liquid level sensor 101 based on dynamic thermal management further includes a temperature sensor 3, which is fixedly disposed on the side of the counterweight float column 1 and adjacent to the heater 2 in the horizontal plane. The temperature sensor 3, being in close contact with the heater 2, can directly read the actual temperature field data generated by the heater 2 at the gas-liquid interface. The core of superconducting liquid level measurement lies in accurately finding the boundary between the superconducting state and the normal state. The adjacent placement of the temperature sensor 3 and the heater 2 is equivalent to establishing a miniature, precise temperature reference point on the counterweight float column 1. Under certain complex operating conditions, the data from the temperature sensor 3 can serve as an auxiliary criterion, helping the system to more clearly define the physical location of the liquid-gas interface and reduce measurement errors caused by temperature gradient ambiguity. Utilizing superconducting material detection in conjunction with the temperature sensor 3 improves the accuracy and stability of superconducting liquid level measurement, fundamentally solving problems such as uneven heating at the liquid-gas interface, blurred superconducting boundary, and large liquid level measurement errors due to response delay.

[0024] In a preferred embodiment, temperature sensor 3 employs a low-temperature capacitive temperature sensor. This sensor uses a 0805 package, has a capacitance value in the tens of nF range, and exhibits high sensitivity and temperature resolution. It is suitable for operation in environments with strong antimagnetism and low temperatures, receiving small AC signals in the milliampere range and providing highly sensitive temperature detection. In low-temperature environments, even a tiny amount of heat can disrupt the temperature field. Because this low-temperature capacitive sensor uses a 0805 package, it generates almost no self-heating. This means it measures the actual temperature established by the heater 2 near the counterweight float column 1, rather than the temperature after the sensor itself heats up. This is crucial for maintaining the accuracy of closed-loop thermal control.

[0025] In some embodiments, the superconducting level sensor 101 based on dynamic thermal management further includes a measurement sealed container 6, which is disposed within the cryogenic Dewar container 14. The counterweight float column 1, the superconducting level sensor wire 5, and the heater 2 are all located within the measurement sealed container 6, and the cryogenic liquid 11 within the measurement sealed container 6 is connected to the cryogenic liquid 11 within the cryogenic Dewar container 14, providing an independent space that reduces the impact of liquid level fluctuations. The measurement sealed container 6 is connected to the main container (cryo-dewar container 14) through the principle of communicating vessels, but its internal space is relatively independent and narrow, with a small liquid surface area and high damping, resulting in smaller liquid level fluctuations within the measurement sealed container 6 compared to the main container (cryo-dewar container 14). This provides a relatively static and stable gas-liquid interface for the superconducting level sensor. The counterweight float column 1 no longer drifts with the main liquid surface but can stably indicate the average liquid level, greatly improving the reliability of the measurement data. Furthermore, because the internal space of the sealed container 6 is relatively small, the heat generated by the heater 2 is more likely to form a stable temperature gradient within this space and is less likely to be dissipated by external heat convection. This allows for the use of less heating power to achieve the same temperature measurement effect, further reducing the system's heat load.

[0026] In some embodiments, the counterweight float column 1 is an axially open column with an annular sealed cavity filled with gas, allowing the counterweight float column 1 to float on the liquid-gas interface 12. The superconducting liquid level sensor wire 5 can pass through the central opening of the counterweight float column 1, and the counterweight float column 1 can float along the longitudinal height of the superconducting liquid level sensor wire 5. The central opening provides a natural vertical channel for the superconducting liquid level sensor wire 5, allowing it to pass through the center of the counterweight float column 1 without needing to bypass it or use complex flexible connections. The coaxial structure of the counterweight float column 1 surrounding the wire reduces the overall radial dimension of the sensor, making the entire measuring device more compact and suitable for installation in space-constrained cryogenic Dewar container 14. Compared to a solid cylinder or a simple hollow sphere, the annular structure has a larger moment of inertia. When the cryogenic liquid 11 shakes, the annular counterweight float column 1 is unlikely to tip over or tilt, ensuring that the heater 2 and temperature sensor 3 fixed to the side of the counterweight float column 1 always maintain a vertical posture. The heating position will not deviate from the preset optimal height due to the tilt of the counterweight float column 1, thus maintaining the accuracy of the measurement.

[0027] It should be noted that the annular sealed cavity is filled with a low-density cryogenic gas 13. In cryogenic environments, the density of ordinary gases increases significantly (gas contraction). Using a low-density gas (such as helium or hydrogen) ensures that its density at cryogenic temperatures is much lower than that of the cryogenic liquid 11 (such as liquid nitrogen or liquid helium), and even much lower than the saturated vapor density above the cryogenic liquid 11, thus maximizing the net buoyancy generated by the counterweight float column 1. Greater buoyancy means that the counterweight float column 1 can more easily support the weight of the heater 2, temperature sensor 3, and connecting cables, ensuring that the counterweight float column 1 always floats on the liquid surface and does not sink or partially sink due to excessive load.

[0028] In some embodiments, heater 2 is a MEMS micro heater. Fabricated on a sapphire or ceramic substrate, the MEMS micro heater is extremely small (millimeters or even micrometers in size), allowing it to be precisely mounted on the counterweight float column 1, within millimeters or even less of the liquid-gas interface. Near-field heating capability is crucial for superconducting level sensors because it ensures heat is concentrated on the critical area where the wire contacts the liquid surface, without causing widespread thermal contamination of the surrounding environment. Furthermore, the MEMS micro heater has a very low heat capacity of its heating element, allowing it to reach the set temperature within milliseconds when the control system needs to adjust the temperature. It also responds quickly to rapid changes in liquid level, avoiding the temperature overshoot or hysteresis issues caused by the high thermal inertia of traditional heaters, and is able to adapt to and capture transient changes in liquid level.

[0029] As a preferred embodiment, the MEMS micro heater is a nickel-chromium thick-film heater in a 0603 package with an extremely low temperature coefficient of resistance, and operates stably in a low-temperature medium. The extremely low temperature coefficient of resistance ensures that the resistance value remains essentially constant regardless of changes in the temperature of the heater 2 itself. This ensures that the power set by the control system is the actual output power, eliminates nonlinear thermal feedback interference, and makes the control algorithm of the thermal management system simpler, more stable, and more accurate.

[0030] In some embodiments, the counterweight float column 1 is made of a non-magnetic material. In a strong magnetic field environment, magnetic materials are subject to a large Lorentz force or magnetic attraction. If the counterweight float column 1 is magnetic, it may be attracted to the Dewar container wall (if magnetic) or a superconducting magnet, causing the counterweight float column 1 to become stuck, unable to move with the liquid level, or even sink directly to the bottom. The non-magnetic material ensures that the counterweight float column 1 is only affected by gravity and buoyancy, maintaining a vertical posture in a strong magnetic field without deflection or tilting. Furthermore, the core of the superconducting liquid level sensor is the superconducting wire, whose working principle relies on the switching of current between the superconducting state and the normal state. If the counterweight float column 1 is magnetic, it will change the local magnetic field distribution, causing distortion of the magnetic flux passing through the superconducting coil, thereby interfering with the sensor's critical current determination and producing measurement errors. The non-magnetic material ensures the purity of the magnetic field environment around the superconducting wire, ensuring that its critical current and critical temperature are not affected by external ferromagnetic materials.

[0031] In a preferred embodiment, the superconducting liquid level sensor 101 based on dynamic thermal management further includes a measuring voltage lead 7, a micro-heater power supply lead 8, and a temperature sensor lead 9. The superconducting liquid level sensor lead 5 is connected to the measuring voltage source and the first liquid level display module 16 via the measuring voltage lead 7. The MEMS micro-heater is connected to the heating power supply 17 via the micro-heater power supply lead 8. The temperature sensor 3 is connected to the temperature sensing and second liquid level display module 18 via the temperature sensor lead 9. The measuring voltage lead 7, the micro-heater power supply lead 8, and the temperature sensor lead 9 are all made of low-temperature resistant shielded cables. Separating the measurement, heating, and temperature measurement circuits avoids crosstalk between the heater power supply and weak currents (measuring voltage and sensor signal).

[0032] Furthermore, the low-temperature Dewar container 14 of the present invention is provided with an isolation top cover 15, and one end of the voltage measurement lead 7, the micro heater power supply lead 8, and the temperature sensor lead 9 all pass through the isolation top cover 15.

[0033] Example 2 This embodiment provides a superconducting liquid level detection system based on dynamic thermal management, including the superconducting liquid level sensor 101 based on dynamic thermal management as described in Embodiment 1. It enables system-level optimization and simplification of the superconducting liquid level detection system: replacing the complex hardware structure with a more intelligent, flexible, and accurate liquid level measurement scheme, and replacing multiple discrete heaters in a static heating layout with a dynamic adaptive heat source. This improves detection performance while reducing system complexity and enhancing reliability, thus solving the difficult balance between complexity and high-precision measurement in existing solutions. In some embodiments, the superconducting liquid level detection system based on dynamic thermal management further includes a superconducting block 4 and a permanent magnet rod 10. The superconducting block 4 is preferably a regular hexahedral superconducting block. The magnetic flux of the permanent magnet rod 10 can pass through the superconducting block 4. The permanent magnet rod 10 is inserted into the cryogenic liquid 11 along a direction parallel to the axis of the counterweight float column 1 and is located between the counterweight float column 1 and the cryogenic Dewar container 14. The superconducting block 4 is fixedly disposed within the counterweight float column 1 and close to the permanent magnet rod 10. Utilizing the attractive force or magnetic flux pinning effect between the superconducting block 4 and the permanent magnet rod 10, the counterweight float column 1 is suspended near the permanent magnet rod 10. The magnetic force between the superconducting block 4 and the permanent magnet rod 10 has stiffness characteristics. If the counterweight float column 1 experiences a slight shift or tilt due to liquid sloshing, the magnetic force will generate a reverse restoring torque, pulling the counterweight float column 1 back to its central position. This ensures that the counterweight float column 1 always maintains a vertical orientation, preventing the heater 2 and temperature sensor 3 from deviating from their optimal measurement positions due to the tilt of the counterweight float column 1, further improving the spatial stability of the measurement. Because it is magnetically levitated, there is no physical contact between the superconducting block 4 and the permanent magnet rod 10. In cryogenic engineering, any solid connection (such as a metal rail) that penetrates the high and low temperature zones is a huge heat leakage channel. Removing mechanical connections cuts off the thermal bridge conducted from room temperature or the container wall to the counterweight float column 1 and the internal cryogenic liquid 11, significantly reducing the parasitic heat load of the system.

[0034] In some embodiments, the permanent magnet rod 10 employs neodymium iron boron (NdFeB) magnets or samarium cobalt (SCo) magnets. NdFeB or SCo magnets typically exhibit significantly increased coercivity and remanence in liquid nitrogen or liquid helium media, providing a stronger magnetic field in cryogenic environments than at room temperature, resulting in better stability of the counterweight float column 1. Comparatively, SCo magnets exhibit extremely strong oxidation resistance in vacuum and cryogenic environments, are more corrosion-resistant than NdFeB, and have a longer lifespan. At the same magnetic field strength, NdFeB is generally less expensive than SCo, making it suitable for large-scale engineering applications. Sintered NdFeB, in particular, provides a very strong permanent magnetic field, making it the preferred material for scenarios requiring extremely strong guiding force to resist violent liquid sloshing (such as vehicle-mounted Dewars). The specific material used for the permanent magnet rod 10 can be flexibly selected according to requirements.

[0035] Example 3 This embodiment provides a superconducting liquid level detection method based on dynamic thermal management, implemented using the superconducting liquid level sensor 101 based on dynamic thermal management from Embodiment 1, and includes the following steps: S1: The counterweight float column 1 rises and falls with the rise and fall of the liquid level of the cryogenic liquid 11. The counterweight float column 1 drives the heater to dynamically adapt to the position of the liquid-gas interface 12, and the heater is close to the liquid-gas interface 12. S2: Heating is released via a heater; S3: The liquid level of cryogenic liquid 11 is detected using the superconducting liquid level sensor wire 5.

[0036] This method utilizes the raising and lowering of the counterweight float column 1 to synchronously drive the heater 2 to remain close to the liquid-gas interface 12, ensuring a consistent thermal gradient environment sensed by the superconducting level sensor wire 5 throughout the entire liquid level change process. This spatial consistency eliminates nonlinear errors caused by heating position deviations, ensuring uniform measurement accuracy at both high and low liquid levels. Because the heater is always in the optimal position, the superconducting wire's transition from the superconducting state to the normal state at the liquid surface is more significant and clear, directly translating into a steep voltage signal jump. This allows the system to more easily identify minute changes in liquid level, significantly improving measurement sensitivity and response speed.

[0037] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A superconducting liquid level sensor based on dynamic thermal management, characterized in that: The device includes a superconducting liquid level sensor wire, a counterweight float column, and a heater. A portion of the superconducting liquid level sensor wire is located in the cryogenic liquid below the liquid-gas interface, and another portion is located in the cryogenic gas above the liquid-gas interface. The counterweight float column can float on the liquid-gas interface. The heater is fixedly installed on the side of the counterweight float column and close to the liquid-gas interface.

2. The superconducting liquid level sensor based on dynamic thermal management according to claim 1, characterized in that: It also includes a temperature sensor, which is fixedly mounted on the side of the counterweight float column and is arranged adjacent to the heater in the horizontal plane.

3. The superconducting liquid level sensor based on dynamic thermal management according to claim 1, characterized in that: It also includes a measuring sealed container, which is disposed inside a cryogenic Dewar container. The counterweight float column, the superconducting liquid level sensor wire, and the heater are all located inside the measuring sealed container, and the cryogenic liquid inside the measuring sealed container is connected to the cryogenic liquid inside the cryogenic Dewar container.

4. The superconducting liquid level sensor based on dynamic thermal management according to claim 1, characterized in that: The counterweight float column is a column with an axially open center. The column has an annular sealed cavity filled with gas, so that the counterweight float column floats on the liquid-gas interface. The superconducting liquid level sensor wire can pass through the central opening of the counterweight float column.

5. The superconducting liquid level sensor based on dynamic thermal management according to claim 1, characterized in that: The heater is a MEMS micro heater.

6. The superconducting liquid level sensor based on dynamic thermal management according to claim 1, characterized in that: The counterweight float column is made of non-magnetic material.

7. A superconducting liquid level detection system based on dynamic thermal management, characterized in that: Including the superconducting liquid level sensor based on dynamic thermal management as described in any one of claims 1-6.

8. The superconducting liquid level detection system based on dynamic thermal management according to claim 7, characterized in that: It also includes a superconducting block and a permanent magnet rod. The permanent magnet rod is inserted into the cryogenic liquid in a direction parallel to the axis of the counterweight float column and is located between the counterweight float column and the cryogenic Dewar container. The superconducting block is fixedly disposed inside the counterweight float column and is disposed close to the permanent magnet rod.

9. The superconducting liquid level detection system based on dynamic thermal management according to claim 8, characterized in that: The permanent magnet rod is made of neodymium iron boron magnet or samarium cobalt magnet.

10. A superconducting liquid level detection method based on dynamic thermal management, characterized in that, The implementation using the superconducting liquid level sensor based on dynamic thermal management as described in any one of claims 1-6 includes the following steps: S1: The counterweight float column rises and falls with the liquid level of the cryogenic liquid, and the counterweight float column drives the heater to dynamically adapt to the position of the liquid-gas interface, and the heater is close to the liquid-gas interface. S2: Heating is released via the heater; S3: Detect the level of the cryogenic liquid using the superconducting liquid level sensor wire.

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