A cryogenic measurement system

Abstract

The application discloses a low-temperature measuring system, which comprises a first main body, a first container arranged in the first main body, a second main body arranged in the first main body, a plug rod assembly arranged in the second main body in a plug-in manner and loaded with a sample table, the second main body is arranged directly above the first container, and the plug rod assembly is used for connecting the first container; a third main body for accommodating a cold head is arranged in the first main body, and the low-temperature measuring system further comprises a first helium pipeline, a second helium pipeline and a third helium pipeline; the first helium pipeline is communicated with the third cavity; the second helium pipeline enters the third main body along an air inlet direction, winds around the outside of the cold head, extends out of the third main body and is communicated with the first container; the third helium pipeline enters the third main body along the air inlet direction, winds around the outside of the cold head, extends out of the third main body, passes through an expansion pipe and is communicated with the first container. The low-temperature measuring system has low refrigeration cost, good refrigeration effect and can meet the low-temperature measuring conditions of samples.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of low-temperature property measurement, in particular to a low-temperature measurement system. BACKGROUND

[0002] The variable-temperature high-magnetic-field comprehensive property measurement platform is an indispensable key instrument for measuring the electrical, magnetic, thermal and other properties of micro-nano devices and new materials.

[0003] In order to ensure the refrigeration efficiency, the existing measurement platform generally directly cools the sample table through a liquid helium pipeline. This structure has a relatively high refrigeration cost, and it is difficult to store liquid helium. There is also a helium pipeline for cooling the sample table. This structure has a relatively low refrigeration cost, but the refrigeration effect is relatively poor. SUMMARY

[0004] The purpose of the present application is to provide a low-temperature measurement system with low refrigeration cost and good refrigeration effect, which can meet the low-temperature measurement conditions of the sample.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is:

[0006] A low-temperature measurement system, comprising a first body having a first cavity, a first container arranged in the first body, a second body having a second cavity and arranged in the first body, and a plug rod assembly arranged in the second body and loaded with a sample table, the second body is arranged above the first container, and the plug rod assembly is used to connect the first container.

[0007] The low-temperature measurement system further comprises a refrigeration assembly, and the refrigeration assembly comprises a cold head arranged in the first body.

[0008] The first body is provided with a third body having a third cavity for accommodating the cold head, and the low-temperature measurement system further comprises a first helium pipeline, a second helium pipeline and a third helium pipeline.

[0009] The first helium pipeline is in communication with the third cavity.

[0010] The second helium pipeline enters the third body along the gas inlet direction and is arranged outside the cold head, then extends out of the third body and is in communication with the first container.

[0011] The third helium pipeline enters the third body along the gas inlet direction and is arranged outside the cold head, then extends out of the third body and is in communication with the first container through an expansion tube.

[0012] Preferably, the second helium pipeline and the third helium pipeline are respectively spirally arranged on the inner surface of the third body.

[0013] Preferably, the third helium pipeline extends out of the third main body, then passes through the second main body outside, and then communicates with the first container through the expansion tube.

[0014] Preferably, the third cavity includes a gas storage cavity and a liquid storage cavity which are sequentially communicated from top to bottom.

[0015] The first main body is provided with a fourth main body for accommodating the first container and penetrated by the second main body, and the fourth main body is in abutment with the liquid storage cavity outside the fourth main body.

[0016] The first main body is also provided with a fifth main body for accommodating the fourth main body and penetrated by the second main body, and the fifth main body is in abutment with the gas storage cavity outside the fifth main body.

[0017] Preferably, the low-temperature measurement system further comprises a sixth main body arranged around the outside of the second main body, and a sixth cavity is formed between the inside of the sixth main body and the outside of the second main body and communicates with the first container.

[0018] The low-temperature measurement system further comprises a first air pump located outside the first main body and communicating with the sixth cavity through a first air pipe, and the sixth main body penetrates the first main body upward, and the first air pipe is located outside the first main body.

[0019] More preferably, the low-temperature measurement system further comprises a second air pipe communicating between the sixth cavity and the first air pump, and one end of the second air pipe is located at the bottom of the sixth cavity.

[0020] Preferably, the low-temperature measurement system further comprises a second air pump located outside the first main body and communicating with the second cavity through a third air pipe.

[0021] Preferably, the low-temperature measurement system further comprises a superconducting magnet assembly arranged in the first main body and around the outside of the sample table.

[0022] Preferably, the insertion rod assembly comprises a hollow rod body, a rod head communicated with the lower end of the rod body, and a locking mechanism arranged at the lower end of the rod head and used for locking with the upper end of the first container, and the sample table is arranged in the rod head.

[0023] Preferably, the insertion rod assembly further comprises a control unit, a temperature sensor and a heating resistor arranged on the sample table, and the temperature sensor and the heating resistor are respectively electrically connected with the control unit, and the control unit is used for controlling the heating power of the heating resistor according to the temperature signal fed back by the temperature sensor.

[0024] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: In the cryogenic measurement system of the present invention, the first helium gas pipeline is connected to the third chamber, allowing the helium gas in the third chamber to continuously cool and liquefy under the prolonged action of the cold head, forming a liquid helium interlayer between the cold head and the third main body, thus improving the cooling effect on the helium gas in the second and third helium gas pipelines. The second helium gas pipeline is directly connected to the first container, enabling rapid cooling of the sample stage. The third helium gas pipeline is further cooled through an expansion tube before entering the first container, further enhancing the cooling effect on the sample stage. This cryogenic measurement system uses helium as a cold source, resulting in rapid cooling, a large cooling range, good cooling effect, and relatively low cost, thus meeting the cryogenic measurement conditions for samples. Attached Figure Description

[0025] Appendix Figure 1 This is a schematic diagram of the structure of a cryogenic measurement system according to a specific embodiment of the present invention;

[0026] Appendix Figure 2 This is a schematic cross-sectional view of a cryogenic measurement system according to a specific embodiment of the present invention. Figure 1 ;

[0027] Appendix Figure 3 This is a schematic cross-sectional view of a cryogenic measurement system according to a specific embodiment of the present invention. Figure 2 ;

[0028] Appendix Figure 4 This is a schematic diagram of the insert assembly.

[0029] Appendix Figure 5 This is a schematic diagram of a low-temperature measurement system according to a specific embodiment of the present invention.

[0030] The components are as follows: 1. First main body; 2. First container; 3. Second main body; 4. Insertion rod assembly; 41. Rod body; 42. Rod head; 43. Sample stage; 44. Locking mechanism; 45. Rotary drive component; 46. Fin; 47. Pressure plate; 5. Cooling assembly; 51. Cold head; 52. Compressor; 53. Helium circulation pipeline; 6. Third main body; 61. Gas storage chamber; 62. Liquid storage chamber; 7. First helium pipeline; 8. Second helium pipeline; 9. Third helium pipeline; 10. Expansion tube; 11. Fourth main body; 12. Fifth main body; 13. Sixth main body; 14. First extraction pipe; 15. First extraction pump; 16. Second extraction pipe; 17. Third extraction pipe; 18. Second extraction pump; 19. Superconducting magnet assembly; 20. Helium cylinder. Detailed Implementation

[0031] The technical solution of the present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0032] In the following certain exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the present application. Therefore, the drawings and descriptions are to be regarded as illustrative in nature and not as restrictive.

[0033] In the description of the embodiments of the present application, it needs to be understood that the terms "length", "inner", and the like indicated orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the embodiments of the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0034] In addition, the terms "first", "second", etc. are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0035] In the embodiments of the present application, unless otherwise explicitly specified and limited, the "on" or "under" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "on", "above" and "above" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "under", "below" and "below" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0036] The following disclosure provides many different embodiments or examples for implementing different structures of the embodiments of the present application. In order to simplify the disclosure of the embodiments of the present application, the components and arrangements of specific examples are described in the following. Of course, they are only examples, and the purpose is not to limit the embodiments of the present application. In addition, the embodiments of the present application can refer to the same reference numerals and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0037] Referring to Figures 1-3As shown, the embodiment provides a low-temperature measuring system, which comprises a first body 1 with a first cavity, a first container 2 arranged in the first body 1, a second body 3 with a second cavity arranged in the first body 1, and a plug rod assembly 4 arranged in the second body 3 and loaded with a sample table 43, the second body 3 being arranged above the first container 2, and the plug rod assembly 4 being used for connecting the first container 2.

[0038] Referring to Figure 4 As shown, the plug rod assembly 4 comprises a hollow rod body 41, a rotary driving member 45 connected to the upper end of the rod body 41, a rod head 42 communicated with the lower end of the rod body 41, a locking mechanism 44 arranged at the lower end of the rod head 42 and used for locking with the upper end of the first container 2, and the sample table 43 being arranged in the rod head 42.

[0039] The plug rod assembly 4 further comprises a fin 46 sleeved on the rod body 41 and a pressing plate 47 used for pressing the fin 46 downward on the upper end of the rod head 42, the fin 46 being used for heat exchange to improve the cooling effect on the sample table 43.

[0040] The rotary driving member 45 is located outside the first body 1, and by rotating the rotary driving member 45, the rod head 42 is locked with the first container 2 to form a cold guide surface therebetween to guide and cool the sample table 43 through liquid helium and helium gas in the first container 2.

[0041] The low-temperature measuring system further comprises a superconducting magnet assembly 19 arranged in the first body 1 and surrounding the outside of the sample table 43 to improve the strength of the strong magnetic field according to the measurement requirement. The superconducting magnet assembly 19 is composed of a magnet winding, an HTC lead, a large-current electric feedthrough, and a magnet power supply. The magnet power supply has a maximum power supply capacity of 100 A and has a quench protection function. A strong magnetic field with a maximum field strength of 9.2 T and a central 9 T field strength is formed at a magnetic field center aperture of 70 mm, and the center 10 mm magnetic field uniformity reaches 0.1%.

[0042] The plug rod assembly 4 further comprises a control unit, a temperature sensor, and a heating resistor arranged on the sample table 43, the temperature sensor and the heating resistor being electrically connected with the control unit, and the control unit being used for controlling the heating power of the heating resistor according to the temperature signal fed back by the temperature sensor. In the embodiment, the control unit is a temperature controller, which is used for realizing continuous temperature variation from 1.8 K to 300 K according to the measurement requirement. When the temperature is lower than 5 K, the temperature fluctuation is not more than 10 mK; when the temperature is lower than 20 K, the temperature fluctuation is not more than 20 mK; and when the temperature is higher than 20 K, the temperature fluctuation is not more than 50 mK, and the temperature stability is good.

[0043] The low-temperature measuring system further comprises a refrigeration assembly 5, which comprises a cold head 51 inserted into the first body 1, a compressor 52 located outside the first body 1, and a helium circulation pipeline 53 connected between the compressor 52 and the cold head 51.

[0044] Referring to Figure 5 As shown in the drawings, the first body 1 is provided with a third body 6 for accommodating the cold head 51 and having a third cavity. The low-temperature measuring system further comprises a first helium pipeline 7, a second helium pipeline 8, and a third helium pipeline 9. The first helium pipeline 7 is in communication with the third cavity.

[0045] Through the above arrangement, the helium in the first helium pipeline 7 can be stored in the third body 6 and liquefied to form liquid helium under the long-time action of the cold head 51, so as to form a liquid helium interlayer between the cold head 51 and the third body 6.

[0046] The second helium pipeline 8 enters the third body 6 along the gas inlet direction, winds around the outside of the cold head 51, and then extends out of the third body 6 and is in communication with the first container 2. Through this arrangement, the helium in the second helium pipeline 8, which is cooled by the cold head 51 and the liquid helium interlayer, enters the first container 2 to cool the sample table 43.

[0047] The third helium pipeline 9 enters the third body 6 along the gas inlet direction, winds around the outside of the cold head 51, and then extends out of the third body 6 and is in communication with the first container 2 through the expansion pipe 10. Through this arrangement, the helium in the third helium pipeline 9, which is cooled by the cold head 51 and the liquid helium interlayer, enters the expansion pipe 10, which is used to further cool the helium to obtain liquid helium. The helium flows slowly in the expansion pipe 10 and can be liquefied to obtain liquid helium. The liquid helium entering the first container 2 can further cool the sample table 43.

[0048] In this embodiment, the second helium pipeline 8 and the third helium pipeline 9 are respectively spirally wound on the inner surface of the third body 6, and the two are alternately wound in sequence. The second helium pipeline 8 and the third helium pipeline 9 are respectively fixedly connected to the inner surface of the third body 6, and the three are integrally formed to avoid interference caused by the insertion and extraction of the cold head 51, and can effectively protect the second helium pipeline 8 and the third helium pipeline 9.

[0049] The low-temperature measuring system further comprises a sixth body 13 arranged around the outside of the second body 3, and the sixth body 13 has a sixth cavity between the inner side of the sixth body 13 and the outer side of the second body 3, which is in communication with the first container 2. The helium in the first container 2, which is heated after heat exchange, enters the sixth cavity upward, and the fins 46 are located in the sixth cavity.

[0050] In the embodiment, the third helium pipeline 9 extends out of the third main body 6, and then passes through the expansion pipe 10 to be in communication with the first container 2. Through the arrangement, the helium in the third helium pipeline 9 can be cooled by the helium in the sixth cavity and then be cooled in the expansion pipe 10, so that the cooling efficiency is further improved.

[0051] In the embodiment, the lowest temperature of the liquid helium prepared by the low-temperature measuring system is not higher than 1.8K, and the cooling time from 300K to 1.8K is not more than 40 minutes.

[0052] The low-temperature measuring system further comprises a first air pump 15 located outside the first main body 1 and in communication with the sixth cavity through the first air pipeline 14, and the sixth main body 13 extends out of the first main body 1, and the first air pipeline 14 is located outside the first main body 1.

[0053] Since the outer diameter of the second main body 3 and the inner diameter of the sixth main body 13 are relatively close, the air flow of the first air pipeline 14 is relatively small. As shown in Figure 3 In order to improve the air flow efficiency, the low-temperature measuring system further comprises a second air pipeline 16 in communication between the sixth cavity and the first air pump 15, and one end of the second air pipeline 16 is located at the bottom of the sixth cavity, so as to improve the air flow efficiency and ensure the continuous measurement.

[0054] As shown in Figure 2 The third cavity comprises a gas storage cavity 61 and a liquid storage cavity 62 in sequence from top to bottom, and the liquid helium liquefied from the helium gas layer is accumulated in the lower liquid storage cavity 62, and the helium gas is left in the upper gas storage cavity 61.

[0055] The first main body 1 is provided with a fourth main body 11 for accommodating the first container 2 and the sample table 43 and being penetrated by the second main body 3, and the fourth main body 11 abuts against the liquid storage cavity 62 located outside the fourth main body 11. In the embodiment, the fourth main body 11 abuts against the bottom of the liquid storage cavity 62, so as to form the first layer of heat preservation for the sample table 43 in the liquid storage cavity 62 through the temperature of the liquid storage cavity 62.

[0056] The first main body 1 is further provided with a fifth main body 12 for accommodating the fourth main body 11 and the sample table 43 and being penetrated by the second main body 3, and the fifth main body 12 abuts against the gas storage cavity 61 located outside the fifth main body 12. In the embodiment, the fifth main body 12 abuts against the bottom of the gas storage cavity 61, so as to form the second layer of heat preservation for the sample table 43 in the gas storage cavity 61 through the temperature of the gas storage cavity 61.

[0057] The double-layer heat preservation does not need to use an additional cold source, and can achieve good heat insulation effect, so as to ensure the stability of the temperature.

[0058] The low-temperature measuring system further comprises a second evacuation pump 18 in communication with the second cavity through a third evacuation pipe 17 and located outside the first body 1, which is used to ensure the vacuum degree of the space where the sample table 43 is located to meet the measuring conditions.

[0059] The working process of the embodiment is specifically described as follows:

[0060] The first helium pipe 7, the second helium pipe 8 and the third helium pipe 9 are respectively supplied with helium by an external helium cylinder 20;

[0061] Before starting the measurement, the first helium pipe 7 is opened to form a liquid helium interlayer between the cold head 51 and the third body 6;

[0062] Then, the sample is placed in the sample table 43, the insertion rod assembly 4 is inserted into the second body 3, the insertion rod assembly 4 is locked on the first container 2, and the second cavity and the sixth cavity are respectively evacuated;

[0063] Then, the second helium pipe 8 and the third helium pipe 9 are opened, the sample is rapidly pre-cooled by helium in the second helium pipe 8, and the sample is further cooled by liquid helium obtained in the third helium pipe 9;

[0064] Finally, the temperature and the magnetic field at the sample table 43 are adjusted according to the measuring requirements.

[0065] The above embodiment is only used to illustrate the technical concept and characteristics of the present application, and its purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A low-temperature measurement system, characterized in that: The device includes a first main body having a first cavity, a first container disposed in the first main body, a second main body having a second cavity and passing through the first main body, and a plug-in assembly disposed in the second main body and loaded with a sample stage. The second main body is located directly above the first container, and the plug-in assembly is used to connect to the first container. The low-temperature measurement system further includes a refrigeration component, which includes a cold head inserted into the first main body; The first main body is provided with a third main body for housing the cold head and having a third cavity; the cryogenic measurement system also includes a first helium pipeline, a second helium pipeline and a third helium pipeline. The first helium gas pipeline is connected to the third cavity; The second helium gas pipeline first enters the third body along the gas inlet direction and is arranged around the outside of the cold head, then extends out of the third body and connects with the first container; The third helium gas pipeline first enters the third main body along the gas inlet direction and is arranged around the outside of the cold head, then extends out of the third main body and connects to the first container after passing through the expansion tube; The third cavity includes a gas storage cavity and a liquid storage cavity connected sequentially from top to bottom; The first body is provided with a fourth body for receiving the first container and penetrated by the second body, the fourth body abutting against the liquid storage cavity located outside it; The first body is further provided with a fifth body for accommodating the fourth body and penetrated by the second body, the fifth body abutting against the gas storage cavity located outside it.

2. The low-temperature measurement system according to claim 1, characterized in that: The second helium gas pipeline and the third helium gas pipeline are respectively spirally pressed against the inner surface of the third main body.

3. The low-temperature measurement system according to claim 1, characterized in that: After the third helium gas pipeline extends out of the third main body, it first winds around the outside of the second main body, and then connects to the first container after passing through the expansion tube.

4. The low-temperature measurement system according to claim 1, characterized in that: The cryogenic measurement system further includes a sixth body surrounding the second body, and a sixth cavity communicating with the first container is located between the inner side of the sixth body and the outer side of the second body. The cryogenic measurement system also includes a first suction pump that is connected to the sixth cavity through a first suction pipe and is located outside the first main body. The sixth main body extends upward through the first main body, and the first suction pipe is located outside the first main body.

5. The low-temperature measurement system according to claim 4, characterized in that: The cryogenic measurement system also includes a second suction pipe connecting the sixth chamber and the first suction pump, with one end of the second suction pipe located at the bottom of the sixth chamber.

6. The low-temperature measurement system according to claim 1, characterized in that: The cryogenic measurement system also includes a second air pump that is connected to the second cavity via a third air extraction pipe and is located outside the first main body.

7. The cryogenic measurement system according to claim 1, characterized in that: The cryogenic measurement system also includes a superconducting magnet assembly disposed in the first main body and surrounding the sample stage.

8. The low-temperature measurement system according to claim 1, characterized in that: The insertion rod assembly includes a hollow rod body, a rod head connected to the lower end of the rod body, and a locking mechanism located at the lower end of the rod head for locking with the upper end of the first container. The sample stage is located in the rod head.

9. The cryogenic measurement system according to claim 1, characterized in that: The insertion rod assembly also includes a control unit, a temperature sensor and a heating resistor disposed on the sample stage. The temperature sensor and the heating resistor are electrically connected to the control unit, which controls the heating power of the heating resistor based on the temperature signal fed back by the temperature sensor.

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