A thermal load magnetic suspension test device and method for superconducting cold stage infrared detector

Abstract

The present invention relates to the field of infrared detector technology, and specifically to a thermal load magnetic levitation test device and method for a superconducting cold stage infrared detector. The device includes: a magnetic tooling base, in which a first thermal radiation component is provided; a tooling cover, which is arranged on the magnetic tooling base, in which a second thermal radiation component is provided; a superconducting component, which is arranged in a dewar to be tested, and the dewar is suspended in a vacuum cavity formed by the tooling cover and the magnetic tooling base through the superconducting component; a weighing table, on which the magnetic tooling base is arranged, and the weighing table is used to sense mass change data, obtain the volatilization rate of liquid nitrogen in the dewar according to the mass change data, and calculate the sealing test result of the dewar. The present invention adopts superconducting magnetic levitation technology to realize non-contact, zero solid thermal conduction test of thermal load, and quantitatively provide controllable thermal radiation, which can accurately and quickly evaluate the vacuum performance of the dewar.

Description

Technical Field

[0001] The invention relates to the technical field of infrared detectors, and in particular to a thermal load magnetic suspension testing device and method for a superconducting cold stage infrared detector. Background Art

[0002] At present, the method to measure the vacuum performance of the dewar is to place the dewar on the tooling for thermal load testing. Thermal load: remove the dewar from the refrigerator and inject liquid nitrogen into the cold finger cylinder; test the evaporation rate of liquid nitrogen to conduct a qualitative analysis of the air tightness of the dewar. The evaporation rate of the dewar with good sealing performance is low; the evaporation rate of the dewar with poor sealing performance is high.

[0003] At present, the vacuum degree detection in the refrigerated infrared detector is often carried out by applying heat load to the dewar to obtain a qualitative result of whether the dewar has a large amount of air leakage. Heat load is a measurement of heat exchange achieved by "transporting cold into the cold finger and inputting heat into the dewar shell". However, due to the influence of gravity, the dewar has to contact other objects to generate a greater heat load during the test of heat load; this is somewhat different from the actual heat load value of the dewar. In addition, external temperature fluctuations and changes in light radiation intensity also have a significant impact on the volatilization rate of low-temperature liquid nitrogen (-196℃) in the dewar cold finger. Summary of the invention

[0004] The purpose of the present invention is to provide a thermal load magnetic levitation test device for a superconducting cold stage infrared detector to solve the above technical problems; the purpose of the present invention is also to provide a thermal load magnetic levitation test method for a superconducting cold stage infrared detector to solve the above technical problems.

[0005] The technical problem solved by the present invention can be achieved by adopting the following technical scheme: a thermal load magnetic levitation test device for a superconducting cold stage infrared detector, comprising: a magnetic tooling base, in which a first heat radiation component is arranged; a tooling cover, which is arranged on the magnetic tooling base, in which a second heat radiation component is arranged; a superconducting component, which is arranged in a dewar to be tested, and the dewar is suspended in a vacuum cavity formed by the tooling cover and the magnetic tooling base through the superconducting component; a weighing table, in which the magnetic tooling base is arranged, and the weighing table is used to sense mass change data, obtain the volatilization rate of liquid nitrogen in the dewar according to the mass change data, and calculate the sealing test result of the dewar.

[0006] Preferably, the cold head of the Dewar is arranged toward the magnetic tooling base located below, liquid nitrogen is arranged in the cold finger cylinder of the Dewar, the cold head of the Dewar includes a cold stage, a substrate and a cold shield, and the superconducting component is at least one of the cold stage, the substrate and the cold shield made of a material that is superconducting in the liquid nitrogen temperature range.

[0007] Preferably, it also includes a heat convection generator, which is connected to the vacuum chamber and is used to transport heat convection to the surface of the Dewar, and the magnetic tooling base is provided with heat convection outlet holes.

[0008] Preferably, the heat convection generator includes a pressure bottle and a heating body, the outlet of the pressure bottle is connected to the magnetic tooling base through a first flexible tube, the heating body is arranged in the first flexible tube, a pressure valve is provided on the front side of the outlet of the pressure bottle, and at least a portion of the first flexible tube close to the pressure bottle is connected to the first fixed platform.

[0009] Preferably, a vacuum pump is further included, which is connected to the vacuum cavity and is used to continuously evacuate the vacuum cavity.

[0010] Preferably, a liquefied adsorption chamber is provided on the tooling cover, the position of the liquefied adsorption chamber corresponds to the liquid nitrogen volatilization port of the Dewar, the vacuum chamber is connected to the vacuum pump through the liquefied adsorption chamber, the liquefied adsorption chamber is used to adsorb condensed liquid generated in the vacuum chamber, and the liquefied adsorption chamber has a super hydrophilic surface formed by laser etching.

[0011] Preferably, the vacuum pump is connected to the liquefied adsorption chamber via a second flexible tube, and at least a portion of the second flexible tube close to the vacuum pump is connected to a second fixing platform.

[0012] Preferably, the first heat radiation component and the second heat radiation component are controllable heating resistance wires.

[0013] A method for testing the thermal load of a superconducting cold stage infrared detector by magnetic levitation, which is applied to the device for measuring the thermal load of the superconducting magnetic levitation infrared detector, comprises: step S0, adding liquid nitrogen into the dewar and cooling the dewar to the superconducting temperature of the superconducting component; step S1, moving the dewar to the top of the magnetic tooling base, and suspending the dewar above the magnetic tooling base through the superconducting component; step S2, coupling the tooling cover to the magnetic tooling base to form the vacuum cavity, and controlling the first heat radiation component and the second heat radiation component to generate heat radiation; step S3, recording mass change data through the weighing table, obtaining the volatilization rate of the liquid nitrogen in the dewar according to the mass change data, and calculating the sealing test result of the dewar.

[0014] Preferably, step S2 further comprises using a heat convection generator to transport heat convection to the surface of the Dewar.

[0015] The beneficial effects of the present invention are as follows: due to the adoption of the above technical scheme, the present invention adopts superconducting magnetic levitation technology to realize non-contact, zero solid heat conduction testing of heat load; utilizes a magnetic tooling base and a tooling cover to cover the dewar to shield external heat radiation; and quantitatively provides controllable heat radiation, so that the vacuum performance of the dewar can be accurately and quickly evaluated. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the Dewar refrigeration stage in an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the structure of a magnetic tooling base in an embodiment of the present invention;

[0018] Figure 3 Schematic diagram of a vacuum chamber in an embodiment of the present invention;

[0019] Figure 4 Schematic diagram of super-hydrophilic surface microstructure in an embodiment of the present invention;

[0020] Figure 5 Schematic diagram of the steps of the thermal load magnetic suspension test method for the superconducting cold stage infrared detector in an embodiment of the present invention.

[0021] In the attached drawings: 1. Magnetic tooling base; 11. First heat radiation component; 12. Thermal convection outlet hole; 2. Tooling cover; 21. Second heat radiation component; 3. Vacuum chamber; 41. Liquid nitrogen; 42. Liquid nitrogen thermos cup; 43. Liquid nitrogen funnel; 5. Dewar; 51. Cold finger cylinder; 52. Cold head; 53. Cold stage; 54. Base plate; 55. Cold screen; 6. Thermal convection generator; 61. Air pressure bottle; 62. Pressure valve; 63. Heating body; 64. First flexible tube; 71. Vacuum pump; 72. Second flexible tube; 8. Liquefaction adsorption chamber; 81. Super hydrophilic surface; 9. Refrigeration tooling. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0025] A thermal load magnetic suspension test device for superconducting cold stage infrared detector, such as Figures 1 to 4 As shown, it includes a magnetic tooling base 1, in which a first heat radiation component 11 is provided; a tooling cover 2, which is arranged on the magnetic tooling base 1, in which a second heat radiation component 21 is provided; a superconducting component, which is arranged in the dewar 5 to be tested, and the dewar 5 is suspended in the vacuum cavity 3 formed by the tooling cover 2 and the magnetic tooling base 1 through the superconducting component; a weighing table, on which the magnetic tooling base 1 is arranged, and the weighing table is used to sense mass change data, obtain the volatilization rate of the liquid nitrogen 41 in the dewar 5 according to the mass change data, and calculate the sealing test result of the dewar 5.

[0026] In view of the defect in the prior art that the Dewar 5 has to contact other objects to generate a larger heat load during the test of the heat load, resulting in a certain difference from the actual heat load value of the Dewar 5, the present invention adopts a magnetic tooling base 1 made of a strong magnet to provide a stable magnetic field environment, and utilizes the pinning effect of superconducting materials. The Dewar 5 can be suspended in the air without contacting any solid, thereby achieving zero heat conduction with the outside world.

[0027] Specifically, the present invention conducts a qualitative analysis on the air tightness of the Dewar 5 by testing the volatilization rate of the liquid nitrogen 41: the volatilization rate of the Dewar 5 with good sealing performance is low; the volatilization rate of the Dewar 5 with poor sealing performance is high.

[0028] First, the Dewar 5 is placed on the refrigeration tooling, the liquid nitrogen funnel 43 is inserted into the cold finger cylinder 51 of the Dewar 5, and the liquid nitrogen 41 in the liquid nitrogen thermos cup 42 is introduced into the liquid nitrogen funnel 43 and flows into the cold finger cylinder 51. The Dewar 5 is left to stand for a period of time, 30 seconds in this embodiment, and the cold head 52 of the Dewar 5, including the cold stage 53, the substrate 54 and the cold shield 55, is cooled to a high-temperature superconducting temperature of 77k, and the outer wall of the Dewar 5 is not frosted at this time. During the standing process, the first heat radiation component 11 in the magnetic tooling base 1 and the second heat radiation component 21 in the tooling cover 2 are turned on for heating, and the outer shell of the vacuum chamber 3 is heated to the experimental required temperature, for example, -20°C~90°C.

[0029] The present invention utilizes a magnetic tooling base 1 and a tooling cover 2 to cover the dewar 5 to shield external heat radiation; and utilizes a first heat radiation component 11 and a second heat radiation component 21 to quantitatively provide controllable heat radiation to measure the heat load under actual application conditions. The inner wall surface temperature of the device of the present invention, that is, the amount of environmental heat radiation of the dewar 5, can be controlled only by controlling the first heat radiation component 11 and the second heat radiation component 21 in the device of the present invention.

[0030] The weighing table uses a 0.00001g high-precision scale and is placed on an optical platform for experiments to ensure that it is on a horizontal surface. The vibration of the device of the present invention is very small. The mass change data is sensed by the weighing table, and the volatilization rate of the liquid nitrogen 41 in the Dewar 5 is obtained according to the mass change data. The sealing test result of the Dewar 5 is calculated: the volatilization rate of the Dewar 5 with good sealing performance is low; the volatilization rate of the Dewar 5 with poor sealing performance is high.

[0031] In the present invention, the time used and the corresponding mass change are recorded in real time, and the heat load value is calculated by the formula. The formula is as follows:

[0032]

[0033] in, is the heat load value, is the latent heat of vaporization of liquid nitrogen, is the evaporation rate of liquid nitrogen.

[0034] The device for measuring the heat load of infrared detectors by superconducting magnetic levitation in the present invention can accurately and quickly evaluate the vacuum performance of Dewar 5.

[0035] In a preferred embodiment, the cold head 52 of the Dewar 5 is arranged toward the magnetic tooling base 1 located below, liquid nitrogen 41 is arranged in the cold finger cylinder 51 of the Dewar 5, the cold head 52 of the Dewar 5 includes a cold stage 53, a substrate 54 and a cold shield 55, and the superconducting component is at least one of the cold stage 53, the substrate 54 and the cold shield 55 made of a material that is superconducting in the liquid nitrogen temperature zone.

[0036] At least one of the materials of the cold stage 53, the substrate 54 and the cold shield 55 in the cold head 52 of the Dewar 5 needs to use a high-temperature superconducting material in the liquid nitrogen temperature zone, such as yttrium barium copper oxide, bismuth strontium calcium copper oxide and nickel oxide compound superconductors.

[0037] During the cooling stage of Dewar 5, Dewar 5 is placed on a refrigeration tool, a liquid nitrogen funnel 43 is inserted into the cold finger cylinder 51 of Dewar 5, liquid nitrogen 41 is introduced into the liquid nitrogen funnel 43 and flows into the cold finger cylinder 51, Dewar 5 is left to stand for 30 seconds, and the cold head 52 of Dewar 5, including the cold stage 53, the substrate 54 and the cold shield 55, is cooled to a high-temperature superconducting temperature of 77K.

[0038] By utilizing the pinning effect of superconducting materials, the Dewar 5 can be suspended in the air without contacting any solid, thereby achieving zero heat conduction with the outside world. The magnetic tooling base 1 is used to provide a stable magnetic field environment.

[0039] In a preferred embodiment, it also includes a heat convection generator 6, which is connected to the vacuum chamber 3 and is used to transport heat convection to the surface of the Dewar 5. The magnetic tooling base 1 is provided with a heat convection outlet hole 12, and the heat convection outlet hole 12 is used to discharge the heat convection.

[0040] Specifically, there are three ways of heat transfer: heat conduction, heat radiation and heat convection; the present invention utilizes the pinning effect of superconducting materials, and the Dewar 5 can be suspended in the air without contacting any solid, thereby achieving zero heat conduction with the outside world; the first heat radiation component 11 and the second heat radiation component 21 are used to achieve precise and controllable heat radiation conduction; the heat convection generator 6 is used to achieve precise and controllable heat convection conduction, thereby achieving precise control of the three heat transfer modes: heat conduction, heat radiation and heat convection, thereby achieving precise temperature measurement of the heat load of the Dewar 5.

[0041] In a preferred embodiment, the heat convection generator 6 includes a pressure bottle 61 and a heating body 63. The outlet of the pressure bottle 61 is connected to the magnetic tooling base 1 through a first flexible tube 64. The heating body 63 is arranged in the first flexible tube 64. A pressure valve 62 is provided on the front side of the outlet of the pressure bottle 61. At least a portion of the first flexible tube 64 close to the pressure bottle 61 is connected to the first fixed platform.

[0042] Specifically, the present invention stably delivers high-purity nitrogen to the vacuum chamber 3 through the air pressure bottle 61, and the pressure valve 62 is used to monitor the amount of nitrogen. Since the air pressure bottle 61 will vibrate during the gas delivery process, in order to avoid the influence of vibration, the present invention directly mechanically connects and fixes the air pressure bottle 61 and / or at least a portion of the first flexible tube 64 close to the air pressure bottle 61 to the first fixed platform. In this embodiment, the first fixed platform is marble.

[0043] More specifically, the first flexible tube 64 is a corrugated tube, and the air pressure bottle 61 of the present invention is connected to the vacuum cavity 3 through the corrugated tube, which can hinder the propagation of vibration.

[0044] The heating body 63 is disposed in the first flexible tube 64 and is used for heating the high-purity nitrogen. In the present invention, the heating body 63 adopts a heating resistance wire to provide a stable and controllable heating function.

[0045] In a preferred embodiment, a vacuum pump 71 is further included, which is connected to the vacuum chamber 3 and is used to continuously evacuate the vacuum chamber 3 .

[0046] Specifically, the present invention evacuates the vacuum chamber 3 through the vacuum pump 71 to prevent frost on the surface of the Dewar 5. While evacuating, the pressure bottle 61 begins to stably deliver high-purity nitrogen into the vacuum chamber 3 at a pressure of 0.1 Pa, and the heater 63 heats the high-purity nitrogen.

[0047] In a preferred embodiment, a liquefied adsorption chamber 8 is provided on the tooling cover 2, and the position of the liquefied adsorption chamber 8 corresponds to the liquid nitrogen volatilization port of the Dewar 5. The vacuum chamber 3 is connected to the vacuum pump 71 through the liquefied adsorption chamber 8. The liquefied adsorption chamber 8 is used to adsorb the condensed liquid produced in the vacuum chamber 3, and the liquefied adsorption chamber 8 has a super hydrophilic surface 81 formed by laser etching.

[0048] In the prior art, during the liquid nitrogen refrigeration process, the cold finger cylinder contacts the air, and the water in the air is cooled and frosted, which greatly reduces the test accuracy of the mass change rate.

[0049] Specifically, the present invention couples and seals the tooling cover 2 with the magnetic tooling base 1, turns on the vacuum pump 71, and evacuates the interior of the tooling to prevent frost on the surface of the Dewar 5. The inner surface of the liquefied adsorption chamber 8 is laser-etched to obtain a super-hydrophilic surface 81, and the laser-etched pattern is a grid microstructure with a range of 10 μm to 50 μm and a depth of 5 μm to 40 μm.

[0050] Since the interior of the vacuum chamber 3 formed by the coupling and sealing of the tooling cover 2 and the magnetic tooling base 1 is not an absolute vacuum, there is still water vapor inside that may re-condense at the liquid nitrogen volatilization port of the Dewar 5. The liquefied adsorption chamber 8 is arranged corresponding to the position of the liquid nitrogen volatilization port of the Dewar 5. The super-hydrophilic surface 81 of the liquefied adsorption chamber 8 has a stronger ability to capture condensed liquid than ordinary unprocessed surfaces. The super-hydrophilic surface 81 of the liquefied adsorption chamber 8 can prevent the liquid from condensing on the surface of the Dewar 5, affecting the thermal load and thermal mass of the Dewar 5.

[0051] Preferably, the present invention provides stable heat convection by evacuating the vacuum chamber 3 and the air pressure bottle 61, and the evacuation combined with the liquefied adsorption chamber 8 can effectively prevent the condensation of liquid into frost on the surface of the Dewar 5, thereby ensuring the accuracy of the heat load test results.

[0052] In a preferred embodiment, the vacuum pump 71 is connected to the liquefied adsorption chamber 8 via a second flexible tube, and at least a portion of the second flexible tube close to the vacuum pump 71 is connected to the second fixing platform.

[0053] Specifically, the present invention continuously evacuates the vacuum chamber 3 through the vacuum pump 71. Since the vacuum pump 71 will vibrate during the evacuation process, in order to avoid the influence of vibration, the present invention directly mechanically connects and fixes the vacuum pump 71 and / or at least a portion of the second flexible tube close to the vacuum pump 71 on the second fixed platform. In this embodiment, the second fixed platform is marble.

[0054] More specifically, the second flexible tube is a corrugated tube, and the vacuum pump 71 of the present invention is connected to the vacuum cavity 3 through the corrugated tube, which can hinder the propagation of vibration.

[0055] In a preferred embodiment, the first heat radiation component 11 and the second heat radiation component 21 are controllable heating resistance wires.

[0056] Specifically, the first heat radiation component 11 and the second heat radiation component 21 both use heating resistance wires, which are used to quantitatively provide controllable heat radiation to measure the heat load under actual application conditions.

[0057] A method for testing the thermal load of a superconducting cold-stage infrared detector by magnetic levitation is applied to a device for measuring the thermal load of a superconducting magnetic levitation infrared detector in any one of the embodiments, such as Figure 5 As shown, it includes step S0, adding liquid nitrogen 41 into the Dewar 5 and cooling the Dewar 5 to the superconducting temperature of the superconducting component; step S1, moving the Dewar 5 above the magnetic tooling base 1, and the Dewar 5 is suspended above the magnetic tooling base 1 through the superconducting component; step S2, coupling the tooling cover 2 to the magnetic tooling base 1 to form a vacuum cavity 3, controlling the first heat radiation component 11 and the second heat radiation component 21 to generate heat radiation; step S3, recording the mass change data through the weighing table, obtaining the volatilization rate of the liquid nitrogen 41 in the Dewar 5 according to the mass change data, and calculating the sealing test result of the Dewar 5.

[0058] Specifically, the present invention conducts a qualitative analysis on the air tightness of the Dewar 5 by testing the volatilization rate of the liquid nitrogen 41: the volatilization rate of the Dewar 5 with good sealing performance is low; the volatilization rate of the Dewar 5 with poor sealing performance is high.

[0059] First, the Dewar 5 is placed on the refrigeration tooling, the liquid nitrogen funnel 43 is inserted into the cold finger cylinder 51 of the Dewar 5, and the liquid nitrogen 41 is introduced into the liquid nitrogen funnel 43 and flows into the cold finger cylinder 51. The Dewar 5 is left to stand for a period of time, 30 seconds in this embodiment, and the cold head 52 of the Dewar 5, including the cold stage 53, the substrate 54 and the cold shield 55, is cooled to a high-temperature superconducting temperature of 77k, and the outer wall of the Dewar 5 is not frosted at this time. During the standing process, the first heat radiation component 11 in the magnetic tooling base 1 and the second heat radiation component 21 in the tooling cover 2 are turned on for heating, and the outer shell of the vacuum chamber 3 is heated to the experimental required temperature, for example, -20°C~90°C.

[0060] The present invention utilizes a magnetic tooling base 1 and a tooling cover 2 to cover the dewar 5 to shield external heat radiation; and utilizes a first heat radiation component 11 and a second heat radiation component 21 to quantitatively provide controllable heat radiation to measure the heat load under actual application conditions. The inner wall surface temperature of the device, that is, the amount of environmental heat radiation of the dewar 5, can be controlled only by controlling the first heat radiation component 11 and the second heat radiation component 21 in the device.

[0061] The weighing table uses a 0.00001g high-precision scale and is placed on an optical platform for experiments to ensure that it is on a horizontal surface. The vibration of the device of the present invention is very small. The mass change data is sensed by the weighing table, and the volatilization rate of the liquid nitrogen 41 in the Dewar 5 is obtained according to the mass change data. The sealing test result of the Dewar 5 is calculated: the volatilization rate of the Dewar 5 with good sealing performance is low; the volatilization rate of the Dewar 5 with poor sealing performance is high.

[0062] In the present invention, the time used and the corresponding mass change are recorded in real time, and the heat load value is calculated by the formula. The formula is as follows:

[0063]

[0064] in, is the heat load value, is the latent heat of vaporization of liquid nitrogen, is the evaporation rate of liquid nitrogen.

[0065] The device for measuring the heat load of infrared detectors by superconducting magnetic levitation in the present invention can accurately and quickly evaluate the vacuum performance of Dewar 5.

[0066] More specifically, the cold head 52 of the Dewar 5 is arranged toward the magnetic tooling base 1 located below, liquid nitrogen 41 is arranged in the cold finger cylinder 51 of the Dewar 5, the cold head 52 of the Dewar 5 includes a cold stage 53, a substrate 54 and a cold shield 55, and the superconducting component is at least one of the cold stage 53, the substrate 54 and the cold shield 55 made of a material that is superconducting in the liquid nitrogen temperature zone.

[0067] At least one of the materials of the cold stage 53, the substrate 54 and the cold shield 55 in the cold head 52 of the Dewar 5 needs to use a high-temperature superconducting material in the liquid nitrogen temperature zone, such as yttrium barium copper oxide, bismuth strontium calcium copper oxide and nickel oxide compound superconductors.

[0068] In step S0, during the cooling stage of Dewar 5, Dewar 5 is placed on a refrigeration tool, a liquid nitrogen funnel 43 is inserted into the cold finger cylinder 51 of Dewar 5, liquid nitrogen 41 is introduced into the liquid nitrogen funnel 43 and flows into the cold finger cylinder 51, Dewar 5 is left to stand for 30 seconds, and the cold head 52 of Dewar 5, including the cold stage 53, the substrate 54 and the cold shield 55, is cooled to a high-temperature superconducting temperature of 77K.

[0069] In subsequent steps S1 to S3, the pinning effect of the superconducting material is utilized, and the Dewar 5 can be suspended in the air without contacting any solid, thereby achieving zero heat conduction with the outside world. The magnetic tooling base 1 is used to provide a stable magnetic field environment.

[0070] In a preferred embodiment, step S2 further includes using a heat convection generator 6 to transport heat convection to the surface of the Dewar 5 .

[0071] Specifically, there are three ways of heat transfer: heat conduction, heat radiation and heat convection; the present invention utilizes the pinning effect of superconducting materials, and the Dewar 5 can be suspended in the air without contacting any solid, thereby achieving zero heat conduction with the outside world; the first heat radiation component 11 and the second heat radiation component 21 are used to achieve precise and controllable heat radiation conduction; the heat convection generator 6 is used to achieve precise and controllable heat convection conduction, thereby achieving precise control of the three heat transfer modes: heat conduction, heat radiation and heat convection, thereby achieving precise temperature measurement of the heat load of the Dewar 5.

[0072] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A thermal load magnetic suspension test device for a superconducting cold head infrared detector, characterized in that: include, A magnetic tooling base (1), wherein a first heat radiation component (11) is provided in the magnetic tooling base (1); A tooling cover (2) is arranged on the magnetic tooling base (1), and a second heat radiation component (21) is arranged inside the tooling cover (2); A superconducting component is arranged in a dewar (5) to be tested, wherein the dewar (5) is suspended in a vacuum cavity (3) formed by the tooling cover (2) and the magnetic tooling base (1) through the superconducting component; A weighing table, the magnetic tooling base (1) is arranged on the weighing table, the weighing table is used to sense mass change data, obtain the volatilization rate of liquid nitrogen in the dewar (5) according to the mass change data, and calculate the sealing test result of the dewar (5); The cold head (52) of the dewar (5) is arranged toward the magnetic tooling base (1) located below, liquid nitrogen is arranged in the cold finger cylinder (51) of the dewar (5), the cold head (52) of the dewar (5) comprises a cold stage (53), a substrate (54) and a cold shield (55), and the superconducting component is at least one of the cold stage (53), the substrate (54) and the cold shield (55) made of a material that is superconducting in a liquid nitrogen temperature range.

2. The thermal load magnetic suspension test device of the superconducting cold head infrared detector according to claim 1 is characterized in that: It also includes a heat convection generator (6) which is in communication with the vacuum chamber (3) and is used to transport heat convection to the surface of the dewar (5); and the magnetic tooling base (1) is provided with a heat convection outlet hole (12).

3. The thermal load magnetic suspension test device of the superconducting cold head infrared detector according to claim 2 is characterized in that: The heat convection generator (6) comprises a pressure bottle (61) and a heating body (63); the outlet of the pressure bottle (61) is connected to the magnetic tooling base (1) via a first flexible tube (64); the heating body (63) is arranged in the first flexible tube (64); a pressure valve (62) is arranged in front of the outlet of the pressure bottle (61); and at least a portion of the first flexible tube (64) close to the pressure bottle (61) is connected to a first fixing platform.

4. The thermal load magnetic suspension test device of the superconducting cold head infrared detector according to claim 1, characterized in that: It also comprises a vacuum pump (71) which is in communication with the vacuum chamber (3) and is used to continuously evacuate the vacuum chamber (3).

5. The thermal load magnetic suspension test device of the superconducting cold head infrared detector according to claim 4 is characterized in that: The tooling cover (2) is provided with a liquefied adsorption chamber (8), the position of the liquefied adsorption chamber (8) corresponds to the liquid nitrogen volatilization port of the Dewar (5), the vacuum chamber (3) is connected to the vacuum pump (71) via the liquefied adsorption chamber (8), the liquefied adsorption chamber (8) is used to adsorb condensed liquid generated in the vacuum chamber (3), and the liquefied adsorption chamber (8) has a super-hydrophilic surface (81) formed by laser etching.

6. The thermal load magnetic suspension test device of the superconducting cold head infrared detector according to claim 5, characterized in that: The vacuum pump (71) is connected to the liquefaction adsorption chamber (8) via a second flexible tube (72), and at least a portion of the second flexible tube (72) close to the vacuum pump (71) is connected to a second fixing platform.

7. The thermal load magnetic suspension test device of the superconducting cold head infrared detector according to claim 1, characterized in that: The first heat radiation component (11) and the second heat radiation component (21) are controllable heating resistance wires.

8. A thermal load magnetic suspension test method for a superconducting cold head infrared detector, characterized in that: A thermal load magnetic suspension test device for a superconducting cold head infrared detector as claimed in any one of claims 1 to 7, comprising: Step S0, adding liquid nitrogen into the dewar (5) and cooling the dewar (5) to the superconducting temperature of the superconducting component; Step S1, moving the dewar (5) above the magnetic tooling base (1), wherein the dewar (5) is suspended above the magnetic tooling base (1) via the superconducting component; Step S2, coupling the tooling cover (2) to the magnetic tooling base (1) to form the vacuum chamber (3), and controlling the first heat radiation component (11) and the second heat radiation component (21) to generate heat radiation; Step S3, recording the mass change data by means of the weighing platform, obtaining the volatilization rate of the liquid nitrogen in the Dewar (5) according to the mass change data, and calculating the sealing test result of the Dewar (5).

9. The thermal load magnetic suspension test method of the superconducting cold head infrared detector according to claim 8, characterized in that: Step S2 also includes using a heat convection generator (6) to transport heat convection to the surface of the Dewar (5).

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