Device for improving micro Dewar test efficiency

Abstract

The invention relates to the technical field of micro Dewar testing, in particular to a micro Dewar testing efficiency improving device which comprises a base, a liquid nitrogen injection pipe is arranged on the outer wall of the top end of the base, a mounting groove is formed in the outer wall of one side of the base, a liquid nitrogen guide-in pipe is fixedly connected to the inner wall of the mounting groove, and the liquid nitrogen injection pipe communicates with the liquid nitrogen guide-in pipe. The system further comprises; the limiting mechanism is arranged on the outer wall of the base; the limiting mechanism comprises a micro Dewar connecting end fixedly connected to the outer wall of one side of the base. The micro Dewar is clamped and limited by guiding exhausted cold air and linkage with the movement of the limiting plate, the structural stability is improved, the micro Dewar is prevented from displacement or deformation in the rapid temperature change process, the accuracy of a test result is prevented from being affected, the clamping state can be adjusted according to the test process, and the test efficiency is improved. The introduced liquid nitrogen cools the micro Dewar, so that test data deviation caused by the reason that the temperature changes an optical path is avoided, and the test efficiency of the micro Dewar is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of micro-dewar testing, and specifically to a device for improving the testing efficiency of micro-dewars. Background Technique

[0002] In the research and development and production processes of refrigerated infrared detectors and quantum devices, as a core encapsulation component, the micro-dewar directly affects the product iteration speed and quality verification cycle, and its performance needs to be tested.

[0003] There are mainly two traditional testing schemes for refrigerated infrared detector micro-dewars: using a temporary coupling refrigerator, which will greatly increase the time and personnel costs; inverting the micro-dewar and testing its performance through a mirror reflection optical path. During this process, due to the refraction of the optical path, the test data will deviate, and it is impossible to accurately judge the performance of the micro-dewar; directly flushing into liquid nitrogen, when testing after the temperature stabilizes, there may be insufficient clamping force in the initial stage, resulting in displacement or deformation of the micro-dewar during the rapid temperature change process, affecting the accuracy of the test results and reducing the testing efficiency of the micro-dewar. Summary of the Invention

[0004] The purpose of the present invention is to provide a device for improving the testing efficiency of micro-dewars to solve the problems raised in the above background technique.

[0005] The technical solution of the present invention is: a device for improving the testing efficiency of micro-dewars, including a base. The outer wall of the top end of the base is provided with a liquid nitrogen injection pipe, and an installation groove is opened on the outer wall of one side of the base. The inner wall of the installation groove is fixedly connected with a liquid nitrogen introduction pipe. The liquid nitrogen injection pipe and the liquid nitrogen introduction pipe are communicated, and further includes;

[0006] A limiting mechanism, which is arranged on the outer wall of the base;

[0007] The limiting mechanism includes a micro-dewar connection end fixedly connected to the outer wall of one side of the base. Two circular grooves are opened on the outer wall of one side of the base. The inner wall of the circular groove is fixedly connected with a spiral tube. The outer wall of one side of the spiral tube is fixedly connected with an intake pipe, and the outer wall of the other side of the spiral tube is fixedly connected with an exhaust pipe. Exhaust holes are opened on the inner walls of both sides of the installation groove, and the exhaust pipe is fixedly connected to the inner wall of the exhaust hole. A support is fixedly connected to the inner wall of one side of the circular groove. A bimetallic plate is fixedly connected to the outer wall of the support. A telescopic plate is fixedly connected to the outer wall of the bimetallic plate. Two slide rails are arranged on the outer wall of one side of the base. A limiting plate is slidably connected to the inner walls of the two slide rails. A U-shaped frame is fixedly connected to the outer wall of the limiting plate. A rotating shaft is rotatably arranged in the inner wall of the U-shaped frame. One end of the piston rod of the telescopic plate is fixedly connected to the outer wall of the rotating shaft. A clamping groove is opened on the outer wall of one side of the limiting plate. Limiting holes are opened on the outer walls of both sides of the micro-dewar connection end. The size of the limiting plate is adapted to that of the limiting holes.

[0008] Preferably, the sizes of the micro-dewar connection end and the limiting plate are adapted to those of the micro-dewar body. The bimetallic plate is located inside the spiral tube. A one-way valve is installed on the inner wall of the air inlet pipe, and the liquid nitrogen injection pipe is arranged in a conical shape.

[0009] Preferably, reinforcing frames are fixedly connected to the outer walls on both sides of the top of the base, and the reinforcing frames are fixedly connected to the outer wall of the air inlet pipe. A collection box is fixedly connected to the outer wall on one side of the top of the base, and an air outlet pipe is arranged on one outer wall of the collection box.

[0010] Preferably, connection holes are formed in the outer walls on both sides of the collection box, and the air inlet pipe is fixedly connected to the inner walls of the connection holes. An annular frame is fixedly connected to the outer wall of the micro-dewar connection end, and an arc-shaped pipe is fixedly connected to the outer wall of the top of the annular frame. The air outlet pipe is fixedly connected to the outer wall of the top of the arc-shaped pipe.

[0011] Preferably, L-shaped pipes are fixedly connected to the outer walls on both sides of the bottom end of the arc-shaped pipe. A fixed pipe is fixedly connected to the inner wall of one side of the L-shaped pipe. An annular pipe is slidably connected to the inner wall of the annular frame, and an outer plate is fixedly connected to the outer wall of one side of the annular pipe.

[0012] Preferably, the size of the outer plate is adapted to that of the micro-dewar connection end, the size of the annular pipe is adapted to that of the annular frame, and an elastic sealing pad is fixedly connected to the outer wall of one side of the outer plate. The size of the elastic sealing pad is adapted to that of the micro-dewar body.

[0013] Preferably, two jack holes are formed in the outer walls on one side of the outer plate and the annular pipe, and the fixed pipe is slidably connected to the inner walls of the jack holes. Air outlet holes are formed in the outer wall of the annular pipe, and exhaust holes are formed in the outer wall of the annular frame. The sizes of the air outlet holes and the exhaust holes are adapted to each other.

[0014] Preferably, the limiting plates are located on both sides of the micro-dewar connection end, the L-shaped pipes are located on both sides of the outer plate, positioning holes are formed at the four corners of the outer wall of the bottom end of the base, and the size of the liquid nitrogen introduction pipe is adapted to that of the micro-dewar body.

[0015] The present invention provides a device for improving the testing efficiency of a micro-dewar by means of improvement. Compared with the prior art, the following improvements and advantages are achieved:

[0016] First: The present invention is provided with a base, a liquid nitrogen inlet pipe, a spiral pipe, a bimetallic plate, a microdewars connection end, a limiting plate and a rotating shaft. The initial output air cooling effect is stronger, the bending force of the bimetallic plate is greater, providing a stronger initial supporting force to ensure the structural stability of the microdewars in the initial stage. As the test progresses, the temperature inside the microdewars gradually stabilizes, and the output air temperature also rises, reducing the clamping force of the limiting plate, reducing the continuous mechanical stress, and reducing the risk of material fatigue damage. By slowly relaxing the clamping structure, the microdewars can better adapt to temperature changes, avoiding stress concentration or deformation caused by temperature changes. The uniform cooling of the base can prevent local overheating or uneven temperature, ensuring the stability of the test environment. By guiding the discharged cold air and linking the movement of the limiting plate to clamp and limit the microdewars, the structural stability is improved, avoiding displacement or deformation of the microdewars during rapid temperature changes and affecting the accuracy of the test results. The clamping state can also be adjusted according to the test process. The imported liquid nitrogen cools the microdewars, avoiding test data deviation caused by temperature changing the optical path, and improving the test efficiency of the microdewars;

[0017] Second: The present invention is provided with an air inlet pipe, a collection box, an outer plate, an annular pipe, an annular frame and an elastic sealing gasket. By reasonably designing the air guiding path and the pushing structure of the elastic sealing gasket, the air derived from the microdewars can be effectively used to push the elastic sealing gasket to achieve the sealing of the connection of the microdewars body, increasing the accuracy of assisting the test of the microdewars body. When there is no air output after the test of the microdewars body is completed, the elastic sealing gasket also resets, and the limiting plate also separates and loosens the microdewars body, facilitating the replacement operation and further improving the test efficiency of the microdewars;

[0018] Third: The present invention is provided with a spiral pipe and a reinforcement frame. The setting of the spiral pipe makes the output air path longer and more uniform, thereby optimizing the cooling effect on the base and the bimetallic plate, reducing thermal interference and improving system stability. The air inlet pipe is reinforced by the reinforcement frame, improving the safety of the microdewars test. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further explained below with reference to the drawings and embodiments:

[0020] Figure 1 is a three-dimensional schematic diagram of the overall structure of the present invention;

[0021] Figure 2 is a cross-sectional schematic diagram of the overall structure of the present invention;

[0022] Figure 3 is a schematic diagram of the spiral pipe of the present invention;

[0023] Figure 4 is a schematic diagram of the microdewars connection end of the present invention;

[0024] Figure 5 It is a schematic diagram of the bimetallic plate of the present invention;

[0025] Figure 6 It is a schematic diagram of the arc tube of the present invention;

[0026] Figure 7 It is an exploded schematic diagram of the connection structure of the annular frame of the present invention;

[0027] Figure 8 It is a schematic diagram of the annular tube of the present invention;

[0028] Figure 9 It is a top view of the cross-section of the outer plate structure of the present invention.

[0029] Explanation of reference numerals:

[0030] 1. Base; 2. Liquid nitrogen injection pipe; 3. Collection box; 4. Outlet pipe; 5. Inlet pipe; 6. Arc tube; 7. Outer plate; 8. L-shaped pipe; 9. Liquid nitrogen introduction pipe; 10. Limit plate; 11. Microdewars connection end; 12. Annular frame; 13. Installation groove; 14. Spiral tube; 15. Support; 16. Drain pipe; 17. Fixed tube; 18. Rotating shaft; 19. Telescopic plate; 20. Bimetallic plate; 21. Clamping groove; 22. Insertion hole; 23. Annular tube; 24. Air outlet hole; 25. Exhaust hole; 26. Elastic gasket; 27. U-shaped frame; 28. Reinforcement frame; 29. Circular groove. Detailed implementation manners

[0031] The present invention will be described in detail below. The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] The present invention provides a device for improving the test efficiency of microdewars by improvement. The technical solution of the present invention is as follows:

[0033] As Figures 1-9 shown, a device for improving the test efficiency of microdewars includes a base 1. A liquid nitrogen injection pipe 2 is provided on the outer wall of the top end of the base 1. An installation groove 13 is opened on the outer wall of one side of the base 1. A liquid nitrogen introduction pipe 9 is fixedly connected to the inner wall of the installation groove 13. The liquid nitrogen injection pipe 2 and the liquid nitrogen introduction pipe 9 are communicated. It further includes;

[0034] A limiting mechanism, which is arranged on the outer wall of the base 1;

[0035] The limiting mechanism includes a micro-dewar connection end 11 fixedly connected to the outer wall of one side of the base 1. Two circular grooves 29 are provided on the outer wall of one side of the base 1. A spiral tube 14 is fixedly connected to the inner wall of the circular groove 29. An intake pipe 5 is fixedly connected to the outer wall of one side of the spiral tube 14. An exhaust pipe 16 is fixedly connected to the outer wall of the other side of the spiral tube 14. Air exhaust holes are provided on the inner walls of both sides of the installation groove 13. The exhaust pipe 16 is fixedly connected to the inner wall of the air exhaust hole. A support 15 is fixedly connected to the inner wall of one side of the circular groove 29. A bimetallic plate 20 is fixedly connected to the outer wall of the support 15. A telescopic plate 19 is fixedly connected to the outer wall of one side of the bimetallic plate 20. Two slide rails are provided on the outer wall of one side of the base 1. A limiting plate 10 is slidably connected to the inner walls of the two slide rails. A U-shaped frame 27 is fixedly connected to the outer wall of the limiting plate 10. A rotating shaft 18 is rotatably provided in the inner wall of the U-shaped frame 27. One end of the piston rod of the telescopic plate 19 is fixedly connected to the outer wall of the rotating shaft 18. A clamping groove 21 is provided on the outer wall of one side of the limiting plate 10. Limiting holes are provided on the outer walls of both sides of the micro-dewar connection end 11. The limiting plate 10 is adapted to the size of the limiting holes.

[0036] Further, the micro-dewar connection end 11 and the limiting plate 10 are adapted to the size of the micro-dewar body. The bimetallic plate 20 is located inside the spiral tube 14. A one-way valve is installed in the inner wall of the intake pipe 5. The liquid nitrogen injection pipe 2 is tapered. Reinforcing frames 28 are fixedly connected to the outer walls of both sides of the top of the base 1. The reinforcing frames 28 are fixedly connected to the outer wall of the intake pipe 5. A collection box 3 is fixedly connected to the outer wall of one side of the top of the base 1. An exhaust pipe 4 is provided on the outer wall of one side of the collection box 3.

[0037] Further, connection holes are provided on the outer walls of both sides of the collection box 3. The intake pipe 5 is fixedly connected to the inner wall of the connection hole. An annular frame 12 is fixedly connected to the outer wall of the micro-dewar connection end 11. An arc-shaped pipe 6 is fixedly connected to the outer wall of the top of the annular frame 12. The exhaust pipe 4 is fixedly connected to the outer wall of the top of the arc-shaped pipe 6. L-shaped pipes 8 are fixedly connected to the outer walls of both sides of the bottom end of the arc-shaped pipe 6. A fixed pipe 17 is fixedly connected to the inner wall of one side of the L-shaped pipe 8. An annular pipe 23 is slidably connected to the inner wall of the annular frame 12. An outer plate 7 is fixedly connected to the outer wall of one side of the annular pipe 23.

[0038] Furthermore, the size of the outer plate 7 is adapted to the connection end 11 of the micro-dewar, the size of the annular tube 23 is adapted to the annular frame 12, an elastic gasket 26 is fixedly connected to the outer wall of one side of the outer plate 7, and the size of the elastic gasket 26 is adapted to the micro-dewar body. Two jacks 22 are provided on the outer walls of one side of the outer plate 7 and the annular tube 23. The fixed tube 17 is slidably connected to the inner wall of the jack 22. An air outlet 24 is provided on the outer wall of the annular tube 23, and an exhaust hole 25 is provided on the outer wall of the annular frame 12. The size of the air outlet 24 is adapted to the exhaust hole 25. The limiting plates 10 are located on both sides of the connection end 11 of the micro-dewar. The L-shaped tubes 8 are located on both sides of the outer plate 7. Positioning holes are provided at the four corners of the bottom outer wall of the base 1. The size of the liquid nitrogen inlet tube 9 is adapted to the micro-dewar body. The elastic gasket 26 provided on the outer plate 7 is close to the connection end 11 of the micro-dewar. The elastic gasket 26 is compressed to seal the connection between the connection end 11 of the micro-dewar and the micro-dewar body. At this time, the air outlet 24 on the annular tube 23 is aligned with the exhaust hole 25 on the annular frame 12, and the excess air is output through the air outlet 24 and the exhaust hole 25. The continuously output air causes the elastic gasket 26 to be continuously compressed for sealing. When there is no more air output after the micro-dewar body test is completed, the elastic gasket 26 also resets.

[0039] Working principle: When performing the performance test of the micro-dewar body, the micro-dewar core tube to be tested is sleeved into the micro-dewar connection end 11 of the base 1. Then, liquid nitrogen is injected through the liquid nitrogen injection tube 2. The liquid nitrogen enters the micro-dewar body through the liquid nitrogen injection tube 2 and the liquid nitrogen introduction tube 9, and the micro-dewar body is cooled down. The installation groove 13 of the base 1 is adapted to the size of the micro-dewar core tube, and there is a certain distance between the liquid nitrogen introduction tube 9 and the inner wall of the installation groove 13. The air output after the liquid nitrogen is introduced enters the exhaust pipe 16 through the exhaust holes of the installation groove 13. The air enters the spiral tube 14 through the exhaust pipe 16 and cools the base 1 evenly as it outputs along the spiral path. At the same time, it also cools the bimetallic plate 20 connected to the inner support 15. The bimetallic plate 20 bends to drive the two limit plates 10 to slide. The two limit plates 10 slide on both sides of the micro-dewar connection end 11 and insert into the limit holes of the micro-dewar connection end 11 to clamp and limit the micro-dewar, ensuring the stability of the structure. When the limit plate 10 slides, the rotating shaft 18 rotates accordingly to adjust the angle, and the telescopic plate 19 automatically expands and contracts adaptively. There is a certain distance between the bimetallic plate 20 and the spiral tube 14 to ensure that the bimetallic plate 20 can bend freely without being blocked by the spiral tube 14. By guiding the discharged cold air, the cold air cools the bimetallic plate 20 and the base 1 evenly when flowing through the spiral tube 14. The bimetallic plate 20 drives the limit plate 10 to slide and cooperate with the rubber pad in the clamping groove 21 to clamp the micro-dewar to ensure the stability of the test process. Moreover, the initial output air has a stronger cooling effect, the bending force of the bimetallic plate 20 is greater, providing a stronger initial supporting force to ensure the structural stability of the micro-dewar in the initial stage. As the test progresses, the temperature inside the micro-dewar gradually stabilizes, and the temperature of the output air also rises, reducing the clamping force of the limit plate 10, reducing the continuous mechanical stress, and reducing the risk of material fatigue damage. By slowly relaxing the clamping structure, the micro-dewar can better adapt to temperature changes, avoiding stress concentration or deformation caused by temperature changes. The uniform cooling of the base 1 can prevent local overheating or uneven temperature, ensuring the stability of the test environment. The introduced liquid nitrogen cools the micro-dewar, and when the temperature of the dewar drops to the liquid nitrogen temperature, the test can be directly carried out to avoid test data deviation caused by the reason that temperature changes the optical path.

[0040] The spiral tube 14 is made of low-temperature and corrosion-resistant stainless steel. The elastic gasket 26 is made of silicone rubber with good elasticity at low temperature. The annular tube 23 and the outer plate 7 are made of lightweight and low-temperature-resistant aluminum alloy. The output air is collected by the collection box 3 through the intake pipe 5. The one-way valve arranged in the intake pipe 5 prevents air from flowing back. The air then enters the arc-shaped tube 6 through the outlet pipe 4, and finally enters the annular tube 23 through the L-shaped tube 8 and the fixed tube 17. The air quickly fills the annular tube 23 and pushes the outer plate 7 and the annular tube 23, causing the outer plate 7 and the annular tube 23 to slide close to the micro-Dewar connection end 11 on the inner wall of the annular frame 12 and the outer wall of the fixed tube 17. The elastic gasket 26 arranged on the outer plate 7 approaches the micro-Dewar connection end 11, and the elastic gasket 26 is compressed to seal the connection between the micro-Dewar connection end 11 and the micro-Dewar body. At this time, the air outlet hole 24 on the annular tube 23 is aligned with the exhaust hole 25 on the annular frame 12, and the excess air is output through the air outlet hole 24 and the exhaust hole 25. The continuously output air causes the elastic gasket 26 to be continuously compressed for sealing. When there is no air output after the micro-Dewar body test is completed, the elastic gasket 26 also resets, and the bimetallic plate 20 also returns to the horizontal state. The limit plate 10 and the elastic gasket 26 release the micro-Dewar body, and it can be easily removed and replaced. The reinforcement frame 28 arranged on the base 1 supports and reinforces the intake pipe 5, further improving the structural stability.

[0041] The technical means disclosed in the solution of the present invention are not limited to the technical means disclosed above, but also include the technical solutions composed of equivalent replacements of the above technical features. Matters not covered in the present invention belong to the common general knowledge of those skilled in the art.

Claims

1. An apparatus for improving the test efficiency of a micro-dewar, comprising a base (1), wherein a liquid nitrogen injection pipe (2) is arranged on the outer wall of the top end of the base (1), an installation groove (13) is formed in the outer wall of one side of the base (1), a liquid nitrogen introduction pipe (9) is fixedly connected to the inner wall of the installation groove (13), and the liquid nitrogen injection pipe (2) is communicated with the liquid nitrogen introduction pipe (9), and is characterized in that: Further included are; a limiting mechanism, which is arranged on the outer wall of the base (1); The limiting mechanism includes a micro-dewar connection end (11) fixedly connected to the outer wall of one side of the base (1). Two circular grooves (29) are formed on the outer wall of one side of the base (1). A spiral tube (14) is fixedly connected to the inner wall of the circular groove (29). An air inlet pipe (5) is fixedly connected to the outer wall of one side of the spiral tube (14). An air discharge pipe (16) is fixedly connected to the outer wall of the other side of the spiral tube (14). Air discharge holes are formed on the inner walls of both sides of the installation groove (13). The air discharge pipe (16) is fixedly connected to the inner wall of the air discharge hole. A support (15) is fixedly connected to the inner wall of one side of the circular groove (29). A bimetallic plate (20) is fixedly connected to the outer wall of one side of the support (15). A telescopic plate (19) is fixedly connected to the outer wall of one side of the bimetallic plate (20). Two slide rails are arranged on the outer wall of one side of the base (1). A limiting plate (10) is slidably connected to the inner walls of the two slide rails. A U-shaped frame (27) is fixedly connected to the outer wall of the limiting plate (10). A rotating shaft (18) is rotatably arranged in the inner wall of the U-shaped frame (27). One end of the piston rod of the telescopic plate (19) is fixedly connected to the outer wall of the rotating shaft (18). A clamping groove (21) is formed on the outer wall of one side of the limiting plate (10). Limiting holes are formed on the outer walls of both sides of the micro-dewar connection end (11). The limiting plate (10) is adapted to the size of the limiting holes.

2. The device for improving the testing efficiency of a micro-dewar according to claim 1, wherein: The micro-dewar connection end (11) and the limiting plate (10) are adapted to the size of the micro-dewar body. The bimetallic plate (20) is located inside the spiral tube (14). A one-way valve is installed in the inner wall of the air inlet pipe (5). The liquid nitrogen injection pipe (2) is tapered.

3. The device for improving the test efficiency of a micro-dewar according to claim 1, wherein: Reinforcing frames (28) are fixedly connected to the outer walls of both sides of the top of the base (1). The reinforcing frames (28) are fixedly connected to the outer wall of the air inlet pipe (5). A collection box (3) is fixedly connected to the outer wall of one side of the top of the base (1). An air outlet pipe (4) is arranged on the outer wall of one side of the collection box (3).

4. The device for improving the testing efficiency of a micro-dewar according to claim 3, characterized in that: Connection holes are formed on the outer walls of both sides of the collection box (3). The air inlet pipe (5) is fixedly connected to the inner wall of the connection hole. An annular frame (12) is fixedly connected to the outer wall of the micro-dewar connection end (11). An arc-shaped pipe (6) is fixedly connected to the outer wall of the top of the annular frame (12). The air outlet pipe (4) is fixedly connected to the outer wall of the top of the arc-shaped pipe (6).

5. The device for improving the test efficiency of a micro-dewar according to claim 4, wherein: L-shaped pipes (8) are fixedly connected to the outer walls of both sides of the bottom end of the arc-shaped pipe (6). A fixed pipe (17) is fixedly connected to the inner wall of one side of the L-shaped pipe (8). An annular pipe (23) is slidably connected to the inner wall of the annular frame (12). An outer plate (7) is fixedly connected to the outer wall of one side of the annular pipe (23).

6. The device for improving the test efficiency of a micro-dewar according to claim 5, characterized in that: The outer plate (7) is adapted to the size of the micro-dewar connection end (11). The annular pipe (23) is adapted to the size of the annular frame (12). An elastic sealing pad (26) is fixedly connected to the outer wall of one side of the outer plate (7). The elastic sealing pad (26) is adapted to the size of the micro-dewar body.

7. The device for improving the testing efficiency of a micro-dewar according to claim 6, characterized in that: Two jacks (22) are provided on one outer wall of the outer plate (7) and the annular tube (23). The fixed tube (17) is slidably connected to the inner wall of the jack (22). An air outlet hole (24) is provided on the outer wall of the annular tube (23). An exhaust hole (25) is provided on the outer wall of the annular frame (12). The sizes of the air outlet hole (24) and the exhaust hole (25) are adapted to each other.

8. The device for improving the testing efficiency of a micro-dewar according to claim 5, characterized in that: The limiting plates (10) are located on both sides of the micro-dewar connection end (11). The L-shaped tubes (8) are located on both sides of the outer plate (7). Positioning holes are provided at the four corners of the bottom outer wall of the base (1). The size of the liquid nitrogen inlet tube (9) is adapted to that of the micro-dewar body.

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