Integrated quantum electricity metering device

Abstract

The invention relates to an integrated quantum electricity metering device. The device comprises a vacuum heat insulation structure; the primary cold shield is hoisted in the vacuum heat insulation structure; the electromagnetic shielding structure is fixedly mounted in the primary cold shield; the quantum voltage module is fixedly mounted in the zero magnetic environment provided by the electromagnetic shielding structure; the superconducting coil magnet structure is fixedly mounted in the primary cold shield; the Hall resistor module is fixedly mounted in the magnetic field provided by the superconducting magnet module; and the cold conduction structure is fixedly connected with the primary cold screen. According to the invention, the quantum voltage module and the Hall resistor module are jointly placed in a vacuum, adiabatic and low-temperature environment, and shielding measures are specifically taken, so that a device capable of simultaneously realizing storage, reproduction and transmission of a quantum voltage reference and a quantum resistor reference is established.

Description

Technical Field

[0001] The invention relates to the technical field of metering device design, and in particular to the design of an integrated quantum electrical metering device. Background Art

[0002] The carrier device of the basic unit directly affects the accuracy of the preservation, reproduction and transmission of the basic unit. Since the quantum metrology standard is not affected by the external environment, it has high precision, high stability and good reproducibility. In the field of electrical metrology, the quantum voltage standard and quantum resistance standard based on the Josephson effect and quantum Hall effect have replaced the traditional physical standard.

[0003] The above two electrical standards can independently perform corresponding value transfer work, and under specific metrological conditions, they can also be combined into a more complex system. The premise for the normal operation of the two electrical standards is that both require a carrier device to provide a low-temperature environment for its core components, so they can share the same low-temperature chamber, which provides a basis for the merger of the carrier devices of the two electrical standards. However, the Josephson effect is easily affected by the magnetic field, so the quantum voltage standard needs to be in a zero magnetic field environment to work properly, while the quantum resistance standard can only be realized in a strong magnetic environment.

[0004] In view of the above problems, the prior art has not yet proposed to merge the quantum voltage reference and the quantum resistance reference, and further, there is no combined carrier device. Summary of the invention

[0005] In order to overcome the above technical problems, the present application provides an integrated quantum electrical metrology device, which constructs a low-temperature chamber without a low-temperature medium, and simultaneously accommodates a zero magnetic field space and a strong magnetic field space in the low-temperature chamber.

[0006] The present invention adopts the following technical solution:

[0007] An integrated quantum electrical metrology device, comprising:

[0008] Vacuum insulation structure;

[0009] A primary cold shield is arranged inside the vacuum insulation structure and is fixedly connected to the vacuum insulation structure;

[0010] An electromagnetic shielding structure, fixedly disposed in the first-level cold shield;

[0011] A quantum voltage module, wherein the quantum voltage module is fixed in the electromagnetic shielding structure;

[0012] A superconducting coil magnet structure is fixedly disposed in the first-stage cold shield;

[0013] A Hall resistance module, which is disposed in the primary cold shield and fixedly connected to the superconducting coil magnet structure; and

[0014] A cold conduction structure is fixedly installed on the vacuum insulation structure in a through-type manner, wherein a portion of the cold conduction structure extending into the vacuum insulation structure is fixedly connected to the electromagnetic shielding structure, the quantum voltage module, and the superconducting coil magnet structure.

[0015] The present invention proposes an integrated quantum electrical measurement device, which satisfies the requirement of providing a zero magnetic field space for a quantum voltage reference and a strong magnetic field space for a quantum resistance reference in the same cryogenic chamber without cryogenic medium (cryogenic medium, i.e., no need for cryogenic medium such as liquid nitrogen for cooling), and only adopts conduction cooling to cool down. Finally, the carrier device of the quantum voltage reference and the quantum resistance reference is merged.

[0016] The present invention has the following beneficial effects:

[0017] The present invention arranges a cold shield tube to construct a single low-temperature chamber, and simultaneously arranges a shielding tube group and a superconducting coil inside the cold shield tube, thereby achieving simultaneous arrangement of a zero magnetic field space and a strong magnetic field space in the same low-temperature chamber, providing a device platform for the combination of a quantum voltage reference and a quantum resistance reference. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an overall schematic diagram of an embodiment of an integrated quantum electrical measurement device of the present invention;

[0019] Figure 2 for Figure 1 A cross-sectional schematic diagram, wherein 100-vacuum insulation structure, 110-primary cold shield, 120-electromagnetic shielding structure, 130-quantum voltage module, 140-superconducting coil magnet structure, 150-Hall resistance module, 160-cold conduction structure;

[0020] Figure 3 It is a schematic diagram of an exploded structure of a vacuum insulation structure 100, wherein 101-Dewar sealing cylinder, 102-Dewar sealing cover, 103-sealing gasket, 104-long tie rod, 105-external interface, 161-refrigeration machine;

[0021] Figure 4 A schematic diagram of the decomposed structure of a first-level cold shield, wherein 111 is a cold shield end cover, and 112 is a cold shield tube;

[0022] Figure 5It is a cross-sectional schematic diagram of an electromagnetic shielding structure, wherein 121 is a lifting block, 122 is an outer shielding tube, 123 is a middle shielding tube, 124 is an inner shielding tube, 125 is a superconducting shielding tube, 126 is a common connecting piece, and 127 is a pull rod;

[0023] Figure 6 A schematic diagram of a connection structure of a quantum voltage module, wherein 125-superconducting shielding tube, 131-voltage chip, 132-chip cold plate, 133-short suspension rod, 163-cooling block;

[0024] Figure 7 A schematic diagram of a connection structure of a superconducting coil magnet structure, wherein 141 is a skeleton, 142 is a superconducting coil, 143 is a hanging flange, 150 is a Hall resistance module, and 163 is a cooling block;

[0025] Figure 8 A schematic diagram of a connection structure of a Hall resistor module, wherein 151 is a sample stage, 152 is a mounting plate, and 153 is a Hall resistor;

[0026] Fig. 9 It is a schematic diagram of a connection structure of a cold conduction structure, wherein 102-Dewar sealing cover, 111-cold screen end cover, 132-chip cold plate, 133-short suspension rod, 141-skeleton, 161-refrigeration machine, 162-cold conduction belt, 163-cold conduction block, 1611-mounting flange; 1612-first-stage cold head; 1613-second-stage cold head. DETAILED DESCRIPTION

[0027] In order to enable the reader to better understand the design purpose of the present method, the following specific embodiments are provided so that the reader can vividly understand the structure, structural composition, working principle and technical effect involved in the present method. However, it should be noted that the following embodiments are not limitations on the technical solution of the present method. While analyzing and understanding the various embodiments, those skilled in the art can combine existing knowledge to make a series of deformations and equivalent substitutions to the technical solution provided by the present method, and the new technical solution obtained by the deformation and equivalent substitution is also included in the present method. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] like Figure 1-9As shown, an integrated quantum electrical measurement device is used to simplify voltage and resistance measurement equipment and facilitate the transmission of measurement values. The integrated quantum electrical measurement device includes: a vacuum insulation structure 100, a primary cold shield 110, an electromagnetic shielding structure 120, a quantum voltage module 130, a superconducting coil magnet structure 140, a Hall resistance module 150 and a cold conduction structure 160. The cold shield end cover 111 of the primary cold shield 110 is suspended under the Dewar sealing cover 102 of the vacuum insulation structure 100 by a long tie rod 104 with bolts at both ends. The electromagnetic shielding structure 120 and the superconducting coil magnet structure 140 are both fastened under the cold shield end cover 111 by bolts. The quantum voltage module 130 is suspended in the superconducting shielding tube of the electromagnetic shielding structure 120 by a short suspension rod 133 with bolts at both ends. The Hall resistance module 150 and the superconducting coil magnet are connected to each other. The skeleton 141 of the structure 140 is connected by threaded fastening, and the cold conduction structure 160 is fastened to the Dewar sealing cover 102 by bolts through the mounting flange 1611 of the refrigerator 161, and the first-level cold head 1612 of the refrigerator 161 is fastened to the cold screen end cover 111 by bolts, and the second-level cold head 1613 extends into the first-level cold screen 110. In actual use, the size of the vacuum insulation structure and the internal installation arrangement can be set according to the use requirements, and will not be described one by one in this embodiment.

[0029] like Figure 3 As shown, the vacuum insulation structure 100 includes a Dewar sealing cylinder 101, a Dewar sealing cover 102, a sealing gasket 103, a long pull rod 104, and a primary external interface 105. The Dewar sealing cylinder 101 and the Dewar sealing cover 102 are fastened with bolts, and the sealing gasket 103 is embedded in the connecting surface for sealing. The primary external interface 105 welded on the Dewar sealing cover 102 can be used as an exhaust port, and the interior of the vacuum insulation structure 100 is vacuumized by exhausting the gas. In addition, the primary external interface 105 can also be connected to transmit signals, which is used to introduce external signal leads into the quantum voltage module 130 and the Hall resistance module 150.

[0030] like Figure 4 As shown, the first-level cold shield 110 includes a cold shield end cover 111 and a cold shield tube 112, and the cold shield end cover 111 and the cold shield tube 112 are fastened together by bolts. The first-level cold head 1612 of the refrigerator 161 is fastened together with the cold shield end cover 111 by bolts. Under the refrigeration effect of the first-level cold head 1612, the first-level cold shield 110 constructs a low-temperature space required for the work of the quantum voltage module 130, the Hall resistance module 150 and the superconducting coil magnet structure 140. In addition, the first-level cold shield 110 provides a support point for the fixed installation of the electromagnetic shielding structure 120 and the superconducting coil magnet structure 140.

[0031] like Figure 5-6 As shown, the electromagnetic shielding structure 120 includes a hoisting block 121, an outer shielding tube 122, a middle shielding tube 123, an inner shielding tube 124, a superconducting shielding tube 125, a common connector 126 and a pull rod 127; the quantum voltage module 130 includes a voltage chip 131, a chip cold plate 132 and a short suspension rod 133; the electromagnetic shielding structure 120 is connected to the cold shield end cover 111 by means of a hoisting block 121, and the outer shielding tube 122, the middle shielding tube 123 and the inner shielding tube 124 are nested layer by layer, and adopt a It is fastened and installed on the common connection piece 126 by threaded connection, and the common connection piece 126 is fixedly connected with the lifting block 121 by threads, and the innermost superconducting shielding tube 125 is hoisted on the inner shielding tube 124 by a pull rod 127; the quantum voltage module 130 is hoisted in the superconducting shielding tube 125 by a short suspension rod 133 with bolts at both ends, and the voltage chip 131 is fastened on the chip cold plate 132 by threads, and the upper end bolt of the short suspension rod 133 is fastened on the superconducting shielding tube 125, and the chip cold plate 132 is fixed on the lower end bolt. In this embodiment, the electromagnetic shielding structure 120 constructs a zero magnetic field space for the quantum voltage module 130 through a nested shielding tube made of 3 layers of high magnetic permeability materials and 1 layer of superconducting material, which can shield the earth's magnetic field and the strong magnetic field generated by the superconducting coil magnet structure 140; this structure can be replaced by other structures that can achieve magnetic shielding according to actual application requirements.

[0032] like Figure 7-8 As shown, the superconducting coil magnet structure 140 includes a skeleton 141, a superconducting coil 142 and a hanging flange 143; the Hall resistor module 150 includes a sample table 151, a mounting plate 152 and a Hall resistor 153, the Hall resistor 153 is fixedly mounted on the sample table 151, the sample table 151 is fixedly mounted on the mounting plate 152, and the mounting plate 152 is fixedly connected to the skeleton 141 of the superconducting coil magnet structure 140; the superconducting coil magnet structure 140 is connected to the superconducting coil magnet structure 140 by a plurality of means. Through the lifting flange 143, it is fixedly installed under the cold screen end cover 111 by bolt fastening. The skeleton 141 is fastened with bolts and the lifting flange. The superconducting coil 142 is tightly wound on the skeleton 141. The skeleton 141 is provided with a magnetic hole. The sample stage 151 of the Hall resistance module 150 can be inserted into the magnetic hole, and the devices on the sample stage 151 are placed in the preset strong magnetic field of the superconducting coil magnet structure 140. The Hall resistance module 150 is fixedly installed on the skeleton 141 through a mounting plate.

[0033] like Fig. 9As shown, the cold conduction structure 160 includes a refrigerator 161, a cold conduction belt 162 and a cold conduction block 163. The refrigerator 161 includes a mounting flange 1611, a primary cold head 1612 and a secondary cold head 1613. The refrigerator 161 uses the mounting flange 1611 and the primary cold head 1612 as fixed mounting points to determine the positioning of the refrigerator 161 in the overall device. Three cold conduction belts 162 are fastened to the secondary cold head 1613 by threads. The other end of each cold conduction belt 162 is welded with a cold conduction block 163. When the device is in working state, the superconducting shielding tube 125, the quantum voltage module 130, and the superconducting coil Both the magnet structure 140 and the Hall resistor module 150 need to be in a low-temperature environment. Therefore, the three cooling blocks 163 led out from the secondary cold head 1613 through the cooling belt 162 are respectively connected to the superconducting shielding tube 125, the chip cold plate 132 of the quantum voltage module 130 and the skeleton 141 of the superconducting coil magnet structure 140 by means of threaded fastening. Among them, the Hall resistor module 150 is fastened to the skeleton 141 through the mounting plate 152. Therefore, the superconducting coil magnet structure 140 and the Hall resistor module 150 share a cooling block 163, which can be replaced by other cold conduction cooling structures in actual use.

[0034] When in use, firstly, the air inside the vacuum insulation structure 100 is extracted through the first-level external interface 105 to form a vacuum environment in the device, and the refrigerator 161 is started in the vacuum environment. The first-level cold shield 110 is cooled to 30K through the first-level cold head 1612, and the superconducting shielding tube 125, the quantum voltage module 130, the superconducting coil magnet structure 140 and the Hall resistance module 150 are cooled to a low temperature of 4K by the second-level cold head 1613. In the low-temperature environment, the superconducting coil 142 of the superconducting coil magnet structure 140 is excited to form a target magnetic field, and a driving signal is input to the quantum voltage module 130 and the Hall resistance module 150. The voltage signal output by the quantum voltage module 130 and the Hall resistance module 150 can be used as a signal for storing, reproducing and transmitting the basic unit.

[0035] In summary, the technical effects of the present invention are:

[0036] The electromagnetic shielding structure 120 is used to provide electromagnetic shielding protection for the quantum voltage module 130 in a low-temperature environment, and the superconducting coil magnet structure 140 is used to provide the magnetic field required for the Hall resistance module 150 to work, and the vacuum insulation structure 100 and the cold conduction structure 160 are designed to provide a vacuum, insulation, and low-temperature environment for the above two structures. The present invention places the quantum voltage module and the Hall resistance module together in a vacuum, insulation, and low-temperature environment, and takes targeted shielding measures to establish a device that can simultaneously realize the preservation, reproduction, and transmission of the quantum voltage reference and the quantum resistance reference.

[0037] Since the present method cannot enumerate all embodiments, some preferred technical features and preferred technical solutions can be reasonably replaced or combined with each other, and the new technical solutions obtained thereby are also included in the present method.

[0038] It should be understood that for those of ordinary skill in the art, improvements or changes can be made based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to the present invention. The drawings corresponding to the specific implementation scheme exist in the form of auxiliary understanding, which can facilitate readers to fully understand the abstract higher-level concepts of the technical concepts involved in the present method through the immediate concrete and vivid lower-level concepts. In the overall understanding of the present method and the comparison with other technical solutions other than the technical solutions provided by the present method, the appearance of the drawings should not be used as the only reference basis. After understanding the concept of the present method, a series of deformations, equivalent substitutions, combinations of characteristic elements, deletion and reorganization of non-essential technical characteristic element values, and reasonable addition and reorganization of non-essential technical characteristic elements commonly used in the prior art, etc., made in accordance with or without the drawings, should be understood as being included in the spirit of the present method.

Claims

1. An integrated quantum electrical measurement device, characterized in that: include: Vacuum insulation structure (100); A primary cold shield (110), arranged inside the vacuum insulation structure (100) and fixedly connected to the vacuum insulation structure (100); An electromagnetic shielding structure (120) fixedly disposed in the primary cold shield (110); A quantum voltage module (130), wherein the quantum voltage module (130) is fixed in the electromagnetic shielding structure (120); A superconducting coil magnet structure (140) is fixedly disposed in the primary cold shield (110); a Hall resistance module (150), the Hall resistance module being arranged in the primary cold shield (110) and fixedly connected to the superconducting coil magnet structure (140); and, A cold conduction structure (160), the cold conduction structure (160) being fixedly mounted on the vacuum insulation structure (100) in a penetrating manner, wherein a portion of the cold conduction structure (160) extending into the vacuum insulation structure (100) is fixedly connected to the electromagnetic shielding structure (120), the quantum voltage module (130), and the superconducting coil magnet structure (140).

2. The integrated quantum electrical measurement device according to claim 1, characterized in that: The vacuum insulation structure (100) comprises a sealing cylinder, a long pull rod (104) and an external interface (105); the external interface (105) is welded to the sealing cylinder, and the long pull rod (104) is suspended in the sealing cylinder.

3. The integrated quantum electrical measurement device according to claim 2, characterized in that: The first-level cold shield (110) comprises a cold shield end cover (111) and a cold shield tube (112), wherein the cold shield end cover (111) is fixedly mounted on the cold shield tube (112), and the cold shield end cover (111) of the first-level cold shield (110) is fixedly connected to the long pull rod (104).

4. The integrated quantum electrical metrology device according to claim 3, characterized in that: The electromagnetic shielding structure (120) is placed in the cold shield tube (112) and is hoisted under the cold shield end cover (111); the superconducting coil magnet structure (140) is placed in the cold shield tube (112) and is hoisted under the cold shield end cover (111).

5. An integrated quantum electrical metrology device according to claim 3 or 4, characterized in that: The electromagnetic shielding structure (120) comprises a hanging block (121) and a shielding cylinder group, and the shielding cylinder group is fixedly connected to the hanging block (121).

6. The integrated quantum electrical measurement device according to claim 5, characterized in that: The quantum voltage module (130) is suspended in the shielding cylinder group.

7. An integrated quantum electrical metrology device according to claim 5 or 6, characterized in that: The sealing cylinder comprises a Dewar sealing cylinder (101), a Dewar sealing cover (102), and a sealing gasket (103); the Dewar sealing cover (102) is fixedly mounted on the Dewar sealing cylinder (101), and the sealing gasket (103) is embedded between the Dewar sealing cover (102) and the Dewar sealing cylinder (101).

8. The integrated quantum electrical metrology device according to claim 7, characterized in that: The shielding tube group comprises an outer shielding tube (122), a middle shielding tube (123), an inner shielding tube (124), a superconducting shielding tube (125), a common connecting piece (126) and a pull rod (127); the outer shielding tube (122), the middle shielding tube (123) and the inner shielding tube (124) are nested layer by layer and fixedly connected to the common connecting piece (126); the common connecting piece (126) is suspended under the lifting block (121); the superconducting shielding tube (125) is fixedly lifted in the inner shielding tube (124) by the pull rod (127).

9. The integrated quantum electrical metrology device according to claim 8, characterized in that: The quantum voltage module (130) comprises a voltage chip (131), a chip cold plate (132) and a short suspension rod (133); the voltage chip (131) is fixedly mounted on the chip cold plate (132), and the chip cold plate (132) is fixedly suspended in the superconducting shielding tube (125) via the short suspension rod (133).

10. The integrated quantum electrical metrology device according to claim 9, characterized in that: The superconducting coil magnet structure (140) comprises a frame (141), a superconducting coil (142) and a hanging flange (143); the frame (141) is fixedly mounted to the cold shield end cover (111) via the hanging flange (143); and the superconducting coil (142) is wound on the frame (141).

11. The integrated quantum electrical metrology device according to claim 10, characterized in that: The cold conduction structure (160) comprises: a refrigerator (161), a plurality of cold conduction belts (162) and a plurality of cold conduction blocks (163); the cold conduction belts (162) are fixedly mounted on the refrigerator (161); the cold conduction blocks (163) are respectively welded to the plurality of cold conduction belts (162); the superconducting shielding tube (125) of the shielding tube group, the chip cold plate (132) of the quantum voltage module (130), and the skeleton (141) of the superconducting coil magnet structure (140) are respectively fixedly connected to one of the cold conduction blocks (163); and the superconducting shielding tube (125), the chip cold plate (132) and the skeleton (141) are not in contact with each other.

12. The integrated quantum electrical metrology device according to claim 11, characterized in that: The refrigerator (161) comprises a mounting flange (1611), a primary cold head (1612) and a secondary cold head (1613); the mounting flange (1611) is fixedly connected to the Dewar sealing cover (102), the primary cold head (1612) is fixedly connected to the cold shield end cover (111), and the secondary cold head (1613) is fixedly connected to the cooling belt (162).

13. An integrated quantum electrical metrology device according to claim 10, 11 or 12, characterized in that: The Hall resistor module (150) comprises a sample stage (151), a mounting plate (152) and a Hall resistor (153); the Hall resistor (153) is fixedly mounted on the sample stage (151); the sample stage (151) is fixedly mounted on the mounting plate (152); and the mounting plate (152) is fixedly connected to a frame (141) of the superconducting coil magnet structure (140).

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