Electromagnetic shielding device for atomic gas chamber in quantum measurement system

Abstract

The invention discloses an electromagnetic shielding device for an atomic gas chamber in a quantum measurement system, the electromagnetic shielding device comprises a first shielding layer, a second shielding layer and a third shielding layer which are sequentially arranged from inside to outside, the atomic gas chamber is arranged in the first shielding layer, an electrode plate is arranged in the atomic gas chamber, an optical fiber is connected to the electrode plate, and the optical fiber is connected to the second shielding layer. The end, away from the electrode plate, of the optical fiber penetrates and extends to the outside of the third shielding layer, a cut-off waveguide tube is arranged outside the third shielding layer, and an electric wire is arranged on the cut-off waveguide tube. The electromagnetic shielding device is reliable in structure and good in shielding performance, the electromagnetic shielding effectiveness is effectively improved by applying the circular cut-off waveguide tube, and the purpose of shielding multi-band electromagnetic interference is achieved by adopting three shielding layers on the basis of the circular cut-off waveguide tube.

Description

Technical Field

[0001] The invention relates to the technical field of electromagnetic shielding, and in particular to an electromagnetic shielding device for an atomic gas chamber in a quantum measurement system. Background Art

[0002] my country has developed rapidly in the field of science and technology, and various types of electronic and electrical equipment have penetrated into every field of our lives. The electromagnetic energy generated by these products during operation will cause electromagnetic interference to themselves and other equipment if no measures are taken. Therefore, sensitive equipment must be fully protected. Therefore, electromagnetic shielding is a very intuitive and effective way to prevent electromagnetic interference from external electromagnetic radiation. Electromagnetic shielding technology refers to the use of a shielding body (a material with specific properties) to prevent or lose the transmission of electromagnetic disturbance energy. It is one of the important means to suppress electromagnetic interference.

[0003] Quantum measurement mainly uses the method of introducing the external voltage to be measured into the electrode plate in the atomic gas chamber through an electrical conductor. However, the electric field to be measured will be interfered by other electromagnetic fields, thus affecting the precision and accuracy of the measurement.

[0004] At present, there is a lack of research on electromagnetic shielding solutions for quantum measurements, especially for the atomic gas chamber, and the current mainstream electromagnetic shielding solution still uses a single-layer shielding, so it cannot effectively shield both low-frequency and high-frequency electromagnetic interference at the same time. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides an electromagnetic shielding device for an atomic gas chamber in a quantum measurement system.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: an electromagnetic shielding device for an atomic gas chamber in a quantum measurement system, comprising a first shielding layer, a second shielding layer and a third shielding layer arranged in sequence from the inside to the outside, an atomic gas chamber is arranged inside the first shielding layer, an electrode plate is arranged inside the atomic gas chamber, an optical fiber is connected to the electrode plate, and the end of the optical fiber away from the electrode plate extends through the outside of the third shielding layer, a cutoff waveguide is arranged outside the third shielding layer, and an electrical conductor is arranged on the cutoff waveguide.

[0007] Furthermore, the cutoff waveguide tubes are respectively located at the upper end and the lower end of the third shielding layer.

[0008] Furthermore, the cutoff waveguide tube is a metal tubular structure.

[0009] Furthermore, the first shielding layer, the second shielding layer and the third shielding layer are all cube structures, and are sequentially covered from the inside to the outside.

[0010] Furthermore, the first shielding layer is made of copper material.

[0011] Furthermore, the second shielding layer is made of iron material.

[0012] Furthermore, the third shielding layer is made of aluminum material.

[0013] The present invention has the following beneficial effects: the electromagnetic shielding device provided by the present invention for an atomic gas chamber in a quantum measurement system has a reliable structure and good shielding performance. The circular cutoff waveguide tube is used to effectively improve the electromagnetic shielding effectiveness. Moreover, on the basis of the circular cutoff waveguide tube, a three-layer shielding layer is used to achieve the purpose of shielding multi-band electromagnetic interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the external structure of the present invention;

[0015] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0016] Figure 1 to Figure 2 The reference numerals shown in the figure represent respectively: 1-first shielding layer, 2-second shielding layer, 3-third shielding layer, 4-atomic gas chamber, 5-electrode plate, 6-optical fiber, 7-cutoff waveguide tube, 8-electrical conductor. DETAILED DESCRIPTION

[0017] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0018] like Figure 1 to Figure 2 As shown, an electromagnetic shielding device for an atomic gas chamber in a quantum measurement system comprises a first shielding layer 1, a second shielding layer 2 and a third shielding layer 3 which are sequentially arranged from the inside to the outside, an atomic gas chamber 4 is arranged inside the first shielding layer 1, an electrode plate 5 is arranged inside the atomic gas chamber 4, an optical fiber 6 is connected to the electrode plate 5, and the end of the optical fiber 6 away from the electrode plate 5 extends to the outside of the third shielding layer 3, a cutoff waveguide 7 is arranged outside the third shielding layer 3, and an electric conductor 8 is arranged on the cutoff waveguide 7. The cutoff waveguide 7 is respectively located at the upper and lower ends of the third shielding layer 3, the first shielding layer 1, the second shielding layer 2 and the third shielding layer 3 are all cubic structures, which are sequentially covered from the inside to the outside, wherein the first shielding layer 1 is made of copper material, the second shielding layer 2 is made of iron material, and the third shielding layer 3 is made of aluminum material. The device uses a circular cutoff waveguide 7 to effectively improve the electromagnetic shielding efficiency, and on the basis of the circular cutoff waveguide 7, a three-layer shielding layer is used to achieve the purpose of shielding multi-band electromagnetic interference.

[0019] The cutoff waveguide 7 is a metal tubular structure, and its function is similar to the high-pass filter in the filter. This type of cutoff waveguide 7 can weaken external electromagnetic waves and prohibit external electromagnetic waves below the cutoff frequency of the waveguide from propagating in it. This case makes use of this characteristic of the waveguide and adds a waveguide section at the upper and lower openings of the shielding device to improve the shielding effectiveness. The cutoff frequency f of the cutoff waveguide 7 is c It is only related to the size of the waveguide cross-sectional area and can be expressed as:

[0020]

[0021] Where b is the diameter of the circular waveguide.

[0022] The corresponding electromagnetic shielding effectiveness can be expressed as:

[0023]

[0024] Among them, f is the frequency of the external electromagnetic wave, and H is the height of the circular waveguide.

[0025] Under normal circumstances, f should be less than f c , usually f c =(5~12)f, then the shielding effectiveness is By adopting a circular waveguide, electromagnetic waves with a frequency lower than the cutoff frequency of the waveguide can be shielded to a great extent from entering the atomic gas chamber 4 through the holes, thereby interfering with the electric field to be measured and further improving the electromagnetic shielding effectiveness.

[0026] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An electromagnetic shielding device for an atomic gas chamber in a quantum measurement system, characterized in that: The invention comprises a first shielding layer (1), a second shielding layer (2) and a third shielding layer (3) which are arranged in sequence from the inside to the outside, wherein an atomic gas chamber (4) is arranged inside the first shielding layer (1), an electrode plate (5) is arranged inside the atomic gas chamber (4), an optical fiber (6) is connected to the electrode plate (5), and an end of the optical fiber (6) away from the electrode plate (5) extends through the outside of the third shielding layer (3), a cutoff waveguide tube (7) is arranged outside the third shielding layer (3), and an electric conductor (8) is arranged on the cutoff waveguide tube (7).

2. The electromagnetic shielding device for an atomic gas chamber in a quantum measurement system according to claim 1, characterized in that: The cutoff waveguide tubes (7) are respectively located at the upper end and the lower end of the third shielding layer (3).

3. The electromagnetic shielding device for an atomic gas chamber in a quantum measurement system according to claim 1, characterized in that: The cutoff waveguide tube (7) is a metal tubular structure.

4. The electromagnetic shielding device for an atomic gas chamber in a quantum measurement system according to any one of claims 1 to 3, characterized in that: The first shielding layer (1), the second shielding layer (2) and the third shielding layer (3) are all cubic structures and are sequentially covered from the inside to the outside.

5. The electromagnetic shielding device for an atomic gas chamber in a quantum measurement system according to claim 4, characterized in that: The first shielding layer (1) is made of copper material.

6. The electromagnetic shielding device for an atomic gas chamber in a quantum measurement system according to claim 5, characterized in that: The second shielding layer (2) is made of iron material.

7. The electromagnetic shielding device for an atomic gas chamber in a quantum measurement system according to claim 5, characterized in that: The third shielding layer (3) is made of aluminum material.

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