An anti-interference atomic gas cell with an electromagnetic shielding layer

Abstract

The utility model relates to anti -interference atomic gas chamber technical field especially anti -interference atomic gas chamber with electromagnetic shielding layer, including gas chamber body, the inside sealed alkali metal atom vapor and buffer gas of gas chamber body, its characterized in be provided with at least one layer for shielding outside electromagnetic interference's electromagnetic shielding layer on the outer surface of gas chamber body, be provided with insulating layer between gas chamber body and electromagnetic shielding layer, the outer surface of electromagnetic shielding layer still is provided with a layer of protective layer, is provided with a plurality of optical light window and heating electrode on gas chamber body. The utility model effectively attenuates and blocks outside electromagnetic interference, provides a pure quantum state evolution environment for alkali metal atom, improves the signal-to-noise ratio and measurement accuracy of atomic sensor, avoids the local uneven heat dissipation or thermal eddy current caused by winding or wrapping, ensures the uniformity of thermal field when gas chamber works, guarantees the stability of atomic vapor density and state.

Description

Technical Field

[0001] This utility model relates to the field of anti-interference atomic gas chamber technology, specifically an anti-interference atomic gas chamber with an electromagnetic shielding layer. Background Technology

[0002] Atomic gas cells are core sensing elements in atomic physics, quantum optics, and precision measurement, and are widely used in devices such as atomic clocks, atomic magnetometers, atomic gyroscopes, and quantum sensors. Their working principle is based on the interaction between light of a specific frequency (usually laser light) and alkali metal atomic vapors (such as rubidium and cesium) sealed within the gas cell. Information about the external physical field is obtained by detecting changes in the state of the light or atoms.

[0003] In practical applications, atomic gas chambers need to be in a highly controllable physical environment. However, electromagnetic interference from the external environment (including low-frequency AC magnetic fields, radio frequency signals, etc.) can severely disrupt the quantum states of atoms within the gas chamber, causing shifts in energy level Zeeman splitting, relaxation of atomic spin precession, etc., leading to a decrease in the signal-to-noise ratio of the sensor signal, frequency drift, or degradation of measurement accuracy. To address electromagnetic interference, existing technologies typically employ the following methods: Overall shielding method: The entire sensor system (including atomic gas chamber, optical elements, circuits, etc.) is placed in a large external shielding box. Although this method is effective, it results in large device size, complex structure, high cost, and is not conducive to the miniaturization and integration of sensors.

[0004] Partial shielding of the gas chamber: Copper wire or metal foil is wrapped around the outer wall of the gas chamber. This method has limited and inconsistent shielding effectiveness. The metal layer does not adhere well to the gas chamber body, resulting in gaps and potentially creating additional electromagnetic resonant cavities. More importantly, the gas chamber usually needs to be heated to maintain sufficient atomic vapor density. The wrapped metal layer may affect the uniformity of the thermal field, and the metal material may short-circuit with the heating electrodes on the gas chamber surface, introducing new noise and safety hazards.

[0005] No solutions have yet been proposed to address the related technical issues. Utility Model Content

[0006] To address the problems in related technologies, this invention proposes an anti-interference atomic gas chamber with an electromagnetic shielding layer to overcome the aforementioned technical problems in existing related technologies. The purpose of this invention is to effectively attenuate and block external electromagnetic interference by setting an electromagnetic shielding layer, providing a pure quantum state evolution environment for alkali metal atoms, improving the signal-to-noise ratio and measurement accuracy of atomic sensors, avoiding uneven local heat dissipation or thermal eddies caused by entanglement or wrapping, ensuring the uniformity of the thermal field of the gas chamber during operation, and guaranteeing the stability of atomic vapor density and state.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an anti-interference atomic gas chamber with an electromagnetic shielding layer, comprising a gas chamber body, wherein the interior of the gas chamber body is sealed with alkali metal atomic vapor and a buffer gas, characterized in that at least one electromagnetic shielding layer for shielding external electromagnetic interference is provided on the outer surface of the gas chamber body, an insulating layer is provided between the gas chamber body and the electromagnetic shielding layer, a protective layer is also provided on the outer surface of the electromagnetic shielding layer, and a plurality of optical transmission windows and heating electrodes are provided on the gas chamber body.

[0008] Preferably, the electromagnetic shielding layer is a thin metal film formed directly on the outer surface of the gas chamber body by magnetron sputtering, electroplating or chemical plating.

[0009] Preferably, the material of the metal thin film is one or more combinations of copper, silver, gold, nickel, and manganese-zinc ferrite materials.

[0010] Preferably, the electromagnetic shielding layer is an independently formed metal shielding cover, and the air chamber body is embedded inside the metal shielding cover. The metal shielding cover is formed by stamping metal sheet or made of metal wire mesh.

[0011] Preferably, the insulating layer is one of a silicon dioxide film, an aluminum oxide film, or a polyimide film.

[0012] Preferably, the electromagnetic shielding layer is a multi-layer composite structure, comprising at least one high conductivity layer and one high magnetic permeability layer.

[0013] Compared with the prior art, the beneficial effects of this utility model are: This invention relates to an anti-interference atomic gas cell with an electromagnetic shielding layer. By setting an electromagnetic shielding layer on the outside of the gas cell body, a local shielding environment is constructed that is close to the gas cell, which effectively attenuates and blocks external electromagnetic interference, providing a pure quantum state evolution environment for alkali metal atoms, and greatly improving the signal-to-noise ratio and measurement accuracy of the atomic sensor. This utility model is an anti-interference atomic gas chamber with an electromagnetic shielding layer. By setting the electromagnetic shielding layer as a metal thin film or a metal shielding cover, it forms good physical contact or tightly encloses the gas chamber body, avoiding uneven local heat dissipation or thermal eddies caused by entanglement or wrapping, ensuring the uniformity of the thermal field of the gas chamber body during operation, thereby ensuring the stability of atomic vapor density and state. This invention relates to an anti-interference atomic gas chamber with an electromagnetic shielding layer. By setting an insulating layer, the risk of short circuit between the metal shielding layer and the heating electrode on the surface of the gas chamber body is fundamentally eliminated, thereby eliminating the electrical noise and potential safety hazards introduced by it and improving the long-term working reliability of the device. This invention relates to an anti-interference atomic gas chamber with an electromagnetic shielding layer. By setting a protective layer, the shielding layer can be effectively prevented from being scratched, oxidized, or corroded during daily operation, installation, or in harsh environments, thus maintaining the long-term stability of the shielding effectiveness and extending the service life of the atomic gas chamber. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a structural schematic diagram of the front cross-section of this utility model.

[0015] Reference numerals: 1. Gas chamber body; 2. Electromagnetic shielding layer; 3. Insulating layer; 4. Protective layer; 5. Optical transmission window; 6. Heating electrode. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Example

[0017] Please see Figure 1-2 This invention proposes a technical solution for an anti-interference atomic gas chamber with an electromagnetic shielding layer: An anti-interference atomic gas chamber with an electromagnetic shielding layer includes a chamber body 1, specifically, the chamber body 1 is typically made of glass or silicon-based glass, forming a sealed cavity; the interior of the chamber body 1 is sealed with alkali metal atomic vapor and a buffer gas. The key feature is that the outer surface of the chamber body 1 is provided with at least one electromagnetic shielding layer 2 for shielding external electromagnetic interference. Specifically, the electromagnetic shielding layer 2 attenuates external electromagnetic waves through absorption and reflection; an insulating layer 3 is provided between the chamber body 1 and the electromagnetic shielding layer 2. Specifically, the insulating layer 3 covers the outer surface of the chamber body 1, and its function is electrical isolation, preventing the subsequent electromagnetic shielding layer 2 from directly contacting the heating electrode 6. The contact causes a short circuit, while providing a flat and firm substrate for the electromagnetic shielding layer 2. The outer surface of the electromagnetic shielding layer 2 is also provided with a protective layer 4. Specifically, the protective layer 4 prevents the electromagnetic shielding layer from being damaged by mechanical scratches, oxidation or corrosion, ensuring the stability of its long-term shielding performance, and provides additional electrical insulation. It can be encapsulated with epoxy resin, parylene or another insulating film. The gas chamber body 1 is provided with several optical light transmission windows 5 and heating electrodes 6. Specifically, there are usually two or more optical light transmission windows 5, which are used for the incident and emitted lasers and are the key areas for realizing the interaction between light and atoms. The heating electrodes 6 are attached to the surface of the gas chamber body 1 and provide a constant temperature environment for the gas chamber body 1 by electric heating, ensuring that the alkali metal generates sufficient vapor pressure.

[0018] Furthermore, the electromagnetic shielding layer 2 is a thin metal film formed directly on the outer surface of the gas chamber body 1 by magnetron sputtering, electroplating or chemical plating.

[0019] In this embodiment, the structure is extremely compact, the electromagnetic shielding layer 2 is uniform and perfectly fits the shape of the air chamber body 1, and has good thermal conductivity.

[0020] Furthermore, the material of the metal thin film is one or more combinations of copper, silver, gold, nickel, manganese zinc ferrite materials.

[0021] Furthermore, the electromagnetic shielding layer 2 is an independently formed metal shielding cover, and the air chamber body 1 is embedded inside the metal shielding cover. The metal shielding cover is formed by stamping metal sheet or made of metal wire mesh.

[0022] In this embodiment, the aim is to further improve the broadband shielding effectiveness.

[0023] Furthermore, the insulating layer 3 is one of a silicon dioxide film, an aluminum oxide film, or a polyimide film.

[0024] In this embodiment, it has good insulation, high thermal conductivity and excellent adhesion, and can be formed by physical vapor deposition or coating curing process.

[0025] Furthermore, the electromagnetic shielding layer 2 is a multi-layer composite structure, including at least one layer with high conductivity and one layer with high magnetic permeability.

[0026] In this embodiment, the inner layer is a high permeability layer (such as a nickel-based alloy thin film) to absorb low-frequency magnetic field interference, and the outer layer is a high conductivity layer (such as a copper film) to reflect high-frequency electromagnetic interference.

[0027] Thin-film integrated atomic gas chamber: such as Figures 1-2 As shown, in this embodiment, the atomic gas chamber has a chamber body 1 made of glass. First, a silicon dioxide thin film with a thickness of about 5-20 micrometers is deposited on its outer surface as an insulating layer 3 by plasma-enhanced chemical vapor deposition. Then, a copper film with a thickness of 2-10 micrometers is deposited on the insulating layer 3 as an electromagnetic shielding layer 2 by magnetron sputtering. Finally, a polyimide layer is coated on the outside of the copper film as a protective layer 4 by spin coating. During the deposition process, a mask is used to protect the connection area of ​​the optical transmission window 5 and the heating electrode 6 to ensure that these functional areas are not covered.

[0028] Independent hood-type atomic gas chamber: such as Figures 1-2As shown, in this embodiment, a thin polyimide insulating layer 3 is first formed on the outside of the gas chamber body 1. Then, a cup-shaped metal shield with an opening, made of 0.1mm thick permalloy plate and stamped, is used as the electromagnetic shielding layer 2 and is precisely fitted onto the outside of the gas chamber body 1 to make it fit tightly. Finally, the entire assembly is potted with epoxy resin to form a protective layer 4 and to fix it.

[0029] To further improve performance, the electromagnetic shielding layer 2 can adopt a three-layer structure: first, a 1-micrometer-thick nickel layer (high magnetic permeability layer 2a) is sputtered on the insulating layer 3, then a 3-micrometer-thick copper layer (high electrical conductivity layer 2b) is sputtered, and finally a 1-micrometer-thick nickel layer is sputtered as a protective layer and a magnetic path enhancement layer. This structure can provide excellent shielding against both low-frequency magnetic fields and high-frequency radio frequency interference.

[0030] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An anti-interference atomic gas chamber with an electromagnetic shielding layer, comprising a chamber body (1), wherein the interior of the chamber body (1) is sealed with alkali metal atomic vapor and a buffer gas, characterized in that, The outer surface of the air chamber body (1) is provided with at least one electromagnetic shielding layer (2) for shielding external electromagnetic interference. An insulating layer (3) is provided between the air chamber body (1) and the electromagnetic shielding layer (2). A protective layer (4) is also provided on the outer surface of the electromagnetic shielding layer (2). Several optical light transmission windows (5) and heating electrodes (6) are provided on the air chamber body (1).

2. The anti-interference atomic gas chamber with an electromagnetic shielding layer according to claim 1, characterized in that, The electromagnetic shielding layer (2) is a thin metal film formed directly on the outer surface of the gas chamber body (1) by magnetron sputtering, electroplating or chemical plating.

3. The anti-interference atomic gas chamber with an electromagnetic shielding layer according to claim 1, characterized in that, The electromagnetic shielding layer (2) is an independently formed metal shielding cover, and the air chamber body (1) is embedded inside the metal shielding cover. The metal shielding cover is formed by stamping metal sheet or made of metal wire mesh.

4. The anti-interference atomic gas chamber with an electromagnetic shielding layer according to claim 1, characterized in that, The insulating layer (3) is one of silicon dioxide film, aluminum oxide film, and polyimide film.

5. The anti-interference atomic gas chamber with an electromagnetic shielding layer according to claim 1, characterized in that, The electromagnetic shielding layer (2) is a multi-layer composite structure, including at least one high conductivity layer and one high magnetic permeability layer.

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