Atomic vapor pool made of PMMA material and used for low-frequency electric field measurement and manufacturing method of atomic vapor pool

Abstract

The invention discloses a PMMA (polymethyl methacrylate) material atomic vapor pool for low-frequency electric field measurement and a manufacturing method thereof, the atomic vapor pool comprises a pool body made of PMMA material and a convex opening hermetically arranged on the pool body, the convex opening is communicated with an inner cavity of the pool body, and the convex opening is used for vacuumizing the interior of the pool body and filling alkali metal cesium atoms into the pool body. The structure is reliable, the cell body structure is made of a specific PMMA material, the conductivity of the PMMA material is small after cesium atoms are adsorbed, the low-frequency electric field shielding effect caused by adsorption of the cesium atoms is reduced under the condition that the optical property of the material and the influence of the electric field are not changed, the shielding effect is effectively reduced, and measurement of the space low-frequency electric field is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of quantum measurement, and in particular to an atomic vapor cell of PMMA material for low-frequency electric field measurement and a manufacturing method thereof. Background Art

[0002] Atomic vapor cells filled with alkali metal atoms are currently the main devices of electric field sensors. However, the adsorption of alkali metal atoms will cause a thin conductive layer to form inside the atomic vapor cell, which hinders the measurement of low-frequency electric fields.

[0003] The current solution is generally to place the electrode plate inside the atomic vapor cell to make an atomic vapor cell with a built-in electrode plate. By loading the electric field internally, the shielding of the low-frequency electric field by the glass atomic gas chamber is avoided, thereby achieving the measurement of the low-frequency electric field.

[0004] However, with the development of intelligent power systems, when trying to introduce quantum electric field sensors into the power system, due to the limitations of the built-in plates, the voltage of the low-frequency electric field is limited, making it impossible to measure the low-frequency electric field. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides an atomic vapor cell of PMMA material for low-frequency electric field measurement and a manufacturing method thereof.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: an atomic vapor cell made of PMMA material for low-frequency electric field measurement, comprising a cell body made of PMMA material and a protrusion sealed on the cell body, the protrusion is connected to the inner cavity of the cell body, and the protrusion is used to evacuate the interior of the cell body and fill it with alkali metal cesium atoms.

[0007] Furthermore, the radius of the pool body is 15mm-18mm, and the length is 45mm-50mm.

[0008] Furthermore, the thickness of the cell body is 0.5mm-0.8mm.

[0009] The present invention also provides a method for making an atomic vapor cell of PMMA material for low-frequency electric field measurement, comprising the following steps:

[0010] S1: Select PMMA tubes or sheets of suitable size;

[0011] S2: Make the PMMA tube or sheet into a cell structure;

[0012] S3: drilling holes on the pool body, and then sealing and installing protrusions at the drilled holes;

[0013] S4: Clean the pool body to remove impurities and debris;

[0014] S5: evacuating the cell body through the protrusion, then filling the cell body with metal cesium atoms, and then sealing the cell body;

[0015] S6: Check the air tightness of the cell body and detect the concentration of metallic cesium atoms in the cell body.

[0016] Furthermore, when the cell body is cleaned in step S4, isopropyl alcohol or deionized water is used to clean the cell body.

[0017] The present invention has the following beneficial effects: the atomic vapor cell of PMMA material for low-frequency electric field measurement and the manufacturing method thereof provided by the present invention have reliable structure, and the cell body structure is made of a specific PMMA material. After cesium atoms are adsorbed, the conductivity of the PMMA material is relatively small. Under the condition of ensuring that the optical properties and electric field influence of the material remain unchanged, the low-frequency electric field shielding effect caused by the adsorption of cesium atoms is reduced, the shielding effect is effectively reduced, and the measurement of the low-frequency electric field in space is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 is a flow chart of the production of the atomic vapor pool of the present invention;

[0020] Figure 1 to Figure 2 The reference numerals shown in the figure represent respectively: 1-cell body, 2-protrusion. DETAILED DESCRIPTION

[0021] 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.

[0022] like Figure 1 As shown, an atomic vapor cell of PMMA material for low-frequency electric field measurement includes a cell body 1 made of PMMA material and a protrusion 2 sealed on the cell body 1, the protrusion 2 is connected to the inner cavity of the cell body 1, and the protrusion 2 is used to evacuate and fill the cell body 1 with alkali metal cesium atoms. The atomic vapor cell is made of PMMA material, and the low-frequency electric field shielding effect caused by the adsorption of cesium atoms is reduced while ensuring that the optical properties and electric field effects of the material remain unchanged, thereby realizing the measurement of the low-frequency electric field in space. Preferably, the radius of the cell body 1 is 15mm-18mm, the length is 45mm-50mm, and the thickness of the cell body 1 is 0.5mm-0.8mm.

[0023] Specifically, when using PMMA to make an atomic vapor pool, in addition to considering the low-frequency electric field shielding effect caused by the adsorption of cesium atoms, its optical parameter characteristics and the influence characteristics on the electric field must also be considered. The optical characteristics are mainly reflected in the refractive index of the material, which reflects the influence of the atomic vapor pool on the transmittance of the laser. The electric field influence characteristics are mainly reflected by the relative dielectric constant of the material. Compare the parameters of PMMA materials with the characteristics of commonly used borosilicate glass materials:

[0024]

[0025] By comparing the material parameters, it can be seen that the optical property parameters and electric field influence parameters of PMMA are close to the material parameters of glass, and the material properties after cesium atoms are adsorbed are semiconductors, which can meet the optical and electric field influence characteristics of the atomic vapor pool while effectively reducing the low-frequency electric field shielding after cesium atoms are adsorbed.

[0026] In addition, if Figure 2 As shown, the present invention also provides a method for making an atomic vapor cell of PMMA material for low-frequency electric field measurement, comprising the following steps:

[0027] S1: Select PMMA tubes or sheets of suitable size;

[0028] S2: Making a PMMA tube or sheet into a cell body 1 structure;

[0029] S3: drilling a hole on the tank body 1, and then sealing and installing the protrusion 2 at the drilled hole;

[0030] S4: Clean the cell body 1 to remove impurities and debris. When cleaning the cell body 1, use isopropyl alcohol or deionized water to clean the cell body 1.

[0031] S5: vacuumizing the cell body 1 through the protrusion 2, then filling the cell body 1 with metal cesium atoms, and then sealing the cell body 1;

[0032] S6: Check the air tightness of the cell body 1 and detect the concentration of metal cesium atoms in the cell body 1.

[0033] 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 atomic vapor cell of PMMA material for low-frequency electric field measurement, characterized in that: The invention comprises a cell body (1) made of PMMA material and a protrusion (2) sealed on the cell body (1), wherein the protrusion (2) is connected to the inner cavity of the cell body (1), and the protrusion (2) is used to evacuate the interior of the cell body (1) and fill the cell body (1) with alkali metal cesium atoms.

2. The atomic vapor cell of PMMA material for low-frequency electric field measurement according to claim 1, characterized in that: The pool body (1) has a radius of 15 mm to 18 mm and a length of 45 mm to 50 mm.

3. The atomic vapor cell of PMMA material for low-frequency electric field measurement according to claim 1, characterized in that: The thickness of the cell body (1) is 0.5 mm-0.8 mm.

4. A method for making an atomic vapor cell of PMMA material for low-frequency electric field measurement according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1: Select PMMA tubes or sheets of suitable size; S2: Making a PMMA tube or sheet into a cell body (1) structure; S3: drilling a hole on the tank body (1), and then sealing and installing a protrusion (2) at the drilled hole; S4: cleaning the tank body (1) to remove impurities and debris; S5: evacuating the cell body (1) through the protrusion (2), then filling the cell body (1) with metal cesium atoms, and then sealing the cell body (1); S6: Check the air tightness of the cell body (1) and detect the concentration of metal cesium atoms in the cell body (1).

5. The method for making an atomic vapor cell of PMMA material for low-frequency electric field measurement according to claim 4, characterized in that: When the cell body (1) is cleaned in step S4, isopropyl alcohol or deionized water is used to clean the cell body (1).

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