A heating and temperature - uniformity device for SERF atomic cell

Abstract

The present invention relates to a heating and temperature - equalizing device for a SERF atomic gas cell, which includes a temperature - equalizing liquid, a sealed oven assembly, and a composite temperature - equalizing and heat - insulating assembly. A closed cavity is provided inside the sealed oven assembly, and the temperature - equalizing liquid fills the closed cavity, so that the atomic gas cell assembly placed in the closed cavity is immersed in the temperature - equalizing liquid. The composite temperature - equalizing and heat - insulating assembly is wrapped around the outside of the sealed oven assembly. The atomic gas cell assembly, the sealed oven assembly, and the composite temperature - equalizing and heat - insulating assembly are fixedly connected through a connecting and limiting rod that penetrates through the bottom of the sealed oven assembly in a sealed manner. An inner sealed cavity and an outer sealed cavity are provided on the composite temperature - equalizing and heat - insulating assembly. A temperature - equalizing gas is filled in the inner sealed cavity, and the outer sealed cavity is a vacuum cavity. The present invention effectively improves the uniformity of the gas cell temperature and reduces the adverse effects on the external magnetic compensation coil.

Description

Technical Field

[0001] The present invention belongs to the technical field of atomic inertial measurement, and particularly relates to a heating and uniform heating device for a SERF atomic cell. Background Art

[0002] With the development of quantum measurement and control technology, since the first verification of the SERF atomic spin inertial measurement principle was achieved at Princeton University in 2005, SERF gyroscopes have become one of the development directions of the next generation of high-precision gyroscopes due to their ultra-high theoretical precision potential.

[0003] As the core part of the entire SERF gyroscope, the atomic number density in the atomic cell directly affects the interaction between laser and atoms, the collision rate between atoms, and relaxation. And the atomic number density in the atomic cell is closely related to the internal temperature of the atomic cell. Therefore, high-stability and high-uniformity control of the atomic cell temperature is particularly important for SERF gyroscopes. At present, in order to achieve high-stability and high-uniformity control of the atomic cell temperature, an oven heating and composite layer heat insulation structure is widely adopted in the thermal structure design, as described in patents 201910610671.2 and 202011536413.3. This oven heating and composite layer heat insulation structure achieves a relatively high stability of the atomic cell temperature, but the temperature uniformity is limited by the presence of light passing holes in the oven structure and is difficult to improve, with a large gap from the actual requirements, becoming one of the important factors restricting the improvement of the accuracy of SERF gyroscopes. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a heating and uniform heating device for a SERF atomic cell.

[0005] The above object of the present invention is achieved by the following technical solutions:

[0006] A heating and uniform heating device for a SERF atomic cell, characterized in that: it includes a uniform heating liquid, a sealed oven assembly, and a composite uniform heating and heat insulation assembly; a closed cavity is provided inside the sealed oven assembly, the uniform heating liquid fills the closed cavity, so that the atomic cell assembly placed in the closed cavity is immersed in the uniform heating liquid; the composite uniform heating and heat insulation assembly is wrapped outside the sealed oven assembly; the atomic cell group, the sealed oven assembly, and the composite uniform heating and heat insulation assembly are fixedly connected through a connection limiting rod that penetrates through the bottom of the sealed oven assembly in a sealed manner;

[0007] An inner sealed cavity and an outer sealed cavity are provided on the composite uniform heating and heat insulation assembly, a uniform heating gas is filled in the inner sealed cavity, and the outer sealed cavity is a vacuum cavity.

[0008] Furthermore: the uniform heating liquid adopts a fluorine-bromine component liquid.

[0009] Further: The sealed oven assembly includes an aluminum nitride oven, a twisted heating wire, a light-transmitting glass sheet, and an aluminum nitride top cover. Spiral grooves are provided on each outer side surface of the aluminum nitride oven, and light-transmitting holes are provided in the middle of the front, back, left, and right side walls of the aluminum nitride oven. A set of twisted heating wires is embedded and adhered in each spiral groove, and high-temperature resistant heat-conducting silicone grease is filled. There are four light-transmitting glass sheets, and the four light-transmitting glass sheets are respectively bonded and fixed at the four light-transmitting holes on the aluminum nitride oven. The aluminum nitride top cover is bonded and fixed to the top of the aluminum nitride oven to form a closed cavity inside. A spiral groove is provided at the upper end of the aluminum nitride top cover, and a set of twisted heating wires is embedded and adhered in the spiral groove, and high-temperature resistant heat-conducting silicone grease is filled.

[0010] Further: The composite heat-uniforming and heat-insulating assembly includes a double-layer sealed cavity, a short tube, a long tube, and a double-layer sealed top cover. The double-layer sealed top cover is bonded and fixed to the top of the double-layer sealed cavity, and both are made of glass material. Inner sealed chambers and outer sealed chambers are provided on both the double-layer sealed cavity and the double-layer sealed top cover. The inner sealed chamber and the outer sealed chamber of the double-layer sealed top cover are respectively connected to an externally extending short tube, the outer sealed chamber of the double-layer sealed cavity is connected to an externally extending short tube, and the inner sealed chamber of the double-layer sealed cavity is connected to two externally extending long tubes. The long tubes and the short tubes are sealed by extrusion deformation and sealed welding at the outer ends.

[0011] Further: The heat-uniforming gas is nitrogen.

[0012] Advantages and positive effects of the present invention:

[0013] 1. In the sealed oven assembly of the present invention, the design of the heat-uniforming liquid avoids the temperature low points caused by the structural limitations of the light-transmitting holes in the oven in principle, greatly improves the heat smoothing effect from the oven generating heat to the atomic gas chamber being heated, and effectively improves the uniformity of the gas chamber temperature.

[0014] 2. The oven material of the present invention is designed as aluminum nitride, and the heat conductivity is increased by more than 5 times compared with the currently mainstream applied boron nitride material, effectively improving the heat transfer efficiency of the oven.

[0015] 3. The design of the double-wound heating wire spiral distribution on the outer surface of the oven assembly of the present invention has the same heat generation uniformity as the currently mainstream applied heating film design, and at the same time has more excellent non-magnetism, which is particularly important for SERF gyroscopes with extremely weak magnetic environment requirements.

[0016] 4. The design of the inner and outer double-layer cavities for heat-uniforming and heat-insulating of the composite heat-uniforming and heat-insulating assembly of the present invention further improves the uniformity of the gas chamber temperature internally and further reduces the interface temperature of the external installation interface of the heating and heat-uniforming device externally, thereby reducing the adverse impact on the external magnetic compensation coil. Description of the Drawings

[0017] Figure 1 is the overall cross-sectional view of the present invention;

[0018] Figure 2 is the three-dimensional external view of the present invention;

[0019] Figure 3 is the three-dimensional exploded view of the present invention;

[0020] Figure 4 is the mating diagram of the atomic gas cell, heat-uniforming liquid and sealed oven assembly of the present invention;

[0021] Figure 5 is the cross-sectional view of the composite heat-uniforming and heat-insulating assembly of the present invention. Detailed implementation manners

[0022] The structure of the present invention will be further described below in conjunction with the accompanying drawings and through embodiments. It should be noted that this embodiment is narrative rather than restrictive.

[0023] A heating and heat-uniforming device for a SERF atomic gas cell, please refer to Figures 1 - 5 , and its inventive points are as follows: It includes a heat-uniforming liquid 2, a sealed oven assembly 3, and a composite heat-uniforming and heat-insulating assembly 5. The inside of the sealed oven assembly is filled with the heat-uniforming liquid, and the heat-uniforming liquid is a high-boiling-point, high-purity, isotropic fluorine-bromine component liquid. The atomic gas cell assembly 1 is immersed in the heat-uniforming liquid and is fixedly connected to the sealed oven assembly through a connecting and limiting rod 4, and the fixing method is bonding with a high-temperature resistant photosensitive adhesive; the outside of the sealed oven assembly is the composite heat-uniforming and heat-insulating assembly, and the two are fixedly connected through the connecting and limiting rod, and the fixing method is bonding with a high-temperature resistant photosensitive adhesive. Specifically, a boss 5.8 is provided in the middle of the inner bottom of the composite heat-uniforming and heat-insulating assembly, and a mounting hole 5.7 is provided at the center of the boss. The lower end of the connecting and limiting rod is inserted into the mounting hole and is fixedly bonded through a high-temperature resistant photosensitive adhesive. A through hole is provided at the center of the bottom of the sealed oven assembly, the connecting and limiting rod passes through the through hole, and is adhesively sealed with a high-temperature resistant photosensitive adhesive. The upper end of the connecting and limiting rod is fixedly bonded to the lower end of the atomic gas cell assembly through a high-temperature resistant photosensitive adhesive.

[0024] As shown in the attached Figure 3 and Figure 4As shown in the figure, the sealed oven assembly includes an aluminum nitride oven 3.3, a twisted heating wire 3.1, a light-transmitting glass slide 3.2, and an aluminum nitride top cover 3.4. The twisted heating wire is spirally and evenly distributed and fixedly connected to the outer surface of the aluminum nitride oven. The connection method is bonding with a high-temperature resistant photosensitive adhesive, and a high-temperature resistant thermal conductive silicone grease is filled in the spiral groove. There are 4 light-transmitting glass slides in total, and the material parameters are the same as those of the atomic gas cell wall glass. They are installed and fixedly connected to the light-transmitting holes of the aluminum nitride oven by bonding with a high-temperature resistant photosensitive adhesive. The aluminum nitride top cover is installed and fixedly connected to the top of the aluminum nitride oven by bonding with a high-temperature resistant photosensitive adhesive, so that the sealed oven assembly 3 forms a sealed cavity, which has the dual functions of accommodating the heat-uniform liquid 2 and heating the atomic gas cell 1.

[0025] As shown in the attached Figure 2 and Figure 5 figure, the composite heat-uniform and heat-insulating assembly includes a double-layer sealed cavity 5.3, short tubes 5.1, long tubes 5.4, a heat-uniform gas 5.6, and a double-layer sealed top cover 5.2. The double-layer sealed cavity and the double-layer sealed top cover are made of glass, and the material specifications are the same as those of the atomic gas cell wall glass. The inner sealed cavities of the double-layer sealed cavity and the double-layer sealed top cover are filled with a heat-uniform gas, and the heat-uniform gas is nitrogen, while the outer cavity is a vacuum cavity 5.5. There are 3 short tubes in total, made of glass. One short tube is hermetically installed and fixed on the outer side wall of the double-layer sealed cavity and is connected to the outer sealed cavity of the double-layer sealed cavity, which is used to connect a vacuum pumping device to realize the vacuum pumping treatment of the outer sealed cavity of the double-layer sealed cavity. The other 2 short tubes are hermetically installed and fixed on the side walls of the double-layer sealed top cover and are respectively connected to the inner sealed cavity and the outer sealed cavity of the double-layer sealed top cover, which are respectively used to pump the inner sealed cavity of the double-layer sealed top cover into a vacuum and fill it with a heat-uniform gas, and to pump the outer sealed cavity of the double-layer sealed top cover into a vacuum. There are 2 long tubes in total, made of glass. They are hermetically installed and fixedly connected to the outer side wall and the middle layer side wall of the double-layer sealed cavity and are connected to the inner sealed cavity of the double-layer sealed cavity, which is used to pump the inner sealed cavity of the double-layer sealed cavity into a vacuum and fill it with a heat-uniform gas. The connection method between the above-mentioned short tubes and the double-layer sealed cavity or between the short tubes and the double-layer sealed top cover is a threaded connection plus sealing with a high-temperature resistant thread sealant. The connection method between the above-mentioned long tubes and the outer side wall and the middle layer side wall of the double-layer sealed cavity is also a threaded connection plus sealing with a high-temperature resistant thread sealant. A switch valve is installed at the outer end of each of the above-mentioned short tubes and each of the long tubes, which is used for switching operations when pumping a vacuum and filling with a heat-uniform gas. When the atomic gas cell is in normal use, the outer ends of the long tubes and short tubes are sealed by extrusion deformation and sealed welding.

[0026] The above double-layer sealed top cover and the double-layer sealed cavity are fixedly connected, and the connection method is bonding with a high-temperature resistant photosensitive adhesive.

[0027] Although embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will understand that: within the spirit of the present invention and the appended claims, various substitutions, changes, and modifications are possible. Therefore, the scope of the present invention is not limited to the content disclosed in the embodiments and drawings.

Claims

1. A heating and heat - uniforming device for a SERF atomic gas cell, characterized in that: It includes a heat - uniforming liquid, a sealed oven assembly, and a composite heat - uniforming and heat - insulating assembly; a closed cavity is provided inside the sealed oven assembly, and the heat - uniforming liquid fills the closed cavity, immersing the atomic gas cell assembly placed in the closed cavity in the heat - uniforming liquid. The heat - uniforming liquid uses a fluorine - bromine component liquid; the composite heat - uniforming and heat - insulating assembly is wrapped outside the sealed oven assembly; the atomic gas cell assembly, the sealed oven assembly, and the composite heat - uniforming and heat - insulating assembly are fixedly connected through a connecting and limiting rod that penetrates through the bottom of the sealed oven assembly in a sealed manner. An inner sealed cavity and an outer sealed cavity are provided on the composite heat - uniforming and heat - insulating assembly. A heat - uniforming gas is filled in the inner sealed cavity, and the heat - uniforming gas uses nitrogen. The outer sealed cavity is a vacuum cavity. The sealed oven assembly includes an aluminum nitride oven, a twisted heating wire, a light - transmitting glass sheet, and an aluminum nitride top cover; a spiral groove is provided on each outer side surface of the aluminum nitride oven, and a light - transmitting hole is provided in the middle of each of the front, back, left, and right side walls of the aluminum nitride oven; a set of twisted heating wires is embedded and adhered in each spiral groove, and high - temperature heat - conductive silicone grease is filled; there are four light - transmitting glass sheets, and the four light - transmitting glass sheets are respectively adhesively fixed at the four light - transmitting holes on the aluminum nitride oven; the aluminum nitride top cover is adhesively fixed on the top of the aluminum nitride oven to form a closed cavity inside.

2. The heating and homogenizing device for the SERF atomic cell according to claim 1, wherein: The composite heat - uniforming and heat - insulating assembly includes a double - layer sealed cavity body, a short tube, a long tube, and a double - layer sealed top cover; the double - layer sealed top cover is adhesively fixed to the top of the double - layer sealed cavity body, and both are made of glass; an inner sealed chamber and an outer sealed chamber are provided on both the double - layer sealed cavity body and the double - layer sealed top cover; the inner sealed chamber and the outer sealed chamber of the double - layer sealed top cover are respectively connected to an outward - extending short tube, the outer sealed chamber of the double - layer sealed cavity body is connected to an outward - extending short tube, and the inner sealed cavity of the double - layer sealed cavity body is connected to two outward - extending long tubes; the outer ends of the long tube and the short tube are sealed by extrusion deformation and sealed welding.

Images