Novel heating uniformity heat preservation structure applied to alkali metal atom gas chamber of inertial sensor

Abstract

A novel heating uniformity heat preservation structure applied to an alkali metal atom air chamber of an inertial sensor can reduce the temperature gradient in the air chamber after heating and play a role in heat preservation and heat insulation, and is characterized by comprising an internal layered mortise and tenon inserting structure, a middle layered inserting buckle ceramic heating structure and an external detachable heat preservation and heat insulation structure, the inner layered mortise and tenon inserting structure adopts a design method of a variable heat superstructure material, a boron nitride oven structure of the same size can be replaced, better temperature uniformity and robustness are achieved, a single flexible non-magnetic electric heating film is attached to the surface of the upper layer of the middle layered ceramic heating structure, and the thickness of the middle layered ceramic heating structure is larger than that of the inner layered mortise and tenon inserting structure. A flexible circuit board of a temperature measuring platinum resistor is attached to the surface of the lower layer of the middle layered ceramic heating structure, the external detachable heat preservation and heat insulation structure is made of polyether-ether-ketone PEEK, and the whole novel heating uniformity heat preservation structure of the alkali metal atom air chamber has better temperature uniformity and robustness. The method is applied to the double-beam atomic spin inertial sensor.

Description

Technical Field

[0001] The invention relates to the technical field of heating an alkali metal gas chamber in an atomic spin inertial sensor device, in particular to a detachable novel heating uniformity heat preservation structure applied to an alkali metal atomic gas chamber of an inertial sensor. Background Art

[0002] With the development of quantum precision measurement, atomic spin inertial sensors play an incomparable role in a series of cutting-edge scientific explorations and applications. This is based on the quantum precision measurement technology of atomic ensembles, using atomic gas chambers as the medium to study the interaction between high-performance atomic gas chambers and light, such as ultra-high sensitivity magnetic field measurement, high-precision angular velocity measurement, etc. When using atomic gas chambers, they must be heated at high temperatures with high precision to make them work at the optimal temperature point and maintain the high density and stability of alkali metal atoms. Therefore, the uniformity and stability of temperature is an important factor affecting quantum precision measurement. The temperature uniformity can be improved by improving the external oven of the gas chamber.

[0003] At present, the commonly used alkali metal heating oven material is high thermal conductivity boron nitride, and its structure is suitable for single-beam and double-beam atomic spin inertial sensors. Therefore, light holes are set on the front and back, left and right outer surfaces of the oven, and the through-hole position of the air chamber to cut off the air handle needs to be reserved inside the oven. The heating film is directly attached to the outer surface of the boron nitride oven. In order to ensure the uniformity of heating, more than two symmetrically distributed heating films are usually set. Because boron nitride has high thermal conductivity, when heated to the operating temperature, the heat will be transferred to other structural parts inside the atomic spin inertial sensor, such as photodetectors, optical fibers and collimators, which will have an adverse effect on the components. Therefore, it is necessary to design a thermal insulation structure outside the oven to insulate heat, and use low thermal conductivity polyetheretherketone (PEEK) to wrap the outside of the oven to reduce the conduction of heat to non-oven locations.

[0004] Thermal metamaterials are artificial materials with special thermal properties. Their core feature is that they can exhibit thermal conductivity characteristics that are unmatched by traditional materials through the precise design of the microscopic or macroscopic structure of the material. These materials can effectively regulate the direction, speed and distribution of heat flow, and have great potential in regulating temperature uniformity. Through reasonable structural design, thermal metamaterials can achieve directional transmission of heat flow between different regions, thereby achieving a uniform distribution of the temperature field. This feature makes thermal metamaterials have important applications in fields such as efficient thermal management and enhanced heat transfer, and is especially suitable for high-precision thermal control systems that require temperature uniformity structures. Summary of the invention

[0005] The technical problem to be solved by the present invention is: in view of the defects or shortcomings in the prior art, namely, the fast heat dissipation of the remaining parts without the heating film and the limitation of the temperature uniformity inside the atomic gas chamber, a new heating uniformity insulation structure applied to the alkali metal atomic gas chamber of the inertial sensor is provided, which can improve the temperature uniformity after the gas chamber is heated. When heating on one side, the temperature uniformity can be better than that of the conventional boron nitride oven structure of the same size, providing a new idea for the miniaturization of atomic spin inertial sensors, and at the same time avoiding the conduction of heat inside the oven structure to other positions, thereby playing a role of thermal insulation.

[0006] The technical solution of the present invention is as follows:

[0007] A novel heating uniformity insulation structure applied to an alkali metal atomic gas chamber of an inertial sensor, characterized in that it comprises an internal layered mortise and tenon plug-in structure, a middle layered plug-in buckle ceramic heating structure and an external detachable thermal insulation structure, wherein the internal layered mortise and tenon plug-in structure can replace a boron nitride oven structure of the same size and has better temperature uniformity and robustness, a single-piece flexible non-magnetic electric heating film is attached to the upper surface of the middle layered ceramic heating structure, a flexible circuit board of a temperature measuring platinum resistor is attached to the lower surface of the middle layered ceramic heating structure, the material of the external detachable thermal insulation structure is polyetheretherketone (PEEK), uniformly distributed threaded holes are provided at the connection of the detachable thermal insulation structure, and M1.4 high-temperature alloy screws are used for connection, and the novel heating uniformity insulation structure of the overall alkali metal atomic gas chamber is applied to a dual-beam atomic spin inertial sensor.

[0008] The internal layered mortise and tenon joint structure uses the design method of transformation thermal superstructure materials, and designs a layered configuration based on coordinate transformation theory and equivalent medium theory. The design principle mainly relies on its precise control of heat flow. Through reasonable microstructure design (such as periodically arranged nanopores, layered configuration or gradient material), the heat flow can be effectively guided and distributed. Specifically, the thermal metastructure material can balance the local temperature difference by designing multiple levels of material structure and the spatial distribution of thermal conductivity, thereby achieving the effect of optimizing temperature uniformity.

[0009] The internal layered mortise and tenon plug-in structure is composed of toothed layered patches of different sizes, with a total of 6 layers, each layer consisting of 4 patches, a total of 24 patches, the outer dimensions and tooth shapes of each layer of toothed layered patches of the internal layered mortise and tenon plug-in structure are the same, wherein all tooth shapes are of the same type, that is, the sizes of the teeth of the 6 types of toothed layered patches are the same, and two of the four patches in each layer are provided with light-through holes in the centers, which are located on the left and right sides of the internal layered mortise and tenon plug-in structure respectively, one of the four patches in each layer is provided with a through hole for the reserved position of the air chamber handle, which is located on the lower side of the internal layered mortise and tenon plug-in structure, and one of the four patches in each layer is not provided with a through hole, which is located on the upper side of the internal layered mortise and tenon plug-in structure.

[0010] The 6 layers of toothed layered patches of the internal layered mortise and tenon joint structure are made of different materials. The design principle is based on the design method of transformation thermal superstructure materials, and the theoretical design is based on the coordinate transformation theory, and the layered structure material selection is carried out in conjunction with the equivalent medium theory. Finally, 24 patches are made of 4 materials with different thermal conductivities, which are cross-distributed in the internal layered mortise and tenon joint structure to form a new heating uniformity insulation structure core that can replace the same-sized boron nitride oven structure and has better temperature uniformity and robustness.

[0011] The middle layered plug-in buckle ceramic heating structure consists of two parts, the front half is provided with square grooves around the connection with the rear half, and the rear half is provided with square buckles of corresponding sizes around the connection with the front half. Semicircular light-through holes are provided on the left and right sides of the front half, corresponding to the semicircular light-through holes of the rear half, forming the left and right light-through holes of the middle layered plug-in buckle ceramic heating structure, and are coaxial with the left and right light-through holes of the internal layered mortise and tenon plug-in structure.

[0012] The material of the middle layered plug-in buckle ceramic heating structure is boron nitride, aluminum nitride or aluminum oxide.

[0013] The external detachable thermal insulation structure consists of a left and a right part, wherein the left part is the main base, and a square groove is arranged in the middle, whose size is the same as the short side of the middle layered plug-in buckle ceramic heating structure, and the long side is reserved on the original size to place the flexible non-magnetic electric heating film and the flexible circuit board position attached with the temperature measuring platinum resistor. The left base of the external detachable thermal insulation structure has a large volume, and plays the role of fixing the internal layered mortise and tenon plug-in structure and the middle layered plug-in buckle ceramic heating structure. The right part of the external detachable thermal insulation structure is a rectangular plate with a long side groove, which corresponds to the left part of the external detachable thermal insulation structure to ensure that the flexible circuit board can extend from the groove position, so that the end of the flexible circuit board is connected to the host computer.

[0014] The external detachable thermal insulation structure is respectively provided with light holes on the left and right sides and light holes on the front and back sides. The positions of the light holes on the left and right sides are coaxial with the light holes on the left and right sides of the middle layered plug-in buckle ceramic heating structure, and the positions of the light holes on the front and back sides correspond to the center of the atomic gas chamber. The overall alkali metal atomic gas chamber new heating uniformity thermal insulation structure can pass vertical double light beams.

[0015] Compared with the prior art, the present invention can improve the temperature uniformity after heating the gas chamber, that is, it has better temperature uniformity and robustness than the conventional boron nitride oven structure of the same size. Under the premise of ensuring the temperature inside the gas chamber, the number of heating films can be reduced, and only a single heating film can be used to heat it, thereby reducing the workload in the temperature control system design process and experimental testing process. In addition, the overall structure is small in size and can be applied to the inside of a miniaturized atomic spin inertial sensor prototype. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a schematic structural diagram of a novel heating uniformity heat preservation structure applied to an alkali metal atom gas chamber of an inertial sensor.

[0017] Figure 2 for Figure 1 Overall cross-section diagram.

[0018] Figure 3 yes Figure 1 Schematic diagram of the structure of the middle layered plug-in buckle ceramic heating structure.

[0019] Figure 4 yes Figure 1 Schematic diagram of the structure of the middle and outer detachable thermal insulation structure.

[0020] Figure 5 yes Figure 1 Schematic diagram of the temperature distribution inside the alkali metal chamber during the steady-state thermal simulation of the middle inner layered mortise and tenon joint structure and the middle layered plug-in buckle ceramic heating structure.

[0021] Figure 6 yes Figure 5 Schematic diagram of the temperature distribution inside the alkali metal chamber in the steady-state thermal simulation of a boron nitride oven of the same size.

[0022] The description of the accompanying drawings is as follows: 1-external left base; 2-flexible non-magnetic electric heating film mounting groove; 3-external right cover plate; 4-right light hole; 5-flexible circuit board mounting groove for attaching temperature measuring platinum resistor; 6-external detachable thermal insulation structure fixing screws; 7-front light hole; 8-atomic gas chamber tail gas handle; 9-left light hole; 10-atomic gas chamber; 11-front layered plug-in ceramic heating structure; 12-internal layered mortise and tenon plug-in structure 24 patches; 13-right light hole supporting glass column; 14-left light hole supporting glass column; 15-rear light hole; 16-rear layered plug-in ceramic heating structure. DETAILED DESCRIPTION

[0023] The present invention is described below in conjunction with the accompanying drawings to make the purpose and technical solution of the present application clearer, but this should not limit the protection scope of the present invention.

[0024] Figure 1 Shown is a structural schematic diagram of a new heating uniformity insulation structure applied to the alkali metal atom gas chamber of an inertial sensor. Figure 2 for Figure 1 Overall cross-section diagram. Figure 3 yes Figure 1 Schematic diagram of the structure of the middle layered plug-in buckle ceramic heating structure. Figure 4 yes Figure 1 Schematic diagram of the structure of the middle and outer detachable thermal insulation structure. Figures 1 to 4 As shown, a novel heating uniformity insulation structure applied to the alkali metal atomic gas chamber of an inertial sensor comprises an external left base 1 and an external right cover plate 3 which are combined to form an external detachable thermal insulation structure, a square groove is arranged in the middle of the external detachable thermal insulation structure, and its size is the same as the short side of the middle layered plug-in buckle ceramic heating structure, and a flexible non-magnetic electric heating film mounting groove 2 and a flexible circuit board mounting groove 5 for attaching a temperature measuring platinum resistor are reserved on the original size of the long side, and the materials of the external left base 1 and the external right cover plate 3 are both polyetheretherketone PEEK. Four threaded holes are evenly distributed at the connection between the external left base 1 and the external right cover plate 3. The threaded holes adopt 30° trapezoidal threads and are connected by external detachable thermal insulation structure fixing screws 6. The specification of the external detachable thermal insulation structure fixing screws 6 is M1.4 high-temperature alloy screws. At a working temperature of 120°C, it can pass high-temperature adaptability verification (such as preload retention rate and thermal deformation compensation) and strength verification (such as shear strength, thread crush resistance). A right light hole 4 is set at the center of the external right cover plate 3, a front light hole 7 is set at the front center of the external left base 1, a rear light hole 15 is set at the rear center of the external left base 1, and a left light hole coaxial with the right light hole 4 is set at the left center of the external left base 1.

[0025] The internal structure of the novel heating uniformity insulation structure applied to the alkali metal atom gas chamber of the inertial sensor is as follows: Figure 2As shown in the cross-sectional view, from the inside to the outside, it is respectively composed of an alkali metal atom gas chamber 10, a middle layered plug-in ceramic heating structure and an external detachable thermal insulation structure. The outside of the alkali metal atom gas chamber 10 is wrapped layer by layer by 24 patches 12 of the internal layered mortise and tenon plug-in structure to form the internal layered mortise and tenon plug-in structure. The 24 patches 12 of the internal layered mortise and tenon plug-in structure are 6 layers in total, and each layer is composed of 4 patches with the same outer dimensions and tooth shapes on the top, bottom, left and right. There are a total of 6 different patches, but the size of the teeth of the tooth-shaped layered patches is the same, that is, all the tooth shapes of the 24 patches 12 of the internal layered mortise and tenon plug-in structure are the same. Two of the four patches in each layer are provided with light-through holes in their centers, and their positions are located on the left and right sides of the internal layered mortise and tenon joint structure, respectively, forming a right light-through hole 4 and a left light-through hole 9 as a whole. Since the material of the 24 patches 12 in the internal layered mortise and tenon joint structure is flexible and not very supportive, a right light-through hole supporting glass column 13 and a left light-through hole supporting glass column 14 are provided in the right light-through hole 4 and the left light-through hole 9, so that the left and right light beams can smoothly pass through the atomic gas chamber 10 without being blocked. One of the four patches in each layer is provided with a through hole for the reserved position of the gas chamber handle, and its position is located on the lower side of the internal layered mortise and tenon joint structure, forming a through hole that can pass through the gas handle 8 at the tail of the atomic gas chamber as a whole. One of the four patches in each layer is not provided with a through hole, and its position is located on the upper side of the internal layered mortise and tenon joint structure, so that the single-piece flexible non-magnetic electric heating film can smoothly conduct heat to the inside of the atomic gas chamber 10 after being attached. The six layers of toothed layered patches are made of different materials, and the principle of material selection is based on the design method of thermal stealth cloaks in transformation heat superstructure materials, and the theoretical design is based on the coordinate transformation theory, and the layered structure material selection is carried out in conjunction with the equivalent medium theory. Finally, the 24 patches 12 of the internal layered mortise and tenon joint structure are made of four materials with different thermal conductivities, which are cross-distributed in the internal layered mortise and tenon joint structure, forming a new heating uniformity insulation structure core that can replace the same-sized boron nitride oven structure and has better temperature uniformity and robustness.

[0026] Figure 5 is a schematic diagram of the temperature distribution inside the alkali metal chamber in the steady-state thermal simulation of the internal layered mortise and tenon joint structure and the middle layered plug-in buckle ceramic heating structure, Figure 6 yes Figure 5 Schematic diagram of the temperature distribution inside the alkali metal chamber in the steady-state thermal simulation of the same-sized boron nitride oven. The same simulation conditions were used for both. The heating film was heated on the upper layer on one side, and natural heat convection existed in both cases. Figure 5 The temperature gradient inside the atomic gas chamber is 0.53K. Figure 6 The temperature gradient inside the atomic gas chamber is 1.03K. Figure 5 and Figure 6It can be seen from the simulation results that the structure of the present invention can replace the boron nitride oven structure of the same size, and can reduce the temperature gradient inside the alkali metal atom gas chamber by about one time.

[0027] The structural schematic diagram of the middle layered plug-in buckle ceramic heating structure is as follows: Figure 3 As shown, the main structure is composed of a front layered plug-in buckle ceramic heating structure 11 and a rear layered plug-in buckle ceramic heating structure 16, and is installed by plug-in buckle. Since the frame thickness is small, only 1mm thick, it cannot be installed through threaded holes and screws, so it is connected in the form of corresponding square pins and grooves. The front layered plug-in buckle ceramic heating structure 11 is provided with square pins at the four corners, and the rear layered plug-in buckle ceramic heating structure 16 is provided with square grooves of corresponding sizes at the four corners. The positions of the square pins and grooves are shown in FIG. Figure 3 As shown, this distribution method can make the middle layered plug-in buckle ceramic heating structure stable to install and easy to disassemble. The front layered plug-in buckle ceramic heating structure 11 is provided with a front light-through hole 7 in the center, and the rear layered plug-in buckle ceramic heating structure 16 is provided with a rear light-through hole 15 in the center. The front light-through hole 7 and the rear light-through hole 15 are coaxial, so that the front and rear light beams can pass through the atomic gas chamber 10 smoothly without being blocked. The left and right sides of the front layered plug-in buckle ceramic heating structure 11 and the rear layered plug-in buckle ceramic heating structure 16 are respectively provided with corresponding semicircular light-through holes, which together constitute the right light-through hole 4 and the left light-through hole 9 of the middle layered plug-in buckle ceramic heating structure. The two are coaxial, so that the left and right light beams can pass through the atomic gas chamber 10 smoothly. The material of the middle layered plug-in buckle ceramic heating structure is boron nitride, aluminum nitride or aluminum oxide. Since the material has the advantages of high thermal conductivity, low thermal expansion and high temperature stability, the heating film is attached to the middle layered plug-in buckle ceramic heating structure, which can efficiently and evenly conduct heat to the internal layered mortise and tenon plug-in structure wrapped by the middle layered plug-in buckle ceramic heating structure.

[0028] The structural schematic diagram of the external detachable thermal insulation structure is as follows: Figure 4As shown, the installation groove 2 of the flexible non-magnetic electric heating film and the installation groove 5 of the flexible circuit board with attached temperature measuring platinum resistor are not blocked by the external right cover plate 3, so that the flexible circuit board can extend from the groove position, so that the end of the flexible circuit board is connected to the host computer. The external left base 1 and the external right cover plate 3 are connected by the external detachable heat preservation and heat insulation structure fixing screws 6, and the installation and disassembly are simple and reliable. The material of the external left base 1 and the external right cover plate 3 is polyetheretherketone PEEK, which has excellent properties such as high temperature resistance, easy processing and high mechanical strength. The thermal conductivity of this material is low, which can reduce the internal heat conduction to the non-oven position at the working temperature, which has an adverse effect on the external optical components and plays a role in heat preservation and heat insulation.

[0029] Furthermore, the novel heating uniformity insulation structure of the present invention has a small overall size. The outer size of the external detachable thermal insulation structure is 20mm×16mm×20mm, which can be applied to the interior of a miniaturized atomic spin inertial sensor prototype. By using the design principle of thermal metamaterials, the temperature uniformity of the heated gas chamber can be improved, that is, it has better temperature uniformity and robustness than a conventional boron nitride oven structure of the same size. While ensuring the temperature inside the gas chamber, the number of heating films can be reduced, and only a single heating film can be used for heating, thereby reducing the workload during the temperature control system design process and experimental testing process.

[0030] The contents not described in detail in the specification of the present invention belong to the prior art known to the professional and technical personnel in the field. It is pointed out here that the above description helps those skilled in the art to understand the invention, but does not limit the protection scope of the invention. Any equivalent replacement, modification and / or simplification of the above description without departing from the essence of the invention falls within the protection scope of the invention.

Claims

1. A novel heating uniformity insulation structure applied to the alkali metal atom gas chamber of an inertial sensor, characterized in that: It includes an internal layered mortise and tenon plug-in structure, a middle layered plug-in buckle ceramic heating structure and an external detachable thermal insulation structure. The internal layered mortise and tenon plug-in structure can replace the same-sized boron nitride oven structure and has better temperature uniformity and robustness. The upper surface of the middle layered ceramic heating structure is attached with a single-piece flexible non-magnetic electric heating film, and the lower surface of the middle layered ceramic heating structure is attached with a flexible circuit board of a temperature measuring platinum resistor. The material of the external detachable thermal insulation structure is polyetheretherketone (PEEK), and evenly distributed threaded holes are arranged at the connection of the detachable thermal insulation structure, which is connected with M1.4 high-temperature alloy screws. The new heating uniformity thermal insulation structure of the overall alkali metal atomic gas chamber is applied to the dual-beam atomic spin inertial sensor.

2. The novel heating uniformity insulation structure for the alkali metal atom gas chamber of the inertial sensor according to claim 1 is characterized in that: The internal layered mortise and tenon joint structure uses the design method of transformation thermal superstructure materials, and designs a layered configuration based on coordinate transformation theory and equivalent medium theory. The design principle mainly relies on its precise control of heat flow. Through reasonable microstructure design (such as periodically arranged nanopores, layered configuration or gradient material), the heat flow can be effectively guided and distributed. Specifically, the thermal metastructure material can balance the local temperature difference by designing multiple levels of material structure and the spatial distribution of thermal conductivity, thereby achieving the effect of optimizing temperature uniformity.

3. The novel heating uniformity insulation structure applied to the alkali metal atom gas chamber of the inertial sensor according to claim 1 is characterized in that: The internal layered mortise and tenon plug-in structure is composed of toothed layered patches of different sizes, with a total of 6 layers, each layer consisting of 4 patches, a total of 24 patches, the outer dimensions and tooth shapes of each layer of toothed layered patches of the internal layered mortise and tenon plug-in structure are the same, wherein all tooth shapes are of the same type, that is, the sizes of the teeth of the 6 types of toothed layered patches are the same, and two of the four patches in each layer are provided with light-through holes in the centers, which are located on the left and right sides of the internal layered mortise and tenon plug-in structure respectively, one of the four patches in each layer is provided with a through hole for the reserved position of the air chamber handle, which is located on the lower side of the internal layered mortise and tenon plug-in structure, and one of the four patches in each layer is not provided with a through hole, which is located on the upper side of the internal layered mortise and tenon plug-in structure.

4. The novel heating uniformity insulation structure applied to the alkali metal atom gas chamber of the inertial sensor according to claim 1 is characterized in that: The 6 layers of toothed layered patches of the internal layered mortise and tenon joint structure are made of different materials. The design principle is based on the design method of transformation thermal superstructure materials, and the theoretical design is based on the coordinate transformation theory, and the layered structure material selection is carried out in conjunction with the equivalent medium theory. Finally, 24 patches are made of 4 materials with different thermal conductivities, which are cross-distributed in the internal layered mortise and tenon joint structure to form a new heating uniformity insulation structure core that can replace the same-sized boron nitride oven structure and has better temperature uniformity and robustness.

5. The novel heating uniformity insulation structure applied to the alkali metal atom gas chamber of the inertial sensor according to claim 1 is characterized in that: The middle layered plug-in buckle ceramic heating structure consists of two parts, the front half is provided with square grooves around the connection with the rear half, and the rear half is provided with square buckles of corresponding sizes around the connection with the front half. Semicircular light-through holes are provided on the left and right sides of the front half, corresponding to the semicircular light-through holes of the rear half, forming the left and right light-through holes of the middle layered plug-in buckle ceramic heating structure, and are coaxial with the left and right light-through holes of the internal layered mortise and tenon plug-in structure.

6. The novel heating uniformity insulation structure applied to the alkali metal atom gas chamber of the inertial sensor according to claim 1 is characterized in that: The material of the middle layered plug-in buckle ceramic heating structure is boron nitride, aluminum nitride or aluminum oxide.

7. The novel heating uniformity insulation structure applied to the alkali metal atom gas chamber of the inertial sensor according to claim 1 is characterized in that: The external detachable thermal insulation structure consists of a left and a right part, wherein the left part is the main base, and a square groove is arranged in the middle, whose size is the same as the short side of the middle layered plug-in buckle ceramic heating structure, and the long side is reserved on the original size to place the flexible non-magnetic electric heating film and the flexible circuit board position attached with the temperature measuring platinum resistor. The left base of the external detachable thermal insulation structure has a large volume, and plays the role of fixing the internal layered mortise and tenon plug-in structure and the middle layered plug-in buckle ceramic heating structure. The right part of the external detachable thermal insulation structure is a rectangular plate with a long side groove, which corresponds to the left part of the external detachable thermal insulation structure to ensure that the flexible circuit board can extend from the groove position, so that the end of the flexible circuit board is connected to the host computer.

8. The novel heating uniformity insulation structure applied to the alkali metal atom gas chamber of the inertial sensor according to claim 1 is characterized in that: The external detachable thermal insulation structure is respectively provided with light holes on the left and right sides and light holes on the front and back sides. The positions of the light holes on the left and right sides are coaxial with the light holes on the left and right sides of the middle layered plug-in buckle ceramic heating structure, and the positions of the light holes on the front and back sides correspond to the center of the atomic gas chamber. The overall alkali metal atomic gas chamber new heating uniformity thermal insulation structure can pass vertical double light beams.

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