A convection-suppressed vacuum structure for atomic spin inertial measurement device

Abstract

A convection-suppressed vacuum structure for an atomic spin inertial measurement device integrates multiple discrete vacuum cavities through a number of vacuum joints to form a vacuum overall structure, which is conducive to realizing modular design of the device, reducing the difficulty of disassembly and assembly, facilitating debugging, reducing the number of optical elements in the optical path, and further reducing device noise. The invention is characterized in that it includes a magnetic shielding barrel vacuum cavity having a top plate and a bottom plate, the inner cavity of the magnetic shielding barrel vacuum cavity is a vacuum cavity for installing the magnetic shielding barrel and a sensitive meter head, the left side wall is connected to the detection light path entering the barrel vacuum cavity through the eleventh vacuum joint, the right side wall is connected to the detection light path exiting the barrel vacuum cavity through the seventh vacuum joint, the top plate is connected to the upper pumping light path vacuum cavity through the fifth vacuum joint, and the bottom plate is connected to the lower pumping light path vacuum cavity through the ninth vacuum joint. Each vacuum cavity is both an independent structure and a vacuum entity integrated together through vacuum joints.

Description

Technical Field

[0001] The present invention relates to the technical field of convection noise suppression in atomic spin inertial measurement devices, and in particular to a convection suppression vacuum structure for an atomic spin inertial measurement device. A plurality of separate vacuum cavities are integrated together through a plurality of vacuum joints to form an integral vacuum structure, which is conducive to realizing a modular design of the device, reducing the difficulty of assembly and disassembly, facilitating device debugging, and reducing the number of optical elements in the optical path, thereby further reducing the noise of the device. Background Art

[0002] In the study of atomic spin inertial measurement, the suppression of convective noise is very critical. The inventors have found that placing the optical path and the sensitive meter head in a vacuum is an effective way to reduce the influence of the external environment on the output signal of the device and to suppress the convective noise caused by the fluctuation of the optical path and the sensitive meter head caused by airflow disturbances. The inventors believe that by designing a convection suppression vacuum structure for the atomic spin inertial measurement device, for example, setting the device into multiple cavities, it is beneficial to the modular design of each part and the independent debugging of each part, reducing the difficulty of disassembly and assembly; connecting all vacuum structures in series into a vacuum whole is beneficial to the entry and exit of the optical path in the sensitive meter head, and the windows at the entry and exit of the sensitive meter head can be removed, which is beneficial to the long-term stability of the optical path performance and has a huge effect on the convective noise suppression of the device. In view of this, the inventors have completed this invention. Summary of the Invention

[0003] In response to the defects or shortcomings in the prior art, the present invention provides a convection-suppressed vacuum structure for an atomic spin inertial measurement device. Multiple discrete vacuum cavities are integrated together through a number of vacuum joints to form an overall vacuum structure, which is conducive to the modular design of the device, reduces the difficulty of disassembly and assembly, facilitates the debugging of the device, and at the same time reduces the number of optical elements in the optical path, further reducing the noise of the device.

[0004] The technical solutions of the present invention are as follows:

[0005] A convection-suppressed vacuum structure for an atomic spin inertial measurement device, characterized in that it includes a centrally arranged magnetic shielding barrel vacuum cavity, the magnetic shielding barrel vacuum cavity having a magnetic shielding barrel vacuum cavity top plate and a magnetic shielding barrel vacuum cavity bottom plate, the inner cavity of the magnetic shielding barrel vacuum cavity being a vacuum cavity for installing the magnetic shielding barrel and a sensitive meter head, the left side wall of the magnetic shielding barrel vacuum cavity being connected to the detection light path entering the barrel vacuum cavity through an eleventh vacuum joint, the right side wall of the magnetic shielding barrel vacuum cavity being connected to the detection light path exiting the barrel vacuum cavity through a seventh vacuum joint, the top plate of the magnetic shielding barrel vacuum cavity being connected to the upper pumping light path vacuum cavity through a fifth vacuum joint, the bottom plate of the magnetic shielding barrel vacuum cavity being connected to the lower pumping light path vacuum cavity through a ninth vacuum joint, and each vacuum cavity being both an independent structure and a vacuum whole integrated together through vacuum joints.

[0006] The front side wall and the rear side wall of the vacuum cavity of the magnetic shielding barrel are both provided with vacuum joints (such as the eighth vacuum joint).

[0007] The detection light path entering the barrel vacuum cavity is provided with a detection light path entering the barrel vacuum cavity side wall window on its detection light path entering the barrel vacuum cavity side wall, and a plurality of vacuum joints (for example, the twelfth vacuum joint) are provided on the top wall of the detection light path entering the barrel vacuum cavity.

[0008] The bottom plate of the detection light path entering the barrel vacuum cavity is provided with optical element mounting threaded holes for mounting and fixing optical elements and lasers.

[0009] The upper pumping light path vacuum chamber includes an upper pumping light path vacuum chamber top plate and a two-position array of threaded holes on the bottom surface of the upper pumping light path vacuum chamber body located on the bottom plate. A third vacuum joint and a fourth vacuum joint are provided on the left side wall of the upper pumping light path vacuum chamber, and a first vacuum joint and a second vacuum joint are provided on the right side wall of the upper pumping light path vacuum chamber.

[0010] The lower pumping light path vacuum chamber includes a top plate and a bottom plate, the bottom plate is provided with a two-dimensional array of threaded holes in the bottom plate of the lower pumping light path vacuum chamber, the right side of the lower pumping light path vacuum chamber is provided with an adjustment port extending to the right, and the rear side and front side of the lower pumping light path vacuum chamber are both provided with vacuum joints (for example, the tenth vacuum joint).

[0011] The technical effects of the present invention are as follows: The present invention provides a convection-suppressed vacuum structure for an atomic spin inertial measurement device, which places the optical path and the sensitive meter head in a vacuum, thereby reducing the influence of the external environment on the output signal of the device and suppressing the convection noise caused by the fluctuation of the optical path and the sensitive meter head due to airflow disturbance. In particular, by setting the vacuum structure as a structure connected by multiple cavities, it is conducive to the modular design of each part and the independent debugging of each part, reducing the difficulty of disassembly and assembly; in particular, all vacuum structures are connected in series into a vacuum whole through the connection between the cavities, which is conducive to the optical path entering and exiting the sensitive meter head, and the window at the entrance and exit of the sensitive meter head can be removed, which is conducive to the long-term stability of the optical path performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The present invention is a schematic structural diagram of a convection-suppressed vacuum structure of an atomic spin inertial measurement device.

[0013] The reference numerals are as follows: 1-top plate of the upper pumping light path vacuum chamber; 2-first vacuum joint; 3-upper pumping light path vacuum chamber; 4-second vacuum joint; 5-threaded hole on the bottom surface of the upper pumping light path vacuum chamber body; 6-fifth vacuum joint; 7-third vacuum joint; 8-fourth vacuum joint; 9-vacuum joint on the top plate of the magnetic shielding barrel vacuum chamber, i.e., the sixth vacuum joint; 10-magnetic shielding barrel vacuum chamber (which contains the vacuum chamber for installing the magnetic shielding barrel and the sensitive meter head); 11-seventh vacuum joint; 12-detection light path out of the barrel vacuum chamber ;13-eighth vacuum joint;14-magnetic shielding barrel vacuum chamber top plate;15-magnetic shielding barrel vacuum chamber bottom plate;16-ninth vacuum joint;17-lower pumping light path vacuum chamber;18-adjustment port;19-tenth vacuum joint;20-threaded hole of the bottom plate of the lower pumping light path vacuum chamber;21-lower pumping light path vacuum chamber top plate;22-eleventh vacuum joint;23-detection light path entering the barrel vacuum chamber side wall;24-detection light path entering the barrel vacuum chamber side wall window;25-detection light path entering the barrel vacuum chamber;26-twelfth vacuum joint. DETAILED DESCRIPTION

[0014] Below is the attached figure ( Figure 1 ) and Examples illustrate the present invention.

[0015] Figure 1 This is a schematic diagram of a convection-suppressed vacuum structure of an atomic spin inertial measurement device according to the present invention. Figure 1 As shown, a convection suppression vacuum structure of an atomic spin inertial measurement device includes a centrally arranged magnetic shielding barrel vacuum chamber 10, wherein the magnetic shielding barrel vacuum chamber 10 has a magnetic shielding barrel vacuum chamber top plate 14 and a magnetic shielding barrel vacuum chamber bottom plate 15. The inner cavity of the magnetic shielding barrel vacuum chamber 10 is a vacuum chamber for installing a sensitive meter head. The left side wall of the magnetic shielding barrel vacuum chamber 10 is connected to the detection light path inlet barrel vacuum chamber 25 through the eleventh vacuum joint 22, and the right side wall of the magnetic shielding barrel vacuum chamber 10 is connected to the detection light path outlet barrel vacuum chamber 12 through the seventh vacuum joint 11. The magnetic shielding barrel vacuum chamber top plate 14 is connected to the upper pumping light path vacuum chamber 3 through the fifth vacuum joint 6, and the magnetic shielding barrel vacuum chamber bottom plate 15 is connected to the lower pumping light path vacuum chamber 17 through the ninth vacuum joint 16. Each vacuum chamber is both an independent structure and a vacuum whole integrated together through vacuum joints.

[0016] The front and rear sidewalls of the magnetic shielding barrel vacuum chamber 10 are both provided with vacuum connectors (e.g., the eighth vacuum connector 13). The detection light path entry barrel vacuum chamber 25 is provided with a detection light path entry barrel vacuum chamber sidewall window 24 (for monitoring the wavelength and optical power of the optical path) on its detection light path entry barrel vacuum chamber sidewall 23. Several vacuum connectors (e.g., the twelfth vacuum connector 26) are provided on the top wall of the detection light path entry barrel vacuum chamber 25. The bottom plate of the detection light path entry barrel vacuum chamber 25 is provided with optical element mounting threaded holes for mounting and fixing optical elements and lasers.

[0017] The upper pumping optical path vacuum chamber 3 includes an upper pumping optical path vacuum chamber top plate 1 and a two-dimensional array of threaded holes 5 on the bottom surface of the upper pumping optical path vacuum chamber body located on the bottom plate (for mounting optical or electrical components, etc.). The left wall of the upper pumping optical path vacuum chamber 3 is provided with a third vacuum joint 7 and a fourth vacuum joint 8 (spare design, which can be used for electrical interfaces and fiber feedthroughs). The right wall of the upper pumping optical path vacuum chamber 3 is provided with a first vacuum joint 2 and a second vacuum joint 4 (spare design, which can be used for electrical interfaces and fiber feedthroughs). The lower pumping optical path vacuum chamber 17 includes a top plate and a bottom plate. The bottom plate is provided with a two-dimensional array of threaded holes 20 on the bottom plate of the lower pumping optical path vacuum chamber. The right side of the lower pumping optical path vacuum chamber 17 is provided with an adjustment port 18 extending to the right (for adjusting and opening the optical path). Vacuum joints (such as the tenth vacuum joint 19, etc.) are provided on the rear and front sides of the lower pumping optical path vacuum chamber 17.

[0018] If a sensitive meter head vacuum chamber is provided within the magnetic shielding barrel vacuum chamber, a vacuum joint (e.g., the sixth vacuum joint 9, which is the vacuum joint between the magnetic shielding barrel and the top plate of the sensitive meter head vacuum chamber) must be provided between the sensitive meter head vacuum chamber and the magnetic shielding barrel for communication. Alternatively, the magnetic shielding barrel vacuum chamber and the sensitive meter head vacuum chamber may be a single vacuum chamber, with the magnetic shielding barrel inside, and the sensitive meter head inside.

[0019] A convection-suppressed vacuum structure design for an atomic spin inertial measurement device not only allows the device's optical path, meter head and other sensitive components to be installed within the designed overall vacuum structure, reducing the impact of the external environment on the device's output signal and suppressing convection noise caused by airflow disturbances leading to fluctuations in the optical path and sensitive meter head; it also maintains the independence of each component, achieving a modular design of the device, reducing the difficulty of disassembly and assembly, and facilitating device debugging; at the same time, it reduces the number of optical elements in the optical path, further reducing the device's noise. A convection-suppressed vacuum structure for an atomic spin inertia measurement device comprises a magnetic shielding barrel and a sensitive meter head vacuum cavity, an upper pumping light path vacuum cavity, a lower pumping light path vacuum cavity, a detection light path entry barrel vacuum cavity, and a detection light path exit barrel vacuum cavity. The magnetic shielding barrel and the sensitive meter head vacuum cavity are cylindrical, while the upper pumping light path vacuum cavity, the lower pumping light path vacuum cavity, the detection light path entry barrel vacuum cavity, and the detection light path exit barrel vacuum cavity are square and are provided with optical path mounting threaded holes inside for the installation of optical components. The cavities are connected by vacuum joints to form a vacuum whole, and the optical path can freely enter and exit the magnetic shielding barrel and the sensitive meter head vacuum cavity through the connection to achieve low convection noise atomic spin inertia measurement.

[0020] The magnetic shielding barrel and the sensitive head vacuum cavity include a bottom plate, a side wall and a top plate. The bottom plate is provided with mounting threaded holes for installing and fixing the magnetic shielding barrel and the sensitive head. A vacuum joint is provided in the center for connecting with the lower pumping light path vacuum cavity, so that the lower pumping light can enter from here; the side wall is provided with a vacuum joint for connecting with the detection light path entering the barrel vacuum cavity and the detection light path exiting the barrel vacuum cavity, so that the detection light can enter and exit from here, and the remaining joints are used for electrical joints and vacuum pump interfaces; a vacuum joint is provided in the center of the top plate for connecting with the upper pumping light path vacuum cavity, so that the upper pumping light can enter from here.

[0021] The upper pumping light path vacuum cavity includes a main body and a top plate. The bottom surface of the main body is provided with an optical element mounting threaded hole for mounting and fixing the optical element. The side is provided with a vacuum joint for introducing the pumping laser and an electrical joint. The center of the bottom surface is provided with a vacuum joint that connects the magnetic shielding barrel and the vacuum cavity of the sensitive meter head, and the pumping light enters the magnetic shielding barrel and the vacuum cavity of the sensitive meter head from there. The top plate is used to seal the upper pumping light path vacuum cavity.

[0022] The lower pumping light path vacuum chamber includes a bottom plate, side walls and a top plate. The bottom plate is provided with optical element mounting threaded holes for mounting and fixing optical elements; the side walls are provided with vacuum joints and side wall adjustment ports. The vacuum joints are used for laser introduction and electrical connections, and the side wall adjustment ports are used for optical path adjustment and opening; the top plate is provided with a vacuum joint that connects the magnetic shielding barrel and the sensitive head vacuum chamber, and the lower pumping light enters the magnetic shielding barrel and the sensitive head vacuum chamber from there.

[0023] The detection light path entering the barrel vacuum cavity includes a bottom plate, side walls and a top plate. The bottom plate is provided with optical element mounting threaded holes for installing and fixing optical elements and lasers; the side wall is provided with a vacuum joint connected to the magnetic shielding barrel and the sensitive head vacuum cavity, and the detection light enters the magnetic shielding barrel and the sensitive head vacuum cavity from there; the side wall is also provided with a window for monitoring the wavelength and optical power of the light path; the top plate is provided with a vacuum joint for electrical interface and optical fiber feedthrough.

[0024] The detection light path barrel vacuum cavity includes a bottom plate, side walls and a top plate. The bottom plate is provided with optical element mounting threaded holes for installing and fixing optical elements; the side wall is provided with a vacuum joint connected to the magnetic shielding barrel and the sensitive head vacuum cavity, for receiving detection light from the magnetic shielding barrel and the sensitive head vacuum cavity; the top plate is provided with a vacuum joint for electrical interface and optical fiber feedthrough.

[0025] A convection-suppressed vacuum structure for an atomic spin inertial measurement device is configured as a structure with multiple connected cavities. Specifically, all vacuum structures are connected in series to form a single vacuum entity through the connections between the cavities. Placing the optical path and sensitive head in a vacuum can reduce the impact of the external environment on the device's output signal and suppress convection noise caused by fluctuations in the optical path and sensitive head due to airflow disturbances. Arranging the device into multiple cavities facilitates modular design and independent debugging of each part, reducing the difficulty of disassembly and assembly. Connecting all vacuum structures in series to form a single vacuum entity facilitates the entry and exit of the optical path into and out of the sensitive head, and allows the removal of windows at the entry and exit points, which promotes the long-term stability of the optical path performance.

[0026] like Figure 1 As shown, a convection-suppressed vacuum structure design for an atomic spin inertial measurement device includes a magnetic shielding barrel and a sensitive meter head vacuum cavity 10, an upper pumping light path vacuum cavity 3, a lower pumping light path vacuum cavity 17, a detection light path entry barrel vacuum cavity 25, and a detection light path exit barrel vacuum cavity 12.

[0027] A magnetic shielding barrel and sensitive meter head vacuum chamber sidewall is disposed in the middle of the magnetic shielding barrel and sensitive meter head vacuum chamber 10. The magnetic shielding barrel and sensitive meter head vacuum chamber sidewall vacuum joints 11, 13, and 22 are disposed on the magnetic shielding barrel and sensitive meter head vacuum chamber sidewall. A magnetic shielding barrel and sensitive meter head vacuum chamber top plate 14 is disposed directly above the magnetic shielding barrel and sensitive meter head vacuum chamber sidewall. A magnetic shielding barrel and sensitive meter head vacuum chamber bottom plate 15 is disposed directly below the magnetic shielding barrel and sensitive meter head vacuum chamber sidewall.

[0028] The magnetic shielding barrel and the sensitive meter head vacuum chamber 10 are connected to the upper pumping light path vacuum chamber 3 through the vacuum joint 9 on the top plate of the magnetic shielding barrel and the sensitive meter head vacuum chamber, and the upper pumping light path vertically enters the magnetic shielding barrel and the sensitive meter head vacuum chamber 10;

[0029] The magnetic shielding barrel and sensitive meter head vacuum chamber 10 is connected to the lower pumping optical path vacuum chamber 17 through the magnetic shielding barrel and sensitive meter head vacuum chamber bottom plate vacuum joint 16, and the lower pumping optical path vertically enters the magnetic shielding barrel and sensitive meter head vacuum chamber 10;

[0030] The magnetic shielding barrel and sensitive meter head vacuum chamber 10 is connected to the detection light path entry barrel vacuum chamber 25 through the vacuum joint 22 on the side wall of the magnetic shielding barrel and sensitive meter head vacuum chamber, and the detection light path enters the magnetic shielding barrel and sensitive meter head vacuum chamber 10 horizontally from there;

[0031] The magnetic shielding barrel and sensitive meter head vacuum cavity 10 is connected to the detection light path barrel vacuum cavity 12 through the vacuum joint 11 on the side wall of the magnetic shielding barrel and sensitive meter head vacuum cavity, and the detection light path is horizontally emitted from the magnetic shielding barrel and sensitive meter head vacuum cavity 10 to the detection light path barrel vacuum cavity 12.

[0032] The upper pumping optical path vacuum chamber 3 is located directly above the magnetic shielding barrel and the sensitive meter head vacuum chamber 10. The side walls of the upper pumping optical path vacuum chamber 3 are provided with upper pumping optical path vacuum chamber side wall vacuum joints 2, 4, 7, and 8. The bottom surface of the upper pumping optical path vacuum chamber 3 is provided with an upper pumping optical path vacuum chamber bottom surface threaded hole 5. The center of the bottom surface of the upper pumping optical path vacuum chamber 3 is provided with an upper pumping optical path vacuum chamber bottom surface vacuum joint 6. The upper pumping optical path vacuum chamber top plate 1 is provided directly above the upper pumping optical path vacuum chamber 3.

[0033] The lower pumping light path vacuum chamber 17 is located directly below the magnetic shielding barrel and the sensitive meter head vacuum chamber 10. A lower pumping light path vacuum chamber side wall is provided in the middle of the lower pumping light path vacuum chamber 17. The lower pumping light path vacuum chamber side wall vacuum joint 19 and the lower pumping light path vacuum chamber side wall adjustment port 18 are provided on the lower pumping light path vacuum chamber side wall. A lower pumping light path vacuum chamber top plate 21 is provided directly above the lower pumping light path vacuum chamber side wall. A lower pumping light path vacuum chamber bottom plate is provided directly below the lower pumping light path vacuum chamber side wall. The lower pumping light path vacuum chamber bottom plate threaded hole 20 is provided on the lower pumping light path vacuum chamber bottom plate.

[0034] The detection light path entry barrel vacuum chamber 25 is located on the side of the magnetic shielding barrel and sensitive meter head vacuum chamber 10. A detection light path entry barrel vacuum chamber sidewall 23 is located in the middle of the detection light path entry barrel vacuum chamber 25. A detection light path entry barrel vacuum chamber sidewall window 24 is located on the detection light path entry barrel vacuum chamber sidewall 23. A detection light path entry barrel vacuum chamber top plate is located directly above the detection light path entry barrel vacuum chamber sidewall 23. A detection light path entry barrel vacuum chamber top plate vacuum joint 26 is located on the detection light path entry barrel vacuum chamber top plate.

[0035] The detection light path exit barrel vacuum cavity 12 is located on the side of the magnetic shielding barrel and sensitive meter head vacuum cavity 10 , and is symmetrically placed with the detection light path entry barrel vacuum cavity 25 relative to the magnetic shielding barrel and sensitive meter head vacuum cavity 10 .

[0036] Any content not described in detail in this specification is prior art known to those skilled in the art. It should be noted that the above description is intended to help those skilled in the art understand the present invention, but does not limit the scope of protection of the present invention. Any equivalent substitution, modification, improvement, and / or simplification of the above description that does not depart from the essence of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A convection-suppressed vacuum structure for an atomic spin inertial measurement device, characterized in that: It includes a centrally arranged magnetic shielding barrel vacuum cavity, which has a magnetic shielding barrel vacuum cavity top plate and a magnetic shielding barrel vacuum cavity bottom plate. The inner cavity of the magnetic shielding barrel vacuum cavity is a vacuum cavity for installing the magnetic shielding barrel and the sensitive meter head. The left side wall of the magnetic shielding barrel vacuum cavity is connected to the detection light path entering the barrel vacuum cavity through the eleventh vacuum joint, and the right side wall of the magnetic shielding barrel vacuum cavity is connected to the detection light path exiting the barrel vacuum cavity through the seventh vacuum joint. The top plate of the magnetic shielding barrel vacuum cavity is connected to the upper pumping light path vacuum cavity through the fifth vacuum joint, and the bottom plate of the magnetic shielding barrel vacuum cavity is connected to the lower pumping light path vacuum cavity through the ninth vacuum joint. Each vacuum cavity is both an independent structure and a vacuum whole integrated together through vacuum joints.

2. The convection suppression vacuum structure for an atomic spin inertial measurement device according to claim 1, wherein: The front side wall and the rear side wall of the vacuum cavity of the magnetic shielding barrel are both provided with vacuum joints.

3. The convection suppression vacuum structure for an atomic spin inertial measurement device according to claim 1, wherein: The detection light path entering the barrel vacuum cavity is provided with a detection light path entering the barrel vacuum cavity side wall window on its detection light path entering the barrel vacuum cavity side wall window, and the detection light path entering the barrel vacuum cavity is provided with a plurality of vacuum joints on the top wall.

4. The convection suppression vacuum structure for an atomic spin inertial measurement device according to claim 1, wherein: The bottom plate of the detection light path entering the barrel vacuum cavity is provided with optical element mounting threaded holes for mounting and fixing optical elements and lasers.

5. The convection suppression vacuum structure for an atomic spin inertial measurement device according to claim 1, wherein: The upper pumping light path vacuum chamber includes an upper pumping light path vacuum chamber top plate and a two-position array of threaded holes on the bottom surface of the upper pumping light path vacuum chamber body located on the bottom plate. A third vacuum joint and a fourth vacuum joint are provided on the left side wall of the upper pumping light path vacuum chamber, and a first vacuum joint and a second vacuum joint are provided on the right side wall of the upper pumping light path vacuum chamber.

6. The convection suppression vacuum structure for an atomic spin inertial measurement device according to claim 1, wherein: The lower pumping light path vacuum chamber includes a top plate and a bottom plate, the bottom plate is provided with a two-dimensional array of threaded holes of the lower pumping light path vacuum chamber bottom plate, the right side of the lower pumping light path vacuum chamber is provided with an adjustment port extending to the right, and the rear side and front side of the lower pumping light path vacuum chamber are both provided with vacuum joints.

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