Two-dimensional angle adjusting device and laser gyroscope world time measuring system

Abstract

The utility model discloses a two -dimensional angle adjusting device and laser gyroscope world time measurement system, including work table, rotating structure and adjusting structure, rotating structure includes the first turntable of horizontal rotation and the second turntable adjusting structure of vertical rotation including adjusting frame, vertical micrometer, horizontal micrometer, first tension spring, second tension spring and lever arm, lever arm fixed end links with second turntable, and the fixed end of horizontal micrometer links with one of lever arm's adjusting end and adjusting frame, and its telescopic end is in contact with another, and vertical micrometer is perpendicular to horizontal plane arrangement, and its fixed end links with one of lever arm's adjusting end and adjusting frame, and its telescopic end is in contact with another, and first tension spring and second tension spring are compressed between adjusting frame and lever arm's adjusting end, and first tension spring provides horizontal tension to lever arm, and second tension spring provides vertical tension to lever arm. The utility model can realize low -cost high resolution's angle cavity angle adjustment, and the structure is simple, and angle adjustment precision is high.

Description

Technical Field

[0001] This utility model relates to the field of inertial technology, specifically to a two-dimensional angle adjustment device for a large laser gyroscope angular cavity and a laser gyroscope world time measurement system. Background Technology

[0002] Large laser gyroscopes can be used to measure Earth's rotation parameters and fundamental physics measurements (such as gravitational waves and Einstein's theory of relativity). Based on the Sagnac effect, theoretically, optical gyroscopes can be used to measure Earth's rotation parameters in real time, thereby calculating Earth information such as rotation parameters. At the same time, through precise measurement of Earth's rotation speed, it can also be applied to the observation of Earth solid tides, the detection of rotating seismic waves, and gravitational magnetic effects.

[0003] The large-scale laser gyroscope world time measurement system mainly consists of two sets of equipment: a radio frequency excited He-Ne laser gain tube and an ultra-long ring optical resonator. According to the Sagnac formula, the longer the ring optical resonator, the larger the scale factor, and the higher the resolution of the laser gyroscope. The ultra-long ring cavity places stringent requirements on mechanical performance, thermal stability, and cavity assembly and adjustment techniques.

[0004] For large laser gyroscopes with a cavity length of 8 meters, the adjustment mechanism for the cavity angle is particularly important. By adjusting the angle of the cavity, the angle between the laser incident from the prism into the cavity and the laser emitted from the prism in the cavity is 90°. The adjustment of the cavity angle involves two directions: horizontal angle and pitch angle. The adjustment range is ±3°, and the adjustment resolution is ≤5″ (arcsecond).

[0005] Most common angle adjustment platforms on the market use worm gear mechanisms for drive, which inevitably result in significant backlash and relatively high resolution, failing to meet usage requirements. High-precision angular displacement platforms often employ direct drive with torque motors. While this solution meets accuracy requirements, it is expensive and has a larger structural size. Under the same conditions, thermal expansion and contraction deformation will be greater, leading to slightly lower stability. Furthermore, the heat generated by the motor operation can affect the stability of other structural components. Utility Model Content

[0006] To address the problems in the background technology, this utility model proposes a two-dimensional angle adjustment device that can achieve low-cost, high-resolution cavity angle adjustment, with a simple structure and high angle adjustment accuracy.

[0007] The present invention adopts the following technical solution: A two-dimensional angle adjustment device includes a worktable, a rotating structure, and an adjustment structure. The rotating structure includes a first turntable and a second turntable. The first turntable is horizontally rotatably connected to the worktable, and the second turntable is hinged to the first turntable via a hinge shaft. The component to be adjusted is placed on the second turntable. The adjustment structure includes an adjustment frame, a vertical micrometer, a horizontal micrometer, a first tension spring, a second tension spring, and a lever arm. The adjustment frame is fixed on the worktable, with its hinge shaft arranged horizontally and perpendicular to the lever arm. The lever arm includes a connecting end and an adjusting end. The connecting end is connected to a second turntable. The horizontal micrometer is arranged parallel to the hinge shaft, with its fixed end connected to the adjusting end of the lever arm and one of the adjustment frame, and its telescopic end abutting against the other. The vertical micrometer is arranged perpendicular to the horizontal plane, with its fixed end connected to the adjusting end of the lever arm and one of the adjustment frame, and its telescopic end abutting against the other. Both the first and second tension springs are compressed between the adjustment frame and the adjusting end of the lever arm. The first tension spring provides a horizontal tension force to the lever arm, which is equal in magnitude and opposite in direction to the horizontal force exerted by the horizontal micrometer on the lever arm. The second tension spring provides a vertical tension force to the lever arm, which is equal in magnitude and opposite in direction to the vertical force exerted by the vertical micrometer on the lever arm.

[0008] As a further improvement to the above technical solution: The adjustment frame is equipped with a first horizontal pull rod, and the adjustment end of the lever arm is equipped with a second horizontal pull rod. The two hook ends of the second tension spring are respectively slidably mounted on the first horizontal pull rod and the second horizontal pull rod.

[0009] The adjustment frame is equipped with a first vertical pull rod, and the adjustment end of the lever arm is equipped with a second vertical pull rod. The two hook ends of the first tension spring are respectively slidably mounted on the first vertical pull rod and the second vertical pull rod.

[0010] The adjustment structure also includes a first top block, which is fixed on the adjustment end of the lever arm. The end face of the first top block facing the vertical micrometer is perpendicular to the axis of the vertical micrometer. The fixed end of the vertical micrometer is connected to the adjustment frame, and the telescopic end of the vertical micrometer abuts against the end face of the first top block facing the vertical micrometer.

[0011] The adjustment structure also includes a second top block, which is fixed on the adjustment frame. The end face of the second top block facing the horizontal micrometer is perpendicular to the axis of the horizontal micrometer. The fixed end of the horizontal micrometer is connected to the adjustment end of the lever arm, and the telescopic end of the horizontal micrometer abuts against the end face of the second top block facing the horizontal micrometer.

[0012] A vertical locking structure is provided between the worktable and the lever arm to lock the vertical position of the lever arm.

[0013] The vertical locking structure includes a limiting micrometer and a limiting seat. The limiting seat is fixed on the worktable, and the limiting micrometer is set on the lever arm. The limiting micrometer is arranged perpendicular to the horizontal plane, and its telescopic end is used to abut against the limiting seat.

[0014] A horizontal locking structure is provided between the worktable and the first turntable to lock the horizontal position of the lever arm.

[0015] The horizontal locking structure includes a screw and an oblong hole on the first turntable. The screw passes through the oblong hole and is threaded to the worktable. The screw can rotate to abut against the first turntable to fix the first turntable and the worktable together.

[0016] As a general inventive concept, this utility model also provides a laser gyroscope world time measurement system, including a ring optical resonant cavity channel, a radio frequency laser and four corner mirror assemblies. The radio frequency laser is disposed on the ring optical resonant cavity channel. The corner mirror assembly includes a corner cavity body and a two-dimensional angle adjustment device as described above. The four corner cavity bodies are respectively disposed at the four corners of the ring optical resonant cavity channel, and the corner cavity bodies are fixed on the second turntable of the corresponding two-dimensional angle adjustment device.

[0017] Compared with the prior art, the advantages of this utility model are: The angle adjustment device of this utility model adjusts the horizontal tension of the lever arm by adjusting the extension length of the telescopic end of the horizontal micrometer, thereby driving the lever arm, the connected rotating structure, and the component to be adjusted mounted on the rotating structure to rotate horizontally. Similarly, adjusting the vertical tension of the lever arm by adjusting the extension length of the telescopic end of the vertical micrometer adjusts the vertical tension of the lever arm by the second tension spring, thereby driving the lever arm, the connected rotating structure, and the component to be adjusted mounted on the rotating structure to rotate around the hinge axis in the vertical plane. The vertical distance from the prism on the corner chamber to the two rotation centers is l, and the distance from the adjusting end of the lever arm to the two rotation centers is its arm length L. The minimum resolution of the micrometer is 0.01 mm. According to the lever principle, the resolution of the corner chamber angle adjustment is 0.01 × l / L. Therefore, by adjusting the ratio l / L, this utility model can achieve low-cost, high-resolution corner chamber angle adjustment.

[0018] Furthermore, this invention utilizes a tension spring design, where the tension of the spring and the force exerted by the micrometer on the lever arm 36 create an action-reaction force. The tension of the spring ensures continuous contact between the micrometer and the adjusting frame 31 / lever arm 36, thereby eliminating return backlash. In addition, this invention designs two rotating platforms, coupled with two sets of micrometer + tension spring adjusting mechanisms, to achieve angle adjustment of the component to be adjusted in both horizontal and pitch directions. The angle adjustments in the two directions do not interfere with each other, further improving the angle adjustment accuracy of the angular cavity. Moreover, through ingenious structural design, the two adjusting mechanisms share a single lever arm, simplifying the structure, reducing accumulated errors and deformation, and contributing to the structural stability of precision optical instruments such as large laser gyroscopes. Attached Figure Description

[0019] To facilitate understanding of this invention, it will be described in more detail with reference to the specific embodiments shown in the accompanying drawings. These drawings depict only typical embodiments of this invention and should not be considered as limiting the scope of protection of this invention.

[0020] Figure 1 This is a three-dimensional structural diagram of the angle adjustment device in Embodiment 1 of this utility model.

[0021] Figure 2 This is a three-dimensional structural schematic diagram of the angle adjustment device of Embodiment 1 of this utility model from another perspective.

[0022] Figure 3 This is a three-dimensional structural diagram of the angle adjustment device in Embodiment 1 of this utility model (workbench omitted).

[0023] Figure 4 This is a three-dimensional structural diagram of the adjustment structure in Embodiment 1 of this utility model.

[0024] Figure 5 This is a three-dimensional structural diagram of the rotating structure in Embodiment 1 of this utility model.

[0025] Figure 6 This is a three-dimensional structural schematic diagram of the laser gyroscope world time measurement system of Embodiment 2 of this utility model.

[0026] Figure label: 1. Workbench; 2. Rotating structure; 21. First turntable; 22. Second turntable; 23. Hinge shaft; 24. Base plate; 25. Shaft seat; 3. Adjustment structure; 31. Adjustment frame; 311. First horizontal tie rod; 312. First vertical tie rod; 313. Rod seat; 32. Vertical micrometer; 33. Horizontal micrometer; 34. First tension spring; 35. Second tension spring; 36. Lever arm; 361. Connecting end; 362. Adjusting end; 363. Second horizontal tie rod; 364. Second vertical tie rod; 37. First top block; 38. Second top block; 4. Vertical locking structure; 41. Limiting micrometer; 42. Limiting seat; 5. Horizontal locking structure; 51. Screw; 52. Waist-shaped hole; 6. Corner chamber; 61. Prism. Detailed Implementation

[0027] The embodiments of the present invention are described below with reference to the accompanying drawings, so that those skilled in the art can better understand and implement the present invention. However, the listed embodiments are not intended to limit the present invention. In the absence of conflict, the following embodiments and the technical features in the embodiments can be combined with each other, wherein the same components are indicated by the same reference numerals.

[0028] like Figures 1-5As shown, this embodiment provides a two-dimensional angle adjustment device, including a worktable 1, a rotating structure 2, and an adjustment structure 3. The rotating structure 2 includes a first turntable 21 and a second turntable 22. The first turntable 21 is horizontally rotatably connected to the worktable 1, and the second turntable 22 is hinged to the first turntable 21 via a hinge shaft 23. The component to be adjusted is placed on the second turntable 22. The adjustment structure 3 includes an adjustment frame 31, a vertical micrometer 32, a horizontal micrometer 33, a first tension spring 34, a second tension spring 35, and a lever arm 36. The adjusting frame 31 is fixed on the workbench 1. The hinge shaft 23 is horizontally arranged and perpendicular to the lever arm 36. The lever arm 36 includes a connecting end 361 and an adjusting end 362. The connecting end 361 is connected to the second turntable 22. The horizontal micrometer 33 is arranged parallel to the hinge shaft 23. Its fixed end is connected to the adjusting end 362 of the lever arm 36 and one of the adjusting frame 31, and its telescopic end abuts against the other. The vertical micrometer 32 is arranged perpendicular to the horizontal plane. Its fixed end is connected to the adjusting end 362 of the lever arm 36 and one of the adjusting frame 31, and its telescopic end abuts against the other. The first tension spring 34 and the second tension spring 35 are both compressed between the adjusting bracket 31 and the adjusting end 362 of the lever arm 36. The first tension spring 34 is used to provide a horizontal tension force to the lever arm 36, which is equal in magnitude and opposite in direction to the horizontal force exerted by the horizontal micrometer 33 on the lever arm 36; The second tension spring 35 provides a vertical tension force to the lever arm 36, which is equal in magnitude but opposite in direction to the vertical force exerted by the vertical micrometer 32 on the lever arm 36.

[0029] Therefore, by adjusting the extension length of the telescopic end of the horizontal micrometer 33, the horizontal tension of the first tension spring 34 on the lever arm 36 is adjusted accordingly, thereby driving the lever arm 36, the rotating structure 2 connected thereto, and the component to be adjusted mounted on the rotating structure 2 to rotate horizontally. By adjusting the extension length of the telescopic end of the vertical micrometer 32, the vertical tension of the second tension spring 35 on the lever arm 36 is adjusted accordingly, thereby driving the lever arm 36 and its connected rotating structure 2, as well as the adjustable component mounted on the rotating structure 2, to rotate around the hinge axis 23 in the vertical plane. The vertical distance from the prism 61 on the corner chamber 6 to the two rotation centers is l, and the distance from the adjusting end 362 of the lever arm 36 to the two rotation centers is its arm length L. The minimum resolution of the micrometer is 0.01 mm. According to the lever principle, the resolution of the corner chamber angle adjustment is 0.01 × l / L. Therefore, by adjusting the ratio of l / L, this invention can achieve high-resolution corner chamber angle adjustment.

[0030] Furthermore, by designing a tension spring, this utility model creates an action and reaction force between the tension of the tension spring and the force exerted by the micrometer on the lever arm 36. The tension of the tension spring ensures that the micrometer maintains continuous contact with the adjusting frame 31 / lever arm 36, thereby eliminating the return gap. Furthermore, this invention designs two rotating platforms, combined with two sets of micrometer + tension spring adjustment mechanisms, to achieve angle adjustment of the component to be adjusted in both horizontal and pitch directions. The angle adjustments in the two directions do not interfere with each other, thereby further improving the angle adjustment accuracy of the angular cavity. Moreover, through ingenious structural design, the two adjustment mechanisms share a single lever arm, which simplifies the structure, reduces accumulated errors and deformation, and is beneficial to the structural stability of precision optical instruments such as large laser gyroscopes.

[0031] In this embodiment, the adjustment frame 31 is provided with a first horizontal pull rod 311, the adjustment end 362 of the lever arm 36 is provided with a second horizontal pull rod 363, and the two hook ends of the second tension spring 35 are respectively slidably mounted on the first horizontal pull rod 311 and the second horizontal pull rod 363.

[0032] In this embodiment, the adjustment frame 31 is provided with a first vertical pull rod 312, the adjustment end 362 of the lever arm 36 is provided with a second vertical pull rod 364, and the two hook ends of the first tension spring 34 are respectively slidably mounted on the first vertical pull rod 312 and the second vertical pull rod 364.

[0033] Because the tension spring adjusts its tension according to the extension and retraction of the micrometer, practice has shown that when this device is used for two-dimensional angle adjustment of the angular cavity of a large laser gyroscope, if the tension spring is fixed at both ends using a conventional method, it will not only fail to meet the requirements of tension and stroke, but the axial center line of the tension spring will also twist, leading to instability and jumping. This will not only affect the accuracy and efficiency of the angular cavity angle adjustment, but the vibration generated by the instability and jumping of the tension spring will also easily damage high-precision optical components, causing significant losses.

[0034] This invention designs both ends of the tension spring as slidable free ends, so that the tension spring can adaptively adjust to the appropriate position after the micrometer is extended or retracted, which not only meets the tension requirements, but also avoids the instability problem that occurs when the two ends of the tension spring are fixed.

[0035] In this embodiment, the adjustment structure 3 further includes a first top block 37, which is fixed on the adjustment end 362 of the lever arm 36. The end face of the first top block 37 facing the vertical micrometer 32 is perpendicular to the axis of the vertical micrometer 32. The fixed end of the vertical micrometer 32 is connected to the adjustment frame 31, and the telescopic end of the vertical micrometer 32 abuts against the end face of the first top block 37 facing the vertical micrometer 32.

[0036] In this embodiment, the adjustment structure 3 further includes a second top block 38, which is fixed on the adjustment frame 31. The end face of the second top block 38 facing the horizontal micrometer 33 is perpendicular to the axis of the horizontal micrometer 33. The fixed end of the horizontal micrometer 33 is connected to the adjustment end 362 of the lever arm 36, and the telescopic end of the horizontal micrometer 33 abuts against the end face of the second top block 38 facing the horizontal micrometer 33.

[0037] Therefore, the end face of the top block that contacts the micrometer is designed as a mirror structure perpendicular to the corresponding micrometer, so that no slight vibration will be generated during the adjustment of the micrometer, thereby further improving the angle adjustment accuracy of the corner chamber.

[0038] In this embodiment, the adjusting frame 31 is a U-shaped plate with its opening facing the lever arm 36. The fixed end of the vertical micrometer 32 passes through the upper plate of the U-shaped plate and is fixedly connected to the upper plate. The first horizontal tie rod 311 is fixed to the upper plate of the U-shaped plate by two rod seats 313. The adjusting end 362 of the lever arm 36 is provided with a U-shaped seat and a connecting seat. The end of the connecting seat is provided with an L-shaped groove. The first top block 37 is placed in the L-shaped groove. The telescopic end of the vertical micrometer 32 abuts against the first top block 37. The second horizontal tie rod 363 is fixed between the two side plates of the U-shaped seat.

[0039] The side plate of the adjusting frame 31, corresponding to the telescopic end of the horizontal micrometer 33, is also provided with an extension plate extending toward the horizontal micrometer 33. The second top block 38 is fixed to the extension plate. The fixed end of the horizontal micrometer 33 passes through and is fixed to the adjusting end 362 of the lever arm 36, and its telescopic end abuts against the second top block 38. The first vertical tie rod 312 is fixed to the extension plate by the rod seat 313, and the second vertical tie rod 364 is located at the bottom of the adjusting end 362 of the lever arm 36.

[0040] In this embodiment, the first turntable 21 is rotatably connected to a base plate 24, which is fixed to the worktable 1. The screw 51 passes through the oblong hole 52 and is threadedly connected to the base plate 24. Both ends of the first turntable 21 in the radial direction are provided with bearing seats 25, and the hinge shaft 23 is provided in two sections and is respectively provided at both ends of the second turntable 22. The hinge shaft sections are rotatably connected to the corresponding bearing seats 25.

[0041] In this embodiment, a vertical locking structure 4 is provided between the workbench 1 and the lever arm 36 to lock the vertical position of the lever arm 36.

[0042] In this embodiment, the vertical locking structure 4 includes a limiting micrometer 41 and a limiting seat 42. The limiting seat 42 is fixed on the workbench 1, and the limiting micrometer 41 is disposed on the lever arm 36. The limiting micrometer 41 is arranged perpendicular to the horizontal plane, and its telescopic end is used to abut against the limiting seat 42.

[0043] In this embodiment, a horizontal locking structure 5 is provided between the workbench 1 and the first turntable 21 to lock the horizontal position of the lever arm 36.

[0044] In this embodiment, the horizontal locking structure 5 includes a screw 51 and an oblong hole 52 opened on the first turntable 21. After the screw 51 passes through the oblong hole 52, it is threadedly connected to the base plate 24 on the worktable 1. The screw 51 can be rotated to abut against the first turntable 21 to fix the first turntable 21 and the worktable 1 together.

[0045] To meet the long-term operation requirements of large laser gyroscopes, a vertical locking structure 4 and a horizontal locking structure 5 are designed. When the cavity angle is adjusted to the correct position, the vertical and horizontal positions of the lever arm 36 are locked to prevent accidental contact with the micrometer, which could cause optical path misalignment in the large laser gyroscope.

[0046] Example 2:

[0047] like Figure 6 As shown, this embodiment provides a laser gyroscope world time measurement system, including a ring optical resonant cavity pipe 7, a radio frequency laser 8, and four corner mirror assemblies. The radio frequency laser 8 is disposed on the ring optical resonant cavity pipe 7. The corner mirror assembly includes a corner cavity body 6 and an angle adjustment device as in Embodiment 1. The four corner cavity bodies 6 are respectively disposed at the four corners of the ring optical resonant cavity pipe 7, and the corner cavity bodies 6 are fixed on the second turntable 22 of the corresponding angle adjustment device.

[0048] The embodiments described above are merely preferred embodiments of this utility model. The terms "in one embodiment," "in another embodiment," "in yet another embodiment," or "in still another embodiment" used in this specification all refer to one or more of the same or different embodiments according to this disclosure. Ordinary variations and substitutions made by those skilled in the art within the scope of this utility model's technical solution should be included within the protection scope of this utility model.

Claims

1. A two-dimensional angle adjustment device, characterized in that, It includes a worktable (1), a rotating structure (2), and an adjusting structure (3). The rotating structure (2) includes a first turntable (21) and a second turntable (22). The first turntable (21) is horizontally rotatably connected to the worktable (1), and the second turntable (22) is hinged to the first turntable (21) via a hinge shaft (23). The component to be adjusted is placed on the second turntable (22). The adjustment structure (3) includes an adjustment frame (31), a vertical micrometer (32), a horizontal micrometer (33), a first tension spring (34), a second tension spring (35), and a lever arm (36). The adjustment frame (31) is fixed on the workbench (1). The hinge shaft (23) is arranged horizontally and perpendicular to the lever arm (36). The lever arm (36) includes a connecting end (361) and an adjusting end (362). The connecting end (361) is connected to the second turntable (22). The horizontal micrometer (33) is arranged parallel to the hinge shaft (23). Its fixed end is connected to one of the adjusting end (362) of the lever arm (36) and the adjustment frame (31), and its telescopic end abuts against the other. The vertical micrometer (32) The lever arm (36) is arranged perpendicular to the horizontal plane. Its fixed end is connected to one of the adjustment end (362) of the lever arm (36) and the adjustment frame (31), and its telescopic end is in contact with the other. The first tension spring (34) and the second tension spring (35) are both compressed between the adjustment frame (31) and the adjustment end (362) of the lever arm (36). The first tension spring (34) is used to provide a horizontal tension to the lever arm (36). This horizontal tension is equal in magnitude and opposite in direction to the horizontal force exerted by the horizontal micrometer (33) on the lever arm (36). The second tension spring (35) is used to provide a vertical tension to the lever arm (36). This vertical tension is equal in magnitude and opposite in direction to the vertical force exerted by the vertical micrometer (32) on the lever arm (36).

2. The two-dimensional angle adjustment device according to claim 1, characterized in that, The adjustment frame (31) is provided with a first horizontal pull rod (311), and the adjustment end (362) of the lever arm (36) is provided with a second horizontal pull rod (363). The two hook ends of the second tension spring (35) are respectively slidably mounted on the first horizontal pull rod (311) and the second horizontal pull rod (363).

3. The two-dimensional angle adjustment device according to claim 2, characterized in that, The adjustment frame (31) is provided with a first vertical pull rod (312), and the adjustment end (362) of the lever arm (36) is provided with a second vertical pull rod (364). The two hook ends of the first tension spring (34) are respectively slidably mounted on the first vertical pull rod (312) and the second vertical pull rod (364).

4. The two-dimensional angle adjustment device according to any one of claims 1-3, characterized in that, The adjustment structure (3) also includes a first top block (37), which is fixed on the adjustment end (362) of the lever arm (36). The end face of the first top block (37) facing the vertical micrometer (32) is perpendicular to the axis of the vertical micrometer (32). The fixed end of the vertical micrometer (32) is connected to the adjustment frame (31), and the telescopic end of the vertical micrometer (32) abuts against the end face of the first top block (37) facing the vertical micrometer (32).

5. The two-dimensional angle adjustment device according to any one of claims 1-3, characterized in that, The adjustment structure (3) also includes a second top block (38), which is fixed on the adjustment frame (31). The end face of the second top block (38) facing the horizontal micrometer (33) is perpendicular to the axis of the horizontal micrometer (33). The fixed end of the horizontal micrometer (33) is connected to the adjustment end (362) of the lever arm (36). The telescopic end of the horizontal micrometer (33) abuts against the end face of the second top block (38) facing the horizontal micrometer (33).

6. The two-dimensional angle adjustment device according to any one of claims 1-3, characterized in that, A vertical locking structure (4) is provided between the worktable (1) and the lever arm (36) to lock the vertical position of the lever arm (36).

7. The two-dimensional angle adjustment device according to claim 2, characterized in that, The vertical locking structure (4) includes a limiting micrometer (41) and a limiting seat (42). The limiting seat (42) is fixed on the workbench (1), and the limiting micrometer (41) is set on the lever arm (36). The limiting micrometer (41) is arranged perpendicular to the horizontal plane, and its telescopic end is used to abut against the limiting seat (42).

8. The two-dimensional angle adjustment device according to any one of claims 1-3, characterized in that, A horizontal locking structure (5) is provided between the worktable (1) and the first turntable (21) to lock the horizontal position of the lever arm (36).

9. The two-dimensional angle adjustment device according to claim 8, characterized in that, The horizontal locking structure (5) includes a screw (51) and an oblong hole (52) opened on the first turntable (21). The screw (51) passes through the oblong hole (52) and is threadedly connected to the worktable (1). The screw (51) can be rotated to abut against the first turntable (21) to fix the first turntable (21) and the worktable (1) together.

10. A laser gyroscope world time measurement system, characterized in that, The device includes a ring optical resonant cavity channel (7), a radio frequency laser (8), and four corner mirror assemblies. The radio frequency laser (8) is disposed on the ring optical resonant cavity channel (7). The corner mirror assembly includes a corner cavity body (6) and a two-dimensional angle adjustment device as described in any one of claims 1-9. The four corner cavity bodies (6) are disposed at the four corners of the ring optical resonant cavity channel (7), and the corner cavity bodies (6) are fixed on the second turntable (22) of the corresponding two-dimensional angle adjustment device.

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