Laser gyroscope combined mechanical dithering device

Abstract

The utility model relates to the technical field of laser gyroscopes, in particular to a laser gyroscope combined mechanical dithering device, which comprises a triangular pedestal for bearing a laser gyroscope resonant cavity and a dithering wheel for mechanical offset frequency input, first fixing holes used for fixing a laser gyroscope resonant cavity are formed in the three faces of the triangular pedestal respectively, a second fixing hole is vertically formed in the center of the triangular pedestal in a penetrating mode, a telescopic sleeve is movably arranged in the first fixing hole, and a vertically-penetrating inserting groove is formed in the end of the telescopic sleeve. According to the utility model, through the arrangement of the telescopic sleeve, the resonant cavities of the laser gyroscopes can be linked with each other and fixed on the first fixing hole, so that the consistency is kept in the process of high-precision control on the amplitude and frequency of tiny jitter; the problem of poor frequency caused by different fixing effects of screws on any first fixing hole can be avoided, and the measurement performance and reliability of the laser gyroscope system are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of laser gyroscopes, in particular to a laser gyroscope combined mechanical shaking device. Background Art

[0002] A laser gyro is a high-precision inertial navigation instrument that uses the principle of light wave interference to sense angular velocity signals. It is widely used in inertial navigation systems in aerospace, marine, and automotive applications. Its core operating principle is to sense rotational velocity based on the frequency difference of light waves in a ring laser cavity. It features zero mechanical wear, a long lifespan, and high reliability. However, in actual use, laser gyro systems can be affected by mechanical noise, thermal noise, and environmental interference, resulting in reduced measurement accuracy.

[0003] Mechanical dithering is an important means of improving the measurement sensitivity of laser gyroscopes. By introducing controlled, micro-vibrations into the laser gyroscope structure, it effectively suppresses the mode-locking effect, a phenomenon in which the laser beam frequency difference becomes locked when the angular velocity approaches zero. Mechanical dithering introduces a periodic offset signal to dynamically vary the frequency difference, thereby preventing interference from mode-locking on the signal. Conventional laser gyroscopes consist of three gyroscopes in a system, sharing a dither wheel as the input for mechanical bias frequency. The symmetry and dynamic balance of the dither wheel affect gyroscope performance indicators such as zero bias and drift.

[0004] However, the existing mechanical dithering device needs to be equipped with a corresponding mechanical dithering unit in each cavity itself, which not only adds a cumbersome mechanical structure and control unit, but also increases the volume and weight of the system, and increases the production cost. To this end, in a laser gyroscope combined umbrella-shaped split mechanical dithering device with application number CN201920942082.X, a combined umbrella-shaped mechanical dithering device is provided to achieve the effects of reducing volume, improving accuracy and optimizing wiring. However, the components used to fix the laser gyroscope resonant cavity are independent of each other, and their performance is limited in high-precision control of small dither amplitude and frequency, especially in complex vibration environments, where consistency and stability are difficult to achieve. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a laser gyroscope combined mechanical shaking device.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present utility model is as follows:

[0007] A laser gyroscope combined mechanical dithering device, comprising a triangular pedestal supporting a laser gyroscope resonant cavity and a dithering wheel for mechanical frequency offset input; the triangular pedestal being a columnar structure with a triangular cross-section; first fixing holes for fixing the laser gyroscope resonant cavity being provided on three sides of the triangular pedestal; a second fixing hole being provided vertically through the center of the triangular pedestal; the first fixing hole being connected to the axis of the triangular pedestal and communicating with the second fixing hole; the three first fixing holes being arranged in a staggered manner in the vertical direction; a telescopic sleeve being movably provided in the first fixing hole; a vertically extending slot being provided at the end of the telescopic sleeve; the slot being the same size as the second fixing hole;

[0008] The dither wheel is provided with three third fixing holes, evenly spaced around the circumference, for securing the dither wheel to an external system structure. A dither transmission rod is connected to each of the third fixing holes along the center of the circle. A fourth fixing hole, coaxial with the second fixing hole, is provided at the intersection of the three dither transmission rods. The external system structure cooperates with the third fixing holes of the dither wheel to transmit the driving force to the dither wheel, thereby achieving the input of periodic mechanical offset frequency dithering. The dither transmission rod is connected to the third fixing hole along the center of the circle and to the fourth fixing hole at its end, enabling the transmission of driving force from the external system structure to the triangular pedestal. Because the three dither transmission rods are evenly spaced around the circumference, they can evenly transmit the force generated by the dither wheel to the three corners of the bottom of the triangular pedestal, thereby reducing the interference of unbalanced torque on system operation and maintaining the symmetry and consistency of the dithering. A fourth fixing hole is provided at the intersection of the three dither transmission rods, coaxially connected to the second fixing hole, ensuring that the central transfer point of the dither wheel is coaxial with the center point of the triangular pedestal, thereby achieving precise mechanical coupling and providing a precise geometric reference for dither monitoring in the feedback part.

[0009] Furthermore, a first retaining ring is provided on the outer wall of the telescopic sleeve at the end away from the second fixing hole, and a second retaining ring is provided on the inner wall of the end of the first fixing hole near the second fixing hole. The central portion is the feedback section, and the outer portion corresponding to the vibration wheel is the vibration drive section. Piezoelectric ceramics with corresponding characteristics are bonded to the corresponding sections.

[0010] Furthermore, an elastic component is provided between the first limiting ring and the second limiting ring. After the laser gyro resonant cavity is fitted into the first fixing hole, the laser gyro resonant cavity is fixed by an external screw. The outer diameter of the external screw matches the screw hole of the first fixing hole. After insertion, the telescopic sleeve fitted into the first fixing hole can be pushed. After the screw is fully inserted, the telescopic sleeve reaches the limit pushing distance, at which time the slot is coaxial with the second fixing hole. After the three laser gyro resonant cavities are fixed by screws, a fixing bolt is inserted into the second fixing hole to ensure that the three laser gyro resonant cavities reach the same fixing depth, thereby ensuring consistency in the process of high-precision control of small jitter amplitude and frequency.

[0011] Furthermore, the diameter of the elastic component is larger than the outer diameter of the telescopic sleeve and smaller than the inner diameter of the first fixing hole. After the test is completed, the screw is removed, and the laser gyro resonator can also be removed. After removal, the elastic component recovers its elastic deformation, allowing the telescopic sleeve to reenter the first fixing hole and be used for the next test.

[0012] Furthermore, the inner cavity of the triangular pedestal is provided with an accommodating cavity on the horizontal extension line of the first fixing hole. When fixing the laser gyroscope resonant cavity, a screw needs to be inserted. At this time, the screw pushes the telescopic sleeve toward the cavity corresponding to the second fixing hole. Because the slot is located at the end of the telescopic sleeve, its outer end has a certain length. At this time, when the slot is aligned with the second fixing hole, the outer end is long enough to just fit into the accommodating cavity.

[0013] Furthermore, a screw hole is formed on the inner wall of the first fixing hole, and each of the first fixing holes is fixed with a screw through the screw hole. The laser gyroscope resonant cavity can be tightened and fixed by the screw.

[0014] Furthermore, the three corners of the bottom surface of the triangular pedestal are each provided with a first threaded hole, and the vibration transmission rod is provided with a second threaded hole corresponding to the first threaded hole. The first and second threaded holes are connected by screws, securing the vibration transmission rod to the three corners of the bottom of the triangular pedestal. This ensures the reliability of the vibration transmission rod and the triangular pedestal, while also enabling convenient assembly and disassembly, facilitating subsequent maintenance or component replacement.

[0015] Furthermore, each first threaded hole is fixed with a second threaded hole by a screw. The vibration transmission rod evenly transmits the periodic driving force generated by the vibration wheel to the three corners of the triangular pedestal. The first threaded holes are distributed at the three corners of the equilateral triangle on the bottom surface of the triangular pedestal, corresponding to the positions of the second threaded holes, ensuring the symmetry and stability of the driving force transmission path. The three-point support design structure evenly distributes the driving force at the bottom of the triangular pedestal, effectively reducing single-point stress concentration and avoiding structural deformation or vibration deviation caused by uneven torque.

[0016] Furthermore, the second fixing holes are adapted to receive bolts for securing the tripod and the dither wheel. After the three laser gyro resonators are secured, the three slots are located on and coaxial with the second fixing holes. Bolts are inserted through the three slots and connected to the fourth fixing holes to secure the tripod and dither wheel.

[0017] Furthermore, the cross section of the triangular pedestal is an equilateral triangle. During the vibration transmission process, the cross section of the equilateral triangle can effectively balance the vibration force and avoid torque deviation caused by the asymmetric shape.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The utility model provides a telescopic sleeve to fix the laser gyro resonant cavities to the first fixing hole in a linked manner, ensuring consistency during high-precision control of micro-jitter amplitude and frequency;

[0020] 2. The utility model can avoid the problem of frequency difference caused by the difference in the fixing effect of the screws on any first fixing hole, thereby improving the measurement performance and reliability of the laser gyro system;

[0021] 3. The utility model reduces unnecessary additional interference, and the split design of the tripod base and the shaking wheel stand can reduce the inconvenience caused by maintenance and replacement, meeting the needs of the high-precision inertial navigation field. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of the utility model;

[0023] Figure 2 This is a schematic diagram of the split structure of the utility model;

[0024] Figure 3 It is a schematic diagram of the partial structure of the first fixing hole and the telescopic sleeve;

[0025] Figure 4 Schematic diagram of the split structure of the first fixing hole and the telescopic sleeve;

[0026] Figure 5 is a schematic diagram of the planar structure of the first fixing hole and the telescopic sleeve;

[0027] Figure identification: 1-triangular base, 2-shaking wheel, 3-first fixing hole, 4-second fixing hole, 5-telescopic sleeve, 6-slot, 7-third fixing hole, 8-shaking transmission rod, 9-fourth fixing hole, 10-first limiting ring, 11-second limiting ring, 12-elastic component, 13-screw hole, 14-first threaded hole, 15-second threaded hole. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The schematic implementation methods of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0029] Example 1, as Figure 1-5As shown, the utility model discloses a laser gyroscope combined mechanical dithering device, including a triangular pedestal 1 carrying a laser gyroscope resonant cavity and a dithering wheel 2 for mechanical frequency deviation input, wherein the triangular pedestal 1 is a columnar structure with a triangular cross-section, and three sides of the triangular pedestal 1 are respectively provided with first fixing holes 3 for fixing the laser gyroscope resonant cavity, and a second fixing hole 4 is vertically penetrated in the center of the triangular pedestal 1, the first fixing hole 3 is connected to the axis of the triangular pedestal 1 and is connected to the second fixing hole 4, and the three first fixing holes 3 are staggered in the vertical direction, and a telescopic sleeve 5 is movably provided in the first fixing hole 3, and a vertically penetrating slot 6 is provided at the end of the telescopic sleeve 5, and the slot 6 has the same size as the second fixing hole 4.

[0030] The shaking wheel 2 is provided with three third fixing holes 7 for fixing the shaking wheel 2 to the external system structure at equal intervals in the circumferential direction. The third fixing hole 7 is connected to a shaking transmission rod 8 along the center direction of the circle, and a fourth fixing hole 9 coaxial with the second fixing hole 4 is provided at the intersection of the three shaking transmission rods 8. Specifically, the central part is the feedback part, and the outer side corresponding to the shaking wheel 2 is the shaking drive part, and the corresponding part is bonded with piezoelectric ceramics with corresponding characteristics. The external system structure integrates a shaking driver or other power source, and transmits the driving force to the shaking wheel 2 by cooperating with the third fixing hole 7 of the shaking wheel 2, thereby realizing the input of periodic mechanical offset frequency shaking. The shaking transmission rod 8 is connected to the third fixing hole 7 along the center direction of the circle, and is connected to the fourth fixing hole 9 through its end, so as to realize the transmission of driving force from the external system structure to the triangular pedestal 1. Since the three vibration transmission rods 8 are arranged at equal intervals around the circumference, they can evenly transmit the force generated by the vibration wheel 2 to the three corners at the bottom of the triangular base 1 (the position of the first threaded hole 14), thereby reducing the interference of the unbalanced torque on the operation of the system and maintaining the symmetry and consistency of the vibration. A fourth fixing hole 9 is provided at the intersection of the three vibration transmission rods 8, which is coaxially connected to the second fixing hole 4 to ensure that the center transfer point of the vibration wheel 2 is coaxial with the center point of the triangular base 1, thereby achieving precise mechanical coupling and providing a precise geometric reference for the vibration monitoring of the feedback part. In addition, the vibration transmission rod 8 has a certain degree of elasticity or design redundancy, which can adapt to the slight structural deformation that occurs during dynamic vibration and prevent damage or performance degradation caused by excessive stress concentration.

[0031] A first limiting ring 10 is provided on the outer wall of the telescopic sleeve 5 at one end away from the second fixing hole 4 , and a second limiting ring 11 is provided on the inner wall of the first fixing hole 3 at one end close to the second fixing hole 4 .

[0032] An elastic component 12 is provided between the first limiting ring 10 and the second limiting ring 11. Specifically, after the laser gyro resonant cavity is sleeved with the first fixing hole 3, the laser gyro resonant cavity is fixed by an external screw. The outer diameter of the external screw matches the screw hole of the first fixing hole 3. After insertion, the telescopic sleeve 5 sleeved with the first fixing hole 3 can be pushed. After the screw is fully inserted, the telescopic sleeve 5 reaches the limit pushing distance, at which time the slot 6 is coaxial with the second fixing hole 4. After the three laser gyro resonant cavities are fixed by screws, a fixing bolt is inserted into the second fixing hole 4 to ensure that the three laser gyro resonant cavities reach the same fixing depth, thereby ensuring consistency in the process of high-precision control of small jitter amplitude and frequency.

[0033] The diameter of the elastic component 12 is larger than the outer diameter of the telescopic sleeve 5 and smaller than the inner diameter of the first fixing hole 3. Specifically, after the test is completed, the screw is removed, and the laser gyro resonator is also removed. After removal, the elastic component 12 recovers its elastic deformation, allowing the telescopic sleeve 5 to reenter the first fixing hole 3, ready for the next test.

[0034] The inner cavity of the triangular pedestal 1 is provided with an accommodating cavity on the horizontal extension line of the first fixing hole 3. Specifically, when fixing the laser gyro resonant cavity, a screw needs to be inserted. At this time, the screw pushes the telescopic sleeve 5 close to the cavity corresponding to the second fixing hole 4. Because the slot 6 is located at the end of the telescopic sleeve 5, its outer end has a certain length. At this time, when the slot 6 is aligned with the second fixing hole 4, the outer end is long enough to just fit into the accommodating cavity.

[0035] The inner wall of the first fixing hole 3 is provided with a screw hole 13, and each of the first fixing holes 3 is fixed to the laser gyro resonant cavity by a screw cooperating with the screw hole 13. Specifically, the laser gyro resonant cavity can be tightened and fixed by the screw.

[0036] The three corners of the bottom surface of the triangular pedestal 1 are each provided with a first threaded hole 14, and the vibration transmission rod 8 is provided with a second threaded hole 15 corresponding to the first threaded hole 14. Specifically, the first threaded holes 14 and the second threaded holes 15 are connected by screws, securing the vibration transmission rod 8 to the three corners of the bottom of the triangular pedestal 1. This ensures the reliability of the vibration transmission rod 8 and the triangular pedestal 1, while also enabling convenient assembly and disassembly, facilitating subsequent maintenance or component replacement.

[0037] Each first threaded hole 14 is secured to the second threaded hole 15 by a screw. Specifically, the vibration transmission rod 8 evenly transmits the periodic driving force generated by the vibration wheel 2 to the three corners of the triangular pedestal 1. The first threaded holes 14 are distributed at the three corners of the equilateral triangle on the bottom surface of the triangular pedestal 1, corresponding to the positions of the second threaded holes 15, ensuring the symmetry and stability of the driving force transmission path. The three-point support design structure evenly distributes the driving force at the bottom of the triangular pedestal 1, effectively reducing single-point stress concentration and avoiding structural deformation or vibration deviation caused by uneven torque.

[0038] The second fixing holes 4 are adapted to receive bolts for securing the tripod pedestal 1 and the jitter wheel 2. Specifically, after the three laser gyro resonator cavities are secured, the three slots 6 are located on and coaxial with the second fixing holes 4. Bolts are inserted into the three slots 6 and secured to the fourth fixing holes 9, completing the securing of the tripod pedestal 1 and the jitter wheel 2.

[0039] The cross section of the triangular pedestal 1 is an equilateral triangle. Specifically, during the vibration transmission process, the cross section of the equilateral triangle can effectively balance the vibration force and avoid torque deviation caused by the asymmetric shape.

[0040] Embodiment 2: Based on embodiment 1, this embodiment proposes a specific working principle of a laser gyro combined mechanical shaking device.

[0041] The specific implementation principle process is as follows:

[0042] Align the laser gyro resonator with the first fixing hole 3 on the tripod 1, ensuring that its central axis aligns with the axis of the first fixing hole 3. Using screws that match the screw holes 13 in the first fixing hole 3, gradually secure the laser gyro resonator. As the screws are tightened, the outer diameter of the screws pushes the telescopic sleeve 5 toward the second fixing hole 4. As the screws are fully inserted, the end slots 6 of the telescopic sleeve 5 gradually align coaxially with the second fixing hole 4. Follow the above steps to sequentially install the laser gyro resonators in the three first fixing holes 3 of the tripod 1, ensuring consistent installation positions and fixing depths. Align the first threaded holes 14 at the three corners of the bottom surface of the tripod 1 with the second threaded holes 15 on the vibration transmission rod 8. Use screws to mate the first threaded holes 14 with the second threaded holes 15, securing the vibration transmission rod 8 firmly to the bottom of the tripod 1. After the laser gyro resonator is installed, insert the central fixing bolt into the second fixing hole 4. The bolt passes through the slots 6 and connects to the fourth fixing hole 9, where it is secured. Ensure that the triangular base 1 and the shaking wheel 2 are firmly connected and remain coaxial.

[0043] Next, connect the external system's dither driver to the piezoelectric ceramic portion of dither wheel 2 to ensure proper circuit connection. Set the dither driver's frequency, amplitude, and other parameters to ensure they meet the laser gyro's bias input requirements. Start the driver and test the dither wheel's operating status to confirm that periodic mechanical dither is being input properly. Monitor the frequency and amplitude of the dither input through the feedback unit in the center. Verify that the center transfer point of dither wheel 2 is coaxial with the center point of tripod pedestal 1 to ensure dither consistency.

[0044] Of course, the present invention may have many other implementation methods. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A laser gyro combined mechanical dithering device, characterized in that: The invention comprises a triangular pedestal (1) for carrying a laser gyroscope resonant cavity and a shaking wheel (2) for mechanical frequency deviation input, wherein the triangular pedestal (1) is a columnar structure with a triangular cross section, and three sides of the triangular pedestal (1) are respectively provided with first fixing holes (3) for fixing the laser gyroscope resonant cavity, and a second fixing hole (4) is vertically penetrated in the center of the triangular pedestal (1), wherein the first fixing hole (3) is connected to the axis of the triangular pedestal (1) and is communicated with the second fixing hole (4), and the three first fixing holes (3) are staggered in the vertical direction, and a telescopic sleeve (5) is movably provided in the first fixing hole (3), and a vertically penetrated slot (6) is provided at the end of the telescopic sleeve (5), and the slot (6) has the same size as the second fixing hole (4); The shaking wheel (2) is provided with three third fixing holes (7) at equal intervals in the circumferential direction for fixing the shaking wheel (2) to the external system structure. The third fixing holes (7) are connected to the shaking transmission rods (8) along the center direction of the circle. A fourth fixing hole (9) coaxial with the second fixing hole (4) is provided at the intersection of the three shaking transmission rods (8).

2. The laser gyro combined mechanical dithering device according to claim 1, characterized in that: A first limiting ring (10) is provided on the outer wall of one end of the telescopic sleeve (5) away from the second fixing hole (4), and a second limiting ring (11) is provided on the inner wall of one end of the first fixing hole (3) close to the second fixing hole (4).

3. The laser gyro combined mechanical dithering device according to claim 2, characterized in that: An elastic component (12) is provided between the first limiting ring (10) and the second limiting ring (11).

4. The laser gyro combined mechanical dithering device according to claim 3, characterized in that: The diameter of the elastic component (12) is larger than the outer diameter of the telescopic sleeve (5) and smaller than the inner diameter of the first fixing hole (3).

5. The laser gyro combined mechanical dithering device according to claim 1, characterized in that: The inner cavity of the triangular pedestal (1) is provided with an accommodating cavity on the horizontal extension line of the first fixing hole (3).

6. The laser gyro combined mechanical shaking device according to claim 1, characterized in that: A screw hole (13) is provided on the inner wall of the first fixing hole (3), and each of the first fixing holes (3) is used to fix the laser gyro resonant cavity by means of a screw in cooperation with the screw hole (13).

7. The laser gyro combined mechanical shaking device according to claim 1, characterized in that: The three corners of the bottom surface of the triangular pedestal (1) are each provided with a first threaded hole (14), and the vibration transmission rod (8) is provided with a second threaded hole (15) corresponding to the first threaded hole (14).

8. The laser gyro combined mechanical shaking device according to claim 7, characterized in that: Each first threaded hole (14) is fixed in cooperation with the second threaded hole (15) by a screw.

9. The laser gyro combined mechanical shaking device according to claim 1, characterized in that: The second fixing hole (4) is adapted to be inserted with a bolt for fixing the tripod base (1) and the shaking wheel (2).

10. The laser gyro combined mechanical shaking device according to claim 1, characterized in that: The cross section of the triangular pedestal (1) is an equilateral triangle.

Images