Modularized double-shaft optical fiber gyroscope

Abstract

The utility model relates to the technical field of optical fiber sensing, in particular to a modularized double-shaft optical fiber gyroscope which comprises a shell, a plurality of mounting grooves are formed in the side wall of the shell, and the mounting grooves comprise a first mounting groove, a second mounting groove, a third mounting groove and a fourth mounting groove; the first mounting groove is provided with a circuit control mainboard, a coupler and a detector; the second mounting groove is provided with a light source plate and an SLD light source; cylindrical optical fiber ring modules are arranged in the third mounting groove and the fourth mounting groove, and the axes of the two optical fiber ring modules are spatially orthogonal. An optical path and a circuit are separated through multi-mounting-groove modular design, an optical path module and a circuit module are respectively and intensively arranged, physical isolation is arranged between the optical path and the circuit, an optical fiber ring module is provided with a shielding cover, electromagnetic interference can be effectively avoided, and the direct influence of heat on an optical fiber ring is reduced; the optical fiber is subjected to primary coiling in the optical path module and then is subjected to secondary coiling in a specific area of the shell, so that the stability of the gyroscope is improved.

Description

Technical Field

[0001] This utility model relates to the field of fiber optic sensing technology, specifically a modular dual-axis fiber optic gyroscope. Background Technology

[0002] A fiber optic gyroscope is an angular velocity sensor based on the Segnik effect, measuring rotational angular velocity by detecting the phase difference of light propagating backward in an optical fiber coil. Its core structure includes a laser source, an optical fiber coil, and a photodetector. As the system rotates, the clockwise and counterclockwise propagating light produce changes in interference fringes due to the optical path difference, thus calculating the angular displacement. Compared to traditional mechanical gyroscopes, fiber optic gyroscopes are insensitive to vibration, acceleration, and shock; compared to MEMS gyroscopes, they have stronger anti-interference capabilities and are irreplaceable in terms of high precision, long lifespan, and adaptability to extreme environments.

[0003] Typical fiber optic gyroscopes centrally arrange optical components, fiber optic loops, and circuit boards on multiple mounting brackets. This makes it difficult to control a single variable during accuracy testing and is prone to optocoupler interference. If the gyroscope is designed for a small size, the heat generated by the circuit components can directly affect the fiber optic loop, impacting the gyroscope's accuracy. In many designs, the fiber optic loop is directly glued to the main structure, making removal extremely difficult and affecting assembly progress if problems occur. Furthermore, neglecting the coiling of the tail fiber raises concerns about the gyroscope's stability.

[0004] This utility model discloses a modular dual-axis fiber optic gyroscope with a multi-mounting slot modular design, which separates the optical path and the circuit. The optical path module and the circuit module are arranged in a centralized manner. There is physical isolation between the optical path and the circuit and the shielding cover of the fiber optic ring module, which can effectively avoid photoelectric interference and reduce the direct impact of heat on the fiber optic ring. The optical fiber is first wound in the optical path module and then wound a second time in a specific area of ​​the shell, which improves the stability of the gyroscope. Utility Model Content

[0005] To address the problems in the existing technology, this utility model provides a modular dual-axis fiber optic gyroscope.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a modular dual-axis fiber optic gyroscope, including a housing, a top cover, a first side cover, a second side cover, and a third side cover. The housing has a first mounting slot, a second mounting slot, a third mounting slot, and a fourth mounting slot. The first mounting slot is provided with a circuit control main board, a coupler, and a detector. The second mounting slot is provided with a light source board and an SLD light source. The third and fourth mounting slots are provided with cylindrical fiber optic ring modules, and the axes of the two fiber optic ring modules are spatially orthogonal.

[0007] Preferably, the fiber optic ring module includes a ring cover, a ring base, a fiber optic ring, and a Y-waveguide; both the ring cover and the ring base are made of magnetic shielding material, and the fiber optic ring is glued to the ring base with 353ND glue.

[0008] Preferably, the four corners of the first mounting slot are provided with small protrusions of a specific area, and the small protrusions are drilled with threaded holes. Under the premise of not interfering with the components of the circuit control motherboard, the circuit control motherboard is fixed to the small protrusions by screws. The bottom of the slot has a specific rectangular area specifically for coiling the optical fiber pigtail. The corners adopt a large R-angle transition and have a lug structure processed by a T-shaped blade. The lug structure restricts the optical fiber on the bottom surface of the rectangular area. The circuit control motherboard maintains a certain distance from the bottom of the first mounting slot. The detector is directly connected to the circuit control motherboard through pins. The coupler is directly fixed to the bottom of the first mounting slot with adhesive.

[0009] Preferably, the third mounting groove is a U-shaped curved groove machined by a ball end mill. The side of the U-shaped curved groove is provided with threaded holes for fixing and installing the fiber optic ring module. The diameter of the U-shaped curved groove is larger than the outer diameter of the fiber optic ring module, and the distance from the bottom of the curved groove to the inner surface of the second side cover is larger than the diameter of the fiber optic ring module, ensuring that the fiber optic ring module does not interfere with the second side cover. The fiber optic ring module needs to be inserted from the side.

[0010] Preferably, a boss is formed on the inner surface of the side cover, and a threaded hole is drilled on the boss. The SLD light source and the light source board can be fixed to the boss by screws through the threaded hole.

[0011] Preferably, side cover one, side cover two, and side cover three are all fixed to the housing by countersunk screws.

[0012] The beneficial effects of this utility model are:

[0013] The modular dual-axis fiber optic gyroscope described in this utility model separates the optical path and the circuit through a modular design with multiple mounting slots. The optical path module and the circuit module are arranged in a centralized manner, and there is physical isolation between the optical path and the circuit, as well as a shielding cover on the fiber optic ring module, which can effectively avoid electromagnetic interference and reduce the direct impact of heat on the fiber optic ring. The optical fiber is first wound in the optical path module and then wound a second time in a specific area of ​​the shell, which improves the stability of the gyroscope. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is an exploded view of the present invention.

[0016] Figure 2 This is the utility model Figure 1 Rear view of the middle shell

[0017] Figure 3 This is the utility model Figure 1 Top view of the middle shell

[0018] Figure 4 This is the utility model Figure 1 Right view of the middle shell

[0019] Figure 5 This is a view of the fiber optic ring module of this utility model.

[0020] Figure 6 This is a schematic diagram of the overall three-dimensional structure of this utility model.

[0021] In the diagram: 1. Shell; 2. Top cover; 21. Side cover one; 22. Side cover two; 23. Side cover three;

[0022] 31. First mounting slot; 32. Second mounting slot; 33. Third mounting slot; 34. Fourth mounting slot;

[0023] 4. Fiber optic ring module; 41. Ring cover; 42. Ring base;

[0024] 5. Small boss; 6. Threaded hole; 7. Rectangular area; 8. Corner; 9. Ear-block structure; 10. Wiring hole; 11. Curved groove; 12. Boss. Detailed Implementation

[0025] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0026] like Figures 1-6 As shown, a modular dual-axis fiber optic gyroscope of the present invention includes a housing 1. The side wall of the housing 1 is provided with a plurality of mounting slots, including a first mounting slot 31, a second mounting slot 32, a third mounting slot 33 and a fourth mounting slot 34.

[0027] The first mounting slot 31 is equipped with a circuit control main board, a coupler, and a detector; the second mounting slot 32 is equipped with a light source board and an SLD light source; the third mounting slot 33 and the fourth mounting slot 34 are equipped with cylindrical fiber optic ring modules 4, and the axes of the two fiber optic ring modules 4 are spatially orthogonal.

[0028] Specifically, the fiber optic ring module 4 includes a ring cover 41, a ring base 42, a fiber optic ring, and a Y-waveguide. Both the ring cover 41 and the ring base 42 are made of magnetic shielding material. The fiber optic ring is glued to the ring base 42 with 353ND glue. The Y-waveguide can be installed on the reverse side of the ring base 42, and the tail fiber of the fiber optic ring and the Y-waveguide is coiled.

[0029] The fiber optic ring is glued to the front of the ring base 42, and then the ring cover 41 is placed on top and sealed by laser welding. First, it is glued together to fix it, and then laser welding is performed to seal it so that the fiber optic ring can be in a closed environment during the welding process, reducing external influences.

[0030] Specifically, the first mounting slot 31 has small protrusions 5 of a specific area at its four corners. The small protrusions 5 are drilled with threaded holes 6. The circuit control motherboard is fixed to the small protrusions 5 by screws. The bottom of the slot has a specific rectangular area 7 specifically used for coiling optical fiber pigtails. The corner 8 adopts a large R-angle transition and has an ear-block structure 9 processed by a T-shaped knife. The ear-block structure 9 restricts the optical fiber to the bottom surface of the rectangular area 7.

[0031] The circuit control motherboard is more securely fixed with screws to prevent shaking during operation. The ear-block structure 9 restricts the optical fiber to the rectangular area 7.

[0032] Specifically, the circuit control motherboard maintains a certain distance from the bottom of the first mounting slot 31, the detector is directly connected to the circuit control motherboard through pins, and the three couplers are directly fixed to the bottom of the first mounting slot 31 with adhesive.

[0033] The second mounting slot 32 is circular, with a square pit dug at the bottom to avoid interference with the SLD light source. The sides and bottom of the slot have wiring holes 10 of a specific size for connecting the optical path and the circuit.

[0034] The third mounting groove 33 is a curved groove 11 machined by a ball end mill. The diameter of the curved groove 11 is larger than the outer diameter of the fiber optic ring module 4, and the distance from the bottom of the curved groove to the inner surface of the side cover 22 is larger than the diameter of the fiber optic ring module.

[0035] To ensure that the fiber optic ring module 4 does not interfere with the side cover 22, the fiber optic ring module 4 needs to be inserted from the side, and then the screw is inserted vertically through the waist-shaped hole 11 of the first mounting slot 31 and tightened with a screwdriver.

[0036] Specifically, a side cover 21 is provided in the middle of the second mounting groove 32. A boss 12 is provided on the inner surface of the side cover 21. Threaded holes are drilled on the boss 12. The SLD light source and the light source board can be fixed to the boss 12 by connecting the threaded holes with screws.

[0037] Specifically, a second side cover 22 is provided on the outside of the third mounting slot 33, and a third side cover 23 is provided on the outside of the fourth mounting slot 34. The first side cover 21, the second side cover 22, and the third side cover 23 are fixed to the housing 1 by countersunk screws.

[0038] Working principle: The detector is connected to the circuit control main board, the SLD light source is connected to the light source board, the SLD light source pigtail is connected to the input fiber of the 1-to-2 coupler, the output fiber of the 1-to-2 coupler is connected to the input fiber of the 2X2 coupler, the output fiber of the 2X2 coupler is connected to the input fiber of the Y-waveguide, the output fiber of the Y-waveguide is connected to the fiber optic ring, the detector pigtail is connected to the other input fiber of the 2X2 coupler, and the Y-waveguide is connected to the circuit control main board. When the light source board drives the SLD light source to work, the light emitted by the SLD light source passes through the 1-to-2 coupler, the 2X2 coupler, and the Y-waveguide to reach the fiber optic ring, where it propagates. When the fiber rotates around its normal, the propagation paths of the two beams of light generate an optical path difference due to the rotation, resulting in a phase difference, which is further used to calculate the angular velocity.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The descriptions of the above embodiments and specifications are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A modular dual-axis fiber optic gyroscope, comprising a housing (1), characterized in that: The side wall of the housing (1) is provided with a plurality of mounting slots, including a first mounting slot (31), a second mounting slot (32), a third mounting slot (33) and a fourth mounting slot (34). The first mounting slot (31) is equipped with a circuit control main board, a coupler and a detector; the second mounting slot (32) is equipped with a light source board and an SLD light source; the third mounting slot (33) and the fourth mounting slot (34) are equipped with cylindrical fiber optic ring modules (4), and the axes of the two fiber optic ring modules (4) are spatially orthogonal.

2. The modular dual-axis fiber optic gyroscope according to claim 1, characterized in that: The fiber optic ring module (4) includes a ring cover (41), a ring base (42), a fiber optic ring, and a Y-waveguide. Both the ring cover (41) and the ring base (42) are made of magnetic shielding material. The fiber optic ring is glued to the ring base (42). The Y-waveguide can be installed on the reverse side of the ring base (42). The tail fiber of the fiber optic ring and the Y-waveguide is coiled.

3. A modular dual-axis fiber optic gyroscope according to claim 1, characterized in that: The first mounting slot (31) has small protrusions (5) at its four corners. The small protrusions (5) are drilled with threaded holes (6). The circuit control board is fixed to the small protrusions (5) by screws. The bottom of the slot has a rectangular area (7) specifically for coiling optical fiber pigtails. The corner (8) adopts a large R-angle transition and has an ear-block structure (9) made by a T-shaped knife. The ear-block structure (9) restricts the optical fiber to the bottom surface of the rectangular area (7).

4. A modular dual-axis fiber optic gyroscope according to claim 3, characterized in that: The circuit control motherboard maintains a distance from the bottom of the first mounting slot (31). The detector is directly connected to the circuit control motherboard through pins. The three couplers are directly fixed to the bottom of the first mounting slot (31) with adhesive.

5. A modular dual-axis fiber optic gyroscope according to claim 4, characterized in that: The second mounting slot (32) is circular, with a square pit dug at the bottom. Wiring holes (10) are opened on the sides and bottom of the slot for connecting optical and electrical paths.

6. A modular dual-axis fiber optic gyroscope according to claim 4, characterized in that: The third mounting slot (33) is a curved slot (11) machined by a ball end mill. The diameter of the curved slot (11) is greater than the outer diameter of the fiber optic ring module (4), and the distance from the bottom of the curved slot to the inner surface of the second side cover (22) is greater than the diameter of the fiber optic ring module.

7. A modular dual-axis fiber optic gyroscope according to claim 1, characterized in that: The second mounting slot (32) has a side cover (21) in the middle. The inner surface of the side cover (21) has a boss (12) with a threaded hole drilled on it. The SLD light source and the light source board can be fixed on the boss (12) by connecting the threaded hole with screws.

8. A modular dual-axis fiber optic gyroscope according to claim 7, characterized in that: Side cover 2 (22) is provided on the outside of the third mounting groove (33), and side cover 3 (23) is provided on the outside of the fourth mounting groove (34). Side cover 1 (21), side cover 2 (22) and side cover 3 (23) are fixed to the housing (1) by countersunk nails.

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