Fiber-optic gyroscope IMU (Inertial Measurement Unit) structure

Abstract

The utility model relates to the technical field of fiber-optic gyroscope IMU (Inertial Measurement Unit), in particular to a fiber-optic gyroscope IMU structure which comprises a shell, and a plurality of mounting grooves are formed in the side wall of the shell; the mounting grooves in the side wall of the shell comprise an upper mounting groove, a rear mounting groove, a left mounting groove and a lower mounting groove, the left mounting groove, the rear mounting groove and the lower mounting groove are each provided with an optical fiber assembly, and the axes of the optical fiber assemblies are spatially orthogonal in pairs; a mounting boss is arranged in the upper mounting groove and used for mounting the navigation plate, a triaxial accelerometer, a storage module and a temperature sensor are mounted in the upper mounting groove, and a certain distance is kept between the upper mounting groove and the bottom surface of the navigation plate, so that interference is avoided. A common square structural design is adopted, so that production, processing and manufacturing are facilitated; the layout of electronic components and optical devices is very reasonable, for example, the upper mounting groove is mainly provided with related structures such as an accelerometer, the lower mounting groove is mainly provided with related structures such as a fiber-optic gyroscope, and a light source is arranged in an independent cavity, so that electromagnetic interference isolation and heat source isolation are realized.

Description

Technical Field

[0001] This utility model relates to the field of fiber optic gyroscope IMU technology, and in particular to a fiber optic gyroscope IMU structure. Background Technology

[0002] An inertial measurement unit (IMU) is a device that measures an object's three-axis attitude angles (or angular rates) and acceleration. Gyroscopes and accelerometers are the main components of an IMU. Typically, an IMU contains three single-axis gyroscopes and three single-axis accelerometers. The gyroscopes detect the angular velocity signal of the carrier relative to the navigation coordinate system, while the accelerometers detect the acceleration signal of the object along three independent axes within the carrier's coordinate system. By measuring the object's angular velocity and acceleration in three-dimensional space, the object's attitude can be calculated.

[0003] The accuracy of a fiber optic gyroscope IMU is affected by the combined accuracy of the fiber optic gyroscope and the accelerometer. The presence of multiple influencing factors is not conducive to troubleshooting and consistent production in experiments.

[0004] The fiber optic gyroscope-related structural modules of this utility model have been tested and verified multiple times, and the technology is relatively mature. Based on this, a three-axis accelerometer and other related structural modules have been added, thus realizing the design of a fiber optic gyroscope IMU structure. Similar to most fiber optic gyroscope IMU structures, this utility model's fiber optic gyroscope IMU structure still adopts a square design. Unlike irregular designs, the simple square design is easy to process and manufacture, has good assembly, and good experimental stability. By using mature fiber optic gyroscope technology and a stable external structural design, the influence factors of fiber optic gyroscope technology and structural design are eliminated, thereby limiting the accuracy-influencing factors to the accelerometer-related modules, which is beneficial for experiments and troubleshooting. Utility Model Content

[0005] To address the problems in the existing technology, this utility model provides a fiber optic gyroscope IMU structure.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a fiber optic gyroscope IMU structure, including a housing, and multiple mounting slots are provided on the side wall of the housing;

[0007] The mounting slots on the sidewall of the housing include an upper mounting slot, a rear mounting slot, a left mounting slot, and a lower mounting slot. Each of the left mounting slot, the rear mounting slot, and the lower mounting slot holds an optical fiber assembly, and the axes of the optical fiber assemblies are spatially orthogonal to each other.

[0008] The upper mounting slot is equipped with a mounting boss for mounting the navigation board. The upper mounting slot also houses a triaxial accelerometer, a storage module, and a temperature sensor, and maintains a certain distance from the bottom surface of the navigation board to ensure no interference.

[0009] Preferably, the mounting slot of the housing further includes a front mounting slot, in which a power board is installed, and a heat dissipation cover for heat dissipation is provided on the outside of the power board.

[0010] Preferably, an electrical connector socket and two modulation antennas are installed on one side wall of the front mounting slot.

[0011] Preferably, the lower mounting groove of the housing is provided with a mounting boss for mounting a signal acquisition and processing circuit board, and the detector is connected to the signal acquisition and processing circuit board through pins.

[0012] Preferably, a side cover three is provided on the outside of the right mounting slot, and the light source, the one-to-three coupler and the light source board are installed on the inner wall of the side cover three.

[0013] Preferably, the optical fiber assembly includes a ring cap, an optical fiber ring and a ring base, a coupler and a Y-wave conductor, a cavity is formed between the ring base and the ring cap, the optical fiber ring is disposed in the cavity, and the coupler and the Y-wave conductor are connected to the ring base, wherein the ring cap and the ring base are made of soft magnetic alloy material.

[0014] Preferably, the front mounting slot and the upper mounting slot are provided with through holes for power cables, and the right mounting slot and the lower mounting slot are provided with through holes for light sources, the tail optical fibers of the 1-to-3 coupler, and the connection lines of the light source board and the signal acquisition and processing circuit board.

[0015] Preferably, the left mounting slot and the rear mounting slot are naturally connected to the lower mounting slot to carry the optical fiber and Y-wave conductor at the tail of the coupler. A through hole is provided between the upper mounting slot and the lower mounting slot to carry the connection line between the signal acquisition and processing circuit board and the navigation board.

[0016] Preferably, the fiber optic assembly, triaxial accelerometer, storage module, navigation board, temperature sensor, light source board, power supply board, and electrical connector socket are all connected to the signal acquisition and processing circuit board.

[0017] The beneficial effects of this utility model are:

[0018] The fiber optic gyroscope IMU structure described in this utility model is an improvement on the existing high-precision fiber optic gyroscope structure. Therefore, the influencing factors are limited to the accelerometer-related structures, making it easier to troubleshoot. It adopts a common square structure design, which is beneficial for production and manufacturing. The layout of various electronic components and optical devices is very reasonable. The upper mounting slot is mainly used for accelerometer-related structures, while the lower mounting slot is mainly used for fiber optic gyroscope-related structures. The light source is in a separate chamber, achieving electromagnetic interference isolation and heat source isolation. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1Exploded view of this utility model

[0021] Figure 2 This is a schematic diagram of the assembly of the power board and heat sink of this utility model.

[0022] Figure 3 This is a schematic diagram of the fiber optic assembly of the present invention.

[0023] Figure 4 , Figure 5 These are shell views of the present invention from different angles.

[0024] Figure 6 The diagram below shows the installation of the one-to-three coupler of this utility model.

[0025] In the diagram: 1. Housing; 2. Top cover; 3. Navigation board; 4. Temperature sensor; 5. Triaxial accelerometer; 6. Storage module; 7. Bottom cover; 9. Signal acquisition and processing circuit board;

[0026] 10. Detector; 11. Side cover one; 12. Side cover two; 13. Heat dissipation cover; 14. Modulation antenna; 15. Electrical connector socket; 16. Side cover three; 17. Light source; 18. Light source board; 19. Power supply board;

[0027] 20. Front mounting slot; 21. Upper mounting slot; 22. Right mounting slot; 23. Rear mounting slot; 24. Left mounting slot; 25. Lower mounting slot; 26. 1-to-3 coupler;

[0028] 8. Fiber optic assembly; 801. Ring cap; 802. Fiber optic ring; 803. Ring base; 804. 2x2 coupler; 805. Y waveguide. Detailed Implementation

[0029] 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.

[0030] like Figures 1-6 As shown, a fiber optic gyroscope IMU structure of the present invention includes a housing, and the side wall of the housing 1 is provided with a plurality of mounting slots;

[0031] The mounting grooves on the side wall of the housing 1 include an upper mounting groove 21, a rear mounting groove 23, a left mounting groove 24, and a lower mounting groove 25, wherein the left mounting groove 24, the rear mounting groove 23, and the lower mounting groove 25 are each equipped with an optical fiber assembly 8, and the axes of the optical fiber assemblies 8 are spatially orthogonal to each other.

[0032] The upper mounting slot 21 is provided with a mounting boss for mounting the navigation board 3. The upper mounting slot 21 is equipped with a triaxial accelerometer 5, a storage module 6, and a temperature sensor 4, and maintains a certain distance from the bottom surface of the navigation board 3 to ensure that there is no interference.

[0033] The space of housing 1 can be fully utilized by setting the mounting slot. The fiber optic ring 802 in the fiber optic assembly 8 uses polarization-maintaining fiber. The triaxial accelerometer 5 is a sensor that can detect the acceleration changes of an object in three spatial dimensions. The storage module 6 is a physical part of the computer system used to store data. Its function is to save and read data, and ensure the security and accessibility of the data. The temperature sensor 4 is a sensor that can sense temperature and convert it into a usable output signal.

[0034] The top cover 2, side cover 11, and side cover 2 12 can seal the corresponding grooves, reducing the entry of dust during use.

[0035] As a technical optimization of the present invention, the mounting slot of the housing 1 further includes a front mounting slot 20, in which a power board 19 is installed, and a heat dissipation cover 13 for heat dissipation is provided on the outside of the power board 19.

[0036] To improve heat dissipation efficiency, the power board 19, which generates the most heat, is placed inside the heat sink 13 after proper insulation, allowing heat to dissipate as quickly as possible and ensuring that the operating temperature of the power board 19 does not become too high.

[0037] As a technical optimization of the present invention, an electrical connector socket 15 and two modulation antennas 14 are installed on one side wall of the front mounting slot 20;

[0038] The lower mounting groove 25 of the housing 1 is provided with a mounting boss for mounting the signal acquisition and processing circuit board 9. The detector 10 is connected to the signal acquisition and processing circuit board 9 through pins.

[0039] The lower mounting slot 25 is a large waist-shaped space for the pigtails of the disc detector 10 and the 2x2 coupler 804, and the transition R angle is greater than the bending radius of the optical fiber (generally not less than 5-10mm) to keep the optical fiber in good stretch.

[0040] As a technical optimization of the present invention, a side cover 16 is provided on the outer side of the right mounting groove 22; the light source 17, the one-to-three coupler 26 and the light source plate 18 are installed on the inner wall of the side cover 16.

[0041] The light source 17 can be fixed and powered by the light source board 18. The 1-to-3 coupler has high signal transmission stability and can ensure the stability and consistency of the output signal.

[0042] As a technical optimization of the present invention, the optical fiber assembly 8 includes a ring cover 801 and a ring base 803, a coupler 804 and a Y-wave conductor 805. A cavity is formed between the ring base 803 and the ring cover 801, and an optical fiber ring 802 is disposed in the cavity. The coupler 804 and the Y-wave conductor 805 are connected to the ring base 803. The ring cover 801 and the ring base 803 are made of soft magnetic alloy material.

[0043] The fiber optic assembly 8 has an inner diameter of 22mm, an outer diameter of 36mm, and a height of 7.5mm. The ring cover 801 and the ring base 803 are made of 1J85 soft magnetic alloy material, which can shield the magnetic field from affecting the gyroscope.

[0044] As a technical optimization of the present invention, the front mounting slot 20 and the upper mounting slot 21 are provided with through holes for running power lines, and the right mounting slot 22 and the lower mounting slot 25 are provided with through holes for running the connection lines of the light source 17, the one-to-three coupler 26, the light source board 18, and the signal acquisition and processing circuit board 9.

[0045] The signal acquisition and processing circuit board 9 is a circuit board that integrates signal acquisition, conversion and processing functions, and can monitor and acquire data such as temperature inside the housing 1 in real time.

[0046] As a technical optimization of the present invention, the left mounting slot 24 and the rear mounting slot 23 are naturally connected to the lower mounting slot 25 respectively, for carrying the coupler 804 and the Y-wave conductor 805. A through hole is provided between the upper mounting slot 21 and the lower mounting slot 25 for carrying the connection line between the signal acquisition and processing circuit board 9 and the navigation board 3.

[0047] The left mounting slot 24 and the rear mounting slot 23 are naturally connected to the lower mounting slot 25, which is conducive to the installation of internal components and the connection of circuits, making the space utilization more reasonable.

[0048] As a technical optimization of the present invention, the fiber optic assembly 8, the triaxial accelerometer 5, the storage module 6, the navigation board 3, the temperature sensor 4, the light source board 18, the power supply board 19, and the electrical connector socket 15 are all connected to the signal acquisition and processing circuit board 9.

[0049] The signal acquisition and processing circuit board 9 is used for information acquisition, including temperature data, stored data, data from the light source board 18, etc.

[0050] 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 fiber optic gyroscope IMU structure, comprising a housing (1), characterized in that: The side wall of the housing (1) is provided with multiple mounting slots; The mounting slots on the side wall of the housing (1) include an upper mounting slot (21), a right mounting slot (22), a rear mounting slot (23), a left mounting slot (24), and a lower mounting slot (25), wherein the left mounting slot (24), the rear mounting slot (23), and the lower mounting slot (25) are each equipped with an optical fiber assembly (8), and the axes of the optical fiber assemblies (8) are spatially orthogonal to each other. The upper mounting slot (21) is provided with a mounting boss for mounting the navigation board (3). The upper mounting slot (21) is equipped with a triaxial accelerometer (5), a storage module (6) and a temperature sensor (4), and maintains a certain distance from the bottom surface of the navigation board (3) to ensure that there is no interference.

2. The fiber optic gyroscope IMU structure according to claim 1, characterized in that: The mounting slot of the housing (1) also includes a front mounting slot (20), in which a power board (19) is installed, and a heat dissipation cover (13) for heat dissipation is provided on the outside of the power board (19).

3. The fiber optic gyroscope IMU structure according to claim 2, characterized in that: The front mounting slot (20) has an electrical connector socket (15) and two modulation antennas (14) mounted on one side wall.

4. The fiber optic gyroscope IMU structure according to claim 3, characterized in that: The housing (1) has a mounting boss in the lower mounting groove (25) for mounting the signal acquisition and processing circuit board (9). The detector (10) is connected to the signal acquisition and processing circuit board (9) through pins.

5. The fiber optic gyroscope IMU structure according to claim 4, characterized in that: The right mounting slot (22) is equipped with a side cover three (16), a light source (17), a one-to-three coupler (26), and a light source plate (18) installed on the inner wall of the side cover three (16).

6. The fiber optic gyroscope IMU structure according to claim 1, characterized in that: The optical fiber assembly (8) includes a ring cover (801), an optical fiber ring (802), a ring base (803), a coupler (804), and a Y-wave conductor (805). A cavity is formed between the ring base (803) and the ring cover (801), and the optical fiber ring (802) is disposed in the cavity. The coupler (804) and the Y-wave conductor (805) are connected to the ring base (803). The ring cover (801) and the ring base (803) are made of soft magnetic alloy material.

7. The fiber optic gyroscope IMU structure according to claim 5, characterized in that: The front mounting slot (20) and the upper mounting slot (21) are provided with through holes for power lines to run, and the right mounting slot (22) and the lower mounting slot (25) are provided with through holes for the light source (17), the tail optical fiber of the 1-to-3 coupler (26), and the connection lines of the light source board (18) and the signal acquisition and processing circuit board (9) to run.

8. The fiber optic gyroscope IMU structure according to claim 7, characterized in that: The left mounting slot (24) and the rear mounting slot (23) are naturally connected to the lower mounting slot (25) respectively, and are used to carry the coupler (804) and the Y-wave conductor (805). A through hole is provided between the upper mounting slot (21) and the lower mounting slot (25) for carrying the connection line between the signal acquisition and processing circuit board (9) and the navigation board (3).

9. The fiber optic gyroscope IMU structure according to claim 8, characterized in that: The fiber optic assembly (8), the triaxial accelerometer (5), the storage module (6), the navigation board (3), the temperature sensor (4), the light source board (18), the power supply board, and the electrical connector socket (15) are all connected to the signal acquisition and processing circuit board (9).

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