Split modular three-axis integrated optical fiber gyroscope structure

Abstract

The application relates to a split modular three-axis integrated optical fiber gyroscope structure, which comprises an optical fiber gyroscope control assembly and three optical fiber gyroscope optical path assemblies. The four assembly structures are independent of each other and are only connected through wire harnesses, can be flexibly laid according to system-level application requirements, and are suitable for various types of system products. The assembly is modular, compact in layout, and reasonable in material selection, and high reliability and high applicability of the three-axis integrated optical fiber gyroscope are realized under small volume and weight. The heating components are installed in the optical fiber gyroscope control assembly, complete isolation between the heating device and the polarization maintaining optical path is realized, the influence of the heating device temperature change on the optical path is avoided, and the starting characteristics and temperature performance of the gyroscope are improved; the internal material of the optical fiber gyroscope optical path assembly is optimized, the configuration is refined, the weight is reduced, the high strength and high rigidity characteristics are ensured, the optical fiber is not suspended, the fiber radius is maximized, the mechanical environmental adaptability of the gyroscope is strong, and the long-term stability of the gyroscope precision is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to a split modular three-axis integrated optical fiber gyroscope structure, belonging to the field of inertial navigation. BACKGROUND

[0002] As a new generation of inertial instrument, the optical fiber gyroscope has the characteristics of all-solid-state, no rotating and friction components, strong environmental adaptability, wide application range of precision, high integration, fast response, long-term precision stability, etc., and has achieved wide application in various fields such as sea, land, air and space.

[0003] According to the optical path scheme, the optical fiber gyroscope is divided into single-axis optical fiber gyroscope and three-axis integrated optical fiber gyroscope. Among them, the three-axis integrated optical fiber gyroscope has certain advantages in volume and weight due to its common light source and common circuit. However, the connection relationship between the common optical path and the circuit and the optical path components of each axis is complex, involving more bare fiber arrangement and fiber running, and the reliability risk is higher. In addition, the installation and layout of the common optical path and circuit need to rely on the system body, and the system body involves the system installation interface, which is difficult to be universal, limiting the applicability of the three-axis integrated gyroscope, and only the optical fiber gyroscope optical path component can realize the modular design and production. Therefore, it is necessary to innovate the structure of the three-axis integrated optical fiber gyroscope to realize the completely modular design, easy assembly and high reliability, and improve the system applicability of the three-axis optical fiber gyroscope. SUMMARY

[0004] The technical problem of the present application is: for the development needs of three-axis integrated optical fiber gyroscope, a split modular three-axis integrated optical fiber gyroscope structure is proposed, which can improve the modular design and system applicability of the gyroscope while ensuring the advantages of small volume and light weight, and also needs to have good environmental adaptability and reliability, precision retention characteristics, etc.

[0005] The technical problem solved by the present application is: a split modular three-axis integrated optical fiber gyroscope structure, comprising: an optical fiber gyroscope control component and three optical fiber gyroscope optical path components; the optical fiber gyroscope control component and the optical fiber gyroscope optical path component are installed on the system body structure, and the optical fiber gyroscope control component and the three optical fiber gyroscope optical path components form a complete three-axis integrated optical fiber gyroscope; the optical fiber gyroscope control component and the optical fiber gyroscope optical path component are connected through a wire harness, and the length of the wire harness is the same, and the three optical fiber gyroscope optical path components have interchangeability;

[0006] The optical fiber gyroscope control component is used to generate an optical signal, which enters the three optical fiber gyroscope optical path components after being split. In the optical fiber gyroscope optical path component, the optical signal is split, transmitted and interfered to form an interference optical signal, which is then fed back to the optical fiber gyroscope control component. The optical fiber gyroscope control component performs photoelectric conversion to obtain an electrical signal and processes the electrical signal.

[0007] Preferably, the fiber-optic gyroscope control assembly comprises an erbium source assembly, a fiber-optic gyroscope digital circuit, and a fiber-optic gyroscope analog circuit.

[0008] Three detectors are welded on the fiber-optic gyroscope digital circuit to receive output optical signals of the three fiber-optic gyroscope optical path assemblies, and convert the optical signals into electrical signals. After being processed by the fiber-optic gyroscope digital circuit, the electrical signals become the output of the gyroscope.

[0009] The fiber-optic gyroscope analog circuit supplies power to the erbium source assembly to drive and control the temperature of the erbium source assembly.

[0010] The erbium source assembly comprises a light source, a wavelength division multiplexer, a mirror, an isolator, a filter, a first beam splitter, and a second beam splitter.

[0011] The light emitted by the light source passes through the wavelength division multiplexer, the erbium-doped optical fiber, the mirror, and the wavelength division multiplexer again, and then passes through the filter and the isolator to become the output of the erbium-doped light source. The output of the erbium-doped light source passes through the first beam splitter, which has two output ends, namely the 30 output end and the 70 output end. The 30 output end serves as the light input of one fiber-optic gyroscope optical path assembly (2), and the 70 output end serves as the input of the second beam splitter. The two output ends of the second beam splitter serve as the light inputs of the other two fiber-optic gyroscope optical path assemblies.

[0012] Preferably, the fiber-optic gyroscope control assembly and the erbium source assembly share an erbium source box body and a control assembly upper cover.

[0013] The light source, the wavelength division multiplexer, the mirror, the isolator, the filter, the first beam splitter, and the second beam splitter are installed on the bottom surface of the erbium source box body. The fiber-optic gyroscope analog circuit is installed on the boss on the bottom surface of the erbium source box body. The fiber-optic gyroscope digital circuit is installed on the boss on the side surface of the erbium source box body. The control assembly upper cover is installed on the top of the erbium source box body.

[0014] Preferably, the through holes at the four corners of the erbium source box body are external mounting holes. The first groove on the erbium source box body is a wire routing groove for the wire harness between the fiber-optic gyroscope control assembly and the fiber-optic gyroscope optical path assembly. The second groove on the erbium source box body is a wire harness routing groove for the external electrical interface of the three-axis integrated fiber-optic gyroscope. The control assembly upper cover has a recess inside.

[0015] Preferably, large circular arc surfaces are arranged at the four corners of the bottom of the erbium source box body. The optical fiber is coiled against the wall, and the fiber radius is large.

[0016] Preferably, the fiber-optic gyroscope optical path assembly comprises a fiber ring base, a fiber ring upper cover, a device base, an optical path assembly upper cover, a fiber ring, a Y waveguide, a third beam splitter, and a temperature sensor.

[0017] The light entering the optical path assembly of the fiber optic gyroscope passes through the third beam splitter and enters the single end of the Y waveguide, the double end of the Y waveguide is connected with the fiber ring, the light passes through the fiber ring and returns to the Y waveguide, and then passes through the third beam splitter and is transmitted back to the fiber optic gyroscope control assembly;

[0018] The U-shaped groove of the fiber ring base is used for mounting the fiber ring and is fixed by adhesive bonding; the fiber ring upper cover is mounted on the top of the fiber ring base and is fixed by laser welding; after installation, a rectangular cavity is formed; the device base is mounted on the middle annular surface of the fiber ring base; the Y waveguide, the third beam splitter and the temperature sensor are mounted inside the device base, and the optical path assembly upper cover is mounted on the top of the device base.

[0019] Preferably, in the optical path assembly of the fiber optic gyroscope, the fiber ring base is provided with a fiber running groove, the device base is provided with a fiber running groove and a fiber winding groove, and the fibers in the optical path assembly of the fiber optic gyroscope are all wall-mounted without suspension.

[0020] Preferably, the fiber ring base and the fiber ring upper cover are made of iron-nickel alloy; the fiber ring base and the fiber ring upper cover are connected and fixed by laser welding, and the matching position is designed with a lap joint stop, i.e., a step is arranged on the inner circle of the U-shaped groove of the fiber ring base and a step is arranged on the outer circle of the fiber ring upper cover, and the width of the matching gap before welding is not greater than 0.02mm.

[0021] Preferably, the fiber ring base is a thin-walled structure at other positions except the mounting boss and the support table for mounting the device base, and the thickness is not greater than 1mm.

[0022] Preferably, the internal optical fibers of the wire harness between the fiber optic gyroscope control assembly and the fiber optic gyroscope optical path assembly are protected by a loose tube, and the optical fibers and wires are wrapped and protected by a polyimide film after being combined.

[0023] Compared with the prior art, the present application has the following advantages:

[0024] (1) The present application adopts a split structure, the assembly is completely modularized, the internal structure is reasonable, the layout is compact, the operation is convenient, advanced and effective designs are provided for mechanics, temperature, magnetic field, etc., the environmental adaptability is strong, and the applicability and universality of the three-axis integrated fiber optic gyroscope system are improved.

[0025] (2) The present application is divided into a fiber optic gyroscope control assembly and a fiber optic gyroscope optical path assembly, each assembly is assembled respectively, the operability is good and the assembly is convenient, the production efficiency and the qualification rate can be improved; the fiber optic gyroscope control assembly and the three-axis fiber optic gyroscope optical path assembly form a complete three-axis integrated fiber optic gyroscope, and after independent assembly and testing, the three-axis integrated fiber optic gyroscope is applied to a system, and the three-axis fiber optic gyroscope optical path assembly has interchangeability in system assembly and use.

[0026] (3) The heating device and components of the triaxial integrated fiber-optic gyroscope are arranged in the fiber-optic gyroscope control assembly, including light source, detector, analog circuit, digital circuit, etc., the polarization maintaining optical path of the fiber-optic gyroscope includes fiber ring and Y waveguide, which are arranged in the fiber-optic gyroscope optical path assembly, and thermal isolation is realized. Therefore, in the starting and working process of the gyroscope, the fiber-optic gyroscope optical path assembly is in a good thermal environment, which is conducive to ensuring the starting characteristics and long-term precision of the gyroscope.

[0027] (4) In the fiber-optic gyroscope control assembly, according to the installation sequence and the height of components and devices, the devices including the erbium source and the light source, the wavelength division multiplexer are installed at the bottom of the erbium source box, the fiber-optic gyroscope analog circuit is installed in the middle of the erbium source box, and the erbium source box is shared with the light source, the fiber-optic gyroscope digital circuit is installed at the upper part of the erbium source box, which is convenient for electrical connection between the light source and the fiber-optic gyroscope analog circuit, the fiber-optic gyroscope analog circuit and the fiber-optic gyroscope digital circuit, and can make the internal space be used most effectively, and then control the volume. At the same time, two wire holes are left on the erbium source box, one is used for wire harness wiring between the fiber-optic gyroscope control assembly and the fiber-optic gyroscope optical path assembly, and the other is used for wire harness wiring of the external electrical interface of the triaxial integrated fiber-optic gyroscope, avoiding signal interference between the wire harnesses.

[0028] (5) In the fiber-optic gyroscope control assembly, the erbium source box has large circular arc surfaces at the four corners of the inner cavity bottom, in the fiber-optic gyroscope optical path assembly, the fiber ring base is provided with a fiber running groove, and the device base is provided with a fiber running groove and a fiber winding groove, which ensures that the fiber full optical path is attached to the wall, wound and has a large fiber winding radius, and is conducive to the long-term stability of the precision of the fiber-optic gyroscope.

[0029] (6) The fiber ring base and the fiber ring upper cover are made of iron-nickel alloy; the fiber ring mounting position on the fiber ring base is a U-shaped groove structure, and the fiber ring upper cover is a flat plate structure, both of which are connected and fixed by laser welding, and the matching position is designed with a lap joint stop, which can not only make the magnetic shielding effect better, but also effectively protect the fiber ring during welding. The matching gap width between the fiber ring base and the fiber ring upper cover before welding is not greater than 0.02mm, which is relatively easy to achieve, and the welding quality is good. The fiber ring base is an external mounting part of the fiber-optic gyroscope optical path assembly, which avoids the transmission and amplification of mechanical input through multiple parts, and provides better installation conditions for the fiber ring. In addition to the external mounting boss and the support table for installing the device base, the fiber ring base is a thin-walled structure with a thickness of not greater than 1mm at other positions, which effectively controls the structure weight, and the rectangular cavity structure formed after welding has the characteristics of high strength and high rigidity.

[0030] (7), the wire harness between the fiber gyroscope control assembly and the fiber gyroscope optical path assembly, the internal optical fiber is protected by a loose tube, the optical fiber and the wire after the loose tube protection are combined and wrapped with a polyimide film for protection, the entire three-axis integrated fiber gyroscope has no exposed bare fiber, and the reliability is higher. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a three-axis integrated fiber gyroscope structure diagram of the present application;

[0032] Figure 2 is a fiber gyroscope control assembly structure diagram in the present application;

[0033] Figure 3 is a fiber gyroscope optical path assembly structure diagram in the present application;

[0034] Figure 4 is an erbium source assembly structure diagram in the present application;

[0035] Figure 5 is an erbium source box body structure diagram in the present application;

[0036] Figure 6 is a control assembly upper cover structure diagram in the present application;

[0037] Fig. 7(a) is a fiber ring base bottom view structure diagram in the present application;

[0038] Fig. 7(b) is a fiber ring base top view structure diagram in the present application;

[0039] Figure 8 is a fiber ring upper cover structure diagram in the present application;

[0040] Figure 9 is a device base structure diagram in the present application;

[0041] Figure 10 is a light path assembly upper cover structure diagram in the present application. DETAILED DESCRIPTION

[0042] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0043] The present application aims at the demand of improving the modular design and system-level applicability while ensuring the small size and light weight of the triaxial integrated fiber gyroscope, and the environmental adaptability, reliability, precision retention and other problems of the triaxial integrated fiber gyroscope, and proposes a split modular triaxial integrated fiber gyroscope structure, which is different from the existing triaxial integrated fiber gyroscope structure, realizes complete modular design, has higher integration, and is fine designed for mechanics, temperature, magnetic field and other environments, including arranging the heat generating devices and the heat sensitive components of the optical path in different components to realize complete thermal isolation, strong environmental adaptability, high reliability and long-term stable precision, and realizes more flexible and extensive application of the triaxial integrated fiber gyroscope.

[0044] As shown in Figure 1 A split modular triaxial integrated fiber gyroscope structure, including a fiber gyroscope control component 1, the fiber gyroscope control component 1 and the fiber gyroscope optical path component 2 are installed on the system body structure according to the measurement requirement, the fiber gyroscope control component 1 and the three fiber gyroscope optical path components 2 constitute a complete triaxial integrated fiber gyroscope; three fiber gyroscope optical path components 2. The fiber gyroscope control component 1 and the fiber gyroscope optical path component 2 are connected through a wire harness 4. The length of the wire harness is the same, and the three fiber gyroscope optical path components have interchangeability.

[0045] The fiber gyroscope control component 1 is used to generate an optical signal, after the optical signal is processed by light splitting, it enters the three fiber gyroscope optical path components 2, in the fiber gyroscope optical path component 2, after the optical signal is processed by light splitting, transmission and interference to form an interference optical signal, it is fed back to the fiber gyroscope control component 1, the photoelectric conversion is carried out by the fiber gyroscope control component 1 to obtain an electrical signal, and the electrical signal is processed.

[0046] As shown in Figure 2 The fiber gyroscope control component 1 includes an erbium source component 3, a fiber gyroscope analog circuit 12, a fiber gyroscope digital circuit 11 and a control component upper cover 13 from bottom to top, the detector 14 is installed on the fiber gyroscope digital circuit 11, and the heat generating devices are all installed in the fiber gyroscope control component 1;

[0047] The fiber gyroscope analog circuit 12 supplies power to the erbium source component 3 to realize the driving and temperature control of the erbium source component 3.

[0048] Three detectors 14 are welded on the fiber gyroscope digital circuit 11 to receive the output optical signals of the three fiber gyroscope optical path components 2 respectively, and convert the optical signals into electrical signals, the electrical signals become the output of the gyroscope after being processed by the fiber gyroscope digital circuit 11.

[0049] As shown in Figure 3As shown in the figure, the fiber-optic gyroscope optical path assembly 2 includes a fiber ring base 21, a fiber ring cover 22, a device base 23, an optical path assembly cover 24, a fiber ring 25, a Y waveguide 26, a third beam splitter 29, and a temperature sensor 28 is installed on the fiber-optic gyroscope optical path assembly 2; the third beam splitter 29 is a 55 beam splitter.

[0050] As shown in the figure, Figure 4 The erbium source assembly 3 includes an erbium source box 31, a light source 32, a wavelength division multiplexer 33, a mirror 34, an isolator 35, a filter 36, a first beam splitter 37, and a second beam splitter 27.

[0051] The first beam splitter is a 37 beam splitter, and the second beam splitter is a 55 beam splitter.

[0052] As shown in the figure, Figure 2 , Figure 4 , Figure 5 The fiber-optic gyroscope control assembly 1 and the erbium source assembly 3 share the erbium source box 31 and the control assembly cover 13. The light source 32, the wavelength division multiplexer 33, the mirror 34, the isolator 35, the filter 36, the first beam splitter 37, and the second beam splitter 27 are installed on the bottom surface 31-1 of the erbium source box 31. The light source has a boss at the bottom to ensure the depth of the light source fastening thread, and the devices such as the wavelength division multiplexer 33 are installed in a position with a groove at the bottom to facilitate position limitation. The light source 32 is fastened to the erbium source box 31 by screws. Four corners of the inner cavity bottom of the erbium source box 31 are provided with large circular arc surfaces 31-7, and the erbium-doped fiber is coiled against the wall with a large fiber radius. The light emitted by the light source 32 passes through the wavelength division multiplexer 33, the erbium-doped fiber, the mirror 34 in turn, returns and passes through the wavelength division multiplexer 33 again, then passes through the filter 36 and the isolator 35, becomes the output of the erbium-doped light source, and then passes through the first beam splitter. The first beam splitter includes two output ends, which are 30 output end and 70 output end respectively. The 30 output end is used as the light input of the one-axis fiber-optic gyroscope optical path assembly 2, and the 70 output end is used as the input of the second beam splitter. The two output ends of the second beam splitter are used as the light inputs of the two-axis fiber-optic gyroscope optical path assembly 2.

[0053] The fiber-optic gyroscope analog circuit 12 is installed on the five bosses 31-2 of the bottom surface of the erbium source box 31, fastened with the erbium source box 31 by screws, and occupies the middle space of the erbium source box 31 together with the light source. The fiber-optic gyroscope digital circuit 11 is installed on the four bosses 31-3 of the side surface of the erbium source box 31, and occupies the upper space of the erbium source box 31. The heat-emitting components and devices such as the light source 32, the fiber-optic gyroscope analog circuit 12, the detector 14, and the fiber-optic gyroscope digital circuit 11 are directly installed on the erbium source box 31 and dissipate heat by heat conduction. The three detectors 14 installed on the fiber-optic gyroscope digital circuit 11 respectively receive the light output of the three-axis fiber-optic gyroscope optical path assembly 2. The tail fiber of one detector and the 30 output end fiber of the first beam splitter and the two output end fibers of the second beam splitter are connected with the third beam splitter 29 in the three fiber-optic gyroscope optical path assemblies 2 after being protected by a loose tube. The wires of the Y waveguide 26 and the temperature sensor 28 in the fiber-optic gyroscope optical path assembly 2 are connected with the fiber-optic gyroscope digital circuit 11 in the fiber-optic gyroscope control assembly 1. The three bundles of optical fibers and wires between the three fiber-optic gyroscope optical path assemblies 2 and the fiber-optic gyroscope control assembly 1 form three wire bundles, which are wrapped and protected by a polyimide film. The three wire bundles have the same length to ensure the interchangeability of the three-axis fiber-optic gyroscope optical path assembly 2 when applied. The control assembly upper cover 13 is installed on the top of the erbium source box 31 and fastened with the erbium source box by screws.

[0054] As shown in Figure 5 , the first groove 31-5 on the erbium source box 31 is a wire slot for the wire bundle 4 between the fiber-optic gyroscope control assembly 1 and the fiber-optic gyroscope optical path assembly 2, and the second groove 31-6 on the erbium source box 31 is a wire slot for the electrical interface wire bundle of the three-axis integrated fiber-optic gyroscope. Separate wire routing can avoid signal interference between wire bundles. The four through holes 31-4 at the four corners of the erbium source box 31 are external mounting holes for the fiber-optic gyroscope control assembly 1.

[0055] As shown in Figure 6 , the control assembly upper cover 13 has a groove 13-1 inside, which can increase the space between the control assembly upper cover 13 and the fiber-optic gyroscope digital circuit 11. The control assembly upper cover 13 is thick around to ensure the installation strength.

[0056] As shown in Figure 3 , Fig. 7(a), Figures 7(b) to 10As shown, the U-shaped groove 21-1 of the fiber ring base 21 is used for the fiber ring 25, and the fiber ring base 21 is provided with a fiber running groove 21-5 fixed by adhesive bonding. The device base 23 is mounted on the middle annular surface 21-2 of the fiber ring base 21, and the reverse surface has a support table 21-6 fastened by screws. The fiber ring upper cover 22 is mounted on the top of the fiber ring base 21 and is connected and fixed by laser welding. The lap joint stop is designed in the matching position, that is, a step is arranged on the inner circle of the U-shaped groove of the fiber ring base, and a step is arranged on the outer circle of the fiber ring upper cover. This can not only make the magnetic shielding effect better, but also effectively protect the fiber ring during welding. The width of the matching gap before welding is not greater than 0.02 mm. The Y waveguide 26, the third beam splitter 29, and the temperature sensor 28 are installed inside the device base 23. The Y waveguide 26 is fastened with the device base 23 by screws. The installation position is designed with a pit. The tail fiber of the device is flush with the bottom surface of the fiber running groove, avoiding the tail fiber hanging in the air. The device base 23 is provided with a fiber running groove 23-1 and a fiber winding groove 23-2, which ensures that the fibers are arranged on the wall. The optical path assembly upper cover 24 is mounted on the top of the device base 23 and is fastened by screws. The square hole 24-1 on the optical path assembly upper cover 24 is a wire hole for the wire 4 between the optical fiber gyroscope optical path assembly 2 and the optical fiber gyroscope control assembly 1. The hole here can also be designed as a groove. The four mounting bosses 21-3 of the fiber ring base 21 are external mounting surfaces, and the four through holes 21-4 are external mounting holes.

[0057] The fiber ring base 21 and the fiber ring upper cover 22 are made of soft magnetic nickel alloy 1J85. Except for the mounting bosses 21-3 and the support table 21-6 for mounting the device base 23, other positions of the fiber ring base 21 are thin-walled structures with a thickness not greater than 1 mm, effectively controlling the structure weight, and the structure formed after welding with the fiber ring has the characteristics of high strength and high rigidity.

[0058] The fiber ring base 21 and the fiber ring upper cover 22 are made of soft magnetic alloy 1J85. The materials of the remaining parts are all aluminum alloy 2A12.

[0059] The triaxial integrated fiber-optic gyroscope comprises a fiber-optic gyroscope control assembly and three fiber-optic gyroscope optical path assemblies. The four assemblies are independent of each other and are not dependent on the system body, and can complete the production and testing of the triaxial gyroscope, only have a wire harness connection, and only need to design a mounting interface of the four assemblies on the system body. The system can be flexibly arranged according to the application requirements of the system level, and is suitable for various types of system products. The assembly is modular, compact, and reasonably selected, and realizes high reliability and high applicability of the triaxial integrated fiber-optic gyroscope with small size and weight. The heating components are installed in the fiber-optic gyroscope control assembly, realizing complete isolation between the heating device and the polarization maintaining optical path, avoiding the influence of the heating device temperature change on the optical path, and improving the startup characteristics and temperature performance of the gyroscope. The internal materials of the fiber-optic gyroscope optical path assembly are optimized, and the configuration is fine, considering the weight reduction and ensuring the high strength and high stiffness characteristics. The fiber is not suspended, and the fiber radius is maximized. The gyroscope has strong mechanical environmental adaptability, and is beneficial to ensure the long-term stability of the gyroscope precision.

[0060] The triaxial fiber-optic gyroscope provided by the application has stronger applicability. According to the function of the gyroscope, fine design is performed on the aspects of thermal isolation, mechanical resistance, magnetic field shielding, and fiber arrangement. The structure is compact, the gyroscope has strong environmental adaptability, and is also beneficial to ensure the startup characteristics, temperature performance, long-term stability of precision, and the like of the gyroscope.

[0061] The fiber-optic gyroscope control assembly is compactly arranged, and the control volume is small. In the optical path assembly, the structure of different material parts is fine, the thin-walled structure of the fiber ring mounting structure, and the rectangular cavity after assembly provides an anti-vibration and magnetic shielding environment for the fiber ring, while ensuring the mechanical properties of the optical path assembly and effectively controlling the weight. The triaxial integrated fiber-optic gyroscope structure is completely modularized, has strong application adaptability at the system level, the assembly structure is compact, has strong environmental adaptability, and has high reliability. The triaxial integrated fiber-optic gyroscope is more flexible and widely applied.

[0062] The undisclosed parts of the application belong to the known technology in the field.

Claims

1. A split modular triad integrated optical fiber gyroscope structure, characterized in that It comprises: The fiber-optic gyroscope control assembly (1) and three fiber-optic gyroscope optical path assemblies (2); the fiber-optic gyroscope control assembly (1) and the fiber-optic gyroscope optical path assemblies (2) are installed on the system body structure, and the fiber-optic gyroscope control assembly (1) and the three fiber-optic gyroscope optical path assemblies (2) constitute a complete three-axis integrated fiber-optic gyroscope; the fiber-optic gyroscope control assembly (1) and the fiber-optic gyroscope optical path assemblies (2) are connected through a wire harness (4), and the wire harness has the same length, and the three fiber-optic gyroscope optical path assemblies have interchangeability; The fiber-optic gyroscope control assembly (1) is used for generating an optical signal, after the optical signal is subjected to light splitting processing, the optical signal enters the three fiber-optic gyroscope optical path assemblies (2), in the fiber-optic gyroscope optical path assemblies (2), after the optical signal is subjected to light splitting, transmission and interference to form an interference optical signal, the interference optical signal is fed back to the fiber-optic gyroscope control assembly (1), photoelectric conversion is performed on the interference optical signal by the fiber-optic gyroscope control assembly (1) to obtain an electrical signal, and the electrical signal is processed; The fiber-optic gyroscope control assembly (1) comprises an erbium source assembly (3), a fiber-optic gyroscope digital circuit (11) and a fiber-optic gyroscope analog circuit (12); Three detectors (14) are welded on the fiber-optic gyroscope digital circuit (11) to receive output optical signals of the three fiber-optic gyroscope optical path assemblies (2) respectively, and the optical signals are converted into electrical signals, and the electrical signals are processed by the fiber-optic gyroscope digital circuit (11) to become the output of the gyroscope; The fiber-optic gyroscope analog circuit (12) supplies power to the erbium source assembly (3) to realize driving and temperature control of the erbium source assembly (3); The erbium source assembly (3) comprises a light source (32), a wavelength division multiplexer (33), a mirror (34), an isolator (35), a filter (36), a first beam splitter (37) and a second beam splitter (27); The light emitted by the light source (32) passes through the wavelength division multiplexer (33), an erbium-doped optical fiber, the mirror (34) in sequence, returns to pass through the wavelength division multiplexer (33) again, and then passes through the filter (36) and the isolator (35) to become an erbium-doped light source output, the erbium-doped light source output passes through the first beam splitter (37), the first beam splitter (37) comprises two output ends, which are a 30 output end and a 70 output end, the 30 output end is used as the light input of one fiber-optic gyroscope optical path assembly (2), and the 70 output end is used as the input of the second beam splitter (27), and the two output ends of the second beam splitter are used as the light inputs of the other two fiber-optic gyroscope optical path assemblies (2); The fiber-optic gyroscope control assembly (1) and the erbium source assembly (3) share an erbium source box body (31) and a control assembly upper cover (13). The light source (32), the wavelength division multiplexer (33), the mirror (34), the isolator (35), the filter (36), the first beam splitter (37) and the second beam splitter (27) are installed on the bottom surface (31-1) of the erbium source box body (31), the fiber-optic gyroscope analog circuit (12) is installed on the boss (31-2) of the bottom surface of the erbium source box body (31), the fiber-optic gyroscope digital circuit (11) is installed on the boss (31-3) of the side surface of the erbium source box body (31), and the control assembly upper cover (13) is installed on the top of the erbium source box body (31). The through holes (31-4) at the four corners of the outer periphery of the erbium source box body (31) are external mounting holes, the first groove (31-5) on the erbium source box body (31) is a wire harness (4) routing groove between the fiber-optic gyroscope control assembly (1) and the fiber-optic gyroscope optical path assembly (2), and the second groove (31-6) on the erbium source box body (31) is a three-axis integrated fiber-optic gyroscope external electrical interface wire harness routing groove. The erbium source box body (31) is internally provided with large circular arc surfaces (31-7) at the four corners of the bottom, and the fiber is coiled in adhesion and has a large fiber coil radius.

2. The split modular triad integrated fiber optic gyroscope structure of claim 1, wherein, The fiber-optic gyroscope optical path assembly (2) comprises a fiber coil base (21), a fiber coil upper cover (22), a device base (23), an optical path assembly upper cover (24), a fiber coil (25), a Y waveguide (26), a third beam splitter (29) and a temperature sensor (28). The light entering the fiber-optic gyroscope optical path assembly (2) passes through the third beam splitter (29) and enters the single end of the Y waveguide (26), the double ends of the Y waveguide (26) are connected with the fiber coil (25), the light passes through the fiber coil and returns to the Y waveguide (26) again, and then passes through the third beam splitter (29) and is transmitted back to the fiber-optic gyroscope control assembly (1). The U-shaped groove (21-1) of the fiber coil base (21) is used for mounting the fiber coil (25) and is fixed by adhesion; the fiber coil upper cover (22) is installed on the top of the fiber coil base (21) and is connected and fixed by laser welding, and a rectangular cavity is formed after installation; the device base (23) is installed on the middle annular surface (21-2) of the fiber coil base (21); the Y waveguide (26), the third beam splitter (29) and the temperature sensor (28) are installed inside the device base (23), and the optical path assembly upper cover (24) is installed on the top of the device base (23).

3. The split modular triad integrated fiber optic gyroscope structure of claim 2, wherein, In the fiber-optic gyroscope optical path assembly (2), the fiber coil base (21) is provided with a fiber routing groove (21-5), the device base (23) is provided with a fiber routing groove (23-1) and a fiber coil groove (23-2), and the fiber in the fiber-optic gyroscope optical path assembly (2) is all adhered and routed without suspension.

4. The split modular triad integrated fiber optic gyroscope structure of claim 2, wherein, The fiber coil base (21) and the fiber coil upper cover (22) are made of iron-nickel alloy; the fiber coil base (21) and the fiber coil upper cover (22) are connected and fixed by laser welding, and the matching position is designed to have a lap joint stop, that is, a step (21-7) is arranged on the inner circle of the U-shaped groove of the fiber coil base (21) and a step (22-1) is arranged on the outer circle of the fiber coil upper cover (22), and the matching gap width before welding is not greater than 0.02 mm.

5. The split modular triad integrated fiber optic gyroscope structure of claim 2, wherein, The optical fiber ring base (21) is a thin-walled structure with a thickness of not more than 1mm except for the mounting boss (21-3) and the support table (21-6) for mounting the device base (23).

6. The split modular three-axis integrated optical fiber gyroscope structure according to claim 2, characterized in that the internal optical fiber of the wire harness (4) between the optical fiber gyroscope control assembly (1) and the optical fiber gyroscope optical path assembly (2) is protected by a loose sleeve, and the optical fiber and the wire are wrapped and protected by a polyimide film.

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