Split type modularized three-axis integrated optical fiber gyroscope structure

Abstract

The invention relates to a split type modularized three-axis integrated optical fiber gyroscope structure. The split type modularized three-axis integrated optical fiber gyroscope structure comprises an optical fiber gyroscope control assembly and three optical fiber gyroscope light path assemblies, the four assemblies are mutually independent in structure, are connected only through wire harnesses, can be flexibly arranged according to system-level application requirements, and are suitable for various types of system products. The three-axis integrated optical fiber gyroscope is high in component modularization, compact in layout and reasonable in material selection, and high reliability and high applicability of the three-axis integrated optical fiber gyroscope under the condition of small size and weight are realized. The heating components are all installed in the optical fiber gyroscope control assembly, complete isolation between the heating device and a polarization maintaining light path is achieved, the influence of temperature change of the heating device on the light path is avoided, and the starting characteristic and the temperature performance of the gyroscope are improved. Materials are preferably selected in the optical path assembly of the optical fiber gyroscope, the structure is refined, the characteristics of reducing the weight and guaranteeing high strength and high rigidity are considered, optical fibers are free of suspension in fiber walking, the fiber walking radius is maximized, the mechanical environment adaptability of the gyroscope is high, and the long-term stability of the precision of the gyroscope is guaranteed.

Description

Technical Field

[0001] The invention relates to a split-type modular three-axis integrated optical fiber gyroscope structure, belonging to the field of inertial navigation. Background Art

[0002] As a new generation of inertial instrument, fiber optic gyroscope has the characteristics of all-solid-state, no rotating and friction parts, strong environmental adaptability, wide range of precision applications, high integration, fast response, and long-term stable precision. It has been widely used in various fields such as sea, land, air, and space.

[0003] Fiber optic gyroscopes are divided into single-axis fiber optic gyroscopes and three-axis integrated fiber optic gyroscopes according to their optical path solutions. Among them, the three-axis integrated fiber optic gyroscope has certain advantages in terms of volume and weight due to its shared light source and shared circuit. However, the connection relationship between the common optical path, circuit and the optical path components of each axis is relatively complex, involving the arrangement and routing of more bare fibers, 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-level body, and the system-level body involves the system-level installation interface, which is difficult to be universal, limiting the applicability of the three-axis integrated gyroscope. Only the optical path components of the fiber optic gyroscope can achieve modular design and production. Therefore, it is necessary to innovate the structure of the three-axis integrated fiber optic gyroscope to achieve a fully modular design that is easy to assemble and has high reliability, thereby improving the system-level applicability of the three-axis fiber optic gyroscope. Summary of the invention

[0004] The technical problem solved by the present invention is as follows: In response to the development demand of the three-axis integrated fiber optic gyroscope, a split modular three-axis integrated fiber optic gyroscope structure is proposed, which improves the modular design and system-level applicability of the gyroscope while ensuring its advantages of small size and light weight. At the same time, it needs to have good environmental adaptability, reliability, accuracy retention characteristics, etc.

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

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

[0007] Preferably, the fiber optic gyroscope control component includes an erbium source component, a fiber optic gyroscope digital circuit, and a fiber optic gyroscope analog circuit;

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

[0009] The fiber optic gyroscope analog circuit supplies power to the erbium source component to achieve driving and temperature control of the erbium source component;

[0010] The erbium source assembly includes a light source, a wavelength division multiplexer, a reflector, an isolator, a filter, a first beam splitter, and a second beam splitter;

[0011] The light emitted by the light source passes through a wavelength division multiplexer, an erbium-doped optical fiber, a reflector, returns, passes through the wavelength division multiplexer again, passes through a filter, and an isolator, and becomes an erbium-doped light source output. The erbium-doped light source output passes through a first beam splitter. The first beam splitter includes two output ends, namely, an output end 30 and an output end 70. The output end 30 serves as an optical input of an optical fiber gyroscope optical path component (2), and the output end 70 serves as an input of a second beam splitter. The two output ends of the second beam splitter serve as optical inputs of two other optical fiber gyroscope optical path components.

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

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

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

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

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

[0017] The light entering the optical path component of the fiber optic gyroscope passes through the third beam splitter and enters the single end of the Y waveguide. The double ends of the Y waveguide are connected to the fiber optic ring. The light passes through the fiber optic ring and then returns to the Y waveguide. After passing through the third beam splitter, the light is transmitted back to the fiber optic gyroscope control component.

[0018] The U-shaped groove (-) of the fiber ring base is used to install the fiber ring and is fixed by gluing; the fiber ring cover is installed on the top of the fiber ring base and is connected and fixed by laser welding to form a rectangular cavity after installation; the device base is installed on the middle annular surface (-) of the fiber ring base; the Y waveguide, the third beam splitter, and the temperature sensor are installed inside the device base, and the optical path component cover is installed 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 optical fiber in the optical path assembly of the fiber optic gyroscope is run along the wall without being suspended.

[0020] Preferably, the fiber optic ring base and the fiber optic ring upper cover are made of iron-nickel alloy; the fiber optic ring base and the fiber optic ring upper cover are connected and fixed by laser welding, and the matching positions are designed with overlapping stoppers, that is, a step is provided on the inner circle of the U-shaped groove of the fiber optic ring base and a step is provided on the outer circle of the fiber optic ring upper cover, and the width of the matching gap before welding is not more than 0.02mm.

[0021] Preferably, except for the mounting boss and the support platform for mounting the device base, the rest of the optical fiber ring base is a thin-walled structure with a thickness of no more than 1 mm.

[0022] Preferably, the optical fiber inside the wiring harness between the optical fiber gyroscope control component and the optical fiber gyroscope optical path component is protected by a loose tube, and the optical fiber and the wire are combined and wrapped with a polyimide film for protection.

[0023] The advantages of the present invention compared with the prior art are:

[0024] (1) The present invention adopts a split structure and a completely modular component design. The internal structure of the component has a reasonable configuration, a compact layout, and is easy to operate. It has advanced and effective designs for mechanical, temperature, magnetic field, and other environments, and has strong environmental adaptability, thereby improving the applicability and wide application of the three-axis integrated fiber optic gyroscope system level.

[0025] (2) The present invention is divided into a fiber optic gyroscope control component and a fiber optic gyroscope optical path component. Each component is assembled separately, which is easy to operate and easy to assemble, thereby improving production efficiency and qualified rate. The fiber optic gyroscope control component and the three-axis fiber optic gyroscope optical path component form a complete three-axis integrated fiber optic gyroscope, which is independently assembled and tested and then applied to the system. During system-level assembly and use, the three-axis fiber optic gyroscope optical path components are interchangeable.

[0026] (3) The heating devices and components of the three-axis integrated fiber optic gyroscope are all arranged in the fiber optic gyroscope control assembly, including the light source, detector, analog circuit, digital circuit, etc. The polarization-maintaining optical path of the fiber optic gyroscope, including the fiber ring and Y waveguide, are arranged in the fiber optic gyroscope optical path assembly to achieve thermal isolation. Therefore, during the startup and operation of the gyroscope, the fiber optic gyroscope optical path assembly is in a good thermal environment, which is conducive to ensuring the startup characteristics and long-term maintenance of the gyroscope's accuracy.

[0027] (4) In the fiber optic gyroscope control assembly, a layered layout is performed according to the installation sequence and the height of the components and devices. The light source, wavelength division multiplexer and other devices contained in the erbium source 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 fiber optic gyroscope digital circuit is installed in the upper part of the erbium source box. This facilitates the electrical connection between the light source and the fiber optic gyroscope analog circuit, and between the fiber optic gyroscope analog circuit and the fiber optic gyroscope digital circuit, and enables the most effective use of the internal space, thereby controlling the volume. At the same time, two outlet holes are left on the erbium source box, one for the wiring harness between the fiber optic gyroscope control assembly and the fiber optic gyroscope optical path assembly, and the other for the wiring harness of the external electrical interface of the three-axis integrated fiber optic gyroscope, to avoid signal interference between the harnesses.

[0028] (5) In the fiber optic gyroscope control assembly, large arc surfaces are provided at the four corners of the bottom of the inner cavity of the erbium source box body. In the fiber optic gyroscope optical path assembly, the fiber ring base is provided with a fiber routing groove, and the device base is provided with a fiber routing groove and a fiber winding groove, so as to ensure that the entire optical path of the optical fiber is routed along the wall, coiled, and has a large fiber winding radius, which is beneficial to the long-term stability of the accuracy of the fiber optic gyroscope.

[0029] (6) The fiber ring base and the fiber ring cover are made of iron-nickel alloy; the fiber ring installation position on the fiber ring base is a U-shaped groove structure, and the fiber ring cover is a flat plate structure. The two are connected and fixed by laser welding. The matching position is designed with a lap stop, which can not only make the magnetic shielding effect better, but also effectively protect the fiber ring during welding. Before welding, the matching gap width between the fiber ring base and the fiber ring cover is no more than 0.02mm. This size is easy to process and the weld quality is good during welding. The fiber ring base is an external installation part of the optical path component of the fiber optic gyroscope, which avoids the transmission and amplification of mechanical input through multi-level parts and provides better installation conditions for the fiber ring. Except for the external installation boss and the support platform for installing the device base, the other positions of the fiber ring base are thin-walled structures with a thickness of no more than 1mm, which effectively controls the weight of the structure. The rectangular cavity structure formed after welding with the fiber ring base and the fiber ring cover has the characteristics of high strength and high rigidity.

[0030] (7) The optical fiber in the wiring harness between the fiber optic gyroscope control component and the fiber optic gyroscope optical path component is protected by a loose tube. The optical fiber and the wire protected by the loose tube are combined and then wrapped with a polyimide film for protection. The entire three-axis integrated fiber optic gyroscope has no exposed bare fibers and has higher reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural diagram of the three-axis integrated fiber optic gyroscope of the present invention;

[0032] Figure 2 It is a structural diagram of the fiber optic gyroscope control component in the present invention;

[0033] Figure 3 It is a structural diagram of the optical path component of the fiber optic gyroscope in the present invention;

[0034] Figure 4 is a structural diagram of the erbium source assembly in the present invention;

[0035] Figure 5 It is a structural diagram of the erbium source box in the present invention;

[0036] Figure 6 This is a structural diagram of the upper cover of the control component in the present invention;

[0037] FIG. 7( a ) is a structural diagram of the optical fiber ring base in the present invention when viewed from above;

[0038] FIG7( b ) is a top view of the optical fiber ring base of the present invention;

[0039] Figure 8 This is a structural diagram of the optical fiber ring cover in the present invention;

[0040] Fig. 9 It is a structural diagram of the device base in the present invention;

[0041] Fig.10 It is a structural diagram of the upper cover of the optical path component in the present invention. DETAILED DESCRIPTION

[0042] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] The present invention aims at the needs of improving modular design and system-level applicability of the three-axis integrated fiber optic gyroscope while ensuring its small size and light weight, as well as the environmental adaptability, reliability, precision maintenance and other issues of the three-axis integrated fiber optic gyroscope. A split modular three-axis integrated fiber optic gyroscope structure is proposed, which is different from the existing three-axis integrated fiber optic gyroscope structure in that it realizes a completely modular design with higher integration, and has refined designs for mechanical, temperature, magnetic field and other environments, including arranging heat-generating devices and heat-sensitive components of the optical path in different components, thereby realizing complete thermal isolation, strong environmental adaptability, high reliability, and long-term stable precision; and realizing more flexible and extensive applications of the three-axis integrated fiber optic gyroscope.

[0044] like Figure 1 As shown, a split modular three-axis integrated fiber optic gyroscope structure includes a fiber optic gyroscope control component 1. The fiber optic gyroscope control component 1 and the fiber optic gyroscope optical path component 2 are installed on the system body structure according to measurement needs. The fiber optic gyroscope control component 1 and the three fiber optic gyroscope optical path components 2 form a complete three-axis integrated fiber optic gyroscope; three fiber optic gyroscope optical path components 2. The fiber optic gyroscope control component 1 and the fiber optic gyroscope optical path component 2 are connected by a wire harness 4. The length of the wire harness is the same, and the three fiber optic gyroscope optical path components are interchangeable.

[0045] The fiber optic gyroscope control component 1 is used to generate an optical signal. After the optical signal is split, it enters the three fiber optic gyroscope optical path components 2. Inside the fiber optic gyroscope optical path component 2, the optical signal is split, transmitted, and interfered to form an interference optical signal, and then fed back to the fiber optic gyroscope control component 1, which performs photoelectric conversion to obtain an electrical signal and processes the electrical signal.

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

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

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

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

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

[0051] The first beam splitter and the second beam splitter are: a 37 beam splitter and a 55 beam splitter.

[0052] like Figure 2 , Figure 4 , Figure 5 As shown, the fiber optic gyro control component 1 and the erbium source component 3 share the erbium source box body 31 and the control component upper cover 13. The light source 32, the wavelength division multiplexer 33, the reflector 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, wherein the bottom of the light source has a boss to ensure the depth of the light source fastening thread, and the bottom of the installation position of the wavelength division multiplexer 33 and other components has a groove to facilitate the position limitation, and the light source 32 is fastened to the erbium source box body 31 by screws; large arc surfaces 31-7 are set at the four corners of the bottom of the inner cavity of the erbium source box body 31, and the erbium-doped optical fiber is coiled against the wall with a large coil radius. The light emitted by the light source 32 passes through the wavelength division multiplexer 33, the erbium-doped optical fiber, the reflector 34 in sequence, returns and passes through the wavelength division multiplexer 33 again, 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, wherein the first beam splitter includes two output ends, namely, the output end 30 and the output end 70, the output end 30 is used as the light input of the one-axis fiber optic gyroscope optical path component 2, the output end 70 is used as the input of the second beam splitter, and the two output ends of the second beam splitter are respectively used as the light input of the two-axis fiber optic gyroscope optical path component 2.

[0053] The fiber optic gyroscope analog circuit 12 is installed on 5 bosses 31-2 on the bottom surface of the erbium source box body 31, and is fastened with the erbium source box body 31 by screws, and occupies the middle space of the erbium source box body 31 together with the light source. The fiber optic gyroscope digital circuit 11 is installed on 4 bosses 31-3 on the side of the erbium source box body 31, and occupies the upper space of the erbium source box body 31. The heating 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 body 31, and heat is dissipated by heat conduction. The three detectors 14 installed on the fiber optic gyroscope digital circuit 11 receive the light output of the three-axis fiber optic gyroscope optical path component 2 respectively. The 30 output end optical fibers of the first beam splitter and the two output end optical fibers of the second beam splitter are respectively connected with the pigtail of a detector, and after being protected by a loose tube, they are connected with the third beam splitter 29 in the three fiber optic gyroscope optical path components 2. The wires of the Y waveguide 26 and the temperature sensor 28 in the optical path component 2 of the optical fiber gyroscope are connected to the optical fiber gyroscope digital circuit 11 in the control component 1 of the optical fiber gyroscope. The three optical fibers and wires between the optical path components 2 of the optical fiber gyroscope and the control component 1 of the optical fiber gyroscope form three wire harnesses, which are wrapped with polyimide film for protection. The three wire harnesses are of the same length to ensure the interchangeability of the optical path component 2 of the three-axis optical fiber gyroscope when used. The upper cover 13 of the control component is installed on the top of the erbium source box body 31 and is fastened to the erbium source box body by screws.

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

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

[0056] like Figure 3 , Figure 7(a) , Figure 7(b) to Figure 10As shown, the U-shaped groove 21-1 of the optical fiber ring base 21 is used for the optical fiber ring 25, which is fixed by adhesive bonding, and the optical fiber ring base 21 is provided with a fiber running groove 21-5; the device base 23 is installed on the middle annular surface 21-2 of the optical fiber ring base 21, and a support platform 21-6 is provided on the reverse side, which is fastened by screws; the optical fiber ring cover 22 is installed on the top of the optical fiber ring base 21, connected and fixed by laser welding, and the matching position is designed with overlapping stoppers, that is, the inner circle of the U-shaped groove of the optical fiber ring base and the outer circle of the optical fiber ring cover are respectively provided with steps, which can not only make the magnetic shielding effect better, but also effectively protect the optical fiber ring during welding, and the matching gap width before welding is not more than 0.02mm. 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 and the device base 23 are fastened by screws. A pit is designed at the installation position. The device pigtail is flush with the bottom surface of the fiber routing groove to prevent the pigtail from hanging in the air. The device base 23 is provided with a fiber routing groove 23-1 and a fiber winding groove 23-2 to ensure that the optical fibers are arranged close to the wall. The optical path component cover 24 is installed on the top of the device base 23 and fastened by screws; the square hole 24-1 on the optical path component cover 24 is the routing hole for the wire harness 4 between the optical path component 2 of the fiber optic gyroscope and the control component 1 of the fiber optic gyroscope. The hole here can also be designed as a groove. The four mounting bosses 21-3 of the optical fiber ring base 21 are external mounting surfaces, and the four through holes 21-4 are external mounting holes.

[0057] In the split modular three-axis integrated fiber optic gyroscope structure, the fiber ring base 21 and the fiber ring cover 22 are made of soft magnetic nickel alloy 1J85; except for the mounting boss 21-3 and the support platform 21-6 for mounting the device base 23, the rest of the fiber ring base 21 is a thin-walled structure with a thickness of no more than 1 mm, which effectively controls the weight of the structure, and the structural configuration formed after welding with the fiber ring has the characteristics of high strength and high rigidity.

[0058] The split modular three-axis integrated fiber optic gyroscope structure has a fiber ring mounting base 21 and a fiber ring upper cover 22 made of soft magnetic alloy 1J85, and other parts are made of aluminum alloy 2A12.

[0059] The three-axis integrated fiber optic gyroscope includes a fiber optic gyroscope control component and three fiber optic gyroscope optical path components. The four components are independent of each other and do not rely on the system body. The production and testing of the three-axis gyroscope can be completed. There is only a harness connection. The system body only needs to design the installation interface with the four components. It can be flexibly arranged according to the system-level application requirements and is suitable for various types of system products. The components are highly modularized, compact in layout, and reasonably selected in materials, which realizes the high reliability and high applicability of the three-axis integrated fiber optic gyroscope under small volume and weight. The heating components are all installed in the fiber optic gyroscope control component to achieve complete isolation between the heating device and the polarization-maintaining optical path, avoiding the influence of the temperature change of the heating device 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 component are selected, and the configuration is refined, taking into account the characteristics of reducing weight and ensuring high strength and high rigidity. The optical fiber is routed without hanging, the routing radius is maximized, the gyroscope has strong adaptability to the mechanical environment, and is conducive to ensuring the long-term stability of the gyroscope accuracy.

[0060] The triaxial fiber optic gyroscope provided by the present invention has stronger applicability. At the same time, according to the function of the gyroscope, refined designs in terms of thermal isolation, mechanical resistance, magnetic field shielding, fiber arrangement, etc. are carried out, the structure is compact, the gyroscope has strong environmental adaptability, and is more conducive to ensuring the startup characteristics, temperature performance, long-term stability of accuracy, etc. of the gyroscope.

[0061] The fiber optic gyroscope control component has a compact layout to control the volume; the structure of the parts made of different materials in the optical path component is refined, and the thin-walled structure of the fiber optic ring installation structure and the rectangular cavity after assembly provide the fiber optic ring with an anti-vibration and magnetic shielding environment, while ensuring the mechanical properties of the optical path component and effectively controlling the weight. The three-axis integrated fiber optic gyroscope structure is a completely modular design with strong adaptability to system-level applications; the component structure is compact, has strong environmental adaptability, and is highly reliable; it enables more flexible and extensive applications of the three-axis integrated fiber optic gyroscope.

[0062] The undisclosed parts of the present invention belong to the common knowledge in the art.

Claims

1. A split modular three-axis integrated fiber optic gyroscope structure, characterized in that include: A fiber optic gyroscope control component (1) and three fiber optic gyroscope optical path components (2); the fiber optic gyroscope control component (1) and the fiber optic gyroscope optical path components (2) are installed on the system body structure, and the fiber optic gyroscope control component (1) and the three fiber optic gyroscope optical path components (2) form a complete three-axis integrated fiber optic gyroscope; the fiber optic gyroscope control component (1) and the fiber optic gyroscope optical path components (2) are connected by a wire harness (4), and the length of the wire harness is the same, and the three fiber optic gyroscope optical path components are interchangeable; The optical fiber gyroscope control component (1) is used to generate an optical signal. After the optical signal is subjected to optical splitting processing, it enters three optical fiber gyroscope optical path components (2). Inside the optical fiber gyroscope optical path components (2), the optical signal is subjected to optical splitting, transmission, and interference to form an interference optical signal, which is then fed back to the optical fiber gyroscope control component (1). The optical fiber gyroscope control component (1) performs photoelectric conversion to obtain an electrical signal, and processes the electrical signal.

2. The split modular three-axis integrated fiber optic gyroscope structure according to claim 1, characterized in that: The fiber optic gyroscope control component (1) comprises an erbium source component (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 respectively receive the output optical signals of the three fiber optic gyroscope optical path components (2) and convert the optical signals into electrical signals. After the electrical signals are processed by the fiber optic gyroscope digital circuit (11), they become the output of the gyroscope. The fiber optic gyroscope analog circuit (12) supplies power to the erbium source component (3) to achieve driving and temperature control of the erbium source component (3); The erbium source assembly (3) comprises a light source (32), a wavelength division multiplexer (33), a reflector (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), the erbium-doped optical fiber, the reflector (34) in sequence, returns to pass through the wavelength division multiplexer (33) again, passes through the filter (36), and the isolator (35), and becomes the output of the erbium-doped light source. The output of the erbium-doped light source passes through the first beam splitter (37). The first beam splitter (37) includes two output ends, namely, an output end 30 and an output end 70. The output end 30 serves as the light input of a fiber optic gyroscope optical path component (2), and the output end 70 serves as the input of the second beam splitter (27). The two output ends of the second beam splitter serve as the light input of another two fiber optic gyroscope optical path components (2).

3. The split modular three-axis integrated fiber optic gyroscope structure according to claim 2, characterized in that: The fiber optic gyroscope control component (1) and the erbium source component (3) share an erbium source box body (31) and a control component upper cover (13); A light source (32), a wavelength division multiplexer (33), a reflector (34), an isolator (35), a filter (36), a first beam splitter (37), and a second beam splitter (27) are mounted on the bottom surface (31-1) of an erbium source box body (31); an optical fiber gyroscope analog circuit (12) is mounted on a boss (31-2) on the bottom surface of the erbium source box body (31); an optical fiber gyroscope digital circuit (11) is mounted on a boss (31-3) on the side surface of the erbium source box body (31); and a control component upper cover (13) is mounted on the top of the erbium source box body (31).

4. The split modular three-axis integrated fiber optic gyroscope structure according to claim 2, characterized in that: 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 wiring groove for a wiring harness (4) between a fiber optic gyroscope control component (1) and a fiber optic gyroscope optical path component (2); the second groove (31-6) on the erbium source box body (31) is a wiring groove for a wiring harness of an external electrical interface of the three-axis integrated fiber optic gyroscope; and a groove (13-1) is provided inside the control component upper cover (13).

5. The split modular three-axis integrated fiber optic gyroscope structure according to claim 2, characterized in that: Large arc surfaces (31-7) are arranged at four corners of the bottom of the inner cavity of the erbium source box body (31), and the optical fiber is coiled close to the wall with a large coil radius.

6. The split modular three-axis integrated fiber optic gyroscope structure according to claim 1, characterized in that: The optical fiber gyroscope optical path component (2) comprises an optical fiber ring base (21), an optical fiber ring upper cover (22), a device base (23), an optical path component upper cover (24), an optical fiber ring (25), a Y waveguide (26), a third beam splitter (29), and a temperature sensor (28); The light entering the optical path component (2) of the fiber optic gyroscope passes through the third beam splitter (29) and then enters the single end of the Y waveguide (26). The double ends of the Y waveguide (26) are connected to the fiber optic ring (25). The light passes through the fiber optic ring and then returns to the Y waveguide (26). After passing through the third beam splitter (29), the light is transmitted back to the fiber optic gyroscope control component (1). The U-shaped groove (21-1) of the optical fiber ring base (21) is used to install the optical fiber ring (25) and is fixed by adhesive bonding; the optical fiber ring upper cover (22) is installed on the top of the optical fiber ring 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 optical fiber ring 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 component upper cover (24) is installed on the top of the device base (23).

7. The split modular three-axis integrated fiber optic gyroscope structure according to claim 6, characterized in that: In the optical fiber gyroscope optical path component (2), the optical fiber ring base (21) is provided with a fiber running groove (21-5), and the device base (23) is provided with a fiber running groove (23-1) and a fiber winding groove (23-2); the optical fibers in the optical fiber gyroscope optical path component (2) are all run close to the wall without being suspended in the air.

8. The split modular three-axis integrated fiber optic gyroscope structure according to claim 6, characterized in that: The optical fiber ring base (21) and the optical fiber ring upper cover (22) are made of iron-nickel alloy; the optical fiber ring base (21) and the optical fiber ring upper cover (22) are connected and fixed by laser welding, and overlapping stoppers are designed at the matching positions, that is, a step (21-7) is provided on the inner circle of the U-shaped groove of the optical fiber ring base (21) and a step (22-1) is provided on the outer circle of the optical fiber ring upper cover (22), and the matching gap width before welding is not greater than 0.02 mm.

9. The split modular three-axis integrated fiber optic gyroscope structure according to claim 6, characterized in that: Except for the mounting boss (21-3) and the support platform (21-6) for mounting the device base (23), all other positions of the optical fiber ring base (21) are thin-walled structures with a thickness of no more than 1 mm.

10. A split modular three-axis integrated fiber optic gyroscope junction according to claim 6, characterized in that the internal optical fiber of the wiring harness (4) between the fiber optic gyroscope control component (1) and the fiber optic gyroscope optical path component (2) is protected by a loose tube, and the optical fiber and the conductor are combined and wrapped with a polyimide film for protection.

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