Three-axis split type frameless optical fiber gyroscope

Abstract

The invention relates to a three-axis split type frameless optical fiber gyroscope, which is mainly used for solving the technical problem that the measurement precision of the three-axis integrated optical fiber gyroscope is reduced due to the fact that the existing three-axis integrated optical fiber gyroscope adopts integrated arrangement and a heat source device is easy to influence heat sensitive parts such as an optical fiber ring. The three-axis split type frameless optical fiber gyroscope comprises an outer shell, a table body, three optical fiber ring modules and a photoelectric integration module, the photoelectric integrated module is installed in a photoelectric chamber of the outer shell, the three optical fiber ring modules are installed on the table body, and the table body is placed in a table body chamber of the outer shell. A partition plate is arranged between the photoelectric chamber and the table body chamber, a separated structure is adopted, and the influence of heat generated by the photoelectric integrated module on the optical fiber ring module is prevented.

Description

Technical Field

[0001] The invention relates to a fiber optic gyroscope, in particular to a three-axis split frameless fiber optic gyroscope. Background Art

[0002] Fiber optic gyroscope is an instrument that accurately determines the direction of a moving object. It has the advantages of high sensitivity, long life, large dynamic range, and short startup time. It has been widely used in inertial navigation systems.

[0003] The three-axis integrated fiber optic gyroscope can accurately measure the angular velocity and angle change of an object in three axes, providing accurate data for inertial navigation, attitude control, etc. Compared with the single-axis fiber optic gyroscope, the three-axis integrated fiber optic gyroscope has the advantages of high integration and small size, and has gradually become the mainstream design of fiber optic gyroscopes.

[0004] In the prior art, a three-axis integrated fiber optic gyroscope is usually arranged in an integrated manner, wherein heat source devices (such as circuit boards and light sources) generate heat during operation, which increases the internal temperature of the three-axis integrated gyroscope, and components such as optical fiber rings are more sensitive to temperature changes. Temperature changes can cause physical properties such as the refractive index of the optical fiber to change, thereby affecting the measurement accuracy of the three-axis integrated fiber optic gyroscope. Summary of the invention

[0005] The purpose of the present invention is to solve the technical problem that the existing three-axis integrated fiber optic gyroscope adopts an integrated layout, in which the heat source device is easy to affect the heat-sensitive components such as the optical fiber ring, resulting in a decrease in the measurement accuracy of the three-axis integrated fiber optic gyroscope, and proposes a three-axis split frameless fiber optic gyroscope.

[0006] To solve the above technical problems, the technical solutions provided by the present invention are as follows:

[0007] A three-axis split frameless fiber optic gyroscope, which is special in that it includes an outer shell, a platform, three fiber optic ring modules, and an optoelectronic integrated module;

[0008] The outer shell includes a photoelectric chamber and a stage chamber, and a partition is provided between the photoelectric chamber and the stage chamber; the photoelectric integrated module is placed in the photoelectric chamber, and the stage is placed in the stage chamber;

[0009] The three fiber ring modules are used to measure motion data on the X, Y and Z axes respectively; each fiber ring module includes a fixed component, and a 2×2 coupler, a Y waveguide and a fiber ring installed in the fixed component; the three fixed components are respectively installed on three mutually perpendicular sides of the platform, and a heat insulation gap is set between the three fixed components and the platform;

[0010] The optoelectronic integrated module includes a light source, a 1×3 coupler, an optoelectronic component and a circuit board;

[0011] The light source is connected to the input end of the 1×3 coupler to emit an optical signal; the three output ends of the 1×3 coupler are respectively connected to one input end of three 2×2 couplers; in each optical fiber ring module, the 2×2 coupler and the Y waveguide, and the Y waveguide and the optical fiber ring are interconnected, and each 2×2 coupler is also connected to an optoelectronic component to convert the optical signal output by the corresponding optical fiber ring into an electrical signal; the optoelectronic component is connected to a circuit board, and the circuit board is used to modulate and demodulate the collected electrical signal and output the angular rate value of the optical fiber gyroscope;

[0012] The optical fiber ring comprises an inner fiber padding layer, a light-transmitting layer and an outer fiber padding layer which are sequentially arranged from the inside to the outside.

[0013] Furthermore, the three mutually perpendicular side surfaces of the platform are respectively provided with mounting grooves, and the three fixing components are respectively installed in the three mounting grooves;

[0014] The bottom surface of each mounting groove is provided with a heat-insulating boss, which is cylindrical and has a diameter smaller than the diameter of the mounting groove; the heat-insulating boss abuts against the corresponding fixing component to form a heat-insulating gap between the outer wall of the fixing component and the inner wall of the mounting groove of the platform body.

[0015] Further, each of the fixing components comprises a cover plate, a fixing shell and a mounting boss;

[0016] The cover plate is mounted on the upper end of the fixed shell, the mounting boss is located inside the fixed shell and is arranged on the bottom surface of the fixed shell; the bottom end of the fixed shell abuts against the heat insulation boss;

[0017] The diameter of the mounting boss is smaller than the diameter of the bottom surface of the fixing shell, and an optical fiber groove is formed between the mounting boss and the outer side surface of the fixing shell, and the optical fiber ring is mounted in the optical fiber groove.

[0018] Furthermore, a secondary thermal insulation boss is provided on one side of the bottom end of the fixed shell facing the mounting groove; the thermal insulation boss abuts against the secondary thermal insulation boss to form a thermal insulation gap between the outer wall of the fixed shell and the inner wall of the mounting groove of the platform body; the width of the thermal insulation gap is 1.5 mm.

[0019] Furthermore, the light source, 1×3 coupler, optoelectronic component, 2×2 coupler, Y waveguide and optical fiber ring are all connected by optical fiber fusion splicing;

[0020] The circuit board is also connected to the Y waveguide via a conductor, and is used to perform phase modulation and compensation processing on the Y waveguide;

[0021] The circuit board is connected to the wire port of the Y waveguide; and the cover plate is provided with a wire hole for passing the wire.

[0022] Furthermore, the cover plate, the mounting boss and the heat-insulating boss are provided with corresponding screw holes for passing bolts to fix the cover plate and the fixing shell in the mounting groove of the platform body.

[0023] Furthermore, the outer fiber padding layer, the light-transmitting layer and the inner fiber padding layer are all formed by winding optical fibers, and the outer fiber padding layer and the inner fiber padding layer are used to support and protect the light-transmitting layer and to provide heat insulation.

[0024] Furthermore, two shock absorbers are respectively arranged on the side of the platform body close to the partition and the opposite side thereof to eliminate vibration interference.

[0025] Furthermore, the optical fiber led out from the other input end of the 2×2 coupler is wound into an optical fiber coil with a diameter less than 1 cm, which is used to eliminate optical path deviation.

[0026] Furthermore, the optoelectronic integrated module further comprises an optoelectronic housing, the light source is mounted at the bottom of the optoelectronic housing; the 1×3 coupler is mounted above the light source, the circuit board is fixedly connected below the upper end cover of the optoelectronic housing, and the optoelectronic component is plugged below the circuit board;

[0027] The side of the optoelectronic housing is also provided with a connector, a wire outlet and a fiber outlet; one end of the connector is connected to the circuit board, and the other end is used to connect to an external device; the wire outlet is used to pass the wire; there are at least two fiber outlets, both for passing the optical fiber.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The present invention discloses a three-axis split frameless fiber optic gyroscope, comprising an outer shell, a platform, three fiber optic ring modules and an optoelectronic integrated module; the optoelectronic integrated module is installed in the optoelectronic chamber of the outer shell, the three fiber optic ring modules are installed on the platform, and the platform is placed in the platform chamber of the outer shell; a partition is provided between the optoelectronic chamber and the platform chamber, and a separate structure is adopted to prevent the heat generated by the optoelectronic integrated module from affecting the fiber optic ring module. A heat insulation gap is also provided between the fiber optic ring module and the platform to further provide heat insulation protection for the fiber optic ring module.

[0030] 2. The present invention is a three-axis split frameless fiber optic gyroscope, wherein the fiber ring includes a light-transmitting layer, an inner fiber padding layer and an outer fiber padding layer; the light-transmitting layer is located between the inner fiber padding layer and the outer fiber padding layer. The inner fiber padding layer and the outer fiber padding layer not only support and protect the light-transmitting layer, but also have a heat insulation effect, thereby ensuring the measurement accuracy of the fiber ring.

[0031] 3. The present invention is a three-axis split frameless fiber optic gyroscope, in which the optoelectronic integrated module integrates heat-generating devices such as a light source, a 1×3 coupler, optoelectronic components, and a circuit board, and is installed separately from the optical fiber ring module in an outer shell, thereby ensuring good heat insulation while achieving a miniaturized design and saving space. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a front view of an embodiment of a three-axis split frameless fiber optic gyroscope of the present invention;

[0033] Figure 2 It is a front view of a platform and a fiber ring module in an embodiment of a three-axis split frameless fiber optic gyroscope of the present invention;

[0034] Figure 3 It is a right side view of a platform and a fiber ring module in an embodiment of a three-axis split frameless fiber optic gyroscope of the present invention;

[0035] Figure 4 It is a left view of a platform and a fiber ring module in an embodiment of a three-axis split frameless fiber optic gyroscope of the present invention;

[0036] Figure 5 A top view of a platform and a fiber ring module in an embodiment of a three-axis split frameless fiber optic gyroscope of the present invention;

[0037] Figure 6 It is a structural schematic diagram of a fixed shell in an embodiment of a three-axis split frameless fiber optic gyroscope of the present invention;

[0038] Figure 7 It is a schematic diagram of the structure of an optical fiber ring in an embodiment of a three-axis split frameless optical fiber gyroscope of the present invention;

[0039] Figure 8 A cross-sectional view of an optical fiber ring in an embodiment of a three-axis split frameless optical fiber gyroscope of the present invention;

[0040] Fig. 9 It is an enlarged view of the thermal insulation gap in an embodiment of a three-axis split frameless fiber optic gyroscope of the present invention;

[0041] Fig.10 It is a structural schematic diagram of an optoelectronic integrated module in an embodiment of a three-axis split frameless fiber optic gyroscope of the present invention (circuit board omitted);

[0042] Fig.11 This is a data curve of a traditional integrated fiber optic gyroscope under normal temperature conditions;

[0043] Fig.12 It is a data curve diagram under normal temperature conditions in an embodiment of a three-axis split frameless fiber optic gyroscope of the present invention;

[0044] Fig.13 This is a data curve of a traditional integrated fiber optic gyroscope under low temperature conditions;

[0045] Fig.14A data curve diagram of a three-axis split frameless fiber optic gyroscope under low temperature conditions in an embodiment of the present invention;

[0046] Fig.15 This is a data curve of a traditional integrated fiber optic gyroscope under high temperature conditions;

[0047] Fig.16 A data curve diagram of a three-axis split frameless fiber optic gyroscope under high temperature conditions in an embodiment of the present invention;

[0048] Fig.17 It is a data curve diagram of the traditional integrated fiber optic gyroscope under variable temperature conditions;

[0049] Fig.18 The present invention is a data curve diagram of a three-axis split frameless fiber optic gyroscope under variable temperature conditions.

[0050] Description of reference numerals:

[0051] 1. Outer shell; 11. Photoelectric chamber; 12. Platform chamber; 13. Partition; 2. Platform; 21. Shock absorber; 22. Thermal insulation gap; 23. Thermal insulation boss; 3. Fiber optic ring module; 30. Fiber optic ring; 301. Outer fiber padding layer; 302. Light-transmitting layer; 303. Inner fiber padding layer; 31. Cover plate; 33. Fixed shell; 34. Mounting boss; 341. Auxiliary thermal insulation boss; 35. Fiber optic groove; 36. 2×2 coupler; 37. Y waveguide; 38. Screw hole; 39. Wire hole; 4. Optoelectronic integrated module; 41. Light source; 42. 1×3 coupler; 43. Optoelectronic assembly; 44. Optoelectronic shell; 5. Optical fiber; 6. Wire. DETAILED DESCRIPTION

[0052] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0053] The present invention provides a three-axis split frameless fiber optic gyroscope, such as Figure 1 to Figure 5 As shown, it includes an outer shell 1, a platform, three optical fiber ring modules 3, an optoelectronic integration module 4, and optical fibers 5 and wires 6.

[0054] like Figure 1 As shown, the outer shell 1 includes an optoelectronic chamber 11 and a stage chamber 12, a partition 13 is provided between the optoelectronic chamber 11 and the stage chamber 12, an optoelectronic integrated module 4 is placed in the optoelectronic chamber 11, three optical fiber ring modules 3 are mounted on the stage 2, and the stage 2 is placed in the stage chamber 12. The optoelectronic integrated module 4 is connected to the three optical fiber ring modules 3 through optical fibers 5, respectively, for transmitting the optical signals generated by the light source 41 in the optoelectronic integrated module 4 to the three optical fiber ring modules 3, respectively, and receiving the output signals of the three optical fiber ring modules 3. The optoelectronic integrated module 4 is also connected to the three optical fiber ring modules 3 through wires 6, respectively, for phase modulation.

[0055] like Figure 2 to Figure 5 As shown, the platform 2 is a cubic structure, and three mutually perpendicular sides of the platform 2 are respectively provided with mounting grooves for mounting the optical fiber ring module 3. Fig. 9 As shown, the bottom surface of each mounting groove is provided with a heat-insulating boss 23, which is cylindrical and has a diameter smaller than the diameter of the mounting groove. Two shock absorbers 21 are respectively provided on the side of the platform 2 close to the partition 13 and the opposite side thereof, and the two shock absorbers 21 are respectively fixedly connected to two positions near the top corners of the side of the platform 2 by bolts.

[0056] like Figure 6 to Figure 9 As shown, the three optical fiber ring modules 3 have the same structure, and each optical fiber ring module 3 includes a 2×2 coupler 36, a Y waveguide 37, an optical fiber ring 30 and a fixing component.

[0057] The 2×2 coupler 36 includes two input ends and two output ends, wherein one input end is connected to the optoelectronic integrated module 4 via an optical fiber 5, and the other input end leads out a section of the optical fiber 5 and is wound into an optical fiber coil with a diameter less than 1 cm to eliminate deviation. One output end of the 2×2 coupler 36 is connected to the input end of the Y waveguide 37 via an optical fiber 5, and the other output end is connected to the optoelectronic integrated module 4 via an optical fiber 5.

[0058] The Y-waveguide 37 is used for light splitting, light combining and modulation; the two output ends of the Y-waveguide 37 are respectively connected to the two ports of the optical fiber ring 30, and the Y-waveguide 37 divides the received optical signal into two paths and transmits them to the optical fiber ring 30, and transmits them in opposite directions in the optical fiber ring 30. As the three-axis split-type skeleton-free optical fiber gyroscope rotates, the two optical signals produce a phase difference and enter the Y-waveguide 37 from the two output ends of the Y-waveguide 37 for beam combining to form an output signal, and is transmitted from one output end of the 2×2 coupler 36 to the 2×2 coupler 36, and is transmitted from the other output end of the 2×2 coupler 36 to the optoelectronic integrated module 4 for subsequent processing.

[0059] The fixing assembly is cylindrical and includes a cover plate 31 (see Figure 2 ), a fixed shell 33 and a mounting boss 34. The fixed shell 33 is a cylindrical structure with one end open, and the inner bottom surface is coaxially provided with a mounting boss 34. A fiber groove 35 is formed between the outer side surface of the mounting boss 34 and the inner side surface of the fixed shell 33, and the fiber ring 30 is installed in the fiber groove 35. The mounting boss 34 is also provided with a first mounting groove and a second mounting groove, and the 2×2 coupler 36 is installed in the first mounting groove, and the Y waveguide 37 is installed in the second mounting groove. A secondary heat insulation boss 341 is also provided on the outer wall of the bottom end of the fixed shell 33. Fig. 9As shown, the fixed shell 33 is installed in the installation groove of the platform 2, the heat insulation boss 23 is abutted against the auxiliary heat insulation boss 341, and a heat insulation gap 22 is formed between the outer wall of the fixed shell 33 and the inner wall of the installation groove of the platform 2, so that the heat propagation of the platform 2 cannot be transmitted to the optical fiber ring 30 by contact conduction, thereby improving the heat insulation effect. In this embodiment, the width of the heat insulation gap 22 is 1.5 mm.

[0060] Reference Figure 2 The cover plate 31 is mounted on the upper end of the fixed shell 33, and corresponding screw holes 38 are provided on the cover plate 31, the mounting boss 34 and the heat-insulating boss 23, through which bolts are passed to fix the cover plate 31 and the fixed shell 33 in the mounting groove of the platform body 2. The cover plate 31 is also provided with a wire hole 39, one end of the wire 6 is connected to the optoelectronic integrated module 4, and the other end passes through the wire hole 39 and is connected to the wire port of the Y waveguide 37 for phase modulation.

[0061] like Figure 7 , Figure 8 As shown, the optical fiber ring 30 includes an inner fiber padding layer 303, a light-transmitting layer 302 and an outer fiber padding layer 301 which are arranged in sequence from the inside to the outside. The light-transmitting layer 302 is wound by the optical fiber 5. In this embodiment, the light-transmitting layer 302 is a three-layer structure. The inner fiber padding layer 303 and the outer fiber padding layer 301 are mainly used to support and protect the light-transmitting layer 302, and also have a heat insulation effect.

[0062] like Fig.10 As shown, the optoelectronic integrated module 4 includes an optoelectronic housing 44 , and a light source 41 , a 1×3 coupler 42 , an optoelectronic component 43 and a circuit board installed in the optoelectronic housing 44 .

[0063] The light source 41 is installed at the bottom of the photoelectric housing; the light source 41 is connected to the input end of the 1×3 coupler 42 for emitting an optical signal. The 1×3 coupler 42 is installed above the light source. The 1x3 coupler 42 includes three output ends for dividing the optical signal into three parts according to the coupling ratio, and is respectively used to provide optical signals for the optical fiber ring modules 3 on the X-axis, Y-axis and Z-axis. The three output ends of the 1x3 coupler 42 are respectively connected to the input ends of the 2×2 couplers 36 in the three optical fiber ring modules 3 through optical fibers 5. The optoelectronic component 43 is connected to the other output end of the 2×2 coupler 36 for converting the optical signal output by the optical fiber ring 30 into an electrical signal. The circuit board is fixedly connected to the bottom of the upper end cover of the photoelectric housing 44, and the optoelectronic component 43 is plugged under the circuit board to transmit the electrical signal to the circuit board, which modulates and demodulates it and outputs the angular velocity value of the optical fiber gyroscope. The circuit board is also connected to one end of the wire 6, and the other end of the wire 6 passes through the wire hole 39 and is connected to the wire port of the Y waveguide 37. The Y waveguide 37 is phase modulated according to the angular velocity and angular displacement, thereby compensating for the non-reciprocal phase shift of the optical fiber ring 30 caused by factors such as temperature and light source power fluctuations. The side of the optoelectronic housing 44 is also provided with a connector, a wire outlet, and a fiber outlet; one end of the connector is connected to the circuit board, and the other end is used to connect to an external device; the wire outlet is used to pass the wire 6; the number of the fiber outlets is at least two, both of which are used to pass the optical fiber 5.

[0064] A comparative test was conducted on a three-axis split frameless fiber optic gyroscope of the present invention and a traditional integrated fiber optic gyroscope, and the test temperatures were controlled to be normal temperature, low temperature, high temperature and variable temperature. The experimental process is as follows:

[0065] 1. Normal temperature test:

[0066] Test conditions:

[0067] Ambient temperature: (+25±2)℃; Relative humidity: 20%~80%; Atmospheric pressure: test site pressure.

[0068] Test method: Fix the three-axis split frameless fiber optic gyroscope of the present invention and the traditional integrated fiber optic gyroscope in a hexahedron test fixture, and place the hexahedron test fixture horizontally on a flat plate. Power on the three-axis split frameless fiber optic gyroscope of the present invention and the traditional integrated fiber optic gyroscope for 40 minutes. The test results are as follows: Fig.11 , Fig.12 As shown, the yellow curve represents the output data on the X-axis, the blue curve represents the output data on the Y-axis, and the green curve represents the output data on the Z-axis. The curve of the traditional integrated fiber optic gyroscope has large noise and obvious zero deviation, while the curve of the three-axis split frameless fiber optic gyroscope of the present invention is relatively smooth, with low noise, small zero deviation, and no obvious drift phenomenon.

[0069] 2. Extreme temperature electrical test

[0070] Test conditions:

[0071] Temperature points: low temperature (-45±2)℃, high temperature (+70±2)℃; relative humidity: 20%~80%; atmospheric pressure: the air pressure of the test site.

[0072] Test method: fix the three-axis split frameless fiber optic gyroscope of the present invention and the traditional integrated fiber optic gyroscope in a hexahedron test fixture, place the hexahedron test fixture horizontally in the incubator flat plate, turn on the incubator, keep the temperature for 2 hours when the incubator reaches the temperature point, then power on the three-axis split frameless fiber optic gyroscope of the present invention and the traditional integrated fiber optic gyroscope for 40 minutes. The test results are as follows: Fig.13 , Fig.14 As shown in the figure, it is a curve diagram under low temperature conditions. Fig.15 , Fig.16 The graph is a curve under high temperature conditions. The curve of the traditional integrated fiber optic gyroscope has obvious noise and zero position deviation, while the curve of the three-axis split frameless fiber optic gyroscope of the present invention has relatively small noise and zero position deviation.

[0073] 3. Full temperature continuous temperature test

[0074] Test conditions:

[0075] Temperature range: (-45±2)℃~(+70±2)℃; Relative humidity: 20%~80%; Atmospheric pressure: test site pressure.

[0076] Test method:

[0077] A three-axis split frameless fiber optic gyroscope of the present invention and a traditional integrated fiber optic gyroscope are respectively fixed in a hexahedral test fixture, the hexahedral test fixture is horizontally placed in an incubator flat plate, the incubator is turned on and the incubator program is controlled, and the three-axis split frameless fiber optic gyroscope of the present invention and the traditional integrated fiber optic gyroscope are powered on for testing.

[0078] The temperature box program settings are as follows:

[0079] 1) The temperature box is set at 20℃ and kept warm for 20 minutes;

[0080] 2) The temperature in the incubator is lowered to -45°C at a temperature change rate of 0.5°C / min and kept at this temperature for 2 hours;

[0081] 3) Raise the temperature in the incubator to 70°C at a temperature gradient of 0.5°C / min and keep it at that temperature for 2 hours.

[0082] The test results of the three-axis split frameless fiber optic gyroscope and the traditional integrated fiber optic gyroscope in the temperature chamber are as follows: Fig.17 , Fig.18 As shown, the curve graph of the traditional integrated fiber optic gyroscope has obvious fluctuations and noise, while the curve graph of the three-axis split frameless fiber optic gyroscope of the present invention has less noise and no obvious drift phenomenon.

[0083] As shown in Table 1, the zero bias stability data of the X-axis, Y-axis and Z-axis of a three-axis split frameless fiber optic gyroscope of the present invention and a traditional integrated fiber optic gyroscope under normal temperature, low temperature, high temperature and variable temperature test conditions are shown.

[0084] Table 1

[0085]

[0086] Table 1 shows that the zero bias stability of the three-axis split frameless fiber optic gyroscope of the present invention on the X, Y, and Z axes is relatively good.

Claims

1. A three-axis split frameless fiber optic gyroscope, characterized in that: It comprises an outer shell (1), a platform (2), three optical fiber ring modules (3), and an optoelectronic integrated module (4); The outer shell (1) comprises a photoelectric chamber (11) and a stage chamber (12), and a partition (13) is provided between the photoelectric chamber (11) and the stage chamber (12); the photoelectric integrated module (4) is placed in the photoelectric chamber (11), and the stage (2) is placed in the stage chamber (12); The three optical fiber ring modules (3) are used to measure motion data on the X, Y and Z axes respectively; each optical fiber ring module (3) comprises a fixed component, and a 2×2 coupler (36), a Y waveguide (37) and an optical fiber ring (30) installed in the fixed component; the three fixed components are respectively installed on three mutually perpendicular side surfaces of the platform (2), and a heat insulation gap (22) is provided between the three fixed components and the platform (2); The optoelectronic integrated module (4) comprises a light source (41), a 1×3 coupler (42), an optoelectronic component (43) and a circuit board; The light source (41) is connected to the input end of the 1×3 coupler (42) for emitting an optical signal; the three output ends of the 1×3 coupler (42) are respectively connected to one input end of three 2×2 couplers (36); in each optical fiber ring module (3), the 2×2 coupler (36) and the Y waveguide (37), and the Y waveguide (37) and the optical fiber ring (30) are all connected to each other, and each 2×2 coupler (36) is also connected to an optoelectronic component (43) for converting an optical signal output by the corresponding optical fiber ring (30) into an electrical signal; the optoelectronic component (43) is connected to a circuit board, and the circuit board is used to modulate and demodulate the collected electrical signal and output an angular velocity value of the optical fiber gyroscope; The optical fiber ring (30) comprises an inner fiber padding layer (303), a light-transmitting layer (302) and an outer fiber padding layer (301) which are arranged in sequence from the inside to the outside.

2. The three-axis split frameless fiber optic gyroscope according to claim 1, characterized in that: The platform (2) is provided with mounting grooves on three mutually perpendicular side surfaces, and the three fixing components are respectively mounted in the three mounting grooves; The bottom surface of each installation groove is provided with a heat-insulating boss (23), which is cylindrical and has a diameter smaller than the diameter of the installation groove; the heat-insulating boss (23) abuts against the corresponding fixing component, so that a heat-insulating gap (22) is formed between the outer wall of the fixing component and the inner wall of the installation groove of the platform body (2).

3. A three-axis split frameless fiber optic gyroscope according to claim 2, characterized in that: Each of the fixing components comprises a cover plate (31), a fixing shell (33) and a mounting boss (34); The cover plate (31) is mounted on the upper end of the fixed shell (33); the mounting boss (34) is located inside the fixed shell (33) and is arranged on the bottom surface of the fixed shell (33); the bottom end of the fixed shell (33) abuts against the heat-insulating boss (23); The diameter of the mounting boss (34) is smaller than the diameter of the bottom surface of the fixing shell (33), and an optical fiber groove (35) is formed between the mounting boss and the outer side surface of the fixing shell (33), and the optical fiber ring (30) is mounted in the optical fiber groove (35).

4. The three-axis split frameless fiber optic gyroscope according to claim 3, characterized in that: A secondary heat-insulating boss (341) is provided on one side of the bottom end of the fixed shell (33) facing the mounting groove; the heat-insulating boss (23) abuts against the secondary heat-insulating boss (341), so that a heat-insulating gap (22) is formed between the outer wall of the fixed shell (33) and the inner wall of the mounting groove of the platform body (2); the width of the heat-insulating gap (22) is 1.5 mm.

5. The three-axis split frameless fiber optic gyroscope according to claim 4, characterized in that: The light source (41), the 1×3 coupler (42), the optoelectronic component (43), the 2×2 coupler (36), the Y waveguide (37) and the optical fiber ring (30) are all fused via the optical fiber (5); The circuit board is also connected to the Y waveguide (37) via a conductor (6) for performing phase modulation and compensation processing on the Y waveguide; The circuit board is connected to the wire port of the Y waveguide (37); and the cover plate (31) is provided with a wire hole (39) for passing the wire (6).

6. The three-axis split frameless fiber optic gyroscope according to claim 5, characterized in that: The cover plate (31), the mounting boss (34) and the heat-insulating boss (23) are provided with corresponding screw holes (38) for passing bolts to fix the cover plate (31) and the fixing shell (33) in the mounting groove of the platform body (2).

7. The three-axis split frameless fiber optic gyroscope according to claim 6, characterized in that: The outer fiber padding layer (301), the light-transmitting layer (302) and the inner fiber padding layer (303) are all formed by winding optical fibers (5); the outer fiber padding layer (301) and the inner fiber padding layer (303) are used to support and protect the light-transmitting layer (302) and to provide heat insulation.

8. The three-axis split frameless fiber optic gyroscope according to claim 7, characterized in that: Two shock absorbers (21) are respectively arranged on the side of the platform (2) close to the partition (13) and the opposite side thereof, for eliminating vibration interference.

9. The three-axis split frameless fiber optic gyroscope according to claim 8, characterized in that: The optical fiber (5) led out from the other input end of the 2×2 coupler (36) is wound into an optical fiber coil with a diameter less than 1 cm, which is used to eliminate optical path deviation.

10. The three-axis split frameless fiber optic gyroscope according to claim 9, characterized in that: The optoelectronic integrated module (4) further comprises an optoelectronic housing (44), the light source (41) being mounted at the bottom of the optoelectronic housing (44); the 1×3 coupler (42) being mounted above the light source (41); the circuit board being fixedly connected below the upper end cover of the optoelectronic housing (44); and the optoelectronic component (43) being plugged below the circuit board; The side of the optoelectronic housing (44) is also provided with a connector, a wire outlet and a fiber outlet; one end of the connector is connected to the circuit board, and the other end is used to connect to an external device; the wire outlet is used to pass the wire; the fiber outlet is at least two in number, both used to pass the optical fiber (5).

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