Device and method for improving performance of high-precision fiber-optic gyroscope system

Abstract

The invention provides a device and a method for improving the performance of a high-precision fiber-optic gyroscope system. The polarization-maintaining circulator is connected with the light source through an optical fiber; and a first coupler. According to the device and the method for improving the system performance of the high-precision fiber-optic gyroscope, the detection sensitivity of the fiber-optic gyroscope can be doubled under the condition of the same volume through the optical multiplication system, and the temperature performance, the light stress effect and the winding difficulty of the fiber-optic ring are not changed; the influence of relative intensity noise on the performance of the high-precision fiber-optic gyroscope can be effectively reduced through autocorrelation intensity superposition of interference light and idle reference light, the performance of the high-precision fiber-optic gyroscope is improved only through light path design, and higher reliability is achieved; an optical multiplication system is combined with a relative intensity noise suppression system, so that the comprehensive performance of the high-precision fiber-optic gyroscope can be greatly improved, and the high-precision fiber-optic gyroscope is relatively low in cost, simple to assemble and easy to apply to batch production.

Description

Technical Field

[0001] The present invention relates to the field of inertial navigation technology, and in particular to a device and method for improving the performance of a high-precision fiber optic gyroscope system. Background Art

[0002] As an inertial device that can navigate autonomously without relying on external information, fiber optic gyroscope has been widely used in automobile navigation, intelligent robot control and oil directional drilling technology due to its small size, high precision and strong reliability.

[0003] However, the precision performance of fiber optic gyroscopes is limited by factors such as its own electrical noise, shot noise, and relative intensity noise, which restricts the development of high-performance fiber optic gyroscopes. Among them, electrical noise and shot noise are inherent in the components of the fiber optic gyroscope, and it is difficult to suppress such noise. The relative intensity noise suppression method has become one of the important methods to improve the performance of fiber optic gyroscopes. In addition, the commonly used methods to improve the precision performance of fiber optic gyroscopes include increasing the ring length and improving the signal processing algorithm. However, the increase in the ring length will greatly increase the difficulty of fiber ring winding, and the temperature performance will also drop sharply, resulting in unfavorable factors such as larger product size. Improvements in signal processing algorithms can effectively improve the precision performance of fiber optic gyroscopes, but this method is difficult to use and requires adjustment of the software algorithm according to the specific use environment of the fiber optic gyroscope, making it difficult to directly apply it in batches.

[0004] Therefore, it is necessary to provide a device and method for improving the performance of a high-precision fiber optic gyroscope system to solve the above technical problems. Summary of the invention

[0005] The present invention provides a device and method for improving the performance of a high-precision fiber optic gyroscope system, which solves the problems of difficulty in suppressing relative noise, difficulty in coiling fibers, temperature drop, large size, and difficulty in batch application.

[0006] In order to solve the above technical problems, the present invention provides a device for improving the performance of a high-precision fiber optic gyroscope system, comprising:

[0007] light source;

[0008] A polarization-maintaining circulator, wherein the polarization-maintaining circulator is connected to the light source via an optical fiber;

[0009] A first coupler, wherein the first coupler is connected to the polarization-maintaining circulator via an optical fiber;

[0010] A 45° fusion point, wherein the 45° fusion point is connected to the first coupler via an optical fiber;

[0011] A polarization beam splitter, wherein the polarization beam splitter is connected to the 45° fusion point via an optical fiber, the polarization beam splitter is also connected to an electro-optic phase modulator, an optical fiber ring and a polarization-maintaining Faraday rotator via an optical fiber, and the electro-optic phase modulator and the optical fiber ring are also connected via an optical fiber;

[0012] A second coupler, wherein the second coupler is connected to the polarization-maintaining circulator via an optical fiber, the second coupler is also connected to a detector and a 90° fusion point via an optical fiber, and the 90° fusion point is connected to the first coupler via an optical fiber.

[0013] Preferably, both the first coupler and the second coupler are 1×2 couplers, and the splitting ratio between the first coupler and the second coupler is 90:10.

[0014] To solve the above problems, the present invention also provides a method for improving the performance of a high-precision fiber optic gyroscope system, comprising the following steps:

[0015] S1, the light source emits irregular polarized light which is modulated into linear polarized light by a polarization-maintaining circulator;

[0016] S2, the polarization-maintaining circulator modulates the orthogonal linear polarization light carrying interference information returned from the optical fiber ring into linear polarization light parallel to the main axis of the polarization-maintaining circulator;

[0017] S3, the main axis of the first coupler pigtail is fused at 45° with the main axis of the polarization beam splitter pigtail, and the linear polarized light is equally divided into linear polarized light parallel and perpendicular to the main axis of the polarization beam splitter after passing through the 45° fusion point, and the idle reference light transmitted by the first coupler is transmitted through the slow axis of the second coupler pigtail;

[0018] S4, the polarization-maintaining Faraday rotator mirror cooperates with the polarization beam splitter to make mutually orthogonal linear polarized lights pass through the optical fiber ring twice respectively;

[0019] S5, an electro-optical phase modulator modulates the optical signal entering the optical fiber ring;

[0020] S6, 45° fusion point, polarization beam splitter, electro-optic phase modulator, fiber ring and polarization-maintaining Faraday rotator constitute the optical path multiplication system;

[0021] S7, the polarization-maintaining circulator, the first coupler and the second coupler constitute a relative intensity noise suppression system;

[0022] S8. The detector receives the optical signal obtained by coupling the autocorrelation intensity of the fiber optic gyroscope interference light and the idle reference light through the second coupler. The difference between the interference light and the reference light during the transmission process will be reflected in the change of the noise amplitude in the digital closed-loop system. The electro-optical phase modulator is controlled to perform feedback compensation on the optical signal, and finally the relative intensity noise is suppressed.

[0023] Preferably, the polarization beam splitter includes a polarization beam splitter body, connecting frames are provided at both ends of the side surfaces of the polarization beam splitter, slide grooves are provided at the tops of both sides of the inner side surfaces of the two connecting frames, and positioning grooves are provided at the tops of the inner side surfaces of the slide grooves. A top cover is provided on the top of the polarization beam splitter body, and a pressure plate is provided on the top of the top cover. Both ends of the pressure plate are fixedly installed with clamping plates, and the clamping plates are slidably connected to the inner side surfaces of the slide grooves. A first groove is provided on the top of the pressure plate, and a second groove is provided on the bottom of the pressure plate. The internal thread of the pressure plate is connected with a first threaded rod, a rotating plate is fixedly installed on the top of the first threaded rod, and a contact plate is rotatably connected to the bottom of the first threaded rod.

[0024] Preferably, a sealing gasket is fixedly mounted on the bottom of the top cover, and the bottom of the sealing gasket abuts against the top of the polarization beam splitter body.

[0025] Preferably, sliding sleeves are fixedly mounted on both ends of both sides of the top cover, and the sliding sleeves are slidably connected to the outer side surface of the connecting frame.

[0026] Preferably, the bottom of the abutment plate abuts against the top of the top cover.

[0027] Preferably, the polarization-maintaining circulator comprises a polarization-maintaining circulator body, both ends of which are fixedly mounted with connecting tubes, and the outer side surfaces of the connecting tubes are sleeved with rubber sleeves.

[0028] Preferably, placement grooves are provided on the top and bottom of the inner side of the connecting tube, a clamping plate is provided on the inner side of the placement groove, a second threaded rod is rotatably connected to one side of the clamping plate, and the second threaded rod is threadedly connected to the inside of the connecting tube.

[0029] Preferably, a push plate is fixedly mounted on one end of the second threaded rod.

[0030] Compared with the related art, the device and method for improving the performance of a high-precision fiber optic gyroscope system provided by the present invention have the following beneficial effects:

[0031] The present invention provides a device and method for improving the performance of a high-precision fiber optic gyroscope system. The optical multiplication system can double the detection sensitivity of the fiber optic gyroscope under the same volume condition, and the temperature performance, optical stress effect and winding difficulty of the fiber ring are not changed.

[0032] The influence of relative intensity noise on the performance of high-precision fiber optic gyroscope can be effectively reduced by superimposing the autocorrelation intensity of interference light and idle reference light, and the performance of high-precision fiber optic gyroscope can be improved only by optical path design, which has higher reliability.

[0033] Combining the optical multiplication system with the relative intensity noise suppression system can greatly improve the comprehensive performance of the high-precision fiber optic gyroscope, with low cost, simple assembly and easy application in mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic structural diagram of a first embodiment of a device for improving the performance of a high-precision fiber optic gyroscope system provided by the present invention;

[0035] Figure 2 for Figure 1 The schematic diagram of the connection of the four fiber output ports of the polarization beam splitter is shown;

[0036] Figure 3 for Figure 1 A schematic diagram showing the connection between the first coupler and the second coupler fiber outlet ports;

[0037] Figure 4 for Figure 1 The optical path connection diagram of the device for improving the performance of high-precision fiber optic gyroscope is shown;

[0038] Figure 5 A schematic structural diagram of a second embodiment of a device for improving the performance of a high-precision fiber optic gyroscope system provided by the present invention;

[0039] Figure 6 for Figure 5 Another perspective structural schematic diagram shown;

[0040] Figure 7 for Figure 6 An enlarged schematic diagram of part A is shown;

[0041] Figure 8 for Figure 5 The schematic diagram of the side cross-sectional structure of the pressing plate shown;

[0042] Fig. 9 A schematic structural diagram of a third embodiment of a device for improving the performance of a high-precision fiber optic gyroscope system provided by the present invention;

[0043] Fig.10 for Fig. 9 An enlarged schematic diagram of part B is shown.

[0044] Numbers in the figure: 1, light source, 2, polarization-maintaining circulator, 3, first coupler, 4, 45° fusion point, 5, polarization beam splitter, 6, electro-optic phase modulator, 7, optical fiber ring, 8, 90° fusion point, 9, second coupler, 10, polarization-maintaining Faraday rotator, 11, detector, 51, polarization beam splitter body, 52, pressure plate, 53, top cover, 531, sealing gasket, 54, connecting frame, 55, slide groove, 56, positioning groove, 57, sliding sleeve, 58, clamping plate, 59, first groove, 50, second groove, 511, first threaded rod, 512, abutting plate, 513, rotating plate, 21, polarization-maintaining circulator body, 22, connecting tube, 23, placement groove, 24, second threaded rod, 25, pushing plate, 26, clamping plate, 27, rubber sleeve. DETAILED DESCRIPTION

[0045] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0046] First embodiment

[0047] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 ,in, Figure 1 A schematic structural diagram of a first embodiment of a device for improving the performance of a high-precision fiber optic gyroscope system provided by the present invention; Figure 2 for Figure 1 The schematic diagram of the connection of the four fiber output ports of the polarization beam splitter is shown; Figure 3 for Figure 1 A schematic diagram showing the connection between the first coupler and the second coupler fiber outlet ports; Figure 4 for Figure 1 A schematic diagram of optical path connection of a device for improving the performance of a high-precision fiber optic gyroscope is shown. A device and method for improving the performance of a high-precision fiber optic gyroscope system include: a light source 1;

[0048] A polarization-maintaining circulator 2, wherein the polarization-maintaining circulator 2 is connected to the light source 1 via an optical fiber;

[0049] A first coupler 3, wherein the first coupler 3 is connected to the polarization-maintaining circulator 2 via an optical fiber;

[0050] A 45° fusion point 4, wherein the 45° fusion point 4 is connected to the first coupler 3 via an optical fiber;

[0051] A polarization beam splitter 5, wherein the polarization beam splitter 5 is connected to the 45° fusion point 4 via an optical fiber, and the polarization beam splitter 5 is also connected to an electro-optic phase modulator 6, an optical fiber ring 7 and a polarization-maintaining Faraday rotator 10 via an optical fiber, and the electro-optic phase modulator 6 and the optical fiber ring 7 are also connected via an optical fiber;

[0052] The second coupler 9 is connected to the polarization-maintaining circulator 2 via an optical fiber. The second coupler 9 is also connected to a detector 11 and a 90° fusion point 8 via an optical fiber. The 90° fusion point 9 is connected to the first coupler 3 via an optical fiber.

[0053] The first coupler 3 and the second coupler 9 are both 1×2 couplers, and the splitting ratio between the first coupler 3 and the second coupler 9 is 90:10.

[0054] The light source 1 is connected to the polarization-maintaining circulator 2 through a single-mode optical fiber, and the other components are connected using polarization-maintaining optical fibers. The first coupler 3 is connected to the polarization-maintaining circulator 2, the polarization beam splitter 5 pigtail fiber main axis 45° fusion point 4 and the second coupler 9 pigtail fiber main axis 90° fusion point 8, the polarization beam splitter 5 is connected to the polarization-maintaining Faraday rotator 10, the electro-optic phase modulator 6 and the optical fiber ring 7, and except for the 45° fusion point 4 and the 90° fusion point 8, the pigtail fibers of the other polarization-maintaining components are fused at 0°;

[0055] like Figure 1 As shown, light source 1 uses an ASE light source with a wavelength of 1550nm. ASE emits irregular polarized light (non-polarized light), which is modulated into linearly polarized light by a polarization-maintaining circulator. The orthogonal linearly polarized light signal that obtains non-reciprocal interference information through the optical fiber ring is modulated into linearly polarized light parallel to the main axis.

[0056] Under the condition that the length of the optical fiber ring is limited, an optical path multiplication system is formed by a 45° fusion point 4, a polarization beam splitter 5, an electro-optical phase modulator 6, an optical fiber ring 7 and a polarization-maintaining Faraday rotator 10;

[0057] The connection diagram of the four fiber output ports of the polarization beam splitter 5 is as follows: Figure 2 As shown, the 45° fusion point 4 is connected to the end a of the polarization beam splitter 5, the end b is connected to the polarization-maintaining Faraday rotator 10, the end c is connected to the electro-optical phase modulator 6, and the end d is connected to the optical fiber ring 7;

[0058] The linear polarized light passing through the coupler passes through the 45° fusion point 4 and is equally divided into linear polarized light parallel to and perpendicular to the main axis of the polarization beam splitter 5. The linear polarized light parallel to the main axis of the polarization beam splitter 5 enters from the a end and is emitted from the c end. After being modulated by the electro-optic phase modulator 6, it passes through the optical fiber ring 7 clockwise and enters the d end and is emitted from the b end. After entering the polarization-maintaining Faraday rotator 10, it is modulated into linear polarized light perpendicular to the main axis of the polarization beam splitter 5 and is reflected to the b end, and is emitted from the c end. After passing through the electro-optic phase modulator 6, it reaches the d end clockwise and is finally emitted from the a end. Similarly, after passing through the 45° fusion point 4, the linear polarized light perpendicular to the main axis of the polarization beam splitter 5 passes through the optical fiber ring 7 counterclockwise twice.

[0059] The polarization-maintaining circulator 2, the first coupler 3 and the second coupler 9 constitute a relative intensity noise suppression system, which utilizes the scheme of superposition of the autocorrelation intensity of the fiber optic gyroscope interference light and the idle reference light to reduce the relative intensity noise at the eigenfrequency of the fiber optic gyroscope;

[0060] The schematic diagram of the connection between the first coupler 3 and the second coupler 9 fiber outlet ports is as follows: Figure 3 As shown, the first coupler 3 and the second coupler 9 are of 1×2 type, with a splitting ratio of 90:10, the 90-port pigtail of the first coupler 3 is fused with the a-end pigtail of the polarization beam splitter 5 at a 45° main axis, and the 10-port pigtail of the first coupler 3 is fused with the pigtail of the second coupler 9 at a 90° main axis;

[0061] The polarization-maintaining circulator 2 modulates the ASE light source output light and the orthogonal linearly polarized light signal carrying the non-reciprocal interference information into linearly polarized light parallel to the main axis, and transmits it into the second coupler 3. After passing through the 90° fusion point 8, the reference light changes from propagating along the fast axis of the polarization-maintaining optical fiber to propagating along the slow axis. The coherent light and the idle reference light are coupled and superimposed on the autocorrelation intensity and enter the detector 11. Since the interference light and the reference light have different paths, the phase difference that will appear during the transmission process will be reflected in the change of the noise amplitude in the digital closed-loop system. The optical signal is feedback compensated by synchronously controlling the electro-optical phase modulator 6, and finally the relative intensity noise is suppressed.

[0062] The present invention adopts a method of combining an optical multiplication system with a relative intensity noise suppression system to enhance the detection sensitivity of the fiber optic gyroscope and reduce the interference of noise signals on the required signal. The signal processing algorithm and the hardware circuit design are not changed. The performance of the high-precision fiber optic gyroscope can be improved only by changing the optical path, achieving a good relative intensity noise compensation effect, and greatly improving the comprehensive performance of the high-precision fiber optic gyroscope.

[0063] To solve the above problems, the present invention also provides a method for improving the performance of a high-precision fiber optic gyroscope system, comprising the following steps:

[0064] S1, light source 1 emits irregular polarized light which is modulated into linear polarized light by polarization-maintaining circulator 2;

[0065] S2, the polarization-maintaining circulator 2 modulates the orthogonal linear polarization light carrying interference information returned from the optical fiber ring 7 into linear polarization light parallel to the main axis of the polarization-maintaining circulator;

[0066] S3, the pigtail of the first coupler 3 is fused with the pigtail of the polarization beam splitter 5 at 45°, and the linear polarized light is equally divided into linear polarized light parallel to and perpendicular to the main axis of the polarization beam splitter 5 after passing through the 45° fusion point 4, and the idle reference light transmitted by the first coupler 3 is transmitted through the slow axis of the pigtail of the second coupler 9;

[0067] S4, the polarization-maintaining Faraday rotator 10 cooperates with the polarization beam splitter 5 to make mutually orthogonal linear polarized lights pass through the optical fiber ring twice respectively;

[0068] S5, electro-optical phase modulator 6 modulates the optical signal entering the optical fiber ring;

[0069] S6, 45° fusion point 4, polarization beam splitter 5, electro-optic phase modulator 6, optical fiber ring 7 and polarization-maintaining Faraday rotator 10 constitute an optical path multiplication system;

[0070] S7, the polarization-maintaining circulator 2, the first coupler 3 and the second coupler 4 constitute a relative intensity noise suppression system;

[0071] S8. The detector receives the optical signal obtained by coupling the autocorrelation intensity of the fiber optic gyroscope interference light and the idle reference light through the second coupler 9. The difference between the interference light and the reference light during the transmission process will be reflected in the change of the noise amplitude in the digital closed-loop system. The electro-optical phase modulator is controlled to perform feedback compensation on the optical signal, and finally the relative intensity noise is suppressed.

[0072] Compared with the related art, the device and method for improving the performance of a high-precision fiber optic gyroscope system provided by the present invention have the following beneficial effects:

[0073] The optical multiplication system can double the detection sensitivity of the fiber optic gyroscope under the same volume conditions, and the temperature performance, optical stress effect and winding difficulty of the fiber ring are not changed;

[0074] The influence of relative intensity noise on the performance of high-precision fiber optic gyroscope can be effectively reduced by superimposing the autocorrelation intensity of interference light and idle reference light, and the performance of high-precision fiber optic gyroscope can be improved only by optical path design, which has higher reliability.

[0075] Combining the optical multiplication system with the relative intensity noise suppression system can greatly improve the comprehensive performance of the high-precision fiber optic gyroscope, with low cost, simple assembly and easy application in mass production.

[0076] Second embodiment

[0077] Please refer to Figure 5 , Figure 6 , Figure 7 and Figure 8 Based on the device and method for improving the performance of a high-precision fiber optic gyroscope system provided in the first embodiment of the present application, the second embodiment of the present application proposes another device and method for improving the performance of a high-precision fiber optic gyroscope system. The second embodiment is only a preferred method of the first embodiment, and the implementation of the second embodiment will not affect the independent implementation of the first embodiment.

[0078] Specifically, the second embodiment of the present application provides a device and method for improving the performance of a high-precision fiber optic gyroscope system. The difference is that the polarization beam splitter 5 includes a polarization beam splitter body 51, and both ends of the side of the polarization beam splitter 51 are provided with connecting frames 54, and the tops of both sides of the inner sides of the two connecting frames 54 are provided with slide grooves 55, and the tops of the inner sides of the slide grooves 55 are provided with positioning grooves 56, and the top of the polarization beam splitter body 51 is provided with a top cover. 53, a pressure plate 52 is provided on the top of the top cover 53, and clamping plates 58 are fixedly installed at both ends of the pressure plate 52, and the clamping plates 58 are slidably connected to the inner side of the slide groove 55, a first groove 59 is opened on the top of the pressure plate 52, and a second groove 50 is opened on the bottom of the pressure plate 52, and the internal thread of the pressure plate 52 is connected to the first threaded rod 511, and a rotating plate 513 is fixedly installed on the top of the first threaded rod 511, and a contact plate 512 is rotatably connected to the bottom of the first threaded rod 511.

[0079] A sealing gasket 531 is fixedly mounted on the bottom of the top cover 53 , and the bottom of the sealing gasket 531 abuts against the top of the polarization beam splitter body 51 .

[0080] Sliding sleeves 57 are fixedly mounted on both ends of the top cover 53 , and the sliding sleeves 57 are slidably connected to the outer side surface of the connecting frame 54 .

[0081] The sliding sleeve 57 slides on the outer side of the connecting frame 54 , thereby limiting the top cover 53 and preventing the top cover 53 from sliding on the top of the polarization beam splitter body 51 .

[0082] The bottom of the abutting plate 512 abuts against the top of the top cover 53 .

[0083] When installing the top cover 53, place the top cover 53 on the top of the polarization beam splitter body 51 so that the sealing gasket 531 abuts against the top of the polarization beam splitter body 51, and then push the pressure plate 52 from one end of the top cover 53 to the top of the top cover 53, so that the clamping plate 58 slides on the inner side of the slide groove 55, and the clamping plate 58 is at the bottom of the positioning groove 56, and then the user rotates the rotating plate 513 so that the rotating plate 513 drives the first threaded rod 511 to be threadedly connected inside the pressure plate 52, so that the bottom of the abutting plate 512 abuts against the top of the top cover 53, thereby driving the pressure plate 52 to move upward, so that the clamping plate 58 is clamped into the inner side of the positioning groove 56, and then the first threaded rod 511 is rotated again, so as to push the top cover 53 to move downward, so that the top cover 53 is pressed tightly against the top of the polarization beam splitter body 51 to play a sealing role.

[0084] The working principle of a device and method for improving the performance of a high-precision fiber optic gyroscope system provided by the present invention is as follows:

[0085] When in use, when it is necessary to maintain the interior of the polarization beam splitter body 51, the user can rotate the rotating plate 513 so that the rotating plate 513 drives the first threaded rod 511 to be threadedly connected inside the pressure plate 52, thereby moving the abutment plate 512 away from the top cover 53, and then moving the snap-in plate 58 from the inner side of the positioning groove 56 to the inner side of the slide groove 55, and then sliding the pressure plate 52 on the top of the top cover 53, so that the snap-in plate 58 slides out from the inner side of the slide groove 55, and then the user can remove the pressure plate 52, and then the top cover 53 can be removed from the top of the polarization beam splitter body 51, which is convenient for the user to maintain the interior of the polarization beam splitter body 51.

[0086] Compared with the related art, the device and method for improving the performance of a high-precision fiber optic gyroscope system provided by the present invention have the following beneficial effects:

[0087] Through the cooperation of structures such as the polarization beam splitter body 51, the top cover 53, the pressure plate 52, the connecting frame 54, the slide groove 55, the positioning groove 56, the first threaded rod 511, the abutment plate 512 and the rotating plate 513, when the polarization beam splitter body 51 needs to be maintained, it is only necessary to rotate the rotating plate 513 to drive the first threaded rod 511 to be threadedly connected inside the pressure plate 52, so that the abutment plate 512 is away from the top cover 53, and then the pressure plate 52 is moved to disassemble the top cover 53. The operation is convenient and quick, which increases work efficiency.

[0088] Third embodiment

[0089] Please refer to Fig. 9 and Fig.10 Based on the device and method for improving the performance of a high-precision fiber optic gyroscope system provided in the first embodiment of the present application, the third embodiment of the present application proposes another device and method for improving the performance of a high-precision fiber optic gyroscope system. The third embodiment is only a preferred method of the first embodiment, and the implementation of the third embodiment will not affect the independent implementation of the first embodiment.

[0090] Specifically, the difference between the device and method for improving the performance of a high-precision fiber optic gyroscope system provided in the third embodiment of the present application is that, in a device and method for improving the performance of a high-precision fiber optic gyroscope system, the polarization-maintaining circulator 2 includes a polarization-maintaining circulator 2 body, and connecting tubes 22 are fixedly installed at both ends of the polarization-maintaining circulator body 2, and a rubber sleeve 27 is provided on the outer side of the connecting tube 22.

[0091] The top and bottom of the inner side of the connecting tube 22 are provided with placement grooves 23, and the inner side of the placement groove 23 is provided with a clamping plate 26. One side of the clamping plate 26 is rotatably connected to a second threaded rod 24, and the second threaded rod 24 is threadedly connected to the inside of the connecting tube 22.

[0092] A pushing plate 25 is fixedly mounted on one end of the second threaded rod 24 .

[0093] The working principle of a device and method for improving the performance of a high-precision fiber optic gyroscope system provided by the present invention is as follows:

[0094] When in use, the optical fiber is passed through the inner side of the connecting tube 22 and then connected to the polarization-maintaining circulator body 21. The pushing plate 25 is then rotated to drive the second threaded rod 24 to be threadedly connected inside the connecting tube 22, so that the two clamping plates 26 move out from the inner side of the placement groove 23 to clamp the rubber sleeve 27, so that the rubber sleeve 27 clamps and limits the optical fiber.

[0095] Compared with the related art, the device and method for improving the performance of a high-precision fiber optic gyroscope system provided by the present invention have the following beneficial effects:

[0096] By means of the cooperation of the connecting tube 22, the placement groove 23, the second threaded rod 24, the pushing plate 25, the clamping plate 26 and the rubber sleeve 27, when in use, the two clamping plates 26 can clamp the rubber sleeve 27, so that the rubber sleeve 27 clamps the optical fiber, thereby preventing the optical fiber from moving on the inner side of the rubber sleeve 27 and rubbing against the rubber sleeve 27, thereby protecting the optical fiber.

[0097] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A device for improving the performance of a high-precision fiber optic gyroscope system, characterized in that: include: light source; A polarization-maintaining circulator, wherein the polarization-maintaining circulator is connected to the light source via an optical fiber; A first coupler, wherein the first coupler is connected to the polarization-maintaining circulator via an optical fiber; A 45° fusion point, wherein the 45° fusion point is connected to the first coupler via an optical fiber; A polarization beam splitter, wherein the polarization beam splitter is connected to the 45° fusion point via an optical fiber, the polarization beam splitter is also connected to an electro-optic phase modulator, an optical fiber ring and a polarization-maintaining Faraday rotator via an optical fiber, and the electro-optic phase modulator and the optical fiber ring are also connected via an optical fiber; A second coupler, wherein the second coupler is connected to the polarization-maintaining circulator via an optical fiber, the second coupler is also connected to a detector and a 90° fusion point via an optical fiber, and the 90° fusion point is connected to the first coupler via an optical fiber.

2. The device and method for improving the performance of a high-precision fiber optic gyroscope system according to claim 1, characterized in that: The first coupler and the second coupler are both 1×2 couplers, and the splitting ratio between the first coupler and the second coupler is 90:

10.

3. The method for improving the performance of a high-precision fiber optic gyroscope system according to claim 1-2, characterized in that: The following steps are involved: S1, the light source emits irregular polarized light which is modulated into linear polarized light by a polarization-maintaining circulator; S2, the polarization-maintaining circulator modulates the orthogonal linear polarization light carrying interference information returned from the optical fiber ring into linear polarization light parallel to the main axis of the polarization-maintaining circulator; S3, the main axis of the first coupler pigtail is fused at 45° to the polarization beam splitter pigtail, and the linear polarized light passes through the 45° fusion point 4 and is equally divided into linear polarized light parallel to and perpendicular to the main axis of the polarization beam splitter, and the idle reference light transmitted by the first coupler is transmitted through the slow axis of the second coupler pigtail; S4, the polarization-maintaining Faraday rotator mirror cooperates with the polarization beam splitter to make mutually orthogonal linear polarized lights pass through the optical fiber ring twice respectively; S5, an electro-optical phase modulator modulates the optical signal entering the optical fiber ring; S6, 45° fusion point, polarization beam splitter, electro-optic phase modulator, fiber ring and polarization-maintaining Faraday rotator constitute the optical path multiplication system; S7, the polarization-maintaining circulator, the first coupler and the second coupler constitute a relative intensity noise suppression system; S8. The detector receives the optical signal obtained by coupling the autocorrelation intensity of the fiber optic gyroscope interference light and the idle reference light through the second coupler. The difference between the interference light and the reference light during the transmission process will be reflected in the change of the noise amplitude in the digital closed-loop system. The electro-optical phase modulator is controlled to perform feedback compensation on the optical signal, and finally the relative intensity noise is suppressed.

4. The device for improving the performance of a high-precision fiber optic gyroscope system according to claim 1, characterized in that: The polarization beam splitter includes a polarization beam splitter body, connecting frames are provided at both ends of the side of the polarization beam splitter, slide grooves are provided on the tops of both sides of the inner side surfaces of the two connecting frames, and positioning grooves are provided on the tops of the inner side surfaces of the slide grooves. A top cover is provided on the top of the polarization beam splitter body, and a pressure plate is provided on the top of the top cover. Both ends of the two sides of the pressure plate are fixedly installed with clamping plates, and the clamping plates are slidably connected to the inner side surfaces of the slide grooves. A first groove is provided on the top of the pressure plate, and a second groove is provided on the bottom of the pressure plate. The internal thread of the pressure plate is connected with a first threaded rod, a rotating plate is fixedly installed on the top of the first threaded rod, and a contact plate is rotatably connected to the bottom of the first threaded rod.

5. The device for improving the performance of a high-precision fiber optic gyroscope system according to claim 4, characterized in that: A sealing gasket is fixedly mounted on the bottom of the top cover, and the bottom of the sealing gasket abuts against the top of the polarization beam splitter body.

6. The device for improving the performance of a high-precision fiber optic gyroscope system according to claim 4, characterized in that: Sliding sleeves are fixedly installed at both ends of both sides of the top cover, and the sliding sleeves are slidably connected to the outer side surface of the connecting frame.

7. The device for improving the performance of a high-precision fiber optic gyroscope system according to claim 4, characterized in that: The bottom of the abutting plate abuts against the top of the top cover.

8. The device for improving the performance of a high-precision fiber optic gyroscope system according to claim 1, characterized in that: The polarization-maintaining circulator comprises a polarization-maintaining circulator body. Connecting pipes are fixedly installed at both ends of the polarization-maintaining circulator body. Rubber sleeves are sleeved on the outer side of the connecting pipes.

9. The device for improving the performance of a high-precision fiber optic gyroscope system according to claim 8, characterized in that: The top and bottom of the inner side of the connecting tube are provided with placement grooves, the inner side of the placement groove is provided with a clamping plate, one side of the clamping plate is rotatably connected to a second threaded rod, and the second threaded rod is threadedly connected to the inside of the connecting tube.

10. The device for improving the performance of a high-precision fiber optic gyroscope system according to claim 9, characterized in that: A pushing plate is fixedly mounted on one end of the second threaded rod.

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