Optical fiber winding method for three-axis optical fiber gyroscope and three-axis optical fiber gyroscope

Abstract

The present invention provides a fiber wrapping method for a three-axis fiber optic gyroscope and a three-axis fiber optic gyroscope. The present invention performs a pulling test on the fiber optic ring of the fiber optic gyroscope, and selects the frequency difference that needs to be maintained in each optical path according to the actual test result, thereby improving the accuracy of the staggered frequency design; on the basis of the original three-axis integrated fiber optic gyroscope, only the number of cushion fiber layers corresponding to the fiber optic rings of two axes is changed during the fiber wrapping process to achieve the staggered frequency design of the optical path of the three-axis fiber optic gyroscope, effectively solving the problem of co-frequency interference of the three-axis fiber optic rings, with minor structural changes to the original fiber optic gyroscope, which is conducive to the implementation of improving the accuracy of the fiber optic gyroscope; according to the size range of the fiber optic ring and the structural parts, the total length of the optical fiber of the three fiber optic rings of the three-axis fiber optic gyroscope is accurately controlled to achieve the staggered frequency design of the optical path of the three-axis fiber optic gyroscope, solve the problem of co-frequency interference of the gyroscope, improve the accuracy of the gyroscope, and ensure the reliability of the output result of the fiber optic gyroscope.

Description

Technical Field

[0001] The present invention relates to the technical field of fiber optic gyroscopes, and in particular to a fiber optic winding method for a three-axis fiber optic gyroscope and the three-axis fiber optic gyroscope. Background Art

[0002] Fiber optic gyroscope is an instrument that can accurately determine the position of a moving object. It is essentially an angular rate sensor based on the Sagnac effect. It is an inertial navigation instrument widely used in modern aviation, navigation, aerospace and defense industries. Fiber optic gyroscope is a sensitive element based on an optical fiber coil. The light emitted by the laser diode propagates along the optical fiber in two directions. The change in the light propagation path determines the angular displacement of the sensitive element. Due to its low cost, high reliability, and strong resistance to shock and vibration, its application prospects have been highly valued and it has become one of the mainstream sensors.

[0003] At present, when the frequencies of each axis in a three-axis fiber optic gyroscope are relatively close, there is a common problem of co-frequency interference. The co-frequency interference problem will cause the gyroscope zero bias to oscillate and the gyroscope accuracy to deteriorate. This problem is particularly obvious in a three-axis integrated fiber optic gyroscope with a compact layout and a very high degree of integration. This defect affects the reliability of the information collected by the fiber optic gyroscope. Currently, there is a lack of technical means to deal with and solve the co-frequency interference in three-axis fiber optic gyroscopes. Summary of the invention

[0004] The present invention provides a fiber winding system method for a three-axis fiber optic gyroscope and a three-axis fiber optic gyroscope, which are used to solve the problem of gyroscope zero bias test curve oscillation caused by co-frequency interference of multi-axis fiber rings of the three-axis fiber optic gyroscope in the prior art, thereby ensuring the accuracy of the fiber optic gyroscope.

[0005] The present invention provides a method for winding an optical fiber of a three-axis optical fiber gyroscope, comprising:

[0006] S1 performs a zero bias test on the optical fiber ring of each axis of the three-axis fiber optic gyroscope at multiple different pulling bias frequencies to determine whether the three-axis fiber optic gyroscope has an oscillation phenomenon;

[0007] S2: if the three-axis fiber optic gyroscope does not have an oscillation phenomenon, obtaining a first frequency difference of the Y-axis fiber optic ring relative to the X-axis fiber optic ring, and further obtaining a second frequency difference of the Y-axis fiber optic ring relative to the Z-axis fiber optic ring;

[0008] S3, based on the first frequency difference and the second frequency difference, respectively calculating the total length of optical fiber that needs to be wound around the Y-axis optical fiber ring and the Z-axis optical fiber ring;

[0009] S4 obtains the number of winding layers of the Y-axis optical fiber ring and the Z-axis optical fiber ring, and determines the number of fiber padding layers required for the Y-axis optical fiber ring and the Z-axis optical fiber ring respectively based on the total length of optical fiber that needs to be wound around the Y-axis optical fiber ring and the Z-axis optical fiber ring;

[0010] S5 performs fiber padding on the Y-axis optical fiber ring and the Z-axis optical fiber ring respectively according to the number of fiber padding layers required for the Y-axis optical fiber ring and the Z-axis optical fiber ring determined in step S4.

[0011] Wherein, step S1 specifically includes:

[0012] S101 takes the characteristic frequency of the X-axis optical fiber ring as a reference, obtains the frequency difference between the Y-axis optical fiber ring and the X-axis optical fiber ring, and the frequency difference between the Y-axis optical fiber ring and the Z-axis optical fiber ring

[0013] S102 performs a zero bias test on the optical fiber ring assembly of each axis in the three-axis optical fiber gyroscope to determine whether the three-axis optical fiber gyroscope has an oscillation phenomenon. If an oscillation phenomenon exists, the frequency difference is adjusted and the zero bias test is performed again until the three-axis optical fiber gyroscope does not have an oscillation phenomenon.

[0014] Further, in step S3, the length of the Y-axis optical fiber ring to be wound is calculated. y , The Z-axis fiber optic ring needs to be wound with a length of l z The length of the application formula:

[0015]

[0016]

[0017] Where f1 is the characteristic frequency of the X-axis fiber ring, c is the speed of light, n is the refractive index of the fiber on the fiber ring, l bd is the sum of the lengths of the pigtails at the output end of the Y waveguide, Δf1 is the first frequency difference, Δf2 is the second frequency difference; Δf1≥0.5kHz, Δf2≥0.5kHz.

[0018] Specifically, in step S4, the number of layers of fiber pads required for the Y-axis optical fiber ring and the Z-axis optical fiber ring is determined by applying the formula:

[0019]

[0020]

[0021] Wherein, R1 is the diameter of the looped optical fiber, and the error is ΔR1≤1μm;

[0022] R2 is the ring width of the optical fiber ring, (n3+0.5)·R1≤R2≤n3·R1, n3 is the number of turns of the first layer;

[0023] R3 is the inner diameter of the ring frame of the optical fiber ring, and R3 is greater than the minimum bending radius of the optical fiber wound around the ring;

[0024] R4 is the outer diameter of the fiber around the ring, that is, the outer diameter of the fiber coating;

[0025] N1 is the number of winding layers of the Y-axis optical fiber ring, and N2 is the number of winding layers of the Z-axis optical fiber ring;

[0026] Wherein, n1 is the number of fiber padding layers of the Y-axis optical fiber ring, n2 is the number of fiber padding layers of the Z-axis optical fiber ring, and the number of fiber padding layers calculated by n1 and n2 are rounded up and added to one.

[0027] Preferably, the optical fiber of the fiber pad in step S4 is consistent with the optical fiber type, optical fiber diameter, and coating material of the optical fiber wound around the optical fiber ring.

[0028] Preferably, the optical fiber of the fiber pad in step S4 is a single-mode optical fiber, whose cladding diameter is 60 μm, the coating diameter R4 is 100 μm, and the diameter error ΔR4 ≤ 1 μm.

[0029] The present invention also provides a three-axis fiber optic gyroscope, which includes an X-axis fiber optic ring, a Y-axis fiber optic ring and a Z-axis fiber optic ring. The number of fiber padding layers of the Y-axis fiber optic ring and the Z-axis fiber optic ring is obtained according to the winding method described in any of the above items, and the Y-axis fiber optic ring and the Z-axis fiber optic ring are further wound.

[0030] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0031] (1) The present invention can realize the optical path frequency staggering design of the three-axis fiber optic gyroscope by only changing the number of bottom optical fibers (i.e., pad fibers) corresponding to the optical fiber rings of two axes during the optical fiber winding process on the basis of the original three-axis integrated fiber optic gyroscope, thereby solving the problem of three-axis co-frequency interference. The original scheme is slightly modified, which is convenient for implementation;

[0032] (2) When performing frequency offset design, the frequency of each axis of the three-axis fiber optic gyroscope can be pulled off by performing frequency offset test on the equipment first, and the frequency difference that needs to be maintained in each optical path can be selected according to the actual test results, thereby improving the accuracy of the frequency offset design;

[0033] (3) The base fiber used for the fiber ring pad is a single-mode fiber with the same coating material and the same diameter as the ring fiber. It has low cost and the same thermal stress change as the ring fiber, which can protect the inner fiber and mitigate the impact of external thermal effects.

[0034] (4) When setting the fiber optic ring winding parameters, the fiber diameter error of the winding ring, the fiber ring width design error, the fiber ring inner diameter requirements, etc. are controlled, which can effectively control the number of turns of each layer of the fiber optic ring, so that the fiber optic ring has better winding quality and more accurate fiber ring length control, making the frequency error more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 This is one of the flow diagrams of a method for winding an optical fiber of a three-axis optical fiber gyroscope provided by the present invention;

[0037] Figure 2 This is one of the test effect schematic diagrams of the three-axis fiber optic gyroscope provided by the present invention;

[0038] Figure 3 This is the second schematic diagram of the test effect of the three-axis fiber optic gyroscope provided by the present invention. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] The terms "first", "second", "third", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0041] The embodiment of the present invention provides a method for winding an optical fiber of a three-axis optical fiber gyroscope. Figure 1 As shown, the specific steps include:

[0042] S1 performs a zero bias test on the optical fiber ring of each axis of the three-axis fiber optic gyroscope at multiple different pulling bias frequencies to determine whether the three-axis fiber optic gyroscope has an oscillation phenomenon;

[0043] S2: if the three-axis fiber optic gyroscope does not have an oscillation phenomenon, obtaining a first frequency difference of the Y-axis fiber optic ring relative to the X-axis fiber optic ring, and further obtaining a second frequency difference of the Y-axis fiber optic ring relative to the Z-axis fiber optic ring;

[0044] S3, based on the first frequency difference and the second frequency difference, respectively calculating the total length of optical fiber that needs to be wound around the Y-axis optical fiber ring and the Z-axis optical fiber ring;

[0045] S4 obtains the number of winding layers of the Y-axis optical fiber ring and the Z-axis optical fiber ring, and determines the number of fiber padding layers required for the Y-axis optical fiber ring and the Z-axis optical fiber ring respectively based on the total length of optical fiber that needs to be wound around the Y-axis optical fiber ring and the Z-axis optical fiber ring;

[0046] S5 performs fiber padding on the Y-axis optical fiber ring and the Z-axis optical fiber ring respectively according to the number of fiber padding layers required for the Y-axis optical fiber ring and the Z-axis optical fiber ring determined in step S4.

[0047] It should be noted that the X-axis fiber ring, the Y-axis fiber ring, and the Z-axis fiber ring are three groups of fiber rings in the three-axis fiber optic gyroscope, and the relative positional relationship and the relative angles between the three are clear. The X, Y, and Z axes are only names used for description and should not be regarded as a specific order of objects. It can be understood that the "X, Y, and Z axes" can be interchanged in a specific order or sequence where permitted; it should be understood that the objects distinguished by the "X, Y, and Z axes" can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those described or illustrated herein;

[0048] Wherein, step S1 specifically includes:

[0049] S101 takes the characteristic frequency of the X-axis optical fiber ring as a reference, obtaining the frequency difference of the Y-axis optical fiber ring relative to the X-axis optical fiber ring and the frequency difference between the Y-axis optical fiber ring and the Z-axis optical fiber ring;

[0050] S102 performs a zero bias test on the optical fiber ring assembly of each axis in the three-axis optical fiber gyroscope to determine whether the three-axis optical fiber gyroscope has an oscillation phenomenon. If an oscillation phenomenon exists, adjust the frequency difference and re-perform the zero bias test until the three-axis optical fiber gyroscope does not have an oscillation phenomenon.

[0051] Specifically, first determine the reference axis for adjusting the frequency difference of the optical fiber ring, keep the characteristic frequency of the X-axis optical fiber unchanged, adjust the characteristic frequencies of the Y-axis and Z-axis, obtain the initial frequency difference of the Y-axis relative to the X-axis, and obtain the initial frequency difference of the Y-axis relative to the Z-axis;

[0052] The above steps perform a frequency deviation test on a three-axis fiber optic gyroscope with crosstalk, determine whether there is an oscillation phenomenon between optical fibers of different axes, and determine whether the zero bias accuracy of the optical fiber rings of different axes meets the requirements; for a fiber optic gyroscope that does not meet the accuracy requirements, adjust the frequency difference of the Y axis relative to the X axis and the frequency difference of the Y axis relative to the Z axis according to the test results, and perform the frequency deviation test again;

[0053] If the accuracy of the fiber optic gyroscope is still lower than the set threshold value after the second test, the frequency difference between the Y axis and the X axis and the frequency difference between the Y axis and the Z axis are further adjusted, and the test is repeated;

[0054] If the accuracy of the fiber optic gyroscope obtained by the test again meets the set accuracy threshold requirement, the frequency difference obtained at this time is used as the first frequency difference and the second frequency difference, and is used for subsequent calculations; the range of the frequency that needs to be staggered by the fiber optic ring is selected according to the actual test situation, which is conducive to improving the accuracy of the frequency difference;

[0055] It should be noted that this is only an example of an embodiment of the present invention, and the X, Y, and Z axes are relative descriptive terms. Whether the characteristic frequency of the X-axis fiber ring is used as a reference or the characteristic frequency of the Y-axis or Z-axis fiber ring is used as a reference, it does not affect the implementation of the method of the present invention.

[0056] Among them, step S3, calculates the required winding length l of the Y-axis optical fiber ring y , The Z-axis fiber optic ring needs to be wound with a length of l z The length of the application formula:

[0057]

[0058]

[0059] Where f1 is the characteristic frequency of the X-axis fiber ring, c is the speed of light, n is the refractive index of the fiber on the fiber ring, l bd is the sum of the lengths of the pigtails at the output end of the Y waveguide, Δf1 is the first frequency difference, and Δf2 is the second frequency difference; Δf1≥0.5kHz, Δf2≥0.5kHz;

[0060] Further, in step S4, the Y-axis optical fiber ring obtained according to the above method needs to be wound with a ring length l y , The Z-axis fiber optic ring needs to be wound with a length of l z , calculate and determine the number of fiber padding layers required for the Y-axis fiber ring and the Z-axis fiber ring, using the formula:

[0061]

[0062]

[0063] Wherein, R1 is the diameter of the looped optical fiber, and the error is ΔR1≤1μm;

[0064] R2 is the width of the fiber ring, that is, the axial height of the fiber ring, (n3+0.5)·R1≤R2≤n3·R1, n3 is the number of turns of the first layer;

[0065] R3 is the inner diameter of the fiber ring frame, and R3 is greater than the minimum bending radius of the fiber around the ring;

[0066] R4 is the outer diameter of the fiber around the ring, that is, the outer diameter of the fiber coating;

[0067] N1 is the number of winding layers of the Y-axis optical fiber ring, and N2 is the number of winding layers of the Z-axis optical fiber ring;

[0068] Wherein, n1 is the number of fiber cushion layers of the Y-axis optical fiber ring, n2 is the number of fiber cushion layers of the Z-axis optical fiber ring, and the number of fiber cushion layers calculated by n1 and n2 is rounded up and added to one;

[0069] By calculating the number of fiber layers, the fiber rings of multiple axes on the three-axis fiber optic gyroscope can be staggered without changing the structure of the fiber optic gyroscope, which is conducive to eliminating the frequency error interference caused by the close characteristic frequencies. It only needs to improve the number of fiber layers of the fiber ring, without changing the original fiber optic gyroscope design, which can effectively reduce the cost of research and development.

[0070] Preferably, the fiber padding in step S4 is consistent with the fiber type, fiber diameter, and coating material of the fiber wound in the fiber ring; that is, when the Y-axis and Z-axis fiber rings are wound, the number of winding layers of the original Y-axis fiber ring and the number of winding layers of the Z-axis fiber ring remain unchanged, and fiber padding is performed between the winding fiber and the ring skeleton of the fiber ring. The number of fiber padding layers is calculated according to the above steps, and an optical fiber of the same type, diameter, and coating material as the optical fiber wound on the fiber ring is selected as the base optical fiber, and fiber padding is performed on the outer surface of the ring skeleton of the fiber ring and the inner lining surface of the fiber ring;

[0071] By using the same coating material and the same diameter single-mode optical fiber as the ring optical fiber for the bottom optical fiber, the manufacturing cost of the fiber optic gyroscope is further reduced, and the thermal stress changes of the bottom optical fiber and the ring optical fiber are consistent, thereby protecting the inner optical fiber and mitigating the influence of external thermal effects;

[0072] Preferably, the fiber padding in step S4 is a single-mode fiber, whose cladding diameter is 60 μm, the coating diameter R4 is 100 μm, and the diameter error ΔR4 ≤ 1 μm; by controlling the fiber diameter error of the winding ring, the fiber ring width design error, the fiber ring inner diameter requirement, etc., the number of winding turns of each layer of the fiber ring can be effectively controlled, so that the fiber ring has better winding quality and more accurate fiber ring length control, which makes the frequency error more accurate, which is beneficial to improving the accuracy of the fiber optic gyroscope.

[0073] In one embodiment, the present invention further provides a three-axis fiber optic gyroscope, which includes an X-axis fiber optic ring, a Y-axis fiber optic ring, and a Z-axis fiber optic ring. The structural parameters of the fiber optic ring are obtained based on the characteristic frequency of the X-axis fiber optic ring, and the Y-axis fiber optic ring and the Z-axis fiber optic ring are wound according to the winding method described in the above steps;

[0074] like Figure 2 As shown, a schematic diagram of the test results of a fiber optic gyroscope with zero bias oscillation is illustrated, and it can be seen that the accuracy of the gyroscope is 0.014° / h; and the three-axis fiber optic gyroscope provided by the embodiment of the present invention, using the method provided by the above embodiment, includes the steps of:

[0075] S1 performs a zero bias test on the optical fiber ring of each axis of the three-axis fiber optic gyroscope at multiple different pulling bias frequencies to determine whether the three-axis fiber optic gyroscope has an oscillation phenomenon;

[0076] S2: if the three-axis fiber optic gyroscope does not have an oscillation phenomenon, obtaining a first frequency difference of the Y-axis fiber optic ring relative to the X-axis fiber optic ring, and further obtaining a second frequency difference of the Y-axis fiber optic ring relative to the Z-axis fiber optic ring;

[0077] S3, based on the first frequency difference and the second frequency difference, respectively calculating the total length of optical fiber that needs to be wound around the Y-axis optical fiber ring and the Z-axis optical fiber ring;

[0078] S4 obtains the number of winding layers of the Y-axis optical fiber ring and the Z-axis optical fiber ring, and determines the number of fiber padding layers required for the Y-axis optical fiber ring and the Z-axis optical fiber ring respectively based on the total length of optical fiber that needs to be wound around the Y-axis optical fiber ring and the Z-axis optical fiber ring;

[0079] S5, padding the Y-axis optical fiber ring and the Z-axis optical fiber ring respectively according to the number of layers of padding required for the Y-axis optical fiber ring and the Z-axis optical fiber ring determined in step S4;

[0080] Preferably, the fiber padding in step S4 is consistent with the fiber type, fiber diameter, and coating material of the fiber wound in the fiber ring; that is, when the Y-axis and Z-axis fiber rings are wound, the number of winding layers of the original Y-axis fiber ring and the number of winding layers of the Z-axis fiber ring remain unchanged, and fiber padding is performed between the winding fiber and the ring skeleton of the fiber ring. The number of fiber padding layers is calculated according to the above steps, and an optical fiber of the same type, diameter, and coating material as the optical fiber wound on the fiber ring is selected as the base optical fiber, and fiber padding is performed on the outer surface of the ring skeleton of the fiber ring and the inner lining surface of the fiber ring;

[0081] By using the same coating material and single-mode fiber of the same diameter as the ring fiber for the bottom fiber, the manufacturing cost of the fiber optic gyroscope is further reduced, and the thermal stress changes of the bottom fiber and the ring fiber are consistent, thereby protecting the inner fiber and mitigating the impact of external thermal effects.

[0082] The three-axis fiber optic gyroscope that has been padded with fiber through the above steps is subjected to a zero bias test, and the test results are as follows: Figure 3 As shown, the obtained accuracy is 0.0045° / h. It can be seen that the three-axis fiber optic gyroscope provided in the embodiment of the present invention after the improvement through the above steps has higher accuracy, and the fiber optic gyroscope is improved through the above steps, and it is only necessary to perform fiber padding operation on the original fiber optic gyroscope, and there is no need to improve the structure of the original fiber optic gyroscope, which greatly saves R&D and manufacturing costs.

[0083] The present application also provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of the above method when executed by a processor. The computer-readable storage medium may include, but is not limited to, any type of disk, including a floppy disk, an optical disk, a DVD, a CD-ROM, a micro drive, and a magneto-optical disk, a ROM, a RAM, an EPROM, an EEPROM, a DRAM, a VRAM, a flash memory device, a magnetic card or an optical card, a nanosystem (including a molecular memory IC), or any type of medium or device suitable for storing instructions and / or data.

[0084] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0085] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0086] In the several embodiments provided in the present application, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are only schematic, such as the division of the units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some service interfaces, and the indirect coupling or communication connection of devices or units can be electrical or other forms.

[0087] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0088] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0089] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a memory, including a number of instructions to enable a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned memory includes: U disk, read-only memory (ROM), random access memory (RAM), mobile hard disk, disk or optical disk and other media that can store program code.

[0090] A person skilled in the art may understand that all or part of the steps in the various methods of the above embodiments may be completed by entering a program to instruct related hardware. The program may be stored in a computer-readable memory, and the memory may include: a flash drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0091] The above is only an exemplary embodiment of the present disclosure, and the scope of the present disclosure cannot be limited thereto. That is, any equivalent changes and modifications made according to the teachings of the present disclosure are still within the scope of the present disclosure. After considering the specification and practicing the disclosure here, those skilled in the art will easily think of the implementation scheme of the present disclosure. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the technical field not recorded in the present disclosure. The description and examples are regarded as exemplary only, and the scope and spirit of the present disclosure are defined by the claims.

[0092] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0093] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for winding an optical fiber of a three-axis optical fiber gyroscope, characterized in that: include: S1 performs a zero bias test on the optical fiber ring of each axis of the three-axis fiber optic gyroscope at multiple different pulling bias frequencies to determine whether the three-axis fiber optic gyroscope has an oscillation phenomenon; S2: if the three-axis fiber optic gyroscope does not have an oscillation phenomenon, obtaining a first frequency difference of the Y-axis fiber optic ring relative to the X-axis fiber optic ring, and further obtaining a second frequency difference of the Y-axis fiber optic ring relative to the Z-axis fiber optic ring; S3, based on the first frequency difference and the second frequency difference, respectively calculating the total length of optical fiber that needs to be wound around the Y-axis optical fiber ring and the Z-axis optical fiber ring; S4 obtains the number of winding layers of the Y-axis optical fiber ring and the Z-axis optical fiber ring, and determines the number of fiber padding layers required for the Y-axis optical fiber ring and the Z-axis optical fiber ring respectively based on the total length of optical fiber that needs to be wound around the Y-axis optical fiber ring and the Z-axis optical fiber ring; S5 performs fiber padding on the Y-axis optical fiber ring and the Z-axis optical fiber ring respectively according to the number of fiber padding layers required for the Y-axis optical fiber ring and the Z-axis optical fiber ring determined in step S4.

2. The optical fiber winding method of a three-axis optical fiber gyroscope according to claim 1, characterized in that: Step S1 specifically includes: S101 takes the characteristic frequency of the X-axis optical fiber ring as a reference, obtains the frequency difference between the Y-axis optical fiber ring and the X-axis optical fiber ring, and the frequency difference between the Y-axis optical fiber ring and the Z-axis optical fiber ring; S102 performs a zero bias test on the optical fiber ring assembly of each axis in the three-axis optical fiber gyroscope to determine whether the three-axis optical fiber gyroscope has an oscillation phenomenon. If an oscillation phenomenon exists, the frequency difference is adjusted and the zero bias test is performed again until the three-axis optical fiber gyroscope does not have an oscillation phenomenon.

3. The optical fiber winding method of a three-axis optical fiber gyroscope according to claim 1, characterized in that: In step S3, the required winding length of the Y-axis optical fiber ring is calculated. y , The Z-axis fiber optic ring needs to be wound with a length of l z The length of the application formula: Where f1 is the characteristic frequency of the X-axis fiber ring, c is the speed of light, n is the refractive index of the fiber on the fiber ring, l bd is the sum of the lengths of the pigtails at the output end of the Y waveguide, Δf1 is the first frequency difference, Δf2 is the second frequency difference; Δf1≥0.5kHz, Δf2≥0.5kHz.

4. The optical fiber winding method of a three-axis optical fiber gyroscope according to claim 1, characterized in that: In step S4, the number of layers of fiber pads required for the Y-axis optical fiber ring and the Z-axis optical fiber ring is determined by applying the formula: Wherein, R1 is the diameter of the looped optical fiber, and the error is ΔR1≤1μm; R2 is the ring width of the optical fiber ring, (n3+0.5)·R1≤R2≤n3·R1, n3 is the number of turns of the first layer; R3 is the inner diameter of the fiber ring frame, and R3 is greater than the minimum bending radius of the fiber around the ring; R4 is the outer diameter of the ring-wound optical fiber; N1 is the number of winding layers of the Y-axis optical fiber ring, and N2 is the number of winding layers of the Z-axis optical fiber ring; Wherein, n1 is the number of fiber padding layers of the Y-axis optical fiber ring, n2 is the number of fiber padding layers of the Z-axis optical fiber ring, and the number of fiber padding layers calculated by n1 and n2 are rounded up and added to one.

5. The optical fiber winding method of a three-axis optical fiber gyroscope according to any one of claims 1 to 4, characterized in that: The optical fiber of the fiber pad in step S4 is consistent with the optical fiber type, optical fiber diameter, and coating material of the optical fiber wound around the optical fiber ring.

6. The optical fiber winding method for a three-axis optical fiber gyroscope according to any one of claims 1 to 4, characterized in that: The optical fiber used for fiber padding in step S4 is a single-mode optical fiber, whose optical fiber cladding diameter is 60 μm, optical fiber coating diameter R4 is 100 μm, and diameter error ΔR4≤1 μm.

7. A three-axis fiber optic gyroscope, characterized in that: The three-axis fiber optic gyroscope includes an X-axis fiber optic ring, a Y-axis fiber optic ring and a Z-axis fiber optic ring, and the Y-axis fiber optic ring and the Z-axis fiber optic ring are wound according to the winding method according to any one of claims 1-6.

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