Preparation method of redundant three-axis fiber-optic gyroscope and fiber-optic gyroscope prepared by adopting method

Abstract

The invention relates to a preparation method of a sensor and the sensor, and provides a preparation method of a redundant three-axis fiber-optic gyroscope and a fiber-optic gyroscope prepared by adopting the preparation method in order to solve the problem that the performance of the existing three-axis fiber-optic gyroscope is easy to reduce or the fiber is easy to break. The method comprises the following steps: 1, preparing an optical fiber ring winding tool, optical fiber winding equipment, a main optical fiber with a preset length and a cushion fiber layer optical fiber; 2, winding a main optical fiber ring and a cushion fiber layer ring to obtain a combination of the two; 3, a combination of the main optical fiber ring and the cushion fiber layer ring is fixed in the optical fiber ring fixing cavity; 4, the optical fiber ring fixing cavity and related optical devices are installed on the inner lining plate; 5, repeatedly executing the steps 3-5 twice, and installing different optical fiber ring fixing cavities and optical devices on the other two corresponding inner lining plates; and 6, installing other optical devices to preset positions, and finally obtaining the redundant three-axis fiber-optic gyroscope. The fiber-optic gyroscope prepared by the method has the advantages of small size and low cost.

Description

Technical Field

[0001] The present invention relates to a method for preparing a sensor and the sensor, and in particular to a method for preparing a redundant three-axis fiber optic gyroscope and a fiber optic gyroscope prepared by the method. Background Art

[0002] A fiber optic gyroscope (also known as an FOG) is a sensor that uses the Sagnac effect to measure angular velocity. With its simple structure, no moving parts, and low cost, the FOG has become the preferred angular velocity sensor for inertial navigation systems. Currently, high precision, small size, and high reliability are the development trends of FOGs. Since the optical devices (such as optical fiber rings) in FOGs are mostly connected by gluing, their reliability is much lower than that of electronic devices. The general way to improve the reliability of gyroscopes is to design optical path redundancy. For example, a solution with more than four axes of gyroscopes can be used to replace the three-axis gyroscope solution, and the gyroscope can be backed up to increase its reliability. However, this solution requires a large number of gyroscopes, which increases the cost and volume. In addition, there is also a solution using dual light sources, because the light source is the main failure device.

[0003] From the actual use of the gyroscope, in addition to the light source, the probability of its optical path connectors, Y waveguides, optical fiber rings, etc. being affected by assembly and environmental influences and experiencing performance degradation, fiber breakage, etc. should not be underestimated. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the existing three-axis fiber optic gyroscope is prone to performance degradation or fiber breakage, and to provide a method for preparing a redundant three-axis fiber optic gyroscope and a fiber optic gyroscope prepared by the method.

[0005] To achieve the above purpose, the technical solution provided by the present invention is:

[0006] A method for preparing a redundant three-axis fiber optic gyroscope is characterized in that it comprises the following steps:

[0007] Step 1: Prepare the fiber wrapping tooling, fiber wrapping equipment, main optical fiber of preset length and fiber cushion layer optical fiber;

[0008] Step 2: Use the fiber ring making tool and fiber ring winding equipment to wind and process the main optical fiber and the cushion fiber layer optical fiber to obtain a combination of a main optical fiber ring made of the main optical fiber and a cushion fiber layer ring made of the cushion fiber layer optical fiber, and the combination satisfies: a. The main optical fiber ring is located outside the cushion fiber layer ring, and b. The main optical fiber ring and the cushion fiber layer ring have the same fiber output direction and position;

[0009] Step 3, prepare a circular fiber ring fixing cavity, the inner ring side wall of the fiber ring fixing cavity is provided with a fiber outlet; stick and fix the combination of the main fiber ring and the cushion fiber layer ring in the fiber ring fixing cavity;

[0010] Step 4: Lead out the two pigtails of the main optical fiber ring and the two pigtails of the cushion fiber layer ring from the fiber outlet, and coil them in different clockwise directions in the middle of the optical fiber ring fixing cavity, and the two pigtails of the main optical fiber ring and the two pigtails of the cushion fiber layer ring are at the same height;

[0011] Step 5: prepare a first integrated optical modulator, a first 1×2 single-mode fiber coupler, a first 1×3 single-mode fiber coupler, a first photodetector and an erbium-doped fiber light source, and connect them to the two pigtails of the main fiber ring according to a preset connection method;

[0012] Step 6: prepare a second integrated optical modulator, a second 1×2 single-mode fiber coupler, a second 1×3 single-mode fiber coupler, a second photodetector and an SLD light source, and connect them to the two pigtails of the mat fiber layer ring according to a preset connection method;

[0013] Step 7, define the optical fiber ring fixed cavity, the first 1×2 single-mode optical fiber coupler, the first integrated optical modulator, the second 1×2 single-mode optical fiber coupler and the second integrated optical modulator as a device assembly, and install the device assembly on the first circular lining plate of the optical fiber gyroscope;

[0014] Step 8, repeating steps 3 to 7 twice, the difference being that: installing the other two sets of device assemblies obtained on the second circular inner lining plate and the third circular inner lining plate of the fiber optic gyroscope respectively;

[0015] Step 9: Install an erbium-doped fiber light source, an SLD light source, a first 1×3 single-mode fiber coupler, a second 1×3 single-mode fiber coupler, three first photodetectors, and three second photodetectors at a preset position on the platform of the fiber optic gyroscope to finally obtain a redundant three-axis fiber optic gyroscope.

[0016] Furthermore, the optical fiber surrounding tooling described in step 1 includes a circular first baffle and a second baffle, and a skeleton arranged between the first baffle and the second baffle, the radial cross-section of the skeleton is a circular ring, and its two ends are respectively connected to the first baffle and the second baffle; an arc-shaped first fiber guide groove and a second fiber guide groove are arranged between the outer edge of the inner wall of the second baffle and the outer edge of the skeleton, and the first fiber guide groove and the second fiber guide groove are used to guide out two pigtails of the pad fiber layer ring.

[0017] Furthermore, the optical fiber ring winding device described in step 2 is a ring winding machine, and the use of the optical fiber ring winding tooling and the optical fiber ring winding device to wind and process the main optical fiber and the fiber cushion layer optical fiber is specifically as follows:

[0018] Fix the optical fiber ring winding tooling on the ring winding machine with screws, first wind the cushion fiber layer ring along the outer wall of the skeleton, after the winding is completed, lead out the two pigtails of the cushion fiber layer ring from the first fiber guide groove 4 and the second fiber guide groove to the outer edge of the second baffle respectively and fix them with tape, the size of the first fiber guide groove and the second fiber guide groove are adapted to the optical fiber of the cushion fiber layer ring, so that the inner side of the second baffle is a plane after the pigtail is placed; then adopt the same method as winding the cushion fiber layer ring to wind the main optical fiber ring on the outside of the cushion fiber layer ring, and make the fiber output direction and position of the main optical fiber ring and the cushion fiber layer ring the same; finally, cure and remove the skeleton of the main optical fiber ring and the cushion fiber layer ring.

[0019] Furthermore, step 5 is specifically as follows:

[0020] Prepare a first integrated optical modulator, a first 1×2 single-mode fiber coupler, a first 1×3 single-mode fiber coupler, a first photodetector and an erbium-doped fiber light source; wherein the first integrated optical modulator has two output pigtails and one input pigtail, and the first 1×2 single-mode fiber coupler has one common-end pigtail and two other pigtails; respectively fuse the two pigtails of the main fiber ring with the two output pigtails of the first integrated optical modulator, then fuse the input pigtail of the first integrated optical modulator with the common-end pigtail of the first 1×2 single-mode fiber coupler, and finally respectively connect the two other pigtails of the first 1×2 single-mode fiber coupler with the output end of the first 1×3 single-mode fiber coupler and the input end of the first photodetector, and connect the input end of the first 1×3 single-mode fiber coupler with the output end of the erbium-doped fiber light source;

[0021] Step 6 is as follows:

[0022] Prepare a second integrated optical modulator, a second 1×2 single-mode fiber coupler, a second 1×3 single-mode fiber coupler, a second photodetector and an SLD light source; wherein the second integrated optical modulator has two output pigtails and one input pigtail, and the second 1×2 single-mode fiber coupler has one common-end pigtail and two other pigtails; respectively fuse the two pigtails of the cushion fiber ring with the two output pigtails of the second integrated optical modulator, and then fuse the input pigtail of the second integrated optical modulator with the common-end pigtail of the second 1×2 single-mode fiber coupler, and finally respectively connect the two other pigtails of the second 1×2 single-mode fiber coupler to the output end of the second 1×3 single-mode fiber coupler and the input end of the second photodetector, and connect the input end of the second 1×3 single-mode fiber coupler to the output end of the SLD light source.

[0023] Furthermore, in step 1, the operating wavelength of the main optical fiber is 1550 nm, and the operating wavelength of the cushion layer optical fiber is 1310 nm.

[0024] At the same time, the present invention also provides a redundant three-axis fiber optic gyroscope, which is special in that:

[0025] It is prepared according to the above-mentioned method for preparing a redundant three-axis fiber optic gyroscope.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention provides a method for preparing a redundant three-axis fiber optic gyroscope, which does not add an additional fiber ring module, does not change the size of the original high-precision fiber ring module, and only adds one optical path as a backup optical path, and sets it together with the optical device of the main optical path in the fiber ring fixed cavity to achieve redundancy of the fiber ring module, so that the performance of the fiber optic gyroscope is more stable, the risk of fiber breakage is reduced, and the fiber gyroscope has the advantage of small size;

[0028] 2. The present invention provides a method for preparing a redundant three-axis fiber optic gyroscope, which can flexibly change the assembly method according to the actual gyroscope platform structure;

[0029] 3. The present invention provides a method for preparing a redundant three-axis fiber optic gyroscope, wherein the working wavelength of the main optical fiber is 1550nm, and the working wavelength of the fiber cushion layer is 1310nm, which has the advantage of low cost;

[0030] 4. The redundant three-axis fiber optic gyroscope provided by the present invention has a fiber layer ring which can be used not only as a protective layer but also as a fiber optic ring for a backup optical path. The manufacturing and assembly of the redundant three-axis fiber optic gyroscope are simple, and the space inside the gyroscope can be greatly saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of the principle of a redundant three-axis fiber optic gyroscope embodiment of the present invention, wherein “→” indicates the propagation direction of light;

[0032] Figure 2 It is a structural schematic diagram of an optical fiber wrapping tooling in an embodiment of a method for preparing a redundant three-axis optical fiber gyroscope of the present invention;

[0033] Figure 3 A top view of a single optical fiber ring fixing cavity in an embodiment of a redundant three-axis optical fiber gyroscope of the present invention;

[0034] Description of reference numerals:

[0035] 1-first baffle, 2-skeleton, 3-second baffle, 4-first fiber guide groove, 5-second fiber guide groove, 6-erbium-doped fiber light source, 7-first 1×3 single-mode fiber coupler, 8-first 1×2 single-mode fiber coupler, 9-first integrated optical modulator, 10-main fiber ring, 11-first photodetector, 12-SLD light source, 13-second 1×3 single-mode fiber coupler, 14-second 1×2 single-mode fiber coupler, 15-second integrated optical modulator, 16-pad fiber layer ring, 17-second photodetector, 18-fiber ring fixing cavity, 19-fiber outlet. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0037] A method for preparing a redundant three-axis fiber optic gyroscope, see Figure 1 to Figure 3 , including the following steps:

[0038] Step 1, prepare a fiber optic wrapping tool, a fiber optic ring winding device, a main optical fiber and a cushion fiber layer optical fiber of a preset length, wherein the working wavelength of the main optical fiber is 1550nm, and the working wavelength of the cushion fiber layer optical fiber is 1310nm; the fiber optic wrapping tool comprises a circular first baffle 1 and a second baffle 3, and a skeleton 2 arranged between the first baffle 1 and the second baffle 3, wherein the skeleton 2 is a circular ring, and its two ends are respectively connected to the first baffle 1 and the second baffle 3; an arc-shaped first fiber guide groove 4 and a second fiber guide groove 5 are arranged between the outer edge of the inner side wall of the second baffle 3 and the outer edge of the skeleton 2, and the first fiber guide groove 4 and the second fiber guide groove 5 are used to guide out two pigtails of the cushion fiber layer ring 16;

[0039] The 1310nm optical path here is a backup optical path, and 1310nm is used because it can save costs.

[0040] Step 2, fix the fiber optic ring winding tooling on the ring winding machine by screws, first wind the cushion fiber layer ring 16 along the outer wall of the skeleton 2, and after winding, lead the two pigtails of the cushion fiber layer ring 16 out of the outer edge of the second baffle 3 from the first fiber guide groove 4 and the second fiber guide groove 5 respectively and fix them with tape, the size of the first fiber guide groove 4 and the second fiber guide groove 5 are adapted to the optical fiber of the cushion fiber layer ring 16, so that the inner side of the second baffle 3 is a plane after the pigtails are placed; then, the main optical fiber ring 10 is wound on the outside of the cushion fiber layer ring 16 by the same method as that of winding the cushion fiber layer ring 16, and the fiber output direction and position of the main optical fiber ring 10 and the cushion fiber layer ring 16 are the same; finally, the main optical fiber ring 10 and the cushion fiber layer ring 16 are cured and de-skeletonized to obtain a combination of the main optical fiber ring 10 made of the main optical fiber and the cushion fiber layer ring 16 made of the cushion fiber layer optical fiber;

[0041] Step 3, prepare a circular fiber ring fixing cavity 18, the inner ring side wall of the fiber ring fixing cavity 18 is provided with a fiber outlet 19; paste and fix the combination of the main fiber ring 10 and the cushion fiber layer ring 16 in the fiber ring fixing cavity 18;

[0042] Step 4: Lead the two pigtails of the main optical fiber ring 10 and the two pigtails of the cushion fiber ring 16 from the fiber outlet 19, and coil them in the middle of the optical fiber ring fixing cavity 18 in a clockwise and counterclockwise direction respectively, and the two pigtails of the main optical fiber ring 10 and the two pigtails of the cushion fiber ring 16 are located at the same height;

[0043] Step 5, prepare a first integrated optical modulator 9, a first 1×2 single-mode fiber coupler 8, a first 1×3 single-mode fiber coupler 7, a first photodetector 11 and an erbium-doped fiber light source 6; wherein the first integrated optical modulator 9 has two output pigtails and one input pigtail, and the first 1×2 single-mode fiber coupler 8 has one common-end pigtail and two other pigtails; respectively fuse the two pigtails of the main fiber ring 10 with the two output pigtails of the first integrated optical modulator 9, then fuse the input pigtail of the first integrated optical modulator 9 with the common-end pigtail of the first 1×2 single-mode fiber coupler 8, and finally respectively connect the two other pigtails of the first 1×2 single-mode fiber coupler 8 with the output end of the first 1×3 single-mode fiber coupler 7 and the input end of the first photodetector 11, and connect the input end of the first 1×3 single-mode fiber coupler 7 with the output end of the erbium-doped fiber light source 6;

[0044] Step 6, prepare a second integrated optical modulator 15, a second 1×2 single-mode fiber coupler 14, a second 1×3 single-mode fiber coupler 13, a second photodetector 17 and an SLD light source 12; wherein the second integrated optical modulator 15 has two output pigtails and one input pigtail, and the second 1×2 single-mode fiber coupler 14 has one common-end pigtail and two other pigtails; respectively fuse the two pigtails of the cushion fiber ring 16 with the two output pigtails of the second integrated optical modulator 15, and then fuse the input pigtail of the second integrated optical modulator 15 with the common-end pigtail of the second 1×2 single-mode fiber coupler 14, and finally respectively connect the two other pigtails of the second 1×2 single-mode fiber coupler 14 with the output end of the second 1×3 single-mode fiber coupler 13 and the input end of the second photodetector 17, and connect the input end of the second 1×3 single-mode fiber coupler 13 with the output end of the SLD light source 12;

[0045] Step 7, define the optical fiber ring fixing cavity 18, the first 1×2 single-mode optical fiber coupler 8, the first integrated optical modulator 9, the second 1×2 single-mode optical fiber coupler 14 and the second integrated optical modulator 15 as a device assembly, and install the device assembly on the first circular inner lining plate of the optical fiber gyroscope;

[0046] Step 8, repeating steps 3 to 7 twice, the difference being that: installing the other two sets of device assemblies obtained on the second circular inner lining plate and the third circular inner lining plate of the fiber optic gyroscope respectively;

[0047] Step 9: Install an erbium-doped fiber light source 6, an SLD light source 12, a first 1×3 single-mode fiber coupler 7, a second 1×3 single-mode fiber coupler 13, three first photodetectors 11, three second photodetectors 17 and a connecting circuit at a preset position on the platform of the fiber optic gyroscope to finally obtain a redundant three-axis fiber optic gyroscope.

[0048] This embodiment mainly describes the method for setting the 1550nm and 1310nm optical paths. The specific steps of setting the two optical paths on the gyroscope are existing well-known technologies and will not be described in detail here.

[0049] At the same time, this embodiment also provides a redundant three-axis fiber optic gyroscope, which is prepared according to the above-mentioned method for preparing a redundant three-axis fiber optic gyroscope.

Claims

1. A method for preparing a redundant three-axis fiber optic gyroscope, characterized in that: The following steps are involved: Step 1: Prepare the fiber wrapping tooling, fiber wrapping equipment, main optical fiber of preset length and fiber cushion layer optical fiber; Step 2: Use an optical fiber ring making tool and an optical fiber ring winding device to wind and process the main optical fiber and the cushion fiber layer optical fiber to obtain a combination of a main optical fiber ring (10) made of the main optical fiber and a cushion fiber layer ring (16) made of the cushion fiber layer optical fiber, and the combination satisfies the following conditions: a. the main optical fiber ring (10) is located outside the cushion fiber layer ring (16); b. the main optical fiber ring (10) and the cushion fiber layer ring (16) have the same fiber output direction and position; Step 3, prepare a circular fiber ring fixing cavity (18), the inner ring side wall of the fiber ring fixing cavity (18) is provided with a fiber outlet (19); adhere and fix the combination of the main fiber ring (10) and the cushion fiber layer ring (16) in the fiber ring fixing cavity (18); Step 4, lead out the two pigtails of the main optical fiber ring (10) and the two pigtails of the cushion fiber layer ring (16) from the fiber outlet (19), and coil them in different clockwise directions in the middle of the optical fiber ring fixing cavity (18), and the two pigtails of the main optical fiber ring (10) and the two pigtails of the cushion fiber layer ring (16) are located at the same height; Step 5, prepare a first integrated optical modulator (9), a first 1×2 single-mode fiber coupler (8), a first 1×3 single-mode fiber coupler (7), a first photodetector (11) and an erbium-doped fiber light source (6), and connect them to two pigtails of the main fiber ring (10) according to a preset connection method; Step 6, prepare a second integrated optical modulator (15), a second 1×2 single-mode fiber coupler (14), a second 1×3 single-mode fiber coupler (13), a second photodetector (17) and an SLD light source (12), and connect them to two pigtails of the fiber mat ring (16) according to a preset connection method; Step 7, defining the optical fiber ring fixed cavity (18), the first 1×2 single-mode optical fiber coupler (8), the first integrated optical modulator (9), the second 1×2 single-mode optical fiber coupler (14) and the second integrated optical modulator (15) as a device assembly, and installing the device assembly on the first circular inner lining plate of the optical fiber gyroscope; Step 8, repeating steps 3 to 7 twice, the difference being that: installing the other two sets of device assemblies obtained on the second circular inner lining plate and the third circular inner lining plate of the fiber optic gyroscope respectively; Step 9: Install an erbium-doped fiber light source (6), an SLD light source (12), a first 1×3 single-mode fiber coupler (7), a second 1×3 single-mode fiber coupler (13), three first photodetectors (11), and three second photodetectors (17) at a preset position on the platform of the fiber optic gyroscope, and finally obtain a redundant three-axis fiber optic gyroscope.

2. The method for preparing a redundant three-axis fiber optic gyroscope according to claim 1, characterized in that: The optical fiber wrapping tooling described in step 1 comprises a circular first baffle (1) and a second baffle (3), and a skeleton (2) arranged between the first baffle (1) and the second baffle (3), wherein the radial cross-section of the skeleton (2) is a circular ring, and its two ends are respectively connected to the first baffle (1) and the second baffle (3); an arc-shaped first fiber guide groove (4) and a second fiber guide groove (5) are arranged between the outer edge of the inner wall of the second baffle (3) and the outer edge of the skeleton (2), and the first fiber guide groove (4) and the second fiber guide groove (5) are used to guide out two pigtails of the cushion fiber layer ring (16).

3. The method for preparing a redundant three-axis fiber optic gyroscope according to claim 2, characterized in that: The optical fiber ring winding device described in step 2 is a ring winding machine, and the use of the optical fiber ring winding tooling and the optical fiber ring winding device to wind and process the main optical fiber and the fiber cushion layer optical fiber is specifically as follows: The optical fiber ring winding tool is fixed on the ring winding machine by screws, and the cushion fiber layer ring (16) is firstly wound along the outer wall of the skeleton (2). After the winding is completed, the two pigtails of the cushion fiber layer ring (16) are respectively led out from the first fiber guide groove (5) and the second fiber guide groove (5) to the outer edge of the second baffle (3) and fixed with tape. The size of the first fiber guide groove (4) and the second fiber guide groove (5) are adapted to the optical fiber of the cushion fiber layer ring (16), so that the inner side surface of the second baffle (3) is a plane after the pigtail is placed in; then, the main optical fiber ring (10) is wound on the outer side of the cushion fiber layer ring (16) by the same method as that of winding the cushion fiber layer ring (16), and the fiber output direction and position of the main optical fiber ring (10) and the cushion fiber layer ring (16) are the same; finally, the main optical fiber ring (10) and the cushion fiber layer ring (16) are cured and de-skeletonized.

4. The method for preparing a redundant three-axis fiber optic gyroscope according to claim 3, characterized in that: Step 5 is as follows: A first integrated optical modulator (9), a first 1×2 single-mode optical fiber coupler (8), a first 1×3 single-mode optical fiber coupler (7), a first photodetector (11) and an erbium-doped optical fiber light source (6) are prepared; wherein the first integrated optical modulator (9) has two output pigtails and one input pigtail, and the first 1×2 single-mode optical fiber coupler (8) has one common-end pigtail and two other pigtails; the two pigtails of the main optical fiber ring (10) are fused with the two output pigtails of the first integrated optical modulator (9) respectively, and then the input pigtail of the first integrated optical modulator (9) is fused with the common-end pigtail of the first 1×2 single-mode optical fiber coupler (8); finally, the two other pigtails of the first 1×2 single-mode optical fiber coupler (8) are connected to the output end of the first 1×3 single-mode optical fiber coupler (7) and the input end of the first photodetector (11) respectively, and the input end of the first 1×3 single-mode optical fiber coupler (7) is connected to the output end of the erbium-doped optical fiber light source (6); Step 6 is as follows: A second integrated optical modulator (15), a second 1×2 single-mode fiber coupler (14), a second 1×3 single-mode fiber coupler (13), a second photodetector (17) and an SLD light source (12) are prepared; wherein the second integrated optical modulator (15) has two output pigtails and one input pigtail, and the second 1×2 single-mode fiber coupler (14) has one common-end pigtail and two other pigtails; the two pigtails of the mat fiber ring (16) are connected to the second integrated optical modulator (15) The two output pigtails of the second integrated optical modulator (15) are fused respectively, and then the input pigtail of the second integrated optical modulator (15) is fused with the common end pigtail of the second 1×2 single-mode optical fiber coupler (14). Finally, the other two pigtails of the second 1×2 single-mode optical fiber coupler (14) are connected to the output end of the second 1×3 single-mode optical fiber coupler (13) and the input end of the second photodetector (17) respectively, and the input end of the second 1×3 single-mode optical fiber coupler (13) is connected to the output end of the SLD light source (12).

5. The method for preparing a redundant three-axis fiber optic gyroscope according to claim 4, characterized in that: In step 1, the operating wavelength of the main optical fiber is 1550 nm, and the operating wavelength of the cushion layer optical fiber is 1310 nm.

6. A redundant three-axis fiber optic gyroscope, characterized in that: The redundant three-axis fiber optic gyroscope is prepared according to the preparation method of any one of claims 1 to 5.

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