Winding method for solving stress asymmetry of optical fiber ring

Abstract

A winding method for solving stress asymmetry of an optical fiber ring aims to improve the precision and stability of an optical fiber gyroscope, and comprises the following steps: symmetrically and equally dividing an optical fiber with a fixed length into an end A and an end B from the middle point, and respectively carrying out clockwise and anticlockwise alternate winding on two fiber supply wheels to ensure that the winding lengths and stress distribution at the two ends are consistent; the method comprises the following specific steps: winding three circles on each of a first fiber supply wheel and a second fiber supply wheel, and preliminarily fixing the first fiber supply wheel and the second fiber supply wheel; then, mounting on a front winding mechanism and a rear winding mechanism of winding equipment, and respectively rotating clockwise and anticlockwise; and carrying out layered curing by using an ultraviolet resin glue solution, and carrying out on-line aging treatment once every two circles until all circles are finished. According to the method, the process flow is simplified, the problem of stress asymmetry is reduced, more uniform stress distribution is realized through a layered curing strategy, the reciprocity symmetry and zero offset temperature stability of the optical fiber ring are remarkably improved, and the method is suitable for production of high-precision optical fiber gyroscopes.

Description

Technical Field

[0001] The invention relates to the technical field of optical fiber production, and in particular to a winding method for solving asymmetric ring stress of optical fiber. Background Art

[0002] During the manufacturing process of fiber optic gyroscopes, the fiber ring is the core sensitive component of the resonant fiber gyroscope. The parameters such as waveguide crosstalk, stress and strain inside it must be kept highly consistent to ensure the stability and accuracy of the gyroscope performance; especially the stress asymmetry problem, which is one of the main noise sources of waveguide crosstalk and seriously affects the zero-bias stability and accuracy of the gyroscope.

[0003] The traditional fiber wrapping method has the following main problems: 1. The traditional method controls the fiber tension through the tension clamp on the fiber supply reel, but the setting of the tension value requires repeated experiments. Too little tension will cause the fiber to relax after winding, especially when the temperature changes, the stress error will increase; too much tension may damage the fiber; 2. In the traditional method, the optical fiber is only supplied from one side and is always wound in one direction, ignoring the tension balance problem on both sides. This leads to uneven stress distribution at different positions on the optical fiber ring and differences in the curing of the adhesive; 3. The traditional method usually adopts natural curing, but during the curing process, due to stress problems, the curing degree of the adhesive on both sides of the optical fiber ring is inconsistent, which further aggravates the stress asymmetry; 4. Due to the different winding methods of ends A and B, there are significant differences in the curing conditions and stress distribution of the adhesive at both ends. Especially during the thermal expansion and contraction process, the harder cured end cannot effectively eliminate the stress caused by temperature changes, resulting in increased stress errors. Summary of the invention

[0004] In summary, the traditional fiber winding method fails to fully solve the problem of stress asymmetry at both ends, resulting in a high error in the fiber ring stress after winding, which affects the overall performance and reliability of the fiber optic gyroscope. Therefore, developing a method that can effectively solve the asymmetric fiber ring stress is of great significance for improving the accuracy and stability of the fiber optic gyroscope.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve: A winding method for solving asymmetric stress of optical fiber ring, the method comprising the following steps: S1. Divide the fixed length of optical fiber into two equal parts according to the principle of midpoint symmetry, which are defined as end A and end B respectively; S2, wind the fiber A end on the first fiber supply wheel clockwise, and wind the fiber B end on the second fiber supply wheel counterclockwise, with a winding diameter of 15 mm. After winding 3 turns, fix the two ends of the optical fiber with adhesive; S3, installing the wound first fiber supply wheel and the second fiber supply wheel on the front and rear winding mechanisms of the winding device, wherein the winding mechanism installed with the first fiber supply wheel rotates clockwise, and the winding mechanism installed with the second fiber supply wheel rotates counterclockwise; S4. Use adhesives such as ultraviolet resin to firmly connect the optical fiber ring to the fiber supply wheel and the optical fiber ring fixing bracket. The adhesive is a liquid or gel with low viscosity and is fixed at room temperature. S5. Wind the optical fiber ring according to the quadrupole symmetrical winding method, and perform online aging treatment after every two turns until all turns are completed; S6. After winding is completed, reduce the speed of the winding machine to 10r / min, take the optical fiber ring out of the winding device, and perform secondary aging and curing treatment at a temperature of 30°C to 60°C. The curing time is controlled between 3h and 8h.

[0006] In a preferred solution, in S4, the temperature of the aging treatment is controlled between 30°C and 60°C, and the curing time is controlled to be more than 3 hours to ensure that the UV curing adhesive is fully cured and complete the online aging process of the optical fiber ring.

[0007] In a preferred solution, in S3, the rotation speed n of the winding mechanism must satisfy the formula: n=2π(R1+R2) / (TL0); Wherein: R1 and R2 are the winding radii of the two fiber supply wheels respectively; L0 is the total length of the optical fiber; T is the time; and R1 = R2, so as to ensure the uniformity and stability of the optical fiber ring.

[0008] In a preferred solution, in S3, when the fiber winding radius is greater than 2.5 m and the speed is less than 1000 r / min, the winding mechanism of the fiber supply wheel adopts a fiber winding machine with a fixed speed; When the optical fiber winding radius is greater than 5m and the speed is less than 1000r / min, the winding mechanism of the fiber supply wheel adopts a fixed radius optical fiber winding machine.

[0009] In a preferred solution, in S4, the optical fiber ring has a quadrupole symmetrical structure, which can effectively solve the problem of asymmetric stress at ends A and B of the optical fiber ring and improve the zero-bias temperature stability and accuracy index of the optical fiber ring.

[0010] In a preferred solution, in S5, the specific steps of winding the optical fiber ring according to the quadrupole symmetrical winding method are as follows: S5.1. Confirm that the winding equipment has been debugged to the best working state, prepare the required UV resin glue, and ensure that its viscosity is moderate; S5.2. Wind the A and B ends of the optical fiber around the front and rear fiber supply wheels respectively, ensuring that the winding diameter is 15 mm. After winding 3 times, use ultraviolet resin glue to initially fix the two ends to form a stable starting point. Use ultraviolet light to irradiate the initially fixed parts to ensure that the glue solidifies in a short time to provide sufficient bonding strength. S5.3, set the speed of the winding device to 60r / min, and start winding the optical fiber ring according to the quadrupole symmetrical winding method; S5.4. After completing every two turns of winding, immediately carry out online aging treatment. The specific steps are as follows: S5.41. Use a UV resin glue roller to evenly apply the glue to the two newly wound optical fibers, ensuring that the glue is evenly covered without bubbles or gaps. S5.42. Use an ultraviolet light source to irradiate the optical fiber coated with the glue to ensure that the glue is completely cured in a short time; S5.43. Use appropriate tools to check the surface of the cured optical fiber to ensure that the glue has been completely cured and the optical fiber is firmly bonded without looseness or deformation; S5.5. After the online aging treatment is completed, continue to wind the next group of two turns according to the quadrupole symmetrical winding method, and repeat the above steps until all the predetermined number of turns are completed; S5.6. When all the predetermined number of windings are completed, confirm the winding quality of the last layer and the effect of the online aging treatment to ensure that the overall structure of the optical fiber ring is stable and the stress distribution is uniform; S5.7. Record the key parameters of the entire winding and online aging process (such as winding speed, adhesive type, UV exposure time, etc.) and keep them on file for future reference.

[0011] In the preferred solution, in S5.3, the specific operation of the four-pole symmetrical winding method is to place each pole adjacent to each other, and alternately wind it clockwise or counterclockwise. The specific method is to wind the first layer from the first fiber supply wheel clockwise, the second layer from the second fiber supply wheel counterclockwise, and so on.

[0012] In the preferred scheme, in steps S5.3 to S5.5, the winding quality of the optical fiber ring needs to be checked regularly to ensure that each layer is wound evenly and tightly without obvious defects or abnormalities; if uneven winding and uneven application of glue are found, it is necessary to adjust the winding parameters in time or re-wind and age the layer.

[0013] A winding method for solving the asymmetric stress of optical fiber ring, the beneficial effects of which include but are not limited to the following points: 1. The present invention divides the optical fiber midpoint into two equal parts symmetrically, and performs clockwise and counterclockwise winding on two fiber supply wheels, respectively, to ensure that the winding length and stress distribution of the A and B ends are consistent. Compared with the traditional method, the present invention does not require an additional winding process, simplifies the process flow, and significantly reduces the stress asymmetry problem of the A and B ends of the optical fiber ring; 2. In the present invention, by curing every two layers, the traditional overall curing method from outside to inside is converted into a curing unit with every two layers. This method not only ensures the symmetry of the winding arrangement, but also effectively ensures the symmetry of the clockwise and counterclockwise fiber stress of the fiber ring. The strategy of curing every two layers significantly reduces the fiber stress deviation and improves the reciprocal symmetry of the fiber ring, thereby solving the problem of uneven stress caused by overall curing in the traditional method; 3. Through layered solidification, the present invention can transform the original pyramid-shaped stress curve into a flattened stress distribution, making the stress inside the fiber ring more uniform. This flattened stress distribution ensures that the stress at the A and B ends of the fiber ring is symmetrical and uniform, greatly improving the performance of the fiber optic gyroscope. Especially in high-precision applications, the uniform stress distribution can significantly reduce waveguide crosstalk and other noise sources, and improve the stability and accuracy of the system; 4. The operation process of the present invention is concise and clear, the winding and aging treatment steps are compact, no additional process or complex equipment is added, the production cost is reduced, and the production efficiency is improved. At the same time, the method is easy to implement and suitable for large-scale production, ensuring the quality and consistency of the optical fiber ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The optical fiber ring stress diagram obtained by the existing optical fiber ring preparation method of the present invention; Figure 2 The optical fiber ring stress diagram obtained by the method of the present invention; Figure 3 This is a schematic diagram of layered solidification during the manufacturing process of the method of the present invention. DETAILED DESCRIPTION

[0015] Embodiment 1: A winding method for solving the asymmetric stress of an optical fiber ring, the specific steps are as follows: S1. Divide a fixed length of 100m full-temperature optical fiber (such as FS-TA100) into two parts according to the principle of midpoint symmetry, which are defined as end A and end B. Ensure that the length of each section of optical fiber is 50m; the purpose is to ensure that the length of ends A and B is consistent through midpoint symmetry, which provides a basis for subsequent winding; S2, winding end A on the first fiber supply wheel clockwise, with a winding diameter of 15 mm, and after winding 3 turns, preliminarily fix end A with ultraviolet resin adhesive; Wrap the B end counterclockwise on the second fiber supply wheel, with the same winding diameter of 15mm. After winding 3 times, use ultraviolet resin adhesive to initially fix the B end. S3, installing the wound first fiber supply wheel on the front winding mechanism of the winding device, and the mechanism rotates clockwise; The wound second fiber supply wheel is mounted on the rear winding mechanism of the winding device, and the mechanism rotates counterclockwise; The speed n of the winding mechanism must satisfy the formula: ; R1 and R2 are the winding radii of the two fiber supply wheels (both are 4.6m), L0 is the total length of the optical fiber (100m), and T is the time; The calculated speed n is 60r / min; S4. Use adhesives such as ultraviolet resin to firmly connect the optical fiber ring to the fiber supply wheel and the optical fiber ring fixing bracket. The adhesive should be a liquid or gel with low viscosity, and fixed at room temperature to ensure a firm connection between the optical fiber ring, the fiber supply wheel and the bracket; S5. Wind the optical fiber ring according to the quadrupole symmetrical winding method, and perform online aging treatment after every two turns until all turns are completed. The specific steps are as follows: S5.1. Confirm that the winding equipment has been debugged to the best working state, prepare the required UV resin glue, and ensure that its viscosity is moderate; S5.2. Wind the A and B ends of the optical fiber around the front and rear fiber supply wheels respectively, ensuring that the winding diameter is 15 mm. After winding 3 times, use ultraviolet resin glue to initially fix the two ends to form a stable starting point. Use ultraviolet light to irradiate the initially fixed parts to ensure that the glue solidifies in a short time to provide sufficient bonding strength. S5.3, set the speed of the winding device to 60r / min, and start winding the optical fiber ring according to the four-pole symmetrical winding method; the specific operation of the four-pole symmetrical winding method is to place each pole adjacent to each other, and alternately wind it clockwise or counterclockwise, specifically starting from the first layer from the first fiber supply wheel clockwise, the second layer from the second fiber supply wheel counterclockwise, and so on; S5.4. After completing every two turns of winding, immediately carry out online aging treatment. The specific steps are as follows: S5.41. Use a UV resin glue roller to evenly apply the glue to the two newly wound optical fibers, ensuring that the glue is evenly covered without bubbles or gaps. S5.42. Use an ultraviolet light source to irradiate the optical fiber coated with the glue to ensure that the glue is completely cured in a short time; S5.43. Use appropriate tools to check the surface of the cured optical fiber to ensure that the glue has been completely cured and the optical fiber is firmly bonded without looseness or deformation; S5.5. After the online aging treatment is completed, continue to wind the next group of two turns according to the quadrupole symmetrical winding method, and repeat the above steps until all the predetermined number of turns are completed; S5.6. When all the predetermined number of windings are completed, confirm the winding quality of the last layer and the effect of the online aging treatment to ensure that the overall structure of the optical fiber ring is stable and the stress distribution is uniform; S5.7. Record the key parameters of the entire winding and online aging process (such as winding speed, adhesive type, UV exposure time, etc.) and keep them on file for future reference.

[0016] Embodiment 2: A winding method applicable to optical fibers of different bands and types, the specific steps are as follows: S1. Select different wavelengths (such as 1.5μm and 2μm) and types of optical fibers (such as single-mode fiber and polarization-maintaining fiber), and divide them into two parts according to the principle of midpoint symmetry, which are defined as end A and end B respectively; S2, according to step S2 in Example 1, initially winding and fixing the A end and the B end on two fiber supply wheels respectively; S3, according to step S3 in embodiment 1, the wound fiber supply wheel is installed on the front and rear winding mechanisms of the winding device, and the rotation speed and winding direction are ensured to meet the requirements; S4, according to step S4 in Example 1, using ultraviolet resin adhesive to firmly connect the optical fiber ring with the fiber supply wheel and the fixed bracket; S5. According to step S5 in Example 1, quadrupole symmetrical winding and online aging treatment are performed to ensure that curing is performed once every two turns; S6. According to step S6 in Example 1, a secondary aging and curing treatment is performed to ensure the stability and uniformity of stress distribution of optical fibers of different bands and types.

[0017] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from all points of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention; any reference numerals in the claims should not be regarded as limiting the claims involved.

Claims

1. A winding method for solving the asymmetric stress of optical fiber ring, characterized in that: The method comprises the following steps: S1. Divide the fixed length of optical fiber into two equal parts according to the principle of midpoint symmetry, which are defined as end A and end B respectively; S2, wind the fiber A end on the first fiber supply wheel clockwise, and wind the fiber B end on the second fiber supply wheel counterclockwise, with a winding diameter of 15 mm. After winding 3 turns, fix the two ends of the optical fiber with adhesive; S3, installing the wound first fiber supply wheel and the second fiber supply wheel on the front and rear winding mechanisms of the winding device, wherein the winding mechanism installed with the first fiber supply wheel rotates clockwise, and the winding mechanism installed with the second fiber supply wheel rotates counterclockwise; S4. Use adhesives such as ultraviolet resin to firmly connect the optical fiber ring to the fiber supply wheel and the optical fiber ring fixing bracket. The adhesive is a liquid or gel with low viscosity and is fixed at room temperature. S5. Wind the optical fiber ring according to the quadrupole symmetrical winding method, and perform online aging treatment after every two turns until all turns are completed; S6. After winding is completed, reduce the speed of the winding machine to 10r / min, take the optical fiber ring out of the winding device, and perform secondary aging and curing treatment at a temperature of 30°C to 60°C. The curing time is controlled between 3h and 8h.

2. The winding method for solving the asymmetric ring stress of optical fiber according to claim 1, characterized in that: In S4, the temperature of the aging treatment is controlled between 30°C and 60°C, and the curing time is controlled to be more than 3 hours to ensure that the ultraviolet curing adhesive is fully cured and complete the online aging process of the optical fiber ring.

3. The winding method for solving the asymmetric stress of optical fiber ring according to claim 1, characterized in that: In S3, the rotation speed n of the winding mechanism must satisfy the formula: n=2π(R1+R2) / (TL0); Wherein: R1 and R2 are the winding radii of the two fiber supply wheels respectively; L0 is the total length of the optical fiber; T is the time; and R1 = R2, so as to ensure the uniformity and stability of the optical fiber ring.

4. The winding method for solving the asymmetric ring stress of optical fiber according to claim 1, characterized in that: In S3, when the fiber winding radius is greater than 2.5 m and the speed is less than 1000 r / min, the winding mechanism of the fiber supply wheel adopts a fiber winding machine with a fixed speed; When the optical fiber winding radius is greater than 5m and the speed is less than 1000r / min, the winding mechanism of the fiber supply wheel adopts a fixed radius optical fiber winding machine.

5. The winding method for solving the asymmetric stress of optical fiber ring according to claim 1, characterized in that: In S4, the optical fiber ring has a quadrupole symmetrical structure, which can effectively solve the problem of asymmetric stress at ends A and B of the optical fiber ring and improve the zero-bias temperature stability and accuracy index of the optical fiber ring.

6. The winding method for solving the asymmetric ring stress of optical fiber according to claim 1, characterized in that: In S5, the specific steps of winding the optical fiber ring according to the quadrupole symmetrical winding method are as follows: S5.

1. Confirm that the winding equipment has been debugged to the best working state, prepare the required UV resin glue, and ensure that its viscosity is moderate; S5.

2. Wind the A and B ends of the optical fiber around the front and rear fiber supply wheels respectively, ensuring that the winding diameter is 15 mm. After winding 3 times, use ultraviolet resin glue to initially fix the two ends to form a stable starting point. Use ultraviolet light to irradiate the initially fixed parts to ensure that the glue solidifies in a short time to provide sufficient bonding strength. S5.3, set the speed of the winding device to 60r / min, and start winding the optical fiber ring according to the quadrupole symmetrical winding method; S5.

4. After completing every two turns of winding, immediately carry out online aging treatment. The specific steps are as follows: S5.

41. Use a UV resin glue roller to evenly apply the glue to the two newly wound optical fibers, ensuring that the glue is evenly covered without bubbles or gaps. S5.

42. Use an ultraviolet light source to irradiate the optical fiber coated with the glue to ensure that the glue is completely cured in a short time; S5.

43. Use appropriate tools to check the surface of the cured optical fiber to ensure that the glue has been completely cured and the optical fiber is firmly bonded without looseness or deformation; S5.

5. After the online aging treatment is completed, continue to wind the next group of two turns according to the quadrupole symmetrical winding method, and repeat the above steps until all the predetermined number of turns are completed; S5.

6. When all the predetermined number of windings are completed, confirm the winding quality of the last layer and the effect of the online aging treatment to ensure that the overall structure of the optical fiber ring is stable and the stress distribution is uniform; S5.

7. Record the key parameters of the entire winding and online aging process (such as winding speed, adhesive type, UV exposure time, etc.) and keep them on file for future reference.

7. The winding method for solving the asymmetric ring stress of optical fiber according to claim 6, characterized in that: In S5.3, the specific operation of the four-pole symmetrical winding method is to place each pole adjacent to each other, and alternately wind it clockwise or counterclockwise. The specific method is to wind the first layer from the first fiber supply wheel clockwise, the second layer from the second fiber supply wheel counterclockwise, and so on.

8. The winding method for solving the asymmetric ring stress of optical fiber according to claim 6, characterized in that: In S5.3~S5.5, the winding quality of the optical fiber ring needs to be checked regularly to ensure that each layer is wound evenly and tightly without obvious defects or abnormalities; If uneven winding and uneven glue application are found, it is necessary to adjust the winding parameters in time or re-wind and age the layer.

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