CN115855120A - Optical fiber coil, manufacturing method thereof and optical fiber gyroscope - Google Patents
Optical fiber coil, manufacturing method thereof and optical fiber gyroscope Download PDFInfo
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- CN115855120A CN115855120A CN202310168862.4A CN202310168862A CN115855120A CN 115855120 A CN115855120 A CN 115855120A CN 202310168862 A CN202310168862 A CN 202310168862A CN 115855120 A CN115855120 A CN 115855120A
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Abstract
The invention belongs to the technical field of fiber optic gyroscopes, and relates to a fiber optic coil, a manufacturing method thereof and a fiber optic gyroscope, wherein the fiber optic coil comprises an optical fiber layer, a colloid and a low-expansion coefficient material layer; the colloid is filled between the optical fibers of the optical fiber layer, the optical fiber layer and the low expansion coefficient material layer are arranged at intervals in the radial direction of the optical fiber coil, and the linear expansion coefficient of the low expansion coefficient material layer is smaller than that of the colloid. A manufacturing method of an optical fiber coil comprises the steps that low-expansion-coefficient material layers are arranged between optical fiber layers, the optical fiber layers and the low-expansion-coefficient material layers are arranged at intervals in the radial direction of the optical fiber coil, and the linear expansion coefficient of the low-expansion-coefficient material layers is smaller than that of a colloid. The low expansion coefficient material layer dispersedly bears the stress generated when the colloid is excited by the external temperature, the low expansion coefficient material layer inhibits the deformation of the colloid, the deformation of the colloid becomes small, the changes of the length and the diameter of the optical fiber in the optical fiber layer are reduced, and the stability of the scale factor of the optical fiber gyroscope is improved.
Description
Technical Field
The invention belongs to the technical field of fiber optic gyroscopes, and particularly relates to a fiber optic coil, a manufacturing method thereof and a fiber optic gyroscope.
Background
The fiber optic gyroscope is a fiber optic angular rate sensor based on the Sagnac effect, and has the advantages of small volume, light weight, high precision, full solid state, long service life, strong shock resistance, large dynamic range and the like. Based on the advantages, the fiber-optic gyroscope inertial navigation system is widely applied to various fields of sea, land and air, and becomes an ideal inertial device in the inertial navigation system.
With the continuous progress of the optical fiber gyroscope technology and the gradual popularization of system application, the application requirements of various fields on the high-precision optical fiber gyroscope are increasingly urgent, and particularly in some long-endurance high-precision water surface and underwater application occasions, the high-precision optical fiber gyroscope is required to have high precision, and meanwhile, higher requirements are provided for the continuous long-term working scale factor stability of the gyroscope.
According to the working principle of the fiber-optic gyroscope, the phase formula caused by the Sagnac effect is as follows:
in the formula:
phase shifting Sagnac; l is the length of the optical fiber coil; d is the diameter of an equivalent circle formed by the closed light path of the light coil; />
Is the average wavelength of the light source; c is the speed of light in vacuum; Ω is the angular rate of the fiber; />
Is the scale factor of the fiber-optic gyroscope,
. From equation (1), the scale factor inherent to the fiber optic gyroscope is proportional to the length and diameter of the fiber optic coil and inversely proportional to the average wavelength of the light source.
The scale factor of the fiber-optic gyroscope is an important index for characterizing the performance of the gyroscope. The scale factor is the ratio of the output quantity of the fiber-optic gyroscope to the input angular rate, can be represented by a certain specific straight line slope on the coordinate axis, is an index reflecting the sensitivity of the gyroscope, has the stability and the accuracy which are important indexes of the fiber-optic gyroscope, and comprehensively reflects the test and fitting accuracy of the fiber-optic gyroscope. The stability of the scale factors is dimensionless and is usually expressed in parts per million (ppm). The errors in the scale factors are mainly due to temperature variations and instability of the polarization state of the fiber.
The fiber optic gyroscope, especially the high precision fiber optic gyroscope, has very high requirements for the stability of the scale factor, and usually requires control to be in the range of several ppm (parts per million). The stability of the average wavelength of the light source at present can be controlled within 1-2 ppm, which can be ignored, and the change of the length (L) and the diameter (D) of the optical fiber coil affects the main error source of the stability of the scale factor of the high-precision optical fiber gyroscope.
The optical fiber coil is a core sensitive component of the high-precision optical fiber gyroscope, and the temperature performance stability and the anti-interference capability of the optical fiber coil are main factors influencing the performance of the high-precision optical fiber gyroscope. The optical fiber gyroscope has high precision requirement, and the length and the diameter of a coil to be wound are long and large, the length of the wound coil reaches thousands of meters, even dozens of kilometers, and the diameter of the coil is also more than 100 mm. Because the optical fiber required by coil manufacture is long and large in diameter, the number of winding layers is large, and the winding symmetry of the coil is difficult to guarantee, the coil is sensitive to the influence of external environmental factors after the ring is formed, and the environmental factors are usually distributed on the whole optical fiber ring unevenly. Because the coil has the inevitable problems of uneven filling colloid, uneven winding stress, uneven curing stress and the like, the optical fiber coil is influenced by the external environment frequently for a long time and can be deformed in the axial direction and the radial direction. The coil shape variable is mainly influenced by the modulus of the filled colloid, the linear expansion coefficient, the winding stress, the curing stress and the long-term reliability of the colloid. The deformation of the coil causes the length (L) and the diameter (D) in the scale factor KSF formula to change, so that the scale factor stability of the fiber-optic gyroscope is influenced, and the stability of the fiber-optic gyroscope is reduced, so that the deformation of the fiber-optic coil is effectively inhibited, and the effective inhibition of the change of the length (L) and the diameter (D) of the fiber-optic coil is one of the main methods for stabilizing the scale factor of the gyroscope.
The problems existing at present are that: because the optical fiber wound by the coil for the optical fiber gyroscope has long length, large diameter and thick layer number, the optical fiber is easy to generate axial and radial deformation after being excited by environmental factors and releasing stress when working for a long time in the optical fiber gyroscope, and the scale factor stability of the optical fiber gyroscope is reduced.
Disclosure of Invention
The invention aims to provide an optical fiber coil, a manufacturing method thereof and an optical fiber gyroscope, which reduce axial and radial deformation of a coil part of the optical fiber coil in the optical fiber gyroscope, improve the scale factor stability of the optical fiber gyroscope and further improve the performance of the optical fiber gyroscope.
In order to solve the technical problems, the invention adopts the following technical scheme.
The optical fiber coil provided by the invention comprises an optical fiber layer, a colloid and a low-expansion-coefficient material layer; the colloid is filled between the optical fibers of the optical fiber layer, the optical fiber layer and the low expansion coefficient material layer are arranged at intervals in the radial direction of the optical fiber coil, and the linear expansion coefficient of the low expansion coefficient material layer is smaller than that of the colloid.
According to the optical fiber coil provided by the invention, a layer of low-expansion coefficient material is arranged between adjacent optical fiber layers.
According to the optical fiber coil provided by the invention, the low-expansion-coefficient material layer is in a mesh shape with holes, and a plurality of holes are uniformly distributed in the low-expansion-coefficient material layer.
The invention also provides a manufacturing method of the optical fiber coil, which comprises the following steps: the optical fiber coil is characterized in that low-expansion-coefficient material layers are arranged between the optical fiber layers, the optical fiber layers and the low-expansion-coefficient material layers are arranged at intervals in the radial direction of the optical fiber coil, and the linear expansion coefficient of the low-expansion-coefficient material layers is smaller than that of the colloid.
According to the manufacturing method of the optical fiber coil, before the low-expansion-coefficient material layer is arranged between the optical fiber layers, the optical fiber layers are formed by winding optical fibers soaked with glue.
According to the manufacturing method of the optical fiber coil provided by the invention, the step of arranging the low-expansion coefficient material layer between the optical fiber layers further comprises the following steps: a layer of low expansion coefficient material is arranged between the adjacent optical fiber layers.
According to the manufacturing method of the optical fiber coil, the low-expansion-coefficient material layer is in a mesh shape with holes.
According to the manufacturing method of the optical fiber coil provided by the invention, the step of arranging a layer of low-expansion coefficient material layer between adjacent optical fiber layers further comprises the following steps: the method comprises the following steps: winding the optical fiber around the ring winding tool into a first optical fiber layer; step two: the low-expansion-coefficient material surrounds the surface of the first layer of optical fiber layer to form a first layer of low-expansion-coefficient material layer; step three: winding the optical fiber on the surface of the first layer of low-expansion coefficient material layer, and forming a second layer of optical fiber layer on the surface of the second layer of low-expansion coefficient material layer; and continuing to surround the optical fiber layer and the low-expansion-coefficient material layer to a ring winding tool according to the method in the first step, the second step and the third step until the last layer of optical fiber is wound into the last layer of optical fiber layer to form the optical fiber coil.
According to the manufacturing method of the optical fiber coil, in the second step, the low-expansion-coefficient material is a magnetic material, the magnetic adsorption device is installed on the inner side of the winding tool, and the low-expansion-coefficient material is adsorbed and wound on the surface of the first optical fiber layer by the magnetic force of the magnetic adsorption device to form the first low-expansion-coefficient material layer.
The invention also provides a fiber-optic gyroscope which comprises the fiber-optic coil manufactured by the manufacturing method of the fiber-optic coil.
The invention has the following beneficial effects:
1) The linear expansion coefficient of the low-expansion coefficient material layer is smaller than that of the colloid, so that the low-expansion coefficient material layer dispersedly bears stress generated when the colloid is excited by external temperature, the low-expansion coefficient material layer inhibits deformation of the colloid, the deformation of the colloid is reduced, the changes of the length (L) and the diameter (D) of the optical fiber in the optical fiber layer are reduced, and the stability of the scale factor of the optical fiber gyroscope is improved.
2) The low-expansion-coefficient material layer is arranged between the adjacent optical fiber layers, so that the deformation of colloid between the adjacent optical fibers is inhibited by the low-expansion-coefficient material layer, the change of the length (L) and the diameter (D) of the optical fibers in the optical fiber layers is further reduced, and the stability of the scale factor of the optical fiber gyroscope is further improved.
3) The low coefficient of expansion material layer can separate optical fiber layer and colloid partly, and foraminiferous netted low coefficient of expansion material layer is favorable to the colloid to pass the hole, is favorable to the optical fiber layer fully to be immersed in the colloid, has improved the homogeneity of environmental factor at optical fiber coil's distribution. Foraminiferous reticular low expansion coefficient material layer is favorable to the colloid to pass the hole, can also prevent the optical fiber layer layering of low expansion coefficient material layer both sides, prevents that light coil from becoming loose, has improved optical fiber coil's stability.
4) Before the low-expansion-coefficient material layer is arranged between the optical fiber layers, the optical fiber layers are formed by winding the optical fibers soaked with glue, so that glue is soaked at each position of the optical fibers before winding, the combination degree of the optical fibers and the glue is improved, each layer of optical fibers are fully positioned in the glue environment, the glue is uniformly filled, and in the later period, the distribution of environmental factors on an optical fiber ring of the optical fiber gyro is uniform, so that the change of the length (L) and the diameter (D) of the optical fibers in the optical fiber layers is further reduced, and the stability of the scale factor of the optical fiber gyro is further improved.
5) The low expansion coefficient material is adsorbed and surrounded on the surface of the first layer of optical fiber layer by magnetic force, so that the performance of the optical fiber coil is not influenced by the additionally added adhesive substance, and the efficiency of the low expansion coefficient material surrounding the surface of the optical fiber layer is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a conventional fiber optic coil of the prior art.
Fig. 2 is a modified fiber optic coil in accordance with the present invention.
FIG. 3 is a low expansion coefficient material layer of the fiber optic coil of the present invention.
FIG. 4 is a process part of a method of making a fiber optic coil according to the present invention.
Reference numerals:
1. an optical fiber layer; 2. a low coefficient of expansion material layer; 3. a colloid; 4. an aperture; 5. a low expansion coefficient material; 6. a first optical fiber layer; 7. a magnetic adsorption device; 8. a ring winding tool; 9. an optical fiber on the first fiber supply wheel; 10. an optical fiber on the second fiber supply wheel; 11. a rotating wheel of low expansion coefficient material.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "central", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
The invention is described below with reference to the accompanying drawings.
The first embodiment is as follows: an optical fiber coil comprises an optical fiber layer 1, a colloid 3 and a low-expansion-coefficient material layer 2; the colloid 3 is filled between the optical fibers of the optical fiber layer 1, the optical fiber layer 1 and the low expansion coefficient material layer 2 are arranged at intervals in the radial direction of the optical fiber coil, and the linear expansion coefficient of the low expansion coefficient material layer 2 is smaller than that of the colloid 3.
Because the coil has the inevitable problems of uneven filling colloid 3, uneven winding stress, uneven curing stress and the like, the deformation quantity of the coil in the axial direction and the radial direction is mainly influenced by the modulus of the filling colloid 3, the linear expansion coefficient, the winding stress, the curing stress and the long-term reliability of the colloid 3, and the optical fiber coil is influenced by the external environment frequently for a long time to cause the deformation of the optical fiber coil in the axial direction and the radial direction (as shown in figure 1). Coefficient of linear expansion, also called coefficient of linear expansion. The linear expansion coefficient of the low-expansion-coefficient material layer 2 is smaller than that of the colloid 3, so that the low-expansion-coefficient material layer 2 dispersedly bears stress generated when the colloid 3 is excited by external temperature, the low-expansion-coefficient material layer 2 inhibits deformation of the colloid 3, deformation of the colloid 3 is reduced, changes of the length (L) and the diameter (D) of the optical fiber in the optical fiber layer 1 are reduced, and accordingly stability of the scale factor of the optical fiber gyroscope is improved.
Preferably, the material of colloid 3 is an epoxy resin polymer, and more preferably, the material of colloid 3 is an epoxy acrylate polymer. The linear expansion coefficient of the epoxy acrylate polymer colloid 3 is generally more than 70 multiplied by 10 -6 。
Preferably, the low expansion coefficient material 5 is carbon fiber, pure titanium, a titanium alloy, an iron-nickel low expansion alloy, an iron-chromium low expansion alloy, or the like.
Preferably, the low coefficient of expansion material layer 2 has a coefficient of linear expansion of less than 10 x 10 -6 About 1 order of magnitude lower than that of colloid 3.
Preferably, the winding method of the optical fiber coil is four-level symmetrical winding method, eight-level symmetrical winding method and sixteen-level symmetrical winding method, so that the symmetry degree of the optical fiber coil is better, and the precision of the optical fiber gyroscope is higher.
Preferably, the optical fiber coil is a frameless coil, so that the optical fiber coil has better symmetry and the precision of the optical fiber gyroscope is higher.
Example two: the improvement is carried out on the basis of the optical fiber coil in the first embodiment. A layer 2 of low expansion coefficient material is arranged between adjacent optical fiber layers 1.
In this way, the deformation of the colloid 3 between adjacent optical fibers is inhibited by the low expansion coefficient material layer 2, so that the change of the length (L) and the diameter (D) of the optical fibers in the optical fiber layer 1 is further reduced, and the stability of the scale factor of the fiber-optic gyroscope is further improved (as shown in FIG. 2).
Example three: the improvement is made on the basis of the optical fiber coil in the first embodiment. The low expansion coefficient material layer 2 is in the shape of a net with holes 4, and a plurality of holes 4 are uniformly distributed on the low expansion coefficient material layer 2.
The low coefficient of expansion material layer 2 can separate optical fiber layer 1 and colloid 3 partly, and the netted low coefficient of expansion material layer 2 of foraminiferous 4 is favorable to colloid 3 to pass hole 4, is favorable to optical fiber layer 1 fully to be immersed in colloid 3, has improved the homogeneity of environmental factor at the distribution of optical fiber coil. The reticular low-expansion-coefficient material layer 2 with the holes 4 is beneficial to the colloid 3 to pass through the holes 4, and can also prevent the optical fiber layer 1 layering on the two sides of the low-expansion-coefficient material layer 2, so that the optical fiber coil is prevented from loosening, and the stability of the optical fiber coil is improved.
Preferably, the thickness of the low expansion coefficient material layer 2 in the radial direction of the optical fiber coil is 0.05 to 0.20 of the diameter of the optical fiber. The excessively thick low expansion coefficient material layer 2 can cause the thickness of the optical fiber coil to be obviously increased, the installation of the optical fiber coil in a limited space can be limited, and the difficulty of the optical fiber winding process can be increased. The thickness of the low expansion coefficient material layer 2 in the radial direction of the optical fiber coil is 0.05-0.20 of the diameter of the optical fiber, thus, the low expansion coefficient material layer 2 with the thickness can effectively inhibit the deformation of the colloid 3, the change of the length (L) and the diameter (D) of the optical fiber in the optical fiber layer 1 is effectively reduced, and meanwhile, the low expansion coefficient material layer 2 with the thickness cannot occupy too much thickness in the radial direction of the optical fiber coil, so that the volume of the whole optical fiber coil cannot be excessively increased, the optical fiber coil cannot be limited when being installed in a limited space, and the difficulty of the process for winding the optical fiber cannot be increased on the other hand.
Preferably, the width of the low-expansion-coefficient material layer 2 in the axial direction of the optical fiber coil is consistent with the width of the optical fiber layer 1 in the axial direction of the optical fiber coil, so that the edge of the low-expansion-coefficient material layer 2 on the optical fiber layer 1 is smooth, the symmetry of the optical fiber coil is better, and the precision of the optical fiber gyroscope is higher. A plurality of holes 4 are uniformly distributed in the low expansion coefficient material layer 2.
A plurality of holes 4 are uniformly distributed in the low-expansion-coefficient material layer 2, so that the optical fiber layer 1 is favorably and uniformly immersed in the colloid 3, the low-expansion-coefficient material layer 2 uniformly bears the stress generated when the colloid 3 is excited by the external temperature, the symmetry degree of the optical fiber coil is better, the distribution uniformity of environmental factors in the optical fiber coil is further improved, and the precision of the optical fiber gyroscope is higher.
Preferably, the shape of the holes 4 is a regular hexagon. The colloid 3 has certain impact on the low expansion coefficient material layer 2 due to stress and deformation generated when being excited by external temperature, and the shape of the hole 4 is a regular hexagon, so that the low expansion coefficient material layer 2 has stronger capability of bearing the impact, and the low expansion coefficient material layer 2 has good structural stability (as shown in figure 3).
Example four: a manufacturing method of an optical fiber coil comprises the steps that low-expansion-coefficient material layers 2 are arranged between optical fiber layers 1, the optical fiber layers 1 and the low-expansion-coefficient material layers 2 are arranged in the radial direction of the optical fiber coil at intervals, colloid 3 is filled between optical fibers of the optical fiber layers 1, and the linear expansion coefficient of the low-expansion-coefficient material layers 2 is smaller than that of the colloid 3.
Because the coil has the inevitable problems of uneven filling colloid 3, uneven winding stress, uneven curing stress and the like, the deformation quantity of the coil in the axial direction and the radial direction is mainly influenced by the modulus of the filling colloid 3, the linear expansion coefficient, the winding stress, the curing stress and the long-term reliability of the colloid 3, and the optical fiber coil is influenced by the external environment frequently for a long time to cause the deformation of the optical fiber coil in the axial direction and the radial direction (as shown in figure 1). Coefficient of linear expansion, also called coefficient of linear expansion. The linear expansion coefficient of the low-expansion-coefficient material layer 2 is smaller than that of the colloid 3, so that the low-expansion-coefficient material layer 2 dispersedly bears stress generated when the colloid 3 is excited by external temperature, the low-expansion-coefficient material layer 2 inhibits deformation of the colloid 3, deformation of the colloid 3 is reduced, changes of the length (L) and the diameter (D) of the optical fiber in the optical fiber layer 1 are reduced, and accordingly stability of the scale factor of the optical fiber gyroscope is improved.
Preferably, the material of colloid 3 is an epoxy resin polymer, and more preferably, the material of colloid 3 is an epoxy acrylate polymer. The linear expansion coefficient of the epoxy acrylate polymer colloid 3 is generally more than 70 x 10-6.
Preferably, the low expansion coefficient material 5 is carbon fiber, pure titanium, a titanium alloy, an iron-nickel low expansion alloy, an iron-chromium low expansion alloy, or the like.
Preferably, the low coefficient of expansion material layer 2 has a coefficient of linear expansion of less than 10 x 10-6, about 1 order of magnitude lower than that of the gel 3.
Preferably, the winding method of the optical fiber coil is four-level symmetrical winding method, eight-level symmetrical winding method and sixteen-level symmetrical winding method, so that the symmetry degree of the optical fiber coil is better, and the precision of the optical fiber gyroscope is higher.
Preferably, the optical fiber coil is a frameless coil, so that the optical fiber coil has better symmetry and the optical fiber gyroscope has higher precision.
Example five: the manufacturing method of the optical fiber coil in the fourth embodiment is improved. Before the low-expansion-coefficient material layer 2 is arranged between the optical fiber layers 1, the optical fiber layers 1 are formed by winding optical fibers soaked with glue.
After the low-expansion coefficient material layer 2 is arranged between the optical fiber layers 1, glue is soaked. The outer layer optical fiber layer 1 far away from the center of the optical fiber coil prevents glue infiltrated in the later period from entering the inner layer optical fiber layer 1 near the center of the optical fiber coil, so that the optical fiber layer 1 is not easy to be fully infiltrated in the glue 3.
Before the low-expansion-coefficient material layer 2 is arranged between the optical fiber layers 1, the optical fiber layers 1 are formed by winding optical fibers soaked with glue, so that glue is soaked at each position of the optical fibers before winding, the combination degree of the optical fibers and the glue is improved, each layer of optical fibers are fully in the environment of the glue 3, the glue 3 is uniformly filled, and in the later stage, the distribution of environmental factors on an optical fiber ring of the optical fiber gyroscope is uniform, so that the changes of the length (L) and the diameter (D) of the optical fibers in the optical fiber layers 1 are further reduced, and the stability of the scale factor of the optical fiber gyroscope is further improved.
Example six: the manufacturing method of the optical fiber coil in the fifth embodiment is improved. The method comprises the following steps of arranging a low-expansion-coefficient material layer 2 between optical fiber layers 1: a layer of low expansion coefficient material 2 is arranged between adjacent optical fiber layers 1.
In this way, deformation of the gel 3 between adjacent optical fibers is inhibited by the low expansion coefficient material layer 2, so that changes of the length (L) and the diameter (D) of the optical fibers in the optical fiber layer 1 are further reduced, and the stability of the scale factor of the fiber-optic gyroscope is further improved (as shown in fig. 2).
Example seven: the improvement is made on the basis of the manufacturing method of the optical fiber coil in the sixth embodiment. The low expansion coefficient material layer 2 is in the shape of a net with holes 4.
The low expansion coefficient material layer 2 can separate the optical fiber layer 1 from the colloid 3 by a part, and the reticular low expansion coefficient material layer 2 with the holes 4 is beneficial to the colloid 3 to pass through the holes 4, is beneficial to the optical fiber layer 1 to be fully immersed in the colloid 3, and improves the uniformity of the distribution of the environmental factors in the optical fiber coil. The reticular low-expansion-coefficient material layer 2 with the holes 4 is beneficial to the colloid 3 to pass through the holes 4, and can also prevent the optical fiber layer 1 layering on the two sides of the low-expansion-coefficient material layer 2, so that the optical fiber coil is prevented from loosening, and the stability of the optical fiber coil is improved.
Preferably, the thickness of the low expansion coefficient material layer 2 in the radial direction of the optical fiber coil is 0.05-0.20 of the diameter of the optical fiber, so that the low expansion coefficient material layer 2 with the thickness is enough to effectively inhibit the deformation of the colloid 3, effectively reducing the change of the length (L) and the diameter (D) of the optical fiber in the optical fiber layer 1, and meanwhile, the low expansion coefficient material layer 2 with the thickness does not occupy too much thickness in the radial direction of the optical fiber coil, so that the volume of the whole optical fiber coil is not excessively increased.
Preferably, the width of the low-expansion-coefficient material layer 2 in the axial direction of the optical fiber coil is consistent with the width of the optical fiber layer 1 in the axial direction of the optical fiber coil, so that the edge of the low-expansion-coefficient material layer 2 on the optical fiber layer 1 is smooth, the symmetry of the optical fiber coil is better, and the precision of the optical fiber gyroscope is higher.
Preferably, the plurality of pores 4 are uniformly distributed in the low expansion coefficient material layer 2. Like this, be favorable to optical fiber layer 1 evenly to be immersed in colloid 3, low coefficient of expansion material layer 2 evenly undertakes colloid 3 because of receiving the stress that external temperature arouses the time production, and fiber coil's symmetry is better, has further improved the homogeneity of environmental factor at fiber coil's distribution, and fiber optic gyroscope's precision is higher.
Preferably, the shape of the holes 4 is a regular hexagon. The colloid 3 has certain impact on the low expansion coefficient material layer 2 due to stress and deformation generated when being excited by external temperature, and the shape of the hole 4 is a regular hexagon, so that the low expansion coefficient material layer 2 has stronger capability of bearing the impact, and the low expansion coefficient material layer 2 has good structural stability (as shown in figure 3).
Example eight: the manufacturing method of the optical fiber coil according to the seventh embodiment is improved. The method comprises the following steps of arranging a layer of low-expansion-coefficient material layer 2 between every two adjacent optical fiber layers 1, and further comprises the following steps: the method comprises the following steps: winding the optical fiber around the ring winding tool 8 to form a first optical fiber layer 6; step two: the low-expansion-coefficient material 5 surrounds the surface of the first optical fiber layer 6 to form a first low-expansion-coefficient material layer; step three: winding the optical fiber on the surface of the first layer of low-expansion coefficient material layer, and forming a second layer of optical fiber layer on the surface of the first layer of low-expansion coefficient material layer; and continuing to surround the optical fiber layer 1 and the low-expansion-coefficient material layer 2 to the ring winding tool 8 in turn according to the method in the first step, the second step and the third step until the last layer of optical fiber is wound into the last layer of optical fiber layer to form the optical fiber coil (as shown in fig. 4).
And then, carrying out subsequent links such as curing, ultraviolet irradiation, high-low temperature box and the like on the optical fiber coil formed by the steps to further form a more stable optical fiber coil.
Example nine: an improvement is made on the basis of the manufacturing method of the optical fiber coil in the eighth embodiment. In the second step, the low expansion coefficient material 5 is a magnetic material, the magnetic adsorption device 7 is installed on the inner side of the winding tool 8, and the low expansion coefficient material 5 is adsorbed and wound on the surface of the first optical fiber layer 6 by the magnetic force of the magnetic adsorption device 7 to form a first low expansion coefficient material layer.
Thus, it is not necessary to add a sticky substance to the surface of the first optical fiber layer to stick the low expansion coefficient material 5 to the surface of the optical fiber layer 1. The low expansion coefficient material 5 is attracted and surrounded to the surface of the first optical fiber layer 6 by magnetic force, so that the performance of the optical fiber coil is not influenced by the additionally added adhesive substance, and the efficiency of surrounding the low expansion coefficient material 5 to the surface of the optical fiber layer 1 is improved.
Preferably, the direction of the magnetic force is along the radial direction of the encircling tool 8 and towards the center of the encircling tool 8.
Specifically, in the first step, in order to prevent the optical fiber of the second fiber supply wheel from being broken, before the optical fiber 9 on the first fiber supply wheel is wound around the winding tool 8 to form the first optical fiber layer 6, the second fiber supply wheel and the winding tool 8 are coaxially placed and coaxially rotate, the second fiber supply wheel and the winding tool 8 are relatively static, the first fiber supply wheel and the winding tool 8 are not coaxially placed, the first fiber supply wheel and the winding tool 8 simultaneously rotate at the same time, the linear speed is the same, the optical fiber 9 on the first fiber supply wheel is wound on the winding tool 8, after the optical fiber surrounds the winding tool 8 for one circle, the first fiber supply wheel and the winding tool 8 stop rotating, and the optical fiber is wound to form the first optical fiber layer 6; in the second step, in order to prevent the optical fiber of the second fiber supply wheel from being broken, the low-expansion-coefficient material 5 is laid in front of the surface of the first layer of optical fiber layer 6, the first fiber supply wheel and the second fiber supply wheel are placed coaxially with the winding tool 8, the first fiber supply wheel and the second fiber supply wheel are relatively static with the winding tool 8, the rotating wheel 11 of the low-expansion-coefficient material is placed coaxially with the winding tool 8, one end of the low-expansion-coefficient material 5 is placed on the surface of the first layer of optical fiber layer 6, the position of the low-expansion-coefficient material 5 is aligned, the axial width of the low-expansion-coefficient material 5 in the optical fiber coil is aligned with the axial width of the optical fiber layer 1 in the optical fiber coil, a switch of the magnetic adsorption device 7 is opened, the rotating wheel 11 of the low-expansion-coefficient material and the winding tool 8 rotate simultaneously, the linear speed is the same, the magnetic adsorption device 7 is installed on the inner side of the winding tool 8, the low-expansion-coefficient material 5 is adsorbed on the surface of the first layer of optical fiber layer 6 by the magnetic adsorption device 7, and the first layer of the low-expansion-coefficient material is formed. After the low expansion coefficient material 5 surrounds the winding tool 8 for one circle, the rotating wheel 11 of the low expansion coefficient material and the winding tool 8 stop rotating, the rotation is cut off at the joint position of the low expansion coefficient material 5, and the switch of the magnetic adsorption device 7 is closed. After the first layer of low-expansion-coefficient material layer is flatly covered on the surface of the first layer of optical fiber layer 6, whether the edge, the joint and the surface of the low-expansion-coefficient material 5 are placed flatly or not is observed, and fine adjustment is needed if the edge, the joint and the surface of the low-expansion-coefficient material are not flat. In the third step, in order to prevent the optical fiber of the first fiber supplying wheel from being broken, before the optical fiber 10 on the second fiber supplying wheel is wound around the winding tool 8 to form the second layer of optical fiber layer 1, the first fiber supplying wheel and the winding tool 8 are coaxially placed and coaxially rotate, the first fiber supplying wheel and the winding tool 8 are relatively static, the second fiber supplying wheel and the winding tool 8 are not coaxially placed, the second fiber supplying wheel and the winding tool 8 simultaneously rotate at the same linear velocity, the optical fiber 10 on the second fiber supplying wheel is wound on the winding tool 8, after the optical fiber surrounds the winding tool 8 for one circle, the second fiber supplying wheel and the winding tool 8 stop rotating, and the optical fiber is wound to form the second layer of optical fiber layer; and continuing to surround the optical fiber layer 1 and the low-expansion-coefficient material layer 2 to the ring winding tool 8 according to the method in the first step, the second step and the third step until the last layer of optical fiber is wound into the last layer of optical fiber layer to form the optical fiber coil.
And then, carrying out subsequent links such as curing, ultraviolet irradiation, high-low temperature box and the like on the optical fiber coil formed by the steps to further form a more stable optical fiber coil.
Preferably, the low expansion coefficient material 5 is a magnetic material such as an iron-nickel low expansion alloy or an iron-chromium low expansion alloy.
Example ten: a fiber-optic gyroscope comprising the fiber-optic coil manufactured by the method for manufacturing the fiber-optic coil according to any one of the fourth to ninth embodiments.
Experiment: the number of the optical fiber layers is 4, each layer has 8 turns, the colloid is epoxy resin polymer, the shape of the low expansion coefficient material layer is a mesh with holes, and the material is iron-nickel low expansion alloy. The diameter of the optical fiber is 165 μm, and the thickness of the low expansion coefficient material layer in the radial direction of the optical fiber coil is 10 μm, 20 μm and 30 μm, and the simulation comparison between the conventional optical fiber coil of the prior art and the optical fiber coil improved by the patent is carried out. Wherein the change in length (L) of the optical fibers in the fiber layers is represented by axial displacement and the change in diameter (D) is represented by radial displacement.
TABLE 1 comparison of simulation results
The axial displacement values in table 1 are the average axial displacement values for each turn of fiber, and the radial displacement values are the average radial displacement values for each turn of fiber. The axial displacement and the radial displacement of the optical fiber coil with the above three thicknesses of the improved optical fiber coil are respectively smaller than those of the traditional optical fiber coil. The thickness of the low expansion coefficient material layer in the radial direction of the optical fiber coil is 0.06, 0.12, 0.18 of the diameter of the optical fiber (the thickness of the low expansion coefficient material layer in the radial direction of the optical fiber coil described hereinbefore is in the range of 0.05-0.20 of the diameter of the optical fiber).
In order to avoid excessively increasing the volume of the whole optical fiber coil, limit on installation of the optical fiber coil in a limited space and difficulty in the process of winding the optical fiber, a low-expansion-coefficient material layer with the thickness of 10 mu m is preferably selected for carrying out specific displacement cloud chart simulation. After the optical fiber coil is manufactured, the axial displacement and the radial displacement of an optical fiber layer in the optical fiber coil are simulated, the axial displacement and the radial displacement of the optical fiber coil of the improved optical fiber coil (the diameter of an optical fiber is 165 mu m, and the thickness of a low-expansion coefficient material layer in the radial direction of the optical fiber coil is 10 mu m) are smaller than those of the conventional optical fiber coil, and therefore the deformation of the length (L) and the diameter (D) of the optical fiber layer in the improved optical fiber coil is effectively improved, the scale factor is obviously improved, the stability of the optical fiber gyroscope is improved, and particularly the long-term stability is improved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The optical fiber coil is characterized by comprising an optical fiber layer (1), a colloid (3) and a low-expansion-coefficient material layer (2); the optical fiber coil is characterized in that the colloid (3) is filled between optical fibers of the optical fiber layer (1), the optical fiber layer (1) and the low-expansion-coefficient material layer (2) are arranged in the radial direction of the optical fiber coil at intervals, and the linear expansion coefficient of the low-expansion-coefficient material layer (2) is smaller than that of the colloid (3).
2. The fiber optic coil of claim 1, wherein a layer of the low coefficient of expansion material (2) is disposed between adjacent fiber optic layers (1).
3. The fiber optic coil according to claim 1, wherein the low expansion coefficient material layer (2) is in the shape of a mesh with holes (4), and a plurality of the holes (4) are uniformly distributed in the low expansion coefficient material layer (2).
4. The manufacturing method of the optical fiber coil is characterized in that low-expansion-coefficient material layers (2) are arranged between optical fiber layers (1), the optical fiber layers (1) and the low-expansion-coefficient material layers (2) are arranged at intervals in the radial direction of the optical fiber coil, colloid (3) is filled between optical fibers of the optical fiber layers (1), and the coefficient of linear expansion of the low-expansion-coefficient material layers (2) is smaller than that of the colloid (3).
5. A method for manufacturing an optical fiber coil according to claim 4, wherein the optical fiber layer (1) is wound from an optical fiber impregnated with glue before the low expansion coefficient material layer (2) is disposed between the optical fiber layers (1).
6. A method for manufacturing a fiber coil according to claim 5, wherein the step of arranging the low expansion coefficient material layer (2) between the fiber layers (1) further comprises the steps of: and a layer of low-expansion coefficient material layer (2) is arranged between every two adjacent optical fiber layers (1).
7. A method for manufacturing a fiber coil according to claim 6, wherein the low expansion coefficient material layer (2) is in the shape of a mesh with holes (4).
8. A method for manufacturing a fiber coil according to claim 7, wherein a layer of the low expansion coefficient material (2) is disposed between adjacent fiber layers (1), and further comprising the steps of: the method comprises the following steps: winding the optical fiber (9) on the first fiber supply wheel into a first layer of optical fiber layer (6) around the winding tool (8); step two: the low expansion coefficient material (5) is wound on the surface of the first layer of optical fiber (6) to form a first layer of low expansion coefficient material; step three: winding an optical fiber (10) on a second fiber supply wheel on the surface of the first layer of low-expansion-coefficient material layer, and forming a second layer of optical fiber layer on the surface of the first layer of low-expansion-coefficient material layer; and continuously surrounding the optical fiber layer (1) and the low-expansion coefficient material layer (2) to a ring winding tool (8) in turn according to the method in the first step, the second step and the third step until the last layer of optical fiber is wound into the last layer of optical fiber layer to form the optical fiber coil.
9. The manufacturing method of the optical fiber coil according to claim 8, wherein in the second step, the low expansion coefficient material (5) is a magnetic material, a magnetic adsorption device (7) is installed inside the winding tool (8), and the low expansion coefficient material (5) is adsorbed and wound on the surface of the first optical fiber layer (6) by the magnetic force of the magnetic adsorption device (7) to form a first low expansion coefficient material layer.
10. A fiber optic gyroscope comprising a fiber optic coil made by the method of making a fiber optic coil of any of claims 4-9.
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| CN116045955A (en) * | 2023-03-31 | 2023-05-02 | 中国船舶集团有限公司第七〇七研究所 | Optical fiber ring and optical fiber gyro for reducing temperature rise expansion stress based on intermediate layer |
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