CN116026312A - Optical fiber ring with soaking magnetic shielding function - Google Patents
Optical fiber ring with soaking magnetic shielding function Download PDFInfo
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- CN116026312A CN116026312A CN202310331885.2A CN202310331885A CN116026312A CN 116026312 A CN116026312 A CN 116026312A CN 202310331885 A CN202310331885 A CN 202310331885A CN 116026312 A CN116026312 A CN 116026312A
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Abstract
The invention relates to the technical field of fiber-optic gyroscopes, in particular to a fiber-optic ring with a soaking magnetic shielding function, which comprises a ring body, wherein the outer side surface and two bottom surfaces of the ring body are covered with a rubber bottom layer for increasing surface adhesion, the surface of the rubber bottom layer is covered with a bottom shielding layer, the outer side surface of the bottom shielding layer is provided with a reticular shielding layer, the reticular shielding layer comprises cross beams and longitudinal beams which are distributed in a staggered way, and the bottom shielding layer and the reticular shielding layer both contain iron-based magnetic conductive powder. The invention has simple structure, and the bottom shielding layer and the reticular shielding layer have good electromagnetic shielding performance; the net-shaped shielding layer can further reduce the influence of electromagnetic waves on the ring body; the iron-based magnetic conductive powder can also improve the heat conductivity coefficients of the bottom shielding layer and the net shielding layer, and is beneficial to improving the error of the optical fiber ring shupe; because the shielding box is not required to be sleeved, the consumption of corresponding metal can be greatly reduced, and the shielding box has the advantages of size and weight.
Description
Technical Field
The invention relates to the technical field of fiber-optic gyroscopes, in particular to a fiber-optic ring with a soaking magnetic shielding function.
Background
The optical fiber gyro belongs to a solid-state gyro, and the precision range is wide, wherein the low-precision optical fiber gyro with the precision of 0.1 degree per hour is in great demand. Limited to the market price and the use scene of the low-precision fiber-optic gyroscope, the size, the weight and the cost of the low-precision fiber-optic gyroscope need to be strictly controlled, so that a simple and effective electromagnetic shielding structure is one of the development directions of the low-precision fiber-optic gyroscope.
The traditional electromagnetic shielding structure mostly forms a shielding box by machining or metal plate welding metal materials, more metal materials are needed to be consumed, the material cost is high, and the machining cost is high.
Disclosure of Invention
The present invention is directed to solving at least one of the technical problems existing in the related art. Therefore, the invention provides the optical fiber ring with the function of soaking magnetic shielding.
The invention is realized by the following technical scheme: the utility model provides an optic fibre ring with soaking magnetic shielding function, includes the ring body, the lateral surface and the two bottom surfaces of ring body all cover and are used for increasing the gluey bottom of surface adhesion, glue the bottom surface and cover there is a shielding layer, the lateral surface of shielding layer is equipped with netted shielding layer, netted shielding layer is including crisscross crossbeam and the longeron that distributes, shielding layer and netted shielding layer are by shielding coating spray coating and form, shielding coating is mixed by ultraviolet light curing coating and iron-based magnetic conduction powder and forms, iron-based magnetic conduction powder and ultraviolet light curing coating's weight ratio is greater than 5.5:1.
Preferably, the longitudinal direction of the longitudinal beam is parallel to the axis of the ring body, the cross beam is annular, the axis of the cross beam is coaxial with the axis of the ring body, the cross beam and the longitudinal beam are all provided with a plurality of cross beams which are distributed at equal intervals, the longitudinal beams are distributed around the axis of the ring body at equal angles, and the width of the cross beam is the same as that of the longitudinal beam.
Preferably, the adhesive bottom layer is formed by rotationally curing an ultraviolet curing adhesive under ultraviolet rays.
Preferably, the iron-based magnetic conductive powder is permalloy powder, and the particle size of the permalloy powder is 5nm-8nm.
Preferably, the iron-based magnetic conductive powder in the shielding coating is permalloy powder subjected to vacuum annealing treatment at 600 ℃.
Preferably, the permalloy powder is subjected to a vacuum annealing treatment at 600 ℃ as follows: uniformly placing permalloy powder on the surface of a ceramic tool in a vacuum furnace with residual pressure not more than 0.1Pa, heating to 1150+/-10 ℃ along with the vacuum furnace, preserving heat for 3-6 h, cooling to 600 ℃ at the speed of 100 ℃/h-150 ℃/h, cooling to below 200 ℃ at the speed of not less than 400 ℃/h, discharging, and cooling to normal temperature.
Preferably, the weight ratio of permalloy powder to ultraviolet light curing coating in the shielding coating is 5.5:1 to 7:1.
Preferably, the weight ratio of permalloy powder to ultraviolet light curing coating in the shielding coating is 6.5:1.
Preferably, the thickness of the bottom shielding layer is 100 μm, and the thickness of the mesh shielding layer is 300 μm.
The above technical solutions in the embodiments of the present invention have at least one of the following technical effects:
the invention has simple structure, and the bottom shielding layer and the reticular shielding layer have good electromagnetic shielding performance; the net-shaped shielding layer can further reduce the influence of electromagnetic waves on the ring body, so that the electromagnetic shielding performance of the whole optical fiber ring is improved; the reticular shielding layer also increases the surface area of the outer side of the optical fiber ring, and has good heat dissipation effect; the iron-based magnetic conductive powder can also improve the heat conductivity coefficients of the bottom shielding layer and the reticular shielding layer, plays a good heat equalizing role, is beneficial to improving the fiber ring hupe error and can relatively improve the sensitivity precision of the fiber ring; because the shielding box is not required to be sleeved, the consumption of corresponding metal can be greatly reduced, so that the material cost and the processing cost can be reduced, and the optical fiber gyroscope has the size advantage and the weight advantage compared with the optical fiber gyroscope with the shielding box with the same precision; the adhesive bottom layer, the bottom shielding layer and the net shielding layer also play a role in protecting the ring body, and the ring body can be prevented from being damaged in the debugging process of the optical fiber ring; the permalloy powder subjected to vacuum annealing treatment can further improve the electromagnetic shielding performance of the bottom shielding layer and the net shielding layer on the ring body; by limiting the weight ratio of permalloy powder to the ultraviolet light curing coating in the shielding coating, better shielding effectiveness can be obtained.
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
FIG. 1 is a schematic view of a fiber optic ferrule with thermal soaking magnetic shielding according to the present invention.
Fig. 2 is a schematic diagram of an internal structure of an optical fiber loop with a soaking magnetic shielding function according to the present invention.
In the figure: 1. a bottom shielding layer; 2. a mesh-shaped shielding layer; 201. a cross beam; 202. a longitudinal beam; 3. a glue bottom layer; 4. a ring body.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The following examples are illustrative of 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 "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific 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 describing embodiments of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in embodiments of the present invention will be understood in detail by those of ordinary skill in the art.
In embodiments of the invention, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
As shown in fig. 1 and fig. 2, the optical fiber loop with the soaking magnetic shielding function provided by the invention comprises a loop body 4, wherein the outer side surface and two bottom surfaces of the loop body 4 are covered with a rubber bottom layer 3 for increasing surface adhesion, the two bottom surfaces of the loop body 4 are two end surfaces of the loop body perpendicular to the axis of the loop body, the outer side surface of the loop body 4 is a cylindrical surface with larger diameter of the loop body 4, the surface of the rubber bottom layer 3 is covered with a bottom shielding layer 1, the adhesive stability of the bottom shielding layer 1 can be improved by arranging the rubber bottom layer 3, the outer side surface of the bottom shielding layer 1 is provided with a net-shaped shielding layer 2, the outer side surface of the bottom shielding layer 1 is a cylindrical surface with larger diameter of the bottom shielding layer 1, the net-shaped shielding layer 2 comprises a cross beam 201 and a longitudinal beam 202 which are distributed in a staggered manner, the bottom shielding layer 1 and the net-shaped shielding layer 2 are formed by spraying shielding coatings, the shielding coatings are mixed with iron-based powder, so that the shielding coatings can be adhered to the outer side of the bottom shielding layer 3 in a manner, and the ultraviolet shielding coatings can be sprayed and irradiated at the same time, and the ultraviolet shielding magnetic shielding coatings can be cured for a short time.
The weight ratio of the iron-based magnetic conductive powder to the ultraviolet curing coating is greater than 5.5:1, the iron-based magnetic conductive powder can form a complete crossed three-dimensional magnetic conductive network in the three-dimensional space of the bottom shielding layer 1 and the net shielding layer, when electromagnetic waves of the external environment propagate to the surface of the optical fiber ring, a part of the electromagnetic waves can be reflected by the bottom shielding layer 1 and the net shielding layer 2 to the direction far away from the ring body 4, a part of the electromagnetic waves can propagate along the bottom shielding layer 1 and the net shielding layer 2, a part of the electromagnetic waves can be reflected and attenuated between the whole inner side surfaces and the whole outer side surfaces of the bottom shielding layer 1 and the net shielding layer 2 for multiple times, and only a very small part of the electromagnetic waves can penetrate through the bottom shielding layer 1 and the net shielding layer 2 and affect the ring body 4. Therefore, the bottom shielding layer 1 and the mesh shielding layer 2 containing the iron-based magnetically conductive powder have good electromagnetic shielding performance.
Because the cross beam 201 and the longitudinal beam 202 of the mesh-shaped shielding layer 2 containing the iron-based magnetic conductive powder form good electromagnetic channels, the parts of the electromagnetic waves propagating along the bottom shielding layer 1 and the mesh-shaped shielding layer 2 are basically concentrated at the positions of the cross beam 201 and the longitudinal beam 202, and the mesh-shaped shielding layer 2 is positioned far away from the ring body 4 relative to the bottom shielding layer 1 and the adhesive bottom layer 3, so that the influence of the electromagnetic waves on the ring body 4 can be further reduced, and the electromagnetic shielding performance of the whole optical fiber ring is improved.
The reticular shielding layer 2 also increases the surface area of the outer side of the optical fiber ring, and has good heat dissipation effect; the iron-based magnetic conductive powder can also improve the heat conductivity coefficients of the bottom shielding layer 1 and the net shielding layer 2, plays a good heat equalizing role, is beneficial to improving the shupe error of the optical fiber ring, and can relatively improve the sensitivity precision of the optical fiber ring.
After the bottom shielding layer 1 and the net-shaped shielding layer 2 are doped with the iron-based magnetic conductive powder, the shielding boxes are not required to be sleeved, so that the consumption of corresponding metals can be greatly reduced, the material cost and the processing cost can be reduced, and the size advantage and the weight advantage are realized relative to the optical fiber gyroscope with the shielding boxes with the same precision. The adhesive bottom layer 3, the bottom shielding layer 1 and the net shielding layer 2 also play a role in protecting the ring body 4, and the ring body 4 can be prevented from being damaged in the debugging process of the optical fiber ring.
The length direction of the longitudinal beam 202 is parallel to the axis of the ring body 4, the cross beam 201 is annular, the axis of the cross beam 201 is coaxial with the axis of the ring body 4, the cross beam 201 and the longitudinal beam 202 are provided with a plurality of cross beams 201 which are distributed equidistantly, the longitudinal beams 202 are distributed at equal angles around the axis of the ring body 4, and the width of the cross beam 201 is the same as that of the longitudinal beam 202, so that the part of the electromagnetic wave propagating along the netlike shielding layer 2 can be distributed relatively uniformly on the periphery of the ring body 4.
The adhesive bottom layer 3 is formed by rotationally curing an ultraviolet curing adhesive under ultraviolet rays, and specifically, the adhesive bottom layer 3 can be obtained through the following steps: after the ring body 4 is wound, the middle hole of the ring body 4 is plugged, then the ring body 4 is completely immersed in ultraviolet curing adhesive, the ring body 4 is taken out after 2min, and the ring body 4 is rotated and cured for 20min under ultraviolet rays to form the adhesive bottom layer 3. The cured adhesive bottom layer 3 has the characteristics of good binding force with ultraviolet curing paint, high hardness and difficult damage, and can play a good role in protecting the ring body 4.
The iron-based magnetic conductive powder is permalloy powder, specifically, 1J85 permalloy spherical powder can be selected, and has good electromagnetic shielding performance, the particle size of the permalloy powder is 5-8 nm, adverse effects on the fluidity of the shielding coating due to overlarge particle size of the permalloy powder can be avoided, and in addition, ferrite, pure iron, silicon steel and other materials can be selected as the iron-based magnetic conductive powder.
The iron-based magnetic conductive powder in the shielding coating is permalloy powder subjected to vacuum annealing treatment at 600 ℃, and specifically, the annealing process of the permalloy powder is as follows: uniformly placing permalloy powder on the surface of a ceramic tool in a vacuum furnace with residual pressure not more than 0.1Pa, heating to 1150+/-10 ℃ along with the vacuum furnace, preserving heat for 3-6 h, cooling to 600 ℃ at the speed of 100 ℃/h-150 ℃/h, cooling to below 200 ℃ at the speed of not less than 400 ℃/h, discharging, and cooling to normal temperature. The permeability of permalloy powder can be improved through vacuum annealing treatment, and the electromagnetic shielding performance of the bottom shielding layer 1 and the net shielding layer 2 to the ring body 4 is further improved.
In theory, the shielding effectiveness of the bottom shielding layer 1 and the mesh shielding layer 2 is positively correlated with the content of the iron-based magnetically conductive powder in the shielding paint, however, it is found through research that when the content of the iron-based magnetically conductive powder in the shielding paint is greater than a certain critical value, the improvement of the shielding effectiveness of the bottom shielding layer 1 and the mesh shielding layer 2 is not obvious, and the content of the iron-based magnetically conductive powder is too much, the fluidity of the shielding paint is also reduced, possibly resulting in uneven spraying, and also causing adverse effects on the magnetic shielding effectiveness of the bottom shielding layer 1 and the mesh shielding layer 2.
When the iron-based magnetic conductive powder is 1J85 permalloy spherical powder with the grain diameter of 5nm-8nm, the thickness of the adhesive bottom layer 3 is 100 mu m, the thickness of the bottom shielding layer 1 is 100 mu m, the thickness of the net shielding layer 2 is 300 mu m, the widths of the longitudinal beams 202 and the transverse beams 201 are 1mm, the distance between the adjacent longitudinal beams 202 and the distance between the adjacent transverse beams 201 are 4mm, and the shielding effectiveness of the permalloy powder and the ultraviolet curing coating obtained by experiments under different weight proportions in the shielding coating is shown in table 1:
table 1: shielding effectiveness of permalloy powder and ultraviolet light solidified coating in different weight proportion
It can be seen that the shielding effect is higher when the weight ratio of permalloy powder to ultraviolet light curing coating in the shielding coating is between 5.5:1 and 7:1; the shielding effectiveness is optimal when the weight ratio of permalloy powder to uv-curable coating in the shielding coating is 6.5:1.
The thickness of the bottom shielding layer 1 is 100 μm, the thickness of the mesh shielding layer 2 is 300 μm, and theoretically, the shielding effectiveness of the bottom shielding layer 1 and the mesh shielding layer 2 are positively related to the thickness thereof, however, it has been found that when the thicknesses of the bottom shielding layer 1 and the mesh shielding layer 2 are too large, the bonding force of the shielding paint is deteriorated and the material cost is correspondingly increased, and thus, the shielding effectiveness and the cost can be both considered by controlling the thicknesses of the bottom shielding layer 1 and the mesh shielding layer 2 at the corresponding values.
The working principle of the optical fiber ring with the soaking magnetic shielding function is that the iron-based magnetic conductive powder forms a complete crossed three-dimensional magnetic conductive network in the three-dimensional space of the bottom shielding layer and the net shielding layer, when electromagnetic waves of the external environment propagate to the surface of the optical fiber ring, one part of the electromagnetic waves can be reflected by the bottom shielding layer and the net shielding layer to the direction far away from the ring body, the other part of the electromagnetic waves can propagate along the bottom shielding layer and the net shielding layer, one part of the electromagnetic waves can reflect and attenuate between the whole inner side surfaces and the whole outer side surfaces of the bottom shielding layer and the net shielding layer for multiple times, and only a few parts of the electromagnetic waves can penetrate through the bottom shielding layer and the net shielding layer and affect the ring body. The invention has simple structure, and the adhesive stability of the bottom shielding layer can be improved by arranging the adhesive bottom layer; the bottom shielding layer and the net shielding layer have good electromagnetic shielding performance; the net-shaped shielding layer can further reduce the influence of electromagnetic waves on the ring body, so that the electromagnetic shielding performance of the whole optical fiber ring is improved; the reticular shielding layer also increases the surface area of the outer side of the optical fiber ring, and has good heat dissipation effect; the iron-based magnetic conductive powder can also improve the heat conductivity coefficients of the bottom shielding layer and the reticular shielding layer, plays a good heat equalizing role, is beneficial to improving the fiber ring hupe error and can relatively improve the sensitivity precision of the fiber ring; because the shielding box is not required to be sleeved, the consumption of corresponding metal can be greatly reduced, so that the material cost and the processing cost can be reduced, and the optical fiber gyroscope has the size advantage and the weight advantage compared with the optical fiber gyroscope with the shielding box with the same precision; the adhesive bottom layer, the bottom shielding layer and the net shielding layer also play a role in protecting the ring body, and the ring body can be prevented from being damaged in the debugging process of the optical fiber ring; the permalloy powder subjected to vacuum annealing treatment can further improve the electromagnetic shielding performance of the bottom shielding layer and the net shielding layer on the ring body; by limiting the weight ratio of permalloy powder to the ultraviolet light curing coating in the shielding coating, better shielding effectiveness can be obtained.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The utility model provides an optic fibre ring with soaking magnetic shielding function, includes the ring body, its characterized in that, the lateral surface and the two bottom surfaces of ring body all cover and are used for increasing the gluey bottom of surface adhesion, glue the bottom surface and cover there is a shielding layer, the lateral surface of shielding layer is equipped with netted shielding layer, netted shielding layer is including crisscross crossbeam and the longeron that distributes, shielding layer and netted shielding layer are by shielding coating spray coating, shielding coating is mixed by ultraviolet curing coating and iron-based magnetic conduction powder and forms, iron-based magnetic conduction powder and ultraviolet curing coating's weight ratio is greater than 5.5:1.
2. The optical fiber ring with the soaking magnetic shielding function according to claim 1, wherein the longitudinal direction of the longitudinal beam is parallel to the axis of the ring body, the cross beam is annular, the axis of the cross beam is coaxial with the axis of the ring body, the cross beam and the longitudinal beam are provided with a plurality of cross beams which are equidistantly distributed, the longitudinal beams are equiangularly distributed around the axis of the ring body, and the width of the cross beam is the same as that of the longitudinal beam.
3. The optical fiber ring with the soaking magnetic shielding function according to claim 1, wherein the adhesive bottom layer is formed by rotationally curing an ultraviolet curing adhesive under ultraviolet rays.
4. An optical fiber loop with soaking magnetic shielding function according to claim 1, wherein the iron-based magnetic conductive powder is permalloy powder, and the particle size of the permalloy powder is 5nm-8nm.
5. The optical fiber loop with soaking magnetic shielding function according to claim 1, wherein the iron-based magnetic conductive powder in the shielding coating is permalloy powder subjected to vacuum annealing at 600 ℃.
6. The optical fiber loop with soaking magnetic shielding function according to claim 5, wherein the step of vacuum annealing the permalloy powder at 600 ℃ is as follows: uniformly placing permalloy powder on the surface of a ceramic tool in a vacuum furnace with residual pressure not more than 0.1Pa, heating to 1150+/-10 ℃ along with the vacuum furnace, preserving heat for 3-6 h, cooling to 600 ℃ at the speed of 100 ℃/h-150 ℃/h, cooling to below 200 ℃ at the speed of not less than 400 ℃/h, discharging, and cooling to normal temperature.
7. An optical fiber loop with soaking magnetic shielding function according to any one of claims 4 to 6, wherein the weight ratio of permalloy powder to uv curable coating in the shielding coating is 5.5:1 to 7:1.
8. The optical fiber loop with soaking magnetic shielding function according to claim 7, wherein the weight ratio of permalloy powder to ultraviolet light curing coating in the shielding coating is 6.5:1.
9. The optical fiber loop with soaking magnetic shielding function according to claim 1, wherein the thickness of the bottom shielding layer is 100 μm and the thickness of the mesh shielding layer is 300 μm.
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