Optical fiber loop module with high magnetic shielding performance and manufacturing method thereof

Abstract

The application relates to an optical fiber ring module with high magnetic shielding performance and a manufacturing method thereof, and solves the technical problem that the prior art has limited magnetic shielding performance. The application comprises a base, a shielding framework sleeved on the base, and a shielding bottom cover; the shielding framework is internally provided with an optical fiber ring; the base is provided with a Y waveguide, a coupler, and a temperature sensor; an upper first-layer shielding cover and a lower first-layer shielding cover are arranged on the outer layer to realize first-layer full magnetic shielding; an upper second-layer shielding cover, a second-layer shielding cylinder, and a lower second-layer shielding cover are correspondingly connected to realize second-layer full magnetic shielding; and an upper third-layer shielding cover, a third-layer shielding cover, and a third-layer shielding sleeve are correspondingly connected to realize third-layer full magnetic shielding. The magnetic shielding layers of the first layer and the third layer are made of magnetic conductive materials to shield the interference of low-frequency magnetic fields, the magnetic shielding layer of the second layer in the middle is made of conductive materials to shield the interference of high-frequency magnetic fields, and the three-layer full magnetic shielding coating improves the magnetic shielding performance.

Description

TECHNICAL FIELD

[0001] The present application relates to fiber optic gyroscope, and in particular to a fiber ring module with high magnetic shielding performance and a manufacturing method thereof. BACKGROUND

[0002] The fiber optic gyroscope is a kind of all-solid-state inertial measurement instrument based on Sagnac effect, which has the advantages of impact resistance, high sensitivity, long service life, large dynamic range, short start-up time, etc., and is widely used in aerospace, aviation, navigation and other fields. With the development of technology, the application scenarios of fiber optic gyroscope are constantly changing, and the external magnetic field environment it faces is becoming more and more complex. As the core component of fiber optic gyroscope, the stable operation of fiber ring module is the main factor determining the precision of fiber optic gyroscope.

[0003] The fiber ring module is easily disturbed by external magnetic field and generates magnetic non-reciprocal phase difference, which reduces the measurement accuracy of fiber optic gyroscope, thereby affecting the accuracy of navigation and positioning. In addition, the external magnetic field environment is gradually complex, which further restricts the engineering application of high-precision fiber optic gyroscope.

[0004] The existing magnetic shielding scheme of fiber ring module is mainly aimed at the magnetic shielding of fiber ring. For example, the double-layer magnetic protection ring device for high-precision fiber optic gyroscope disclosed in Chinese patent CN102620728A has the following problems: the fiber ring is double-layer magnetically shielded, but the Y waveguide and the Y waveguide and fiber ring coiled tail fiber are only single-layer magnetically shielded; the magnetic shielding of the leakage hole position and the inner layer matching installation position is not considered, and there is a lot of magnetic leakage; high-frequency magnetic shielding is not considered. The fiber optic gyroscope based on single-layer magnetic shielding and double-layer thermal insulation and the assembly method disclosed in Chinese patent CN110672085B and the fiber optic gyroscope with double-layer magnetic shielding structure disclosed in Chinese patent CN112880658A have similar problems.

[0005] The existing magnetic shielding scheme only considers low-frequency magnetic shielding, and lacks effective magnetic shielding measures at the positions of Y waveguide, coupler and fiber tail, and the magnetic shielding of leakage holes such as fiber outlet hole, wire passing hole and external installation interface is also difficult to achieve. The above reasons lead to limited magnetic shielding performance of the fiber ring module, so it cannot meet the increasing magnetic shielding performance requirements of fiber optic gyroscope.

[0006] PATENT CONTENT

[0007] The present application aims to solve the technical problem of limited magnetic shielding performance in the prior art, and provides a fiber ring module with high magnetic shielding performance and a manufacturing method thereof.

[0008] In order to achieve the above-mentioned purpose, the technical solution provided by the present application is as follows:

[0009] The application discloses a fiber loop module with high magnetic shielding performance, which comprises a base, a shielding framework sleeved on the base, and a shielding bottom cover.

[0010] A mounting ring groove is formed in the lower end of the shielding framework, and a fiber loop is arranged in the mounting ring groove; the shielding bottom cover is arranged on the groove opening of the mounting ring groove and is used for cooperating with the mounting ring groove to perform basic magnetic shielding on the fiber loop; a Y waveguide, a coupler and a temperature sensor are arranged on the base; two tail fibers of the fiber loop are connected with two tail fibers at one end of the Y waveguide respectively, and one tail fiber at the other end of the Y waveguide is connected with a tail fiber of the coupler;

[0011] Definition: the direction in which the mounting ring groove faces is downward;

[0012] A supporting ring groove is formed in the upper end of the shielding framework; a supporting ring table is arranged on the lower surface of the shielding bottom cover; a first layer of upper shielding covers are embedded in the supporting ring groove; a first layer of lower shielding covers are sleeved on the supporting ring table; the first layer of upper shielding covers and the first layer of lower shielding covers are used for realizing first layer full magnetic shielding;

[0013] Second layer upper shielding covers are arranged on the upper surfaces of the shielding framework and the first layer of upper shielding covers; second layer shielding barrels are sleeved on the outer circumferential surfaces of the shielding framework and the first layer of lower shielding covers; second layer lower shielding covers are arranged on the lower surfaces of the first layer of lower shielding covers; the second layer upper shielding covers, the second layer shielding barrels and the second layer lower shielding covers are correspondingly connected and used for realizing second layer full magnetic shielding;

[0014] Third layer shielding covers with open lower ends are sleeved on the second layer upper shielding covers and the second layer shielding barrels; third layer shielding covers are arranged at the lower ends of the third layer shielding covers; at least three external mounting bosses are arranged on the lower surface of the base; first external transition holes are formed in the corresponding positions of the first layer of lower shielding covers; second external transition holes are formed in the corresponding positions of the third layer shielding covers; the external mounting bosses respectively pass through the first external transition holes, the second layer lower shielding covers and the second external transition holes; third layer shielding sleeves are arranged at the lower ends of the external mounting bosses; the third layer shielding covers, the third layer shielding covers and the third layer shielding sleeves are correspondingly connected and used for realizing third layer full magnetic shielding;

[0015] First wire passing holes and first fiber outlet holes are arranged on the first layer of lower shielding covers; second wire passing holes and second fiber outlet holes are arranged on the third layer shielding covers, and are respectively used for leading out the wires of the temperature sensor and the tail fibers of the Y waveguide and the coupler;

[0016] The first layer of upper shielding covers, the first layer of lower shielding covers, the third layer shielding covers, the third layer shielding covers and the third layer shielding sleeves are made of magnetic conductive materials and are used for shielding low-frequency magnetic field interference; the second layer upper shielding covers, the second layer shielding barrels and the second layer lower shielding covers are made of electrically conductive materials and are used for shielding high-frequency magnetic field interference.

[0017] Further, the upper surface outer edge of the first layer lower shielding cover is provided with a support ring plate, the direction of the support ring plate is upward and sleeved on the support ring table;

[0018] The upper surface of the first layer lower shielding cover is provided with a plurality of first external transition bosses corresponding to the first external transition holes respectively, the direction of the first external transition boss is upward and sleeved on the external mounting boss correspondingly;

[0019] The lower surface of the third layer shielding cover is provided with a plurality of second external transition bosses corresponding to the second external transition holes respectively, the direction of the second external transition boss is downward and sleeved on the external mounting boss correspondingly, and the lower end of the second external transition boss is connected with the corresponding third layer shielding sleeve;

[0020] The radial space between the first layer lower shielding cover and the lower surface of the shielding bottom cover and between the support ring table and the first external transition boss constitutes a fiber coiling area A, and the fiber coiling area A is used for coiling the fiber ring, Y waveguide and tail fiber of the coupler.

[0021] Further, the external mounting boss is provided with an external mounting counterbore, the inner end of the third layer shielding sleeve is embedded in the external mounting counterbore, and the outer end edge is connected with the second external transition boss of the third layer shielding cover;

[0022] The lower end of the base is provided with at least three first layer lower mounting holes and at least three third layer lower mounting holes, the first layer lower shielding cover is correspondingly provided with a first layer mounting hole and a third layer transition hole, the third layer shielding cover is provided with a third layer mounting hole at the position corresponding to the third layer lower mounting hole, and is respectively used for corresponding mounting of the first layer lower shielding cover and the third layer shielding cover;

[0023] The upper end of the base is further provided with at least three first layer upper mounting holes and at least three third layer upper mounting holes, the first layer upper shielding cover is provided with a mounting hole and a transition hole at the positions corresponding to the first layer upper mounting hole and the third layer upper mounting hole respectively, and the third layer shielding cover is provided with a mounting hole corresponding to the third layer upper mounting hole, and is respectively used for corresponding mounting of the first layer upper shielding cover and the third layer shielding cover.

[0024] Further, the lower surface of the base is provided with a plurality of first layer lower mounting bosses corresponding to the first layer lower mounting holes respectively and a plurality of third layer lower mounting bosses corresponding to the third layer lower mounting holes respectively; the upper surface of the first layer lower shielding cover is provided with a plurality of third layer lower transition bosses sleeved on the third layer lower mounting bosses correspondingly;

[0025] The upper surface of the base is provided with an annular lifting boss, and the first layer upper mounting hole and the third layer upper mounting hole are arranged on the annular lifting boss; a plurality of third layer upper mounting bosses corresponding to the third layer upper mounting holes are arranged on the annular lifting boss;

[0026] The third layer lower transition boss is used for reducing the range of magnetic leakage;

[0027] The first layer lower shielding cover is installed on the first layer lower mounting boss by a magnetic screw; and the third layer shielding cover is installed on the third layer lower mounting boss by a magnetic screw.

[0028] The first layer upper shielding cover is installed in the first layer upper mounting hole on the annular lifting boss by a magnetic screw; and the third layer shielding cover is installed on the third layer upper mounting boss by a magnetic screw.

[0029] Further, the first layer lower mounting hole and the third layer lower mounting hole are located on the same circumference and are staggered; and the first layer upper mounting hole and the third layer upper mounting hole are located on the same circumference and are staggered.

[0030] Further, the center line of the first wire passing hole and the first fiber outlet hole is recorded as a first layer center line, and the center line of the second wire passing hole and the second fiber outlet hole is recorded as a third layer center line; the projection of the first layer center line and the third layer center line in the radial plane is arranged in a cross manner.

[0031] Further, the upper surface of the first layer lower shielding cover is provided with a wire passing boss and a fiber outlet boss corresponding to the first wire passing hole and the first fiber outlet hole respectively; and the wire passing boss and the fiber outlet boss are used to reduce the range of magnetic leakage.

[0032] Further, the projection of the first layer center line and the third layer center line in the radial plane is perpendicular.

[0033] Further, the lower surface of the base is provided with a fiber outlet groove at the center position, and a Y waveguide mounting groove and a coupler mounting groove are arranged at positions on both sides of the fiber outlet groove;

[0034] The fiber outlet groove is used to lead out the tail fiber of the fiber ring; and the Y waveguide and the coupler are mounted on the base through the Y waveguide mounting groove and the coupler mounting groove;

[0035] The upper surface of the base is provided with a temperature sensor mounting groove at the center position, and a skeleton mounting hole is arranged on the upper surface of the base near the outer edge in a circumferential direction;

[0036] The temperature sensor is mounted on the base through the temperature sensor mounting groove; and a temperature sensor wire passing hole is arranged in the Y waveguide mounting groove, which is used to lead out the wire of the temperature sensor;

[0037] The inner side wall of the shielding skeleton is provided with a mounting ring plate matched with the position of the skeleton mounting hole, which is used to mount the shielding skeleton on the base;

[0038] The fiber ring is glued and fixed in the mounting ring groove, and the gap between the shielding bottom cover and the mounting ring groove is fixed by laser welding; and the third layer shielding cover and the third layer shielding cover are fixed by laser welding.

[0039] The application further provides a manufacturing method of the optical fiber loop module with high magnetic shielding performance.

[0040] S0, preparing the optical fiber loop, Y waveguide, coupler and temperature sensor; preparing the shielding skeleton, shielding bottom cover, base, first layer upper shielding cover, first layer lower shielding cover, second layer upper shielding cover, second layer shielding cylinder, second layer lower shielding cover, third layer shielding cover and third layer shielding sleeve;

[0041] S1, fixing the third layer shielding sleeve on the base;

[0042] S2, fixing the optical fiber loop in the mounting ring groove of the shielding skeleton; leading the tail fibers of the optical fiber loop out of the mounting ring groove and fixing the shielding bottom cover on the groove mouth of the mounting ring groove; mounting the shielding skeleton on the base;

[0043] S3, mounting the Y waveguide, coupler and temperature sensor on the base;

[0044] fusing the two tail fibers of the optical fiber loop with the two tail fibers at one end of the Y waveguide, fusing the tail fiber at the other end of the Y waveguide with the tail fiber of the coupler, and coiling the tail fibers on the shielding bottom cover;

[0045] S4, leading the wire of the temperature sensor out of the first layer lower shielding cover through the first wire hole, and leading the tail fiber of the coupler out of the first layer lower shielding cover through the first fiber hole;

[0046] sleeving the first layer lower shielding cover on the supporting ring table and clamping the first layer upper shielding cover in the supporting ring groove;

[0047] S5, covering the second layer upper shielding cover, second layer shielding cylinder and second layer lower shielding cover outside the first layer upper shielding cover, shielding skeleton and first layer lower shielding cover;

[0048] S6, leading the wire of the temperature sensor out of the third layer shielding cover through the second wire hole, and leading the tail fiber of the coupler out of the third layer shielding cover through the second fiber hole;

[0049] covering the third layer shielding cover and third layer shielding cover outside the second layer upper shielding cover, second layer shielding cylinder and second layer lower shielding cover;

[0050] S7, testing the performance of the optical fiber loop module at this time and judging:

[0051] when the performance is unqualified, repairing the optical fiber loop module and then re-executing step S7;

[0052] when the performance is qualified, fixing and connecting the third layer shielding cover and third layer shielding cover, and completing the manufacturing of the optical fiber loop module.

[0053] The present application has the following advantages over the prior art:

[0054] 1. The optical fiber ring module with high magnetic shielding performance provided by the present application has a three-layer magnetic shielding layer structure, each layer of the magnetic shielding structure realizes full magnetic shielding of the optical fiber ring, Y waveguide, coupler, temperature sensor, and the coiled optical fiber tail fiber; the first layer and the third layer of the magnetic shielding layer are made of high magnetic permeability magnetic conductive material to shield low-frequency magnetic field interference, and the second layer of the magnetic shielding layer is made of high electrical conductivity conductive material to shield high-frequency magnetic field interference, so that the magnetic shielding performance of the optical fiber ring module is improved through the three-layer full magnetic shielding coating.

[0055] 2. The optical fiber ring module with high magnetic shielding performance provided by the present application has a three-layer magnetic shielding layer structure, each layer of the magnetic shielding structure realizes full magnetic shielding of the optical fiber ring, Y waveguide, coupler, temperature sensor, and the coiled optical fiber tail fiber; the first layer and the third layer of the magnetic shielding layer are made of high magnetic permeability magnetic conductive material to shield low-frequency magnetic field interference, and the second layer of the magnetic shielding layer is made of high electrical conductivity conductive material to shield high-frequency magnetic field interference, so that the magnetic shielding performance of the optical fiber ring module is improved through the three-layer full magnetic shielding coating.

[0056] 3. The optical fiber ring module with high magnetic shielding performance provided by the present application has a three-layer magnetic shielding layer structure, each layer of the magnetic shielding structure realizes full magnetic shielding of the optical fiber ring, Y waveguide, coupler, temperature sensor, and the coiled optical fiber tail fiber; the first layer and the third layer of the magnetic shielding layer are made of high magnetic permeability magnetic conductive material to shield low-frequency magnetic field interference, and the second layer of the magnetic shielding layer is made of high electrical conductivity conductive material to shield high-frequency magnetic field interference, so that the magnetic shielding performance of the optical fiber ring module is improved through the three-layer full magnetic shielding coating.

[0057] 4. The optical fiber ring module with high magnetic shielding performance provided by the present application has a three-layer magnetic shielding layer structure, each layer of the magnetic shielding structure realizes full magnetic shielding of the optical fiber ring, Y waveguide, coupler, temperature sensor, and the coiled optical fiber tail fiber; the first layer and the third layer of the magnetic shielding layer are made of high magnetic permeability magnetic conductive material to shield low-frequency magnetic field interference, and the second layer of the magnetic shielding layer is made of high electrical conductivity conductive material to shield high-frequency magnetic field interference, so that the magnetic shielding performance of the optical fiber ring module is improved through the three-layer full magnetic shielding coating. BRIEF DESCRIPTION OF DRAWINGS

[0058] Figure 1 is a structure explosion diagram of an embodiment of the optical fiber ring module with high magnetic shielding performance of the present application;

[0059] Figure 2 is a cross-sectional view of the embodiment of the present application;

[0060] Figure 3 is a structure diagram of the base in the embodiment of the present application, wherein (A) is a bottom view and (B) is a top view;

[0061] Figure 4 is a structure diagram of the first layer of the shielding cover in the embodiment of the present application;

[0062] Figure 5 is a structure diagram of the third layer of the shielding cover in the embodiment of the present application;

[0063] Figure 6 is a position diagram of the magnetic conductive screw in the embodiment of the present application;

[0064] Figure 7 This is a schematic diagram of the effect of the through-line boss in an embodiment of the present invention, wherein the solid arrows are magnetic lines of force after the through-line boss is set, and the dashed arrows are magnetic lines of force without the through-line boss;

[0065] Figure 8 This is a schematic diagram showing the staggered distribution of the first wire guide hole, the first fiber exit hole, the second wire guide hole, and the second fiber exit hole in an embodiment of the present invention;

[0066] Figure 9 yes Figure 8 A three-dimensional schematic diagram, where (A) is a schematic diagram of the staggered distribution and (B) is a comparative schematic diagram of the non-staggered distribution;

[0067] Figure 10 This is a schematic diagram of the structure of the third layer of shielding sleeve in an embodiment of the present invention;

[0068] Figure 11 This is a schematic diagram of the laser welding position in an embodiment of the present invention.

[0069] Icon labels:

[0070] 01-Fiber optic ring; 02-Shielding frame; 03-Shielding bottom cover;

[0071] 04-Base; 041-External mounting boss; 042-Lower mounting boss of the first layer; 043-Lower mounting boss of the third layer; 044-Fiber outlet groove; 045-Y waveguide mounting groove; 046-Coupler mounting groove; 047-Annular lifting boss; 048-Upper mounting boss of the third layer; 049-Temperature sensor mounting groove; 04a-External mounting countersunk hole; 04b-Lower mounting hole of the first layer; 04c-Lower mounting hole of the third layer; 04d-Temperature sensor cable hole; 04e-Frame mounting hole; 04f-Upper mounting hole of the first layer; 04g-Upper mounting hole of the third layer; 05-Y waveguide; 06-Coupler; 07-Temperature sensor;

[0072] 08-First layer upper shielding cover; 09-First layer lower shielding cover; 091-Support ring plate; 092-Third layer lower transition boss; 093-First external transition boss; 094-Wire guide boss; 095-Fiber exit boss; 09a-First layer mounting hole; 09b-Third layer transition hole; 09c-First external transition hole; 09d-First wire guide hole; 09e-First fiber exit hole;

[0073] 10 - Second layer upper shielding cover; 11 - Second layer shielding cylinder; 12 - Second layer lower shielding cover;

[0074] 13 - third layer shield cover, 141 - second outer transition boss, 14a - second outer transition hole, 14b - third layer mounting hole, 14c - second wire passing hole, 14d - second fiber outlet hole; 15 - third layer shield sleeve; 16 - magnetic conductive screw;

[0075] A - fiber coil region; B - laser welding position between the shield skeleton and the shield bottom cover; C - laser welding position between the third layer shield cover and the third layer shield cover. DETAILED DESCRIPTION

[0076] The specific technical solutions in the embodiments of the application will be further described below with reference to the drawings.

[0077] The application designs a fiber coil module with high magnetic shielding performance for the needs of fiber optic gyroscopes. Figures 1-2 The fiber coil module with high magnetic shielding performance provided in the embodiments of the application includes an aluminum alloy base 04, a shield skeleton 02 sleeved on the base 04, and a shield bottom cover 03.

[0078] A mounting ring groove is formed at the lower end of the shield skeleton 02, and a fiber coil 01 is arranged in the mounting ring groove. The shield bottom cover 03 is arranged on the groove opening of the mounting ring groove and is used to cooperate with the mounting ring groove to perform basic magnetic shielding on the fiber coil 01. The fiber coil 01 is adhesively fixed in the mounting ring groove, and the shield bottom cover 03 and the groove opening of the mounting ring groove are fixed by laser welding. Referring to the laser welding position B between the shield skeleton and the shield bottom cover in Figure 11

[0079] The base 04 provides a mounting reference for the fiber coil module, and is provided with a Y waveguide 05, a coupler 06, and a temperature sensor 07 thereon.

[0080] Referring to Figure 3 , a fiber outlet groove 044 is arranged at the center position of the lower surface of the base 04, and a Y waveguide mounting groove 045 and a coupler mounting groove 046 are arranged at positions on both sides of the fiber outlet groove 044. The fiber outlet groove 044 is used to lead out the tail fiber of the fiber coil 01. The Y waveguide 05 and the coupler 06 are respectively mounted on the base 04 through the Y waveguide mounting groove 045 and the coupler mounting groove 046. A temperature sensor mounting groove 049 is arranged at the center position of the upper surface of the base 04, and a skeleton mounting hole 04e is arranged along the circumference near the outer edge position. The temperature sensor 07 is mounted on the base 04 through the temperature sensor mounting groove 049. A temperature sensor wire passing hole 04d is arranged in the Y waveguide mounting groove 045 and is used to lead out the lead wire of the temperature sensor 07. An installation ring plate that matches the position of the skeleton mounting hole 04e is arranged in the middle of the inner side wall of the shield skeleton 02 and is used to mount the shield skeleton 02 on the base 04 through a screw.

[0081] ​Two tail fibers of the fiber loop 01 are connected with two tail fibers of one end of the Y waveguide 05 respectively, and one tail fiber of the other end of the Y waveguide 05 is connected with the tail fiber of the coupler 06.

[0082] Definition: the direction of the installation ring groove is downward; the inner side of the upper end of the shielding framework 02 is provided with a support ring groove; the lower surface of the shielding bottom cover 03 is provided with a support ring table; the first layer upper shielding cover 08 is embedded in the support ring groove; the first layer lower shielding cover 09 is sleeved on the support ring table; the first layer upper shielding cover 08 and the first layer lower shielding cover 09 jointly complete the first layer full magnetic shielding of the fiber loop 01, the Y waveguide 05, the coupler 06, the temperature sensor 07, and the respective coiled fiber tail fibers of the fiber loop 01, the Y waveguide 05 and the coupler 06.

[0083] The upper surface of the shielding framework 02 and the first layer upper shielding cover 08 is provided with the second layer upper shielding cover 10; the outer circumferential surface of the shielding framework 02 and the first layer lower shielding cover 09 is sleeved with the second layer shielding cylinder 11; the lower surface of the first layer lower shielding cover 09 is provided with the second layer lower shielding cover 12; the second layer upper shielding cover 10, the second layer shielding cylinder 11 and the second layer lower shielding cover 12 are respectively connected for realizing the second layer full magnetic shielding. In the embodiment, the flexible conductive material copper foil is selected, which is bonded on the outside of the first layer full magnetic shielding structure and ensures the continuity of the conduction.

[0084] The second layer upper shielding cover 10 and the second layer shielding cylinder 11 are sleeved with the third layer shielding cover 13 which is open at the lower end; the lower end of the third layer shielding cover 13 is provided with the third layer shielding cover 14; the lower surface of the base 04 is provided with at least three external mounting bosses 041, the corresponding position of the first layer lower shielding cover 09 is provided with the first external transition hole 09c, the corresponding position of the third layer shielding cover 14 is provided with the second external transition hole 14a, and the external mounting bosses 041 respectively pass through the first external transition hole 09c, the second layer lower shielding cover 12 and the second external transition hole 14a; the lower end of the external mounting boss 041 is provided with the third layer shielding sleeve 15 in interference fit; the third layer shielding cover 13, the third layer shielding cover 14 and the third layer shielding sleeve 15 are respectively connected for realizing the third layer full magnetic shielding. The third layer shielding cover 13 and the third layer shielding cover 14 are fixed by laser welding, and the laser welding position C between the third layer shielding cover and the third layer shielding cover in the reference Figure 11

[0085] ​The first layer upper shielding cover 08, the first layer lower shielding cover 09, the third layer shielding cover 13, the third layer shielding cover 14 and the third layer shielding sleeve 15 are made of magnetic conductive material and are used for shielding the interference of low-frequency magnetic field; the second layer upper shielding cover 10, the second layer shielding cylinder 11 and the second layer lower shielding cover 12 are made of conductive material and are used for shielding the interference of high-frequency magnetic field. The magnetic conductive material can be selected from common high magnetic conductive materials such as 1J50 soft magnetic alloy, 1J79 soft magnetic alloy or 1J85 soft magnetic alloy; the conductive material can be selected from common high conductive materials such as copper foil.

[0086] With reference to Figure 8 , Figure 9 , an interleaved distribution structure is designed for the interlayer leakage hole to avoid the magnetic leakage of the leakage hole directly affecting the internal components. Specifically as follows:

[0087] The first layer lower shielding cover 09 is provided with a first wire passing hole 09d and a first fiber outlet hole 09e, and the third layer shielding cover 14 is provided with a second wire passing hole 14c and a second fiber outlet hole 14d, which are respectively used for leading out the wire of the temperature sensor 07 and the tail fiber of the Y waveguide 05 and the coupler 06. The center line of the first wire passing hole 09d and the first fiber outlet hole 09e is recorded as a first layer center line, and the center line of the second wire passing hole 14c and the second fiber outlet hole 14d is recorded as a third layer center line; the projection of the first layer center line and the third layer center line in the radial plane is vertically arranged. The upper surface of the first layer lower shielding cover 09 is provided with a wire passing boss 094 and a fiber outlet boss 095 corresponding to the first wire passing hole 09d and the first fiber outlet hole 09e respectively, which are used for reducing the range of magnetic leakage.

[0088] With reference to Figure 2 , Figure 4 , Figure 5 , the tail fiber magnetic shielding is designed, specifically as follows:

[0089] The upper surface of the first layer lower shielding cover 09 is provided with a support ring plate 091, which is upward and sleeved on the support ring table to reduce the magnetic leakage.

[0090] The upper surface of the first layer lower shielding cover 09 is provided with a plurality of first external transition bosses 093 corresponding to the first external transition holes 09c respectively, which are upward and correspondingly sleeved on the external mounting boss 041; the lower surface of the third layer shielding cover 14 is provided with a plurality of second external transition bosses 141 corresponding to the second external transition holes 14a respectively, which are downward and correspondingly sleeved on the external mounting boss 041, and the lower end of the second external transition boss 141 is connected with the corresponding third layer shielding sleeve 15.

[0091] The radial space between the first layer lower shielding cover 09 and the lower surface of the shielding bottom cover 03 and between the support ring table and the first outer transition boss 093 constitutes a fiber coiling area A, which is used for coiling the fiber ring 01, the Y waveguide 05 and the fiber tail fiber of the coupler 06.

[0092] Reference Figure 4 , Figure 5 , Figure 6 , Figure 10 , and is designed for interlayer magnetic leakage. The effect is referred to Figure 7 (e.g., only the wire passing boss 094, and the effects of other bosses are similar), which can effectively limit the range of magnetic leakage and reduce the magnetic interference of internal components. Specifically as follows:

[0093] The outer mounting boss 041 is provided with an outer mounting counterbore 04a, the inner end of the third layer shielding sleeve 15 is embedded in the outer mounting counterbore 04a with interference, and the outer end edge is connected with the second outer transition boss 141 of the third layer shielding cover 14. The outer end middle part provides an external mounting interface (non-through threaded hole) of the fiber ring module.

[0094] The lower end of the base 04 is provided with three first layer lower mounting holes 04b and three third layer lower mounting holes 04c, the first layer lower shielding cover 09 is correspondingly provided with a first layer mounting hole 09a and a third layer transition hole 09b, and the third layer shielding cover 14 is provided with a third layer mounting hole 14b at the position corresponding to the third layer lower mounting hole 04c, which are respectively used for corresponding installation of the first layer lower shielding cover 09 and the third layer shielding cover 14; the upper end of the base 04 is also provided with three first layer upper mounting holes 04f and three third layer upper mounting holes 04g, and the first layer upper shielding cover 08 is provided with mounting holes and transition holes at positions corresponding to the first layer upper mounting holes 04f and the third layer upper mounting holes 04g, respectively, and the third layer shielding cover 13 is provided with mounting holes at positions corresponding to the third layer upper mounting holes 04g, respectively, which are respectively used for corresponding installation of the first layer upper shielding cover 08 and the third layer shielding cover 13.

[0095] The lower surface of the base 04 is provided with a plurality of first layer lower mounting bosses 042 corresponding to the first layer lower mounting holes 04b, respectively, and a plurality of third layer lower mounting bosses 043 corresponding to the third layer lower mounting holes 04c, respectively; the upper surface of the first layer lower shielding cover 09 is provided with a plurality of third layer lower transition bosses 092 corresponding to the third layer lower mounting bosses 043. The upper surface of the base 04 is provided with an annular lifting boss 047, and the first layer upper mounting holes 04f and the third layer upper mounting holes 04g are arranged on the annular lifting boss 047; the annular lifting boss 047 is provided with a plurality of third layer upper mounting bosses 048 corresponding to the third layer upper mounting holes 04g, respectively. The first layer lower mounting holes 04b and the third layer lower mounting holes 04c are located on the same circumference and are distributed alternately; the first layer upper mounting holes 04f and the third layer upper mounting holes 04g are located on the same circumference and are distributed alternately.

[0096] The third layer lower transition boss 092 is used for reducing the range of magnetic leakage.

[0097] Reference Figure 4 、 Figure 5 、 Figure 6 、 Figure 10 , designed for magnetic flux path breakpoint, as follows:

[0098] The first layer lower shielding cover 09 is installed on the first layer lower mounting boss 042 through the magnetic screw 16; the third layer shielding cover 14 is installed on the third layer lower mounting boss 043 through the magnetic screw 16. The first layer upper shielding cover 08 is installed in the first layer upper mounting hole 04f on the annular lifting boss 047 through the magnetic screw 16; the third layer shielding cover 13 is installed on the third layer upper mounting boss 048 through the magnetic screw 16.

[0099] The manufacturing method of the embodiment of the application is as follows:

[0100] S0, prepare the optical fiber ring 01, Y waveguide 05, coupler 06 and temperature sensor 07; prepare the shielding skeleton 02, shielding bottom cover 03, base 04, first layer upper shielding cover 08, first layer lower shielding cover 09, second layer upper shielding cover 10, second layer shielding cylinder 11, second layer lower shielding cover 12, third layer shielding cover 13, third layer shielding cover 14 and third layer shielding cover 15;

[0101] S1, the third layer shielding cover 15 is fixed on the outer mounting counterbore 04a of the base 04 respectively;

[0102] S2, the optical fiber ring 01 is glued and fixed in the mounting ring groove of the shielding skeleton 02; the tail fiber of the optical fiber ring 01 is led out to the outside of the mounting ring groove, and the shielding bottom cover 03 is laser welded and fixed on the groove of the mounting ring groove; the shielding skeleton 02 is installed on the base 04 through the screw;

[0103] S3, the Y waveguide 05, the coupler 06 and the temperature sensor 07 are installed on the base 04;

[0104] The two tail fibers of the optical fiber ring 01 are respectively fused with the two tail fibers of one end of the Y waveguide 05, one tail fiber of the other end of the Y waveguide 05 is fused with the tail fiber of the coupler 06, and each tail fiber is coiled on the shielding bottom cover 03;

[0105] The wire of the temperature sensor 07 is led out to one side of the Y waveguide 05 and the coupler 06 through the temperature sensor wire hole 04d on the base 04, which is convenient for wiring;

[0106] S4, the wire of temperature sensor 07 is led out of the first layer lower shielding cover 09 through the first wire hole 09d, and the tail fiber of the coupler 06 is led out of the first layer lower shielding cover 09 through the first fiber hole 09e;

[0107] The first layer lower shielding cover 09 is sleeved on the support ring table, and the first layer upper shielding cover 08 is clamped in the support ring groove; the first layer lower shielding cover 09 and the first layer upper shielding cover 08 are installed on the base 04 through the magnetic screw 16 respectively;

[0108] S5, the second layer upper shielding cover 10, the second layer shielding cylinder 11 and the second layer lower shielding cover 12 are covered outside the first layer upper shielding cover 08, the shielding skeleton 02 and the first layer lower shielding cover 09;

[0109] S6, the wire of temperature sensor 07 is led out of the third layer shielding cover 14 through the second wire hole 14c, and the tail fiber of the coupler 06 is led out of the third layer shielding cover 14 through the second fiber hole 14d;

[0110] The third layer shielding cover 13 and the third layer shielding cover 14 are covered outside the second layer upper shielding cover 10, the second layer shielding cylinder 11 and the second layer lower shielding cover 12; the third layer shielding cover 13 and the third layer shielding cover 14 are installed on the base 04 through the magnetic screw 16 respectively;

[0111] S7, test the performance of the optical fiber ring module at this time, and judge:

[0112] When the performance is unqualified (such as out of tolerance), the optical fiber ring module is repaired, and then step S7 is re-executed;

[0113] When the performance is qualified, the third layer shielding cover 13 and the third layer shielding cover 14 are laser welded and fixedly connected, and the production of the optical fiber ring module is completed.

[0114] The above content is only one embodiment of the application, and is not a limitation on the protection scope of the application. Any equivalent transformation or direct or indirect application in other related technical fields based on the content of the specification and drawings of the application is included in the patent protection scope of the application.

Claims

1. An optical fiber ring module with high magnetic shielding performance, comprising a base (04), a shielding skeleton (02) sleeved on the base (04), and a shielding bottom cover (03); characterized in that: a mounting ring groove is formed at the lower end of the shielding skeleton (02), an optical fiber ring (01) is arranged in the mounting ring groove, and the shielding bottom cover (03) is arranged on the opening of the mounting ring groove to cooperate with the mounting ring groove to perform basic magnetic shielding on the optical fiber ring (01); a Y waveguide (05), a coupler (06), and a temperature sensor (07) are mounted on the base (04); two tail fibers of the optical fiber ring (01) are connected with two tail fibers at one end of the Y waveguide (05), and one tail fiber at the other end of the Y waveguide (05) is connected with a tail fiber of the coupler (06); a support ring groove is formed at the upper end of the shielding skeleton (02); a support ring table is arranged on the lower surface of the shielding bottom cover (03); a first layer of upper shielding covers (08) are embedded in the support ring groove; a first layer of lower shielding covers (09) are sleeved on the support ring table; the first layer of upper shielding covers (08) and the first layer of lower shielding covers (09) are used to realize first layer full magnetic shielding; a second layer of upper shielding covers (10) are arranged on the upper surfaces of the shielding skeleton (02) and the first layer of upper shielding covers (08); a second layer of shielding cylinders (11) are sleeved on the outer circumferential surfaces of the shielding skeleton (02) and the first layer of lower shielding covers (09); a second layer of lower shielding covers (12) are arranged on the lower surfaces of the first layer of lower shielding covers (09); the second layer of upper shielding covers (10), the second layer of shielding cylinders (11), and the second layer of lower shielding covers (12) are correspondingly connected to realize second layer full magnetic shielding; a third layer of shielding covers (13) with open lower ends are sleeved on the second layer of upper shielding covers (10) and the second layer of shielding cylinders (11); third layer shielding covers (14) are arranged at the lower ends of the third layer of shielding covers (13); at least three external mounting bosses (041) are arranged on the lower surface of the base (04); first external transition holes (09c) are formed at corresponding positions of the first layer of lower shielding covers (09); second external transition holes (14a) are formed at corresponding positions of the third layer shielding covers (14); the external mounting bosses (041) respectively pass through the first external transition holes (09c), the second layer of lower shielding covers (12), and the second external transition holes (14a); third layer shielding sleeves (15) are arranged at the lower ends of the external mounting bosses (041); the third layer of shielding covers (13), the third layer shielding covers (14), and the third layer shielding sleeves (15) are correspondingly connected to realize third layer full magnetic shielding; first wire passing holes (09d) and first fiber outlet holes (09e) are formed on the first layer of lower shielding covers (09); second wire passing holes (14c) and second fiber outlet holes (14d) are formed on the third layer shielding covers (14), which are respectively used to lead out the wires of the temperature sensor (07) and the tail fibers of the Y waveguide (05) and the coupler (06). ​ The first layer upper shielding cover (08), the first layer lower shielding cover (09), the third layer shielding cover (13), the third layer shielding cover (14) and the third layer shielding cover (15) are made of magnetic conductive material, which is used for shielding the interference of low frequency magnetic field; the second layer upper shielding cover (10), the second layer shielding cover (11) and the second layer lower shielding cover (12) are made of electrically conductive material, which is used for shielding the interference of high frequency magnetic field.

2. The fiber ring module with high magnetic shielding performance according to claim 1, wherein: The upper surface of the first layer lower shielding cover (09) is provided with a support ring plate (091) which is upward and sleeved on the support ring table; The upper surface of the first layer lower shielding cover (09) is provided with a plurality of first external transition bosses (093) corresponding to the first external transition holes (09c) respectively, the first external transition bosses (093) are upward and sleeved on the external mounting bosses (041) correspondingly; The lower surface of the third layer shielding cover (14) is provided with a plurality of second external transition bosses (141) corresponding to the second external transition holes (14a) respectively, the second external transition bosses (141) are downward and sleeved on the external mounting bosses (041) correspondingly, and the lower end of the second external transition bosses (141) is connected with the corresponding third layer shielding cover (15); The radial space between the first layer lower shielding cover (09) and the lower surface of the shielding bottom cover (03) and between the support ring table and the first external transition bosses (093) constitutes a fiber coiling area (A), which is used for coiling the tail fibers of the fiber ring (01), the Y waveguide (05) and the coupler (06).

3. The fiber ring module with high magnetic shielding performance according to claim 2, wherein: The external mounting bosses (041) are provided with external mounting counterbores (04a), the inner end of the third layer shielding cover (15) is embedded in the external mounting counterbores (04a), and the outer end edge is connected with the second external transition bosses (141) of the third layer shielding cover (14); The lower end of the base (04) is provided with at least three first layer lower mounting holes (04b) and at least three third layer lower mounting holes (04c), the first layer lower shielding cover (09) is provided with first layer mounting holes (09a) and third layer transition holes (09b) correspondingly, and the third layer shielding cover (14) is provided with third layer mounting holes (14b) at the positions of the third layer lower mounting holes (04c) correspondingly, which are used for mounting the first layer lower shielding cover (09) and the third layer shielding cover (14) correspondingly. The upper end of the base (04) is further provided with at least three first layer upper mounting holes (04f) and at least three third layer upper mounting holes (04g), the first layer upper shielding cover (08) is provided with mounting holes and transition holes at positions corresponding to the first layer upper mounting holes (04f) and the third layer upper mounting holes (04g) respectively, and the third layer shielding cover (13) is provided with mounting holes corresponding to the third layer upper mounting holes (04g) respectively, which are used for mounting the first layer upper shielding cover (08) and the third layer shielding cover (13) respectively.

4. The fiber loop module with high magnetic shielding performance according to claim 3, wherein: The lower surface of the base (04) is provided with a plurality of first layer lower mounting bosses (042) corresponding to the first layer lower mounting holes (04b) respectively, and a plurality of third layer lower mounting bosses (043) corresponding to the third layer lower mounting holes (04c) respectively; the upper surface of the first layer lower shielding cover (09) is provided with a plurality of third layer lower transition bosses (092) corresponding to the third layer lower mounting bosses (043) respectively; The upper surface of the base (04) is provided with an annular lifting boss (047), and the first layer upper mounting holes (04f) and the third layer upper mounting holes (04g) are arranged on the annular lifting boss (047); the annular lifting boss (047) is provided with a plurality of third layer upper mounting bosses (048) corresponding to the third layer upper mounting holes (04g) respectively; The third layer lower transition boss (092) is used for reducing the range of magnetic leakage; The first layer lower shielding cover (09) is mounted on the first layer lower mounting boss (042) through a magnetic conductive screw (16); and the third layer shielding cover (14) is mounted on the third layer lower mounting boss (043) through a magnetic conductive screw (16); The first layer upper shielding cover (08) is mounted in the first layer upper mounting hole (04f) on the annular lifting boss (047) through a magnetic conductive screw (16); and the third layer shielding cover (13) is mounted on the third layer upper mounting boss (048) through a magnetic conductive screw (16).

5. The fiber loop module with high magnetic shielding performance according to claim 4, wherein: The first layer lower mounting holes (04b) and the third layer lower mounting holes (04c) are located on the same circumference and are staggered; and the first layer upper mounting holes (04f) and the third layer upper mounting holes (04g) are located on the same circumference and are staggered.

6. The fiber loop module with high magnetic shielding performance according to any one of claims 1-5, wherein: The center line of the first wire passing hole (09d) and the first fiber outlet hole (09e) is recorded as a first layer center line, and the center line of the second wire passing hole (14c) and the second fiber outlet hole (14d) is recorded as a third layer center line; the projection of the first layer center line and the third layer center line in the radial plane is cross-shaped.

7. The fiber loop module with high magnetic shielding performance according to claim 6, wherein: The upper surface of the first layer lower shielding cover (09) is provided with a wire passing boss (094) and a fiber outlet boss (095) corresponding to the first wire passing hole (09d) and the first fiber outlet hole (09e) respectively; The wire passing boss (094) and the fiber outlet boss (095) are used for reducing the range of magnetic leakage.

8. The optical fiber ring module with high magnetic shielding performance according to claim 7, characterized in that: The projection of the first layer center line and the third layer center line in the radial plane is perpendicular.

9. The optical fiber ring module with high magnetic shielding performance according to claim 1, characterized in that: The lower surface of the base (04) is provided with a fiber outlet groove (044) at the center position, and a Y waveguide mounting groove (045) and a coupler mounting groove (046) are respectively arranged at the positions on both sides of the fiber outlet groove (044); The fiber outlet groove (044) is used for leading out the tail fiber of the optical fiber ring (01); the Y waveguide (05) and the coupler (06) are respectively mounted on the base (04) through the Y waveguide mounting groove (045) and the coupler mounting groove (046); The upper surface of the base (04) is provided with a temperature sensor mounting groove (049) at the center position, and a skeleton mounting hole (04e) is arranged on the upper surface of the base (04) near the outer edge in the circumferential direction; The temperature sensor (07) is mounted on the base (04) through the temperature sensor mounting groove (049); the Y waveguide mounting groove (045) is provided with a temperature sensor wire passing hole (04d) for leading out the wire of the temperature sensor (07); The inner side wall of the shielding skeleton (02) is provided with a mounting ring plate matched with the position of the skeleton mounting hole (04e), which is used for mounting the shielding skeleton (02) on the base (04); The optical fiber ring (01) is glued and fixed in the mounting ring groove, and the shielding bottom cover (03) and the slot opening of the mounting ring groove are fixed by laser welding; the third layer shielding cover (13) and the third layer shielding cover (14) are fixed by laser welding.

10. A method for manufacturing an optical fiber loop module with high magnetic shielding performance, for manufacturing the optical fiber loop module with high magnetic shielding performance according to any one of claims 1-9, characterized in that, The steps include: S0, preparing the optical fiber ring (01), the Y waveguide (05), the coupler (06) and the temperature sensor (07); preparing the shielding skeleton (02), the shielding bottom cover (03), the base (04), the first layer upper shielding cover (08), the first layer lower shielding cover (09), the second layer upper shielding cover (10), the second layer shielding cylinder (11), the second layer lower shielding cover (12), the third layer shielding cover (13), the third layer shielding cover (14) and the third layer shielding cover (15); S1, fixing the third layer shielding cover (15) on the base (04); S2, fixing the optical fiber ring (01) in the mounting ring groove of the shielding skeleton (02); leading out the tail fiber of the optical fiber ring (01) to the outside of the mounting ring groove, and fixing the shielding bottom cover (03) on the slot opening of the mounting ring groove; mounting the shielding skeleton (02) on the base (04); S3, mounting the Y waveguide (05), the coupler (06) and the temperature sensor (07) on the base (04); S4, mounting the first layer upper shielding cover (08) and the first layer lower shielding cover (09) on the shielding skeleton (02); mounting the second layer upper shielding cover (10) and the second layer lower shielding cover (12) on the shielding bottom cover (03); mounting the third layer shielding cover (13) and the third layer shielding cover (14) on the base (04); and mounting the third layer shielding cover (15) on the third layer shielding cover (13). Two tail fibers of the fiber loop (01) are respectively fused with two tail fibers at one end of the Y waveguide (05), one tail fiber at the other end of the Y waveguide (05) is fused with a tail fiber of the coupler (06), and each tail fiber is coiled on the shielding bottom cover (03); S4, the wire of the temperature sensor (07) is passed out of the first layer lower shielding cover (09) through the first wire hole (09d), and the tail fiber of the coupler (06) is passed out of the first layer lower shielding cover (09) through the first fiber hole (09e); The first layer lower shielding cover (09) is sleeved on the support ring table, and the first layer upper shielding cover (08) is clamped in the support ring groove; S5, the second layer upper shielding cover (10), the second layer shielding cylinder (11) and the second layer lower shielding cover (12) are covered outside the first layer upper shielding cover (08), the shielding framework (02) and the first layer lower shielding cover (09); S6, the wire of the temperature sensor (07) is passed out of the third layer shielding cover (14) through the second wire hole (14c), and the tail fiber of the coupler (06) is passed out of the third layer shielding cover (14) through the second fiber hole (14d); The third layer shielding cover (13) and the third layer shielding cover (14) are covered outside the second layer upper shielding cover (10), the second layer shielding cylinder (11) and the second layer lower shielding cover (12); S7, test the performance of the fiber loop module at this time, and judge: When the performance is unqualified, the fiber loop module is repaired, and then step S7 is executed again; When the performance is qualified, the third layer shielding cover (13) and the third layer shielding cover (14) are fixedly connected, and the production of the fiber loop module is completed.

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