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

Abstract

The invention relates to an optical fiber ring module with high magnetic shielding performance and a manufacturing method thereof, and solves the technical problem of limited magnetic shielding performance in the prior art. The shielding device comprises a base, a shielding framework sleeving the base and a shielding bottom cover, an optical fiber ring is arranged in the shielding framework; a Y waveguide, a coupler and a temperature sensor are mounted on the base; a first-layer upper shielding cover and a first-layer lower shielding cover are respectively arranged on the outer layer to realize first-layer full magnetic shielding; a second-layer upper shielding cover, a second-layer shielding cylinder and a second-layer lower shielding cover are correspondingly connected to realize second-layer full magnetic shielding; and a third-layer shielding cover is arranged, and the third-layer shielding cover and the third-layer shielding sleeve are correspondingly connected to realize third-layer full-magnetic shielding. Wherein the first magnetic shielding layer and the third magnetic shielding layer are made of magnetic conductive materials so as to shield interference of a low-frequency magnetic field, the middle second magnetic shielding layer is made of conductive materials so as to shield interference of a high-frequency magnetic field, and the magnetic shielding performance is improved through three-layer full magnetic shielding coating.

Description

Technical Field

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

[0002] Fiber optic gyroscope is a fully solid-state inertial measurement instrument based on the Sagnac effect. It has the advantages of impact resistance, high sensitivity, long life, large dynamic range, and short startup time. It is widely used in aerospace, aviation, navigation and other fields. With the development of technology, the application scenarios of fiber optic gyroscopes are constantly changing, and the external magnetic field environment they face is becoming more and more complex. As the core component of the fiber optic gyroscope, the stable operation of the fiber optic ring module is the main factor determining the accuracy of the fiber optic gyroscope.

[0003] The fiber ring module is easily disturbed by the external magnetic field and produces a magnetically non-reciprocal phase difference, which reduces the measurement accuracy of the fiber optic gyroscope and thus affects the accuracy of navigation and positioning. In addition, the increasingly complex external magnetic field environment further restricts the engineering application of high-precision fiber optic gyroscopes.

[0004] The existing magnetic shielding scheme of the fiber ring module is mainly to perform magnetic shielding on the fiber ring. For example, Chinese patent CN102620728A discloses a double-layer magnetic protection ring-forming device for high-precision fiber optic gyroscopes. The problems are as follows: the fiber ring is subjected to double-layer magnetic shielding, but the Y waveguide, as well as the Y waveguide and the fiber ring coiled pigtail are only subjected to single-layer magnetic shielding; the magnetic shielding of the leakage hole position and the inner layer matching installation position is not considered, resulting in a large amount of magnetic leakage; high-frequency magnetic shielding is not considered. Chinese patent CN110672085B discloses a fiber optic gyroscope and assembly method based on single-layer magnetic shielding and double-layer thermal insulation, and Chinese patent CN112880658A discloses a fiber optic gyroscope with a double-layer magnetic shielding structure, and the problems they have are similar.

[0005] Most existing magnetic shielding solutions only consider low-frequency magnetic shielding, and lack effective magnetic shielding measures in Y-waveguides, couplers, and fiber pigtails. In addition, due to structural limitations, magnetic shielding of leaky holes such as fiber outlet holes, cable holes, and external installation interfaces is also difficult to achieve. The above reasons lead to limited magnetic shielding performance of fiber ring modules, and thus cannot meet the increasing magnetic shielding performance requirements of fiber optic gyroscopes.

[0006] Patent content

[0007] The purpose of the present invention is to solve the technical problem of limited magnetic shielding performance in the prior art and to provide an optical fiber ring module with high magnetic shielding performance and a manufacturing method thereof.

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

[0009] A fiber optic ring module with high magnetic shielding performance comprises a base, a shielding frame mounted on the base, and a shielding bottom cover; the special features thereof are:

[0010] The lower end of the shielding frame is provided with a mounting ring groove, in which a fiber ring is provided, and a shielding bottom cover is arranged on the notch of the mounting ring groove, and is used to cooperate with the mounting ring groove to perform basic magnetic shielding on the fiber ring; a Y waveguide, a coupler and a temperature sensor are installed on the base; two pigtails of the fiber ring are respectively connected to two pigtails at one end of the Y waveguide, and a pigtail at the other end of the Y waveguide is connected to the pigtail of the coupler;

[0011] Definition: The direction of the mounting ring groove is downward;

[0012] A supporting ring groove is provided at the upper end of the shielding frame; a supporting ring platform is provided on the lower surface of the shielding bottom cover; a first-layer upper shielding cover is embedded in the supporting ring groove, and a first-layer lower shielding cover is mounted on the supporting ring platform. The first-layer upper shielding cover and the first-layer lower shielding cover are used to realize the first-layer full magnetic shielding;

[0013] A second layer of upper shielding cover is provided on the upper surface of the shielding frame and the first layer of upper shielding cover; a second layer of shielding cylinder is sleeved on the outer circumference of the shielding frame and the first layer of lower shielding cover; a second layer of lower shielding cover is provided on the lower surface of the first layer of lower shielding cover; the second layer of upper shielding cover, the second layer of shielding cylinder and the second layer of lower shielding cover are respectively connected correspondingly to realize the second layer of full magnetic shielding;

[0014] A third shielding cover with an opening at the lower end is sleeved on the second upper shielding cover and the second shielding cylinder; a third shielding cover is provided at the lower end of the third shielding cover; at least three external mounting bosses are provided on the lower surface of the base, a first external transition hole is provided at the corresponding position of the first lower shielding cover, a second external transition hole is provided at the corresponding position of the third shielding cover, and the external mounting bosses pass through the first external transition hole, the second lower shielding cover, and the second external transition hole respectively; a third shielding sleeve is provided at the lower end of the external mounting boss; the third shielding cover, the third shielding cover and the third shielding sleeve are connected correspondingly, respectively, to achieve the third layer of full magnetic shielding;

[0015] The first layer of lower shielding cover is provided with a first wire hole and a first fiber outlet hole, and the third layer of shielding cover is provided with a second wire hole and a second fiber outlet hole, which are used to lead out the wire of the temperature sensor and the pigtail of the Y waveguide and the coupler respectively;

[0016] The first upper shielding cover, the first lower shielding cover, the third shielding cover, the third shielding cover and the third shielding sleeve are made of magnetic conductive materials to shield the interference of low-frequency magnetic fields; the second upper shielding cover, the second shielding tube and the second lower shielding cover are made of conductive materials to shield the interference of high-frequency magnetic fields.

[0017] Furthermore, a support ring plate is provided on the outer edge of the upper surface of the first layer lower shielding cover, the support ring plate is directed upward and is sleeved on the support ring platform;

[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 first external transition bosses are directed upward and are correspondingly sleeved on the external mounting bosses;

[0019] The lower surface of the third shielding cover is provided with a plurality of second external transition bosses corresponding to the second external transition holes respectively, the second external transition bosses are oriented downward and are correspondingly sleeved on the external mounting bosses, and the lower ends of the second external transition bosses are connected to the corresponding third shielding sleeves;

[0020] The radial space between the lower surface of the first lower shielding cover and the shielding bottom cover and between the supporting ring platform and the first external transition boss constitutes the optical fiber winding area A, which is used to wind the optical fiber ring, Y waveguide and pigtail of the coupler.

[0021] Furthermore, an external mounting countersunk hole is provided on the external mounting boss, the inner end of the third shielding sleeve is embedded in the external mounting countersunk hole, and the outer end edge is connected to the second external transition boss of the third 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 provided with first-layer mounting holes and third-layer transition holes correspondingly, and the third-layer shielding cover is provided with third-layer mounting holes corresponding to the positions of the third-layer lower mounting holes, which are used to respectively install the first-layer lower shielding cover and the third-layer shielding cover;

[0023] The upper end of the base is also 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 mounting holes and transition holes corresponding to the first-layer upper mounting holes and the third-layer upper mounting holes, and the third-layer shielding cover is provided with mounting holes corresponding to the third-layer upper mounting holes, which are respectively used for correspondingly installing 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 respectively corresponding to the first-layer lower mounting holes, and a plurality of third-layer lower mounting bosses respectively corresponding to the third-layer lower mounting holes; the upper surface of the first-layer lower shielding cover is provided with a plurality of third-layer lower transition bosses correspondingly sleeved on the third-layer lower mounting bosses;

[0025] An annular lifting boss is provided on the upper surface of the base, 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 of lower transition boss is used to reduce the range of magnetic leakage;

[0027] The first layer of lower shielding cover is installed on the first layer of lower mounting boss through magnetic conductive screws; the third layer of shielding cover is installed on the third layer of lower mounting boss through magnetic conductive screws;

[0028] The first-layer upper shielding cover is installed in the first-layer upper mounting hole on the annular lifting boss through magnetic conductive screws; the third-layer shielding cover is installed on the third-layer upper mounting boss through magnetic conductive screws.

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

[0030] Furthermore, the center line of the first wire hole and the first fiber outlet hole is recorded as the first layer center line, and the center line of the second wire hole and the second fiber outlet hole is recorded as the third layer center line; the projections of the first layer center line and the third layer center line in the radial plane are cross-arranged.

[0031] Furthermore, 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; the wire passing boss and the fiber outlet boss are both used to reduce the range of magnetic leakage.

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

[0033] Furthermore, a fiber outlet slot is provided at the center of the lower surface of the base, and a Y-waveguide mounting slot and a coupler mounting slot are provided at both sides of the fiber outlet slot;

[0034] The fiber outlet slot is used to lead out the pigtail of the optical fiber ring; the Y waveguide and the coupler are installed on the base through the Y waveguide installation slot and the coupler installation slot respectively;

[0035] A temperature sensor mounting groove is provided at the center of the upper surface of the base, and a frame mounting hole is provided along the circumferential direction near the outer edge of the upper surface of the base;

[0036] The temperature sensor is installed on the base through the temperature sensor installation groove; a temperature sensor wire hole is provided in the Y waveguide installation groove for leading out the wire of the temperature sensor;

[0037] A mounting ring plate matching the mounting hole of the frame is provided in the middle of the inner side wall of the shielding frame, and is used to mount the shielding frame on the base;

[0038] The optical fiber ring is glued and fixed in the installation ring groove, the shielding bottom cover and the notch of the installation ring groove are fixed by laser welding; the third shielding cover and the third shielding cover are fixed by laser welding.

[0039] The present invention also provides a method for manufacturing an optical fiber ring module with high magnetic shielding performance, which is used to manufacture the above-mentioned optical fiber ring module with high magnetic shielding performance, and the method is special in that it comprises the following steps:

[0040] S0, prepare the optical fiber ring, Y waveguide, coupler and temperature sensor; prepare the shielding frame, 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, third layer shielding cover and third layer shielding sleeve;

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

[0042] S2, fix the optical fiber ring in the mounting ring groove of the shielding frame; lead the pigtail of the optical fiber ring out of the mounting ring groove, and fix the shielding bottom cover on the notch of the mounting ring groove; install the shielding frame on the base;

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

[0044] The two pigtails of the optical fiber ring are respectively fused with the two pigtails at one end of the Y waveguide, and one pigtail at the other end of the Y waveguide is fused with the pigtail of the coupler, and each pigtail is coiled on the shielding bottom cover;

[0045] S4, passing the wire of the temperature sensor through the first wire hole and out of the first lower shielding cover, and passing the pigtail of the coupler through the first fiber outlet hole and out of the first lower shielding cover;

[0046] Put the first layer of lower shielding cover on the support ring platform, and clamp the first layer of upper shielding cover into the support ring groove;

[0047] S5, covering the outer sides of the first upper shielding cover, the shielding frame and the first lower shielding cover with the second upper shielding cover, the second shielding tube and the second lower shielding cover;

[0048] S6, pass the wire of the temperature sensor through the second wire hole and out of the third shielding cover, and pass the pigtail of the coupler through the second fiber outlet hole and out of the third shielding cover;

[0049] The third shielding case and the third shielding cover are covered on the outer sides of the second upper shielding cover, the second shielding tube and the second lower shielding cover;

[0050] S7, test the performance of the fiber ring module at this time and determine:

[0051] When the performance is unqualified, the optical fiber ring module is repaired and then step S7 is performed again;

[0052] When the performance is qualified, the third shielding cover and the third shielding cap are fixedly connected to complete the production of the optical fiber ring module.

[0053] The beneficial effects of the present invention compared with the prior art are as follows:

[0054] 1. The present invention provides an optical fiber ring module with high magnetic shielding performance, and designs 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 each coiled optical fiber pigtail; wherein the first and third magnetic shielding layers are made of magnetic conductive materials with high magnetic permeability to shield the interference of low-frequency magnetic fields, and the second magnetic shielding layer in the middle is made of conductive materials with high electrical conductivity to shield the interference of high-frequency magnetic fields. The magnetic shielding performance of the optical fiber ring module is improved through the three-layer full magnetic shielding coating.

[0055] 2. The present invention provides a fiber optic ring module with high magnetic shielding performance, in which the leakage holes between the three-layer magnetic shielding layer structures are all provided with a boss structure, which effectively reduces the range of magnetic leakage between the layers; the mounting screws are all changed into magnetic conductive screws, which effectively reduces the magnetic path breakpoints of the overall structure; thereby improving the magnetic shielding performance of the fiber optic ring module.

[0056] 3. The present invention provides a fiber optic ring module with high magnetic shielding performance, in which the wire holes and fiber outlet holes on the first and third magnetic shielding layers are designed to be staggered, thereby reducing the size of magnetic leakage between layers and thereby improving the magnetic shielding performance of the fiber optic ring module.

[0057] 4. The present invention provides a method for manufacturing an optical fiber ring module with high magnetic shielding performance, which has easy parts processing, short manufacturing process, simple manufacturing method, high production efficiency and low production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 It is a structural exploded diagram of an embodiment of a fiber optic ring module with high magnetic shielding performance of the present invention;

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

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

[0061] Figure 4 is a schematic structural diagram of the first layer lower shielding cover in an embodiment of the present invention;

[0062] Figure 5 is a schematic structural diagram of the third shielding cover in an embodiment of the present invention;

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

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

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

[0066] Fig. 9 yes Figure 8 Schematic diagram of a three-dimensional structure, wherein (A) is a schematic diagram of staggered distribution, and (B) is a comparative schematic diagram without staggered distribution;

[0067] Fig.10 is a schematic structural diagram of the third shielding sleeve in an embodiment of the present invention;

[0068] Fig.11 Schematic diagram of the laser welding position in the embodiment of the present invention.

[0069] Figure Number:

[0070] 01-fiber ring; 02-shielding frame; 03-shielding bottom cover;

[0071] 04-base, 041-external mounting boss, 042-first layer lower mounting boss, 043-third layer lower mounting boss, 044-fiber outlet slot, 045-Y waveguide mounting slot, 046-coupler mounting slot, 047-annular lifting boss, 048-third layer upper mounting boss, 049-temperature sensor mounting slot, 04a-external mounting countersunk hole, 04b-first layer lower mounting hole, 04c-third layer lower mounting hole, 04d-temperature sensor wire hole, 04e-skeleton mounting hole, 04f-first layer upper mounting hole, 04g-third layer upper mounting hole; 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 boss, 095-fiber outlet boss, 09a-first layer mounting hole, 09b-third layer transition hole, 09c-first external transition hole, 09d-first wire hole, 09e-first fiber outlet hole;

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

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

[0075] A-fiber winding area; B-laser welding position between the shielding frame and the shielding bottom cover; C-laser welding position between the third shielding cover and the third shielding cover. DETAILED DESCRIPTION

[0076] The specific technical solutions in the embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0077] Aiming at the requirements of the fiber optic gyroscope, the present invention designs a fiber optic ring module with high magnetic shielding performance. Figure 1-Figure 2 An optical fiber ring module with high magnetic shielding performance provided in an embodiment of the present invention comprises a base 04 made of aluminum alloy, a shielding frame 02 mounted on the base 04, and a shielding bottom cover 03.

[0078] The lower end of the shielding frame 02 is provided with a mounting ring groove, in which a fiber ring 01 is provided, and the shielding bottom cover 03 is arranged on the notch of the mounting ring groove, and is used to cooperate with the mounting ring groove to perform basic magnetic shielding on the fiber ring 01; the fiber ring 01 is glued and fixed in the mounting ring groove, and the shielding bottom cover 03 and the notch of the mounting ring groove are fixed by laser welding, refer to Fig.11 Laser welding position B between the shield frame and the shield bottom cover.

[0079] The base 04 provides a mounting base for the optical fiber ring module, on which a Y-waveguide 05 , a coupler 06 and a temperature sensor 07 are arranged.

[0080] refer to Figure 3 , a fiber outlet slot 044 is provided at the center of the lower surface of the base 04, and a Y-waveguide mounting slot 045 and a coupler mounting slot 046 are provided on both sides of the fiber outlet slot 044; the fiber outlet slot 044 is used to lead out the pigtail of the optical fiber ring 01; the Y-waveguide 05 and the coupler 06 are respectively installed on the base 04 through the Y-waveguide mounting slot 045 and the coupler mounting slot 046; a temperature sensor mounting slot 049 is provided at the center of the upper surface of the base 04, and a frame mounting hole 04e is provided along the circumferential direction near the outer edge; the temperature sensor 07 is installed on the base 04 through the temperature sensor mounting slot 049; a temperature sensor wire hole 04d is provided in the Y-waveguide mounting slot 045, which is used to lead out the wire of the temperature sensor 07. A mounting ring plate matching the position of the frame mounting hole 04e is provided in the middle of the inner side wall of the shielding frame 02, which is used to mount the shielding frame 02 on the base 04 by screws.

[0081] The two pigtails of the optical fiber ring 01 are respectively connected to the two pigtails at one end of the Y waveguide 05 , and one pigtail at the other end of the Y waveguide 05 is connected to the pigtail of the coupler 06 .

[0082] Definition: The direction of the installation ring groove is downward; a supporting ring groove is opened at the inner upper end of the shielding frame 02; a supporting ring platform is provided on the lower surface of the shielding bottom cover 03; a first-layer upper shielding cover 08 is embedded in the supporting ring groove, and a first-layer lower shielding cover 09 is mounted on the supporting ring platform. The first-layer upper shielding cover 08 and the first-layer lower shielding cover 09 together complete the first layer of full magnetic shielding for the optical fiber ring 01, Y-waveguide 05, coupler 06, temperature sensor 07, and the optical fiber pigtails wound around the optical fiber ring 01, Y-waveguide 05 and coupler 06.

[0083] The upper surface of the shielding frame 02 and the first upper shielding cover 08 is provided with a second upper shielding cover 10; the outer peripheral surface of the shielding frame 02 and the first lower shielding cover 09 is provided with a second shielding cylinder 11; the lower surface of the first lower shielding cover 09 is provided with a second lower shielding cover 12; the second upper shielding cover 10, the second shielding cylinder 11 and the second lower shielding cover 12 are respectively connected correspondingly to realize the second layer of full magnetic shielding. In this embodiment, a flexible conductive material copper foil is selected and bonded to the outside of the first layer of full magnetic shielding structure, and the conductive continuity is ensured.

[0084] The second-layer upper shielding cover 10 and the second-layer shielding tube 11 are sleeved with a third-layer shielding cover 13 with an opening at the lower end; the third-layer shielding cover 13 is provided with a third-layer shielding cover 14 at the lower end; at least three external mounting bosses 041 are provided on the lower surface of the base 04, a first external transition hole 09c is opened at the corresponding position of the first-layer lower shielding cover 09, and a second external transition hole 14a is opened at the corresponding position of the third-layer shielding cover 14, and the external mounting bosses 041 pass through the first external transition hole 09c, the second-layer lower shielding cover 12, and the second external transition hole 14a respectively; the lower end of the external mounting boss 041 is provided with a third-layer shielding sleeve 15 by interference fit; the third-layer shielding cover 13, the third-layer shielding cover 14 and the third-layer shielding sleeve 15 are respectively connected correspondingly to realize the third-layer full magnetic shielding. The third-layer shielding cover 13 and the third-layer shielding cover 14 are fixed by laser welding, refer to Fig.11 Laser welding position C between the third shielding cover and the third shielding lid.

[0085] The first upper shielding cover 08, the first lower shielding cover 09, the third shielding cover 13, the third shielding cover 14 and the third shielding sleeve 15 are made of magnetic conductive materials to shield the interference of low-frequency magnetic fields; the second upper shielding cover 10, the second shielding tube 11 and the second lower shielding cover 12 are made of conductive materials to shield the interference of high-frequency magnetic fields. The magnetic conductive materials can be selected from common high magnetic permeability materials such as 1J50 soft magnetic alloy, 1J79 soft magnetic alloy or 1J85 soft magnetic alloy; the conductive materials can be selected from common high electrical conductivity materials such as copper foil.

[0086] refer to Figure 8 , Fig. 9 , a staggered distribution structure is designed for interlayer leakage holes to prevent magnetic leakage from directly affecting internal components. The details are as follows:

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

[0088] refer to Figure 2 , Figure 4 , Figure 5 , the design is made for the magnetic shielding of the pigtail, as follows:

[0089] A support ring plate 091 is provided on the outer edge of the upper surface of the first layer lower shielding cover 09. The support ring plate 091 is directed upward and is mounted on the support ring platform to reduce 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 respectively corresponding to the first external transition holes 09c, the first external transition bosses 093 are oriented upward and are correspondingly sleeved on the external mounting bosses 041; the lower surface of the third layer shielding cover 14 is provided with a plurality of second external transition bosses 141 respectively corresponding to the second external transition holes 14a, the second external transition bosses 141 are oriented downward and are correspondingly sleeved on the external mounting bosses 041, and the lower ends of the second external transition bosses 141 are connected to the corresponding third layer shielding sleeve 15;

[0091] The radial space between the first lower shielding cover 09 and the lower surface of the shielding bottom cover 03 and between the supporting ring platform and the first external transition boss 093 constitutes the optical fiber winding area A, which is used to wind the optical fiber pigtails of the optical fiber ring 01, Y waveguide 05 and coupler 06.

[0092] refer to Figure 4 , Figure 5 , Figure 6 , Fig.10 , designed for interlayer magnetic leakage. Effect reference Figure 7 (Only the over-line boss 094 is used as an example, the effects of other bosses are similar), which can effectively limit the scope of magnetic leakage and reduce the magnetic interference of internal components. The details are as follows:

[0093] The external mounting boss 041 is provided with an external mounting counterbore 04a, the inner end of the third shielding sleeve 15 is interference fit in the external mounting counterbore 04a, and the outer end edge is connected to the second external transition boss 141 of the third shielding cover 14. The middle of the outer end provides an external mounting interface (non-penetrating threaded hole) for the optical 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 first-layer mounting holes 09a and third-layer transition holes 09b, and the third-layer shielding cover 14 is provided with third-layer mounting holes 14b at positions corresponding to the third-layer lower mounting holes 04c, which are respectively used to correspondingly install 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, 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, and the third-layer shielding cover 13 is provided with mounting holes corresponding to the third-layer upper mounting holes 04g, which are respectively used to correspondingly install 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 respectively corresponding to the first-layer lower mounting holes 04b, and a plurality of third-layer lower mounting bosses 043 respectively corresponding to the third-layer lower mounting holes 04c; the upper surface of the first-layer lower shielding cover 09 is provided with a plurality of third-layer lower transition bosses 092 correspondingly sleeved on 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 respectively corresponding to the third-layer upper mounting holes 04g. The first-layer lower mounting holes 04b and the third-layer lower mounting holes 04c are located on the same circumference and are staggered; the first-layer upper mounting holes 04f and the third-layer upper mounting holes 04g are located on the same circumference and are staggered.

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

[0097] refer to Figure 4 , Figure 5 , Figure 6 , Fig.10 , design for magnetic path breakpoints, as follows:

[0098] The first layer lower shielding cover 09 is mounted on the first layer lower mounting boss 042 by means of magnetic conductive screws 16; the third layer shielding cover 14 is mounted on the third layer lower mounting boss 043 by means of magnetic conductive screws 16. The first layer upper shielding cover 08 is mounted in the first layer upper mounting hole 04f on the annular lifting boss 047 by means of magnetic conductive screws 16; the third layer shielding cover 13 is mounted on the third layer upper mounting boss 048 by means of magnetic conductive screws 16.

[0099] The manufacturing method of the embodiment of the present invention comprises the following specific steps:

[0100] S0, prepare the optical fiber ring 01, the Y waveguide 05, the coupler 06 and the temperature sensor 07; prepare the shielding frame 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 sleeve 15;

[0101] S1, fix the third layer shielding sleeve 15 on the external mounting countersunk hole 04a of the base 04 by interference fit;

[0102] S2, glue and fix the optical fiber ring 01 in the mounting ring groove of the shielding frame 02; lead the pigtail of the optical fiber ring 01 out of the mounting ring groove, and laser weld and fix the shielding bottom cover 03 on the notch of the mounting ring groove; install the shielding frame 02 on the base 04 by screws;

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

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

[0105] Pass the wire of the temperature sensor 07 through the temperature sensor wire hole 04d on the base 04 to one side of the Y waveguide 05 and the coupler 06 for easy wiring;

[0106] S4, pass the wire of the temperature sensor 07 through the first wire hole 09d to pass through the first lower shielding cover 09, and pass the pigtail of the coupler 06 through the first fiber outlet hole 09e to pass through the first lower shielding cover 09;

[0107] Put the first layer lower shielding cover 09 on the supporting ring platform, and clamp the first layer upper shielding cover 08 in the supporting ring groove; install the first layer lower shielding cover 09 and the first layer upper shielding cover 08 on the base 04 respectively through the magnetic conductive screws 16;

[0108] S5, wrap the second upper shielding cover 10, the second shielding tube 11 and the second lower shielding cover 12 around the outer sides of the first upper shielding cover 08, the shielding frame 02 and the first lower shielding cover 09;

[0109] S6, pass the wire of the temperature sensor 07 through the second wire hole 14c to pass out of the third shielding cover 14, and pass the pigtail of the coupler 06 through the second fiber outlet hole 14d to pass out of the third shielding cover 14;

[0110] The third shielding cover 13 and the third shielding cover 14 are covered on the outer sides of the second upper shielding cover 10, the second shielding tube 11 and the second lower shielding cover 12; the third shielding cover 13 and the third shielding cover 14 are respectively installed on the base 04 by means of magnetic conductive screws 16;

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

[0112] When the performance is unqualified (e.g., out of tolerance), the optical fiber ring module is repaired, and then step S7 is performed again;

[0113] When the performance is qualified, the third shielding cover 13 and the third shielding cap 14 are fixedly connected by laser welding to complete the production of the optical fiber ring module.

[0114] The above content is only an embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. An optical fiber ring module with high magnetic shielding performance, comprising a base (04), a shielding frame (02) mounted on the base (04), and a shielding bottom cover (03); characterized in that: The shielding frame (02) has a mounting groove at the lower end, and a fiber ring (01) is arranged in the mounting groove. The shielding bottom cover (03) is arranged on the notch of the mounting groove and is used to cooperate with the mounting groove to perform basic magnetic shielding on the fiber ring (01). The base (04) is equipped with a Y waveguide (05), a coupler (06) and a temperature sensor (07). The two pigtails of the fiber ring (01) are respectively connected to the two pigtails at one end of the Y waveguide (05), and a pigtail at the other end of the Y waveguide (05) is connected to the pigtail of the coupler (06). A support ring groove is provided at the upper end of the shielding frame (02); a support ring platform is provided on the lower surface of the shielding bottom cover (03); a first-layer upper shielding cover (08) is embedded in the support ring groove, and a first-layer lower shielding cover (09) is mounted on the support ring platform. The first-layer upper shielding cover (08) and the first-layer lower shielding cover (09) are used to realize a first-layer full magnetic shielding; The upper surfaces of the shielding frame (02) and the first upper shielding cover (08) are provided with a second upper shielding cover (10); the outer peripheral surfaces of the shielding frame (02) and the first lower shielding cover (09) are sleeved with a second shielding cylinder (11); the lower surface of the first lower shielding cover (09) is provided with a second lower shielding cover (12); the second upper shielding cover (10), the second shielding cylinder (11) and the second lower shielding cover (12) are respectively connected correspondingly to realize a second layer of full magnetic shielding; The second-layer upper shielding cover (10) and the second-layer shielding cylinder (11) are sleeved with a third-layer shielding cover (13) with an opening at the lower end; the lower end of the third-layer shielding cover (13) is provided with a third-layer shielding cover (14); the lower surface of the base (04) is provided with at least three external mounting bosses (041); the first-layer lower shielding cover (09) is provided with a first external transition hole (09c) at a corresponding position, and the third-layer shielding cover (14) is provided with a second external transition hole (14a) at a corresponding position; the external mounting bosses (041) pass through the first external transition hole (09c), the second-layer lower shielding cover (12) and the second external transition hole (14a) respectively; the lower end of the external mounting bosses (041) is provided with a third-layer shielding sleeve (15); the third-layer shielding cover (13), the third-layer shielding cover (14) and the third-layer shielding sleeve (15) are respectively connected to achieve a third-layer full magnetic shielding; The first layer of lower shielding cover (09) is provided with a first wire hole (09d) and a first fiber outlet hole (09e), and the third layer of shielding cover (14) is provided with a second wire hole (14c) and a second fiber outlet hole (14d), which are used to lead out the wire of the temperature sensor (07) and the pigtail of the Y waveguide (05) and the coupler (06), respectively; 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 materials for shielding interference from low-frequency magnetic fields; the second layer upper shielding cover (10), the second layer shielding tube (11) and the second layer lower shielding cover (12) are made of conductive materials for shielding interference from high-frequency magnetic fields.

2. The optical fiber ring module with high magnetic shielding performance according to claim 1, characterized in that: A support ring plate (091) is provided on the outer edge of the upper surface of the first layer lower shielding cover (09), and the support ring plate (091) is oriented upward and is sleeved on the support ring platform; The upper surface of the first layer lower shielding cover (09) is provided with a plurality of first external transition bosses (093) respectively corresponding to the first external transition holes (09c), and the first external transition bosses (093) are directed upward and are correspondingly sleeved on the external mounting bosses (041); The lower surface of the third shielding cover (14) is provided with a plurality of second external transition bosses (141) respectively corresponding to the second external transition holes (14a), the second external transition bosses (141) are oriented downward and are correspondingly sleeved on the external mounting bosses (041), and the lower ends of the second external transition bosses (141) are connected to the corresponding third shielding sleeves (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 platform and the first external transition boss (093) constitutes a fiber winding area (A), and the fiber winding area (A) is used to wind the fiber ring (01), the Y waveguide (05) and the pigtail of the coupler (06).

3. The optical fiber ring module with high magnetic shielding performance according to claim 2, characterized in that: The external mounting boss (041) is provided with an external mounting countersunk hole (04a), the inner end of the third layer shielding sleeve (15) is embedded in the external mounting countersunk hole (04a), and the outer end edge is connected to the second external transition boss (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 a first-layer mounting hole (09a) and a third-layer transition hole (09b) correspondingly; the third-layer shielding cover (14) is provided with a third-layer mounting hole (14b) at a position corresponding to the third-layer lower mounting hole (04c), which is used to respectively install 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 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); the third-layer shielding cover (13) is provided with mounting holes corresponding to the third-layer upper mounting holes (04g), which are used to respectively install the first-layer upper shielding cover (08) and the third-layer shielding cover (13).

4. The optical fiber ring module with high magnetic shielding performance according to claim 3, characterized in that: The lower surface of the base (04) is provided with a plurality of first-layer lower mounting bosses (042) respectively corresponding to the first-layer lower mounting holes (04b), and a plurality of third-layer lower mounting bosses (043) respectively corresponding to the third-layer lower mounting holes (04c); the upper surface of the first-layer lower shielding cover (09) is provided with a plurality of third-layer lower transition bosses (092) correspondingly sleeved on 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 hole (04f) and the third-layer upper mounting hole (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) respectively corresponding to the third-layer upper mounting holes (04g); The third layer lower transition boss (092) is used to reduce the range of magnetic leakage; The first layer lower shielding cover (09) is mounted on the first layer lower mounting boss (042) via magnetic conductive screws (16); the third layer shielding cover (14) is mounted on the third layer lower mounting boss (043) via magnetic conductive screws (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 magnetic screws (16); the third-layer shielding cover (13) is installed on the third-layer upper mounting boss (048) through magnetic screws (16).

5. The optical fiber ring module with high magnetic shielding performance according to claim 4, characterized in that: The first layer lower mounting holes (04b) and the third layer lower mounting holes (04c) are located on the same circumference and are staggered; 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. A fiber ring module with high magnetic shielding performance according to any one of claims 1 to 5, characterized in that: The center line connecting the first wire hole (09d) and the first fiber outlet hole (09e) is recorded as the first layer center line, and the center line connecting the second wire hole (14c) and the second fiber outlet hole (14d) is recorded as the third layer center line; the projections of the first layer center line and the third layer center line in the radial plane are cross-arranged.

7. The optical fiber ring module with high magnetic shielding performance according to claim 6, characterized in that: 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 both used to reduce the range of magnetic leakage.

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

9. The optical fiber ring module with high magnetic shielding performance according to claim 1, characterized in that: A fiber outlet slot (044) is provided at the center of the lower surface of the base (04), and a Y-waveguide mounting slot (045) and a coupler mounting slot (046) are respectively provided at two sides of the fiber outlet slot (044); The fiber outlet groove (044) is used to lead out the pigtail of the optical fiber ring (01); the Y waveguide (05) and the coupler (06) are respectively installed on the base (04) through the Y waveguide installation groove (045) and the coupler installation groove (046); A temperature sensor mounting groove (049) is provided at the center of the upper surface of the base (04), and a frame mounting hole (04e) is provided along the circumferential direction of the upper surface of the base (04) near the outer edge; The temperature sensor (07) is installed on the base (04) through the temperature sensor installation groove (049); a temperature sensor wire hole (04d) is provided in the Y-waveguide installation groove (045) for leading out the wire of the temperature sensor (07); A mounting ring plate that matches the position of the frame mounting hole (04e) is provided in the middle of the inner side wall of the shielding frame (02) and is used to mount the shielding frame (02) on the base (04); The optical fiber ring (01) is glued and fixed in the mounting ring groove, the shielding bottom cover (03) and the notch of the mounting ring groove are fixed by laser welding; and the third shielding cover (13) and the third shielding cover (14) are fixed by laser welding.

10. A method for manufacturing an optical fiber ring module with high magnetic shielding performance, used for manufacturing an optical fiber ring module with high magnetic shielding performance as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: S0, prepare an optical fiber ring (01), a Y waveguide (05), a coupler (06) and a temperature sensor (07); prepare a shielding frame (02), a shielding bottom cover (03), a base (04), a first layer upper shielding cover (08), a first layer lower shielding cover (09), a second layer upper shielding cover (10), a second layer shielding cylinder (11), a second layer lower shielding cover (12), a third layer shielding cover (13), a third layer shielding cover (14) and a third layer shielding sleeve (15); S1, fixing the third shielding sleeve (15) on the base (04); S2, fix the optical fiber ring (01) in the mounting ring groove of the shielding frame (02); lead the pigtail of the optical fiber ring (01) out of the mounting ring groove, and fix the shielding bottom cover (03) on the notch of the mounting ring groove; install the shielding frame (02) on the base (04); S3, installing the Y waveguide (05), the coupler (06) and the temperature sensor (07) on the base (04); The two pigtails of the optical fiber ring (01) are respectively fused with the two pigtails at one end of the Y waveguide (05), and a pigtail at the other end of the Y waveguide (05) is fused with the pigtail of the coupler (06), and each pigtail is coiled on the shielding bottom cover (03); S4, passing the wire of the temperature sensor (07) through the first wire hole (09d) and out of the first lower shielding cover (09), and passing the pigtail of the coupler (06) through the first fiber outlet hole (09e) and out of the first lower shielding cover (09); The first layer of lower shielding cover (09) is mounted on the support ring platform, and the first layer of upper shielding cover (08) is clamped in the support ring groove; S5, wrapping the second layer upper shielding cover (10), the second layer shielding cylinder (11) and the second layer lower shielding cover (12) on the outer side of the first layer upper shielding cover (08), the shielding frame (02) and the first layer lower shielding cover (09); S6, passing the wire of the temperature sensor (07) through the second wire hole (14c) and out of the third shielding cover (14), and passing the pigtail of the coupler (06) through the second fiber outlet hole (14d) and out of the third shielding cover (14); The third shielding cover (13) and the third shielding cover (14) are wrapped around the outer sides of the second upper shielding cover (10), the second shielding cylinder (11) and the second lower shielding cover (12); S7, test the performance of the fiber ring module at this time and determine: When the performance is unqualified, the optical fiber ring module is repaired and then step S7 is performed again; When the performance is qualified, the third shielding cover (13) and the third shielding cap (14) are fixedly connected to complete the production of the optical fiber ring module.

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