CN214149334U - Fiber-optic gyroscope with double-layer magnetic shielding structure - Google Patents

Abstract

The application relates to a fiber-optic gyroscope with a double-layer magnetic shielding structure, which relates to the technical field of inertial measurement and comprises a fiber-optic ring, a first shielding cover and a second shielding cover, wherein the first shielding cover comprises a first lower cover body, a first non-magnetic conduction layer and a first upper cover body; the first upper cover body is pressed on the first non-magnetic conductive layer and connected with the first lower cover body, and gaps are reserved between the first upper cover body and the top end and the side face of the optical fiber ring; the second shielding cover is arranged outside the first shielding cover and is connected with the first shielding cover. This application is separated optic fibre ring and first cover body through first magnetic conduction layer not, prevents that optic fibre ring and first cover body contact from producing magnetic short circuit phenomenon down.

Description

Fiber-optic gyroscope with double-layer magnetic shielding structure

Technical Field

The application relates to the technical field of inertial measurement, in particular to a fiber-optic gyroscope with a double-layer magnetic shielding structure.

Background

The high-precision fiber-optic gyroscope is sensitive to a magnetic field due to the influence of the Faraday effect on the fiber-optic coil, and the performance parameters such as zero offset, drift and the like of the fiber-optic gyroscope are deteriorated due to the influence of the magnetic field. For the fiber-optic gyroscope without any measures, the zero bias sensitivity is 104 (degree)/(h.T) magnitude, the requirement of a common low-precision inertial measurement system can be met, but for the high-precision inertial measurement system, the zero bias sensitivity of the fiber-optic gyroscope is required to be 1-10 (degree)/(h.T). Therefore, the error caused by gyro drift due to the magnetic field is reduced by the magnetic shielding design, and the magnetic field source of the fiber optic gyro is mainly the earth magnetic field and the electromagnetic field generated by the electronic device. The magnetic shielding material provides a low-reluctance magnetic circuit in a magnetic field, and leads magnetic lines of force to pass through the magnetic shielding material, so that the magnetic field avoids sensitive components.

In the related art, the fiber optic gyroscope adopting the double-layer magnetic shielding comprises an upper shell, a lower shell, an upper tray, a lower tray, a fiber coil, a pressure ring and a base tray. The inner layer magnetic shielding protection of the optical fiber coil is realized through the upper tray and the lower tray, the C-shaped groove in the lower tray is used for supporting the optical fiber coil, the optical fiber coil is fixed on the bottom surface of the inner side of the C-shaped groove in the lower tray in a bonding mode, the upper tray and the lower tray are provided with inner flanges, and screw mounting holes are machined in the inner flanges and serve as mounting references to be fixed on the base tray through screws.

Because the optical fiber coil is fixed on the bottom surface of the inner side of the C-shaped groove of the lower tray in a bonding mode, the bonding uniformity between the optical fiber coil and the lower tray and the thickness of the viscose cannot be ensured, and the optical fiber coil and the lower tray cannot be completely isolated, so that the magnetic short circuit phenomenon is caused; moreover, because the screw hole needs to be opened on the base tray, when the dynamic load is born by threaded connection, the base tray needs to be made of a material with certain rigidity and toughness, and a metal material needs to be selected for the base tray, so that the fiber-optic gyroscope cannot achieve a complete double-layer magnetic shielding effect.

Disclosure of Invention

The embodiment of the application provides a fiber-optic gyroscope with double-deck magnetic shielding structure to fiber-optic coil fixes on tray down through the mode that bonds among the solution correlation technique, can't keep apart fiber-optic coil and tray down completely, leads to the problem of the emergence of magnetism short circuit phenomenon.

In a first aspect, a fiber optic gyroscope with a double-layer magnetic shielding structure is provided, which includes:

an optical fiber loop;

a first shield can, comprising:

-a first lower shell;

-a first magnetically non-conductive layer provided on the first lower enclosure, and a bottom end of the fiber ring is connected to the first lower enclosure through the first magnetically non-conductive layer;

a first upper cap, which is pressed on the first non-magnetic conductive layer and connected to the first lower cap, and has a gap with the top end and the side surface of the optical fiber ring;

and the second shielding cover is covered outside the first shielding cover and is connected with the first shielding cover.

In some embodiments:

the fiber-optic gyroscope also comprises two second non-magnetic conductive layers;

the second shielding cover comprises a second upper cover body and a second lower cover body which are mutually butted and connected, and the second upper cover body and the second lower cover body are respectively connected with the first upper cover body and the first lower cover body through two second non-magnetic conductive layers.

In some embodiments:

the second lower cover body is annular, and the inner ring and the outer ring of the second lower cover body are respectively provided with a first boss and a second boss which are upwards protruded along the circumferential direction;

the second non-magnetic conductive layer comprises a first gasket and a second gasket, the first gasket is arranged along the outer circumferential direction of the first boss, and the second gasket is arranged along the inner circumferential direction of the second boss; a first clamping space is formed between the first gasket and the second gasket;

the first lower cover body is annular and is clamped in the first clamping space, so that the first lower cover body is not contacted with the second lower cover body.

In some embodiments:

the bottom end of the first gasket is provided with a first bearing platform in an outward convex mode along the outer circumferential direction;

the bottom end of the second gasket is provided with a second bearing platform in an inward convex mode along the inner circumferential direction; the first clamping space is formed between the second bearing table and the first bearing table.

In some embodiments:

the second upper cover body is annular, and the inner ring and the outer ring of the second upper cover body are respectively provided with a third boss and a fourth boss in a downward protruding mode along the circumferential direction;

the second non-magnetic conductive layer comprises a third gasket and a fourth gasket, the third gasket is arranged along the outer circumferential direction of the third boss, and the fourth gasket is arranged along the inner circumferential direction of the fourth boss; a second clamping space is formed between the third gasket and the fourth gasket;

the first upper cover body is annular and is clamped in the second clamping space, so that the first upper cover body is not contacted with the second upper cover body.

In some embodiments:

the second boss and the fourth boss are connected through a tongue-and-groove structure;

the first boss and the third boss are both inwards convexly arranged along the circumferential direction to form butt joint surfaces, and the butt joint surfaces are bonded or welded.

In some embodiments:

the distance between the top end of the first upper cover body and the top end of the second upper cover body is equal to the distance between the bottom end of the first lower cover body and the bottom end of the second lower cover body; and/or a gap between the first upper cover body and the top end of the optical fiber ring is equal to the thickness of the first non-magnetic conductive layer.

In some embodiments:

the first lower cover body is annular, and the inner ring and the outer ring of the first lower cover body are respectively provided with a first resisting platform and a second resisting platform in an upward protruding mode along the circumferential direction;

the first non-magnetic conductive layer is annular and is arranged between the first retaining platform and the second retaining platform.

In some embodiments:

the first upper cover body is annular, and the inner ring and the outer ring of the first upper cover body are respectively provided with a third resisting platform and a fourth resisting platform in a downward protruding mode along the circumferential direction;

the diameter of the fourth stopping table is smaller than that of the second stopping table, the diameter of the third stopping table is larger than that of the first stopping table, the outer wall of the fourth stopping table is connected with the inner wall of the second stopping table, and the inner wall of the third stopping table is connected with the outer wall of the first stopping table.

In a second aspect, there is provided a fiber optic gyroscope comprising:

an optical fiber loop;

a first shield can, comprising:

-a first lower shell;

-a first magnetically non-conductive layer provided on the first lower enclosure, and a bottom end of the fiber ring is connected to the first lower enclosure through the first magnetically non-conductive layer;

the first upper cover body is pressed on the first non-magnetic conductive layer and connected with the first lower cover body, and gaps are reserved between the first upper cover body and the top end and the side face of the optical fiber ring.

The beneficial effect that technical scheme that this application provided brought includes: according to the embodiment of the application, the optical fiber ring is isolated from the first lower cover body through the first non-magnetic conductive layer, so that the phenomenon of magnetic short circuit caused by contact between the optical fiber ring and the first lower cover body is prevented; the first upper cover body is not contacted with the top end and the side face of the optical fiber ring, and a gap is reserved between the first upper cover body and the top end and the side face of the optical fiber ring; and this application embodiment adopts double-deck magnetic screen structure, compares the thickness that improves the magnetic screen layer, can improve magnetic screen efficiency more effectively.

The embodiment of the application provides an optical fiber gyroscope with double-deck magnetic shielding structure, because this application embodiment is kept apart optical fiber ring and first cover body through first magnetic conduction layer, and the first upper shield body all does not contact with the top and the side of optical fiber ring, and leaves the space, consequently, this application embodiment can prevent that optical fiber ring and first cover body contact from producing the magnetic short circuit phenomenon to and all keep apart the first cover body and the first upper shield body of first shield cover with the optical fiber ring, prevent the production of magnetic short circuit phenomenon.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a perspective view of a fiber-optic gyroscope with a double-layer magnetic shielding structure provided in an embodiment of the present application;

FIG. 2 is an exploded view of a fiber optic gyroscope with a double-layer magnetic shielding structure according to an embodiment of the present application;

FIG. 3 is a cross-sectional view of FIG. 1;

fig. 4 is a full sectional view of fig. 1.

In the figure: 1. an optical fiber loop; 2. a first shield case; 20. a first lower cover body; 200. a first abutment stage; 201. a second abutment stage; 21. a first magnetically non-conductive layer; 22. a first upper cover body; 220. a third abutment stage; 221. a fourth abutment table; 3. a second shield case; 30. a second upper cover body; 300. a third boss; 301. a fourth boss; 31. a second lower cover body; 310. a first boss; 311. a second boss; 312. a butt joint surface; 4. a second magnetically non-conductive layer; 40. a first gasket; 400. a first receiving table; 41. a second gasket; 410. a second receiving table; 42. a third gasket; 43. a fourth gasket; 44. a first holding space; 45. a second holding space.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Example 1:

referring to fig. 1 and 2, embodiment 1 of the present application provides a fiber-optic gyroscope with a double-layer magnetic shielding structure, which includes a fiber-optic ring 1, a first shielding case 2 and a second shielding case 3, where the first shielding case 2 is covered outside the fiber-optic ring 1, and the second shielding case 3 is covered outside the first shielding case 2 and connected to the first shielding case 2, so as to form the fiber-optic gyroscope with the double-layer shielding structure. The first shielding case 2 comprises a first lower cover body 20, a first non-magnetic layer 21 and a first upper cover body 22, the first non-magnetic layer 21 is arranged on the first lower cover body 20, and the bottom end of the optical fiber ring 1 is connected to the first lower cover body 20 through the first non-magnetic layer 21; the first upper cover 22 is pressed on the first non-magnetic conductive layer 21 and connected with the first lower cover 20, and gaps are left between the first upper cover 22 and the top end and the side surface of the optical fiber ring 1.

The diameter of the first lower cover body 20 in embodiment 1 of this application is greater than the diameter of first non-magnetic conductive layer 21, and the diameter of first non-magnetic conductive layer 21 is greater than the diameter of optical fiber ring 1, and the diameter of the first upper cover body 22 is greater than the diameter of optical fiber ring 1, and the thickness of the first upper cover body 22 along the vertical direction is greater than the thickness of optical fiber ring 1. The first upper cover body 22 is connected with the first lower cover body 20 to form an inner-layer shielding space, the optical fiber ring 1 is connected to the first non-magnetic conductive layer 21 through non-conductive glue, the first non-magnetic conductive layer 21 is connected to the first lower cover body 20 through non-conductive glue, the non-conductive glue is usually non-magnetic, and the magnetic protection effect is enhanced; then, the first upper cover 22 presses and holds the first non-magnetic layer 21, so that the first non-magnetic layer 21 is tightly connected with the first lower cover 20, and the first non-magnetic layer 21 is prevented from moving in the shielding space, so that the optical fiber ring 1 moves along with the first non-magnetic layer.

In embodiment 1 of the present application, the optical fiber ring 1 is isolated from the first lower cover 20 by the first non-magnetic conductive layer 21, so as to prevent the optical fiber ring 1 from contacting with the first lower cover 20 to generate a magnetic short circuit; the diameter of the first lower cover body 20 is greater than that of the optical fiber ring 1, and the thickness of the first upper cover body 22 in the vertical direction is greater than that of the optical fiber ring 1, so that the first upper cover body 22 is not in contact with the top end and the side surface of the optical fiber ring 1, and a gap is left, the first upper cover body 22 is only in contact with the first non-magnetic conductive layer 21, is connected with the first upper cover body 22, and forms the first shielding cover 2, so that the first lower cover body 20 and the first upper cover body 22 of the first shielding cover 2 are both isolated from the optical fiber ring 1, and the magnetic short circuit phenomenon is prevented; and this application embodiment 1 adopts double-deck magnetic screen structure, compares the thickness that improves the magnetic screen layer, can improve magnetic screen efficiency more effectively.

Referring to fig. 2 and 3, the fiber-optic gyroscope further includes two second magnetically impermeable layers 4; the second shielding case 3 includes a second upper cover 30 and a second lower cover 31 that are butted and connected to each other, and the second upper cover 30 and the second lower cover 31 are connected to the first upper cover 22 and the first lower cover 20 through two second non-magnetic layers 4, respectively.

The first shielding case 2 and the second shielding case 3 in embodiment 1 are isolated by two second non-magnetic conductive layers 4, so that complete double-layer magnetic shielding is realized, and optimization of magnetic protection performance can be realized.

Optionally, the first lower cover body 20 and the first upper cover body 22, and the second upper cover body 30 and the second lower cover body 31 in embodiment 1 of the present application are all made of an iron-nickel alloy material, and the first non-magnetic conductive layer 21 is made of an insulating non-magnetic conductive material, such as a ceramic material, a ceramic-based composite material, and a glass fiber reinforced plastic material; the second non-magnetic conductive layer 4 is made of ceramic matrix composite material. In addition, in order to reduce the alternating thermal stress, the first non-magnetic conductive layer 21 needs to be made of a ceramic matrix composite, and the difference between the linear expansion coefficients of the iron-nickel alloy material selected for the second upper cover 30 and the second lower cover 31 and the ceramic matrix composite material selected for the first non-magnetic conductive layer 21 is required to be less than 5%.

Preferably, as shown in fig. 4, the second lower cover 31 is annular, and the inner ring and the outer ring of the second lower cover 31 are respectively provided with a first boss 310 and a second boss 311 protruding upwards along the circumferential direction; the second non-magnetic conductive layer 4 includes a first gasket 40 and a second gasket 41, the first gasket 40 is disposed along an outer circumferential direction of the first boss 310, and the second gasket 41 is disposed along an inner circumferential direction of the second boss 311; and a first clamping space 44 is formed between the first gasket 40 and the second gasket 41; the first lower cover 20 is annular, and the first lower cover 20 is held in the first holding space 44, so that the first lower cover 20 is not in contact with the second lower cover 31.

In embodiment 1 of the present application, the inner ring of the first lower cover 20 is isolated from the first boss 310 by the first gasket 40, and the outer ring of the first lower cover 20 is isolated from the second boss 311 by the second gasket 41, so that the first lower cover 20 is completely isolated from the second lower cover 31, and a double-layer magnetic shielding effect is achieved.

Preferably, the bottom end of the first gasket 40 is provided with a first receiving platform 400 in an outward protruding manner along the outer circumference direction; the bottom end of the second gasket 41 is provided with a second receiving platform 410 which is inwards protruded along the inner circumference direction; the second receiving platform 410 and the first receiving platform 400 form a first holding space 44 therebetween.

In embodiment 1 of the present application, the first holding space 44 formed by the first receiving platform 400 and the second receiving platform 410 holds the first lower cover body 20, so that the bottom end and the side surface of the first lower cover body 20 are completely isolated from the second lower cover body 31.

Further, referring to fig. 4, the second upper cover 30 is annular, and the inner ring and the outer ring of the second upper cover 30 are respectively provided with a third boss 300 and a fourth boss 301 which are protruded downward along the circumferential direction; the second non-magnetic conductive layer 4 includes a third gasket 42 and a fourth gasket 43, the third gasket 42 is disposed along an outer circumferential direction of the third boss 300, and the fourth gasket 43 is disposed along an inner circumferential direction of the fourth boss 301; and a second holding space 45 is formed between the third gasket 42 and the fourth gasket 43; the first upper cover 22 is annular, and the first upper cover 22 is held in the second holding space 45, so that the first upper cover 22 does not contact with the second upper cover 30.

In embodiment 1 of the present application, the inner ring of the first upper cover 22 is isolated from the third boss 300 by the third gasket 42, and the outer ring of the first upper cover 22 is isolated from the fourth boss 301 by the fourth gasket 43, so that the first upper cover 22 is completely isolated from the second upper cover 30, and a double-layer magnetic shielding effect is achieved.

Preferably, the bottom end of the third gasket 42 is provided with a third receiving platform in a protruding manner along the outer circumference direction; the bottom end of the fourth gasket 43 is provided with a fourth receiving platform in an inward convex manner along the inner circumferential direction; a second clamping space 45 is formed between the third bearing table and the fourth bearing table.

In embodiment 1 of the present application, the first upper cover 22 is received by the second holding space 45 formed by the third receiving platform and the fourth receiving platform, so that the top end and the side surface of the first upper cover 22 are completely isolated from the second upper cover 30.

Furthermore, as shown in fig. 4, the second boss 311 and the fourth boss 301 are connected by a tongue-and-groove structure; the first boss 310 and the third boss 300 are both provided with an abutting surface 312 protruding inwards along the circumferential direction, and the two abutting surfaces 312 are bonded or welded.

When the two abutting surfaces 312 are jointed, the abutting surface between the second boss 311 and the fourth boss 301 keeps a distance of 0.5mm-1mm, so that the third gasket 42 and the fourth gasket 43 can be guaranteed to compact the first upper cover 22 while the adhesion or welding of the two abutting surfaces 312 is not influenced, and meanwhile, the gap area can be subjected to post-treatment through glue supplement.

When the two butt joint surfaces 312 are welded, the annular flaky brazing filler metal is placed at the two butt joint surfaces 312, high-energy beam welding is performed between the inner ring and the outer ring of the annular flaky brazing filler metal and in the direction perpendicular to the installation surface by controlling high-energy beam equipment to surround the ring, and a high-energy beam-brazing composite welding joint is formed. The effective connection of the second upper cover body 30 and the second lower cover body 31 can be realized by effectively utilizing the structural characteristics, the welding direction is 90 degrees with the direction of the optical fiber ring 1, the heat action can be reduced, and the magnetic shielding is not influenced by the weld defects; the brazing area can increase the fixed connection area and enhance the strength of the external joint.

When the second boss 311 and the fourth boss 301 are welded, high-energy beam welding is performed using a high-energy beam apparatus at the center of the joint surface between the second boss 311 and the fourth boss 301, thereby forming a high-energy beam weld. After welding, the connection of the second boss 311 and the fourth boss 301 and the connection of the two abutting surfaces 312 connect the first shield shell 2 and the second shield shell 3 into a hermetically sealed whole.

Optionally, the distance between the top end of the first upper cover 22 and the top end of the second upper cover 30 is equal to the distance between the bottom end of the first lower cover 20 and the bottom end of the second lower cover 31. And the gap between the first upper cover 22 and the top end of the optical fiber ring 1 is equal to the thickness of the first non-magnetic conductive layer 21.

The thicknesses of the first upper cover body 22, the second upper cover body 30 and the second lower cover body 31 are all 1-1.5mm, and after the assembling, the distance between the top end of the first upper cover body 22 and the top end of the second upper cover body 30 is equal to the distance between the bottom end of the first lower cover body 20 and the bottom end of the second lower cover body 31 and is 1-1.5 mm. The thickness of the first magnetically impermeable layer 21 is 1.5mm-2 mm.

According to engineering experience, the design value of the size can ensure that the optical fiber gyroscope has the advantages of minimum size and lightest weight while meeting the magnetic protection requirement of the gyroscope on high precision.

Further, the first lower cover body 20 is annular, and a first stopping table 200 and a second stopping table 201 are respectively formed on the inner ring and the outer ring of the first lower cover body 20 in an upward protruding manner along the circumferential direction; the first non-magnetic layer 21 is annular, and the first non-magnetic layer 21 is disposed between the first abutting stage 200 and the second abutting stage 201.

The first non-magnetic conductive layer 21 is annular, the basic values of the outer diameter and the inner diameter of the annular shape are respectively equal to the basic values of the outer diameter and the inner diameter of the first lower cover body 20, and the first non-magnetic conductive layer 21 can be embedded into the first lower cover body 20 in a transition fit manner through tolerance control. The magnetic conductivity of the first non-magnetic conductive layer 21 is selected to be close to 1, so that the sizes of the magnetic shielding cavities around the optical fiber ring 1 are consistent, and the maximum space utilization rate is realized.

Furthermore, the first upper cover 22 is annular, and the inner ring and the outer ring of the first upper cover 22 are respectively provided with a third abutment 220 and a fourth abutment 221 which are protruded downwards along the circumferential direction; the diameter of the fourth stopping table 221 is smaller than that of the second stopping table 201, the diameter of the third stopping table 220 is larger than that of the first stopping table 200, the outer wall of the fourth stopping table 221 is connected with the inner wall of the second stopping table 201, and the inner wall of the third stopping table 220 is connected with the outer wall of the first stopping table 200.

The base value of the outer diameter of the first upper cover 22 is equal to the base value of the inner diameter of the first lower cover 20, and the first upper cover 22 can be inserted into the first lower cover 20 in a transition fit manner through tolerance control. During assembly, the combination of the optical fiber ring 1, the first non-magnetic layer 21 and the first lower cover body 20 is placed on a workbench, brazing filler metal is placed in advance at the joint of the first upper cover body 22 and the first lower cover body 20, the open end of the first upper cover body 22 is inserted into the first lower cover body 20, the end face of the open end of the first upper cover body 22 is compacted on the surface of the first non-magnetic layer 21, and soft soldering is carried out at the joint of the first upper cover body 22 and the first lower cover body 20; alternatively, the joint between the first upper cover 22 and the first lower cover 20 may be connected by an adhesive process without placing solder. Alternatively, the joint between the first upper shell 22 and the first lower shell 20 is welded by high energy beam.

The assembly mode greatly enhances the fixed connection rigidity of the optical fiber ring, and prevents the gyro measurement deviation caused by structure shaking. The influence of the welding seam on the shielding performance of the first shielding case 2 can be avoided by using soft soldering; if high energy beam welding is used, the thickness of the joint of the first upper cover 22 and the first lower cover 20 is ensured to be higher than the depth of the weld, so as to avoid the defect of penetrating weld to affect the magnetic shielding.

Example 2:

the embodiment 2 of the present application provides an optical fiber gyroscope, which includes an optical fiber ring 1 and a first shielding case 2, where the first shielding case 2 is covered outside the optical fiber ring 1, the first shielding case 2 includes a first lower cover body 20, a first non-magnetic conductive layer 21 and a first upper cover body 22, the first non-magnetic conductive layer 21 is disposed on the first lower cover body 20, and a bottom end of the optical fiber ring 1 is connected to the first lower cover body 20 through the first non-magnetic conductive layer 21; the first upper cover 22 is pressed on the first non-magnetic conductive layer 21 and connected with the first lower cover 20, and gaps are left between the first upper cover 22 and the top end and the side surface of the optical fiber ring 1.

In embodiment 2 of the present application, the optical fiber ring 1 is isolated from the first lower cover 20 by the first non-magnetic conductive layer 21, so as to prevent the optical fiber ring 1 from contacting with the first lower cover 20 to generate a magnetic short circuit; and because the diameter of the first lower cover body 20 is greater than the diameter of the optical fiber ring 1, and the thickness of the first upper cover body 22 along the vertical direction is greater than the thickness of the optical fiber ring 1, the first upper cover body 22 is not in contact with the top end and the side surface of the optical fiber ring 1, and a gap is left, the first upper cover body 22 is only in contact with the first non-magnetic conductive layer 21, is connected with the first upper cover body 22, and forms the first shielding cover 2, so that the first lower cover body 20 and the first upper cover body 22 of the first shielding cover 2 are isolated from the optical fiber ring 1, and the magnetic short circuit phenomenon is prevented.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A fiber-optic gyroscope with a double-layer magnetic shielding structure is characterized by comprising:

an optical fiber ring (1);

a first shielding cage (2) comprising:

-a first lower shell (20);

-a first non-magnetic conductive layer (21) provided on the first lower enclosure (20), and a bottom end of the fiber ring (1) is connected to the first lower enclosure (20) through the first non-magnetic conductive layer (21);

-a first upper cap (22) pressed against the first magnetically non-conductive layer (21) and connected to the first lower cap (20), the first upper cap (22) and the top and side of the optical fiber ring (1) being spaced apart;

and the second shielding cover (3) is covered outside the first shielding cover (2) and is connected with the first shielding cover (2).

2. The fiber optic gyroscope having a double-layer magnetic shield structure as claimed in claim 1, wherein:

the fiber-optic gyroscope also comprises two second non-magnetic conductive layers (4);

the second shielding case (3) comprises a second upper cover body (30) and a second lower cover body (31) which are mutually butted and connected, wherein the second upper cover body (30) and the second lower cover body (31) are respectively connected with the first upper cover body (22) and the first lower cover body (20) through two second non-magnetic conductive layers (4).

3. The fiber optic gyroscope having a double-layer magnetic shield structure as claimed in claim 2, wherein:

the second lower cover body (31) is annular, and a first boss (310) and a second boss (311) are formed by upward protruding inner and outer rings of the second lower cover body (31) along the circumferential direction respectively;

the second non-magnetic conductive layer (4) includes a first gasket (40) and a second gasket (41), the first gasket (40) is disposed along an outer circumferential direction of the first boss (310), and the second gasket (41) is disposed along an inner circumferential direction of the second boss (311); a first clamping space (44) is formed between the first gasket (40) and the second gasket (41);

the first lower cover body (20) is annular, and the first lower cover body (20) is clamped in the first clamping space (44) so that the first lower cover body (20) is not contacted with the second lower cover body (31).

4. The fiber optic gyroscope having a double-layer magnetic shield structure of claim 3, wherein:

the bottom end of the first gasket (40) is provided with a first bearing platform (400) in an outward convex mode along the outer circumferential direction;

the bottom end of the second gasket (41) is provided with a second bearing platform (410) in an inward convex mode along the inner circumferential direction; the second receiving platform (410) and the first receiving platform (400) form the first clamping space (44) therebetween.

5. The fiber optic gyroscope having a double-layer magnetic shield structure of claim 3, wherein:

the second upper cover body (30) is annular, and a third boss (300) and a fourth boss (301) are respectively formed on the inner ring and the outer ring of the second upper cover body (30) in a downward protruding mode along the circumferential direction;

the second non-magnetic conductive layer (4) includes a third gasket (42) and a fourth gasket (43), the third gasket (42) is disposed along an outer circumferential direction of the third boss (300), and the fourth gasket (43) is disposed along an inner circumferential direction of the fourth boss (301); a second clamping space (45) is formed between the third gasket (42) and the fourth gasket (43);

the first upper cover body (22) is annular, and the first upper cover body (22) is clamped in the second clamping space (45) so that the first upper cover body (22) is not in contact with the second upper cover body (30).

6. The fiber optic gyroscope having a double-layer magnetic shield structure of claim 5, wherein:

the second boss (311) is connected with the fourth boss (301) through a tongue-and-groove structure;

the first boss (310) and the third boss (300) are both provided with butt joint surfaces (312) in an inward protruding mode along the circumferential direction, and the butt joint surfaces (312) are bonded or welded.

7. The fiber optic gyroscope having a double-layer magnetic shield structure as claimed in claim 1, wherein:

the distance between the top end of the first upper cover body (22) and the top end of the second upper cover body (30) is equal to the distance between the bottom end of the first lower cover body (20) and the bottom end of the second lower cover body (31); and/or the gap between the first upper cover body (22) and the top end of the optical fiber ring (1) is equal to the thickness of the first non-magnetic conductive layer (21).

8. The fiber optic gyroscope having a double-layer magnetic shield structure as claimed in claim 1, wherein:

the first lower cover body (20) is annular, and a first stopping table (200) and a second stopping table (201) are formed in an upward protruding mode of an inner ring and an outer ring of the first lower cover body (20) along the circumferential direction respectively;

the first non-magnetic conductive layer (21) is annular, and the first non-magnetic conductive layer (21) is arranged between the first resisting platform (200) and the second resisting platform (201).

9. The fiber optic gyroscope having a double-layer magnetic shield structure of claim 8, wherein:

the first upper cover body (22) is annular, and the inner ring and the outer ring of the first upper cover body (22) are respectively provided with a third resisting platform (220) and a fourth resisting platform (221) in a downward protruding mode along the circumferential direction;

the diameter of fourth keeps off platform (221) is less than the diameter of second keeps off platform (201), the diameter of third keeps off platform (220) is greater than the diameter of first keeping off platform (200), just the outer wall of fourth keep off platform (221) with the interior wall connection of second keeping off platform (201), the inner wall of third keep off platform (220) with the exterior wall connection of first keeping off platform (200).

10. A fiber optic gyroscope, comprising:

an optical fiber ring (1);

a first shielding cage (2) comprising:

-a first lower shell (20);

-a first non-magnetic conductive layer (21) provided on the first lower enclosure (20), and a bottom end of the fiber ring (1) is connected to the first lower enclosure (20) through the first non-magnetic conductive layer (21);

-a first upper cap (22) pressed against the first magnetically non-conductive layer (21) and connected to the first lower cap (20), wherein the first upper cap (22) and the top and side of the optical fiber ring (1) are spaced apart.

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