Micro-miniature optical fiber gyroscope capable of being installed in multiple forms

Abstract

The invention provides a micro-miniature optical fiber gyroscope capable of being installed in multiple forms. The micro-miniature optical fiber gyroscope comprises an upper cover, a layered seat, an adapter seat, an optical fiber ring, a shell, a bottom cover, a first heat conduction pad, a first supporting column, a light source driving circuit, a three-in-one photoelectric integrated module, a Y waveguide, an insulating spacer, a gyroscope control circuit, a second supporting column and a second heat conduction pad, the shell is divided into an upper part and a lower part, the upper part is mainly composed of an adapter, optical devices, a light source driving circuit and an upper cover, and the lower part is mainly composed of an optical fiber ring, a gyroscope control circuit and a bottom cover; through the structural modular design, the coiling manufacturability of the optical fiber is improved; by adopting a photoelectric integrated device, the miniaturization of the volume size of the gyroscope is realized; the temperature performance of the gyroscope is improved through heat insulation and heat dissipation design of optical devices and circuit components of a main heat source; through diversified design of the shell of the gyroscope, the gyroscope has the functions of magnetic shielding and multiple installation modes.

Description

Technical Field

[0001] The invention relates to a fiber optic gyroscope structure design technology, belonging to the technical field of fiber optic gyroscopes, and specifically to a micro fiber optic gyroscope capable of being installed in multiple forms. Background Art

[0002] As a new type of inertial navigation core component, fiber optic gyroscope has the characteristics of large dynamic range, long life, stable performance and low cost. It is widely used in aerospace, national defense weapons and other fields.

[0003] Especially in the application fields of missiles, ships and vehicles, which have developed rapidly in recent years, the demand for miniaturization of fiber optic gyroscopes has become more and more urgent. There is a need for a fiber optic gyroscope that can meet the accuracy requirements while also having the characteristics of simple structure, small size and excellent performance.

[0004] Since fiber optic gyroscopes are sensitive to magnetic fields and are easily affected by geomagnetic or other static magnetic fields, they require structural parts with magnetic shielding functions, as well as optical fibers with different functions, multiple optical devices, circuit boards, and related supporting structural parts. Therefore, in the field of fiber optic gyroscope structural design, due to the limitations of these factors, there is currently no fiber optic gyroscope structural solution that can simultaneously meet the above requirements and is small in size. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a micro-fiber gyroscope that can be installed in multiple forms. Through structural modular design, the processability of fiber optic winding is improved; through the use of optoelectronic integrated devices, the size of the gyroscope is miniaturized; through the insulation and heat dissipation design of optical devices and circuit components that are the main heat sources, the temperature performance of the gyroscope is improved; through the diversified design of the gyroscope housing, the gyroscope has the functions of magnetic shielding and multiple installation methods.

[0006] In order to achieve the above objectives, the present invention provides the following technical solutions:

[0007] A miniature fiber optic gyroscope capable of multiple installation forms comprises: an upper cover, a layered seat, an adapter seat, a fiber optic ring, an outer shell, a bottom cover, a first heat conductive pad, a first pillar, a light source driving circuit, a three-in-one optoelectronic integrated module, a Y waveguide, an insulating gasket, a gyroscope control circuit, a second pillar, and a second heat conductive pad; the outer shell is divided into an upper and lower part, the upper part is mainly composed of an adapter seat, various optical devices, a light source driving circuit and an upper cover, and the lower part is mainly composed of a fiber optic ring, a gyroscope control circuit and a bottom cover; the fiber optic ring is bonded to the adapter seat, and the fiber optic ring of the adapter seat is placed in the outer shell with the surface facing downward; the three-in-one optoelectronic integrated module is used as the main heat source to optimize the heat conductive environment, and the optical fiber ring ... Adhesive fixing; the Y waveguide is first fixed to the insulating gasket on the outside, and then the Y waveguide with the insulating gasket is adhesively fixed in the rectangular groove reserved in the adapter; the layered seat is mainly used to coil the non-sensitive optical fiber segment, which is stacked on the adapter and fixed with the first pillar. The first pillar fixes the layered seat and the adapter to the outer shell through the threaded hole; the light source driving circuit and the upper cover are stacked on the first pillar, and the first thermal pad is adhesively connected between the light source driving circuit and the upper cover; the cable of the Y waveguide is passed through the lower part of the outer shell, the gyroscope control circuit is connected to the lower part of the outer shell through the second pillar, the bottom cover is installed on the second pillar, and the second thermal pad is adhesively connected between the gyroscope control circuit and the bottom cover.

[0008] Furthermore, the adapter is used to fix the optical fiber ring, the three-in-one optoelectronic integrated module and the Y-waveguide. The optical fiber ring is bonded to the bottom surface, and a circular arc segment is provided in the bottom annular groove for the optical fiber to pass through. The upper surface has a square groove reserved for bonding the optoelectronic integrated module and a rectangular groove for bonding the Y-waveguide. A straight rib is provided on each side to constrain the coiled sensitive optical fiber. At the same time, a circular threading hole and two rectangular threading holes are provided in the central area of ​​the adapter.

[0009] The optical fiber ring is bonded to the annular groove at the bottom of the adapter by a special adhesive, wherein the bottom surface of the annular groove of the adapter is sandblasted to enhance the bonding effect of the ring and improve the mechanical properties of the gyroscope. The polarization-maintaining optical fiber passes through the arc segment hole in the adapter to the upper surface of the adapter.

[0010] The Y-waveguide is bonded to the rectangular groove of the adapter, and a gasket made of insulating material is added in the middle. A separate threading hole is set for the Y-waveguide pin cable, and the cable passes through this hole to the preset pad of the control circuit.

[0011] The housing is a hollow body with a circular inner circle and a square outer surface, and contains two upper and lower mounting surfaces. The upper mounting surface uses four first pillars to fix and bond the adapter of the optical fiber ring, and the lower mounting surface is used to fix the gyro control circuit board. The housing also includes an external mounting interface, and the gyroscope can be installed in various ways such as waist mounting and bottom mounting.

[0012] The layered seat is installed and fixed, and shares four pillars with the adapter seat, and is fixed to the outer shell. The layered seat is also provided with straight ribs around it, and non-sensitive optical fibers can be wound.

[0013] The light source driving circuit board is installed between the upper cover and the layered seat, the gyro control circuit board is installed on the lower mounting surface of the shell through the second support, and a heat conductive pad is arranged between the circuit board and the structural member to form a good heat dissipation path.

[0014] The upper cover is buckled on the upper part of the shell, and the bottom cover is buckled on the bottom of the shell, and both are fixed to the shell by laser welding, so that the gyroscope forms a complete magnetic conductor with good magnetic shielding performance.

[0015] Compared with the prior art, the method adopted by the present invention has the following advantages and beneficial effects:

[0016] 1. The present invention adopts a modular design to independently set the fiber ring and the winding area of ​​the sensitive fiber on the adapter seat, and uses a layered seat to distinguish the winding area of ​​the sensitive fiber and the non-sensitive fiber, thereby improving the assembly process of the gyroscope;

[0017] 2. The present invention adopts a three-in-one optoelectronic module, which reduces the number of steps for optical device and optical fiber fusion splicing, greatly reduces the size of the gyroscope, and improves assembly reliability;

[0018] 3. In the present invention, the raw materials of the housing, the upper cover and the bottom cover are all made of high magnetic permeability iron-nickel alloy, and they are welded by laser, so that the gyroscope forms a complete and closed magnetic conductor, reducing the influence of the external magnetic field on the gyroscope;

[0019] 4. The present invention uses thermal conductive glue or thermal conductive pads to dissipate heat at the main heat source locations. For example, the three-in-one optoelectronic module is bonded with thermal conductive glue, and thermal conductive pads are used to bond structural parts above the main heat-generating components of the light source driving circuit and the gyroscope control circuit, forming a good heat dissipation path.

[0020] 5. The present invention provides a wire threading hole and an optical fiber threading hole for the adapter, thereby distinguishing the optical fiber coiling and the circuit wire, making the gyroscope structure more compact and the assembly process more reasonable and convenient.

[0021] 6. The present invention uses pillars to make the connection between the adapter, the layered seat, the housing and other structural parts more stable, and further reduce the volume of the gyroscope. Different housing mounting ear forms are designed so that the gyroscope can be personalized according to different usage environment requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The three installation forms of the miniature fiber optic gyroscope of the present invention are shown in FIG.

[0023] Figure 2 A schematic diagram of a miniature fiber optic gyroscope that can be installed in multiple forms according to the present invention;.

[0024] Figure 3 A cross-sectional view of a micro-sized fiber optic gyroscope that can be installed in multiple forms according to the present invention;

[0025] Figure 4 It is a schematic diagram of the installation of an adapter and an optical fiber ring of a micro-sized optical fiber gyroscope capable of multiple installation forms according to the present invention;

[0026] Figure 5 This is a schematic diagram of the installation of an adapter, an optical device and a housing of a miniature fiber optic gyroscope that can be installed in multiple forms according to the present invention;

[0027] Figure 6 It is a schematic diagram of the installation of a layered seat of a micro-sized fiber optic gyroscope that can be installed in multiple forms according to the present invention;

[0028] Figure 7 A schematic diagram of the housing structure of a miniature fiber optic gyroscope that can be installed in multiple forms according to the present invention;

[0029] Figure 8 The present invention is a schematic diagram of the structure of an adapter seat for a micro-fiber gyroscope that can be installed in multiple forms. DETAILED DESCRIPTION

[0030] The present invention will be further described below by describing a preferred embodiment in detail in conjunction with the accompanying drawings.

[0031] like Figure 1 As shown, the present invention has three installation forms for a micro-sized fiber optic gyroscope that can be installed in multiple forms, namely, bottom reverse installation, waist normal installation, and bottom normal installation. The corresponding gyroscope housing structures will be slightly different, which can be easily installed and adapted to different usage occasions for flexible selection. In the following detailed description, each part of the gyroscope structure in the bottom reverse installation form is described.

[0032] like Figure 2 As shown, a micro-sized fiber optic gyroscope that can be installed in multiple forms includes an upper cover 1, a layered seat 2, an adapter seat 3, a fiber optic ring 4, a shell 5, a bottom cover 6, a first thermal pad 7, a first pillar 8, a light source driving circuit 9, a three-in-one optoelectronic integrated module 10, a Y waveguide 11, an insulating gasket 12, a gyroscope control circuit 13, a second pillar 14, and a second thermal pad 15.

[0033] like Figure 3 As shown, the gyroscope can be divided into two parts according to the housing 5, the upper part is mainly composed of the adapter 3, various optical devices, the light source driving circuit 9 and the upper cover 1, and the lower part is mainly composed of the optical fiber ring 4, the gyroscope control circuit 13 and the bottom cover 6.

[0034] like Figure 4 As shown, the optical fiber ring 4 is bonded to the adapter seat 3 by epoxy glue, and the polarization-maintaining optical fiber passes through its optical fiber perforation 301 to the other side of the adapter seat 3. The polarization-maintaining optical fiber of the perforated section needs to be protected by a sleeve, and the optical fiber perforation 301 is fixed by glue. After the adhesive is cured, the optical fiber ring 4 of the adapter seat 3 is placed face down into the housing 5.

[0035] like Figure 5 As shown, after the adapter 3 is placed in the housing 5, the three-in-one optoelectronic integrated module 10 and the Y-waveguide 11 are installed, wherein the three-in-one optoelectronic integrated module 10 is bonded and fixed with a special thermal conductive adhesive. As the main heat source, the device needs to optimize the thermal conductive environment. The Y-waveguide 11 is first bonded and fixed with the insulating gasket 12 on the outside, and then the Y-waveguide 11 with the gasket is bonded and fixed in the rectangular groove reserved in the adapter 3 with epoxy glue. Therefore, the sensitive optical fiber segment is bounded by four straight ribs and coiled on the adapter 3 to prevent it from being affected during the assembly process. In addition, the adapter 3 reserves a Y-waveguide cable port 302, which can be passed through the housing 5 to the lower part of the gyroscope to the gyroscope control circuit 13.

[0036] like Figure 6 As shown, the layered seat 2 is stacked on the adapter seat 3 and fixed by four first pillars 8. The function of the layered seat 2 is mainly used to coil the non-sensitive optical fiber segment. The purpose of such partitioning is to reduce the impact on the sensitive optical fiber segment and improve the optical assembly process of the gyroscope. There are also four straight ribs 201 for limiting the position of the optical fiber. The four first pillars 8 fix the layered seat 2 and the adapter seat 3 to the housing 5 through threaded holes.

[0037] like Figure 7 As shown, four first pillars 8 are screwed into the threaded holes 501 on the upper part of the shell 5, the adapter is installed on the plane 502, and the optical fiber ring 4 is located in the inner cavity 503. A threaded hole is set on the upper end of the first pillar 8, and the light source driving circuit 9 and the upper cover 1 are stacked on the first pillar 8 and fastened by screws. In addition, the first thermal pad 7 is bonded between the light source driving circuit 9 and the upper cover 1 with thermal conductive adhesive; the cable of the Y waveguide 11 passes through the threading hole 504 to the lower part of the shell 5, and the gyroscope control circuit 13 is screwed into the threaded holes 505 in the lower part of the shell 5 through four second pillars 14 and three screws. The circuit board is installed on the plane 507, and a threaded hole is set on the upper end of the second pillar 14. The bottom cover 6 is installed on the second pillar and fixed by screws. In addition, the second thermal pad 15 is bonded between the gyroscope control circuit 13 and the bottom cover 6 with thermal conductive adhesive, and the four shell mounting threaded holes 506 are the external mounting holes of the gyroscope.

[0038] like Figure 8As shown, the rectangular groove 303 is the installation limit groove of the Y waveguide 11, the rectangular groove 305 is the installation limit groove of the three-in-one optoelectronic integrated module 10, the straight edge 304 plays a role in limiting and protecting the sensitive optical fiber segment, and the threading holes 306 are all set for threading the cables between the three-in-one optoelectronic integrated module 10 and the gyro control circuit 13 to avoid crossing with the optical fiber and affecting the assembly process. The installation surface 307 is the bonding surface of the optical fiber ring 4, which will be sandblasted to improve the bonding strength.

[0039] In addition, the seam between the upper cover 1 and the outer shell 5 is laser welded to further improve the magnetic shielding performance of the gyroscope. The upper cover 1, the outer shell 5 and the bottom cover 6 are coated with a thermal control coating, and the hemispherical emissivity is not less than 0.88, which further improves the influence of the external temperature on the gyroscope. The outer envelope size of the gyroscope assembled in this embodiment and having complete test functions is 35mm×35mm×35mm, and the weight does not exceed 130g.

Claims

1. A miniature fiber optic gyroscope capable of multiple installations, characterized in that: include: Upper cover, layered seat, adapter seat, optical fiber ring, outer shell, bottom cover, first thermal pad, first pillar, light source driving circuit, three-in-one optoelectronic integrated module, Y waveguide, insulating gasket, gyro control circuit, second pillar, second thermal pad; The outer shell is divided into two parts, the upper part is mainly composed of the adapter, various optical devices, light source driving circuit and upper cover, and the lower part is mainly composed of the optical fiber ring, gyro control circuit and bottom cover; The optical fiber ring is bonded to the adapter, and the optical fiber ring of the adapter is placed into the housing with the surface facing downward; The three-in-one optoelectronic integrated module is used as the main heat source to optimize the thermal environment and is fixed by bonding. The Y waveguide is first fixed to the insulating gasket on the outside, and then the Y waveguide with the insulating gasket is bonded and fixed in the rectangular groove reserved in the adapter. The layered seat is mainly used to coil the non-sensitive optical fiber segment, stack it on the adapter seat, and fix it with the first pillar. The first pillar fixes the layered seat and the adapter seat to the housing through the threaded hole; The light source driving circuit and the upper cover are stacked on the first pillar, and a first thermal conductive pad is bonded between the light source driving circuit and the upper cover; The cable of the Y waveguide passes through the lower part of the shell, the gyro control circuit is connected to the lower part of the shell through the second pillar, the bottom cover is installed on the second pillar, and the second thermal pad is bonded between the gyro control circuit and the bottom cover.

2. A multi-installable micro-fiber gyroscope as claimed in claim 1, characterized in that: The optical fiber ring is bonded to the adapter seat by epoxy glue.

3. A multi-installable micro-fiber gyroscope as claimed in claim 2, characterized in that: The polarization-maintaining optical fiber passes through its optical fiber perforation to the other side of the adapter. The perforated section of the polarization-maintaining optical fiber is protected by a sleeve and fixed by glue at the optical fiber perforation. After the adhesive is cured, the optical fiber ring surface of the adapter is placed into the housing with the fiber facing downward.

4. A multi-installable micro-fiber gyroscope as claimed in claim 3, characterized in that: The three-in-one optoelectronic integrated module is bonded and fixed by using thermal conductive adhesive, and the Y waveguide is bonded and fixed in the rectangular groove reserved in the adapter by using epoxy adhesive.

5. A multi-installable micro-fiber gyroscope as claimed in claim 4, characterized in that: The sensitive optical fiber section is bounded by four straight ribs and is coiled on the adapter. The adapter has a reserved Y-waveguide cable outlet, which can pass through the outer shell to the lower part of the gyroscope to the gyroscope control circuit.

6. A multi-installable micro-fiber gyroscope as claimed in claim 5, characterized in that: The stratified seat and the transfer seat are fixed to the outer shell by using four first pillars through threaded holes.

7. A multi-installable micro-fiber gyroscope as claimed in claim 6, characterized in that: The four first pillars are screwed into the threaded holes on the upper part of the shell, the adapter is installed on the plane, the optical fiber ring is located in the inner cavity, and the upper end of the first pillar is provided with a threaded hole.

8. The multi-installable micro-fiber gyroscope according to claim 7, characterized in that: The light source driving circuit and the upper cover are stacked on the first pillar and fastened by screws; a first heat-conducting pad is bonded between the light source driving circuit and the upper cover by heat-conducting adhesive.

9. A multi-installable micro-fiber gyroscope as claimed in claim 8, characterized in that: The gyro control circuit is screwed to the threaded hole in the lower part of the shell through four second pillars and three screws. The circuit board is installed on a plane. The upper end of the second pillar is provided with a threaded hole. The bottom cover is installed on the second pillar and fixed by screws. In addition, a second thermal pad is bonded between the gyro control circuit and the bottom cover with thermal conductive glue.

10. The multi-installable micro-fiber gyroscope according to claim 9, characterized in that: The threading hole is provided for threading the cables between the three-in-one optoelectronic integrated module and the gyro control circuit. The mounting surface is the bonding surface of the optical fiber ring and is sandblasted.

11. The multi-installable micro-fiber gyroscope according to claim 10, characterized in that: The seam between the upper cover and the outer shell is laser welded, and the raw materials of the upper cover, the outer shell and the bottom cover are all made of high magnetic permeability iron-nickel alloy, the surface is coated with a thermal control coating, and the hemispherical emissivity is ≥0.88.

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