Method for improving heat conduction of optical path assembly of fiber-optic gyroscope

Abstract

The invention belongs to the technical field of fiber-optic gyroscopes, and relates to a method for improving heat conduction of a light path assembly of a fiber-optic gyroscope, the light path assembly comprises a base, a waveguide disc, a light path assembly and a light path assembly, the base is provided with a first annular boss, and the waveguide disc is arranged on the top end face of the first annular boss of the base; the connecting seat is connected to the base; the optical fiber ring is arranged on the connecting seat; and the cover plate is connected with the connecting seat, and the optical fiber ring is arranged on the connecting seat. After the structure is adopted, the device has the beneficial effects that heat source transfer is effectively reduced; the heat insulation effect of the product is effectively improved and the performance of the optical fiber ring is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of fiber optic gyroscopes, and in particular relates to a method for improving the heat conduction of an optical path component of a fiber optic gyroscope. Background Art

[0002] Fiber optic gyroscope is an inertial measurement instrument based on Sagnac effect. As the core component of fiber optic gyroscope, fiber ring is sensitive to changes in the surrounding environment and is most seriously affected by temperature. When there is a temperature distribution gradient along the optical fiber that changes with time and space, a thermally induced non-reciprocal phase difference will be generated, affecting the temperature performance of the fiber optic gyroscope.

[0003] In the prior art, in order to better reduce the influence of the optical fiber ring on the temperature performance of the optical fiber gyroscope, the original optical fiber ring with a metal frame is developed into a frameless optical fiber ring. The frameless optical fiber ring is bonded to the annular bottom surface of the ring base, but it still cannot achieve the expected effect, so it is necessary to make improvements. Summary of the invention

[0004] In order to solve the above problems in the prior art, the present invention provides a method for improving the heat conduction of an optical path component of a fiber optic gyroscope, thereby reducing the influence of a fiber optic ring on the temperature performance of the fiber optic gyroscope.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] As one aspect of the present invention, a method for improving heat conduction of an optical path component of a fiber optic gyroscope is provided. The optical path component comprises: a base, wherein a first annular boss is formed on the base,

[0007] A waveguide plate is arranged on the top surface of the first annular boss of the base;

[0008] A connecting seat, connected to the base;

[0009] An optical fiber ring is arranged on the connecting seat;

[0010] A cover plate, the cover plate is connected to the connection seat, and the optical fiber ring is arranged on the connection seat;

[0011] The connection seat comprises a connection seat body, an inner cavity for the waveguide plate and the first annular boss to be installed in the middle of the connection seat body; a flange portion for the waveguide plate and a mounting plate for installing the first annular boss are formed on the top of the inner cavity; during installation, the flange portion of the waveguide plate is arranged on the top end surface of the first annular boss of the base, the first annular boss passes through the inner cavity, the top end surface of the first annular boss matches with the mounting plate, and the flange portion of the waveguide plate is located between the top end surface of the first annular boss and the mounting plate;

[0012] The connection seat body is formed with a fiber optic ring groove for installing a fiber optic ring, and the notch of the fiber optic ring groove faces upward; the width of the fiber optic ring groove is greater than the width of the fiber optic ring, and the height of the fiber optic ring is less than the depth of the fiber optic ring groove; when the fiber optic ring is connected to the fiber optic ring groove, the bottom of the fiber optic ring is connected to the bottom of the fiber optic ring groove, and there is a preset gap between the outer ring wall of the fiber optic ring and the outer ring wall of the fiber optic ring groove, and there is a preset gap between the inner ring wall of the fiber optic ring and the inner ring wall of the fiber optic ring groove; the cover plate is connected to the notch of the fiber optic ring groove to seal the fiber optic ring in the fiber optic ring groove, and there is a preset gap between the top of the fiber optic ring and the inner surface of the cover plate; the fiber optic ring is bonded to the inner bottom surface of the fiber optic ring groove, and its contact surface is only the inner bottom surface of the fiber optic ring groove, and there are preset gaps between the fiber optic ring and the other three surfaces of the fiber optic ring groove, and heat conduction is only generated on the inner bottom surface of the fiber optic ring groove, and the other surfaces are heat convection.

[0013] Optionally, the depth of the inner cavity is smaller than the height of the first annular boss.

[0014] Optionally, the connection seat is made of 1J series iron-nickel soft magnetic alloy material.

[0015] Optionally, the surrounding surfaces of the connecting seat are sprayed with a temperature-resistant coating.

[0016] Optionally, the temperature-resistant coating is a zirconia ceramic coating, and the thickness of the zirconia ceramic coating is 0.3 mm to 0.4 mm.

[0017] Optionally, the flatness of the zirconium oxide ceramic coating on the inner bottom surface of the optical fiber ring groove reaches 0.01 mm.

[0018] Optionally, an annular gasket is further included, which is made of polyetheretherketone material and is located between the top end surface of the first annular boss and the flange portion of the waveguide disk.

[0019] Optionally, the annular gasket has a thickness of 1 mm.

[0020] Optionally, a matching annular groove matched with the annular gasket is formed on the bottom surface of the flange portion of the waveguide disk. After the annular gasket is matched with the waveguide disk, the surface of the annular gasket is flush with the bottom surface of the waveguide disk.

[0021] Optionally, the mounting plate is provided with a plurality of first mounting holes, the annular gasket is provided with an annular gasket clearance hole matching with the first mounting holes, the flange portion of the waveguide disk is provided with a waveguide disk clearance hole matching with the first mounting holes, and the base is provided with a second mounting hole matching with the first mounting hole.

[0022] The beneficial effects of the heat conduction method for improving the optical path assembly of the fiber optic gyroscope of the present invention are specifically embodied in the following aspects: 1. The fiber optic ring is bonded to the inner bottom surface of the fiber optic ring groove, and its contact surface is only the inner bottom surface of the fiber optic ring groove. There are preset gaps between the fiber optic ring and the other three surfaces of the fiber optic ring groove. Heat conduction is only generated on the inner bottom surface of the fiber optic ring groove, and the other surfaces are heat convection, which reduces the influence of the heat source generated in the first installation cavity on the fiber optic ring. 2. Zirconia ceramic coating is added to the surrounding surfaces of the connecting seat for heat insulation, which is convenient to manufacture and highly efficient; an annular gasket made of polyetheretherketone material is added to perform heat insulation between metal structural parts, effectively reducing heat source transfer; effectively improving the heat insulation effect of the product and improving the performance of the fiber optic ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings in the specification, which constitute a part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0024] Figure 1 It is a structural schematic diagram of the optical path component of the present invention;

[0025] Figure 2 It is a structural cross-sectional view of the optical path component of the present invention;

[0026] Figure 3 It is an exploded front view of the structure of the optical path component of the present invention;

[0027] Figure 4 It is an exploded bottom view of the structure of the optical path component of the present invention;

[0028] Figure 5 It is a three-dimensional front view of the structure of the connecting seat of the present invention;

[0029] Figure 6 It is a bottom view of the structure of the connecting seat of the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] A method for improving heat conduction of an optical path component of a fiber optic gyroscope according to an embodiment of the present application is as follows: Figure 1-Figure 4As shown, the optical path component includes: a base 1, a first annular boss 11 is formed on the base 1, and a first mounting cavity 12 is formed inside the first annular boss 11. The first mounting cavity 12 is used to mount the light source of the fiber optic gyroscope and the circuit board connected to the light source. It should be noted that the light source of the fiber optic gyroscope and the circuit board connected to the light source are prior arts and will not be described in detail here.

[0032] The waveguide plate 2 is arranged on the top surface of the first annular boss 11 of the base 1;

[0033] A connecting seat 3 connected to the base 1;

[0034] The optical fiber ring 4 is arranged on the connecting seat 3;

[0035] The cover plate 5 is connected to the connection seat 3 , and the optical fiber ring 4 is arranged on the connection seat 3 .

[0036] Specifically, Figure 3-Figure 6 As shown, the connection seat 3 is made of 1J series iron-nickel soft magnetic alloy material, and its thermal conductivity is much lower than that of aluminum alloy, which can effectively reduce the influence of temperature change on the optical fiber ring. The connection seat 3 includes a connection seat body 31, and the connection seat body 31 is circular, and an inner cavity 32 is provided in the middle for the waveguide plate 2 and the first annular boss 11 to make way for installation, and the depth of the inner cavity 32 is less than the height of the first annular boss 11; the top of the inner cavity 32 is formed with a flange portion of the waveguide plate 2 and a mounting plate 33 for mounting the first annular boss 11; the mounting plate 33 has an opening, and the opening is used for making way for components of the waveguide plate 2; when installing, the flange portion of the waveguide plate 2 is arranged on the top end surface of the first annular boss 11 of the base 1, the first annular boss 11 passes through the inner cavity 32, and the top end surface of the first annular boss 11 matches with the mounting plate 33, and the flange portion of the waveguide plate 2 is located between the top end surface of the first annular boss 11 and the mounting plate 33;

[0037] The connection seat body 31 is formed with an optical fiber ring groove 34 for installing the optical fiber ring 4, and the notch of the optical fiber ring groove 34 faces upward; the width of the optical fiber ring groove 34 is greater than the width of the optical fiber ring 4, and the height of the optical fiber ring 4 is less than the depth of the optical fiber ring groove 34; when the optical fiber ring 4 is connected to the optical fiber ring groove 34, the bottom of the optical fiber ring 4 is connected to the bottom of the optical fiber ring groove 34, and there is a preset gap between the outer ring wall of the optical fiber ring 4 and the outer ring wall of the optical fiber ring groove 34, and there is a preset gap between the inner ring wall of the optical fiber ring 4 and the inner ring wall of the optical fiber ring groove 34; the cover plate 5 is connected to On the notch of the optical fiber ring groove 34, the optical fiber ring 4 is enclosed in the optical fiber ring groove 34, and there is a preset gap between the top of the optical fiber ring 4 and the inner surface of the cover plate 5. The cover plate 5 is annular, and its inner ring space is used to make way for components of the waveguide disk 2; the optical fiber ring 4 is bonded to the inner bottom surface of the optical fiber ring groove 34, and its contact surface is only the inner bottom surface of the optical fiber ring groove 34. There are preset gaps between the optical fiber ring 4 and the other three surfaces of the optical fiber ring groove 34. Heat conduction is only generated on the inner bottom surface of the optical fiber ring groove 34, and the other surfaces are all heat convection, thereby reducing the influence of the heat source generated in the first installation cavity 12 on the optical fiber ring 4.

[0038] In one embodiment, if Figure 1-Figure 4 As shown, it also includes an annular gasket 6, which is made of polyetheretherketone material and has a thickness of 1 mm; the annular gasket 6 is located between the top end surface of the first annular boss 11 and the flange portion of the waveguide disk 2; through this gasket, the heat source transfer of the metal structure connection can be greatly reduced, and the heat source generated in the base can be isolated.

[0039] In one embodiment, in order to facilitate the connection of the annular gasket 6, a matching annular groove 21 adapted to the annular gasket 6 is formed on the bottom surface of the flange portion of the waveguide plate 2. After the annular gasket 6 is matched with the waveguide plate 2, the surface of the annular gasket 6 is flush with the bottom surface of the waveguide plate 2, that is, the annular gasket 6 can be considered as a part of the flange portion of the waveguide plate 2.

[0040] In this embodiment, Figure 3-Figure 6 As shown, the mounting plate 33 is provided with a plurality of first mounting holes 331, the annular gasket 6 is provided with annular gasket clearance holes 61 matching the first mounting holes 331, the flange portion of the waveguide plate 2 is provided with waveguide plate clearance holes 22 matching the first mounting holes 331, and the base is provided with second mounting holes 13 matching the first mounting holes 331. After the connecting seat 3, the waveguide plate 2, the annular gasket 6 and the base 1 are installed in place, the rod of the fastener passes through the first mounting hole 331, the waveguide plate clearance hole 22, the annular gasket clearance hole 61 in sequence and is connected to the second mounting hole 13, so as to realize the connection of the connecting seat 3, the waveguide plate 2, the annular gasket 6 and the base 1 as a whole.

[0041] In one embodiment, the surrounding surfaces of the connection seat 3 are sprayed with a temperature-resistant coating, which is a zirconium oxide ceramic coating with a thickness of 0.3 mm to 0.4 mm. The flatness of the zirconium oxide ceramic coating on the inner bottom surface of the optical fiber ring groove 34 reaches 0.01 mm, otherwise the temperature performance of the optical fiber ring is affected; adding the zirconium oxide ceramic coating can effectively reduce the temperature transmitted to the optical fiber ring.

[0042] In this embodiment, the connecting seat 3 is made of 1J series iron-nickel soft magnetic alloy material, the thermal conductivity of the 1J series iron-nickel soft magnetic alloy is about 17-19 W / (m·K), and the thermal conductivity of the aluminum alloy is about 238 W / (m·K). A layer of zirconium oxide ceramic coating is sprayed on the surrounding surface of the connecting seat 3, and its thermal conductivity is about 2-3 W / (m·K), and an annular gasket 6 made of polyetheretherketone material is added between the top surface of the connecting seat 3 and the first annular boss 11 of the base 1, and its thermal conductivity is about 0.29 W / (m·K), which can further reduce the temperature change transmitted to the optical fiber ring 4 through the connecting seat 3, thereby reducing the influence of the optical fiber ring 4 on the temperature performance of the optical fiber gyroscope.

[0043] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0044] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0045] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0046] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0047] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A method for improving the heat conduction of an optical path component of a fiber optic gyroscope, characterized in that: The optical path component comprises: a base, on which a first annular boss is formed, A waveguide plate is arranged on the top surface of the first annular boss of the base; A connecting seat, connected to the base; An optical fiber ring is arranged on the connection seat; A cover plate, the cover plate is connected to the connection seat, and the optical fiber ring is arranged on the connection seat; The connection seat comprises a connection seat body, an inner cavity for the waveguide plate and the first annular boss to be installed in the middle of the connection seat body; a flange portion for the waveguide plate and a mounting plate for installing the first annular boss are formed on the top of the inner cavity; during installation, the flange portion of the waveguide plate is arranged on the top end surface of the first annular boss of the base, the first annular boss passes through the inner cavity, the top end surface of the first annular boss matches with the mounting plate, and the flange portion of the waveguide plate is located between the top end surface of the first annular boss and the mounting plate; The connection seat body is formed with a fiber optic ring groove for installing a fiber optic ring, and the notch of the fiber optic ring groove faces upward; the width of the fiber optic ring groove is greater than the width of the fiber optic ring, and the height of the fiber optic ring is less than the depth of the fiber optic ring groove; when the fiber optic ring is connected to the fiber optic ring groove, the bottom of the fiber optic ring is connected to the bottom of the fiber optic ring groove, and there is a preset gap between the outer ring wall of the fiber optic ring and the outer ring wall of the fiber optic ring groove, and there is a preset gap between the inner ring wall of the fiber optic ring and the inner ring wall of the fiber optic ring groove; the cover plate is connected to the notch of the fiber optic ring groove to seal the fiber optic ring in the fiber optic ring groove, and there is a preset gap between the top of the fiber optic ring and the inner surface of the cover plate; the fiber optic ring is bonded to the inner bottom surface of the fiber optic ring groove, and its contact surface is only the inner bottom surface of the fiber optic ring groove, and there are preset gaps between the fiber optic ring and the other three surfaces of the fiber optic ring groove, and heat conduction is only generated on the inner bottom surface of the fiber optic ring groove, and the other surfaces are heat convection.

2. The method for improving heat conduction of an optical path component of a fiber optic gyroscope according to claim 1, characterized in that: The depth of the inner cavity is smaller than the height of the first annular boss.

3. The method for improving heat conduction of an optical path component of a fiber optic gyroscope according to claim 1, characterized in that: The connecting seat is made of 1J series iron-nickel soft magnetic alloy material.

4. The method for improving heat conduction of an optical path component of a fiber optic gyroscope according to claim 1, characterized in that: The surrounding surfaces of the connecting seat are sprayed with a temperature-resistant coating.

5. The method for improving heat conduction of an optical path component of a fiber optic gyroscope according to claim 4, characterized in that: The temperature-resistant coating is a zirconium oxide ceramic coating, and the thickness of the zirconium oxide ceramic coating is 0.3 mm to 0.4 mm.

6. The method for improving heat conduction of an optical path component of a fiber optic gyroscope according to claim 5, characterized in that: The flatness of the zirconium oxide ceramic coating on the inner bottom surface of the optical fiber ring groove reaches 0.01 mm.

7. The method for improving heat conduction of an optical path component of a fiber optic gyroscope according to claim 1, characterized in that: It also includes an annular gasket, which is made of polyetheretherketone material and is located between the top end surface of the first annular boss and the flange portion of the waveguide disk.

8. The method for improving heat conduction of an optical path component of a fiber optic gyroscope according to claim 7, characterized in that: The thickness of the annular gasket is 1 mm.

9. The method for improving heat conduction of an optical path component of a fiber optic gyroscope according to claim 7, characterized in that: A matching annular groove matched with the annular gasket is formed on the bottom surface of the flange portion of the waveguide disk. After the annular gasket is matched with the waveguide disk, the surface of the annular gasket is flush with the bottom surface of the waveguide disk.

10. The method for improving heat conduction of an optical path component of a fiber optic gyroscope according to claim 9, characterized in that: The mounting plate is provided with a plurality of first mounting holes, the annular gasket is provided with annular gasket yielding holes matching with the first mounting holes, the flange portion of the waveguide disk is provided with waveguide disk yielding holes matching with the first mounting holes, and the base is provided with second mounting holes matching with the first mounting holes.

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