Small-size three-axis optical fiber gyroscope

Abstract

The utility model provides a small-size three-axis optical fiber gyroscope and relates to the technical field of optical fiber gyroscopes. The small-size three-axis optical fiber gyroscope comprises a gyroscope body, an upper cover, four side covers, an optical fiber ring assembly, a light source plate and a circuit mainboard, mounting parts are arranged on the outer side of the gyroscope body, the mounting parts are five mounting grooves, and the five mounting grooves are divided into the upper mounting groove, the front mounting groove, the left mounting groove, the right mounting groove and the rear mounting groove according to the relative positions. The bottom surface of the left installation groove, the bottom surface of the rear installation groove and the groove bottom of the right installation groove are all provided with threaded hole systems used for installing optical fiber ring assemblies. According to the utility model, under the condition of comprehensively considering the size of the existing optical device and the size of the optical fiber ring, by taking the requirement on the use precision as a first principle, the thickness of each region of the gyroscope body is compressed by fully considering the spatial layout, finely controlling the size of the structural characteristics and applying mechanical analysis software on the premise of firmly installing each device; the compression of the volume of the gyroscope body is realized.

Description

Technical Field

[0001] This utility model relates to the field of fiber optic gyroscope technology, specifically a small-volume three-axis fiber optic gyroscope. Background Technology

[0002] Fiber optic gyroscopes are inertial navigation devices based on the Sagnac principle, used to measure angular displacement and angular velocity. Compared to traditional mechanical gyroscopes, they have no rotating mechanical parts, and compared to laser gyroscopes, they do not have latch-up issues, resulting in extremely low failure rates and high sensitivity.

[0003] A three-axis fiber optic gyroscope has three fiber optic ring assemblies, with the axes of the fiber optic rings being orthogonal in space to each other. It can measure the angular velocity of an object's three-dimensional motion to determine the object's motion state.

[0004] As can be seen from the Sagnac principle, the length of the fiber optic loop directly affects the accuracy of the fiber optic gyroscope. Currently, the three-axis fiber optic gyroscopes on the market are affected by the size of the fiber optic loop, resulting in an overall design that is too large, heavy, and difficult to carry. This makes them unsuitable for certain installation surfaces or spaces with weight and volume limitations.

[0005] Therefore, it is necessary to design a three-axis fiber optic gyroscope that is ultra-small in size and has the required accuracy. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a small-volume three-axis fiber optic gyroscope, which solves the problem mentioned in the background art that the three-axis fiber optic gyroscopes currently on the market are affected by the volume of the fiber optic ring, resulting in an overall design that is too large, heavy, and difficult to carry, and does not meet the requirements of certain installation surfaces or spaces with weight and volume limitations.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a small-volume three-axis fiber optic gyroscope, comprising a gyroscope body, a top cover, four side covers, a fiber optic ring assembly, a light source board, and a circuit board. The gyroscope body has mounting components on its outer side, consisting of five mounting slots, which are, according to their relative positions, an upper mounting slot, a front mounting slot, a left mounting slot, a right mounting slot, and a rear mounting slot. The bottom surfaces of the left mounting slot, the rear mounting slot, and the right mounting slot are all provided with threaded holes for mounting the fiber optic ring assembly. The bottom surfaces of the left, rear, and right mounting slots are perpendicular to each other. The bottom of the right mounting slot is parallel to the mounting surface of the gyroscope body. The front, left, right, and rear mounting slots are all connected to the upper mounting slot.

[0008] Preferably, the top edge of the gyroscope body has a thin wall with a thickness of 1mm-2mm.

[0009] Preferably, the diameter of the fiber optic ring assembly is 33mm-34mm and its height is 15mm-16mm. The fiber optic ring assembly includes a ring shell, a fiber optic ring, a ring base, and an oblique hole. The fiber optic ring is installed on the ring base with adhesive. The oblique hole is opened on the ring base. The tail fiber of the fiber optic ring passes through the oblique hole and is coiled on the lower surface of the ring base. The ring base and the ring shell are fixedly installed together.

[0010] Preferably, the front mounting groove is elliptical with a depth of 6.5mm-11.3mm. The bottom of the front mounting groove has a cross-shaped pit with a depth of 0.5mm-5mm. The bottom of the front mounting groove has four cylindrical bosses with a diameter of 3.5mm and a height of 3mm. Each cylindrical boss has an M2 threaded hole at its center. The light source board is mounted on the cylindrical boss through the M2 threaded hole.

[0011] Preferably, the right mounting slot has a convex structure with a height of 17mm-21mm, and a circular arc on the side, the diameter of which is larger than the diameter of the fiber optic ring assembly.

[0012] Preferably, the upper mounting groove is a rectangular structure with a depth of 11mm-12mm, and the four corners of the upper mounting groove are rounded. A square boss with a length of 5mm and a width of 5mm is installed around the upper mounting groove. The height of the square boss is 7mm-8mm. The circuit board is mounted on the square boss. Thin plates are installed at the bottom four corners of the upper mounting groove.

[0013] Preferably, the bottom surface of the left mounting slot and the bottom surface of the rear mounting slot extend into the interior of the upper mounting slot by a distance of 3.5 mm.

[0014] Preferably, the bottom of the upper mounting groove has an oblong hole, which is located directly above the threaded hole system inside the right mounting groove.

[0015] Preferably, the gyroscope body is made of aluminum alloy, and the outer shell and base of the fiber optic ring assembly are both made of 1J85 magnetic shielding material.

[0016] This invention provides a small-volume three-axis fiber optic gyroscope, which has the following advantages:

[0017] This compact three-axis fiber optic gyroscope, taking into account the dimensions of existing optical components and fiber optic rings, prioritizes accuracy. Through meticulous spatial planning and precise control of structural features, and by employing mechanical analysis software, the thickness of various regions of the gyroscope body is compressed, thereby achieving a reduction in the gyroscope's volume, while ensuring the secure installation of all components. Attached Figure Description

[0018] Figure 1 This is an exploded view of the small-volume three-axis fiber optic gyroscope of this utility model;

[0019] Figure 2 This is a schematic diagram of the external structure of the gyroscope body of this utility model;

[0020] Figure 3 This is an isometric view of the gyroscope body of this utility model;

[0021] Figure 4 This is a rear view of the gyroscope body of this utility model;

[0022] Figure 5 This is a cross-sectional view of the gyroscope body of this utility model;

[0023] Figure 6 This is a view of the fiber optic ring assembly of this utility model.

[0024] In the diagram: 1. Gyroscope body; 2. Top cover; 3. Side cover; 4. Fiber optic ring assembly; 41. Angled hole; 42. Fiber optic ring; 43. Ring shell; 44. Ring base; 5. Mounting components; 51. Upper mounting slot; 52. Front mounting slot; 53. Left mounting slot; 54. Right mounting slot; 55. Rear mounting slot; 6. Threaded hole system; 7. Thin wall; 8. Cross-shaped deep pit; 9. Cylindrical boss; 10. Square boss; 11. Thin sheet; 12. Waist-shaped hole; 13. Light source board; 14. Circuit board. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] Reference Figures 1-6 This utility model provides a small-volume three-axis fiber optic gyroscope, including a gyroscope body 1, a top cover 2, four side covers 3, a fiber optic ring assembly 4, a light source board 13, and a circuit board 14. The outer side of the gyroscope body 1 is provided with a mounting component 5, which consists of five mounting slots. According to their relative positions, they are the upper mounting slot 51, the front mounting slot 52, the left mounting slot 53, the right mounting slot 54, and the rear mounting slot 55. The bottom surface of the left mounting slot 53, the bottom surface of the rear mounting slot 55, and the bottom of the right mounting slot 54 are all provided with threaded holes 6 for mounting the fiber optic ring assembly 4. The bottom surfaces of the left mounting slot 53, the rear mounting slot 55, and the right mounting slot 54 are perpendicular to each other. The bottom of the right mounting slot 54 is parallel to the mounting surface of the gyroscope body 1. The front mounting slot 52, the left mounting slot 53, the right mounting slot 54, and the rear mounting slot 55 are respectively connected to the upper mounting slot 51.

[0027] The top edge of the gyroscope body 1 has a thin wall with a thickness of 1mm-2mm to ensure a good seal when the top cover 2 and the gyroscope body 1 are combined.

[0028] The front mounting groove 52 is elliptical and has a depth of 6.5mm-11.3mm. The bottom of the front mounting groove 52 has a cross-shaped pit 8 with a depth of 0.5mm-5mm. The bottom of the front mounting groove 52 has four cylindrical bosses 9 with a diameter of 3.5mm and a height of 3mm. Each cylindrical boss 9 has an M2 threaded hole in its center. The light source board 13 is mounted on the cylindrical bosses 9 through the M2 threaded holes.

[0029] The right mounting slot 54 has a convex structure with a height of 17mm-21mm and an arc on its side, the diameter of which is larger than the diameter of the fiber optic ring assembly 4. The diameters of the left mounting slot 53 and the rear mounting slot 55 are larger than the diameter of the fiber optic ring assembly 4, and their depths are greater than the height of the fiber optic ring assembly 4. The height of the right mounting slot 54 is greater than the height of the fiber optic ring assembly 4. After the three fiber optic ring assemblies 4 are installed, their axes are orthogonal to each other.

[0030] The upper mounting slot 51 is a rectangular structure with a depth of 11mm-12mm. All four corners of the upper mounting slot 51 are rounded (the radius of the rounded corner is greater than or equal to 12mm, and the radius of the rounded corner is greater than the minimum bending radius of the optical fiber, which can effectively avoid loss of the accuracy of the optical fiber ring assembly). Square bosses 10 with a length of 5mm and a width of 5mm are installed around the upper mounting slot 51. The height of the square bosses 10 is 7mm-8mm. The circuit board 14 is installed on the square bosses 10. Thin plates 11 are installed at the four bottom corners of the upper mounting slot 51. The thin plates 11 can prevent the optical fiber from bouncing and keep it close to the bottom surface of the upper mounting slot 51.

[0031] The bottom surface of the left mounting slot 53 and the bottom surface of the rear mounting slot 55 extend into the interior of the upper mounting slot 51 by a distance of 3.5mm, which is equivalent to increasing the load-bearing area of ​​the mounting surface. This can disperse the load on the fiber optic ring assembly 4 and increase vibration stability.

[0032] The bottom of the upper mounting groove 51 has a waist-shaped hole 12, which is located directly above the threaded hole system 6 inside the right mounting groove 54. The size of the waist-shaped hole 12 is larger than the diameter of the tightening tool.

[0033] In one aspect of this embodiment, the fiber optic ring assembly 4 has a diameter of 33mm-34mm and a height of 15mm-16mm. The fiber optic ring assembly 4 includes a ring housing 43, a fiber optic ring 42, a ring base 44, and an oblique hole 41. The fiber optic ring 42 is mounted on the ring base 44 with adhesive. The oblique hole 41 is formed on the ring base 44. The tail fiber of the fiber optic ring 42 passes through the oblique hole 41 and is coiled around the lower surface of the ring base 44. The ring base 44 is fixedly installed together with the ring housing 43.

[0034] In one aspect of this embodiment, the gyroscope body 1 is made of aluminum alloy, and the ring shell 43 and ring base 44 of the fiber optic ring assembly 4 are both made of 1J85 magnetic shielding material.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A small-volume three-axis fiber optic gyroscope, comprising a gyroscope body (1), a top cover (2), four side covers (3), a fiber optic ring assembly (4), a light source board (13), and a circuit board (14), characterized in that, The gyroscope body (1) is provided with an installation component (5) on its outer side. The installation component (5) consists of five installation slots, which are divided according to their relative positions as an upper installation slot (51), a front installation slot (52), a left installation slot (53), a right installation slot (54), and a rear installation slot (55). The bottom surface of the left installation slot (53), the bottom surface of the rear installation slot (55), and the bottom of the right installation slot (54) are all provided with threaded holes (6) for installing the fiber optic ring assembly (4). The bottom surfaces of the left installation slot (53), the rear installation slot (55), and the right installation slot (54) are perpendicular to each other. The bottom of the right installation slot (54) is parallel to the mounting surface of the gyroscope body (1). The front installation slot (52), the left installation slot (53), the right installation slot (54), and the rear installation slot (55) are respectively connected to the upper installation slot (51).

2. The small-volume triaxial fiber optic gyroscope according to claim 1, characterized in that: The top edge of the gyroscope body (1) has a thin wall with a thickness of 1mm-2mm.

3. The small-volume triaxial fiber optic gyroscope according to claim 1, characterized in that: The diameter of the fiber optic ring assembly (4) is 33mm-34mm and its height is 15mm-16mm. The fiber optic ring assembly (4) includes a ring shell (43), a fiber optic ring (42), a ring base (44) and an oblique hole (41). The fiber optic ring (42) is installed on the ring base (44) with glue. The oblique hole (41) is opened on the ring base (44). The tail fiber of the fiber optic ring (42) passes through the oblique hole (41) and is coiled on the lower surface of the ring base (44). The ring base (44) is fixedly installed together with the ring shell (43).

4. The small-volume three-axis fiber optic gyroscope according to claim 1, characterized in that: The front mounting groove (52) is elliptical and has a depth of 6.5mm-11.3mm. The bottom of the front mounting groove (52) has a cross-shaped pit (8) with a depth of 0.5mm-5mm. The bottom of the front mounting groove (52) has four cylindrical bosses (9) with a diameter of 3.5mm and a height of 3mm. Each cylindrical boss (9) has an M2 threaded hole at its center. The light source board (13) is mounted on the cylindrical bosses (9) through the M2 threaded holes.

5. The small-volume triaxial fiber optic gyroscope according to claim 1, characterized in that: The right mounting slot (54) has a convex structure with a height of 17mm-21mm and a circular arc on the side, and the diameter of the circular arc is greater than the diameter of the fiber optic ring assembly (4).

6. The small-volume triaxial fiber optic gyroscope according to claim 1, characterized in that: The upper mounting groove (51) is a rectangular structure with a depth of 11mm-12mm. The four corners of the upper mounting groove (51) are rounded. A square boss (10) with a length of 5mm and a width of 5mm is installed around the upper mounting groove (51). The height of the square boss (10) is 7mm-8mm. The circuit board (14) is installed on the square boss (10). Thin plates (11) are installed at the four bottom corners of the upper mounting groove (51).

7. The small-volume triaxial fiber optic gyroscope according to claim 1, characterized in that: The bottom surface of the left mounting slot (53) and the bottom surface of the rear mounting slot (55) extend into the interior of the upper mounting slot (51) by a distance of 3.5 mm.

8. The small-volume three-axis fiber optic gyroscope according to claim 1, characterized in that: The bottom of the upper mounting groove (51) has a waist-shaped hole (12), which is located directly above the threaded hole system (6) inside the right mounting groove (54).

9. The small-volume three-axis fiber optic gyroscope according to claim 3, characterized in that: The gyroscope body (1) is made of aluminum alloy, and the outer shell (43) and the base (44) of the fiber optic ring assembly (4) are both made of 1J85 magnetic shielding material.

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