Zero offset testing device for optical fiber ring
By setting a sealing member at the bottom of the temperature control box and forming a gap between the foundation and the ground, the problems of heat loss and ground vibration in the fiber ring zero-bias testing device are solved, and higher testing accuracy and stability are achieved.
Patent Information
- Application Number
- CN202422334487.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-24
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-09-24
AI Technical Summary
The rapid loss of heat in the temperature control box of the existing fiber ring zero-bias test device leads to insufficient testing accuracy, and ground vibration affects the accuracy of fiber ring performance testing.
A sealing member is installed at the bottom of the temperature control box. The sealing member contains heat insulation cotton to seal the openings to avoid heat loss; a gap is formed between the foundation and the ground to reduce the impact of ground vibration on the optical fiber ring.
It effectively avoids heat loss in the temperature control box, improves the accuracy of the zero-bias test of fiber rings, and reduces the impact of ground vibration on fiber ring performance testing, and improves the accuracy of the test.
Smart Images
Figure CN223179561U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of optical fiber loops, and particularly relates to a zero-bias test device for an optical fiber loop. Background Art
[0002] With the development and progress of the large-scale application of fiber optic gyroscopes, the improvement of the comprehensive performance of fiber optic gyroscopes has become an important research focus. Among them, the stability of the optical fiber loop has become one of the important research focuses.
[0003] The stability of a fiber optic gyroscope, that is, in a normal temperature or certain fixed-point temperature environment, the fiber optic gyroscope has good zero-bias stability. Existing research shows that the zero-bias stability of a fiber optic gyroscope is most affected by the stability of optical components, especially the optical fiber loop. Therefore, it is necessary to test the zero-bias stability performance of the optical fiber loop at different temperatures before packaging the optical fiber loop.
[0004] The existing zero-bias test device for an optical fiber loop generally includes an independent temperature control box and a support frame. One end of the support frame is placed on the ground and the other end is located inside the temperature control box to support the optical fiber loop. Generally, an opening for the support frame to pass through needs to be opened at the bottom of the temperature control box. In order to avoid the rapid loss of heat inside the temperature control box, a sealing member is generally used to block the opening, but this method still cannot avoid the rapid loss of heat inside the temperature control box, resulting in the accuracy of the zero-bias test of the optical fiber loop. Content of the Utility Model
[0005] Aiming at the deficiencies of the prior art, the utility model provides a zero-bias test device for an optical fiber loop, which can avoid the rapid loss of heat inside the temperature control box and improve the accuracy of the zero-bias test of the optical fiber loop.
[0006] The utility model is realized through the following technical solutions:
[0007] A zero-bias test device for an optical fiber loop includes a temperature control box and a support frame. The temperature control box is placed on the ground and has a cavity. An opening is opened at the bottom of the temperature control box. The support frame passes through the opening and one end of the support frame is located inside the cavity of the temperature control box. The optical fiber loop includes an optical fiber loop body. The optical fiber loop body is placed on the support frame and is located inside the cavity. A sealing member is arranged at the opening. The sealing member is used to seal the opening, and heat insulation cotton is arranged inside the sealing member.
[0008] Further, the sealing member includes a base and a cover. The base is provided with a receiving groove. The heat insulation cotton is filled in the receiving groove. The cover is used to block the opening of the receiving groove.
[0009] Further, a convex platform protrudes from the inner peripheral wall forming the receiving groove. The cover is detachably connected to the convex platform.
[0010] Furthermore, the support frame includes a plurality of support rods passing through the through holes and a support plate disposed inside the temperature control box. The support plate is fixed to the ends of the support rods for placing the optical fiber loop body, and a plurality of through holes for the support rods to pass through are formed in the base.
[0011] Furthermore, an extension edge is formed on the base, and the extension edge is attached to the bottom wall forming the cavity.
[0012] Furthermore, the through holes are formed in the extension edge.
[0013] Furthermore, the zero-bias test device further includes a foundation. The other end of the support frame passes through the temperature control box and is fixedly connected to the foundation. The foundation is disposed on the ground surface, and at least a part of the foundation is located below the ground surface and there is a gap between the foundation and the ground.
[0014] Furthermore, the foundation is integrally formed of cement.
[0015] Furthermore, the foundation is composed of a plurality of stepped square steps. The plurality of square steps include a first square step, a second square step, a third square step, and a fourth square step in sequence from bottom to top. The first square step and the second square step are both located below the ground surface. The third square step passes through the ground surface, and there is the gap between the third square step and the ground surface. The fourth square step is located above the ground surface and is fixedly connected to the support frame.
[0016] Furthermore, the distance between the foundation and the ground surface is 50 mm to 200 mm.
[0017] Compared with the prior art, the advantages of the present utility model are as follows:
[0018] 1. A through hole for the support frame to pass through is formed at the bottom of the temperature control box, and a sealing member is disposed at the through hole. The sealing member is used for sealing the through hole, and heat insulation cotton is disposed inside the sealing member to prevent heat loss inside the temperature control box.
[0019] 2. By forming a gap between the foundation and the ground surface, vibrations generated by vibration sources on the ground are prevented from being transmitted to the optical fiber loop body on the support frame through the ground, thereby affecting the accuracy of the zero-bias performance test of the optical fiber loop. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 is a schematic structural diagram of an optical fiber loop test device;
[0021] Figure 2 is Figure 1 an enlarged view of part A in
[0022] Figure 3It is a schematic structural diagram of a temperature control box;
[0023] Figure 4 It is a front view of an optical fiber loop test device;
[0024] Figure 5 It is Figure 4 The sectional view along A-A in
[0025] Figure 6 It is Figure 5 The enlarged view of part B in
[0026] Figure 7 It is an exploded view of a plugging member;
[0027] Figure 8 It is Figure 5 The enlarged view of part C in
[0028] 1. Temperature control box; 10. Cavity; 100. Bottom wall; 11. Opening; 2. Support frame; 20. Support rod; 21. Support plate; 3. Foundation; 30. First step; 31. Second step; 32. Third step; 33. Fourth step; 4. Gyro system circuit board; 5. Host computer; 6. Ground; 60. Ground surface; 7. Optical fiber loop body; 7o. Tail fiber; 8. Plugging member; 80. Heat insulation cotton; 81. Base; 810. Accommodating groove; 811. Through hole; 812. Extension edge; 82. Cover; 83. Boss; 9. Gap; 90. Coarse sand. Specific embodiments
[0029] The following is a non-limiting and detailed description of the technical solution of the utility model in conjunction with the preferred embodiments and their accompanying drawings. In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present utility model and should not be construed as a limitation of the present utility model.
[0030] As Figure 1As shown in the figure, a fiber optic loop zero-bias test device according to an embodiment of the present utility model includes a temperature control box 1, a support frame 2, a foundation 3, a gyro system circuit board 4, and a host computer 5. The temperature control box 1 is placed on the ground 6 and the temperature control box 1 has a cavity 10. One end of the support frame 2 is located inside the cavity 10 of the temperature control box 1, and the other end passes through the temperature control box 1 and is fixedly connected to the foundation 3. The foundation 3 is arranged on the ground surface 60, at least part of the foundation 3 is located below the ground 6 and there is a gap 9 between the foundation 3 and the ground 6. The fiber optic loop includes a fiber optic loop body 7 and a pigtail 70 connected to the fiber optic loop body 7. The fiber optic loop body 7 is placed on the support frame 2 and is located inside the cavity 10. The pigtail 70 is connected to the gyro system circuit board 4, and the gyro system circuit board and the host computer 5 are connected. By forming a gap 9 between the foundation 3 and the ground 6, it is avoided that the vibration generated by the vibration source on the ground 6 is transmitted to the fiber optic loop body 7 on the support frame 2 through the ground 6, thereby affecting the accuracy of the fiber optic loop zero-bias performance test.
[0031] The foundation 3 is integrally formed of cement, and the foundation 3 is composed of a plurality of stepped square steps, and the transverse areas of the plurality of square steps gradually decrease from bottom to top along the axial direction of the foundation 3. The stepped design of the foundation 3 can improve the vibration isolation effect and has good stability.
[0032] The bottom of the support frame 2 is built in the foundation 3 made of cement.
[0033] The plurality of square steps sequentially include a first square step 30, a second square step 31, a third square step 32, and a fourth square step 33 from bottom to top. Both the first square step 30 and the second square step 31 are located below the ground 6. The third square step 32 passes through the ground 6, and there is a gap 9 between the third square step 32 and the ground 6. The fourth square step 33 is located above the ground 6 and is fixedly connected to the support frame 2. The number of square steps can be selected according to requirements, and the specific number is not less than three.
[0034] The thicknesses of the first square step 30, the second square step 31, and the third square step 32 gradually increase.
[0035] The distance d between the foundation 3 and the ground 6 is 50 mm to 200 mm.
[0036] The distance d between the foundation 3 and the ground 6 gradually decreases from bottom to top.
[0037] Coarse sand 90 is filled in the gap 9 and near the position below the ground 6 to prevent underground moisture from reaching above the ground 6 through the gap 9. The coarse sand 90 can effectively absorb underground moisture and, compared with fine sand, the coarse sand 90 has a poor vibration transmission effect, preventing the vibration of the ground 6 from being transmitted to the foundation 3 through the coarse sand 90.
[0038] An opening 11 for the support frame 2 to pass through is provided at the bottom of the temperature control box 1, and a sealing member 8 is arranged at the opening 11. The sealing member 8 is used to seal the opening 11.
[0039] As Figure 7 shown, a heat insulation cotton 80 is arranged inside the plugging member 8. Specifically, the plugging member 8 includes a base 81 and a cover 82. The base 81 is provided with a receiving groove 810. The heat insulation cotton 80 is filled in the receiving groove 810. The cover 82 is used to plug the opening of the receiving groove 810. It should be noted that other heat insulation materials can also be filled in the receiving groove 810. The plugging member 8 is arranged to be detachable for facilitating the replacement of different heat insulation materials.
[0040] A boss 83 protrudes from the inner peripheral wall forming the receiving groove 810. The cover 82 is detachably connected to the boss 83. Specifically, the cover 82 is fixed on the boss 83 by screws.
[0041] The support frame 2 includes a plurality of support rods 20 passing through the through holes 11 and a support plate 21 arranged inside the temperature control box 1. The support plate 21 is fixed at the end of the support rods 20 for placing the optical fiber ring body 7. A plurality of through holes 811 for the support rods 20 to pass through are formed on the base 81.
[0042] As Figure 8 shown, an extension edge 812 is further formed on the base 81. The extension edge 812 is attached to the bottom wall 100 forming the cavity 10, and the through holes 811 are formed on the extension edge 812. The base 81 is supported by the bottom wall 100, which facilitates the disassembly and installation of the plugging member 8.
[0043] The above embodiments only represent several implementation manners of the present utility model. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model shall be subject to the appended claims.
Claims
1. An optical fiber loop zero-bias test device, characterized in that It includes a temperature control box (1) and a support frame (2). The temperature control box (1) is placed on the ground (6), and the temperature control box (1) has a cavity (10). An opening (11) is formed at the bottom of the temperature control box (1). The support frame (2) passes through the opening (11), and one end of the support frame (2) is located inside the cavity (10) of the temperature control box (1). The optical fiber loop includes an optical fiber loop body (7). The optical fiber loop body (7) is placed on the support frame (2) and is located inside the cavity (10). A sealing member (8) is provided at the opening (11). The sealing member (8) is used to seal the opening (11), and heat insulation cotton (80) is provided inside the sealing member (8).
2. The fiber optic loop zero-bias test device according to claim 1, wherein The sealing member (8) includes a base (81) and a cover (82). The base (81) is provided with a receiving groove (810). The heat insulation cotton (80) is filled in the receiving groove (810). The cover (82) is used to seal the opening of the receiving groove (810).
3. The fiber optic loop zero - bias test device according to claim 2, characterized in that, A boss (83) protrudes from the inner peripheral wall forming the receiving groove (810). The cover (82) is detachably connected to the boss (83).
4. The fiber optic loop zero bias test device according to claim 2, wherein The support frame (2) includes a plurality of support rods (20) passing through the opening (11) and a support plate (21) provided inside the temperature control box (1). The support plate (21) is fixed at the end of the support rod (20) for placing the optical fiber loop body (7). A plurality of through holes (811) for the support rods (20) to pass through are formed on the base (81).
5. A fiber optic loop zero-bias test device according to claim 4, characterized in that, An extension edge (812) is further formed on the base (81). The extension edge (812) is attached to the bottom wall (100) forming the cavity (10).
6. The fiber optic loop zero-bias testing device according to claim 5, wherein The through holes (811) are formed on the extension edge (812).
7. A fiber optic loop zero-bias testing device according to claim 1, characterized in that, The zero-bias test device further includes a foundation (3). The other end of the support frame (2) passes through the temperature control box (1) and is fixedly connected to the foundation (3). The foundation (3) is provided on the ground surface (60). The foundation (3) is at least partially located below the ground (6) and there is a gap (9) between the foundation (3) and the ground (6).
8. The fiber optic loop zero-bias testing device according to claim 7, characterized in that, The foundation (3) is integrally formed with cement.
9. The optical fiber loop zero-bias test device according to claim 7, characterized in that, The foundation (3) is composed of a plurality of stepped square steps. The plurality of square steps successively include a first square step (30), a second square step (31), a third square step (32), and a fourth square step (33) from bottom to top. The first square step (30) and the second square step (31) are both located below the ground (6). The third square step (32) passes through the ground (6), and there is the gap (9) between the third square step (32) and the ground (6). The fourth square step (33) is located above the ground (6) and is fixedly connected to the support frame (2).
10. A fiber optic loop zero-bias testing device according to claim 7, characterized in that, The distance (d) between the foundation (3) and the ground (6) is 50 mm to 200 mm.