Optical fiber ring tail fiber posture adjusting device

Abstract

The utility model provides an optical fiber ring tail fiber posture adjusting device which comprises a base, a positioning taper sleeve is arranged on the base and used for containing an optical fiber ring, a first lifting piece and a second lifting piece which can independently ascend and descend are arranged on the base, a first ejector rod set is arranged at the upper end of the first lifting piece, and a second ejector rod set is arranged at the upper end of the second lifting piece. One end of the first ejector rod set and one end of the second ejector rod set abut against the outer wall of the optical fiber ring, the first ejector rod set and the second ejector rod set are each provided with a tail fiber passing gap, the tail fiber passing gap of the first ejector rod set is smaller than the tail fiber passing gap of the second ejector rod set, and the problem that the lengths are inconsistent due to the fact that the tail fiber outlet posture of a traditional optical fiber ring is unreasonable is solved.

Description

Technical Field

[0001] The utility model relates to the field of polarization maintaining fiber optic loops, and in particular to a device for adjusting the attitude of the pigtail of a fiber optic loop. Background Art

[0002] The fiber optic gyroscope works based on the Sagnac effect. Its main principle feature is that two light waves start from a point and propagate in opposite directions along the same optical path, forming a closed loop. When they return to this point after one round, if the closed optical path rotates relative to the inertial space in its plane, the phases of the two light waves change, thereby detecting the rotational angular velocity. The polarization maintaining fiber optic loop is the most core optical device in the fiber optic gyroscope. When there are temperature disturbances with asymmetric positions in the polarization maintaining fiber optic loop, the two light waves propagating in opposite directions will generate a non-reciprocal phase shift when passing through this section of the fiber at different times. Asymmetric stress changes will also produce a similar non-reciprocal phase shift. This non-reciprocity of the Sagnac ring interferometer caused by temperature disturbances is later called the Shupe effect. The Shupe effect will further affect the polarization error and zero bias error of the fiber optic gyroscope. We call the output error generated by the fiber optic loop due to the Shupe effect the fiber optic loop temperature error.

[0003] To reduce or avoid the fiber optic loop temperature error, when winding the fiber optic loop, it is usually wound starting from the midpoint of the fiber and a specific symmetric winding method is adopted. In the method of winding the fiber optic loop, there are already mature four-pole symmetric winding methods, eight-pole symmetric winding methods, sixteen-pole symmetric winding methods, etc. to ensure the symmetry of the fiber optic loop. After the fiber optic loop body fiber is wound according to the specified length or number of layers, it is necessary to perform a fiber splicing process on the two reverse pigtails to make them exit the fiber in the same direction, which is convenient for the assembly of the fiber optic gyroscope. Currently, the common fiber splicing method for the fiber optic loop is that the first pigtail walks in a reverse semi-“O” shape and then overlaps and splices with the second pigtail. This method is convenient to operate and has high engineering efficiency, but the lengths of the two pigtails from the winding end point to the fiber splicing point are inconsistent, which will increase the overall asymmetry of the fiber optic loop. Especially as the size of the fiber optic loop increases, its asymmetry becomes more prominent, thereby increasing the fiber optic loop temperature error. Summary of the Utility Model

[0004] The utility model provides a device for adjusting the attitude of the pigtail of a fiber optic loop, which solves the problem of inconsistent lengths caused by the unreasonable attitude of the pigtail of the traditional fiber optic loop when exiting the fiber.

[0005] To solve the above technical problems, the technical solution adopted by the present utility model is as follows: An optical fiber loop pigtail attitude adjustment device, comprising a base, on which a positioning cone sleeve is provided for placing the optical fiber loop. On the base, there are a first lifting member and a second lifting member that can be independently lifted. At the upper end of the first lifting member, there is a first set of ejector rods, and at the upper end of the second lifting member, there is a second set of ejector rods. One end of the first set of ejector rods and the second set of ejector rods abuts against the outer wall of the optical fiber loop. Both the first set of ejector rods and the second set of ejector rods are provided with pigtail passing gaps, and the pigtail passing gap of the first set of ejector rods is smaller than that of the second set of ejector rods.

[0006] In a preferred embodiment, at the upper end of the first lifting member, there is a chute portion, in which two symmetrically arranged sliding sleeves are provided. In the sliding sleeve, there is a first threaded hole cavity. Both the first set of ejector rods and the second set of ejector rods each include two ejector rod assemblies arranged in parallel at intervals. The ejector rod assembly includes a rod sleeve, in which a telescopically sleeved ejector rod is provided. The ejector rod is used to contact the second set of ejector rods. At the upper end of the second lifting member, there is a second threaded hole cavity. The rod sleeve of the first set of ejector rods is threadedly sleeved with the first threaded hole cavity, and the rod sleeve of the second set of ejector rods is threadedly sleeved with the second threaded hole cavity. On the second lifting member, there is a vertical avoidance groove for avoiding the first set of ejector rods.

[0007] In a preferred embodiment, on one side of the sliding sleeve, there is a guide rod and a screw rod. The guide rod passes through and is slidably sleeved with the end wall of the chute portion. The screw rod passes through the end wall of the chute portion and is sleeved with a limit nut in threaded connection at the end. A second spring is sleeved on the guide rod, and both ends of the second spring respectively abut against the sliding sleeve and the inner wall of the chute portion.

[0008] In a preferred embodiment, a first spring is provided in the rod sleeve, and an end cap set screw is provided at the inner end of the rod sleeve. Both ends of the first spring respectively abut against the ejector rod and the end cap set screw.

[0009] In a preferred embodiment, a vertical seat is provided at the upper end of the base. The first lifting member and the second lifting member are respectively slidably inserted into the vertical seat. On both sides of the vertical seat, there are strip-shaped vertical grooves. At the lower ends of the first lifting member and the second lifting member, there are locking screws respectively, and the locking screws pass through the strip-shaped vertical grooves to be threadedly connected with the first lifting member or the second lifting member.

[0010] In a preferred embodiment, a threaded post is provided on the base, and a lifting nut in threaded connection is sleeved on the threaded post and slides on the threaded post. The lower end of the positioning cone sleeve abuts against the lifting nut.

[0011] In a preferred embodiment, a plugging hole is provided at the upper end of the threaded post, and there is also a pressing frame, which includes a magnetic block and an inserting rod portion. The inserting rod portion is inserted into the plugging hole, and the magnetic block attracts the upper end of the threaded post. Telescopically extensible inclined extension rods are provided at both ends of the pressing frame, and contact pieces are provided at the lower ends of the inclined extension rods to press the optical fiber loop.

[0012] The beneficial effects of the present utility model are as follows: By using a tooling to assist two pigtails, with the marking boss as the central axis, they are symmetrically arranged for fiber splicing to prevent inconsistent fiber output lengths, which may affect the polarization error and zero-bias error of the fiber optic gyroscope. The adjustment device uses multiple ejector rods to constrain the fiber splicing position and can assist in fixing with glue, which is more reliable than visual observation by the human eye and can improve the length consistency. The device can adjust the height and extended length of the ejector rods to adapt to different specifications of fiber optic rings. Description of the Drawings

[0013] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0014] Figure 1 is a schematic diagram of the present utility model.

[0015] Figure 2 is a schematic diagram of the main structure of the present utility model.

[0016] Figure 3 is a cross-sectional view of the main structure of the present utility model.

[0017] Figure 4 is a cross-sectional view of the ejector rod group of the present utility model.

[0018] Figure 5 is an enlarged view of the top end of the lifting member of the present utility model.

[0019] Figure 6 is a schematic diagram of the sliding sleeve of the present utility model.

[0020] Figure 7 is a schematic diagram of the ejector rod group and the pigtail of the present utility model.

[0021] Figure 8 is a diagram of the attitude change of the pigtail.

[0022] In the figure: base 1; vertical seat 101; threaded column 102; socket hole 103; positioning cone sleeve 2; lifting nut 201; pressing frame 3; magnetic block 301; inserting rod part 302; obliquely extending rod 303; contact piece 304; first ejector rod group 4; rod sleeve 401; telescopic rod 402; first spring 403; supplementary rod section 404; end cap set screw 405; narrowing hole 406; large diameter end 407; second ejector rod group 5; first lifting member 6; chute part 601; sliding sleeve 602; first threaded hole cavity 603; guide rod 604; screw rod 605; limit nut 606; second spring 607; second lifting member 7; second threaded hole cavity 701; avoidance groove 702; fiber optic ring 8; azimuth marking part 801; glue application position 802; first pigtail 803; second pigtail 804; locking screw 9; strip-shaped vertical groove 901. Detailed Embodiments

[0023] Embodiment 1:

[0024] As Figure 1-8 In [reference], an optical fiber loop pigtail attitude adjustment device includes a base 1. A positioning cone sleeve 2 is provided on the base 1. The positioning cone sleeve 2 is used to place the optical fiber loop 8. An independently liftable first lifting member 6 and a second lifting member 7 are provided on the base 1. A first ejector rod group 4 is provided at the upper end of the first lifting member 6, and a second ejector rod group 5 is provided at the upper end of the second lifting member 7. One end of the first ejector rod group 4 and the second ejector rod group 5 abuts against the outer wall of the optical fiber loop 8. The first ejector rod group 4 and the second ejector rod group 5 are both provided with pigtail passing gaps, and the pigtail passing gap of the first ejector rod group 4 is smaller than the pigtail passing gap of the second ejector rod group 5.

[0025] An orientation marking portion 801 is usually provided on the loop body of the optical fiber loop 8. Common ones are prominent features such as bosses and grooves, which are used to indicate the position of the midpoint when the optical fiber is initially wound. Therefore, when the final outgoing fiber postures of the first pigtail 803 and the second pigtail 804 are symmetric about the orientation marking portion 801, the optical fibers in two directions can be ensured to be of equal length.

[0026] In a preferred solution, a chute portion 601 is provided at the upper end of the first lifting member 6. Two symmetrically arranged sliding sleeves 602 are provided in the chute portion 601. A first threaded hole cavity 603 is provided in the sliding sleeve 602. The first ejector rod group 4 and the second ejector rod group 5 both include ejector rod assemblies arranged in parallel. The ejector rod assembly includes a rod sleeve 401. A telescopically extendable rod 402 is slidably sleeved in the rod sleeve 401. The telescopically extendable rod 402 is used to contact the second ejector rod group 5. A second threaded hole cavity 701 is provided at the upper end of the second lifting member 7. The rod sleeve 401 of the first ejector rod group 4 is threadedly sleeved with the first threaded hole cavity 603, and the rod sleeve 401 of the second ejector rod group 5 is threadedly sleeved with the second threaded hole cavity 701. A vertical avoidance groove 702 is provided on the second lifting member 7. The avoidance groove 702 is used to avoid the first ejector rod group 4.

[0027] The second threaded hole cavity 701 is provided in multiple groups with different spacings. According to the thickness and diameter of the optical fiber loop 8, the second ejector rod group 5 can be installed in a second threaded hole cavity 701 at a suitable position to change the curvature when guiding the pigtail.

[0028] In a preferred solution, a guide rod 604 and a screw rod 605 are provided on one side of the sliding sleeve 602. The guide rod 604 passes through and is slidably sleeved with the end wall of the chute portion 601. The screw rod 605 passes through the end wall of the chute portion 601 and a limit nut 606 threadedly connected is sleeved at the end. A second spring 607 is sleeved on the guide rod 604. Both ends of the second spring 607 abut against the sliding sleeve 602 and the inner wall of the chute portion 601 respectively.

[0029] Under the action of the force maintained by the second spring 607, adjusting the limit nut 606 can change the final position of the sliding sleeve 602 and adjust the spacing between the two telescopically extendable rods 402 of the second ejector rod group 5 to adapt to pigtails of different diameters.

[0030] In a preferred embodiment, a first spring 403 is provided inside the rod sleeve 401. An end capping screw 405 is provided at the inner end of the rod sleeve 401. Both ends of the first spring 403 respectively abut against the telescopic rod 402 and the end capping screw 405.

[0031] One end of the rod sleeve 401 is provided with a narrowing hole 406, and the telescopic rod 402 is provided with a large-diameter end 407. Under the action of the first spring 403, the large-diameter end 407 abuts against the narrowing part of the narrowing hole 406 to prevent it from coming out.

[0032] A supplementary rod section 404 can be placed inside the rod sleeve 401. Different lengths of supplementary rod sections 404 can be replaced according to the diameter of different optical fiber loops 8, so that the pressure of the first spring 403 is appropriate.

[0033] The length of the rod sleeve 401 extending out of the threaded hole can be adjusted.

[0034] In a preferred embodiment, a vertical seat 101 is provided at the upper end of the base 1. The first lifting member 6 and the second lifting member 7 are respectively slidably inserted into the vertical seat 101. Strip-shaped vertical grooves 901 are provided on both sides of the vertical seat 101. Locking screws 9 are provided at the lower ends of the first lifting member 6 and the second lifting member 7 respectively. The locking screws 9 pass through the strip-shaped vertical grooves 901 to be threadedly connected to the first lifting member 6 or the second lifting member 7.

[0035] Rotating each locking screw 9 can make the cap end of the locking screw 9 abut against the outer wall of the vertical seat 101 to lock the extending height of the first lifting member 6 and the second lifting member 7.

[0036] In a preferred embodiment, a threaded post 102 is provided on the base 1. A lifting nut 201 connected by threads is sleeved on the threaded post 102 and slides on the threaded post 102. The lower end of the positioning cone sleeve 2 abuts against the lifting nut 201.

[0037] Rotating the lifting nut 201 can adjust the positioning cone sleeve 2 to a suitable height.

[0038] In a preferred embodiment, a plugging hole 103 is provided at the upper end of the threaded post 102. A pressing frame 3 is further provided. The pressing frame 3 includes a magnetic block 301 and an inserting rod portion 302. The inserting rod portion 302 is inserted into the plugging hole 103. The magnetic block 301 attracts the upper end of the threaded post 102. Telescopic inclined rods 303 are provided at both ends of the pressing frame 3. A contact piece 304 is provided at the lower end of the telescopic inclined rod 303 and presses against the optical fiber loop 8.

[0039] Oblique through holes are provided at both ends of the pressing frame 3. The telescopic inclined rods 303 are screw rods, and the extending length can be locked by two relatively large nuts.

[0040] The contact piece 304 is a rubber block. After pressing against the optical fiber loop 8, the whole device can be placed horizontally, which is convenient for subsequent gluing and fixing the tail fiber.

[0041] In use, place the fiber optic loop 8 on the positioning cone sleeve 2, adjust the lifting nut 201 to an appropriate height, and align the azimuth marking portion 801 with the midline of the first ejector rod group 4 and the second ejector rod group 5. Insert the pressing frame 3, and adjust the obliquely extending rod 303 so that the contact piece 304 presses against the upper end surface of the fiber optic loop 8. Adjust the first lifting member 6 and the second lifting member 7 to an appropriate height so that the telescopic rod 402 abuts against the outer wall of the fiber optic loop 8. Pass the first pigtail 803 and the second pigtail 804 through the pigtail passing gap between the telescopic rods 402 of the second ejector rod group 5, and then through the pigtail passing gap between the telescopic rods 402 of the first ejector rod group 4. Slightly tighten the pigtail so that the outer wall of the pigtail contacts the outer wall of the telescopic rod 402, and the first pigtail 803 and the second pigtail 804 are in a symmetric state. At this time, merge the ends of the first pigtail 803 and the second pigtail 804. Place the device horizontally with the length direction of the azimuth marking portion 801 facing upward, apply glue to fix the re-merged section to form a glue application position 802. After solidification, retract the first lifting member 6 and the second lifting member 7, apply glue to fix at the starting point of the merging, and remove the fiber optic loop 8 after solidification.

[0042] Embodiment 2:

[0043] Polarization-maintaining fiber optic loops are mainly divided into skeleton fiber optic loops and non-skeleton fiber optic loops in terms of structure. High-precision fiber optic loops are generally of the non-skeleton type. The non-skeleton fiber optic loop consists of a loop body, a main boss, and pigtails. After the fiber optic loop is symmetrically wound from the midpoint of the optical fiber and completed, it ends at the main boss, and the two pigtails exit the fiber in opposite directions. The merging method provided by this method is that pigtail 1 walks a natural "S" shape with a curvature, and pigtail 2 walks a natural "O" shape with a curvature. The two pigtails coincide at the main boss and start to merge to improve the overall symmetry of the fiber optic loop. The schematic diagram is shown in the appendix Figure 8 . In this merging method, the merging points of the two pigtails are close to the main boss, and the distances from the winding end points of the two pigtails to the merging points are symmetric, which can well compensate for the asymmetry of the fiber optic loop caused by the existing merging method. For a polarization-maintaining fiber optic loop with an inner diameter of about 70 mm and a height of 15 mm, according to the appendix Figure 8 The merging method shown above can result in a difference in the lengths of the two pigtails of 20 cm.

[0044] Wind two polarization-maintaining fiber optic loops with a structure of an inner diameter of 70 mm, a height of 15 mm, and a length of 1500 m. Conduct a full-temperature zero-bias test once before merging; then conduct a full-temperature zero-bias test once after merging according to the method shown in the appendix Figure 8 above; then re-conduct a full-temperature zero-bias test once after merging according to the method shown in the appendix Figure 8 below, that is, the method provided by this solution. The results of the three tests are shown in the following table. It can be clearly seen from the test results that the full-temperature zero-bias performance of the merging method shown in the appendix Figure 8 above deteriorates significantly; the full-temperature zero-bias performance of the merging method provided by this solution remains basically the same as that before merging.

[0045]

[0046] The above embodiments are only the preferred technical solutions of the present utility model and should not be regarded as limitations to the present utility model. The protection scope of the present utility model shall be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present utility model.

Claims

1. An optical fiber loop pigtail attitude adjustment device, characterized in that: It includes a base (1). A positioning cone sleeve (2) is provided on the base (1). The positioning cone sleeve (2) is used to place an optical fiber ring (8). An independently liftable first lifting member (6) and a second lifting member (7) are provided on the base (1). A first ejector rod group (4) is provided at the upper end of the first lifting member (6), and a second ejector rod group (5) is provided at the upper end of the second lifting member (7). One end of the first ejector rod group (4) and the second ejector rod group (5) abuts against the outer wall of the optical fiber ring (8). Both the first ejector rod group (4) and the second ejector rod group (5) are provided with tail fiber passing gaps, and the tail fiber passing gap of the first ejector rod group (4) is smaller than that of the second ejector rod group (5).

2. The optical fiber loop pigtail attitude adjustment device according to claim 1, characterized in that: A chute part (601) is provided at the upper end of the first lifting member (6). Two symmetrically arranged sliding sleeves (602) are provided in the chute part (601). A first threaded hole cavity (603) is provided in the sliding sleeve (602). Both the first ejector rod group (4) and the second ejector rod group (5) include two ejector rod assemblies arranged in parallel at intervals. The ejector rod assembly includes a rod sleeve (401). A telescopically movable rod (402) is slidably sleeved in the rod sleeve (401). The telescopically movable rod (402) is used to contact the second ejector rod group (5). A second threaded hole cavity (701) is provided at the upper end of the second lifting member (7). The rod sleeve (401) of the first ejector rod group (4) is threadedly sleeved with the first threaded hole cavity (603), and the rod sleeve (401) of the second ejector rod group (5) is threadedly sleeved with the second threaded hole cavity (701). A vertical avoidance groove (702) is provided on the second lifting member (7). The avoidance groove (702) is used to avoid the first ejector rod group (4).

3. The optical fiber loop pigtail attitude adjustment device according to claim 2, wherein: A guide rod (604) and a screw rod (605) are provided on one side of the sliding sleeve (602). The guide rod (604) passes through and is slidably sleeved with the end wall of the chute part (601). The screw rod (605) passes through the end wall of the chute part (601) and a limit nut (606) is sleeved at the end in a threaded connection. A second spring (607) is sleeved on the guide rod (604). Both ends of the second spring (607) respectively abut against the sliding sleeve (602) and the inner wall of the chute part (601).

4. The fiber optic loop pigtail attitude adjustment device according to claim 2, characterized in that: A first spring (403) is provided in the rod sleeve (401). An end cap set screw (405) is provided at the inner end of the rod sleeve (401). Both ends of the first spring (403) respectively abut against the telescopically movable rod (402) and the end cap set screw (405).

5. The optical fiber loop pigtail attitude adjustment device according to claim 1, wherein: A vertical seat (101) is provided at the upper end of the base (1). The first lifting member (6) and the second lifting member (7) are respectively slidably inserted into the vertical seat (101). Strip-shaped vertical grooves (901) are provided on both sides of the vertical seat (101). Locking screws (9) are respectively provided at the lower ends of the first lifting member (6) and the second lifting member (7). The locking screws (9) pass through the strip-shaped vertical grooves (901) to be threadedly connected with the first lifting member (6) or the second lifting member (7).

6. The fiber optic loop pigtail attitude adjustment device according to claim 1, wherein: A threaded column (102) is provided on the base (1). A lifting nut (201) in threaded connection is sleeved on the threaded column (102). It slides on the threaded column (102), and the lower end of the positioning cone sleeve (2) abuts against the lifting nut (201).

7. The optical fiber loop pigtail attitude adjustment device according to claim 6, characterized in that: The upper end of the threaded post (102) is provided with a plugging hole (103), and a pressing frame (3) is also provided. The pressing frame (3) includes a magnetic block (301) and a plugging rod part (302). The plugging rod part (302) is inserted into the plugging hole (103), the magnetic block (301) attracts the upper end of the threaded post (102), both ends of the pressing frame (3) are provided with telescopic inclined extension rods (303), and the lower ends of the inclined extension rods (303) are provided with contact pieces (304) which press against the optical fiber ring (8).

Images