A method for preparing a skeleton-free optical fiber ring module for eliminating bonding stress

Abstract

The present invention relates to a method for preparing an optical fiber ring of an optical fiber gyroscope, and specifically to a method for preparing a skeleton-free optical fiber ring module that eliminates bonding stress, which is used to solve the shortcomings that the existing method for preparing an optical fiber ring module cannot fundamentally eliminate bonding stress, and the subsequent secondary bonding may lead to reduced performance of the optical fiber ring. The method for preparing a skeleton-free optical fiber ring module that eliminates bonding stress adopts a skeleton-free optical fiber ring module preparation tool that eliminates bonding stress, including a ring winding tool and a module structure tool. The ring winding tool is used to wind the optical fiber ring, which includes a first baffle, a fiber winding ring, and a second baffle, wherein the second baffle can be used as a lining plate of the module structure tool, thereby avoiding secondary bonding of the optical fiber ring and ensuring the performance of the optical fiber ring.

Description

Technical Field

[0001] The invention relates to a method for preparing an optical fiber ring of an optical fiber gyroscope, and in particular to a method for preparing a skeleton-free optical fiber ring module capable of eliminating bonding stress. Background Art

[0002] Fiber optic gyroscopes have the advantages of impact resistance, high sensitivity, long life, large dynamic range, and short startup time, and have been widely used in inertial navigation systems. The temperature problem is one of the key bottleneck technologies in the development of high-precision fiber optic gyroscopes. The fiber optic ring is greatly affected by temperature. A slight change in temperature will cause the internal stress of the fiber optic ring to change, resulting in a significant drift in the output of the fiber optic gyroscope. In order to reduce the impact of external temperature changes on the fiber optic ring, the fiber optic ring is usually wound using a multi-pole symmetrical winding method, so that the optical fibers at equal distances from the midpoint are in close proximity, thereby having nearly equal temperature and stress distribution.

[0003] After the fiber optic ring is made, it needs to be bonded. The bonding process is to fix one side of the fiber optic ring to the surface of the structural part. The fixing medium usually uses epoxy resin glue with strong bonding force. This bonding method maintains the all-solid structure of the traditional fiber optic gyroscope, which can ensure that the fiber optic gyroscope will not produce large output signal drift under strong vibration and impact environment. But another problem arises: the stress distribution of the fiber optic ring is not symmetrical. After bonding, only one side of the fiber optic ring is fixed to the structural part by epoxy resin glue. The optical fiber on the bonding surface is subjected to great stress, while the optical fiber in other positions is not affected by the bonding stress, which causes the symmetry of the stress distribution of the fiber optic ring to be destroyed, and ultimately affects the performance of the fiber optic gyroscope.

[0004] In order to improve the stress asymmetry caused by the bonding of the optical fiber ring, Chinese patents CN109405849A and CN109578401A proposed optimizing the bonding method of the optical fiber ring, and Chinese patent CN109141480A wound a layer of single-mode optical fiber on the bonding surface as a heat insulation layer. The above method has a certain effect on improving the bonding stress of the optical fiber ring, but it cannot fundamentally eliminate the bonding stress. After the winding and curing are completed, the optical fiber ring still needs to be removed from the ring winding tooling and bonded to the module structure for a second time. This step increases the possibility of reducing the performance of the optical fiber ring. Therefore, how to further eliminate the bonding stress and improve the performance of the optical fiber ring has become a problem that technicians in the field need to solve urgently. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings that the existing fiber optic ring module preparation method cannot fundamentally eliminate the bonding stress and the subsequent secondary bonding may lead to reduced performance of the fiber optic ring, and to provide a skeleton-free fiber optic ring module preparation method that eliminates the bonding stress.

[0006] In order to solve the deficiencies of the above-mentioned prior art, the present invention provides the following technical solutions:

[0007] A skeleton-free optical fiber ring module preparation tool for eliminating bonding stress, which is special in that it includes a ring winding tool and a module structure tool;

[0008] The ring winding tooling comprises a first baffle, a second baffle, and a fiber winding ring located between the first baffle and the second baffle, wherein a first annular groove for accommodating the optical fiber to be wound is formed between the first baffle, the second baffle and the outer side surface of the fiber winding ring;

[0009] The modular structural tooling is an integrated structure, including a first circular ring and a second circular ring arranged concentrically, and a bottom plate located on one side of the first circular ring and the second circular ring, and the end faces on the other side of the first circular ring and the second circular ring are flush; a second annular groove for accommodating the optical fiber ring is formed between the outer side surface of the first circular ring, the inner side surface of the second circular ring and the bottom plate, the axial length of the second annular groove is greater than the axial length of the first annular groove, and the inner diameter of the second annular groove is smaller than the inner diameter of the first annular groove.

[0010] Furthermore, the bottom plate is a circular flat plate arranged concentrically with the second circular ring, and the diameter of the bottom plate is the same as the outer diameter of the second circular ring.

[0011] Furthermore, the fiber winding ring includes two half rings.

[0012] Furthermore, the second baffle is in the shape of a circular flat plate having the same outer diameter as the bottom plate.

[0013] Furthermore, the fiber winding ring, the first baffle plate and the second baffle plate are fixed by screws.

[0014] At the same time, the present invention also provides a method for preparing a skeleton-free optical fiber ring module for eliminating bonding stress, which is special in that the skeleton-free optical fiber ring for eliminating bonding stress is used to prepare a tool, comprising the following steps:

[0015] Step (1): using a release agent to treat the contact surface between the first baffle and the optical fiber to be wound, and the contact surface between the fiber winding ring and the optical fiber to be wound, and performing sandblasting on the contact surface between the second baffle and the optical fiber to be wound;

[0016] Step (2): fixing the first baffle, the fiber winding ring and the second baffle to form a first annular groove for accommodating the optical fiber to be wound, and winding the optical fiber to be wound using a multi-pole symmetrical winding method;

[0017] Step (3): After curing the wound optical fiber ring, the first baffle and the fiber winding ring are removed;

[0018] Step (4): snap-fit ​​the second baffle plate of the bonded optical fiber ring to the module structure tooling so that the optical fiber ring is located in the second annular groove, and fix it to obtain a skeleton-free optical fiber ring module.

[0019] Furthermore, the second baffle is fixed to the module structure tooling by means of screws or welding.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The present invention discloses a skeleton-free optical fiber ring module preparation tool for eliminating bonding stress, including a ring winding tool and a module structure tool. The ring winding tool is used to wind the optical fiber ring, which includes a first baffle, a fiber winding ring and a second baffle, wherein the second baffle can be used as a lining plate of the module structure tool, thereby avoiding secondary bonding of the optical fiber ring and ensuring the performance of the optical fiber ring.

[0022] (2) Based on the above-mentioned preparation tooling for skeleton-free optical fiber ring modules that eliminates bonding stress, the present invention discloses a preparation method for skeleton-free optical fiber ring modules that eliminates bonding stress, which eliminates the bonding and curing process between the optical fiber ring and the structural parts in the existing method. The optical fiber ring module assembly can be completed by only one curing after the optical fiber ring is wrapped. The bonding stress generated by the bonding between the optical fiber ring and the structural parts is fundamentally eliminated, thereby greatly improving the performance of the optical fiber gyroscope. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a ring-winding tooling in an embodiment of a tooling for preparing a skeleton-free optical fiber ring module for eliminating bonding stress of the present invention;

[0024] Figure 2 It is a schematic diagram of the axonometric structure of the ring-wrapping tooling in an embodiment of the present invention;

[0025] Figure 3 It is a schematic diagram of the isometric structure of the modular structure tooling in an embodiment of the present invention;

[0026] Figure 4 It is a structural schematic diagram of a modular structure tooling in an embodiment of the present invention;

[0027] Figure 5 for Figure 4 AA section view.

[0028] The reference numerals are explained as follows: 1-ring tooling, 11-first baffle, 12-second baffle, 13-fiber ring, 14-first annular groove; 2-module structure tooling, 21-first circular ring, 22-second circular ring, 23-bottom plate, 24-second annular groove. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings and exemplary embodiments.

[0030] Reference Figures 1 to 5 A skeleton-free optical fiber ring module preparation tool for eliminating bonding stress includes a ring winding tool 1 and a module structure tool 2.

[0031] The ring winding tool 1 includes a fiber winding ring 13, and a first baffle 11 and a second baffle 12 located on both sides of the fiber winding ring 13. The fiber winding ring 13 includes two half rings. The fiber winding ring 13, the first baffle 11 and the second baffle 12 are fixed by screws. A first annular groove 14 for accommodating the optical fiber to be wound is formed between the first baffle 11, the second baffle 12 and the outer side surface of the fiber winding ring 13.

[0032] The modular structure tooling 2 is an integrated structure, including a first circular ring 21 and a second circular ring 22 arranged concentrically, and a bottom plate 23 located on one side of the first circular ring 21 and the second circular ring 22. The bottom plate 23 is a circular flat plate arranged concentrically with the second circular ring 22. The diameter of the bottom plate 23 is the same as the outer diameter of the second circular ring 22. A second annular groove 24 for accommodating the optical fiber ring is formed between the outer side surface of the first circular ring 21, the inner side surface of the second circular ring 22 and the bottom plate 23.

[0033] The second baffle plate 12 is a circular flat plate having the same outer diameter as the bottom plate 23 .

[0034] Based on the above-mentioned preparation tool for skeleton-free optical fiber ring module for eliminating bonding stress, the present invention provides a preparation method for skeleton-free optical fiber ring module for eliminating bonding stress, comprising the following steps:

[0035] Step (1): using a release agent to treat the contact surface between the first baffle 11 and the optical fiber to be wound, and the contact surface between the fiber winding ring 13 and the optical fiber to be wound, so as to facilitate the removal of the first baffle 11 and the fiber winding ring 13 in step (3); sandblasting the contact surface between the second baffle 12 and the optical fiber to be wound, so as to make the bonding more firm;

[0036] Step (2): fixing the first baffle 11, the second baffle 12 and the fiber winding ring 13 by screws to form a first annular groove 14 for accommodating the optical fiber to be wound, and winding the optical fiber to be wound by a multi-pole symmetrical winding method;

[0037] Step (3): After curing the wound optical fiber ring, the first baffle 11 and the fiber winding ring 13 are removed;

[0038] Step (4): snap the second baffle 12 of the bonded optical fiber ring into place with the module structure fixture 2, so that the optical fiber ring is located in the second annular groove 24 and does not contact the inner surface of the second annular groove 24, and fix the second baffle 12 and the module structure fixture 2 with screws to obtain a skeleton-free optical fiber ring module.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. For ordinary professional and technical personnel in the field, the specific technical solutions recorded in the aforementioned embodiments can be modified, or some of the technical features therein can be replaced by equivalents, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions protected by the present invention.

Claims

1. A method for preparing a skeleton-free optical fiber ring module for eliminating bonding stress, characterized in that: A skeleton-free optical fiber ring preparation tool is used to eliminate bonding stress. The skeleton-free optical fiber ring preparation tool comprises a ring winding tool (1) and a module structure tool (2); The ring winding tool (1) comprises a first baffle (11), a second baffle (12), and a fiber winding ring (13) located between the first baffle (11) and the second baffle (12); a first annular groove (14) for accommodating the optical fiber to be wound is formed between the first baffle (11), the second baffle (12) and the outer side surface of the fiber winding ring (13); The modular structure tooling (2) is an integrated structure, comprising a first circular ring (21), a second circular ring (22) which are arranged concentrically, and a bottom plate (23) located on one side of the first circular ring (21) and the second circular ring (22), the end surfaces of the first circular ring (21) and the second circular ring (22) on the other side being flush; a second circular groove (24) for accommodating the optical fiber ring is formed between the outer side surface of the first circular ring (21), the inner side surface of the second circular ring (22) and the bottom plate (23); the axial length of the second circular groove (24) is greater than the axial length of the first circular groove (14), and the inner diameter of the second circular groove (24) is smaller than the inner diameter of the first circular groove (14); The method for preparing the skeleton-free optical fiber ring module comprises the following steps: Step (1): using a release agent to treat the contact surface between the first baffle (11) and the optical fiber to be wound, and the contact surface between the fiber winding ring (13) and the optical fiber to be wound, and performing sandblasting on the contact surface between the second baffle (12) and the optical fiber to be wound; Step (2): fixing the first baffle (11), the second baffle (12) and the fiber winding ring (13) to form a first annular groove (14) for accommodating the optical fiber to be wound, and winding the optical fiber to be wound using a multi-pole symmetrical winding method; Step (3): after curing the wound optical fiber ring, removing the first baffle (11) and the fiber winding ring (13); Step (4): snap-fitting the second baffle (12) for bonding the optical fiber ring to the module structure tooling (2) so that the optical fiber ring is located in the second annular groove (24), and fixing the optical fiber ring to obtain a skeleton-free optical fiber ring module.

2. The method for preparing a skeleton-free optical fiber ring module for eliminating bonding stress according to claim 1, characterized in that: The second baffle (12) is fixed to the module structure tooling (2) by means of screws or welding.

3. The method for preparing a skeleton-free optical fiber ring module for eliminating bonding stress according to claim 1, characterized in that: The bottom plate (23) is a circular flat plate arranged concentrically with the second circular ring (22), and the diameter of the bottom plate (23) is the same as the outer diameter of the second circular ring (22).

4. The method for preparing a skeleton-free optical fiber ring module for eliminating bonding stress according to claim 3, characterized in that: The fiber winding ring (13) comprises two half rings.

5. The method for preparing a skeleton-free optical fiber ring module for eliminating bonding stress according to claim 4, characterized in that: The second baffle plate (12) is a circular flat plate having the same outer diameter as the bottom plate (23).

6. The method for preparing a skeleton-free optical fiber ring module for eliminating bonding stress according to claim 5, characterized in that: The first baffle plate (11), the second baffle plate (12) and the fiber winding ring (13) are fixed by means of screws.

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