Adjustable optical fiber strain device
By setting strain grooves and sliding grooves on the strain gauge of the fiber strain device and tensile fiber grating with the adjustment component, the problem of inconsistent initial wavelength of the fiber strain device is solved, and convenient disassembly and wavelength adjustment of the fiber grating is achieved.
Patent Information
- Application Number
- CN202421387778.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-17
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-06-17
AI Technical Summary
The initial wavelength of existing fiber strain devices is inconsistent, and when the fiber is replaced after it is broken, all the strain gauges need to be removed and replaced, so the wavelength cannot be adjusted.
An adjustable fiber strain device is designed, including a strain gauge, a fiber grating and a first adjustment assembly. The first strain groove and the first sliding groove are provided on the strain gauge, and the first adjustment component fixes the optical fiber grating on the strain gauge through the first fixing block and the first connecting member, and stretches the optical fiber grating by sliding the first fixing block and adjusts the fiber grating. Initial wavelength.
The initial wavelength adjustment of the fiber grating is realized, which facilitates the disassembly and assembly of the fiber grating, and improves the flexibility and convenience of the device.
Smart Images
Figure CN222505319U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of optical fiber sensors, and more specifically, to an adjustable optical fiber strain device. Background Art
[0002] Fiber Bragg grating strain devices are a type of fiber optic sensor with a wide range of applications. When the strain device changes, the fiber material is affected by the grating period length and the photoelastic effect, which causes the wavelength to change. The wavelength changes linearly with the strain.
[0003] In existing devices of this type, the strain optical fiber is directly connected to the strain gauge, and the initial wavelength is inconsistent due to the connection method and operation restrictions. When replacing the optical fiber after it breaks, the strain gauge must be completely disassembled and replaced, and the wavelength cannot be adjusted. Utility Model Content
[0004] In order to solve the problem of inconsistent initial wavelengths of an optical fiber strain device, the utility model provides an adjustable optical fiber strain device, comprising a strain gauge, an optical fiber Bragg grating and a first adjustment component; the strain gauge comprises a first strain groove and a first sliding groove, and the first sliding groove and the first strain groove are distributed along the length direction of the strain gauge; the first adjustment component comprises a first fixed block and a first connecting member, and the first fixed block is assembled in the first sliding groove through the first connecting member; the optical fiber Bragg grating is arranged along the length direction of the strain gauge and is fixed to the first fixed block, and the optical fiber Bragg grating crosses the first strain groove and is fixed to the other side of the first strain groove; the first fixed block is driven by the first connecting member to slide in the first sliding groove, and stretches the optical fiber Bragg grating to adjust the initial wavelength of the optical fiber Bragg grating.
[0005] Preferably, the strain gauge further includes a second strain groove and a third strain groove, the first strain groove, the second strain groove and the third strain groove are spaced apart on the strain gauge along the length direction, and the second strain groove and the third strain groove are respectively located on both sides of the first strain groove, and the first sliding groove is located between the first strain groove and the second strain groove; when the strain gauge is stretched, the strain gauge generates plastic deformation at the first strain groove, the second strain groove and the third strain groove, so that the fiber Bragg grating is stretched.
[0006] Preferably, the strain gauge further comprises a second sliding groove, and the second sliding groove is located between the first strain groove and the third strain groove;
[0007] The adjustable optical fiber strain device includes a second adjustment component, the second adjustment component includes a second fixed block and a second connecting member, and the second fixed block is assembled in the second sliding groove through the second connecting member; the optical fiber Bragg grating is fixed to the second fixed block; the second fixed block is driven by the second connecting member to slide in the first sliding groove and the second sliding groove and stretch the optical fiber Bragg grating.
[0008] Preferably, a first through groove is provided on the upper surface of the first fixing block, and a second through groove is provided on the upper surface of the second fixing block, and both ends of the grating area of the fiber grating are respectively accommodated in the first through groove and the second through groove and are bonded and fixed to the first fixing block and the second fixing block by an adhesive, and the first through groove and the second through groove are respectively arranged along the length direction of the strain gauge.
[0009] Preferably, the first strain groove, the second strain groove and the third strain groove are all waist-shaped grooves, and the two ends of the waist-shaped groove extend out of the two sides of the strain gauge in the width direction respectively, and the partial groove walls of the waist-shaped groove extending out of the two sides of the strain gauge are arc-shaped and connected to the two side walls of the strain gauge.
[0010] Preferably, the first sliding groove and the second sliding groove are respectively connected to the first strain groove;
[0011] The strain gauge further includes a first through hole and a second through hole, wherein the first through hole penetrates through the groove walls of the first sliding groove and the second strain groove, and the second through hole penetrates through the groove walls of the third strain groove and the second sliding groove, and the first through hole and the second through hole are arranged on the same straight line along the length direction of the strain gauge;
[0012] The first connecting member includes a first screw and a first nut, one end of the first screw is fixedly connected to the first fixing block, and the other end of the first screw passes through the first through hole and is threadedly connected to the first nut in the second strain groove;
[0013] The second connecting member includes a second screw and a second nut, one end of the second screw is fixedly connected to the second fixing block, and the other end of the second screw passes through the second through hole and is threadedly connected to the second nut in the third strain groove.
[0014] Preferably, the first sliding groove and the second sliding groove are respectively connected to the first strain groove;
[0015] The strain gauge further includes a first through hole and a second through hole, wherein the first through hole penetrates through the groove walls of the first sliding groove and the second strain groove, and the second through hole penetrates through the groove walls of the third strain groove and the second sliding groove, and the first through hole and the second through hole are arranged on the same straight line along the length direction of the strain gauge;
[0016] The first connecting member includes a first screw, the first fixing block is provided with a first threaded hole, the first screw passes through the first through hole and is threadedly connected to the first threaded hole to assemble the first fixing block in the first sliding groove;
[0017] The second connecting member includes a second screw, and the second fixing block is provided with a second threaded hole. The second screw passes through the second through hole and is threadedly connected with the second threaded hole to assemble the second fixing block in the second sliding groove.
[0018] Preferably, the first adjustment component further includes a first spring, the first spring is sleeved on the main body of the first connecting member, and two ends of the first spring are respectively pressed against the first fixing block and the inner wall of the first sliding groove.
[0019] Compared with the prior art, the utility model has the following beneficial effects: by arranging a first strain groove on the strain gauge, fixing the fiber Bragg grating above the first strain groove through a first adjustment group, and performing stretching adjustment on the fiber Bragg grating, not only the initial wavelength of the fiber Bragg grating can be adjusted, but also the disassembly and assembly of the fiber Bragg grating is convenient. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 is an exploded view of an adjustable optical fiber strain device according to an embodiment of the present application;
[0021] Figure 2 is another exploded view of the adjustable optical fiber strain device according to an embodiment of the present application;
[0022] Figure 3 is an overall structural diagram of an adjustable optical fiber strain device according to an embodiment of the present application;
[0023] Figure 4 is another structural schematic diagram of the first connecting member and the second connecting member of the adjustable optical fiber strain device according to an embodiment of the present application;
[0024] Figure 5 It is an enlarged view of the connection portion between the optical fiber and the first fixing block of the adjustable optical fiber strain device in the embodiment of the present application.
[0025] Description of Reference Numerals
[0026] 1. strain gauge; 11. first strain slot; 12. first sliding slot; 13. second strain slot; 14. third strain slot; 15. second sliding slot; 2. fiber grating; 3. first adjustment component; 31. first fixing block; 311. first through slot; 32. first connecting member; 33. first spring; 4. second adjustment component; 41. second fixing block; 411. second through slot; 42. second connecting member. DETAILED DESCRIPTION
[0027] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0028] like Figure 1-5 As shown, the adjustable optical fiber strain device disclosed by the utility model.
[0029] See also Figure 1 The adjustable optical fiber strain device of this embodiment includes a strain gauge 1, an optical fiber Bragg grating 2 and a first adjustment component 3 (see Figure 3 The strain gauge 1 is in a flat strip shape and can be made of metal materials such as stainless steel. The fiber grating 2 is fixed to the strain gauge 1 through a first adjustment component 3 .
[0030] The strain gauge 1 comprises a first strain groove 11 and a first sliding groove 12, the first sliding groove 12 and the first strain groove 11 are distributed along the length direction of the strain gauge 1, and the first sliding groove 12 is also arranged along the length direction of the strain gauge 1. The first adjustment assembly 3 comprises a first fixing block 31 and a first connecting member 32, and the first fixing block 31 is assembled in the first sliding groove 12 through the first connecting member 32; the fiber Bragg grating 2 is arranged along the length direction of the strain gauge 1 and is fixed to the first fixing block 31, that is, at least a part of the fiber Bragg grating 2 is assembled to the strain gauge 1 through the first fixing block 31, and the fiber Bragg grating 2 crosses the first strain groove 11 and is fixed to the other side of the first strain groove 11, that is, the fiber Bragg grating 2 is arranged parallel to the length direction of the strain gauge 1 and is directly above the strain gauge 1, so that the grating area of the fiber Bragg grating 2 is located directly above the first strain groove 11.
[0031] The first fixing block 31 is driven by the first connecting member 32 to slide in the first sliding groove 12 (ie, slide along the length direction of the strain gauge 1 ), and stretches the fiber Bragg grating 2 to change the wavelength of the fiber Bragg grating 2 , thereby adjusting the initial wavelength of the fiber Bragg grating 2 .
[0032] In one embodiment of the utility model, the strain gauge 1 further includes a second strain groove 13 and a third strain groove 14. The first strain groove 11, the second strain groove 13 and the third strain groove 14 are spaced apart along the length direction on the strain gauge 1, that is, they are arranged in parallel along the length direction of the fiber Bragg grating 2, and the second strain groove 13 and the third strain groove 14 are respectively located on both sides of the first strain groove 11, and the first sliding groove 12 is located between the first strain groove 11 and the second strain groove 13, which can maintain a uniform distribution on both sides of the first strain groove 11 and improve the protection of the first strain groove 11; when the strain gauge 1 is stretched, the strain gauge 1 generates plastic deformation at the first strain groove 11, the second strain groove 13 and the third strain groove 14, so that the fiber Bragg grating 2 is stretched, thereby realizing the wavelength change while protecting the fiber Bragg grating 2, and preventing the fiber Bragg grating 2 from being damaged due to excessive force.
[0033] The above structure can improve the deformation capacity of the strain gauge 1. Specifically, the sum of the plastic deformation capacities of the second strain groove 13 and the third strain groove 14 is greater than the plastic deformation capacity of the first strain groove 11, thereby increasing the plastic deformation area of the strain gauge 1 and dispersing the plastic deformation of the strain gauge 1, thereby avoiding the situation where the fiber Bragg grating 2 is broken due to excessive local deformation, and improving the service life of the fiber Bragg grating 2.
[0034] In one embodiment of the present invention, the strain gauge 1 further includes a second sliding groove 15 (see Figure 2 ), the second sliding groove 15 is located between the first strain groove 11 and the third strain groove 14, and the second sliding groove 15 and the first sliding groove 12 are distributed on both sides of the first strain groove 11 along the length direction of the strain gauge 1; the adjustable optical fiber strain device includes a second adjustment component 4, the second adjustment component 4 includes a second fixing block 41 and a second connecting member 42, and the second fixing block 41 is assembled in the second sliding groove 15 through the second connecting member 42; the two ends of the optical fiber Bragg grating 2 are respectively fixed to the first fixing block 31 and the second fixing block 41, and are assembled on the strain gauge 1 through the first fixing block 31 and the second fixing block 41, so that the grating area of the optical fiber Bragg grating 2 is located at the first strain groove 11 Directly above, the second fixing block 41 is driven by the second connecting member 42 to slide in the first sliding groove 12 and the second sliding groove 15 and stretch the fiber Bragg grating 2. The two ends of the fiber Bragg grating 2 can be fixed by the first fixing block 31 and the second fixing block 41 respectively, which can increase the connection stability between the fiber Bragg grating 2 and the strain gauge 1, and the wavelength of the fiber Bragg grating 2 can be adjusted by the first fixing block 31 or the second fixing block 41, thereby improving the wavelength adjustability of the fiber Bragg grating 2; and when the fiber Bragg grating 2 is broken, the first fixing block 31 and the second fixing block 41 can be directly disassembled and replaced without disassembling and replacing all the strain gauges 1, thereby facilitating the convenience of replacing the fiber Bragg grating 2.
[0035] Specifically, the first fixed block 31 and the second fixed block 41 are both in the shape of a cuboid, and the first sliding groove 12 and the second sliding groove 15 are also in the shape of a cuboid accordingly, and the outer walls of the first fixed block 31 and the second fixed block 41 are respectively pressed against the inner walls of the first sliding groove 12 and the second sliding groove 15, so as to realize the connection limit of the first fixed block 31 and the second fixed block 41 and improve the connection stability between the first fixed block 31 and the second fixed block 41 and the strain gauge 1.
[0036] In one embodiment of the present invention, a first through slot 311 is provided on the upper surface of the first fixing block 31, and a second through slot 411 is provided on the upper surface of the second fixing block 41 (see Figure 2 ), both ends of the grating area of the fiber Bragg grating 2 are respectively accommodated in the first through groove 311 and the second through groove 411 and are bonded and fixed to the first fixing block 31 and the second fixing block 41 by an adhesive, and the first through groove 311 and the second through groove 411 are respectively arranged along the length direction of the strain gauge 1. Specifically, the adhesive can be epoxy resin glue or UV glue, which has a simple structure, is easy to operate, and has strong viscosity, so as to realize a stable connection between the fiber Bragg grating 2 and the first fixing block 31 and the second fixing block 41.
[0037] In one embodiment of the utility model, the first strain groove 11, the second strain groove 13 and the third strain groove 14 are all waist-shaped grooves, so that the stress on the strain gauge 1 is more concentrated; the two ends of the waist-shaped groove extend out of the two sides of the width direction of the strain gauge 1, respectively, thereby increasing the plastic deformation capacity of the first strain groove 11, the second strain groove 13 and the third strain groove 14, and improving the structural stability of the strain gauge 1; and the groove walls of the waist-shaped groove extending out of the two sides of the strain gauge 1 are arc-shaped and connected to the two side walls of the strain gauge 1. The arc connection can ensure that the protruding two ends of the waist-shaped groove have no corners, so that the deformation zone is more evenly stressed, thereby avoiding the situation where the corners are subjected to excessive stress and cracking, and improving the service life of the strain gauge 1.
[0038] In one embodiment of the utility model, the first sliding groove 12 and the second sliding groove 15 are respectively connected to the first strain groove 11; the strain gauge 1 also includes a first through hole and a second through hole, the first through hole penetrates the groove wall of the first sliding groove 12 and the second strain groove 13, and the second through hole penetrates the groove wall of the third strain groove 14 and the second sliding groove 15, and the first through hole and the second through hole are arranged on the same straight line along the length direction of the strain gauge 1; the first connecting member 32 includes a first screw and a first nut (see Figure 2), one end of the first screw is fixedly connected to the first fixing block 31, the other end of the first screw passes through the first through hole and is threadedly connected to the first nut in the second strain groove 13, and the first screw is arranged in parallel along the length direction of the fiber grating 2; the second connecting member 42 includes a second screw and a second nut, one end of the second screw is fixedly connected to the second fixing block 41, the other end of the second screw passes through the second through hole and is threadedly connected to the second nut in the third strain groove 14, the connection method of the screw and the nut is simple and convenient, which can improve the efficiency of installation and disassembly of the first fixing block 31 and the second fixing block 41 and the strain gauge 1, and the materials of the screw and the nut are easy to obtain, which can reduce the production cost of the adjustable optical fiber strain device.
[0039] In one embodiment of the utility model, the first sliding groove 12 and the second sliding groove 15 are respectively connected to the first strain groove 11; the strain gauge 1 also includes a first through hole and a second through hole, the first through hole penetrates the groove wall of the first sliding groove 12 and the second strain groove 13, and the second through hole penetrates the groove wall of the third strain groove 14 and the second sliding groove 15, and the first through hole and the second through hole are arranged on the same straight line along the length direction of the strain gauge 1; the first connecting member 32 includes a first screw, and the first fixing block 31 is provided with a first threaded hole (see Figure 4 ), the first screw passes through the first through hole and is threadedly connected to the first threaded hole to assemble the first fixing block 31 in the first sliding groove 12; the second connecting member 42 includes a second screw, and the second fixing block 41 is provided with a second threaded hole. The second screw passes through the second through hole and is threadedly connected to the second threaded hole to assemble the second fixing block 41 in the second sliding groove 15. The connection method of the screw and the threaded hole is simple and convenient, which can improve the efficiency of installation and disassembly of the first fixing block 31 and the second fixing block 41 and the strain gauge 1, and the screw material is easy to obtain, which can reduce the production cost of the adjustable optical fiber strain device.
[0040] In one embodiment of the utility model, the first adjustment component 3 also includes a first spring 33, the first spring 33 is sleeved on the main body of the first connecting member 32, and the two ends of the first spring 33 are respectively pressed against the first fixed block 31 and the inner wall of the first sliding groove 12; the second adjustment component 4 also includes a second spring, the second spring is sleeved on the main body of the second connecting member 42, and the two ends of the second spring are respectively pressed against the second fixed block 41 and the inner wall of the second sliding groove 15. When the first fixing block 31 and the second fixing block 41 are connected to the strain gauge 1, the first spring 33 and the second spring are squeezed to store elastic potential energy, so that when the first fixing block 31 and the second fixing block 41 adjust the wavelength of the fiber grating, the first spring 33 and the second spring can push the first fixing block 31 and the second fixing block 41 towards each other by releasing the elastic potential energy, thereby facilitating the adjustment of the first fixing block 31 and the second fixing block 41, avoiding the situation where the first fixing block 31 and the second fixing block 41 are too tightly connected to the strain gauge 1 and are stuck, and improving the convenience of adjustment between the first fixing block 31 and the second fixing block 41 and the strain gauge 1.
[0041] The above are only preferred specific implementations of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.
Claims
1. An adjustable optical fiber strain device, characterized in that: The invention comprises a strain gauge, a fiber Bragg grating (FBG) and a first adjustment component; the strain gauge comprises a first strain groove and a first sliding groove, and the first sliding groove and the first strain groove are distributed along the length direction of the strain gauge; the first adjustment component comprises a first fixed block and a first connecting member, and the first fixed block is assembled in the first sliding groove through the first connecting member; the fiber Bragg grating (FBG) is arranged along the length direction of the strain gauge and is fixed to the first fixed block, and the fiber Bragg grating (FBG) crosses the first strain groove and is fixed to the other side of the first strain groove; the first fixed block is driven by the first connecting member to slide in the first sliding groove, and stretches the fiber Bragg grating (FBG) to adjust the initial wavelength of the fiber Bragg grating.
2. The adjustable optical fiber strain device according to claim 1, characterized in that: The strain gauge further includes a second strain groove and a third strain groove, wherein the first strain groove, the second strain groove and the third strain groove are spaced apart on the strain gauge along the length direction, and the second strain groove and the third strain groove are respectively located on both sides of the first strain groove, and the first sliding groove is located between the first strain groove and the second strain groove; when the strain gauge is stretched, the strain gauge generates plastic deformation at the first strain groove, the second strain groove and the third strain groove, so that the fiber Bragg grating is stretched.
3. The adjustable optical fiber strain device according to claim 2, characterized in that: The strain gauge further includes a second sliding groove, and the second sliding groove is located between the first strain groove and the third strain groove; The adjustable optical fiber strain device includes a second adjustment component, the second adjustment component includes a second fixed block and a second connecting member, and the second fixed block is assembled in the second sliding groove through the second connecting member; the optical fiber Bragg grating is fixed to the second fixed block; the second fixed block is driven by the second connecting member to slide in the first sliding groove and the second sliding groove and stretch the optical fiber Bragg grating.
4. The adjustable optical fiber strain device according to claim 3, characterized in that: A first through groove is provided on the upper surface of the first fixing block, and a second through groove is provided on the upper surface of the second fixing block. Both ends of the grating area of the fiber grating are respectively accommodated in the first through groove and the second through groove and are bonded and fixed to the first fixing block and the second fixing block by adhesive. The first through groove and the second through groove are respectively arranged along the length direction of the strain gauge.
5. The adjustable optical fiber strain device according to claim 2, characterized in that: The first strain groove, the second strain groove and the third strain groove are all waist-shaped grooves, and the two ends of the waist-shaped groove extend out of the two sides of the strain gauge in the width direction respectively, and the groove walls of the waist-shaped groove extending out of the two sides of the strain gauge are arc-shaped and connected to the two side walls of the strain gauge.
6. The adjustable optical fiber strain device according to claim 3, characterized in that: The first sliding groove and the second sliding groove are respectively connected to the first strain groove; The strain gauge further includes a first through hole and a second through hole, wherein the first through hole penetrates through the groove walls of the first sliding groove and the second strain groove, and the second through hole penetrates through the groove walls of the third strain groove and the second sliding groove, and the first through hole and the second through hole are arranged on the same straight line along the length direction of the strain gauge; The first connecting member includes a first screw and a first nut, one end of the first screw is fixedly connected to the first fixing block, and the other end of the first screw passes through the first through hole and is threadedly connected to the first nut in the second strain groove; The second connecting member includes a second screw and a second nut, one end of the second screw is fixedly connected to the second fixing block, and the other end of the second screw passes through the second through hole and is threadedly connected to the second nut in the third strain groove.
7. The adjustable optical fiber strain device according to claim 3, characterized in that: The first sliding groove and the second sliding groove are respectively connected to the first strain groove; The strain gauge further includes a first through hole and a second through hole, wherein the first through hole penetrates through the groove walls of the first sliding groove and the second strain groove, and the second through hole penetrates through the groove walls of the third strain groove and the second sliding groove, and the first through hole and the second through hole are arranged on the same straight line along the length direction of the strain gauge; The first connecting member includes a first screw, the first fixing block is provided with a first threaded hole, the first screw passes through the first through hole and is threadedly connected to the first threaded hole to assemble the first fixing block in the first sliding groove; The second connecting member includes a second screw, and the second fixing block is provided with a second threaded hole. The second screw passes through the second through hole and is threadedly connected with the second threaded hole to assemble the second fixing block in the second sliding groove.
8. The adjustable optical fiber strain device according to claim 1, characterized in that: The first adjustment component also includes a first spring, which is sleeved on the main body of the first connecting member, and two ends of the first spring are respectively pressed against the first fixing block and the inner wall of the first sliding groove.