Fiber bragg grating embedded strain sensor

Abstract

The utility model discloses a fiber bragg grating embedded strain sensor, which belongs to the technical field of sensors and comprises an optical cable, and a main body assembly is arranged on the outer side of the optical cable. According to the utility model, through the arrangement of the fixed storage device, a worker can carry out auxiliary fixation on the position of the sensor through the cooperation of a screw rod, an insertion cone and other structures when needed, so that the possibility of accidental movement of the sensor is reduced; a worker can store the redundant length part of the optical cable through the cooperation of the storage box, the pressing frame and other structures when needed, so that the working capability of the sensor is improved; according to the utility model, through the arrangement of the isolation protection device, a worker can carry out certain isolation protection on the structures such as the strain gauge housing through the cooperation of the structures such as the protection housing when the worker does not work, thereby reducing the possibility that the structures such as the strain gauge housing are accidentally damaged, and further improving the practicability of the sensor.

Description

Technical Field

[0001] This utility model belongs to the field of sensor technology, specifically relating to a fiber optic grating embedded strain sensor. Background Technology

[0002] A sensor is a detection device that can sense the information being measured and transform the sensed information into an electrical signal or other required form of information output according to certain rules, so as to meet the requirements of information transmission, processing, storage, display, recording and control.

[0003] Chinese patent application number 202322582357.2 discloses a tensile-resistant embedded fiber Bragg grating strain sensor, comprising an optical cable including exposed fiber portions and non-exposed fiber portions. The exposed fiber portions of the optical cable are etched with gratings to form fiber Bragg grating regions. The tensile-resistant embedded fiber Bragg grating strain sensor also includes a strain housing, two metal tubes, two strain gauge housings, and protective components. By employing a threaded connection and crimping process between the sensor and the optical cable for tensile resistance, compared to conventional adhesive bonding, the tensile strength of the sensor is increased, improving its environmental resistance in harsh environments. The integrated packaging enhances the structural reliability of the product, reduces environmental damage to the sensor, and extends its service life.

[0004] 1. The aforementioned patent has the problem that it is inconvenient to assist in fixing the position of the sensor when needed, and it is inconvenient to store the excess length of the optical cable when needed, thereby reducing the working capacity of the sensor; 2. The aforementioned patent has the problem that it is inconvenient to protect the strain gauge housing and other structures when not in operation, thereby reducing the practicality of the sensor. Utility Model Content

[0005] To address the problems mentioned in the background section, this invention provides a fiber optic grating embedded strain sensor, which features high performance and strong practicality.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a fiber optic grating embedded strain sensor, comprising an optical cable, a main body assembly disposed on the outer side of the optical cable, tail sleeve assemblies mounted on both sides of the main body assembly, two strain gauge housings mounted on the outer side of the main body assembly, a fixing and storage device disposed on the outer side of the tail sleeve assembly, and an isolation and protection device disposed on the outer side of the two strain gauge housings.

[0007] Preferably, the fixed storage device includes a base box, a lifting plate, a cone, a storage component, and a screw. The base box is installed below the strain gauge housing, and the screw is threaded onto the top of the base box. The lifting plate is installed below the screw and inside the base box via a bearing. Multiple cones are installed below the lifting plate. The storage component is installed above the base box and on the side of the tail assembly away from the main assembly and outside the optical cable.

[0008] Preferably, the shape and size of the inner cross-section of the base box are the same as the shape and size of the outer cross-section of the lifting plate.

[0009] Preferably, the storage assembly includes a support block, a pressing frame, a lead screw, and a storage box. The support block is installed above the bottom box and on the side of the tail assembly away from the main body assembly and below the optical cable. The storage box is installed above the support block and on the outside of the optical cable. The lead screw is installed above the storage box via a bearing, and the pressing frame is installed on the outside of the lead screw via a thread.

[0010] Preferably, the isolation and protection device includes a protective shell and a limiting component. The protective shell is provided on the outer side of the two strain gauge shells, and the two strain gauge shells are connected to the protective shell through two limiting components.

[0011] Preferably, the limiting component includes an inner cavity, a locking block, a compression spring, a connecting sleeve, and a connecting block. A connecting block is installed above the strain gauge housing, and two connecting sleeves are installed on the top of the protective shell and outside the two connecting blocks. An inner cavity is opened on the inner side of the connecting block, a compression spring is installed on the inner side of the inner cavity, and a locking block is installed on one side of the compression spring.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This utility model, by setting up a fixed storage device, allows staff to use screws and cones to assist in fixing the position of the sensor when needed, thereby reducing the possibility of accidental movement of the sensor. Furthermore, staff can use storage boxes and pressing frames to store excess length of the optical cable when needed, thus improving the working capacity of the sensor.

[0014] 2. By setting up an isolation and protection device, this utility model enables staff to isolate and protect the strain gauge housing and other structures in the presence of protective shells when not in use, thereby reducing the possibility of accidental damage to the strain gauge housing and other structures, and thus improving the practicality of the sensor. Attached Figure Description

[0015] Figure 1 This is a perspective view of the present utility model;

[0016] Figure 2 This is a three-dimensional sectional view of the present invention;

[0017] Figure 3 This is a perspective sectional view of the fixed storage device of this utility model;

[0018] Figure 4 This is a three-dimensional sectional view of the isolation and protection device of this utility model.

[0019] In the diagram: 1. Main component; 2. Strain gauge housing; 3. Fixed storage device; 31. Base box; 32. Lifting plate; 33. Insert cone; 34. Storage component; 341. Support block; 342. Pressing frame; 343. Lead screw; 344. Storage box; 35. Screw; 4. Isolation and protection device; 41. Protective shell; 42. Limiting component; 421. Inner cavity; 422. Locking block; 423. Compression spring; 424. Connecting sleeve; 425. Connecting block; 5. Optical cable; 6. Tail sleeve component. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0021] Please see Figure 1-4 The present invention provides the following technical solution: a fiber optic grating embedded strain sensor, including an optical cable 5, a main body component 1 on the outside of the optical cable 5, tail sleeve components 6 on both sides of the main body component 1, two strain gauge housings 2 on the outside of the main body component 1, a fixing and storage device 3 on the outside of the tail sleeve components 6, and an isolation and protection device 4 on the outside of the two strain gauge housings 2.

[0022] Specifically, the fixed storage device 3 includes a base box 31, a lifting plate 32, a cone 33, a storage component 34, and a screw 35. The base box 31 is installed below the strain gauge housing 2. The screw 35 is installed on the top of the base box 31 by threads. The lifting plate 32 is installed below the screw 35 and inside the base box 31 by bearings. Multiple cones 33 are installed below the lifting plate 32. The storage component 34 is installed above the base box 31 and on the side of the tail sleeve assembly 6 away from the main body assembly 1 and outside the optical cable 5.

[0023] By adopting the above technical solution, staff can use the screw 35 and the cone 33 to fix the position of the sensor when needed, thereby reducing the possibility of the sensor moving unexpectedly.

[0024] Specifically, the shape and size of the inner cross-section of the base box 31 are the same as the shape and size of the outer cross-section of the lifting plate 32.

[0025] By adopting the above technical solution, the sensor can ensure that the inner side of the base box 31 and the outer side of the lifting plate 32 are in close contact with each other, thereby preventing the lifting plate 32 from rotating and shifting during the lifting process, and thus ensuring the normal operation of the work.

[0026] Specifically, the storage component 34 includes a support block 341, a pressing bracket 342, a lead screw 343, and a storage box 344. The support block 341 is installed above the bottom box 31 and on the side of the tail sleeve component 6 away from the main body component 1 and below the optical cable 5. The storage box 344 is installed above the support block 341 and on the outside of the optical cable 5. The lead screw 343 is installed above the storage box 344 via a bearing. The pressing bracket 342 is installed on the outside of the lead screw 343 via a thread.

[0027] By adopting the above technical solution, staff can store the excess length of the optical cable 5 when needed through the cooperation of the storage box 344 and the pressing frame 342, thereby reducing potential inconvenience.

[0028] In this embodiment, when a fiber optic grating embedded strain sensor is required, the operator places the sensor in the working position and then rotates the screws 35 in the two fixed storage devices 3. The screws 35 are threadedly connected to the base box 31, and the screws 35 are bearing-connected to the lifting plate 32. The outer side of the lifting plate 32 and the inner side of the base box 31 are in contact with each other, so the two screws 35 drive the two lifting plates 32 to descend, thereby causing each insertion cone 33 to be inserted into its position for fixation. Then, the operator removes the excess length of the optical cable 5. The optical cable 5 is inserted into the storage box 344 of the two storage components 34. The two lead screws 343 are rotated respectively. The lead screws 343 are threadedly connected to the pressing frame 342, and the inner side of the pressing frame 342 is in contact with one side of the storage box 344. Therefore, the two lead screws 343 drive the two pressing frames 342 to descend, thereby cooperating with the two support blocks 341 to clamp the optical cable 5 and prevent part of the optical cable 5 in the storage box 344 from falling out of the storage box 344. Then, the staff can carry out the work by cooperating with the main component 1, the strain gauge housing 2, the optical cable 5 and the tail sleeve component 6. Example 2

[0029] The difference between this embodiment and embodiment 1 is that the isolation and protection device 4 includes a protective shell 41 and a limiting component 42. The protective shell 41 is provided on the outside of the two strain gauge shells 2, and the two strain gauge shells 2 are connected to the protective shell 41 through two limiting components 42.

[0030] By adopting the above technical solution, staff can use the protective shell 41 and other structures to provide a certain degree of isolation and protection for the strain gauge shell 2 and other structures when not working, thereby reducing the possibility of accidental damage to the strain gauge shell 2 and other structures.

[0031] Specifically, the limiting component 42 includes an inner cavity 421, a locking block 422, a compression spring 423, a connecting sleeve 424, and a connecting block 425. The connecting block 425 is installed on the top of the strain gauge housing 2. Two connecting sleeves 424 are installed on the top of the protective housing 41 and outside the two connecting blocks 425. The inner cavity 421 is opened on the inner side of the connecting block 425. The compression spring 423 is installed on the inner side of the inner cavity 421. The locking block 422 is installed on one side of the compression spring 423.

[0032] By adopting the above technical solution, the staff can connect or separate the strain gauge housing 2 and the protective housing 41 when needed by using the cooperation of structures such as the locking block 422 and the connecting sleeve 424, thereby facilitating the staff to load and unload the protective housing 41.

[0033] In this embodiment, when not in operation, the operator holds the protective shell 41 of the isolation and protection device 4, causing the connecting sleeves 424 of the two limiting components 42 on it to fit onto the connecting blocks 425 on the two strain gauge housings 2. Under pressure, the two locking blocks 422 are gradually pressed into the inner cavity 421 of the two connecting blocks 425. When the height of the two connecting sleeves 424 is lower than the two locking blocks 422, under the action of the two compression springs 423, the two locking blocks 422 partially disengage from the inner cavity 421 of the two connecting blocks 425, thereby limiting the two connecting sleeves 424 and the protective shell 41. Then, the protective shell 41 can provide a certain degree of isolation and protection for the strain gauge housing 2 and other structures, reducing the possibility of accidental damage to the strain gauge housing 2 and other structures.

[0034] The structure and principle of the main component 1 (comprising a fastening housing, a metal protective tube, a strain housing, a fiber optic grating area, a metal tube, a set screw, and a heat shrink tubing), the strain gauge housing 2, the optical cable 5, and the tail sleeve component 6 (comprising an FC stop housing, an FC crimp sleeve, and a rubber tail sleeve) of this utility model have been disclosed in a tensile-resistant embedded fiber optic grating strain sensor disclosed in Chinese Patent Application No. 202322582357.2. Its working principle involves the coordinated arrangement of the strain housing, two metal tubes, the fastening housing, and the protective components, which enables this tensile-resistant embedded fiber optic grating strain sensor to achieve multi-layer protection and improve its tensile strength. By using an elastic metal material for the strain gauge housing, this sensor possesses the advantages of high detection accuracy and repeatable strain monitoring. Metal protection is achieved through layers of metal tubes, fastening housings, and protective components, improving the overall compressive and tensile strength of the sensor and preventing damage from external environmental factors. The use of threaded connections and crimping between the sensor and optical cable enhances tensile strength compared to conventional adhesive bonding, improving the sensor's environmental resistance in harsh environments. Integrated packaging improves the product's structural reliability, reduces environmental damage, and extends its service life.

[0035] The working principle and usage process of this utility model are as follows: When a fiber optic grating embedded strain sensor is needed, the operator places the sensor in the working position and then rotates the screws 35 in the two fixed storage devices 3. The screws 35 are threadedly connected to the base box 31, and the screws 35 are bearing-connected to the lifting plate 32. The outer side of the lifting plate 32 is in contact with the inner side of the base box 31, so the two screws 35 drive the two lifting plates 32 to descend, thereby causing each insertion cone 33 to be inserted into its position for fixation. Then, the operator sends the excess length of the optical cable 5 into the storage box 344 in the two storage components 34. The operator then rotates the two lead screws 343, which are threadedly connected to the pressing frame 342. The inner side of the pressing frame 342 is in contact with one side of the storage box 344, so the two lead screws 343 drive the two pressing frames 342 to descend, thereby cooperating with the two support blocks 341 to clamp the optical cable 5 and prevent it from falling. Part of the optical cable 5 in the storage box 344 is detached from the storage box 344. Then, the operator can work by cooperating with the main component 1, the strain gauge housing 2, the optical cable 5, and the tail sleeve component 6. When not working, the operator holds the protective shell 41 in the isolation and protection device 4, so that the connecting sleeves 424 in the two limiting components 42 on it are put on the connecting blocks 425 on the two strain gauge housings 2. Under the pressure, the two locking blocks 422 are gradually pressed into the inner cavity 421 of the two connecting blocks 425. When the height of the two connecting sleeves 424 is lower than the two locking blocks 422, under the action of the two compression springs 423, the two locking blocks 422 are partially disengaged from the inner cavity 421 of the two connecting blocks 425, thereby limiting the two connecting sleeves 424 and the protective shell 41. Then, the protective shell 41 can provide a certain degree of isolation and protection for the strain gauge housing 2 and other structures, reducing the possibility of accidental damage to the strain gauge housing 2 and other structures.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fiber optic grating embedded strain sensor, comprising an optical cable (5), a main body assembly (1) disposed on the outer side of the optical cable (5), tail sleeve assemblies (6) installed on both sides of the main body assembly (1), and two strain gauge housings (2) installed on the outer side of the main body assembly (1), characterized in that: A fixing and storage device (3) is provided on the outside of the tail sleeve assembly (6), and an isolation and protection device (4) is provided on the outside of the two strain gauge housings (2).

2. The fiber optic grating embedded strain sensor according to claim 1, characterized in that: The fixed storage device (3) includes a base box (31), a lifting plate (32), a cone (33), a storage component (34), and a screw (35). The base box (31) is installed below the strain gauge housing (2). The screw (35) is installed on the top of the base box (31) by a thread. The lifting plate (32) is installed below the screw (35) and inside the base box (31) by a bearing. Multiple cones (33) are installed below the lifting plate (32). The storage component (34) is installed above the base box (31) and on the side of the tail sleeve component (6) away from the main component (1) and outside the optical cable (5).

3. The fiber optic grating embedded strain sensor according to claim 2, characterized in that: The shape and size of the inner cross-section of the bottom box (31) are the same as the shape and size of the outer cross-section of the lifting plate (32).

4. The fiber optic grating embedded strain sensor according to claim 2, characterized in that: The storage assembly (34) includes a support block (341), a pressing frame (342), a lead screw (343), and a storage box (344). The support block (341) is installed above the bottom box (31) and on the side of the tail sleeve assembly (6) away from the main body assembly (1) and below the optical cable (5). The storage box (344) is installed above the support block (341) and on the outside of the optical cable (5). The lead screw (343) is installed above the storage box (344) via a bearing. The pressing frame (342) is installed on the outside of the lead screw (343) via a thread.

5. The fiber optic grating embedded strain sensor according to claim 1, characterized in that: The isolation and protection device (4) includes a protective shell (41) and a limiting component (42). The protective shell (41) is provided on the outside of the two strain gauge shells (2). The two strain gauge shells (2) and the protective shell (41) are connected by two limiting components (42).

6. The fiber optic grating embedded strain sensor according to claim 5, characterized in that: The limiting component (42) includes an inner cavity (421), a locking block (422), a compression spring (423), a connecting sleeve (424), and a connecting block (425). A connecting block (425) is installed above the strain gauge housing (2). Two connecting sleeves (424) are installed on the top of the protective shell (41) and outside the two connecting blocks (425). An inner cavity (421) is opened on the inner side of the connecting block (425). A compression spring (423) is installed on the inner side of the inner cavity (421). A locking block (422) is installed on one side of the compression spring (423).

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