A strain monitoring device using optical fiber sensor

Abstract

The present invention provides a strain monitoring device using an optical fiber sensor, belonging to the field of optical fiber sensing and monitoring technology. The device includes a pipe, an optical fiber sensor, and a data acquisition system. The pipe sidewall is provided with a downward spiral groove and an upward spiral groove, the downward spiral grooves and the upward spiral grooves being arranged in an alternating and symmetrical pattern. The optical fiber sensor is arranged in a continuous spiral pattern along the downward spiral groove and the upward spiral groove. The data acquisition system is connected to the optical fiber sensor and can acquire strain data in real time through signals transmitted by the optical fiber sensor. The optical fiber sensor is a distributed optical fiber sensor, and the data acquisition system is a distributed optical fiber sensing system. By utilizing optical fiber sensing technology, the present invention spirally wraps the optical fiber of the optical fiber sensor around the pipe, and the pipe is inserted into the monitored area, achieving real-time monitoring and reducing labor costs. The device can monitor slopes with deep sliding interfaces, thereby improving monitoring effectiveness.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical fiber sensing monitoring, and in particular relates to a strain monitoring device using an optical fiber sensor. Background Art

[0002] In areas where geological disasters frequently occur, transportation infrastructure such as railways and roads are often threatened by geological disasters such as landslides. Therefore, it is necessary to monitor and analyze slope deformation in areas prone to geological disasters in order to effectively predict landslide trends, provide early warnings, and ensure the safe operation of transportation infrastructure.

[0003] In the existing technology, the monitoring methods for slopes are generally measured using theodolites, rangefinders, etc., which often require a lot of manpower and material resources, and the monitoring cost is high. In addition, it fails to take into account that for slopes with deeper sliding interfaces, the slope surface is very likely to be displaced as a whole during the early sliding, but no large deformation occurs on the slope surface away from the cracks. It is very likely that the slope sliding cannot be detected in a small area, and thus no early warning can be given. The monitoring effect is poor, and the monitoring process is easily affected by external forces, causing the detection equipment to loosen and move. Since a large number of people and vehicles pass through some slope areas to be monitored, such as mine tunnels and mountain road construction sites, during the monitoring process of these slope areas, once a vehicle scratches or a person accidentally hits them, it will cause them to loosen and shift, affecting the accuracy of slope monitoring. Based on this, it is urgent to design a technical solution with low monitoring cost, which can monitor slopes with deeper sliding interfaces and improve the monitoring effect. Summary of the Invention

[0004] Based on the problems existing in the prior art, the present invention proposes a strain monitoring device using an optical fiber sensor, which is suitable for monitoring slope collapse or landslide.

[0005] In order to achieve the above-mentioned objectives, the present invention adopts the following technical solutions: a strain monitoring device using an optical fiber sensor, comprising a tube body, an optical fiber sensor and a data acquisition system, wherein a downward spiral groove and an upward spiral groove are provided on the side wall of the tube body, and the downward spiral groove and the upward spiral groove are arranged symmetrically in an alternating manner, and the optical fiber sensor is arranged in a continuous spiral manner along the downward spiral groove and the upward spiral groove in sequence, and the data acquisition system is connected to the optical fiber sensor and can obtain strain data in real time through the signal transmitted by the optical fiber sensor; the optical fiber sensor adopts a distributed optical fiber sensor, and the data acquisition system is a distributed optical fiber sensing system, and the distributed optical fiber sensing system includes a light source and a signal processing module.

[0006] Furthermore, the two ends of the optical fiber sensor are respectively connected to a light source and a signal processing module. The signal processing module can collect strain data in real time and transmit it to a data processing platform. The data processing platform can establish a mapping relationship between strain and rock displacement to realize real-time monitoring and analysis of strain data. The data processing platform is equipped with an early warning device that can emit an alarm signal based on the strain data.

[0007] Preferably, both sides of the tube body are fixedly connected with a connecting shell, the inner cavity of the connecting shell is provided with a movable plate, the bottom of the movable plate is fixedly connected with an anti-loosening component, the bottom of the anti-loosening component passes through the outside of the connecting shell, and the connecting shell can facilitate the installation and fixation of the movable plate, the anti-loosening component and the locking component, and the movable plate can control the ground tube and the fixed tube to move up and down smoothly.

[0008] Preferably, the front and rear sides of the inner cavity of the connecting shell are fixedly connected with guide blocks, the front and rear sides of the movable plate are provided with guide grooves used in conjunction with the guide blocks, and the front and rear sides of the bottom of the connecting shell are fixedly connected with ground cones. The guide blocks and guide grooves can limit the movable plate to prevent it from shifting during movement. The ground cone can increase the stability of the connecting shell after it is installed and fixed, and prevent it from being affected by external forces during use and causing deviation, which affects the monitoring results of the slope.

[0009] Preferably, the anti-loosening component includes a ground plug, the top of the ground plug is fixedly connected to the movable plate, the top of the ground plug passes through the connecting shell and is fixedly connected with a pointed cone, the front and rear sides of the inner cavity of the ground plug are movably connected with push plates, the tops of the opposite sides of the two push plates are fixedly connected with triangular blocks, a tension spring is fixedly connected between the two push plates, a screw is provided between the two triangular blocks, the bottom of the screw is fixedly connected with a conical block, the ground plug can cooperate with the pointed cone to be inserted into the soil layer of the slope, the push plate can swing back and forth, the triangular block can cooperate with the conical block to control the use angle of the two push plates, the tension spring can make the two push plates located in the inner cavity of the ground plug when the triangular block is not squeezed, and the screw can control the use height of the conical block.

[0010] Preferably, the top of the movable plate is fixedly connected with a fixed tube, the top of the fixed tube passes through the outside of the connecting shell, the top of the screw passes through the inner cavity of the fixed tube, the surface of the screw is threadedly connected with a threaded sleeve, both sides of the threaded sleeve are fixedly connected to the inner wall of the fixed tube, and the fixed tube can facilitate the staff to use tools to control the use height of the movable plate and the ground plug, hammer the ground plug into the soil layer of the slope, install and fix the tube body to prevent it from being loosened by external force, and the threaded sleeve can cooperate with the screw to control the use height of the conical block.

[0011] Preferably, the top of the screw is fixedly connected with a hexagonal head, and the opposite sides of the two push plates are fixedly connected with a limiting cone. The front and rear sides of the ground plug are provided with movable openings. The hexagonal head can facilitate the staff to use a hexagonal wrench to rotate the screw, so that it cooperates with the threaded sleeve to control the conical block to squeeze the inclined surface of the triangular block, so that it controls the use angle of the two push plates to change, and the movable opening can facilitate the push plate to move out of the inner cavity of the ground plug.

[0012] Preferably, the connecting shell is fixedly connected to a mounting shell and a locking assembly on one side away from the pipe body, and a fixed lock hole is provided on the surface of the mounting shell. The mounting shell can cooperate with the mounting plate and the locking block fixed on its surface to connect the two pipe bodies, so that it can monitor different types of slopes in complex environments and terrains. The fixed lock hole can cooperate with the locking block to firmly connect the mounting shell and the mounting plate.

[0013] Preferably, the locking assembly includes a threaded column, the left side of the threaded column is fixedly connected to the connecting shell, the right side of the threaded column is fixedly connected to the mounting plate, the surface of the mounting plate is fixedly connected to a locking block, the surface of the threaded column is threadedly connected to a rotating sleeve, the right side of the rotating sleeve is movably connected to a movable ring, the threaded column can install and fix the mounting plate, the rotating sleeve can cooperate with the thread on the surface of the threaded column to control the use position of the movable ring, and the movable ring can control the push rod to move left and right.

[0014] The through hole can facilitate the push rod to adjust the use position of the top plate, and the protective pad can increase the protective effect of the top plate on the inner wall of the mounting shell, and prevent the top plate from causing extrusion and wear on the inner wall of the mounting shell.

[0015] Preferably, the radii of the ascending spiral groove and the descending spiral groove are both 1~5 cm, the spiral pitch of the descending spiral groove is 10 cm, the spiral pitch of the ascending spiral groove is the same as the spiral pitch of the descending spiral groove, the tube body is a cylindrical structure, and the inner diameter of the tube body is 4.5 cm, the outer diameter is 5.0 cm, and the length is 55 cm. The optical fiber sensor is arranged in a serpentine structure in the descending spiral groove and the ascending spiral groove through epoxy resin, and the descending spiral groove spirally descends from the head end of the tube body to the end of the tube body and is connected to the ascending spiral groove; the ascending spiral groove spirally ascends from the end of the tube body back to the head end of the tube body, and the outer surface of the tube body is provided with an anti-corrosion layer.

[0016] Compared with the prior art, the advantages and positive effects of the strain monitoring device using optical fiber sensors of the present invention are:

[0017] 1. The present invention adopts fiber optic sensing technology, spirally wraps the optical fiber of the fiber optic sensor around a pipe, and then inserts the pipe into the area to be monitored, which can achieve real-time monitoring and reduce labor costs; it can also monitor slopes with deeper sliding interfaces, thereby improving the monitoring effect.

[0018] 2. The present invention uses upward spiral grooves and downward spiral grooves opened on the surface of the pipe body to install optical fiber sensors, so that the optical fiber will not be damaged during the monitoring of the slope, thereby improving its service life and monitoring accuracy. The upward spiral grooves and downward spiral grooves are filled with epoxy resin, which can also improve the fracture resistance and adaptability of the optical fiber of the optical fiber sensor, so that it can monitor different types of slopes in different environments. The surface of the pipe body is sprayed with an anti-corrosion layer to improve its corrosion resistance and stability, so that it has a longer service life.

[0019] 3. The present invention can stably install the pipe body at the monitoring position of the slope through the anti-loosening component to prevent it from being displaced by external forces, so that the slope can be accurately monitored. After the pipe body is buried in the monitoring position, the fixed pipe is hammered with a tool, and the fixed pipe is used to insert the ground pipe into the soil deep in the slope. The hexagonal wrench is then used to rotate the hexagonal head. The rotation of the screw is controlled by the hexagonal head. The screw and the threaded sleeve cooperate to make the conical block squeeze the triangular block, and the two push plates are pushed out of the inner cavity of the ground pipe. The contact area between the pipe body and the soil layer is increased by the two unfolded push plates to prevent it from being displaced and loosened by external forces, thereby avoiding affecting the monitoring results of the slope.

[0020] 4. The present invention uses a locking assembly to stably connect multiple pipe bodies to each other, thereby improving the monitoring range of the pipe body on the slope. Multiple pipe bodies can be installed by assembling them, which can reduce their occupied space during storage and transportation. The mounting plate is inserted into the inner cavity of the mounting shell, and the locking block cooperates with the fixed lock hole to position and fix the mounting plate. The rotating sleeve is rotated to control the movement of the movable ring and the push rod. The push rod moves to control the top plate to squeeze the inner wall of the mounting shell, further increasing the stability of the connection between the mounting shell and the mounting plate. When disassembling, it only needs to reverse the rotating sleeve and the mounting plate to separate the two pipe bodies from each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the three-dimensional structure of a strain monitoring device using an optical fiber sensor according to the present invention;

[0022] Figure 2 is a schematic diagram of a tube body according to the present invention;

[0023] Figure 3 is a side view of a tube body according to the present invention;

[0024] Figure 4 is a schematic diagram of an optical fiber sensor according to the present invention;

[0025] Figure 5 A side view of a three-dimensional structure according to the present invention;

[0026] Figure 6 is a cross-sectional view of a mounting plate according to the present invention;

[0027] Figure 7 is a cross-sectional view of a connection shell according to the present invention;

[0028] Figure 8 A cross-sectional view of a ground pipe and a fixed pipe according to the present invention;

[0029] Figure 9 A schematic diagram of another type of optical fiber sensor according to an embodiment of the present invention;

[0030] Figure 10 A schematic diagram of another style of a tube body and a connecting shell according to an embodiment of the present invention;

[0031] Figure 11 is a schematic diagram of a tube body according to another embodiment of the present invention;

[0032] Figure 12 Schematic diagram of optical fiber arrangement according to an embodiment of the present invention;

[0033] Figure 13 FIG. 1 is a schematic diagram of optical fiber arrangement in another embodiment of the present invention.

[0034] Explanation of the reference numerals in the accompanying drawings: 1. tube body; 2. ascending spiral groove; 3. descending spiral groove; 4. optical fiber sensor; 5. connecting shell; 6. movable plate; 7. anti-loosening assembly; 701. ground plug; 702. pointed cone; 703. push plate; 704. triangular block; 705. tension spring; 706. screw; 707. conical block; 708. fixing tube; 709. threaded sleeve; 710. hexagonal head; 711. limiting cone; 8. mounting shell; 9. locking assembly; 901. threaded column; 902. mounting plate; 903. locking block; 904. rotating sleeve; 905. movable ring; 906. top plate; 907. push rod; 10. fixed lock hole. DETAILED DESCRIPTION

[0035] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0036] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following invention description.

[0037] The present invention provides a strain monitoring device using an optical fiber sensor, which includes a tube body, an optical fiber sensor and a data acquisition system. The tube body side wall is provided with a downward spiral groove and an upward spiral groove, the downward spiral groove and the upward spiral groove are arranged in an alternating and symmetrical manner, the optical fiber sensor is arranged in a continuous spiral along the downward spiral groove and the upward spiral groove, the data acquisition system is connected to the optical fiber sensor, and can obtain strain data in real time through the signal transmitted by the optical fiber sensor; the optical fiber sensor is a distributed optical fiber sensor, and the data acquisition system is a distributed optical fiber sensing system, which includes a light source and a signal processing module.

[0038] The following is a description of a strain monitoring device using an optical fiber sensor according to the present invention, which includes a tube body 1, an optical fiber sensor 4, and a data acquisition system. A downward spiral groove 3 and an upward spiral groove 2 are provided on the side wall of the tube body 1. The downward spiral groove 3 and the upward spiral groove 2 are arranged symmetrically and staggered. The optical fiber sensor 4 is arranged in a continuous spiral along the downward spiral groove 3 and the upward spiral groove 2. The data acquisition system is connected to the optical fiber sensor 4 and can obtain strain data in real time through the signal transmitted by the optical fiber sensor 4. The optical fiber sensor 4 adopts a distributed optical fiber sensor. The data acquisition system is a distributed optical fiber sensing system. The distributed optical fiber sensing system includes a light source and a signal processing module. The two ends of the optical fiber sensor are respectively connected to the light source and the signal processing module. The signal processing module can collect strain data in real time and transmit it to the data processing platform. The data processing platform It can establish a mapping relationship between strain and rock displacement, and realize real-time monitoring and analysis of strain data. The data processing platform is equipped with an early warning device, which can transmit an alarm signal according to the strain data. The radius of the upward spiral groove 2 and the downward spiral groove 3 are both 1-5 cm, the spiral pitch of the downward spiral groove 3 is 10 cm, and the spiral pitch of the upward spiral groove 2 is the same as the spiral pitch of the downward spiral groove 3. The pipe body 1 is a cylindrical structure, and the inner diameter of the pipe body 1 is 4.5 cm, the outer diameter is 5.0 cm, and the length is 55 cm. The optical fiber sensor 4 is arranged in a serpentine structure in the downward spiral groove 3 and the upward spiral groove 2 through epoxy resin. The downward spiral groove 3 spirally descends from the head end of the pipe body 1 to the end of the pipe body, and is connected to the upward spiral groove 2; the upward spiral groove 2 spirally ascends from the end of the pipe body 1 back to the head end of the pipe body 1, and the outer surface of the pipe body 1 is provided with an anti-corrosion layer.

[0039] By adopting the above technical solution, the optical fiber sensor 4 is arranged in a serpentine shape in a continuous spiral sequence along the downward spiral groove 3 and the upward spiral groove 2. The optical fiber sensor 4 is fixed in the downward spiral groove 3 and the upward spiral groove 2 by slight pressing or bonding to avoid loosening or breakage due to changes in the external environment or vibration. The two ends of the optical fiber sensor 4 are connected to the data acquisition system through connectors to realize real-time transmission of signals. The optical fiber sensor 4 of this embodiment adopts a distributed optical fiber sensor, such as a fiber grating sensor, a Raman optical fiber sensor, etc. The distributed optical fiber sensor includes an optical fiber. By arranging multiple monitoring points on the optical fiber, distributed monitoring can be realized to collect data at different locations. The two ends of the optical fiber sensor 4 are connected to the light source and signal processing module of the distributed optical fiber sensing system. The signal processing module can use Brillouin scattering technology to collect strain data in real time and transmit it to the data processing platform. The data processing platform uses a mature and known algorithm to analyze the strain signal, establish a mapping relationship between strain and rock displacement, and realize real-time monitoring and accurate measurement of strain data. Accurate analysis shows that this arrangement improves the fracture resistance of the optical fiber sensor 4 and enhances its monitoring accuracy and reliability in complex environments. In some embodiments, the shapes of the downward spiral groove 3 and the upward spiral groove 2 can be designed to different angles, depths and spacings according to actual needs, so that the optical fiber sensor 4 and the optical fiber can better adapt to the stress changes in the geological environment and effectively reduce the risk of optical fiber breakage. The data acquisition system is connected to the optical fiber sensor 4 and can obtain strain data in real time through the signal transmitted by the optical fiber sensor 4. The data processing platform of the known structure calculates the degree of strain change and its trend in real time based on the collected data, and analyzes possible risks or problems. Through the set algorithm, the signal changes of the optical fiber sensor 4 can be analyzed in detail to identify potential structural problems or environmental anomalies. When abnormal strain or other dangerous signals are detected, the alarm system will be automatically triggered, and early warning information will be sent to relevant personnel through sound, text messages, emails, etc., to provide guarantees for timely emergency measures.

[0040] In addition, the radius of the upward spiral groove 2 is 1-5 cm, the radius of the downward spiral groove 3 is 1-5 cm, the groove depth of the downward spiral groove 3 and the upward spiral groove 2 is both 2 mm, and 5 turns are designed respectively to ensure that the optical fiber sensor 4 can be stably arranged along the groove, and a sensing point is set every 10 cm to ensure full coverage monitoring. The spiral pitch of the downward spiral groove 3 and the upward spiral groove 2 is both 10 cm. When external factors (such as geological movement, traffic load, etc.) cause the environment in which the pipe body 1 is located to deform, the downward spiral groove 3 and the upward spiral groove 2 will undergo slight deformation due to strain. This deformation will affect the optical signal propagation characteristics of the optical fiber of the optical fiber sensor 4 (such as changes in the refractive index of the optical fiber, optical transmission loss, etc.). By measuring the changes in the optical signal in the optical fiber, the strain and pressure changes in the surrounding environment can be monitored in real time.

[0041] Furthermore, the optical fiber sensor 4 is arranged in a serpentine structure in the downward spiral groove 3 and the upward spiral groove 2 through epoxy resin. The optical fiber sensor 4 is arranged in a continuous spiral form, which can ensure that the strain changes when subjected to external force are accurately captured, avoiding monitoring failure caused by the breakage of the optical fiber sensor 4. The optical fiber sensor 4 of this embodiment can select technologies such as fiber grating or Raman optical fiber sensor 4 to improve the sensitivity and accuracy of strain measurement.

[0042] Preferably, the downward spiral groove 3 spirally descends from the head end of the tube body 1 to the end of the tube body 1, and is connected to the upward spiral groove 2. The upward spiral groove 2 spirally ascends from the end of the tube body 1 back to the head end of the tube body 1, and the optical fiber sensor 4 is spirally arranged following the trajectories of the downward spiral groove 3 and the upward spiral groove 2, which significantly improves the fracture resistance, adaptability and monitoring accuracy of the optical fiber sensor 4. Compared with the traditional linear optical fiber sensor 4, it can effectively avoid optical fiber breakage caused by external forces, and is particularly suitable for complex environments such as soil, underground and areas prone to geological disasters. In addition, the optical fiber sensor 4 has high sensitivity and high precision, can monitor strain changes in real time, provide accurate dynamic data, and also supports long-distance and distributed monitoring, adapting to the monitoring needs of large-scale infrastructure. At the same time, due to its corrosion resistance and strong stability, it has a long service life and low maintenance cost.

[0043] In another embodiment, according to actual needs and the layout of the optical fiber sensor 4, the inner diameter of the tube body 1 is adjusted to 5.0 cm to ensure that the optical fiber sensor 4 can be stably laid out and there is enough space to avoid damage to the optical fiber. The outer diameter of the tube body 1 is 5.5 cm to improve the overall strength and stability of the tube body 1 and ensure that the optical fiber sensor 4 is not affected by external impact during the layout. The length of the tube body 1 is designed to be 60 cm to ensure sufficient monitoring space and more sensing nodes to meet more complex geological monitoring needs. The tube body 1 can be installed in complex environments that need to be monitored, such as underground, bridges, tunnels, etc. The optical fiber sensor 4 can be installed on the surface or underground of the facility by burying or fixing the bracket. Since the tube body 1 is compact and has a stable structure, it can adapt to different installation requirements. After installation, it is necessary to regularly check whether the optical fiber connection is loose, whether the sensing system is working properly, and whether the data collection is accurate. The system should be calibrated at regular intervals to ensure system accuracy and reliability.

[0044] In another embodiment, the ascending spiral groove 2 or the descending spiral groove 3 may be removed, such as Figure 9 As shown, the optical fiber sensor 4 cooperates with the ascending spiral groove 2 or the descending spiral groove 3 and can adopt a single spiral structure provided on the tube body 1, and can also realize the monitoring function of the device of the present invention.

[0045] In another embodiment, a connecting shell 5 is provided separately, and a cone is fixed at the other end of the tube body 1, such as Figure 10As shown, the pipe body 1 can be vertically inserted into the monitoring pit opened on the slope surface. After backfilling the soil, a hammer or other tool is used to hammer the fixed pipe 708 to insert the ground pipe 701 into the soil layer. Then, a hexagonal wrench and a hexagonal head 710 are used to control the rotation of the screw 706, so that the two push plates 703 inside the ground pipe 701 are expanded to limit and fix the pipe body 1, so that the pipe body 1 can be stably prevented from loosening when installed in a vertical state.

[0046] By adopting the above technical solution, by setting up the anti-loosening component 7, the pipe body 1 can be stably installed at the monitoring position of the slope to prevent it from being displaced by external forces, so that the slope can be accurately monitored. After the pipe body 1 is buried in the monitoring position, the fixed pipe 708 is hammered with a tool, and the fixed pipe 708 is used to insert the ground plug 701 into the soil deep in the slope, and then the hexagonal wrench is used to rotate the hexagonal head 710. The hexagonal head 710 is used to control the rotation of the screw 706. The screw 706 cooperates with the threaded sleeve 709 to make the conical block 707 squeeze the triangular block 704, and push the two push plates 703 out of the inner cavity of the ground plug 701. The contact area between the pipe body 1 and the soil layer is increased by the two unfolded push plates 703 to prevent it from being displaced and loosened by external forces, thereby avoiding affecting the monitoring results of the slope.

[0047] In addition, both sides of the tube body 1 are fixedly connected with a connecting shell 5, and the inner cavity of the connecting shell 5 is provided with a movable plate 6, and the bottom of the movable plate 6 is fixedly connected with an anti-loosening component 7, and the bottom of the anti-loosening component 7 passes through the outside of the connecting shell 5. The connecting shell 5 can facilitate the installation and fixation of the movable plate 6, the anti-loosening component 7 and the locking component 9, and the movable plate 6 can control the ground plug 701 and the fixed tube 708 to move up and down smoothly. The front and rear sides of the inner cavity of the connecting shell 5 are fixedly connected with guide blocks, and the front and rear sides of the movable plate 6 are provided with guide grooves for use with the guide blocks. The front and rear sides of the bottom of the connecting shell 5 are fixedly connected with ground cones, and the guide blocks and guide grooves can limit the movable plate 6 to prevent it from deflecting during the movement. The ground cone can increase the stability of the connecting shell 5 after installation and fixation, and prevent it from being affected by external forces during use and deflecting, affecting the monitoring results of the slope.

[0048] On the other hand, the anti-loosening component 7 includes a ground plug 701, the top of the ground plug 701 is fixedly connected to the movable plate 6, the top of the ground plug 701 passes through the connecting shell 5 and is fixedly connected to a pointed cone 702, the front and rear sides of the inner cavity of the ground plug 701 are movably connected to push plates 703, the tops of the opposite sides of the two push plates 703 are fixedly connected to triangular blocks 704, a tension spring 705 is fixedly connected between the two push plates 703, a screw 706 is provided between the two triangular blocks 704, and the bottom of the screw 706 is fixedly connected to a conical block 707, the ground plug 701 can cooperate with the pointed cone 702 to be inserted into the soil layer of the slope, the push plate 703 can swing back and forth, the triangular block 704 can cooperate with the conical block 707 to control the use angle of the two push plates 703, and the tension spring 705 can prevent the two push plates from loosening when the triangular block 704 is not squeezed.

[0049] Furthermore, the top of the movable plate 6 is fixedly connected with a fixed tube 708, the top of the fixed tube 708 passes through the outside of the connecting shell 5, the top of the screw 706 passes through the inner cavity of the fixed tube 708, the surface of the screw 706 is threadedly connected with a threaded sleeve 709, both sides of the threaded sleeve 709 are fixedly connected to the inner wall of the fixed tube 708, and the fixed tube 708 can facilitate the staff to use tools to control the use height of the movable plate 6 and the ground plug 701, hammer the ground plug 701 into the soil layer of the slope, install and fix the pipe body 1 to prevent it from being loosened by external forces, and the threaded sleeve 709 can Cooperate with screw rod 706 to control the use height of conical block 707. The top of screw rod 706 is fixedly connected with hexagonal head 710. The opposite sides of two push plates 703 are fixedly connected with limiting cone 711. The front and rear sides of ground plug 701 are provided with movable openings. The hexagonal head 710 can facilitate the staff to use a hexagonal wrench to rotate screw rod 706, so that it cooperates with threaded sleeve 709 to control conical block 707 to squeeze the inclined surface of triangular block 704, so that it controls the use angle of two push plates 703 to change. The movable opening can facilitate the push plate 703 to move out of the inner cavity of ground plug 701.

[0050] By adopting the above technical solution, by setting a locking assembly 9, multiple pipe bodies 1 can be stably connected to each other, thereby improving the monitoring range of the pipe body 1 on the slope, and multiple pipe bodies 1 can be installed by assembling, which can reduce their occupied space during storage and transportation. The mounting plate 902 is inserted into the inner cavity of the mounting shell 8, and the locking block 903 cooperates with the fixed lock hole 10 to position and fix the mounting plate 902. The rotating sleeve 904 is rotated to control the movement of the movable ring 905 and the push rod 907. The push rod 907 moves to control the top plate 906 to squeeze the inner wall of the mounting shell 8, further increasing the stability of the connection between the mounting shell 8 and the mounting plate 902. When disassembling, it is only necessary to reverse the rotating sleeve 904 and the mounting plate 902 to separate the two pipe bodies 1 from each other.

[0051] In addition, the side of the connecting shell 5 away from the pipe body 1 is fixedly connected to the mounting shell 8 and the locking assembly 9. The surface of the mounting shell 8 is provided with a fixed lock hole 10. The mounting shell 8 can cooperate with the mounting plate 902 and the locking block 903 fixed on its surface to connect the two pipe bodies 1, so that it can monitor different types of slopes in complex environments and terrains. The fixed lock hole 10 can cooperate with the locking block 903 to firmly connect the mounting shell 8 and the mounting plate 902. The locking assembly 9 includes a threaded column 901. The left side of the threaded column 901 It is fixedly connected to the connecting shell 5, and the right side of the threaded column 901 is fixedly connected to the mounting plate 902, and the surface of the mounting plate 902 is fixedly connected to the locking block 903, and the surface of the threaded column 901 is threadedly connected to the rotating sleeve 904, and the right side of the rotating sleeve 904 is movably connected to the movable ring 905. The threaded column 901 can install and fix the mounting plate 902, and the rotating sleeve 904 can cooperate with the thread on the surface of the threaded column 901 to control the use position of the movable ring 905, and the movable ring 905 can control the push rod 907 to move left and right.

[0052] On the other hand, the inner cavity of the mounting disk 902 is provided with a top plate 906, and the top and bottom of the left side of the top plate 906 are fixedly connected with a push rod 907. The left side of the push rod 907 passes through the mounting disk 902 and is fixedly connected to the movable ring 905. The push rod 907 can cooperate with the movable ring 905 to adjust the use position of the top plate 906. The top plate 906 can squeeze the inner wall of the mounting shell 8, further improving the stability of the connection between the mounting disk 902 and the mounting shell 8, and preventing the mounting disk 902 and the mounting shell 8 from loosening during use.

[0053] Furthermore, anti-skid bumps are fixedly connected to the surface of the rotating sleeve 904, and through holes are provided on the top and bottom of the left side of the mounting plate 902 for use with the push rod 907. A protective pad is fixedly connected to the right side of the top plate 906. The anti-skid bumps can improve the anti-skid effect of the rotating sleeve 904 and prevent the staff from slipping when rotating the rotating sleeve 904. The through holes can facilitate the push rod 907 to adjust the use position of the top plate 906. The protective pad can increase the protective effect of the top plate 906 on the inner wall of the mounting shell 8 and prevent the top plate 906 from causing extrusion and wear on the inner wall of the mounting shell 8.

[0054] The strain monitoring device using an optical fiber sensor of the present invention will be further described below with reference to specific embodiments.

[0055] like Figures 1-13As shown, the present invention provides a strain monitoring device using an optical fiber sensor, which includes a tube body 1, an optical fiber sensor 4 and a data acquisition system. A downward spiral groove 3 and an upward spiral groove 2 are provided on the side wall of the tube body 1. The downward spiral groove 3 and the upward spiral groove 2 are arranged in an alternating and symmetrical manner. The optical fiber sensor 4 is arranged in a continuous spiral along the downward spiral groove 3 and the upward spiral groove 2. The data acquisition system is connected to the optical fiber sensor 4 and can obtain strain data in real time through the signal transmitted by the optical fiber sensor 4. The optical fiber sensor 4 adopts a distributed optical fiber sensor. The data acquisition system is a distributed optical fiber sensing system. The distributed optical fiber sensing system includes a light source and a signal processing module. The two ends of the optical fiber sensor are respectively connected to the light source and the signal processing module. The signal processing module can collect strain data in real time and transmit it to the data processing platform. The data processing platform can A mapping relationship between strain and rock displacement is established to realize real-time monitoring and analysis of strain data. The data processing platform is equipped with an early warning device that can transmit an alarm signal based on the strain data. The radius of the upward spiral groove 2 and the downward spiral groove 3 are both 1~5 cm, the spiral pitch of the downward spiral groove 3 is 10 cm, and the spiral pitch of the upward spiral groove 2 is the same as the spiral pitch of the downward spiral groove 3. The pipe body 1 is a cylindrical structure with an inner diameter of 4.5 cm, an outer diameter of 5.0 cm, and a length of 55 cm. The optical fiber sensor 4 is arranged in a serpentine structure in the downward spiral groove 3 and the upward spiral groove 2 through epoxy resin. The downward spiral groove 3 spirally descends from the head end of the pipe body 1 to the end of the pipe body and is connected to the upward spiral groove 2; the upward spiral groove 2 spirally ascends from the end of the pipe body 1 back to the head end of the pipe body 1, and the outer surface of the pipe body 1 is provided with an anti-corrosion layer.

[0056] The specific configuration and functions of the optical fiber sensor 4, the data acquisition system, the anti-loosening component 7 and the locking component 9 are described in detail below.

[0057] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, a downward spiral groove 3 and an upward spiral groove 2 are provided on the side wall of the pipe body 1, and the downward spiral groove 3 and the upward spiral groove 2 are arranged in an alternating and symmetrical manner. The optical fiber sensor 4 is arranged in a continuous spiral manner along the downward spiral groove 3 and the upward spiral groove 2. The data acquisition system is connected to the optical fiber sensor 4 and can obtain strain data in real time through the signal transmitted by the optical fiber sensor 4. The optical fiber sensor 4 adopts a distributed optical fiber sensor. The data acquisition system is a distributed optical fiber sensing system. The distributed optical fiber sensing system includes a light source and a signal processing module. The two ends of the optical fiber sensor 4 are respectively connected to the light source and the signal processing module. The signal processing module can collect strain data in real time and transmit it to the data processing platform. The data processing platform can establish a mapping relationship between strain and rock displacement to realize real-time monitoring and analysis of strain data. The data processing platform is provided with an early warning device that can transmit an alarm signal according to the strain data.

[0058] The effect achieved by the entire fiber optic sensor 4 and data acquisition system is that the optical fiber of the fiber optic sensor 4 is spirally wound on the pipe body 1, and then the pipe body 1 is inserted into the area to be monitored, which can realize real-time monitoring and reduce labor costs. After the pipe body 1 is inserted into the area to be monitored, it can monitor the slope with a deeper sliding interface, thereby improving the monitoring effect. The upward spiral groove 2 and the downward spiral groove 3 opened on the surface of the pipe body 1 are used to install the fiber optic sensor 4, so that the optical fiber will not be damaged during the monitoring process of the slope, thereby improving its service life and monitoring accuracy. In addition, the upward spiral groove 2 and the downward spiral groove 3 are filled with epoxy resin, which can also The fiber optic sensor 4 improves its fracture resistance and adaptability, enabling it to monitor different types of slopes in different environments. The surface of the pipe body 1 is sprayed with an anti-corrosion layer to improve its corrosion resistance and stability, giving it a longer service life. Both ends of the fiber optic sensor 4 are connected to the light source and signal processing module of the distributed fiber optic sensing system. The signal processing module can use Brillouin scattering technology to collect strain data in real time and transmit it to the data processing platform. The data processing platform uses mature and known algorithms to analyze the strain signal, establish a mapping relationship between strain and rock displacement, and realize real-time monitoring and accurate analysis of strain data.

[0059] like Figure 7 and Figure 8As shown, both sides of the tube body 1 are fixedly connected with a connecting shell 5, and the inner cavity of the connecting shell 5 is provided with a movable plate 6, and the bottom of the movable plate 6 is fixedly connected with an anti-loosening component 7, and the bottom of the anti-loosening component 7 passes through the outside of the connecting shell 5. The connecting shell 5 can facilitate the installation and fixation of the movable plate 6, the anti-loosening component 7 and the locking component 9, and the movable plate 6 can control the ground plug 701 and the fixed tube 708 to move up and down smoothly. The front and rear sides of the inner cavity of the connecting shell 5 are fixedly connected with guide blocks, and the front and rear sides of the movable plate 6 are provided with guide grooves for use with the guide blocks. The front and rear sides of the bottom of the connecting shell 5 are fixedly connected with ground cones, and the guide blocks and guide grooves can limit the movable plate 6 to prevent it from deflecting during the movement, and the ground cone can increase The stability of the connecting shell 5 after installation and fixation is increased to prevent it from being affected by external forces during use and being offset to affect the monitoring results of the slope. The anti-loosening component 7 includes a ground plug 701. The top of the ground plug 701 is fixedly connected to the movable plate 6. The top of the ground plug 701 passes through the connecting shell 5 and is fixedly connected to a sharp cone 702. The front and rear sides of the inner cavity of the ground plug 701 are movably connected to push plates 703. The tops of the opposite sides of the two push plates 703 are fixedly connected to triangular blocks 704. A tension spring 705 is fixedly connected between the two push plates 703. A screw 706 is provided between the two triangular blocks 704. The bottom of the screw 706 is fixedly connected to a conical block 707. The ground plug 701 can cooperate with the sharp cone 702 to be inserted into the soil layer of the slope. The push plate 70 3 can swing back and forth, the triangular block 704 can cooperate with the conical block 707 to control the use angle of the two push plates 703, the tension spring 705 can make the two push plates 703 be located in the inner cavity of the ground plug 701 when the triangular block 704 is not squeezed, the screw 706 can control the use height of the conical block 707, the top of the movable plate 6 is fixedly connected with a fixed tube 708, the top of the fixed tube 708 passes through the outside of the connecting shell 5, the top of the screw 706 passes through the inner cavity of the fixed tube 708, the surface of the screw 706 is threadedly connected with a threaded sleeve 709, both sides of the threaded sleeve 709 are fixedly connected to the inner wall of the fixed tube 708, and the fixed tube 708 can facilitate the staff to use tools to control the use height of the movable plate 6 and the ground plug 701 , hammer the ground plug 701 into the soil layer of the slope, install and fix the pipe body 1 to prevent it from loosening due to external force, the threaded sleeve 709 can cooperate with the screw 706 to control the use height of the conical block 707, the top of the screw 706 is fixedly connected with a hexagonal head 710, and the opposite sides of the two push plates 703 are fixedly connected to the limiting cone 711, and the front and rear sides of the ground plug 701 are provided with movable openings, and the hexagonal head 710 can facilitate the staff to use a hexagonal wrench to rotate the screw 706, so that it cooperates with the threaded sleeve 709 to control the conical block 707 to squeeze the inclined surface of the triangular block 704, so that it controls the use angle of the two push plates 703 to change, and the movable opening can facilitate the push plate 703 to move out of the inner cavity of the ground plug 701.

[0060] The effect achieved by the entire anti-loosening component 7 is that the pipe body 1 can be stably installed at the monitoring position of the slope to prevent it from being displaced by external forces, so that it can accurately monitor the slope. After the pipe body 1 is buried in the monitoring position, the fixed pipe 708 is hammered with a tool, and the fixed pipe 708 is used to insert the ground plug 701 into the soil deep in the slope, and then the hexagonal wrench is used to rotate the hexagonal head 710. The hexagonal head 710 is used to control the rotation of the screw 706. The screw 706 cooperates with the threaded sleeve 709 to make the conical block 707 squeeze the triangular block 704, and push the two push plates 703 out of the inner cavity of the ground plug 701. The contact area between the pipe body 1 and the soil layer is increased by the two unfolded push plates 703 to prevent it from being displaced and loosened by external forces, thereby avoiding affecting the monitoring results of the slope.

[0061] like Figure 5 and Figure 6As shown, the side of the connecting shell 5 away from the pipe body 1 is fixedly connected to the mounting shell 8 and the locking assembly 9. The surface of the mounting shell 8 is provided with a fixed lock hole 10. The mounting shell 8 can cooperate with the mounting plate 902 and the locking block 903 fixed on its surface to connect the two pipe bodies 1, so that it can monitor different types of slopes in complex environments and terrains. The fixed lock hole 10 can cooperate with the locking block 903 to firmly connect the mounting shell 8 and the mounting plate 902. The locking assembly 9 includes a threaded column 901. The left side of the threaded column 901 is connected to the The connecting shell 5 is fixedly connected, the right side of the threaded column 901 is fixedly connected to the mounting plate 902, the surface of the mounting plate 902 is fixedly connected to the locking block 903, the surface of the threaded column 901 is threadedly connected to the rotating sleeve 904, and the right side of the rotating sleeve 904 is movably connected to the movable ring 905. The threaded column 901 can fix the mounting plate 902, and the rotating sleeve 904 can cooperate with the thread on the surface of the threaded column 901 to control the use position of the movable ring 905. The movable ring 905 can control the push rod 907 to move left and right. The inner cavity of the disk 902 is provided with a top plate 906, and the top and bottom of the left side of the top plate 906 are fixedly connected with a push rod 907. The left side of the push rod 907 passes through the mounting disk 902 and is fixedly connected to the movable ring 905. The push rod 907 can cooperate with the movable ring 905 to adjust the use position of the top plate 906. The top plate 906 can squeeze the inner wall of the mounting shell 8 to further improve the stability of the connection between the mounting disk 902 and the mounting shell 8, and prevent the mounting disk 902 and the mounting shell 8 from loosening during use. 04 is fixedly connected with anti-skid bumps on the surface, and the top and bottom of the left side of the mounting plate 902 are provided with through holes for use with the push rod 907. The right side of the top plate 906 is fixedly connected with a protective pad. The anti-skid bumps can improve the anti-skid effect of the rotating sleeve 904 and prevent the staff from sliding when rotating the rotating sleeve 904. The through holes can facilitate the push rod 907 to adjust the use position of the top plate 906. The protective pad can increase the protective effect of the top plate 906 on the inner wall of the mounting shell 8 and prevent the top plate 906 from causing extrusion and wear on the inner wall of the mounting shell 8.

[0062] The effect achieved by the entire locking assembly 9 is that it can stably connect multiple pipe bodies 1 to each other, improve the monitoring range of the pipe body 1 on the slope, and enable multiple pipe bodies 1 to be installed by assembling, which can reduce the space occupied during storage and transportation. The mounting plate 902 is inserted into the inner cavity of the mounting shell 8, and the locking block 903 cooperates with the fixed lock hole 10 to position and fix the mounting plate 902. The rotating sleeve 904 is rotated to control the movement of the movable ring 905 and the push rod 907. The push rod 907 moves to control the top plate 906 to squeeze the inner wall of the mounting shell 8, further increasing the stability of the connection between the mounting shell 8 and the mounting plate 902. When disassembling, it is only necessary to reverse the rotating sleeve 904 and the mounting plate 902 to separate the two pipe bodies 1 from each other.

[0063] The working principle of the strain monitoring device using optical fiber sensors is as follows:

[0064] 1. The pipe body 1 is evenly arranged in the slope or support structure area to continuously monitor the high-risk areas. Each pipe body 1 is made of high-strength, corrosion-resistant composite materials with an inner diameter of 5.0 cm, an outer diameter of 5.5 cm, and a length of 60 cm. The optical fiber sensor 4 is fixed in the upward spiral groove 2 and the downward spiral groove 3 of the pipe body 1 by epoxy resin, and a "snake-shaped" layout is adopted to ensure uniform distribution throughout the length of the pipe body 1, thereby improving monitoring accuracy and stability. Both ends of the optical fiber sensor 4 are connected to the distributed optical fiber sensing system, which uses Brillouin scattering technology BOTDA to collect strain data in real time and transmit it to the data processing platform for analysis. The system uses mature algorithms to establish a mapping relationship between strain and rock displacement to ensure the accuracy and real-time nature of the monitoring data. When the monitored strain data exceeds the preset threshold, the system will automatically trigger an alarm and notify the mine management personnel through SMS, phone and email, so that emergency measures can be taken in time.

[0065] 2. During the installation of the pipe body 1, a shallow trench is excavated on the surface of the slope or supporting structure, the pipe body 1 is placed inside the installation trench, and the fixed pipe 708 is hammered with a hammer or other tool. The fixed pipe 708 drives the movable plate 6 and the ground plug 701 to move downward, so that the ground plug 701 is inserted into the soil layer of the slope or supporting structure. Then, the hexagonal wrench is used to turn the hexagonal head 710, and the hexagonal head 710 controls the screw 706 to rotate. During the rotation process, the screw 706 The tapered block 707 cooperates with the threaded sleeve 709 to control the upward movement of the tapered block 707, and the tapered block 707 squeezes the inclined surface of the triangular block 704, so that the triangular block 704 controls the two push plates 703 to unfold. After the push plates 703 are unfolded, they are inserted into the soil layer to improve the stability of the pipe body 1. Part of the soil is backfilled to bury the pipe body 1 in the slope or support structure, so that it can accurately carry out monitoring work, avoid displacement and loosening due to external forces, and prevent affecting the monitoring results of the slope and support structure.

[0066] 3. When it is necessary to monitor the slope structure and support structure of soft soil, in order to avoid the displacement of the laid pipe body 1 caused by soil sliding and affecting the monitoring results, multiple pipe bodies 1 are connected to form a whole and fixed in the slope to improve the monitoring accuracy of the slope and prevent it from being interfered with. The mounting plate 902 and the mounting shell 8 cooperate with each other to make the locking block 903 enter the fixed lock hole 10, and then the rotating sleeve 904 is rotated. The rotating sleeve 904 is used to control the movement of the movable ring 905 and the push rod 907. The push rod 907 moves to make the top plate 906 squeeze the inner wall of the mounting shell 8, thereby improving the stability of the connection between the mounting shell 8 and the mounting plate 902. There is no need to customize the extended pipe body 1, and it occupies little space after disassembly, which can be convenient for transportation and storage.

[0067] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the technical concepts invented herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0068] It should be understood that the present invention is not limited to the exact structure described above and shown in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the present invention is limited only by the scope of the appended claims.

Claims

1. A strain monitoring device using an optical fiber sensor, comprising a pipe body (1), an optical fiber sensor (4) and a data acquisition system, characterized in that: The tube body (1) is provided with a downward spiral groove (3) and an upward spiral groove (2) on the side wall thereof, the downward spiral groove (3) and the upward spiral groove (2) being arranged in an alternating and symmetrical manner, the optical fiber sensor (4) being arranged in a continuous spiral manner along the downward spiral groove (3) and the upward spiral groove (2), the data acquisition system being connected to the optical fiber sensor (4), and being able to obtain strain data in real time through signals transmitted by the optical fiber sensor (4); The optical fiber sensor (4) adopts a distributed optical fiber sensor, the data acquisition system is a distributed optical fiber sensing system, the distributed optical fiber sensing system includes a light source and a signal processing module, and the two ends of the optical fiber sensor (4) are respectively connected to the light source and the signal processing module; the radius of the upward spiral groove (2) and the downward spiral groove (3) are any value between 1cm and 5cm, the spiral pitch of the downward spiral groove (3) is 10cm, the spiral pitch of the upward spiral groove (2) is the same as the spiral pitch of the downward spiral groove (3), and the tube The body (1) is a cylindrical structure, and the inner diameter of the tube body (1) is 4.5 cm, the outer diameter is 5.0 cm, and the length is 55 cm. The optical fiber sensor (4) is arranged in a serpentine structure in the descending spiral groove (3) and the ascending spiral groove (2) through epoxy resin. The descending spiral groove (3) spirally descends from the head end of the tube body (1) to the end of the tube body and is connected to the ascending spiral groove (2); the ascending spiral groove (2) spirally ascends from the end of the tube body (1) back to the head end of the tube body (1). The outer surface of the tube body (1) is provided with an anti-corrosion layer. Both sides of the tube body (1) are fixedly connected to a connecting shell (5), the inner cavity of the connecting shell (5) is provided with a movable plate (6), the bottom of the movable plate (6) is fixedly connected to an anti-loosening component (7), the bottom of the anti-loosening component (7) passes through the outer side of the connecting shell (5); the anti-loosening component (7) includes a ground plug (701), the top of the ground plug (701) is fixedly connected to the movable plate (6), the top of the ground plug (701) passes through the connecting shell (5) and is fixedly connected to a pointed cone (702), and the front and rear sides of the inner cavity of the ground plug (701) are movable. A push plate (703) is connected, and the tops of the opposite sides of the two push plates (703) are fixedly connected to a triangular block (704), a tension spring (705) is fixedly connected between the two push plates (703), a screw rod (706) is provided between the two triangular blocks (704), and the bottom of the screw rod (706) is fixedly connected to a conical block (707); the top of the screw rod (706) is fixedly connected to a hexagonal head (710), and the opposite sides of the two push plates (703) are fixedly connected to a limiting cone (711), and the front and rear sides of the ground pipe (701) are both provided with movable openings; The two connecting shells (5) are fixedly connected to a mounting shell (8) and a locking assembly (9) on one side away from the tube body (1), and a fixed lock hole (10) is provided on the surface of the mounting shell (8); the locking assembly (9) comprises a threaded column (901), the left side of the threaded column (901) is fixedly connected to the connecting shell (5), the right side of the threaded column (901) is fixedly connected to a mounting plate (902), the surface of the mounting plate (902) is fixedly connected to a locking block (903), and the surface of the threaded column (901) is threadedly connected to a rotating sleeve (904). The right side of the rotating sleeve (904) is movably connected to a movable ring (905); the inner cavity of the mounting plate (902) is provided with a top plate (906), and the top and bottom of the left side of the top plate (906) are fixedly connected to a push rod (907), and the left side of the push rod (907) passes through the mounting plate (902) and is fixedly connected to the movable ring (905); the surface of the rotating sleeve (904) is fixedly connected to an anti-slip bump, and the top and bottom of the left side of the mounting plate (902) are provided with through holes for use with the push rod (907), and the right side of the top plate (906) is fixedly connected to a protective pad.

2. The strain monitoring device using an optical fiber sensor according to claim 1, characterized in that: The signal processing module can collect strain data in real time and transmit it to the data processing platform. The data processing platform can establish a mapping relationship between strain and rock displacement to achieve real-time monitoring and analysis of strain data. The data processing platform is equipped with an early warning device that can emit an alarm signal based on the strain data.

3. The strain monitoring device using an optical fiber sensor according to claim 1, characterized in that: The front and rear sides of the inner cavity of the connecting shell (5) are fixedly connected to guide blocks, the front and rear sides of the movable plate (6) are provided with guide grooves for use with the guide blocks, and the front and rear sides of the bottom of the connecting shell (5) are fixedly connected to ground cones.

4. The strain monitoring device using an optical fiber sensor according to claim 1, characterized in that: The top of the movable plate (6) is fixedly connected to a fixed tube (708), the top of the fixed tube (708) passes through the outside of the connecting shell (5), the top of the screw rod (706) passes through the inner cavity of the fixed tube (708), the surface of the screw rod (706) is threadedly connected to a threaded sleeve (709), and both sides of the threaded sleeve (709) are fixedly connected to the inner wall of the fixed tube (708).

5. The strain monitoring device using an optical fiber sensor according to claim 1, characterized in that: The groove depths of the descending spiral groove (3) and the ascending spiral groove (2) are both 2 mm, and are designed to have 5 turns.

Images