A fiber grating sensor

Abstract

The utility model provides a kind of fiber grating sensor, including the fiber grating sensor body being installed in the bottom end of fixed plate, the top of fiber grating sensor body is connected with mounting seat, the top of mounting seat is provided with lower annular cylinder, the bottom end of fixed plate is provided with upper annular cylinder;The outer wall of upper annular cylinder is opened with L type groove symmetrically, the inner wall of lower annular cylinder is provided with limit block symmetrically, and two groups of limit block and L type groove are alternately arranged.The utility model is through the nesting plug-in cooperation of upper annular cylinder and lower annular cylinder, and the rotation locking path of L type groove and limit block, realize the " push in + rotation " two-step installation of fiber grating sensor body;By setting locking mechanism and limit block, after lower annular cylinder rotates in place, cooperate the automatic locking function of locking mechanism, limit and fix lower annular cylinder, so that the quick installation and disassembly of fiber grating sensor body are realized, and labor intensity is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of fiber optic grating sensor technology, and more specifically, it relates to a fiber optic grating sensor. Background Technology

[0002] Fiber Bragg grating (FBG) sensors, as key optical sensing devices in modern engineering monitoring, occupy an irreplaceable position in scenarios such as structural health monitoring and precise environmental parameter measurement due to their superior performance. In the field of bridge monitoring, they can accurately capture key indicators such as expansion joint displacement, main beam deflection changes, crack propagation trends, tower deformation amplitude, and cable tension status, providing core data support for bridge structural safety assessment and life prediction. Their inherent high integration, long-distance signal transmission capability, micron-level measurement accuracy, long-term stable operation, strong adaptability to complex environments, lightweight structural design, and unique advantages such as immunity to light intensity fluctuations make them the preferred equipment in large-scale engineering monitoring systems.

[0003] Traditional fiber Bragg grating sensors still have significant limitations in installation: their connection to the mounting base mostly relies on bolt fastening, requiring the individual tightening or loosening of multiple bolts during disassembly and maintenance. In space-constrained conditions (such as inside bridge box girders or cable anchorage zones), this method is not only cumbersome and time-consuming, severely limiting maintenance efficiency, but also prone to component loss during disassembly due to the large number of bolts. This increases maintenance costs and may also lead to decreased installation stability, thus affecting the sensor's monitoring accuracy. Therefore, this paper researches and improves upon existing structures and shortcomings to provide a fiber Bragg grating sensor with greater practical value. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a fiber Bragg grating sensor, which is achieved by the following specific technical means:

[0005] A fiber Bragg grating sensor includes a fiber Bragg grating sensor body mounted on the bottom of a fixed plate. A mounting base is connected to the top of the fiber Bragg grating sensor body. A lower annular cylinder is located at the top of the mounting base. An upper annular cylinder is located at the bottom of the fixed plate, and the inner diameter of the lower annular cylinder is the same as the outer diameter of the upper annular cylinder. The outer wall of the upper annular cylinder has symmetrically formed L-shaped grooves, and the inner wall of the lower annular cylinder has symmetrically formed limiting blocks that slide and engage with the L-shaped grooves. The upper annular cylinder has mounting grooves on one side of the top of the horizontal sections of both sets of L-shaped grooves, and each mounting groove has a locking mechanism inside.

[0006] As a preferred embodiment of the present invention, the locking mechanism includes telescopic rods that are vertically installed inside the two sets of mounting slots. Each telescopic rod has a limiting plate installed at its bottom end, and each limiting plate has a locking block installed at its bottom end. Each mounting slot has a through groove at its bottom end for the locking block to protrude. Furthermore, one side of the locking block that descends to the bottommost end is in contact with an outer side wall of the limiting block.

[0007] As a preferred technical solution of this utility model, springs are fitted on the outer side of the telescopic rods, and the two ends of the springs are respectively abutted against the inner top wall of the limiting plate and the mounting groove; the upper annular cylinder has a connected sliding groove on one side of each of the two sets of mounting grooves, and one side of the limiting plate extends to the outside of the sliding groove and is fixedly installed with a sliding key, and the surface of the sliding key is provided with anti-slip texture.

[0008] As a preferred embodiment of this utility model, each side of the locking block is provided with an inclined surface, and the inclined surface is directed towards the vertical section of the L-shaped groove.

[0009] As a preferred embodiment of this utility model, the outer wall of the lower annular cylinder is provided with marking strips corresponding to the two sets of limiting blocks.

[0010] As a preferred technical solution of this utility model, the outer side of the upper annular cylinder is provided with guide plates corresponding to the vertical sections of the two sets of L-shaped grooves. The two sets of guide plates are provided with slots on the side facing the outer wall of the lower annular cylinder, and the marking strips are inserted into the slots.

[0011] As a preferred embodiment of this utility model, the top of the fixing plate has multiple sets of mounting holes at equal angles.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This invention achieves a two-step installation of the fiber Bragg grating sensor body through a nested interlocking of the upper and lower annular cylinders and a rotational locking path between the L-shaped groove and the limiting block. By setting up a locking mechanism and a limiting block, the lower annular cylinder can be automatically locked and fixed after it rotates into place, thus enabling rapid installation and disassembly of the fiber Bragg grating sensor body, which is more convenient and faster than the traditional bolt connection method. The slot of the marking strip and the guide plate provides clear guidance for the installation process, ensuring that the limiting block accurately enters the L-shaped groove, avoiding blind installation and further improving installation efficiency and accuracy. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the three-dimensional structure of this utility model. Figure 1 .

[0015] Figure 2 This is a schematic diagram of the three-dimensional structure of this utility model. Figure 2 .

[0016] Figure 3 This is a partial structural diagram of the present invention. Figure 1 .

[0017] Figure 4 This is a partial structural diagram of the present invention. Figure 2 .

[0018] Figure 5 This is a partial structural diagram of the present invention. Figure 3 .

[0019] Figure 6 This is a utility model Figure 5 Enlarged diagram of point A in the middle.

[0020] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0021] 1. Fixing plate; 2. Fiber optic grating sensor body; 3. Lower annular cylinder; 4. Upper annular cylinder; 5. L-shaped groove; 6. Limiting block; 7. Locking mechanism; 701. Telescopic rod; 702. Limiting plate; 703. Locking block; 704. Spring; 705. Sliding key; 8. Marking strip; 9. Guide plate; 10. Mounting hole; 11. Mounting base. Detailed Implementation

[0022] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0023] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] Example:

[0026] As attached Figure 1 To be continued Figure 6 As shown:

[0027] This utility model provides a fiber Bragg grating sensor, including a fiber Bragg grating sensor body 2 mounted on the bottom of a fixed plate 1. A mounting base 11 is connected to the top of the fiber Bragg grating sensor body 2. A lower annular cylinder 3 is provided at the top of the mounting base 11. An upper annular cylinder 4 is provided at the bottom of the fixed plate 1, and the inner diameter of the lower annular cylinder 3 is the same as the outer diameter of the upper annular cylinder 4. The outer wall of the upper annular cylinder 4 is symmetrically provided with L-shaped grooves 5, and the inner wall of the lower annular cylinder 3 is symmetrically provided with limiting blocks 6 that slide and insert into the L-shaped grooves 5. The upper annular cylinder 4 has mounting grooves on one side of the top of the horizontal section of each of the two sets of L-shaped grooves 5, and a locking mechanism 7 is provided inside each mounting groove.

[0028] The locking mechanism 7 includes telescopic rods 701 that are vertically installed inside the two sets of mounting slots. Each telescopic rod 701 has a limiting plate 702 installed at its bottom end, and each limiting plate 702 has a locking block 703 installed at its bottom end. Each mounting slot has a through groove at its bottom end for the locking block 703 to protrude. When the locking block 703 is lowered to the bottom, one side of it is in contact with an outer side wall of the limiting block 6, forming a rigid block to prevent the limiting block 6 from rotating back. This ensures that the fiber optic grating sensor body 2 will not loosen during long-term use, thus guaranteeing the reliability of the measurement results.

[0029] The telescopic rod 701 is fitted with springs 704 on its outer side, and both ends of the springs 704 abut against the limiting plate 702 and the inner top wall of the mounting groove, respectively. The upper annular cylinder 4 has a connected sliding groove on one side of each of the two sets of mounting grooves. One side of the limiting plate 702 extends to the outside of the sliding groove and is fixedly installed with a sliding key 705. The surface of the sliding key 705 is provided with anti-slip texture. The elasticity of the springs 704 allows the locking block 703 to automatically reset and tightly fit against the limiting block 6, achieving the locking function without additional operation. The design of the sliding key 705 provides convenience for unlocking operations and improves the efficiency of equipment maintenance.

[0030] The locking block 703 has a bevel on one side, which faces the vertical section of the L-shaped groove 5. The bevel design allows the limiting block 6 to automatically push the locking block 703 open when it slides in the L-shaped groove 5 without manual intervention. When the limiting block 6 slides into place, the locking block 703 automatically resets and locks under the action of the spring 704, thus realizing the automation and speed of the installation process.

[0031] The outer wall of the lower annular cylinder 3 is provided with marking strips 8 corresponding to the two sets of limiting blocks 6. The marking strips 8 can provide a clear positioning reference for the installation process, reduce the adjustment time during the installation process, and improve the installation efficiency.

[0032] The upper annular cylinder 4 is provided with guide plates 9 on its outer side, which correspond to the vertical sections of the two sets of L-shaped grooves 5. The two sets of guide plates 9 are provided with slots on the side facing the outer wall of the lower annular cylinder 3, and the marking strips 8 are inserted into the slots. The cooperation between the guide plates 9 and the slots further improves the accuracy and convenience of installation, and can effectively guide the limiting block 6 to accurately enter the vertical section of the L-shaped groove 5, avoiding installation difficulties caused by angular deviation.

[0033] The top of the fixing plate 1 has multiple sets of mounting holes 10 at equal angles, which can be easily fixed on various mounting surfaces, enhancing the versatility and adaptability of the device.

[0034] The working principle of this embodiment:

[0035] First, fix the fixing plate 1 with the upper annular cylinder 4 to the mounting surface with its mounting hole 10. Then, fix the fiber optic grating sensor body 2 to the mounting base 11 with the lower annular cylinder 3. Next, align the marking strip 8 on the outer wall of the lower annular cylinder 3 and insert it into the slot of the guide plate 9 on the outer wall of the upper annular cylinder 4. During the alignment process, the limiting block 6 on the inner wall of the lower annular cylinder 3 is aligned with the vertical section of the L-shaped groove 5 on the outer wall of the upper annular cylinder 4. At the same time, when inserting, it can be ensured that the limiting block 6 accurately enters the vertical section of the L-shaped groove 5. At the same time, push the mounting base 11 with the lower annular cylinder 3 upward, so that the limiting block 6 on the inner wall of the lower annular cylinder 3 slides along the vertical section of the L-shaped groove 5 to the horizontal section. Then rotate the mounting base 11 so that the limiting block 6 on the inner wall of the lower annular cylinder 3 slides in the horizontal section of the L-shaped groove 5.

[0036] When the limiting block 6 slides to the position of the locking block 703 in the horizontal section, the inclined surface of the locking block 703 is squeezed, causing the locking block 703 to retract upward into the mounting groove. At the same time, the spring 704 is compressed. When the limiting block 6 completely passes the locking block 703, the spring 704 returns to its original position, pushing the locking block 703 downward, so that one side of the locking block 703 fits against the outer wall of the limiting block 6, thereby restricting the reverse sliding of the limiting block 6 and realizing the automatic locking and fixing of the fiber optic grating sensor body 2. When it is necessary to disassemble and maintain the fiber optic grating sensor body 2, the limiting plate 702 and the locking block 703 fixedly connected to the limiting plate 702 are pushed upward by pushing the sliding key 705, so that the locking block 703 is disengaged from the limiting block 6. Then, the lower annular cylinder 3 is rotated in the opposite direction, so that the limiting block 6 slides out along the horizontal section of the L-shaped groove 5, and then the lower annular cylinder 3 is pulled down to complete the disassembly.

[0037] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A fiber Bragg grating sensor, comprising a fiber Bragg grating sensor body (2) mounted on the bottom end of a fixed plate (1), characterized in that: The top of the fiber optic grating sensor body (2) is connected to a mounting base (11), the top of the mounting base (11) is provided with a lower annular cylinder (3), the bottom of the fixing plate (1) is provided with an upper annular cylinder (4), and the inner diameter of the lower annular cylinder (3) is the same as the outer diameter of the upper annular cylinder (4); the outer wall of the upper annular cylinder (4) is symmetrically provided with L-shaped grooves (5), and the inner wall of the lower annular cylinder (3) is symmetrically provided with limiting blocks (6) that slide and insert into the L-shaped grooves (5); the upper annular cylinder (4) is provided with mounting grooves on one side of the top of the horizontal section of the two sets of L-shaped grooves (5), and the inside of the mounting grooves is provided with locking mechanisms (7).

2. The fiber Bragg grating sensor as described in claim 1, characterized in that: The locking mechanism (7) includes telescopic rods (701) that are vertically installed inside the two sets of mounting slots. Each telescopic rod (701) has a limiting plate (702) installed at its bottom end. Each limiting plate (702) has a locking block (703) installed at its bottom end. Each mounting slot has a through groove at its bottom end for the locking block (703) to be exposed.

3. The fiber Bragg grating sensor as described in claim 2, characterized in that: The telescopic rod (701) is fitted with a spring (704) on its outer side, and the two ends of the spring (704) are respectively abutted against the inner top wall of the limiting plate (702) and the mounting groove; the upper annular cylinder (4) has a connected sliding groove on one side of the two sets of mounting grooves, and one side of the limiting plate (702) extends to the outside of the sliding groove and is fixedly installed with a sliding key (705), and the surface of the sliding key (705) is provided with anti-slip texture.

4. The fiber Bragg grating sensor as described in claim 2, characterized in that: Each of the locking blocks (703) has an inclined surface on one side, and the inclined surface faces the vertical section of the L-shaped groove (5).

5. The fiber Bragg grating sensor as described in claim 1, characterized in that: The outer wall of the lower annular cylinder (3) is provided with marking strips (8) corresponding to the two sets of limiting blocks (6).

6. The fiber Bragg grating sensor as described in claim 5, characterized in that: The outer side of the upper annular cylinder (4) is provided with guide plates (9) corresponding to the vertical sections of the two sets of L-shaped grooves (5). The two sets of guide plates (9) are provided with slots on the side facing the outer wall of the lower annular cylinder (3), and the marking strips (8) are inserted into the slots.

7. The fiber Bragg grating sensor as described in claim 1, characterized in that: The top of the fixing plate (1) has multiple sets of mounting holes (10) at equal angles.

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