Surface type fiber grating strain sensor

Abstract

The utility model relates to the field of strain sensors, and discloses a surface type fiber grating strain sensor, which comprises a strain sensor body, a rubber bottom block, an axial damping piece and an adjustable mounting seat consisting of a mounting base, an adjusting screw rod and a clamping block, the two shaft ends of the strain sensor body are provided with two adjustable mounting seats which are distributed in an axial symmetry manner, the centers of the bottom ends of the two adjustable mounting seats are bonded with rubber bottom blocks, the opposite ends of the interiors of the two adjustable mounting seats are provided with axial damping parts, and the axial damping parts are correspondingly attached to the shaft ends of the strain sensor body. The adjustable mounting seat and the rubber bottom block are arranged on the two sides of the strain sensor, so that the strain sensor is effectively protected efficiently, the strain sensor is prevented from being influenced by external vibration, vibration transmitted to the sensor body is reduced, and the sensor is ensured to stably measure target strain without generating wrong data due to vibration interference; and the overall detection precision is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of strain sensors, specifically a surface fiber grating strain sensor. Background Technology

[0002] In the field of modern engineering technology, from large buildings and bridges to precision machinery and aerospace equipment, structural health monitoring and performance evaluation are of paramount importance. Surface fiber grating strain sensors, as an advanced measurement tool, have emerged and play a key role.

[0003] In traditional applications, strain sensors are typically fixed to a mounting base with bolts at both ends. However, this method has significant drawbacks. During installation or disassembly, the tightening force of the bolts can easily damage the ports of the strain sensor, greatly reducing its lifespan. Furthermore, traditional strain sensor mounting bases are limited in their applicability; they cannot effectively and flexibly fix strain sensors of different sizes. In practice, it is difficult to ensure the stability of the installation when encountering strain sensors with different dimensions. More importantly, traditional mounting bases do not provide buffering protection after fixing the strain sensor. When external vibrations or impacts occur, the strain sensor directly bears these external forces, leading to deviations in the measurement data and severely affecting the accuracy and stability of the measurement. To meet the requirements of engineering measurement for high-precision and high-stability strain measurement, we propose a surface-mounted fiber optic grating strain sensor. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a surface-mount fiber optic strain sensor, which solves the aforementioned problems.

[0006] (II) Technical Solution

[0007] To achieve the above-mentioned objectives, this utility model provides the following technical solution: a surface-mount fiber optic strain sensor, comprising a strain sensor body, a rubber base, and an axial damping component, as well as an adjustable mounting base consisting of a mounting base, an adjusting screw, and a clamping block. The strain sensor body has two axially symmetrically distributed adjustable mounting bases at its two axial ends. A rubber base is bonded to the center of the bottom end of each of the two adjustable mounting bases, and axial damping components are provided at opposite ends inside the two adjustable mounting bases. The axial damping components are correspondingly fitted to the axial ends of the strain sensor body.

[0008] Preferably, the adjustable mounting base body is a mounting base, and the mounting base is provided with a clamping block inside. The clamping block is corresponding to the inside of the mounting base and is engaged with the shaft end of the strain sensor body. The top end of the clamping block is provided with an adjusting screw, and the adjusting screw is threadedly connected to the top end of the mounting base.

[0009] Preferably, the mounting base has a threaded hole at the center of its top end, and a side box is provided on the side wall of the mounting base away from the strain sensor body. An axial damping component is placed inside the side box. Two sets of sliding grooves are provided on the two opposite side walls of the mounting base in an axisymmetrical arrangement. The side wall of the mounting base away from the side box has a rectangular opening. Fixing holes are provided at the four corners of the bottom end of the mounting base in an axisymmetrical arrangement. A mating groove for bonding with a rubber base block is provided at the center of the bottom end of the mounting base. Two sets of V-shaped base blocks are provided inside the mounting base in an axisymmetrical arrangement. Two inclined rubber pads are provided at the top of the V-shaped base blocks in an axisymmetrical arrangement.

[0010] Preferably, the clamping block consists of two parts: an auxiliary block and a V-shaped moving block. The V-shaped moving block is welded to the bottom of the auxiliary block, and two sliders are provided on the side of the bottom of the V-shaped moving block in an axially symmetrical manner. The sliders are slidably connected to the sliding groove. Two rubber pads are provided on the bottom of the V-shaped moving block in an inclined symmetrical manner. A mating groove is provided at the center of the top of the auxiliary block. The clamping block is placed between the two V-shaped bottom blocks, and the cross-sections of the V-shaped moving block and the V-shaped bottom blocks form a square structure.

[0011] Preferably, the bottom end of the adjusting screw is provided with a connecting block that is rotatably connected to the inner gap of the mating groove, and the outside of the adjusting screw is correspondingly connected to the threaded mating hole, and the top end of the adjusting screw is provided with a rotating handle.

[0012] Preferably, the axial damping component consists of four parts: a spring, a damping elastic component, a mating plate, and a sliding plate. The middle structure of the axial damping component is the damping elastic component. The mating plate and the sliding plate are welded to the two ends of the damping elastic component. The spring is sleeved on the outer side of the damping elastic component. The mating plate is welded to the inner wall of the side box on the side away from the damping elastic component. The sliding plate is attached to the shaft end of the strain sensor body on the side away from the damping elastic component.

[0013] (III) Beneficial Effects

[0014] Compared with the prior art, this utility model provides a surface-mount fiber optic strain sensor, which has the following advantages:

[0015] 1. This surface-mount fiber Bragg grating strain sensor offers flexible and stable installation. Its adjustable mounting base significantly enhances installation flexibility and stability. By rotating the adjusting screw, the clamping block can be driven to move vertically within the mounting base, adapting to strain sensor shafts of different sizes. The V-shaped moving block of the clamping block and the V-shaped bottom block shaft end within the mounting base form a square structure. This unique design not only ensures stable fixation of the strain sensor shaft end but also facilitates convenient operation during size adjustment. It also allows for rapid sensor disassembly and replacement, greatly improving work efficiency and meeting the sensor installation needs of various application scenarios.

[0016] 2. This surface-mount fiber optic strain sensor exhibits excellent vibration damping performance. The rubber base at the bottom of the mounting base fits snugly against the end face of the target object. Under pressure, it undergoes elastic deformation during vibration, effectively buffering the impact of vibration on the strain sensor body. Simultaneously, the rubber pads of the clamping block and the V-shaped base further enhance the vibration damping effect and protect the axial end of the strain sensor body. Furthermore, the axial damping component prevents axial movement of the strain sensor body's axial end. These vibration damping measures work together to reduce interference from external vibrations on the sensor's measurements, improving measurement accuracy and stability, ensuring long-term stable operation of the sensor, and providing reliable data support for engineering measurements. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the surface-mount fiber optic strain sensor structure of this utility model;

[0018] Figure 2 This is a cross-sectional schematic diagram of the surface-mount fiber optic strain sensor of this utility model;

[0019] Figure 3 This is a schematic diagram of the mounting base of this utility model;

[0020] Figure 4 This is a schematic diagram of the clamping block of this utility model;

[0021] Figure 5 This is a schematic diagram of the axial damping component of this utility model.

[0022] In the diagram: 1. Strain sensor body; 2. Mounting base; 3. Adjusting screw; 4. Clamping block; 5. Rubber base block; 6. Axial damping component; 7. Threaded mating hole; 8. Side box; 9. Fixing hole; 10. Slide groove; 11. V-shaped base block; 12. Rubber pad one; 13. V-shaped moving block; 14. Sliding block; 15. Rubber pad two; 16. Auxiliary block; 17. Mating groove; 18. Spring; 19. Damping elastic component; 20. Mating plate; 21. Sliding plate. Detailed Implementation

[0023] 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.

[0024] Please see Figure 1-5 A surface-mount fiber optic strain sensor includes a strain sensor body 1, a rubber base 5, and an axial damping component 6, as well as an adjustable mounting base consisting of a mounting base 2, an adjusting screw 3, and a clamping block 4. The strain sensor body 1 has two adjustable mounting bases symmetrically distributed at its two axial ends. The rubber base 5 is bonded to the center of the bottom end of each of the two adjustable mounting bases, and the opposing ends of the two adjustable mounting bases are provided with axial damping components 6, which are fitted to the axial ends of the strain sensor body 1.

[0025] Furthermore, the main body of the adjustable mounting base is a mounting base 2. The mounting base 2 has a clamping block 4 inside. The clamping block 4 is engaged with the shaft end of the strain sensor body 1 inside the mounting base 2. The top end of the clamping block 4 is provided with an adjusting screw 3, which is threadedly connected to the top end of the mounting base 2. The adjustable mounting base can drive the clamping block 4 to move vertically inside the mounting base 2 by rotating the adjusting screw 3, so that the adjustable mounting base can effectively fix the shaft end of the strain sensor body 1 of different sizes, improving the overall flexibility.

[0026] Furthermore, the mounting base 2 has a threaded hole 7 at the center of its top end, and a side box 8 is provided on the side wall of the mounting base 2 away from the strain sensor body 1. An axial damping component 6 is placed inside the side box 8. Two sets of axially symmetrical sliding grooves 10 are provided on both opposite side walls of the mounting base 2, and the side wall of the mounting base 2 away from the side box 8 has a rectangular opening. Four axially symmetrical fixing holes 9 are provided at the four corners of the bottom end of the mounting base 2. A mating groove for bonding with the rubber base block 5 is provided at the center of the bottom end of the mounting base 2. The mounting base 2 also has... There are two sets of V-shaped base blocks 11 arranged symmetrically on the axis. The top end of the V-shaped base block 11 is provided with two inclined rubber pads 12 arranged symmetrically on the axis. The rubber base block 5 is attached to the end face of the detection target and fixed by screws passing through the fixing holes 9. When the rubber base block 5 is squeezed, the rubber base block 5 will undergo elastic deformation when subjected to vibration, thereby buffering the impact of vibration on the strain sensor body 1, reducing the vibration transmitted to the strain sensor body 1, and ensuring that the strain sensor body 1 stably measures the target strain, rather than being interfered with by vibration and generating erroneous data.

[0027] Furthermore, the clamping block 4 consists of two parts: an auxiliary block 16 and a V-shaped moving block 13. The V-shaped moving block 13 is welded to the bottom of the auxiliary block 16, and two axially symmetrically distributed sliders 14 are provided on the side of the bottom of the V-shaped moving block 13. The sliders 14 are slidably connected to the sliding groove 10. Two inclined symmetrically distributed rubber pads 15 are provided at the bottom of the V-shaped moving block 13. A mating groove 17 is opened at the center of the top of the auxiliary block 16. The clamping block 4 is placed between the two V-shaped bottom blocks 11. The cross-section of the shaft end of the V-shaped moving block 13 and the V-shaped bottom block 11 forms a square structure. The square structure makes the shaft end of the strain sensor body 1 more stable, and the size adjustment is convenient. Disassembly and replacement are quick. The rubber pads 12 and 15, while cooperating with the rubber bottom block 5 to play a shock absorption role, effectively protect the shaft end of the strain sensor body 1.

[0028] Furthermore, the bottom end of the adjusting screw 3 is provided with a connecting block that is rotatably connected to the inner gap of the mating groove 17, and the outside of the adjusting screw 3 is connected to the threaded mating hole 7. The top end of the adjusting screw 3 is provided with a rotating handle. The adjusting screw 3 facilitates the effective adjustment of the clamping block 4, thereby adapting to strain sensor bodies 1 of different sizes.

[0029] Furthermore, the axial damping component 6 consists of four parts: a spring 18, a damping elastic component 19, a mating plate 20, and a sliding plate 21. The middle structure of the axial damping component 6 is the damping elastic component 19. The mating plate 20 and the sliding plate 21 are welded to the two ends of the damping elastic component 19, and the spring 18 is sleeved on the outer side of the damping elastic component 19. The side of the mating plate 20 away from the damping elastic component 19 is welded to the inner wall of the side box 8, and the side of the sliding plate 21 away from the damping elastic component 19 is attached to the shaft end of the strain sensor body 1. The axial damping component 6 can dampen the shaft end of the strain sensor body 1 and prevent axial movement.

[0030] Structural Description:

[0031] Strain sensor body 1: The strain sensor body 1 is the core component for measuring strain. Its two shaft ends are connected to an adjustable mounting base. It senses strain based on the fiber optic grating principle and converts strain into changes in optical signals.

[0032] Mounting base 2: Mounting base 2 is an adjustable mounting base body, which internally accommodates the clamping block 4, has a sliding groove 10 and a side box 8 on the side wall, and has a fixing hole 9 and a rubber bottom block 5 mating groove at the bottom for fixing and supporting the sensor.

[0033] Adjusting screw 3: The adjusting screw 3 is threaded to the top of the mounting base 2, connected to the bottom of the clamping block 4, and has a rotating handle on the top. Rotating it can drive the clamping block 4 to move to adapt to different sensor sizes.

[0034] Clamping block 4: Clamping block 4 consists of auxiliary block 16 and V-shaped moving block 13. It moves by sliding block 14 in cooperation with sliding groove 10 of mounting base 2, and is used to fix the shaft end of strain sensor body 1.

[0035] Rubber base 5: The rubber base 5 is bonded to the center of the bottom of the mounting base 2 and fits against the end face of the detection target. When squeezed, it deforms elastically during vibration to buffer vibration and protect the sensor.

[0036] Axial damping component 6: The axial damping component 6 is composed of spring 18, damping elastic component 19, etc., and is installed in the side box 8 of the mounting base 2, which is in contact with the shaft end of the strain sensor body 1 to prevent axial movement.

[0037] Threaded mating hole 7: The threaded mating hole 7 is located at the top center of the mounting base 2 and mates with the external part of the adjusting screw 3 to provide a threaded connection for the adjusting screw 3, thereby realizing the movement adjustment of the clamping block 4;

[0038] Side box 8: The side box 8 is set on the side wall of the mounting base 2, and the axial damping component 6 is placed inside, providing installation space for the axial damping component 6 and enhancing the vibration damping performance of the sensor.

[0039] Fixing holes 9: Fixing holes 9 are symmetrically distributed at the four corners of the bottom of the mounting base 2. They are used to pass screws through to fix the mounting base 2 to the detection target, ensuring a stable installation.

[0040] Slide 10: The slide 10 is symmetrically distributed on the two opposite side walls of the mounting base 2, and cooperates with the slider 14 of the clamping block 4 to guide the clamping block 4 to move vertically within the mounting base 2;

[0041] V-shaped base block 11: The V-shaped base block 11 is symmetrically distributed inside the mounting base 2. It has a rubber pad 12 on the top, which works with the V-shaped moving block 13 to fix the sensor shaft end and assist in shock absorption.

[0042] Rubber pad 12: Rubber pad 12 is symmetrically distributed on the top of V-shaped base block 11, working with rubber base block 5 and rubber pad 2 15 to absorb shock and protect the sensor shaft end.

[0043] V-shaped moving block 13: V-shaped moving block 13 is welded to the bottom of auxiliary block 16, and together with the cross-section of the shaft end of V-shaped bottom block 11, it forms a square structure, which fixes the sensor shaft end and facilitates size adjustment.

[0044] Slider 14: Slider 14 is symmetrically distributed on the bottom side of V-shaped moving block 13 and slides in cooperation with the slide groove 10 of mounting base 2 to ensure the smooth movement of clamping block 4;

[0045] Rubber pad 2 15: Rubber pad 2 15 is symmetrically distributed at the bottom of V-shaped moving block 13, and works with rubber pad 1 12 and rubber base block 5 to absorb shock and protect the sensor shaft end;

[0046] Auxiliary block 16: Auxiliary block 16 is part of clamping block 4. It has a mating groove 17 at the top to connect to the adjusting screw 3, and a V-shaped moving block 13 at the bottom to assist in fixing and adjusting.

[0047] Matching groove 17: The matching groove 17 is located at the top center of the auxiliary block 16 and rotates with the bottom connecting block of the adjusting screw 3 to realize the driving of the adjusting screw 3 on the clamping block 4;

[0048] Spring 18: Spring 18 is sleeved on the outside of damping elastic element 19 and assists in damping in axial damping element 6, working together with damping elastic element 19 to reduce axial vibration;

[0049] Damping elastic element 19: Damping elastic element 19 is the middle structure of axial damping element 6, with mating plate 20 and sliding plate 21 welded at both ends to consume vibration energy and achieve damping;

[0050] Matching plate 20: The matching plate 20 is welded to one end of the damping elastic element 19, and the side away from the damping elastic element 19 is welded to the inner wall of the side box 8 to fix the position of the axial damping element 6.

[0051] Sliding plate 21: The sliding plate 21 is welded to the other end of the damping elastic element 19, and the side away from the damping elastic element 19 is in contact with the shaft end of the strain sensor body 1 to transmit and buffer axial vibration.

[0052] Working Principle: The surface-mount fiber optic strain sensor is correctly installed according to the diagram. The operation of the surface-mount fiber optic strain sensor involves multiple stages, including sensor installation, fixation, and strain measurement. Firstly, regarding installation, the strain sensor body 1 has adjustable mounting bases at both ends, consisting of a mounting base 2, an adjusting screw 3, and a clamping block 4. The mounting base 2 is the main body of the adjustable mounting base, and it contains the clamping block 4. The clamping block 4 consists of an auxiliary block 16 and a V-shaped moving block 13. The slider 14 on the bottom side of the V-shaped moving block 13 slides into the groove 10 on the side wall of the mounting base 2, allowing the clamping block 4 to move within the mounting base 2. The adjusting screw 3 connects to the mating groove 17 on the top of the auxiliary block 16 of the clamping block 4 through a threaded hole 7 on the top of the mounting base 2. When the rotating handle on the top of the adjusting screw 3 is rotated, the adjusting screw 3 drives the clamping block 4 to move vertically within the mounting base 2, thereby effectively fixing the shaft ends of the strain sensor body 1 of different sizes. The V-shaped moving block of the clamping block 4... The cross-section of the V-shaped base block 11 inside the mounting base 2 forms a square structure with the V-shaped base block 13. This structure not only makes the fixation of the strain sensor body 1 shaft end more stable, but also makes size adjustment convenient and disassembly and replacement quick. In terms of vibration reduction, a rubber base block 5 is glued to the center of the bottom end of the mounting base 2. The rubber base block 5 fits against the end face of the detection target and is fixed by screws passing through the fixing holes 9 at the four corners of the bottom of the mounting base 2. At this time, the rubber base block 5 is compressed. When external vibration occurs, the rubber base block 5 will undergo elastic deformation, buffering the impact of vibration on the strain sensor body 1 and reducing the vibration transmitted to the strain sensor body 1, ensuring its stable measurement of target strain. At the same time, the rubber pad 15 at the bottom of the V-shaped moving block 13 of the clamping block 4 and the rubber pad 12 at the top of the V-shaped base block 11, together with the rubber base block 5, play a role in vibration reduction and effectively protect the shaft end of the strain sensor body 1. In addition, the side box 8 on the side wall of the mounting base 2 is equipped with an axial vibration damping component 6, which can dampen the shaft end of the strain sensor body 1 and prevent axial movement.

[0053] 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 surface-mount fiber optic strain sensor, comprising a strain sensor body (1), a rubber base (5), and an axial damping component (6), and an adjustable mounting base consisting of a mounting base (2), an adjusting screw (3), and a clamping block (4), characterized in that: The strain sensor body (1) has two adjustable mounting bases that are symmetrically distributed on both shaft ends. A rubber base block (5) is glued to the center of the bottom end of each of the two adjustable mounting bases. An axial damping component (6) is provided at the opposite ends of the two adjustable mounting bases. The axial damping component (6) is in contact with the shaft end of the strain sensor body (1).

2. The surface-mount fiber optic strain sensor according to claim 1, characterized in that: The adjustable mounting base is a mounting base (2). The mounting base (2) is equipped with a clamping block (4). The clamping block (4) is connected to the shaft end of the strain sensor body (1) inside the mounting base (2). The top end of the clamping block (4) is equipped with an adjusting screw (3), and the adjusting screw (3) is threadedly connected to the top end of the mounting base (2).

3. The surface-mount fiber optic strain sensor according to claim 2, characterized in that: The mounting base (2) has a threaded hole (7) at the center of its top end, and a side box (8) is provided on the side wall of the mounting base (2) away from the strain sensor body (1). An axial damping component (6) is placed inside the side box (8). Two sets of sliding grooves (10) are provided on the two opposite side walls of the mounting base (2) in an axisymmetrical arrangement. The side wall of the mounting base (2) away from the side box (8) has a rectangular opening. Fixing holes (9) are provided at the four corners of the bottom end of the mounting base (2) in an axisymmetrical arrangement. A mating groove for bonding with the rubber base block (5) is provided at the center of the bottom end of the mounting base (2). Two sets of V-shaped base blocks (11) are provided inside the mounting base (2) in an axisymmetrical arrangement. Two inclined rubber pads (12) are provided at the top end of the V-shaped base blocks (11).

4. A surface-mount fiber optic strain sensor according to claim 2, characterized in that: The clamping block (4) consists of two parts: an auxiliary block (16) and a V-shaped moving block (13). The V-shaped moving block (13) is welded to the bottom of the auxiliary block (16). The bottom side of the V-shaped moving block (13) is provided with two sliders (14) that are symmetrically distributed. The sliders (14) are slidably connected to the slide groove (10). The bottom of the V-shaped moving block (13) is provided with two rubber pads (15) that are symmetrically distributed. The center of the top end of the auxiliary block (16) is provided with a mating groove (17). The clamping block (4) is placed between the two V-shaped bottom blocks (11). The cross-sections of the V-shaped moving block (13) and the V-shaped bottom blocks (11) form a square structure.

5. A surface-mount fiber optic strain sensor according to claim 2, characterized in that: The bottom end of the adjusting screw (3) is provided with a connecting block that is rotatably connected to the inner gap of the mating groove (17), and the outside of the adjusting screw (3) is connected to the threaded mating hole (7). The top end of the adjusting screw (3) is provided with a rotating handle.

6. A surface-mount fiber optic strain sensor according to claim 3, characterized in that: The axial damping component (6) consists of four parts: a spring (18), a damping elastic component (19), a mating plate (20), and a sliding plate (21). The middle structure of the axial damping component (6) is the damping elastic component (19). The mating plate (20) and the sliding plate (21) are welded to the two ends of the damping elastic component (19). The spring (18) is sleeved on the outer side of the damping elastic component (19). The mating plate (20) is welded to the inner wall of the side box (8) on the side away from the damping elastic component (19). The sliding plate (21) is attached to the shaft end of the strain sensor body (1) on the side away from the damping elastic component (19).

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