An ultralong gauge length strain sensing device

Abstract

The utility model discloses a kind of super-long gauge length strain sensing devices, the super-long gauge length strain sensing device includes support assembly, encapsulation component, displacement sensitive component, detection component and adjusting component, support assembly includes first support and second support;Encapsulation component includes outer tube and inner tube;Outer tube is set on first support, inner tube is set on second support, and inner tube is slidably arranged in outer tube;Window is opened on outer tube;Displacement sensitive component includes pixel mark point set at window and probe inserted in inner tube, probe extends at window, and displacement mark point is set on probe;Detection component includes zoomable camera;Camera is hung above window;Adjusting component is set on first support, and connected to camera;The utility model simple structure, low in cost, only need support assembly, encapsulation component and zoomable camera and can realize strain detection.

Description

Technical Field

[0001] This utility model relates to the field of strain detection technology, and in particular to an ultra-long gauge length strain sensing device. Background Technology

[0002] Nuclear power plants contain numerous structures, such as containment vessels, building walls, and reactor pits, which serve as safety barriers. Defects such as cracks, dents, and fissures on the surfaces of these structures pose significant potential risks to the safety of the nuclear power plant. In the field of structural health monitoring, strain is of paramount importance. By measuring and analyzing the strain of materials or structures, it is possible to assess how the structure changes under stress, thereby evaluating key parameters such as mechanical properties, failure behavior, crack propagation, residual stress, and fatigue information. This information is crucial for the design, manufacture, maintenance, and repair of various engineering structures. For example, in the field of building structures, strain measurement can be used to monitor structural deformation, cracks, and damage, enabling early detection and resolution of problems, and ensuring the safety and stability of the structure.

[0003] Among related technologies, strain measurement methods include resistance strain gauges, extensometers, vibrating wire strain gauges, and fiber optic sensors, all of which can achieve high-precision strain measurement. Resistance strain gauges, however, often use paper or adhesive substrates, making them susceptible to environmental influences. They are mostly disposable and can only measure strain at the bonded area, making them unsuitable for large-area monitoring. Their accuracy is generally low, and they are easily affected by environmental interference. Extensometers are easy to operate and highly accurate, but their clamping ends can only hold small structures such as plates and rods, making them unsuitable for strain measurement of large structures. Vibrating wire strain gauges are highly sensitive and low-cost, but their accuracy is generally low, their anti-interference ability is weak, and their application range is narrow. Fiber optic sensors offer high accuracy and strong anti-interference capabilities, but they require expensive demodulation equipment and specialized knowledge to operate. Most of these strain measurement methods are only suitable for experimental use or application in important engineering structures, and are difficult to extend to strain monitoring of structures in nuclear power plants. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an ultra-long gauge length strain sensing device.

[0005] The technical solution adopted by this utility model to solve its technical problem is: An ultra-long gauge length strain sensing device includes: A support assembly, the support assembly including a first support and a second support; An encapsulation assembly includes an outer tube and an inner tube; the outer tube is disposed on a first support, the inner tube is disposed on a second support, and the inner tube is slidably disposed inside the outer tube; a window is provided on the outer tube; A displacement-sensitive component, comprising pixel markers disposed at a window and a probe inserted into the inner tube, the probe extending at the window and having displacement markers disposed on the probe; A detection component, comprising a zoomable camera; the camera is suspended above the window to focus on the pixel marker and monitor the relative displacement of the displacement marker; An adjustment component is disposed on the first support and connected to the camera, for adjusting the height of the camera for focusing.

[0006] Furthermore, in the aforementioned ultra-long gauge length strain sensing device, the adjustment component preferably includes a connector, a groove is provided on the first support, the connector is disposed in the groove and connected to the camera.

[0007] Furthermore, the ultra-long gauge length strain sensing device preferably also includes an adsorption element, which is disposed at the bottom of the support assembly.

[0008] Furthermore, in the aforementioned ultra-long gauge length strain sensing device, the adsorption element is preferably a magnet and / or a vacuum chuck.

[0009] Furthermore, the ultra-long gauge length strain sensing device preferably also includes a protective cover, which is attached to the first support and the camera.

[0010] Furthermore, in the aforementioned ultra-long gauge length strain sensing device, preferably, the outer surfaces of the outer tube and the inner tube are respectively provided with coatings for preventing ultraviolet radiation.

[0011] Furthermore, in the aforementioned ultra-long gauge length strain sensing device, the support assembly preferably further includes a third support, and the outer tube is slidably inserted into the third support.

[0012] Furthermore, in the aforementioned ultra-long gauge length strain sensing device, the detection component preferably further includes an illumination lamp disposed at the camera lens; Or / and, the camera has an image and video acquisition module; Or / and, the camera has a network transmission module.

[0013] Furthermore, the ultra-long gauge length strain sensing device preferably also includes a limiting component installed inside the outer tube, which cooperates with the probe limiting component to guide the movement direction of the probe.

[0014] Furthermore, in the aforementioned ultra-long gauge length strain sensing device, the limiting component preferably includes a limiting plate, the limiting plate is installed at the window, a sliding channel is provided on the limiting plate, the probe slides within the sliding channel, and the pixel marker is set on the limiting plate; It also includes at least one limiting block, which is installed inside the outer tube. The limiting block has a through hole, the axis of which coincides with the axis of the sliding channel, and the probe passes through the through hole.

[0015] The following are the beneficial effects of implementing this utility model: The device has a simple structure and low cost. It only requires a support assembly, a packaging assembly, and an adjustable-focus camera to achieve strain detection. It has good anti-interference ability and good durability. It can monitor the small deformation of large-sized structures for a long time and can improve the real-time monitoring capability of key nuclear power equipment and structures, help detect structural damage early, extend the service life of facilities, and ensure operational safety. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 This is a three-dimensional structural schematic diagram of the ultra-long gauge length strain sensing device in some embodiments of this utility model; Figure 2 yes Figure 1 The diagram shows a three-dimensional structural representation of the protective shield. Figure 3 yes Figure 2 The diagram shows a cross-sectional view of the structure. Figure 4 yes Figure 2 A three-dimensional structural diagram of the first support, detection components, and part of the outer tube is shown. Figure 5 yes Figure 2 A partial three-dimensional structural diagram of the outer tube is shown. Detailed Implementation

[0017] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0018] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0019] In the following description, specific details such as particular system structures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the present invention. However, those skilled in the art will understand that the present invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0020] The technical solution adopted by this utility model to solve its technical problem is: like Figures 1 to 2 As shown, some embodiments of this utility model disclose an ultra-long gauge length strain sensing device, which includes a support assembly 10, an encapsulation assembly 20, a detection assembly 30, an adjustment assembly 40, an adsorption element 60, a protective cover 70, and a limiting assembly 80. The support assembly 10 includes a first support 11 and a second support 12, which are respectively mounted on the surface of a structure at intervals via the adsorption element 60. The encapsulation assembly 20 includes an outer tube 21 and an inner tube 22; the displacement sensing component includes pixel markers 810 and a probe 23; the outer tube 21 is disposed on the first support 11, and the inner tube 22 is disposed on the second support 12, with the inner tube 22 slidably disposed within the outer tube 21; a window 210 is provided on the outer tube 21, defining the pixel markers 810; the probe 23 is inserted into the inner tube 22 (see reference). Figure 3 ), and extends to window 210; displacement markers 230 are provided on probe 23 (please refer to Figure 5The detection component 30 is mounted on the first support 11 via the adjustment component 40. The detection component 30 is used to monitor the relative displacement of the displacement marker point 230, and the relative displacement represents the compressive and tensile strain of the structure. The adjustment component 40 is used to adjust the spacing between the detection component 30 and the pixel marker point 810. The protective cover 70 covers the first support 11, the detection component 30, and the window 210 for protection, making it adaptable to extreme environments. The limiting component 80 is installed inside the encapsulation component 20, and the probe 23 passes through the limiting component 80, which limits the direction of movement of the probe 23.

[0021] Specifically, the first support 11 and the second support 12 are installed at intervals on the surface of the structure. When the structure is subjected to tensile strain, the inner tube 22 synchronously drives the probe 23 to move away from the outer tube 21 (or the outer tube 21 moves away from the inner tube 22). The position of the displacement marker 230 (the spacing in the axial direction of the outer tube 21) changes. The change in displacement (relative displacement) of the displacement marker 230 is detected by the detection component 30, thereby detecting the tensile strain.

[0022] Conversely, when the structure experiences compressive strain, the inner tube 22 synchronously drives the probe 23 to move closer to the outer tube 21 (or the outer tube 21 moves closer to the inner tube 22), and the position of the displacement marker 230 (the spacing in the axial direction of the outer tube 21) changes. The change in the position (relative displacement) of the displacement marker 230 is monitored by the detection component 30, thereby detecting the compressive strain.

[0023] Refer again Figure 2 In some embodiments, the support assembly 10 further includes a third support 13, which is slidably disposed at the end of the outer tube 21 away from the first support 11, for supporting the outer tube 21. In other words, the end of the outer tube 21 away from the first support 11 is the middle position of the ultra-long gauge length strain sensor, so the third support 13 can support the middle position of the ultra-long gauge length strain sensor to prevent bending and deformation of the middle position. The distance between the first support 11 and the second support 12 is the gauge length of the sensor.

[0024] The outer surfaces of the outer tube 21 and the inner tube 22 are respectively coated to prevent ultraviolet radiation. The probe 23 should be made of a material with high rigidity and low coefficient of linear expansion to reduce the amount of deformation caused by friction and temperature changes.

[0025] like Figure 3 and Figure 4As shown, in some embodiments, the detection component 30 may include a camera 32 and an illumination lamp. The camera 32 is mounted on the first support 11 via an adjustment component 40. The camera 32 is zoomable, and its lens is suspended above the window 210. The camera 32 is used for focal length adjustment. The camera 32 focuses on pixel marker 810 and displacement marker 230 to monitor the relative displacement of the displacement marker 230. The illumination lamp is located at the lens of the camera 32 to illuminate the pixel marker 810 and displacement marker 230, ensuring no significant changes in light within the field of view of the camera 32, and also ensuring no shadows are cast due to the light source.

[0026] Specifically, when the structure deforms, the first support 11 and the second support 12 will change relative positions, thereby causing the inner tube 22 to move. The probe 23 moves synchronously with the inner tube 22, and the displacement marker point 230 will have a relative displacement. The relative displacement is captured by the camera 32. The staff can accurately identify the displacement changes on the structural surface by processing and recognizing the captured images and video information, and convert them into the average strain of the structural surface between the first support 11 and the second support 12 according to the gauge length.

[0027] In some embodiments, the geometric size of the field of view of the camera 32 can reach 4mm, with a magnification exceeding 20x, and the pixel marker point 810 and displacement marker point 230 can be clearly imaged within the field of view; the focal length of the camera 32 can be finely adjusted by rotating the lens to ensure clear imaging. The camera 32 has an image and video acquisition module; the camera 32 also has a network transmission module. The camera 32 has a high-definition imaging element CMOS, transmits images via network protocols, and can be configured with an IP address to form a monitoring network.

[0028] Refer again Figure 2 In some embodiments, the adjustment component 40 may include a connector. A groove 110 is provided on the first support 11, and the connector is disposed within the groove 110 and connected to the camera 32. Understandably, the connector is a bolt, inserted into the groove 110 and threaded into a threaded hole on the camera 32. When adjustment is needed, the bolt is unscrewed or loosened, and its height position is adjusted within the groove 110, thereby adjusting the distance between the camera 32 and the window 210. Of course, other connectors can also be used, such as lead screws, electric actuators, etc.

[0029] Refer again Figure 1In some embodiments, the adsorption element 60 may be a magnet and / or a vacuum suction cup. The adsorption element 60 is mounted on the bottom of the support assembly 10. Understandably, when the structure is concrete, the adsorption element 60 is a vacuum suction cup, which can be adsorbed onto the surface of the concrete structure. When the structure is steel, the adsorption element 60 is a magnet, which can be adsorbed onto the surface of the steel structure. Of course, the adsorption element 60 may also be a bolt, which is directly fixed to the structure by drilling holes.

[0030] like Figure 3 and Figure 5 As shown, in some embodiments, the limiting component 80 may include a limiting plate 81 and at least one limiting block 82. The limiting plate 81 is installed at the window 210, and a sliding channel 811 is provided on the limiting plate 81, within which the probe 23 slides (see reference). Figure 4 Pixel marker 810 is set on the limiting plate 81. Pixel marker 810 is a circular target of known size and is used for focusing calibration of the camera 32. Pixel marker 810 and displacement marker 230 are on the same plane. To ensure positioning accuracy, a black and white background should be used as much as possible. The limiting block 82 is installed inside the outer tube 21. The limiting block 82 has a through hole, the axis of which coincides with the axis of the sliding channel 811. The probe 23 passes through the through hole. The sliding channel 811 and the through hole control the movement direction of the probe 23, causing the probe 23 to move along the axis of the outer tube 21.

[0031] It should be noted that, for those skilled in the art, without departing from the concept of this utility model, the above-mentioned technical features can be freely combined, and several modifications and improvements can be made, all of which fall within the protection scope of this utility model.

Claims

1. A strain sensing device with an ultra-long gauge length, characterized in that, include: Support assembly (10), the support assembly (10) includes a first support (11) and a second support (12); The encapsulation component (20) includes an outer tube (21) and an inner tube (22); the outer tube (21) is disposed on a first support (11), the inner tube (22) is disposed on a second support (12), and the inner tube (22) is slidably disposed inside the outer tube (21); a window (210) is provided on the outer tube (21). The displacement sensitive component includes a pixel marker (810) disposed at the window (210) and a probe (23) inserted in the inner tube (22). The probe (23) extends at the window (210) and is provided with a displacement marker (230). The detection component (30) includes a zoomable camera (32); the camera (32) is suspended above the window (210) to focus on the pixel marker (810) and monitor the relative displacement of the displacement marker (230); An adjustment component (40) is disposed on the first support (11) and connected to the camera (32) for adjusting the height of the camera (32) for focusing.

2. The ultra-long gauge length strain sensing device according to claim 1, characterized in that, The adjustment component (40) includes a connector. A groove (110) is provided on the first support (11). The connector is disposed in the groove (110) and connected to the camera (32).

3. The ultra-long gauge length strain sensing device according to claim 1, characterized in that, It also includes an adsorption element (60), which is disposed at the bottom of the support assembly (10).

4. The ultra-long gauge length strain sensing device according to claim 3, characterized in that, The adsorption element (60) is a magnet and / or a vacuum suction cup.

5. The ultra-long gauge length strain sensing device according to claim 1, characterized in that, It also includes a protective cover (70) which covers the first support (11) and the camera (32).

6. The ultra-long gauge length strain sensing device according to claim 1, characterized in that, The outer surface of the outer tube (21) and the inner tube (22) are respectively provided with a coating for preventing ultraviolet rays.

7. The ultra-long gauge length strain sensing device according to claim 1, characterized in that, The support assembly (10) also includes a third support (13), on which the outer tube (21) is slidably inserted.

8. The ultra-long gauge length strain sensing device according to claim 1, characterized in that, The detection component (30) also includes an illumination lamp disposed at the lens of the camera (32); Or / and, the camera (32) has an image and video acquisition module; Or / and, the camera (32) has a network transmission module.

9. The ultra-long gauge length strain sensing device according to claim 1, characterized in that, It also includes a limiting component (80) installed inside the outer tube (21) and cooperating with the limiting of the probe (23) to guide the movement direction of the probe (23).

10. The ultra-long gauge length strain sensing device according to claim 1, characterized in that, The limiting component (80) includes a limiting plate (81), which is installed at the window (210). A sliding channel (811) is provided on the limiting plate (81), and the probe (23) slides in the sliding channel (811). The pixel marker (810) is set on the limiting plate (81). It also includes at least one limiting block (82), which is installed inside the outer tube (21). The limiting block (82) has a through hole, the axis of which coincides with the axis of the sliding channel (811), and the probe (23) passes through the through hole.

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