Component crack measuring device and method based on dragonfly compound eye imaging

Abstract

The invention discloses a component crack measuring device based on dragonfly compound eye imaging, which comprises two brackets, a distance adjusting device, a linkage structure, a triboelectric slip sensor, an elastic device and an image recognition device, and is characterized in that the two brackets respectively surround the outer side of a concrete test piece; the outer sides of the two supports are connected through a lockable distance adjusting device. The same side faces of the two supports are connected through two oppositely-arranged linkage structures. A plurality of elastic devices are arranged on the same side surfaces of the two brackets and the corresponding linkage structures, each elastic device is provided with a triboelectric slip sensor, and a friction head of the triboelectric slip sensor is propped against the surface of the concrete test piece; the triboelectric slip sensor is electrically connected with an external data acquisition module; image recognition devices are arranged on the same side faces of the two supports. According to the invention, quasi-continuous and multi-point synchronous monitoring of the width change of the concrete crack can be realized.

Description

Technical Field

[0001] The present application relates to the technical field of concrete testing, and in particular to a component crack measurement device based on dragonfly compound eye imaging. Background Art

[0002] In the fields of civil engineering and building structure health monitoring, crack measurement of concrete components is a key step in evaluating structural safety and durability.

[0003] Existing technologies, such as crack meters, strain sensors, or manual visual inspections, can only perform intermittent point-by-point measurements of cracks and are unable to achieve multi-point synchronous measurements. This results in discontinuous monitoring data and makes it difficult to capture the dynamic process of crack expansion.

[0004] In addition, existing crack measurement of concrete components relies solely on a single type of measurement. This single type of measurement not only displays a single content, but is also easily affected by the test environment, resulting in inaccurate measurement results. Summary of the Invention

[0005] The present application aims to solve at least one of the technical problems in the above-mentioned technology to a certain extent.

[0006] To achieve the above-mentioned objectives, the first aspect of the present application proposes a component crack measurement device based on dragonfly compound eye imaging, comprising: a bracket, a spacing adjustment device, a linkage structure, a triboelectric slip sensor, an elastic device and an image recognition device, wherein the two brackets are respectively enclosed on the outside of the concrete specimen, and the outsides of the two brackets are connected by the lockable spacing adjustment device; the same side surfaces of the two brackets are connected by two oppositely arranged linkage structures; a plurality of elastic devices are provided on the same side surfaces of the two brackets and the corresponding linkage structures, each elastic device is provided with the triboelectric slip sensor, and the friction head of the triboelectric slip sensor abuts the surface of the concrete specimen; the triboelectric slip sensor is electrically connected to an external data acquisition module; the image recognition device is provided on the same side surfaces of the two brackets.

[0007] In addition, the component crack measurement device based on dragonfly compound eye imaging proposed in the present application may also have the following additional technical features:

[0008] As a further description of the above technical solution: each of the brackets includes two diagonally arranged right-angle plates, and both ends of the two right-angle plates are respectively locked by bolts.

[0009] As a further description of the above technical solution: the spacing adjustment device includes a rotating arm and a damping knob, wherein one end of the two rotating arms is pivotally connected to the right-angle ends of the two brackets respectively; and the other ends of the two rotating arms are connected through the damping knob.

[0010] As a further description of the above technical solution: the linkage structure includes a linkage plate, a gear and a fixed plate, wherein one end of the two linkage plates are pivotally connected to the same side of the two brackets respectively; the other ends of the two linkage plates are respectively provided with gears that mesh with each other; the two gears are connected through the fixed plate; wherein a mounting portion is provided on the linkage plate to install the triboelectric slip sensor.

[0011] As a further description of the above technical solution: the elastic device includes a rod sleeve, a moving rod, a spring and a limit head, wherein the rod sleeve is arranged on the bracket; the moving rod passes through the rod sleeve and is slidably connected to the rod sleeve; one end of the moving rod is connected to the friction electric slip sensor, and the other end is provided with a limit head; the spring is sleeved on the moving rod, and the two ends of the spring are respectively connected to the limit head and the bracket.

[0012] As a further description of the above technical solution: the triboelectric slip sensor includes a friction head, a charge sensing unit, a signal amplification unit and a signal conversion unit, wherein the charge sensing unit is used to receive the friction charge generated by the relative slip between the friction head and the surface of the concrete specimen when the concrete specimen cracks, and convert it into an original electrical signal; the signal amplification unit is used to enhance the amplitude of the original electrical signal; and the signal conversion unit is used to convert the amplitude-enhanced electrical signal into a digital signal.

[0013] As a further description of the above technical solution: the image recognition device includes a camera, an image processing unit and a storage unit; multiple cameras are respectively arranged on the same side of two brackets; the image processing unit is used to splice the fields of view of adjacent cameras through an image fusion algorithm to generate a crack image and calculate the crack width value in the crack image; the storage unit is used to store the crack image and the corresponding crack width value.

[0014] To achieve the above-mentioned purpose, the second aspect of the present application proposes a measurement method of a component crack measurement device based on dragonfly compound eye imaging, comprising: adjusting the spacing between two brackets through a spacing adjustment device so that the two brackets are located on both sides of the expected cracking area of ​​the concrete specimen, and allowing the image processing device to cover the expected cracking area of ​​the concrete specimen; the linkage structure follows the spacing adjustment of the brackets to make adaptive adjustments so that multiple triboelectric slip sensors are located on the outer circle of the expected cracking area of ​​the concrete specimen; the triboelectric slip sensor generates crack displacement data according to the cracking condition of the concrete specimen; the image recognition device generates a crack image according to the cracking condition of the concrete specimen, and calculates the crack width value.

[0015] As a further description of the above technical solution: the triboelectric slip sensor generates crack displacement data according to the cracking condition of the concrete specimen, including: the friction head of the triboelectric slip sensor and the surface of the concrete specimen undergo relative sliding to generate friction charges; the charge sensing unit converts the friction charges into original electrical signals; the signal amplification unit performs amplitude enhancement on the original electrical signals; the signal conversion unit converts the amplitude enhanced electrical signals into digital signals; the data acquisition module synchronously acquires the digital signals of the triboelectric slip sensors on the same side of the bracket and the corresponding linkage structure; based on a pre-calibrated displacement conversion coefficient, the electrical signals are converted into crack displacement data through a displacement synthesis algorithm; and the crack displacement data are stored in time series.

[0016] As a further description of the above technical solution: the image recognition device generates a crack image based on the cracking condition of the concrete specimen and calculates the crack width value, including: multiple cameras synchronously collecting local images of the crack area of ​​the concrete specimen; based on a pre-calibrated camera spatial position and perspective mapping relationship, adjacent local images are subjected to visual field fusion to generate a crack image of the crack area; crack contours are extracted from the crack image through a crack recognition algorithm, and a real-time crack width value of the crack contour is calculated based on pixel and physical size conversion coefficients; and crack images and crack width values ​​are stored in a time series.

[0017] According to the component crack measurement device based on dragonfly compound eye imaging of the present application, by setting multiple triboelectric slip sensors on the outer ring of the expected cracking area of ​​the concrete specimen, the displacement changes of each measuring point can be recorded in real time to obtain more comprehensive dynamic data of crack development; through the set image recognition device, an intuitive image of the cracks in the concrete component can be provided. Through the combination of the two, multi-dimensional measurement of the cracks in the concrete component can be achieved, and the measurement results of the two can be verified with each other, thereby improving the reliability and accuracy of the measurement results.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0020] Figure 1 This is a schematic structural diagram of a component crack measurement device based on dragonfly compound eye imaging according to one embodiment of the present application;

[0021] Figure 2 This is a schematic diagram of the main structure of a component crack measurement device based on dragonfly compound eye imaging according to one embodiment of the present application;

[0022] Figure 3 This is a schematic top view of a component crack measurement device based on dragonfly compound eye imaging according to one embodiment of the present application;

[0023] Figure 4 is a schematic diagram of an enlarged structure of a local area A according to an embodiment of the present application;

[0024] Figure 5 is a schematic diagram of a bracket structure according to an embodiment of the present application;

[0025] Figure 6 is an internal schematic diagram of a linkage structure according to one embodiment of the present application;

[0026] Figure 7 is a structural schematic diagram of a component crack measurement device based on dragonfly compound eye imaging according to another embodiment of the present application;

[0027] As shown in the figure:

[0028] 100. Bracket; 110. Right-angle plate; 120. Semicircular plate; 200. Spacing adjustment device; 210. Rotating arm; 220. Damping knob; 300. Linking structure; 310. Linking plate; 311. Mounting portion; 320. Gear; 330. Fixed plate; 400. Triboelectric slip sensor; 500. Elastic device; 510. Rod sleeve; 520. Moving rod; 530. Spring; 540. Limit head; 600. Image recognition device; 700. Concrete specimen. DETAILED DESCRIPTION

[0029] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0030] The component crack measurement device based on dragonfly compound eye imaging according to an embodiment of the present application is described below with reference to the accompanying drawings.

[0031] like Figures 1 to 3 As shown, the component crack measurement device based on dragonfly compound eye imaging of an embodiment of the present application may include a bracket 100, a spacing adjustment device 200, a linkage structure 300, a triboelectric slip sensor 400, an elastic device 500 and an image recognition device 600.

[0032] The two brackets 100 are respectively enclosed on the outside of the concrete specimen 700 , and the outsides of the two brackets 100 are connected by a lockable spacing adjustment device 200 , and the same sides of the two brackets 100 are connected by two oppositely arranged linkage structures 300 .

[0033] A plurality of elastic devices 500 are provided on the same side of the two brackets 100 and the corresponding linkage structure 300. A triboelectric slip sensor 400 is provided on each elastic device 500, and the friction head of the triboelectric slip sensor 400 abuts against the surface of the concrete specimen 700. The triboelectric slip sensor 400 is electrically connected to an external data acquisition module. An image recognition device 600 is provided on the same side of the two brackets 100.

[0034] It should be noted that by adjusting the spacing adjustment device 200, the relative positions of the two brackets 100 can be changed, and when the two brackets 100 are adjusted in position, they can drive the linkage structure 300 to move in conjunction, thereby adjusting the position of the triboelectric slip sensor 400 on the linkage structure 300 to adapt to measurements with different spacing requirements.

[0035] Specifically, before the relevant staff measures the cracks of the concrete specimen 700, they first adjust the width of the two brackets 100 to a suitable position through the spacing adjustment device 200, that is, the two brackets 100 are unfolded on both sides of the expected cracking area of ​​the concrete specimen 700, and then the two brackets 100 are enclosed on the outside of the concrete specimen 700, and the friction head of the triboelectric slip sensor 400 is pressed against the surface of the concrete specimen 700 to achieve synchronous measurement of multiple sides of the concrete.

[0036] During the crack test, the concrete specimen 700 cracks, and the crack expansion causes the concrete surface to displace outward. Slip occurs between the concrete surface and the friction head of the triboelectric slip sensor 400, and friction charges are generated. Crack displacement data is generated by processing the friction charges; the crack is recorded and the crack width is calculated using an image processing device.

[0037] Relevant staff can not only realize synchronous measurement of multiple surfaces of concrete, but also perform multi-dimensional verification measurement of cracks through the triboelectric slip sensor 400 and image processing device. It can not only record the displacement changes of each measuring point and obtain more comprehensive dynamic data on crack development, but also verify the multi-dimensional data with each other to improve measurement precision and accuracy.

[0038] In one embodiment of the present application, Figure 1 As shown, the spacing adjustment device 200 includes a rotating arm 210 and a damping knob 220 .

[0039] One end of the two rotating arms 210 is pivotally connected to the two brackets 100 respectively, and the other ends of the two rotating arms 210 are connected via a damping knob 220 .

[0040] As a possible scenario, Figure 5 As shown, for the quadrangular prism concrete specimen 700, each bracket 100 includes two diagonally arranged right-angle plates 110, the two ends of the two right-angle plates 110 are respectively locked by bolts, and the two rotating arms 210 of the spacing adjustment device 200 are respectively connected to the right-angle ends of the two right-angle plates 110.

[0041] As another possible scenario, Figure 7 As shown, for a cylindrical concrete specimen 700, each bracket 100 includes two oppositely arranged semicircular plates 120, both ends of the two semicircular plates 120 are respectively locked by bolts, and the two rotating arms 210 of the spacing adjustment device 200 are respectively connected to the middle sections of the two semicircular plates 120.

[0042] In one embodiment of the present application, Figure 6 As shown, the linkage structure 300 includes a linkage plate 310 , a gear 320 and a fixed plate 330 .

[0043] Among them, one end of the two linking plates 310 is pivotally connected to the same side of the two brackets 100, and the other ends of the two linking plates 310 are respectively provided with mutually meshing gears 320, and the two gears 320 are connected through a fixed plate 330, wherein a mounting portion 311 is provided on the linking plate 310 for installing the friction electric slip sensor 400.

[0044] It should be noted that after the relevant staff loosens the damping knob 220 and pushes the bracket 100 to move, the two interlocking plates 310 cause the two meshing gears 320 to rotate due to the change in the distance between the brackets 100, thereby causing the two interlocking plates 310 to rotate synchronously in opposite directions, thereby achieving synchronous movement of the triboelectric slip sensors 400 on the two rotating plates, to ensure that the triboelectric slip sensors 400 on the two brackets 100 on the same side and the triboelectric slip sensors 400 on the corresponding rotating plates can always be located in the outer circle of the expected cracking area of ​​the concrete specimen 700.

[0045] In one embodiment of the present application, Figure 4 As shown, the elastic device 500 includes a rod sleeve 510 , a moving rod 520 , a spring 530 and a limiting head 540 .

[0046] Among them, the rod sleeve 510 is set on the bracket 100, the moving rod 520 passes through the rod sleeve 510 and is slidably connected to the rod sleeve 510, one end of the moving rod 520 is connected to the friction electric slip sensor 400, and the other end is provided with a limit head 540, the spring 530 is sleeved on the moving rod 520, and the two ends of the spring 530 are respectively connected to the limit head 540 and the bracket 100.

[0047] It should be noted that when the bracket 100 is installed outside the concrete specimen 700, one of the brackets 100 can be pushed toward the surface of the concrete component, so that the friction heads of the multiple triboelectric slip sensors 400 on the bracket 100 abut against the surface of the concrete component. At this time, the triboelectric slip sensor 400 pushes the moving rod 520 outward, so that the moving rod 520 slides in the rod sleeve 510, and the spring 530 is in a stretched state, and the friction head of the triboelectric slip sensor 400 is pressed against the surface of the concrete component through the reaction force.

[0048] In one embodiment of the present application, the triboelectric slip sensor 400 includes a friction head, a charge sensing unit, a signal amplification unit, and a signal conversion unit.

[0049] Among them, the charge sensing unit is used to receive the friction charge generated by the relative sliding between the friction head and the surface of the concrete specimen 700 when the concrete specimen 700 cracks, and convert it into an original electrical signal. The signal amplification unit is used to enhance the amplitude of the original electrical signal. The signal conversion unit is used to convert the amplitude-enhanced electrical signal into a digital signal.

[0050] It should be noted that the triboelectric slip sensors 400 on the same side of the two brackets 100 and the triboelectric slip sensors 400 on the corresponding linkage structure 300 can be a group and electrically connected to the data acquisition module to measure cracks on the corresponding side of the concrete specimen 700.

[0051] In one embodiment of the present application, the image recognition device 600 includes a camera, an image processing unit, and a storage unit.

[0052] Among them, multiple cameras are respectively arranged on the same side of the two brackets 100, the image processing unit is used to splice the fields of view of adjacent cameras through an image fusion algorithm to generate a crack image and calculate the crack width value in the crack image, and the storage unit is used to store the crack image and the corresponding crack width value.

[0053] It should be noted that the multiple cameras on the same side of the two brackets 100 are grouped together to measure cracks on the corresponding side of the concrete specimen 700.

[0054] The following describes the measurement method corresponding to the component crack measurement device based on dragonfly compound eye imaging in an embodiment of the present application with reference to the accompanying drawings.

[0055] The process includes: S100 , adjusting the distance between the two brackets 100 by the distance adjustment device 200 , so that the two brackets 100 are located on both sides of the expected cracking area of ​​the concrete specimen 700 , and making the image processing device 600 cover the expected cracking area of ​​the concrete specimen 700 .

[0056] It should be noted that relevant staff can adjust the expected cracking area according to different load types of the concrete specimen 700. For example, in the test of axial compression loading, the expected crack area is generally a longitudinal crack extending from the end to the middle; for example, in the test of bending loading, the expected crack area is generally a transverse vertical crack extending from the middle of the ground to the side. The spacing and specific position of the two brackets can be set by the relevant staff.

[0057] S200 , the linkage structure 300 performs adaptive adjustment following the spacing adjustment of the bracket 100 , so that the plurality of triboelectric slip sensors 400 are located on the outer circle of the expected cracking area of ​​the concrete specimen 700 .

[0058] It should be noted that the relevant staff can loosen the damping knob 220 and pull the bracket 100 to make the rotating arm 210 rotate accordingly, so that the two brackets 100 are symmetrically distributed on both sides of the expected cracking area of ​​the concrete specimen 700. When the bracket 100 is adjusted, since the meshing gear 320 on the linkage structure 300 can drive the two linkage plates 310 to rotate synchronously in the opposite direction, the two brackets 100 can be pushed in reverse to move synchronously closer to or away from each other, so that the two brackets 100 always remain on both sides of the expected crack area of ​​the concrete specimen 700.

[0059] S300 , the triboelectric slip sensor 400 generates crack displacement data according to the cracking condition of the concrete specimen 700 .

[0060] Specifically, in S301 , the friction head of the triboelectric slip sensor 400 and the surface of the concrete specimen 700 slide relative to each other to generate friction charges.

[0061] When cracking occurs in the expected crack area of ​​the concrete specimen 700, stress concentration occurs at the crack tip, driving the surfaces on both sides of the crack to undergo relative displacement. At this time, the friction head of the triboelectric slip sensor 400 fixed on the bracket 100 contacts the concrete surface, generating friction charges due to relative slip.

[0062] It should be noted that the friction head adopts high molecular polymer or metal oxide, taking advantage of its high triboelectric coefficient and wear resistance.

[0063] It can be understood that the amount of charge (Q) generated by slip is proportional to the slip displacement (ΔL), that is, Q = k×ΔL (k is the triboelectric coefficient, which is determined by the materials of the concrete specimen 700 and the friction head. For example, when the outer wall of the friction head is a polyimide film with a thickness of 50 μm, the triboelectric coefficient can usually be calibrated experimentally for the concrete specimen 700. C / m).

[0064] S302 , the charge sensing unit converts the friction charge into an original electrical signal.

[0065] It should be noted that the charge sensing unit (such as a capacitive or piezoelectric sensor) captures the friction charge and converts it into a voltage signal, namely the original electrical signal (V), through a charge amplifier. The original electrical signal (V) is proportional to the charge (Q): V=Q÷Cf, where Cf is the feedback capacitor (usually a fixed value, such as 100 pF). By measuring the original electrical signal (V), the charge (Q) value can be indirectly obtained, and the slip displacement (ΔL) can be inferred.

[0066] S303: The signal amplifying unit enhances the amplitude of the original electrical signal.

[0067] It should be noted that the original electrical signal is differentially amplified by the signal amplification unit to suppress common-mode noise (such as electromagnetic interference). The gain is set by external resistors, with a typical gain range of 100 to 1000 times. After amplification, the amplitude of the original electrical signal is increased to 0.1 to 5 V, meeting the subsequent analog-to-digital conversion requirements.

[0068] S304: The signal conversion unit converts the amplitude-enhanced electrical signal into a digital signal.

[0069] It should be noted that the amplified original electrical signal is converted into a digital signal by a 16-bit high-precision ADC chip (such as ADS1256).

[0070] S305 , the data acquisition module synchronously acquires digital signals from the triboelectric slip sensor 400 on the same side of the bracket 100 and the corresponding linkage structure 300 .

[0071] It should be noted that the data acquisition module uses the CAN bus to implement distributed data acquisition of multiple triboelectric slip sensor nodes (400 nodes). The main controller (such as STM32H7) sends synchronization instructions to trigger all ADCs to sample simultaneously, and aligns data from different channels through timestamps to eliminate transmission delay errors.

[0072] S306 , converting the digital signal into crack displacement data through a displacement synthesis algorithm.

[0073] It should be noted that based on the pre-calibrated sensor installation, the electrical signals of different sensors are mapped into a unified coordinate system, and the corresponding slip displacement (ΔL) is calculated through the original electrical signal (V).

[0074] S307. Store the crack displacement data in time series.

[0075] It should be noted that the crack displacement data is stored in CSV format, and the fields include timestamp, displacement value, ID of the triboelectric slip sensor 400, the group to which the triboelectric slip sensor 400 belongs, and the bracket 100 number. It can be uploaded to the cloud server through the 4G / 5G module to achieve remote monitoring.

[0076] S400 : The image recognition device 600 generates a crack image according to the cracking condition of the concrete specimen 700 and calculates the crack width value.

[0077] Specifically, in S401 , multiple cameras synchronously capture local images of the crack area of ​​the concrete specimen 700 .

[0078] It should be noted that before measuring the cracks of the concrete specimen 700, the camera parameter information (including spatial position coordinates, focal length, etc.) is calibrated through the calibration method. Multiple cameras on the same side of the two brackets 100 can be set as a group. All cameras in the group send synchronization signals through the main controller to ensure that the image acquisition timestamp error is ≤1 ms for subsequent image stitching.

[0079] S402: Perform visual field fusion on adjacent local images to generate a crack image of the crack area.

[0080] It should be noted that the ORB algorithm is used to extract image key points (corner points + descriptors) and match feature point pairs, and the RANSAC algorithm is used to eliminate mismatched points.

[0081] Based on the homography matrix, the local images are projected into a unified coordinate system to ensure geometric consistency, and the overlapping area is calculated to ensure seamless connection of the fused images. The feathering algorithm is used to eliminate the stitching seams and generate a high-resolution panoramic crack image.

[0082] S403 , extracting the crack outline from the crack image using a crack recognition algorithm, and calculating the real-time crack width value of the crack outline based on the pixel and physical size conversion coefficient.

[0083] It should be noted that after identifying the crack contour, the straight line segment in the main direction of the crack is extracted, and by calibrating the relationship between pixels and physical dimensions (for example, 100 pixels = 1 mm, which is preset in advance), the calibration coefficient is read in real time to ensure measurement accuracy. Sampling can be performed every 10 pixels along the main direction of the crack to calculate the local width. By integrating the data from multiple cameras, the real-time width value of the crack can be output.

[0084] S404: Store the crack images and crack width values ​​in time series.

[0085] It should be noted that the panoramic images of the cracks and the calculated crack width values ​​are stored in sequence according to the time sequence of the measurements, and a time series database is established to record the changes in crack width over time and associate them with the corresponding load states to form a complete historical record of crack development.

[0086] In summary, according to the component crack measurement device based on dragonfly compound eye imaging of the embodiment of the present application, by setting multiple triboelectric slip sensors on the outer ring of the expected cracking area of ​​the concrete specimen 700, it is possible to record the displacement changes of each measuring point in real time and obtain more comprehensive dynamic data on crack development; through the set image recognition device, an intuitive image of the cracks in the concrete component can be provided. Through the combination of the two, multi-dimensional measurement of the cracks in the concrete component can be achieved, and the measurement results of the two can be verified with each other, thereby improving the reliability and accuracy of the measurement results.

[0087] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0088] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0089] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A component crack measurement device based on dragonfly compound eye imaging, characterized in that: include: A bracket (100), a spacing adjustment device (200), a linkage structure (300), a triboelectric sliding sensor (400), an elastic device (500), and an image recognition device (600), wherein: The two brackets (100) are respectively enclosed on the outside of the concrete specimen (700), and the outsides of the two brackets (100) are connected via the lockable spacing adjustment device (200); The same side surfaces of the two brackets (100) are connected via two oppositely arranged linkage structures (300); A plurality of elastic devices (500) are provided on the same side surface of the two brackets (100) and the corresponding linkage structure (300), each elastic device (500) is provided with the triboelectric slip sensor (400), and the friction head of the triboelectric slip sensor (400) abuts against the surface of the concrete specimen (700); The triboelectric slip sensor (400) is electrically connected to an external data acquisition module; The image recognition device (600) is provided on the same side of the two brackets (100).

2. The component crack measurement device based on dragonfly compound eye imaging according to claim 1 is characterized in that: Each bracket (100) comprises two diagonally arranged right-angle plates (110), and both ends of the two right-angle plates (110) are respectively locked by bolts.

3. The component crack measurement device based on dragonfly compound eye imaging according to claim 1, characterized in that: The spacing adjustment device (200) comprises a rotating arm (210) and a damping knob (220), wherein: One end of the two rotating arms (210) is pivotally connected to the two brackets (100) respectively; The other ends of the two rotating arms (210) are connected via the damping knob (220).

4. The component crack measurement device based on dragonfly compound eye imaging according to claim 1, characterized in that: The linkage structure (300) comprises a linkage plate (310), a gear (320) and a fixed plate (330), wherein: One end of the two linkage plates (310) is pivotally connected to the same side of the two brackets (100); The other ends of the two linkage plates (310) are respectively provided with gears (320) that mesh with each other; The two gears (320) are connected via the fixing plate (330); Wherein, a mounting portion (311) is provided on the linkage plate (310) for mounting the triboelectric slip sensor (400).

5. The component crack measurement device based on dragonfly compound eye imaging according to claim 1, characterized in that: The elastic device (500) comprises a rod sleeve (510), a movable rod (520), a spring (530) and a limiting head (540), wherein: The rod sleeve (510) is arranged on the bracket (100); The moving rod (520) passes through the rod sleeve (510) and is slidably connected to the rod sleeve (510); One end of the moving rod (520) is connected to the triboelectric slip sensor (400), and the other end is provided with a limit head (540); The spring (530) is sleeved on the moving rod (520), and two ends of the spring (530) are respectively connected to the limiting head (540) and the bracket (100).

6. The component crack measurement device based on dragonfly compound eye imaging according to claim 1, characterized in that: The triboelectric slip sensor (400) comprises a friction head, a charge sensing unit, a signal amplification unit and a signal conversion unit, wherein: The charge sensing unit is used to receive the friction charge generated by the relative sliding between the friction head and the surface of the concrete specimen (700) when the concrete specimen (700) cracks, and convert it into an original electrical signal; The signal amplification unit is used to enhance the amplitude of the original electrical signal; The signal conversion unit is used to convert the amplitude-enhanced electrical signal into a digital signal.

7. The component crack measurement device based on dragonfly compound eye imaging according to claim 1, characterized in that: The image recognition device (600) comprises a camera, an image processing unit and a storage unit; The plurality of cameras are respectively arranged on the same side of the two brackets (100); The image processing unit is used to stitch the fields of view of adjacent cameras using an image fusion algorithm to generate a crack image and calculate the crack width value in the crack image; The storage unit is used to store the crack image and the corresponding crack width value.

8. The measurement method corresponding to the component crack measurement device based on dragonfly compound eye imaging according to any one of claims 1 to 7, comprising: The spacing between the two supports (100) is adjusted by a spacing adjustment device (200) so that the two supports (100) are located on both sides of the expected cracking area of ​​the concrete specimen (700), and the image processing device (600) covers the expected cracking area of ​​the concrete specimen (700); The linkage structure (300) performs adaptive adjustment following the spacing adjustment of the bracket (100), so that the plurality of triboelectric slip sensors (400) are located on the outer ring of the expected cracking area of ​​the concrete specimen (700); The triboelectric slip sensor (400) generates crack displacement data according to the cracking condition of the concrete specimen (700); The image recognition device (600) generates a crack image according to the cracking condition of the concrete specimen (700) and calculates the crack width value.

9. The measuring method according to claim 8, characterized in that: The triboelectric slip sensor (400) generates crack displacement data according to the cracking condition of the concrete specimen (700), including: The friction head of the triboelectric slip sensor (400) and the surface of the concrete specimen (700) slide relative to each other to generate friction charges; The charge sensing unit converts the triboelectric charge into a raw electrical signal; The signal amplification unit enhances the amplitude of the original electrical signal; The signal conversion unit converts the amplitude-enhanced electrical signal into a digital signal; The data acquisition module synchronously acquires digital signals from the triboelectric slip sensor (400) on the same side of the bracket (100) and the corresponding linkage structure (300); The digital signal is converted into crack displacement data through displacement synthesis algorithm; Store the crack displacement data in time series.

10. The measuring method according to claim 8, characterized in that: The image recognition device (600) generates a crack image according to the cracking condition of the concrete specimen (700), and calculates the crack width value, including: Multiple cameras synchronously capture local images of crack areas of the concrete specimen (700); Perform visual field fusion on adjacent local images to generate a crack image of the crack area; The crack contour is extracted from the crack image through the crack recognition algorithm, and the real-time crack width value of the crack contour is calculated based on the pixel and physical size conversion coefficient; The crack images and crack width values ​​are stored in time series.

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