Deformation monitoring device
By using a method of automatically identifying target plate information and a high-quality collimative infrared light source in the deformation monitoring device, the problem of insufficient manual input information and monitoring accuracy in the prior art is solved, and higher monitoring accuracy and convenience are achieved.
Patent Information
- Application Number
- CN202421402154.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-19
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-06-19
AI Technical Summary
During the early calibration process, existing deformation monitoring devices need to manually input the information of the target plate, and are affected by sun exposure and ordinary infrared light scattering, resulting in insufficient monitoring accuracy and convenience.
A deformation monitoring device was designed, using a combination of a target board, a camera and a computer to capture geometric marks on the target board through the camera, computer analysis and identification of the size and number of the target board, and use a vertical cavity surface emission laser to provide high collimation. and monochromatic infrared light sources to improve infrared reflected light intensity and shooting clarity.
It realizes automatic identification of target board information, reduces manual input operations, improves monitoring accuracy and convenience, and improves shooting clarity through high-quality infrared lighting.
Smart Images
Figure CN222505320U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of deformation monitoring technology, and in particular to a deformation monitoring device. Background Art
[0002] Bridges, tunnels, steel structures and other building structures will settle over time. The deformation state of the structure is crucial to the safety of the entire building. It is necessary to continuously and closely monitor and analyze the deformation state of key structures. Existing deformation measurements include contact measurement and non-contact measurement. Among non-contact measurements, photogrammetry is widely used in industrial inspection and other fields because of its advantages of comprehensive information acquisition, non-contact, and high speed.
[0003] In existing photogrammetry, a target plate is usually set at the location to be monitored. The target plate is provided with marker points that can be captured by the lens as light spots. Multiple marker points are usually distributed in a circular or square shape, which is convenient for extracting the regional center of the marker points and calculating deformation data. However, the existing measurement mechanism has the following disadvantages:
[0004] 1. Since the size of the target plate is not uniform, the target plate information, such as size and number, needs to be manually entered during the early calibration process;
[0005] 2. In the morning and afternoon, the sun shining on the camera lens will affect the camera's shooting effect;
[0006] 3. Ordinary infrared light is relatively scattered and can easily illuminate objects outside the target plate at a long distance. Utility Model Content
[0007] In view of this, the present application provides a deformation monitoring device, which solves the problems in the prior art and improves the ease of use and monitoring accuracy of the deformation monitoring device.
[0008] The deformation monitoring device provided in this application adopts the following technical solution:
[0009] A deformation monitoring device, comprising: a target plate, a camera and a computer;
[0010] The target board is fixed on the monitored object, and a target point and a logo pattern are arranged on the target board. The camera is installed in front of the target board at a preset distance, and the lens of the camera is aimed at the target board. The camera is used to collect image information of the target board, and the camera is electrically connected to a computer for communication;
[0011] The marking graphic is used to identify the information of the target plate, the information of the target plate includes the size and number of the target plate, and the marking graphic is a geometric figure.
[0012] Optionally, the target and the marking graphics are made of retroreflective materials.
[0013] Optionally, the marking pattern is a plurality of rectangular patterns distributed at intervals, and different sizes of the rectangular patterns and / or the intervals between the rectangular patterns represent information of different target plates.
[0014] Optionally, the deformation monitoring device further includes a plurality of infrared light sources surrounding the camera lens, and the infrared light sources are used to irradiate the target plate.
[0015] Optionally, the infrared light source is a vertical cavity surface emitting laser, the infrared light emitted by the vertical cavity surface emitting laser is irradiated on the target plate, the wavelength of the laser emitted by the vertical cavity surface emitting laser is a preset wavelength, and the difference between the maximum and minimum values of the preset wavelength is less than or equal to 40nm.
[0016] Optionally, the preset wavelength is 780-820nm.
[0017] Optionally, the deformation monitoring device further includes a filter, wherein the filter is mounted on the lens of the camera and covers the lens of the camera, and the filter is used to allow infrared light of a preset wavelength to pass through.
[0018] Optionally, the deformation monitoring device further comprises a black infrared-transmitting acrylic plate, and the black infrared-transmitting acrylic plate cover is arranged on the surface of the target plate.
[0019] In summary, this application includes the following beneficial technical effects:
[0020] In this application, after the target plate, camera and computer are installed, the deformation monitoring device needs to be calibrated in the early stage, that is, the size and number of the target plate and the distance between the camera and the target plate need to be configured. In this application, the target plate is photographed by a camera, and the mark graphics on the target plate are obtained and sent to the computer. The computer can analyze the mark graphics and quickly obtain the size and number of the current target plate according to the preset recognition rules, eliminating the manual input operation.
[0021] The present application uses geometric figures to identify the target plate, rather than directly using numbers to represent the size and number. Since there are also numbers in the surrounding environment of the target plate, the numbers in the environment will also be captured by the camera, and the environmental numbers will interfere with the recognition of the numbers on the target plate, affecting the recognition results. The present application identifies the information of the target plate based on the method of geometric figures. Regular geometric figures almost do not exist in the natural environment. This can avoid the interference of the surrounding environment on the recognition results during the process of identifying the target plate information, thereby improving the recognition accuracy.
[0022] The present application utilizes a vertical cavity surface emitting laser to illuminate the target plate. Compared with the use of ordinary infrared light sources, the vertical cavity surface emitting laser used in the present application has better collimation and monochromaticity, and a single wavelength. It can accurately irradiate infrared light onto the target plate, thereby increasing the intensity of infrared reflected light within the target plate range and improving the clarity of the target plate image taken by the camera.
[0023] The black infrared-transmitting acrylic plate makes the target plate invisible to the naked eye, but it can transmit infrared light and does not affect the camera's infrared photography of the target plate. It protects the target plate and prevents the exposed target plate from arousing the curiosity of irrelevant personnel and causing the target plate to be moved artificially. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0025] Figure 1 This is a schematic diagram of the overall structure of the deformation monitoring device of this application;
[0026] Figure 2 This is a schematic diagram of the structure of the camera and vertical cavity surface emitting laser of this application;
[0027] Figure 3 This is a schematic diagram of the structure of the target plate of this application.
[0028] Explanation of the reference numerals: 1. target plate; 11. target point; 12. logo graphic; 2. camera; 21. vertical cavity surface emitting laser; 22. filter; 3. black infrared-transmitting acrylic plate; 4. computer. DETAILED DESCRIPTION
[0029] The embodiments of the present application are described in detail below with reference to the accompanying drawings.
[0030] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.
[0031] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.
[0032] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.
[0033] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.
[0034] An embodiment of the present application provides a deformation monitoring device.
[0035] like Figures 1 to 3 As shown, a deformation monitoring device includes: a target, a camera 2 and a computer 4;
[0036] The target plate 1 is fixed on the monitored object, and a target point 11 and a mark pattern 12 are provided on the target plate 1. The camera 2 is installed in front of the target plate 1 at a preset distance, and the lens of the camera 2 is aimed at the target plate 1. The camera 2 is used to collect image information of the target plate 1. The camera 2 and the computer 4 are electrically connected for communication; wherein, the mark pattern 12 is used to identify the information of the target plate 1, and the information of the target plate 1 includes the size and number of the target plate 1, and the mark pattern 12 is a geometric figure. In this embodiment, the distance between the camera and the target plate is 400 meters.
[0037] After the target plate 1, camera 2 and computer 4 are installed, the deformation monitoring device needs to be calibrated in the early stage, that is, the size and number of the target plate 1 and the distance between the camera 2 and the target plate 1 need to be configured. In this application, the target plate 1 is photographed by the camera 2, and the mark graphic 12 on the target plate 1 is obtained and sent to the computer 4. The computer 4 can analyze the mark graphic 12 and quickly obtain the size and number of the current target plate 1 according to the preset recognition rules, eliminating the manual input operation.
[0038] The present application uses geometric figures to identify the target plate 1 instead of directly using numbers to represent the size and number. This is because there are also numbers in the surrounding environment of the target plate 1, and the numbers in the environment will also be captured by the camera 2. The environmental numbers will interfere with the recognition of the numbers on the target plate 1 and affect the recognition result. The present application identifies the information of the target plate 1 based on geometric figures, and regular geometric figures are almost non-existent in the surrounding environment. This can avoid the interference of the surrounding environment on the recognition result during the process of identifying the information of the target plate 1, thereby improving the recognition accuracy.
[0039] The marking pattern 12 is a plurality of rectangular patterns distributed at intervals, and the different sizes of the rectangular patterns and / or the spacing between the rectangular patterns represent different information of the target plate 1. The marking pattern 12 of the present application is similar to a one-dimensional code. The common one-dimensional code is arranged in a column. The various rectangular patterns of the present application can be distributed in columns or rows, or can be distributed around the target point 11. The specific designer can decide according to the needs. The rectangular pattern can be a rectangular bar or a rectangular block.
[0040] In the embodiment of the present application, the camera 2 is a programmable industrial camera 2, and the camera 2 and the computer 4 are electrically connected via a cable for communication.
[0041] The target point 11 and the mark pattern 12 are retro-reflective materials. The deformation monitoring device also includes a plurality of infrared light sources surrounding the camera 2 lens, the infrared light sources are used to illuminate the target plate 1, and are used to illuminate the target plate 1 at night, so that the target point 11 and the mark pattern 12 can also emit infrared reflected light at night, so that the camera 2 can take clearer pictures of the target plate 1 at night.
[0042] The infrared light source is a vertical cavity surface emitting laser 21, and the infrared light emitted by the vertical cavity surface emitting laser 21 irradiates the target plate 1. The wavelength of the laser emitted by the vertical cavity surface emitting laser 21 is a preset wavelength, and the difference between the maximum value and the minimum value of the preset wavelength is less than or equal to 40nm. The preset wavelength is 780-820nm.
[0043] Since the distance between the camera 2 and the target plate 1 is relatively far, when an ordinary infrared light source is used to illuminate the target plate 1 at the position of the camera 2, the infrared light will diffuse, resulting in insufficient light intensity covering the target plate 1, and weak infrared reflected light from the target plate 1, which affects the clarity of the image taken by the camera 2. The present application uses a vertical cavity surface emitting laser 21 to illuminate the target plate 1. Compared with using an ordinary infrared light source, the vertical cavity surface emitting laser 21 has better collimation and monochromaticity, a single wavelength, and can accurately irradiate the infrared light on the target plate 1, thereby increasing the intensity of infrared reflected light within the range of the target plate 1 and improving the clarity of the image of the target plate 1 taken by the camera 2.
[0044] The deformation monitoring device further includes a filter 22, which is mounted on the lens of the camera 2 and covers the lens of the camera 2. The filter 22 is used to allow infrared light of a preset wavelength to pass through without affecting the infrared light emitted by the vertical cavity surface emitting laser 21 to irradiate the target plate 1 and the camera to shoot the target plate 1. Avoid strong sunlight from irradiating the lens of the camera 2 in the morning and afternoon, which may affect the camera 2 shooting the target plate 1.
[0045] The deformation monitoring device also includes a black infrared-transmitting acrylic plate 3, which is covered on the surface of the target plate 1. The black infrared-transmitting acrylic plate 3 of the present application is a black or dark red material with acrylic as the base material. The characteristic of this material is that it provides black vision in the visible light range, and the visible light transmittance of 400-700nm is less than 1%, but it can transmit the near-infrared region with a wavelength of more than 720-1100nm. The infrared transmittance can range from 80% to 93% according to the thickness of the component, the working band and the color requirements. The black infrared-transmitting acrylic covers the target plate 1. The black infrared-transmitting acrylic plate 3 makes it impossible for the naked eye to see the target plate 1, but it can transmit infrared light, and does not affect the infrared photography of the target plate 1 by the camera 2, and plays a protective role on the target plate 1, so as to prevent the exposed target plate 1 from arousing the curiosity of irrelevant personnel and causing the target plate 1 to be moved artificially.
[0046] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.
Claims
1. A deformation monitoring device, characterized in that: include: Target board (1), camera (2) and computer (4); The target plate (1) is fixed on the monitored object, a target point (11) and a mark pattern (12) are provided on the target plate (1), the camera (2) is installed in front of the target plate (1) at a preset distance, and the lens of the camera (2) is aimed at the target plate (1), the camera (2) is used to collect image information of the target plate (1), and the camera (2) and the computer (4) are electrically connected to communicate; The marking graphic (12) is used to identify the information of the target plate (1), the information of the target plate (1) includes the size and number of the target plate (1), and the marking graphic (12) is a geometric figure.
2. The deformation monitoring device according to claim 1, characterized in that: The target point (11) and the marking pattern (12) are made of retroreflective materials.
3. The deformation monitoring device according to claim 1, characterized in that: The marking pattern (12) is a plurality of rectangular patterns distributed at intervals, and different sizes of the rectangular patterns and / or the intervals between the rectangular patterns represent information of different target plates (1).
4. The deformation monitoring device according to claim 1, characterized in that: The deformation monitoring device also includes a plurality of infrared light sources surrounding the camera (2) lens, and the infrared light sources are used to irradiate the target plate (1).
5. The deformation monitoring device according to claim 4, characterized in that: The infrared light source is a vertical cavity surface emitting laser (21), the infrared light emitted by the vertical cavity surface emitting laser (21) irradiates the target plate (1), the wavelength of the laser emitted by the vertical cavity surface emitting laser (21) is a preset wavelength, and the difference between the maximum value and the minimum value of the preset wavelength is less than or equal to 40 nm.
6. The deformation monitoring device according to claim 5, characterized in that: The preset wavelength is 780-820nm.
7. The deformation monitoring device according to claim 1, characterized in that: The deformation monitoring device also includes a filter (22), which is mounted on the lens of the camera (2) and covers the lens of the camera (2). The filter (22) is used to allow infrared light of a preset wavelength to pass through.
8. The deformation monitoring device according to claim 1, characterized in that: The deformation monitoring device also includes a black infrared-transmitting acrylic plate (3), and the black infrared-transmitting acrylic plate (3) is covered on the surface of the target plate (1).