Devices and systems for long-distance measurement of bridge displacement

Abstract

This invention proposes a device and system for long-distance measurement of bridge displacement. The device includes: an infrared optical marker mounted on a housing, an image acquisition module, a high-brightness light source, and a video display module. The image acquisition module is located at the front end of the video display module. The high-brightness light source is located on the side of the infrared optical marker, with its emission angle being smaller than that of the infrared optical marker. This invention, through the synergy of the infrared optical marker, image acquisition module, high-brightness light source, and video display module, enables the rapid and efficient deployment of multiple infrared optical markers (Ba) over long distances in complex multi-measurement-point environments. It allows for independent deployment without reliance on a visual measurement station (V), reducing the need for multiple adjustments between the deployment personnel and the visual measurement station personnel, lowering the professional requirements for deployment and on-site data acquisition personnel, and improving deployment efficiency and measurement accuracy.

Description

Technical Field

[0001] This utility model relates to the field of building inspection, and in particular to a device and system for long-distance measurement of bridge displacement. Background Technology

[0002] Current vision-based deformation measurement technologies focus on the visual acquisition end and are widely used in short-distance, small-scale measurement scenarios. They rely on optical markers as targets, especially when the visual acquisition end is close to the target being measured. Operators can manually adjust the optical markers based on their characteristics and orientation to easily achieve their orientation and obtain effective deformation measurement data. Furthermore, deformation measurement can also be achieved using non-target imaging features (such as regional imaging of structural surfaces) through image matching algorithms, without the need to deploy active or passive target points on the structure.

[0003] However, with the increasing scale of modern buildings and infrastructure, the application of target setting in traditional visual deformation measurement in ultra-long-distance environments has been greatly limited. Especially for large-span, extra-large bridges, the distance from the visual measurement station to the target can reach hundreds of meters or even further, posing significant challenges to traditional techniques:

[0004] Significant limitations of structural surface image features in long-distance applications: Over large structures, it is nearly impossible to simultaneously monitor multiple widely distributed target points using structural surface features combined with matching algorithms. Visual acquisition stations equipped with medium-to-long telephoto lenses typically lack sufficient resolution, and even with ultra-telephoto lenses, they only cover a very small area. Using multiple visual stations equipped with ultra-telephoto lenses to cover multiple measurement points is not only costly but also results in an exceptionally complex and fragile system architecture. Furthermore, various matching algorithms essentially match image regions, and these algorithms are highly sensitive to changes in ambient light and temperature variations in the air, rendering them impractical for long-distance, large-scale, multi-target simultaneous measurement scenarios. Utility Model Content

[0005] Based on the above problems, this utility model, through the synergy of infrared optical markers, image acquisition modules, high-brightness light lamps, and video display modules, enables the rapid and efficient deployment of multiple infrared optical markers over long distances in complex multi-measurement environments. It can also be deployed independently without dependence on visual measurement stations, reducing the need for multiple adjustments between target deployment personnel and visual measurement station personnel, lowering the professional requirements for deployment personnel and on-site data acquisition personnel, and improving deployment efficiency and measurement accuracy.

[0006] This utility model proposes a device for long-distance measurement of bridge displacement, comprising:

[0007] Infrared optical markers, image acquisition modules, high-brightness LEDs, and video display modules are mounted on the housing;

[0008] The image acquisition module is located in front of the video display module; the high-brightness light is located on the side of the infrared optical marker, and the light emission angle of the high-brightness light is smaller than that of the infrared optical marker.

[0009] Furthermore, the infrared optical marker is a high-power infrared LED optical marker.

[0010] In addition, the high-brightness light is a green high-brightness LED.

[0011] Furthermore, the luminous angle of the high-brightness light is smaller than that of the infrared optical marker:

[0012] The optical axis of the high-brightness light is parallel to the optical axis of the infrared optical marker.

[0013] This utility model also proposes a system for measuring bridge displacement over a long distance, comprising: multiple devices for measuring bridge displacement over a long distance, respectively set at the position of measuring points on the bridge body of the bridge being measured, and an optical lens set at a visual measuring station at a preset distance from the bridge being measured.

[0014] Devices for long-distance measurement of bridge displacement include:

[0015] Infrared optical markers, image acquisition modules, high-brightness LEDs, and video display modules are mounted on the housing;

[0016] The image acquisition module is located in front of the video display module; the high-brightness light is located on the side of the infrared optical marker, and the light emission angle of the high-brightness light is smaller than that of the infrared optical marker.

[0017] In addition, two measuring points were set at the top of the arch of the bridge being measured, and the visual measuring station used the optical lens with the longest focal length to observe these two measuring points.

[0018] In addition, there are 14 measuring points on the bridge being tested, which are set up on average on the bridge.

[0019] In addition, the location of the measuring point is selected based on the load test, and the location of the visual measuring station is selected based on visual deformation measurement.

[0020] In addition, the system includes three working modes: aiming mode, data acquisition mode, and standby mode;

[0021] In aiming mode, the high-brightness LED flashes periodically.

[0022] In addition, in the data acquisition mode, both the high-brightness light and the infrared optical marker are constantly lit.

[0023] This invention, through the synergy of infrared optical markers, an image acquisition module, a high-brightness light source, and a video display module, enables the rapid and efficient deployment of multiple infrared optical markers over long distances in complex multi-measurement environments. It also allows for independent deployment without dependence on visual measurement stations, reducing the need for multiple adjustments between the target deployment personnel and the visual measurement station personnel, lowering the professional requirements for deployment personnel and on-site data acquisition personnel, and improving deployment efficiency and measurement accuracy. Attached Figure Description

[0024] Figure 1 A schematic diagram of a device for long-distance measurement of bridge displacement provided in one embodiment of this utility model;

[0025] Figure 2 A side view showing the site layout of a system for long-distance measurement of bridge displacement provided in one embodiment of this utility model;

[0026] Figure 3 A top view showing the site layout of a system for long-distance bridge displacement measurement according to an embodiment of this utility model. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to specific embodiments and accompanying drawings. This description is intended only to illustrate the specific embodiments of the present invention and does not constitute any limitation on the present invention. The scope of protection of the present invention is defined by the claims.

[0028] Reference Figure 1 This utility model proposes a device for long-distance measurement of bridge displacement, comprising:

[0029] The infrared optical marker Ba, the image acquisition module Bb, the high-brightness light Bc, and the video display module Bd are set on the housing;

[0030] The image acquisition module Bb is located in front of the video display module Bd; the high-brightness light Bc is located on the side of the infrared optical marker Ba, and the light emission angle of the high-brightness light Bc is smaller than that of the infrared optical marker Ba.

[0031] The limitations of existing technologies using single infrared light source markers: When measuring large bridges over long distances, installing active markers under such conditions has become the most practical solution. Infrared LEDs can achieve the best signal-to-noise ratio in conjunction with optical systems. However, this approach faces numerous challenges in actual deployment of measurement points. First, the field measurement and installation environment is harsh, especially in complex structures such as large bridges, where installation locations are often situated at extremely high and dangerous levels. Second, to improve data accuracy, visual acquisition stations often use telephoto lenses to enhance the resolution of deformation measurements, but this significantly reduces the field of view, making it difficult to quickly cover a wide area. Especially at distances of several hundred meters or more, repetitive features in the bridge structure increase the difficulty of positioning, making it even difficult to quickly locate the current installation personnel using video previews from the visual measurement station. Furthermore, to increase the effective illumination distance while maintaining a reasonable battery size, infrared optical markers are usually fitted with lenses to increase illumination intensity, but this also results in an extremely narrow illumination angle, typically designed to be below 15 degrees. Faced with these challenges, personnel at the visual measurement station can only rely on the video preview of the station's visual acquisition device to check the aiming status of the infrared marker. During installation, personnel at the deployment end slowly rotate the marker's aiming direction based on subjective feeling, while waiting for operational prompts from the station personnel via walkie-talkie, such as adjusting the direction and speed. This process requires a high degree of professionalism and close cooperation between the visual measurement station, the remote measurement point deployment end, and related support personnel to ensure accurate target orientation and achieve optimal measurement. However, in practice, the scenario is often as follows: the measurement point deployment personnel have usually arrived at the measurement point and roughly completed the marker installation, but due to the distance of the visual measurement station or obstructions from structures, the visual measurement station often needs to be repeatedly adjusted. Because infrared LEDs are invisible, the visual acquisition device must be turned on each time, and the target must be found through video preview. After finally determining the appropriate visual measurement station position, the installation personnel are then guided through the walkie-talkie. In reality, there are often more unfavorable factors, such as unclear instructions, inconsistent understanding of direction, unfamiliarity of personnel at the visual measurement station, and lack of understanding of the final measurement purpose by the personnel deploying the measurement points. As a result, in most cases, the aiming direction of the marker can only be roughly towards the visual measurement station.

[0032] The problems associated with multi-point, multi-vision measurement stations become even more pronounced: On some super-large bridges spanning rivers and canyons, a single routine static load test for deformation measurement often requires the installation of twenty to thirty or even more markers. To ensure the measurement effect on a large scale, vision measurement stations typically employ a multi-station approach, with each station targeting multiple marker points. This significantly increases the complexity of marker deployment. Inconsistent marker orientation directly affects the adaptability of the vision algorithm, making it difficult for the algorithm to uniformly identify and match all marker points, further exacerbating project complexity and reducing data acquisition quality. Especially when there are large orientation deviations, the imaging characteristics of some marker points differ significantly from other marker points, resulting in large differences in brightness, shape, or position, affecting the automatic correction and data fusion effects of the vision system. Ultimately, this not only increases the difficulty of subsequent data processing but may also lead to the accumulation of measurement errors, thereby reducing overall measurement accuracy and making it difficult to meet the engineering measurement requirements in complex environments.

[0033] In this invention, to ensure that personnel at the visual measuring station V can indirectly determine the orientation of the infrared optical marker Ba based on brightness, a high-brightness light Bc is configured. The function of the high-brightness light Bc is to provide real-time aiming cues through brightness changes. Due to the presence of the high-brightness light Bc, even without activating external visual acquisition equipment, operators at the remote visual measuring station V can quickly locate the flashing light with their naked eyes. Simultaneously, by observing the brightness changes of the high-brightness light Bc, operators at the visual measuring station V can accurately determine the aiming status of the infrared optical marker Ba. Optionally, when the brightness of the high-brightness light Bc reaches its maximum, it indicates that the infrared optical marker Ba is in the optimal aiming state.

[0034] In this invention, the infrared optical marker Ba is used for large-scale, multi-point displacement and deformation observation of remote, multi-visual stations V based on the principle of vision. The image acquisition module Bb works in conjunction with the infrared optical marker Ba. The line of sight of the image acquisition module Bb is aligned with the light emission axis of the infrared optical marker Ba. The video display module Bd has a real-time preview function. The video display module Bd assists in achieving accurate aiming of the visual measurement station V.

[0035] The high-brightness light Bc works in conjunction with the infrared optical marker Ba. The light emission angle of the high-brightness light Bc is configured to be smaller than that of the infrared optical marker Ba, which is used to assist aiming through brightness changes and provide status indication function.

[0036] The image acquisition module Bb is used to acquire the spectral image of the infrared optical marker Ba, and the video display module Bd assists in the long-distance aiming of multiple infrared optical markers Ba. The aiming is completed when the external visual acquisition device of the visual measurement point is in the center of the image display.

[0037] When using the device provided by this utility model, the device provides three working modes: aiming mode, data acquisition mode and standby mode;

[0038] Aiming Mode: In this mode, the high-brightness light Bc flashes periodically, while the infrared optical marker Ba is off. Through the flashing effect of the high-brightness light Bc, personnel at the visual station can quickly locate the infrared optical marker Ba and confirm its orientation. This mode allows operators to operate independently of external visual acquisition devices, quickly pinpointing the bridge's station location and promptly confirming the optimal orientation of the infrared optical marker B.

[0039] Optionally, based on the human eye's sensitivity to green light and flickering, the high-brightness light Bc is a green high-brightness LED.

[0040] Data Acquisition Mode: In this mode, the high-brightness light Bc and the infrared optical marker Ba are both constantly lit. The infrared optical marker Ba is used for deformation measurement, while the high-brightness light Bc assists in real-time monitoring of the working status of the infrared optical marker Ba, ensuring that all measuring points on the bridge are in normal data acquisition status. During daytime deformation measurements at multiple points and multiple visual stations, the display device at visual station V, used to show the current target scene, may be unclear under strong outdoor light conditions. In this case, the high-brightness light Bc, through its intuitive on / off status, allows operators and surrounding support personnel to quickly confirm the working status of the infrared optical marker Ba, promptly identify potential problems, and avoid data quality degradation due to missed measurements, thus preventing increased difficulty in subsequent processing.

[0041] Standby Mode: In standby mode, both the high-brightness LED Bc and the infrared optical marker Ba are inactive to reduce unnecessary power consumption. The on-site environment often lacks a stable power supply, so the system typically uses battery power. The high-brightness LED Bc clearly indicates to the operator that the device is in standby mode, preventing power waste caused by the infrared optical marker Ba not being fully turned off. Without this indication from the high-brightness LED Bc, operators must rely on external visual acquisition equipment to confirm the status of the infrared optical marker Ba. With many measurement points, it's easy to forget to turn off the infrared optical marker Ba, resulting in wasted power. Even using other methods, such as built-in wireless modules or power detection modules, requires an additional human-machine interface to indicate the status, increasing cost and complexity. The high-brightness LED Bc's design is simple and efficient, reducing operational difficulty and extending the actual operating time of the device.

[0042] Collaborative operation: The combination of infrared optical marker Ba, image acquisition module Bb, high-brightness light Bc, and video display module Bd enables the rapid and efficient deployment of multiple infrared optical markers Ba over long distances in complex multi-measurement-point environments. It can also be deployed independently without dependence on the visual measurement station V, reducing the need for multiple adjustments between the target deployment personnel and the visual measurement station V personnel, lowering the professional requirements for deployment personnel and on-site data acquisition personnel, and improving deployment efficiency and measurement accuracy.

[0043] Compared with existing technologies, this utility model has the following advantages and technical features: Improved deployment efficiency: Through the collaborative work of the infrared optical marker Ba and the image acquisition module Bb, combined with the intuitive feedback provided by the high-brightness light Bc, operators can independently complete the orientation of the infrared optical marker Ba, reducing reliance on the visual measuring station V and significantly improving deployment efficiency. Enhanced accuracy and reliability: By optimizing the optical axis design and previewing the video display module Bd, accurate alignment between the infrared optical marker Ba and the visual measuring station V is ensured. The high-brightness light Bc provides real-time feedback, making orientation more intuitive and faster, effectively improving the system's accuracy and reliability. Efficient and simple operation mode: The system has three modes: the aiming mode uses the flashing of the high-brightness light Bc to help with rapid positioning; the data acquisition mode ensures visualization of the measuring point's working status; and the standby mode reduces power consumption, making operation simple and efficient, avoiding reliance on complex equipment. Adaptability to multiple measuring stations and points: Through the cooperation of the high-brightness light Bc and the infrared optical marker Ba, the system achieves precise deployment on complex structures, ensuring synchronous alignment of multiple visual measuring stations V and measuring points, improving flexibility and adaptability. Real-time status monitoring: The high-brightness LED Bc provides clear indications even in strong light, allowing operators to quickly detect anomalies and avoid missing measurement locations. Power saving and extended operating time: Standby mode reduces power consumption, and the high-brightness LED Bc provides clear status indicators, preventing power waste caused by leaving the infrared optical marker Ba on and extending the operating time of battery-powered equipment. Cost-effectiveness and ease of operation: The design of the infrared optical marker Ba reduces reliance on complex human-machine interfaces, eliminating the need for additional wireless modules or power detection modules, lowering system costs, and improving ease of operation.

[0044] In one embodiment, the infrared optical marker is a high-power infrared LED optical marker.

[0045] High-power infrared LED optical markers boast high luminous efficiency and strong radiation power, providing a bright infrared light source to meet long-distance illumination needs. They also feature high-frequency response characteristics, making them suitable for applications requiring rapid reaction. Low power consumption and high energy efficiency help reduce equipment energy consumption and meet environmental protection requirements. Stable performance ensures continuous and reliable infrared light output in various environments. High-power infrared LED optical markers offer strong night vision capabilities, providing supplemental lighting for night vision equipment and enhancing visual perception in dark environments. They are resistant to various interferences and noises, adapting to complex environments and ensuring stable equipment operation. The emitted infrared light is invisible to the human eye, making them suitable for applications requiring concealment.

[0046] In one embodiment, the high-brightness light is a green high-brightness LED.

[0047] Based on the human eye's sensitivity to green light and flickering, the high-brightness light Bc is a green high-brightness LED. The green high-brightness LED provides real-time feedback, making orientation more intuitive and faster. At the same time, the green high-brightness LED setting can also prevent operators from misreading the infrared optical marker Ba, and it also facilitates the location and retrieval of the infrared optical marker Ba when data is collected at night and at the end of the collection.

[0048] In one embodiment, the emission angle of the configured high-brightness light is smaller than the emission angle of the infrared optical marker by:

[0049] The optical axis of the high-brightness light is parallel to the optical axis of the infrared optical marker. By making their optical axes parallel, the high-brightness light provides real-time aiming guidance through changes in brightness. In actual manufacturing and assembly processes, due to potential errors, it is necessary to ensure that the angle between their optical axes is less than 0.1 degrees.

[0050] Reference Figure 2-3 This utility model also proposes a system for measuring bridge displacement over a long distance, comprising: multiple devices for measuring bridge displacement over a long distance, respectively set at the position of measuring points on the bridge body of the bridge being measured, and an optical lens set at a visual measuring station V at a preset distance from the bridge being measured.

[0051] Devices for long-distance measurement of bridge displacement include:

[0052] The infrared optical marker Ba, the image acquisition module Bb, the high-brightness light Bc, and the video display module Bd are set on the housing;

[0053] The image acquisition module Bb is located in front of the video display module Bd; the high-brightness light Bc is located on the side of the infrared optical marker Ba, and the light emission angle of the high-brightness light Bc is smaller than that of the infrared optical marker Ba.

[0054] Among them, V1-V5 are various visual measurement stations, B1-B14 are measurement points on the bridge body, and AR is a large steel pipe arch structure.

[0055] Optionally, two measuring points are set at the arch of the bridge being measured, and the visual measuring station uses the optical lens with the longest focal length to observe these two measuring points.

[0056] Optionally, the bridge under test contains 14 measuring points, which are evenly distributed across the bridge.

[0057] Optionally, the infrared optical marker is a high-power infrared LED optical marker.

[0058] Optionally, the high-brightness light is a green high-brightness LED.

[0059] Optionally, the light emission angle of the high-brightness light lamp is smaller than that of the infrared optical marker, wherein the optical axis of the high-brightness light lamp is parallel to the optical axis of the infrared optical marker.

[0060] like Figure 2 As shown, a mechanical load test was conducted on a super-large steel pipe arch bridge spanning a river. The entire arch ring has a designed length of 450 meters and a designed height of 100 meters. During the load loading process, deformation measurements were taken at various key points. For the implementation of vision-based deformation measurement technology, combined with the on-site test conditions, to ensure that load tests could be conducted both day and night, and based on the theoretical and empirical deformation values ​​of each measuring point, and to achieve the desired resolution and accuracy in the final measurement, we designed the following... Figure 2 The diagram shows the on-site deployment plan for visual deformation measurement. The locations of measurement points B1 to B14 are based on the load test plan, while the locations of visual measurement stations V1 to V5 are determined based on the preliminary determination of the selected location area for visual deformation measurement.

[0061] To ensure measurement accuracy at the most critical arch, we established the location of visual station V1 on the south bank. We used the longest focal length lens from this deformation measurement load test, with its field of view covering only two target points, B7 and B8. This was based on the principle that optical resolution is always crucial to accuracy in various vision-based deformation measurements. For the remaining measurement points on both sides, following the same principle, we selected appropriate lens focal lengths to plan the location range of the remaining visual stations while ensuring theoretical resolution and accuracy.

[0062] Next, relevant personnel arrived at the site to begin the specific implementation. Given that the area of ​​the measurement station had already been preliminarily determined, the personnel at the visual measurement station first arrived at the area of ​​the pre-set visual measurement stations V1, V2, and V3 on the south bank to begin preparations. A visual measurement station was set up on-site, and a video preview was activated. The purpose of activating the preview was to further and accurately confirm the planned location of the visual measurement station. This was done by ensuring that the structural parts where the infrared optical marker Ba would be installed were visible in the video preview, with particular attention paid to the furthest points, namely the structural parts where B7 and B8 on the arch would be installed, were displayed in the video preview. Any discrepancies needed to be adjusted promptly. Finally, the station location was finalized, and a tripod or other obvious reference object was erected for the orientation of the infrared optical marker Ba during deployment.

[0063] Meanwhile, the deployment personnel, having prepared for safety precautions, carry the eight infrared optical markers Ba corresponding to measurement points B1 to B8. They proceed sequentially to the measurement points via the climbing ladder on the upper part of the steel pipe arch. Upon reaching the designated measurement point, they communicate with the visual measurement station personnel visually or via walkie-talkie to confirm that the visual measurement station has accurately identified the station location. Then, the infrared optical markers Ba can be installed at the current measurement point's structural location. The image acquisition module Bb (optionally a miniature image acquisition module) and video display module Bd are used to aim at the reference object set up by the visual measurement station. Simultaneously, the high-brightness light Bc can be activated in aiming mode, allowing personnel at the visual measurement station to visually confirm the current orientation of the infrared optical markers Ba without needing to activate the visual measurement station's video preview to confirm the installation direction. If the visual measurement station has not yet determined the precise location, the deployment personnel can first roughly install the infrared optical marker Ba at the corresponding point on the structure of the measured point, and then move to the next measurement point in sequence. After the other points are deployed, the personnel can return and precisely orient the infrared optical marker Ba that was just roughly installed according to the set orientation method.

[0064] Especially for points B7 and B8 on the arch, these two points are located at the farthest and highest points of the arch. The climbing ladder is set at the top of the arch. Due to the large diameter of the arch, the installation and deployment personnel at the current location cannot be seen from the visual measurement station. Moreover, the bridge structure itself has many repetitive features, making it difficult for non-professionals to visually confirm the arch positions of B7 and B8. To ensure that the visual measurement station can see B7 and B8 through the visual measurement equipment, the deployment personnel appropriately install the infrared optical marker Ba on the outside of the arch, turn on the aiming mode, and when the high-brightness light Bc is flashing, the personnel at the visual measurement station can quickly locate the current installation position in the simplest and most intuitive way, without needing any professional knowledge of the bridge structure. Next, the deployment personnel can also use the set image acquisition module Bb, in conjunction with the personnel at the visual measurement station, to accurately orient the infrared optical marker Ba by observing the brightness of the flashing high-brightness light Bc, ultimately completing the precise orientation of B7 and B8. The orientation direction and its graphical description in the field of view of the visual measurement equipment are shown in the figure. Following the same steps and methods, the deployment of targets B9 to B14 on the north bank side was then completed. At this point, the infrared optical markers Ba for all target points requiring measurement within the current arch were precisely oriented at locations B1 to B14.

[0065] After all the infrared optical markers Ba have been precisely oriented and installed, during the waiting period before the deformation measurements at each stage of the formal load test, the standby mode described by the device can be used. It is very simple to confirm that all the infrared optical markers Ba are in standby mode as long as no infrared optical marker Ba on the arch structure is seen to be flashing or constantly lit.

[0066] According to the load deformation measurement test plan, this test involves four working conditions for arch deformation measurement. Each working condition requires deformation measurement at six points: from the initial position after the bridge deck is cleared, to the deformation measurement after the graded loading vehicles reach the designated positions on the bridge deck and stabilize, and finally to the residual value measurement after all loads are removed from the bridge. The entire arch deformation measurement across the four working conditions is expected to take 5 hours. Precise control of power consumption is crucial during this process. After each graded loading vehicle position is ready and stable for a period of time, according to the data acquisition mode described by the device, all infrared optical markers Ba (infrared optical markers Ba at each measuring point B1-B14) are activated. The working status of the infrared optical markers Ba can be confirmed by the constant illumination of each set high-brightness light Bc. After all markers are activated without omission, deformation data for this stage is collected. After collection, all infrared optical markers Ba are switched to standby mode to save power. This process is repeated until deformation data for all working conditions is collected.

[0067] This invention, through the synergy of infrared optical markers, an image acquisition module, a high-brightness light source, and a video display module, enables the rapid and efficient deployment of multiple infrared optical markers (Ba) over long distances in complex multi-measurement environments. Furthermore, it allows for independent deployment without relying on a visual measurement station (V), reducing the need for multiple adjustments between the deployment personnel and the visual measurement station personnel, lowering the professional requirements for both deployment and on-site data acquisition personnel, and improving deployment efficiency and measurement accuracy.

[0068] In one embodiment, two measuring points are set at the arch of the bridge under test, and the visual measuring station uses the optical lens with the longest focal length to observe these two measuring points.

[0069] For the two measuring points B7 and B8 on the arch, since these two measuring points are located at the farthest point and the highest point of the arch, it is necessary to use the optical lens with the longest focal length to observe these two measuring points.

[0070] In one embodiment, the bridge under test comprises 14 measuring points, which are evenly distributed across the bridge.

[0071] By setting up multiple measuring points, a comprehensive inspection of the deformation at various points on the bridge was conducted.

[0072] In one embodiment, the location of the measuring point is selected based on a load test, and the location of the visual measuring station is selected based on visual deformation measurement.

[0073] In one embodiment, the system includes three operating modes: aiming mode, data acquisition mode, and standby mode;

[0074] In aiming mode, the high-brightness LED flashes periodically.

[0075] In one embodiment, in the data acquisition mode, both the high-brightness light and the infrared optical marker are constantly lit.

[0076] Data Acquisition Mode: In this mode, the high-brightness light Bc and the infrared optical marker Ba are both constantly lit. The infrared optical marker Ba is used for deformation measurement, while the high-brightness light Bc assists in real-time monitoring of the working status of the infrared optical marker Ba, ensuring that all measuring points on the bridge are in normal data acquisition status. During daytime deformation measurements at multiple points and multiple visual stations, the display device at visual station V, used to show the current target scene, may be unclear under strong outdoor light conditions. In this case, the high-brightness light Bc, through its intuitive on / off status, allows operators and surrounding support personnel to quickly confirm the working status of the infrared optical marker Ba, promptly identify potential problems, and avoid data quality degradation due to missed measurements, thus preventing increased difficulty in subsequent processing.

[0077] Standby Mode: In standby mode, both the high-brightness LED Bc and the infrared optical marker Ba are inactive to reduce unnecessary power consumption. The on-site environment often lacks a stable power supply, so the system typically uses battery power. The high-brightness LED Bc clearly indicates to the operator that the device is in standby mode, preventing power waste caused by the infrared optical marker Ba not being fully turned off. Without this indication from the high-brightness LED Bc, operators must rely on external visual acquisition equipment to confirm the status of the infrared optical marker Ba. With many measurement points, it's easy to forget to turn off the infrared optical marker Ba, resulting in wasted power. Even using other methods, such as built-in wireless modules or power detection modules, requires an additional human-machine interface to indicate the status, increasing cost and complexity. The high-brightness LED Bc's design is simple and efficient, reducing operational difficulty and extending the actual operating time of the device.

[0078] The above description is merely the principle and preferred embodiment of this utility model. It should be noted that, for those skilled in the art, several other modifications can be made based on the principle of this utility model, and these modifications should also be considered within the protection scope of this utility model.

Claims

1. A device for long-distance measurement of bridge displacement, characterized in that, include: Infrared optical markers, image acquisition modules, high-brightness LEDs, and video display modules are mounted on the housing; The image acquisition module is located in front of the video display module; The high-brightness light is set on the side of the infrared optical marker, and the light emission angle of the high-brightness light is smaller than the light emission angle of the infrared optical marker.

2. The device for long-distance measurement of bridge displacement according to claim 1, characterized in that, The infrared optical marker is a high-power infrared LED optical marker.

3. The device for long-distance measurement of bridge displacement according to claim 1, characterized in that, The high-brightness light is a green high-brightness LED.

4. The device for long-distance measurement of bridge displacement according to any one of claims 1-3, characterized in that, The luminous angle of the high-brightness light is smaller than that of the infrared optical marker: The optical axis of the high-brightness light is parallel to the optical axis of the infrared optical marker.

5. A system for long-distance measurement of bridge displacement, characterized in that, include: Multiple devices for measuring bridge displacement over long distances are set at measuring points on the bridge body under test, and optical lenses are set at visual stations at a preset distance from the bridge under test. Devices for long-distance measurement of bridge displacement include: Infrared optical markers, image acquisition modules, high-brightness LEDs, and video display modules are mounted on the housing; The image acquisition module is located in front of the video display module; the high-brightness light is located on the side of the infrared optical marker, and the light emission angle of the high-brightness light is smaller than that of the infrared optical marker.

6. The system for long-distance measurement of bridge displacement according to claim 5, characterized in that, Two measuring points were set at the top of the arch of the bridge being measured, and the visual measuring station used the optical lens with the longest focal length to observe these two measuring points.

7. The system for long-distance measurement of bridge displacement according to claim 5, characterized in that, The bridge under test has a total of 14 measuring points, which are set up on an average of the bridge.

8. The system for long-distance measurement of bridge displacement according to claim 7, characterized in that, The location of the measuring point is selected based on the load test, and the location of the visual measuring station is selected based on visual deformation measurement.

9. The system for long-distance measurement of bridge displacement according to any one of claims 5-8, characterized in that, The system includes three working modes: aiming mode, data acquisition mode, and standby mode; In aiming mode, the high-brightness LED flashes periodically.

10. The system for long-distance measurement of bridge displacement according to claim 9, characterized in that, In the data acquisition mode, both the high-brightness light and the infrared optical marker are constantly lit.

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