Passive target device based on image dynamic displacement monitoring

Abstract

The utility model provides a passive target device based on image dynamic displacement monitoring, which relates to the technical field of mechanical measurement and comprises a target and a laser ranging sensor arranged at a long-distance fixed fulcrum of the target. The target is provided with identification lines; the sensing end of the laser distance measuring sensor is arranged aiming at the target; the laser distance measuring sensor can scan, record and identify lines; the laser distance measuring sensor can position the position of the target through recorded identification lines. The passive target device based on image dynamic displacement monitoring provided by the utility model solves the problem of high maintenance cost of a bridge monitoring target in the prior art, and can reduce the maintenance cost of the target.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical measurement, in particular to a passive target device based on image dynamic displacement monitoring. Background Art

[0002] During the operation of the bridge, monitoring equipment is needed to monitor the bridge in real time. When the bridge structure deforms, the monitoring equipment will monitor and capture these deformation signals in real time. When the deformation exceeds the deformation range of normal operation of the bridge, the monitoring equipment will upload the signal and sound an alarm.

[0003] Common monitoring equipment includes targets and depth cameras:

[0004] A plurality of targets are fixed on the surface of the bridge (such as the bottom), and a depth camera is set at a position close to the bridge (such as under the bridge) to monitor the targets;

[0005] The depth camera first needs to identify the target;

[0006] In order to ensure that the depth camera can monitor the target normally at night or in foggy days, which may affect the depth camera's monitoring, LED and LD lights are usually fixed on the target, making the target easier to be detected by the depth camera under low visibility conditions. However, in order for the LED and LD lights to work normally, these targets need to be powered on; and the wiring layout and maintenance require a lot of time for the staff.

[0007] In the prior art, for example, a remote displacement measurement device based on a passive target disclosed in Chinese patent application No. 201920441904.6 uses a passive device as a target, specifically a component that can reflect light as a target, so that a light source installed in a conveniently connected circuit can illuminate a target that is inconvenient to install, making the target conspicuous when visibility is low. This eliminates the need to connect circuits and set light strips on the target, greatly reducing the maintenance cost of the target.

[0008] However, its target does not require no maintenance at all just because there is no power generation equipment. Since the target is illuminated by a light source, and the light source illuminates a range, the target itself does not emit light. Therefore, in the process of locating the target, it is necessary to first identify the target. If the target is identified by its external shape, the external shape of the target may be changed by erosion by wind and rain, or by accumulation of sand and dust, and the reflective parts of the target may be easily blocked and cannot be normally identified by the depth camera. Utility Model Content

[0009] In view of the above technical problems, the passive target device based on image dynamic displacement monitoring provided by the utility model can reduce the maintenance cost of the target.

[0010] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0011] The utility model provides a passive target device based on image dynamic displacement monitoring, comprising a target and a laser ranging sensor arranged at a long-distance fixed fulcrum of the target; the target is provided with identification patterns; the sensing end of the laser ranging sensor is aimed at the target; the laser ranging sensor can scan and record the identification patterns; the laser ranging sensor can locate the target position through the recorded identification patterns.

[0012] The passive target device based on image dynamic displacement monitoring provided by the utility model preferably further comprises a monitoring module; the monitoring module is electrically connected to the laser ranging sensor; the monitoring module can perform data conversion on the signal obtained by the laser ranging sensor and compare it with a preset value.

[0013] The passive target device based on image dynamic displacement monitoring provided by the utility model preferably further comprises a remote communication module capable of uploading signals to a network; the remote communication module is electrically connected to the monitoring module.

[0014] In the passive target device based on image dynamic displacement monitoring provided by the utility model, preferably, the remote communication module is a GPRS system, a wireless network transmission system or a wired transmission system.

[0015] The above technical solution has the following advantages or beneficial effects:

[0016] The utility model provides a passive target device based on image dynamic displacement monitoring, which relates to the field of mechanical measurement technology, including a target and a laser ranging sensor arranged at a long-distance fixed fulcrum of the target; the target is provided with identification lines; the sensing end of the laser ranging sensor is aimed at the target; the laser ranging sensor can scan and record the identification lines; the laser ranging sensor can locate the target position through the recorded identification lines. The passive target device based on image dynamic displacement monitoring provided by the utility model solves the problem of high target maintenance cost of bridge monitoring in the prior art, and the utility model can reduce the target maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention and its features, appearance and advantages will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings. The same reference numerals indicate the same parts in all the drawings. The drawings are not drawn to scale, but the emphasis is on illustrating the subject matter of the present invention.

[0018] Figure 1It is a schematic diagram of the positional relationship between the target and the laser ranging sensor of the passive target device based on image dynamic displacement monitoring provided in Example 1 of the utility model.

[0019] Figure 2 It is a circuit connection wireframe schematic diagram of various structures of the passive target device based on image dynamic displacement monitoring provided in Example 1 of the utility model. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. It should be noted that the terms used in the present invention are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application.

[0021] It should be understood that when the terms “include” and / or “comprise” are used in this specification, they specify the presence of features, steps, operations, devices, components and / or their combinations.

[0022] If the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0023] The terms “first”, “second” and “third” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0024] Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0025] The technical solutions in the embodiments of the present invention are described below in conjunction with the drawings in the embodiments of the present invention. It is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the protection scope of the present invention.

[0026] Embodiment 1:

[0027] When monitoring a bridge, it is necessary to set a target at the bottom of the bridge, use a ranging camera to monitor the distance between the target and the camera, and determine the state of the bridge based on the displacement of the target. To ensure that the target can be identified in low visibility, the target will have its own light source, and a target with a light source means that staff are required to lay circuits for the target. When the light source fails, staff are required to promptly repair the light source on the target to ensure that the target can be identified normally, which results in a very high maintenance cost for the target. In the prior art, there is a method of using a light source that is convenient for laying a position to illuminate a target with a reflective effect to reduce the difficulty of laying circuits, and by removing the electrical energy required for the target, the cost of laying circuits and subsequent maintenance of the target is reduced. However, the target will still be affected by the natural environment, causing changes in the target's external structure. At this time, staff are still required to maintain the target. The passive target device based on image dynamic displacement monitoring provided in Example 1 of the utility model, such as Figures 1 to 2 As shown, it includes a target 1 and a laser ranging sensor 2 arranged at a fixed fulcrum at a long distance of the target; the target 1 is provided with identification lines; the sensing end of the laser ranging sensor 2 is aimed at the target 1; the laser ranging sensor 2 can scan and record the identification lines; the laser ranging sensor 2 can locate the position of the target 1 through the recorded identification lines.

[0028] When the passive target device based on image dynamic displacement monitoring provided by Example 1 of the utility model is working (this example is illustrated for the bottom point of the bridge where the target is difficult to maintain), the staff only needs to install the target to the bottom of the bridge during the initial target installation, and there is no need to maintain the target afterwards; because the laser ranging sensor 2 can pre-identify the identification pattern on the target 1 and locate the target 1; when the laser ranging sensor 2 cannot normally identify the identification pattern, the staff can go to the site to confirm that there is no problem with the bridge, and then let the laser ranging sensor 2 record the identification pattern with a changed shape again, and locate the target 1 with the identification pattern with a changed shape, thereby avoiding the staff from maintaining the target 1 set at a difficult-to-reach location, thereby reducing the maintenance cost of the target. In this embodiment, it is not even necessary to lay a specific target 1 in the initial stage, but the bottom surface of the bridge can be directly used as the target 1; the specific method is: using a laser ranging sensor 2 to scan and record an area at the bottom of the bridge. For the current high-precision laser ranging sensor 2, the surface of the bottom of the bridge is uneven, and there will be a slight difference in the distance between all points in this area and the laser ranging sensor. This slight difference allows the laser ranging sensor to continuously identify this area after scanning this area. A small area A is intercepted from this area as the identification pattern of the target 1, and the surface of the bridge is directly used as the target 1. The position of the identification pattern is deduced and located through the large area of ​​the bridge surface (since the shape and structure changes of the bottom of the bridge will not be synchronously deformed all at once, the position of the identification pattern can be located according to the real-time updated bridge surface shape, thereby locating the bridge). This method can further reduce the maintenance cost of the target (because even if the target falls off, there is no need to reinstall a new target).

[0029] The passive target device based on image dynamic displacement monitoring provided in Example 1 of the utility model solves the problem of high target maintenance cost for bridge monitoring in the prior art. The device proposed in the example of the utility model can reduce the target maintenance cost.

[0030] After the laser ranging sensor 2 identifies the target 1, it is necessary to compare the distance between the target 1 and the laser ranging sensor 2 with the preset distance. Usually, the distance signal is directly uploaded to let the cloud compare this distance with the preset distance range. However, in this embodiment, this preset distance will be adjusted according to each modification of the recognition pattern of the laser ranging sensor 2. Therefore, when the target 1 situation changes, the staff needs to reset the preset distance range in the cloud after resetting the recognition pattern. Since there are many points on the bridge that need to be monitored, it is easy to make mistakes to uniformly modify the displacement distance of a single point in the cloud. To solve this problem, in this embodiment, it also includes a monitoring module 3; the monitoring module 3 is electrically connected to the laser ranging sensor 2; the monitoring module 3 can convert the signal obtained by the laser ranging sensor 2 and compare it with the preset value. After adjusting the laser ranging sensor 2, the staff immediately adjusts the distance range of the monitoring module 3 in time. Timely adjustment can reduce the possibility of error in the displacement range of the bridge point, thereby improving the accuracy of bridge monitoring.

[0031] As a preferred solution, in this embodiment, a remote communication module 4 is also included that can upload signals to the network; the remote communication module 4 is electrically connected to the monitoring module 3. The remote communication module 4 is a GPRS system or a wireless network transmission system or a wired transmission system. The measured distance between the laser ranging sensor 2 and the target 1 and the predetermined distance range are uploaded to the network, which is convenient for remote monitoring of the bridge.

[0032] In summary, the utility model provides a passive target device based on image dynamic displacement monitoring, which relates to the field of mechanical measurement technology, including a target and a laser ranging sensor arranged at a remote fixed fulcrum of the target; the target is provided with identification lines; the sensing end of the laser ranging sensor is aimed at the target; the laser ranging sensor can scan and record the identification lines; the laser ranging sensor can locate the target position through the recorded identification lines. The passive target device based on image dynamic displacement monitoring provided by the utility model solves the problem of high target maintenance cost of bridge monitoring in the prior art, and the utility model can reduce the target maintenance cost.

[0033] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, is also included in the patent protection scope of the present invention.

Claims

1. A passive target device based on image dynamic displacement monitoring, characterized in that: It includes a target and a laser ranging sensor arranged at a long-distance fixed fulcrum of the target; The target is provided with identification patterns; The sensing end of the laser ranging sensor is aimed at the target; The laser distance measuring sensor can scan and record the identification pattern; the laser distance measuring sensor can locate the target position through the recorded identification pattern.

2. The passive target device based on image dynamic displacement monitoring as claimed in claim 1, characterized in that: It also includes a monitoring module; the monitoring module is electrically connected to the laser ranging sensor; The monitoring module can perform data conversion on the signal obtained by the laser ranging sensor and compare it with a preset value.

3. The passive target device based on image dynamic displacement monitoring as claimed in claim 2, characterized in that: It also includes a remote communication module that can upload signals to the network; the remote communication module is electrically connected to the monitoring module.

4. The passive target device based on image dynamic displacement monitoring as claimed in claim 3, characterized in that: The remote communication module is a GPRS system, a wireless network transmission system or a wired transmission system.

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