Bridge settlement monitoring device

Abstract

The utility model discloses a bridge settlement monitoring device, which comprises an optical unit used for converging and deflecting received laser beams and imaging on a receiving unit to form light spots; the receiving unit is arranged on the imaging side of the optical unit along the light path, and the distance between the receiving unit and the optical unit is larger than two times of the focal length of the optical unit. The optical unit is adopted to converge and deflect laser beams transmitted in a long distance, and images are formed on the receiving unit to form light spots, so that the problem of inaccurate measurement caused by large size of the light spots on the receiving unit due to laser beam divergence in laser long-distance transmission is well solved; and the distance between the receiving unit and the optical unit is set, so that the displacement of the light spot on the receiving unit can be multiplied by the displacement of the laser light source, and the measurement precision of the settlement of the bridge monitoring point is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge monitoring, and in particular relates to a bridge settlement monitoring device. Background Art

[0002] Bridge settlement monitoring plays an important role in ensuring bridge safety. Currently, bridge settlement monitoring usually adopts the laser monitoring method, which measures the deformation of the bridge by monitoring the changes in the laser position. However, since the laser will diverge during long-distance transmission and the deformation of the bridge is often small, it is often difficult to accurately monitor the bridge settlement. Utility Model Content

[0003] The purpose of the utility model is to provide a bridge settlement monitoring device to solve the problem that it is difficult to accurately measure the settlement amount in long-distance bridge settlement monitoring.

[0004] The utility model is achieved through the following technical solutions:

[0005] Bridge settlement monitoring device, including:

[0006] An optical unit, used to converge and deflect the received laser beam and form an image on the receiving unit to form a light spot;

[0007] The receiving unit is arranged on an imaging side of the optical unit along the optical path, and the distance between the receiving unit and the optical unit is greater than twice the focal length of the optical unit.

[0008] In some embodiments, the optical unit is a Fresnel lens.

[0009] In some embodiments, the receiving unit uses a photodetector.

[0010] In some embodiments, a detection unit is further included, and the detection unit is electrically connected to the receiving unit.

[0011] In some embodiments, the receiving unit includes a receiving screen and a camera disposed on one side of the receiving screen, and the camera is used to capture an image of the light spot on the receiving screen.

[0012] In some embodiments, the receiving screen is flat.

[0013] In some embodiments, the receiving screen is a convex spherical surface or a concave spherical surface.

[0014] In some embodiments, the system further includes a detection unit electrically connected to the camera.

[0015] In some embodiments, the system includes a housing, wherein the optical unit and the receiving unit are respectively disposed in the housing.

[0016] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0017] The monitoring device in the utility model adopts optical unit to gather and deflect the laser beam of long-distance transmission, and forms a light spot on the receiving unit, which solves the problem of inaccurate measurement caused by the large size of the light spot on the receiving unit due to the divergence of the laser beam in long-distance laser transmission, and through the spacing between the receiving unit and the optical unit, the displacement of the light spot on the receiving unit can be amplified by multiple times to the displacement of the laser light source, thereby improving the measurement accuracy of the bridge monitoring point settlement. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the drawings in the embodiment will be briefly introduced below, and it should be understood that the following drawings only show some embodiments of the utility model, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 It is a bridge settlement monitoring device measurement principle diagram in the embodiment of the utility model.

[0020] Figure 2 It is a bridge settlement monitoring device structure diagram in an embodiment of the utility model.

[0021] Figure 3 It is a bridge settlement monitoring device structure diagram in another embodiment of the utility model.

[0022] Figure 4 It is a bridge settlement monitoring device structure diagram in another embodiment of the utility model.

[0023] Figure 5 It is a laser emitting device structure diagram in the embodiment of the utility model.

[0024] Among them:

[0025] 10, laser emitting device, 11, laser light source, 12, laser processing unit, 13, mark plate;

[0026] 20, monitoring device, 21, optical unit, 22, receiving unit, 221, photoelectric detector, 222, receiving screen, 223, camera, 23, detection unit, 24, shell. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0028] When using laser to monitor the deformation and settlement of a bridge, a laser light source is usually set at the monitoring point of the bridge. When the monitoring point settles, the laser light source will move with the bridge. At this time, the monitoring device measures the displacement of the light spot formed by the laser light source on its receiving unit, and the amount of settlement at the monitoring point can be obtained, thereby realizing the settlement monitoring of the bridge.

[0029] When using this monitoring method for measurement, the laser beam will diverge during long-distance transmission, resulting in a larger spot size received on the receiving unit of the monitoring device, resulting in inaccurate measurement of the displacement of the spot, affecting the accuracy of the settlement measurement.

[0030] Since the deformation and settlement of bridges and other objects are often small, usually in the millimeter or sub-millimeter level, it is often difficult to accurately measure the displacement of such a small light spot at the receiving end, further affecting the accurate measurement of bridge settlement.

[0031] In response to the above-mentioned problems, some embodiments of the present invention provide a bridge settlement monitoring device. By setting a laser light source at the monitoring point of the bridge, the monitoring device is used to detect the displacement of the laser light source, thereby realizing the displacement of the laser light source at the monitoring point in the settlement direction and monitoring the settlement of the monitoring point.

[0032] Reference Figure 1 and Figure 2 , the bridge settlement monitoring device includes:

[0033] The optical unit 21 is used to converge and deflect the received laser beam and form an image on the receiving unit to form a light spot;

[0034] The receiving unit 22 is provided on one side of the optical unit. The distance between the receiving unit and the optical unit is greater than twice the focal length of the optical unit, so that the displacement of the light spot on the receiving unit can amplify the displacement of the laser beam.

[0035] Monitoring device 20 is positioned opposite monitoring points on the bridge. It receives laser beams emitted by laser sources at each monitoring point and measures the displacement of the laser sources, thereby determining the settlement at each monitoring point. To ensure that the laser beams at each monitoring point are received and imaged on the monitoring device, the monitoring device is typically positioned at a considerable distance from the bridge, for example, 10-100 meters or more, depending on the number of monitoring points to be monitored and the spacing between them.

[0036] In order to measure the settlement and deformation of multiple monitoring points in the longitudinal direction of the bridge, the monitoring device needs to be able to receive and cover the laser beams of multiple laser light sources set up on a larger span at one position, and be able to image the laser light sources on the receiving unit of the monitoring device. Therefore, the monitoring device is usually set at a farther position.

[0037] However, when lasers are transmitted over long distances, the divergence of the laser beam causes the image size on the receiving unit to be large, affecting the measurement of the light spot displacement and, consequently, the accurate measurement of the sedimentation. Here, an optical unit is used to converge the laser beam, reducing the size of the light spot imaged on the receiving unit. This solves the problem of inaccurate measurements caused by the large size of the light spot on the receiving unit due to the divergence of the laser beam during long-distance laser transmission.

[0038] At the same time, by setting the distance between the receiving unit and the optical unit, the displacement of the light spot on the receiving unit can multiply the displacement of the laser light source, thereby improving the measurement accuracy of the settlement of the bridge monitoring point.

[0039] In some embodiments, the optical unit 21 may be a convex lens or a Fresnel lens with similar functions that can focus light. Using a lens with a focusing function to converge and focus the laser beam reduces the size of the laser spot formed by the laser beam and improves the measurement accuracy of the spot displacement.

[0040] In some embodiments, the receiving unit 22 may use a photodetector 221. When the light spot is imaged on the target surface of the photodetector, the photodetector converts the output into an electrical signal. At this time, the current position of the light spot on the target surface can be obtained according to the electrical signal output by the photodetector. By comparing the position of the current light spot and the position of the light spot on the receiving unit when the laser light source is at the initial position, the displacement of the light spot can be calculated.

[0041] The displacement of the light spot is calculated according to the current position of the light spot on the receiving unit and the position of the light spot on the receiving unit when the laser light source is at the initial position, and the settlement amount of the corresponding monitoring point is obtained according to the displacement of the light spot.

[0042] The laser light source's initial position refers to the monitoring point's location before settlement or deformation. After each laser light source is set up on the bridge, the spot position of the laser beam on the receiving unit is measured and stored as initial data. In subsequent settlement monitoring, the current spot position data is compared with the initial data to calculate the spot displacement.

[0043] In some embodiments, the receiving unit 22 may include a receiving screen 222 and a camera 223 , wherein the camera is used to obtain an image of the light spot on the receiving screen; and calculate the position of the light spot on the receiving screen based on the obtained image of the light spot on the receiving screen.

[0044] The receiving screen 222 can be set to a plane, or the receiving screen 222 can be set to a convex spherical surface or a concave spherical surface to increase the receiving area of ​​the receiving screen and increase the detection range of the sedimentation amount.

[0045] In some embodiments, the monitoring device also includes a detection unit 23, which calculates the displacement of the light spot based on the position of the light spot on the current receiving unit and the position of the light spot on the receiving unit when the laser light source is at the initial position, and obtains the settlement amount of the corresponding monitoring point based on the displacement of the light spot.

[0046] When the receiving unit adopts a photodetector, the detection unit is electrically connected to the photodetector, receives the electrical signal output by the photodetector, calculates the current position of the light spot on the target surface, and calculates the displacement of the light spot by comparing the current position of the light spot with the position of the light spot on the receiving unit when the laser light source is at the initial position.

[0047] When the receiving unit uses a receiving screen and a camera, the detection unit is electrically connected to the camera. The detection unit identifies and calculates the position of the light spot on the image based on the image of the light spot on the receiving screen to obtain the position of the light spot on the receiving screen.

[0048] Reference Figure 1 In the imaging optical path shown in , when the monitoring point settles, the position of the laser light source changes by an amount H, which corresponds to a downward movement from the solid line position to the dashed line position in the figure. Accordingly, the position of the light spot formed by the laser light source's beam focusing on the receiving unit after passing through the optical unit changes by an amount H1. Because the distance L between the receiving unit and the optical unit is greater than twice the focal length f of the optical unit, according to the convex lens imaging principle, the displacement of the laser light source is amplified on the receiving unit. The deformation H of the laser light source can be calculated based on L, f, and H1, thereby determining the settlement amount of the laser light source corresponding to the monitoring point.

[0049] In some embodiments, reference Figure 2 、 34. The monitoring device 20 includes a housing 24. The optical unit 21 and the receiving unit 22 are respectively disposed in the housing 24.

[0050] Of course, the optical unit and the receiving unit can be set as a movable structure in the shell, so that the optical unit and the receiving unit can move in the axial direction in the shell, and the position of the optical unit and the receiving unit in the shell can be adjusted, thereby adapting to the measurement requirements of different settlement amounts and expanding the monitoring range of the device.

[0051] A laser emitting device 10 is set at the key detection points of the bridge (such as piers and supporting points), and the laser light sources at each monitoring point are respectively set in the direction of the monitoring device so that the laser beam emitted by the laser light source can be received by the monitoring device, thereby realizing the monitoring of the settlement at multiple monitoring points.

[0052] When using this monitoring method for measurement, the laser beam will diverge during long-distance transmission, resulting in a larger spot size received on the receiving unit of the monitoring device, resulting in inaccurate measurement of the displacement of the spot, affecting the accuracy of the settlement measurement.

[0053] When using a laser light source for measurement, the heat generated by the laser during operation will cause thermal noise, which will interfere with the detection accuracy and affect the focusing performance and stability of the laser beam. This will cause the light spot at the receiving end to jump during long-distance transmission measurement, affecting the accuracy and precision of the measurement.

[0054] In view of the problems of beam divergence and spot position fluctuation caused by thermal noise in long-distance transmission of laser light sources, such as Figure 5 The laser emitting device 10 set at each monitoring point includes a laser light source 11 and a laser processing unit 12 set on the optical path of the laser light source. The laser processing unit 12 is used to focus the laser beam and can focus the laser beam on the position of the optical unit of the monitoring device to form an image.

[0055] Reference Figure 5 The laser processing unit 12 can use two groups of lenses arranged in sequence to focus the laser beam separately through the two groups of lenses, and focus the laser beam on the position of the optical unit to form an image, control the jump of the light spot within the focus point, and reduce the influence of thermal noise on the beam path.

[0056] Among them, both lens groups are convex lenses.

[0057] The use of a laser processing unit at the front end to process the laser beam can effectively ensure the collimation and focusing of the laser beam at a long distance, reduce the divergence of the beam, and avoid the influence of thermal noise generated by the laser light source on the beam path, thereby ensuring the stability and uniformity of the beam and improving the accuracy of detection and measurement.

[0058] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. used to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as a limitation on the present invention.

[0059] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of this invention does not necessarily mean that the components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that the direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0060] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0061] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention falls within the scope of protection of the present invention.

Claims

1. Bridge settlement monitoring device, characterized in that: include: An optical unit, used to converge and deflect the received laser beam and form an image on the receiving unit to form a light spot; The receiving unit is arranged on an imaging side of the optical unit along the optical path, and the distance between the receiving unit and the optical unit is greater than twice the focal length of the optical unit.

2. The bridge settlement monitoring device according to claim 1, characterized in that: The optical unit is a Fresnel lens.

3. The bridge settlement monitoring device according to claim 1, characterized in that: The receiving unit adopts a photoelectric detector.

4. The bridge settlement monitoring device according to claim 3, characterized in that: The device further comprises a detection unit, which is electrically connected to the receiving unit.

5. The bridge settlement monitoring device according to claim 1, characterized in that: The receiving unit includes a receiving screen and a camera arranged on one side of the receiving screen, and the camera is used to capture an image of the light spot on the receiving screen.

6. The bridge settlement monitoring device according to claim 5, characterized in that: The receiving screen is a plane.

7. The bridge settlement monitoring device according to claim 5, characterized in that: The receiving screen is a convex spherical surface or a concave spherical surface.

8. The bridge settlement monitoring device according to any one of claims 5, 6 or 7, characterized in that: The device further comprises a detection unit, which is electrically connected to the camera.

9. The bridge settlement monitoring device according to any one of claims 1, 3 or 5, characterized in that: It comprises a shell, wherein the optical unit and the receiving unit are respectively arranged in the shell.

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