Laser transmitting terminal for settlement monitoring and bridge settlement monitoring system

Abstract

The utility model discloses a laser emitting end for settlement monitoring and a bridge settlement monitoring system, the laser emitting end comprises a laser emitting device arranged on a monitoring point position of a bridge, the laser emitting device is used for emitting laser beams to a monitoring device, and the laser emitting device comprises a laser light source, a laser receiving device and a laser receiving device, the laser processing unit is arranged on a light path of the laser light source and is used for focusing the laser beams and enabling the laser beams to be focused and imaged at the position where the optical unit of the monitoring device is located; and the optical unit is used for converging and deflecting the received laser beams and imaging on the receiving unit to form light spots. The laser processing unit is used for processing the laser beam at the front end, and the laser beam is focused and imaged at the optical unit, so that the problem of beam divergence during long-distance transmission of the laser beam is well solved, the influence of thermal noise on a beam path is solved, and the measurement precision during long-distance laser measurement is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to bridge monitoring technical field, concretely relates to a laser emission end for settlement monitoring and bridge settlement monitoring system. BACKGROUND

[0002] Bridge settlement monitoring has an important role in ensuring the safety of the bridge, and the current settlement monitoring of the bridge usually adopts the method of laser monitoring, which measures the deformation of the bridge by monitoring the change of the position of the laser.

[0003] When laser is used for bridge deformation and settlement monitoring, a laser light source is usually arranged on the monitoring point of the bridge, and when the monitoring point settles, the laser light source will displace with the bridge, and at this time, the displacement of the light spot formed by the laser light source on the receiving unit of the monitoring device is measured, so that the settlement of the monitoring point can be obtained, and the settlement monitoring of the bridge can be realized. When measuring by this monitoring method, the laser beam will diverge during long-distance transmission, resulting in a larger light spot size received on the receiving unit of the monitoring device, which leads to inaccurate measurement of the displacement of the light spot and affects the accuracy of the settlement measurement. When measuring with a laser light source, 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, resulting in jumping of the light spot at the receiving end during long-distance transmission measurement, which affects the accuracy and precision of the measurement. SUMMARY

[0004] The utility model aims at providing a laser emission end for settlement monitoring and a bridge settlement monitoring system to solve the problem of low measurement accuracy in the existing measurement method.

[0005] The utility model realizes the following technical scheme:

[0006] The laser emission end for settlement monitoring comprises a laser emission device arranged on the monitoring point of the bridge, and the laser emission device is used for emitting a laser beam to the monitoring device, and comprises:

[0007] A laser light source;

[0008] A laser processing unit is arranged on the optical path of the laser light source and is used for focusing processing the laser beam and enabling the laser beam to be focused and imaged on the position of the optical unit of the monitoring device;

[0009] The optical unit is used for converging and deflecting the received laser beam and forming a light spot on the receiving unit.

[0010] In some embodiments, the laser processing unit comprises two groups of lenses arranged in sequence along the light path, and the laser beam is focused by the two groups of lenses respectively.

[0011] In some embodiments, both groups of lenses are convex lenses.

[0012] In some embodiments, a pose adjusting device is further included, and the laser emitting device is arranged on the pose adjusting device, and the pose adjusting device is used for adjusting the levelness of the laser emitting device and adjusting the laser emitting device to be arranged horizontally.

[0013] In some embodiments, the pose adjusting device comprises:

[0014] A pose adjusting unit comprises a base, a turntable, a support and a gimbal, the turntable is rotationally connected on the base, a rotation motor is arranged on the base and used for driving the turntable to rotate, the support is arranged on the turntable, the gimbal is hinged between the support through a hinge shaft, a pitch motor is arranged on the support and used for driving the gimbal to pitch rotationally along the hinge shaft, and the laser emitting device is arranged on the gimbal; a first inclination sensor for detecting the inclination angle of the base is arranged on the base, a second inclination sensor for detecting the levelness of the gimbal is arranged on the gimbal, and an angle sensor for detecting the rotation angle is arranged on the rotation motor and the pitch motor.

[0015] A control unit, the first inclination sensor, the second inclination sensor and the angle sensor are electrically connected with the control unit respectively, and the control unit is electrically connected with the rotation motor and the pitch motor.

[0016] On the other hand, the application further provides a bridge settlement monitoring system, comprising:

[0017] A laser emitting end;

[0018] A monitoring device, the monitoring device comprises an optical unit and a receiving unit, the optical unit is used for converging and deflecting the received laser beam and imaging to form a light spot on the receiving unit.

[0019] In some embodiments, 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 greater than twice the focal length of the optical unit.

[0020] In some embodiments, the optical unit is a Fresnel lens.

[0021] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0022] The utility model discloses a laser light source is provided with laser processing unit, and the laser processing unit is arranged at the front end of laser light source, and the laser processing unit is used for processing the laser light beam, and the laser light beam is focused and imaged at the optical unit, thereby solving the problem of beam divergence of the laser light beam during long-distance transmission, and the influence of thermal noise on the light beam path is solved through the gathering processing of the light beam, thereby solving the problem of light spot jumping on the receiving unit and improving the measurement precision during long-distance measurement of the laser.

[0023] The laser emitting device is arranged on the pose adjusting device, and the pose of the laser emitting device is adjusted according to the detection of the pose state of the laser emitting device, so that the laser emitting device always maintains a horizontal state, the problem that the accurate monitoring of settlement is influenced by the change of the incidence angle of the laser light beam when the deformation or displacement in other directions except vertical settlement occurs at the monitoring point is solved, the calculation precision of the light spot displacement is ensured, and the accurate monitoring of the bridge settlement under various working conditions is realized. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the drawings in the embodiments 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 according to these drawings without creative labor.

[0025] Figure 1 It is the laser emitting end structure schematic view in another embodiment of the utility model.

[0026] Figure 2 It is the laser emitting end structure schematic view in another embodiment of the utility model.

[0027] Figure 3 It is the measurement principle schematic view of the bridge settlement monitoring system of the utility model.

[0028] Figure 4 It is the detection device structure schematic view in the embodiment of the utility model.

[0029] Among them:

[0030] 10, laser emitting device, 11, laser light source, 12, laser processing unit;

[0031] 20, monitoring device, 21, optical unit, 22, receiving unit, 222, receiving screen, 223, camera, 23, detection unit, 24, shell;

[0032] 31, head, 32, rotating motor, 33, pitching motor, 34, base, 35, turntable, 36, first inclination sensor, 37, second inclination sensor, 38, support, 39, control unit. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments.

[0034] In view of the problems of beam divergence and spot position jumping caused by thermal noise in long-distance transmission of laser light source, in some embodiments of the utility model, the laser emitting end includes a laser emitting device 10 arranged on the monitoring point of the bridge, and the laser emitting device is used for emitting a laser beam to the monitoring device, which comprises:

[0035] A laser light source 11;

[0036] A laser processing unit 12 is arranged on the optical path of the laser light source and is used for focusing processing of the laser beam and enabling the laser beam to be focused and imaged on the position of the optical unit of the monitoring device.

[0037] Here, the optical unit of the monitoring device is used for converging and deflecting the received laser beam and imaging the spot on the receiving unit.

[0038] Referring to Figure 1 The laser processing unit can adopt two groups of lenses arranged in sequence, which respectively focus process the laser beam through the two groups of lenses and enable the laser beam to be focused and imaged on the position of the optical unit, control the jumping of the spot within the focal point, and reduce the influence of thermal noise on the beam path.

[0039] Among them, the two groups of lenses are convex lenses.

[0040] The laser processing unit is used to process the laser beam at the front end, which can well ensure the collimation and focusing of the laser beam at a long distance, reduce the divergence of the beam, and at the same time avoid the influence of thermal noise generated by the laser light source on the beam path, ensure the stability and uniformity of the beam, and improve the detection accuracy.

[0041] When the bridge settlement monitoring is carried out in this way, the settlement amount when the bridge only settles in the vertical direction can be detected, but in actual working conditions, the bridge will usually displace in multiple directions, resulting in that the actual measurement result is difficult to truly reflect the settlement condition of the bridge, and the measurement result is inaccurate.

[0042] To solve the above problems, the pose adjusting device is further arranged at the laser emitting end, and the pose adjusting device is used to carry the laser emitting device and adjust the levelness of the laser emitting device to a horizontal state.

[0043] Therefore, when the pose adjusting device is fixedly installed on the monitoring point of the bridge, the laser emitting device can be kept in a horizontal state regardless of the direction of the settlement deformation of the bridge, so that the settlement deformation of the bridge under different deformation conditions can be monitored.

[0044] In some embodiments, the pose adjusting device comprises:

[0045] The pose adjusting unit comprises a base 34, a turntable 35, a support 38, and a holder 31. The turntable 35 is rotationally connected to the base 34, so that the turntable can rotate along the Z-axis thereof. A rotation motor 32 is arranged on the base 34, and the rotation motor 32 is used to drive the rotation of the turntable. The support 38 is arranged on the turntable 35, and the holder 31 is hingedly connected to the support 38 by a hinge shaft, so that the holder can be tilted relative to the XY plane. An inclination motor 33 is arranged on the support 38, and the inclination motor 33 is used to drive the holder to tilt along the hinge shaft. The laser emitting device 10 is arranged on the holder 31.

[0046] A first inclination sensor 36 is arranged on the base 34 to detect the inclination angle of the base. A second inclination sensor 37 is arranged on the holder 31 to detect the levelness of the holder. An angle sensor is arranged on the rotation motor 32 and the inclination motor 33 to detect the rotation angle.

[0047] A control unit 39 is electrically connected to the first inclination sensor 36, the second inclination sensor 37, and the angle sensor. The control unit 39 is electrically connected to the rotation motor 32 and the inclination motor 33.

[0048] Reference Figure 2 When the bridge settles in the Z direction and tilts in the positive X direction, the base is fixedly installed on the bridge, and the base tilts relative to the Y axis at this time. The base and the X-Y plane form a certain inclination angle. The inclination angle of the current base is detected by the first inclination sensor, and the inclination angle data is sent to the control unit. The control unit controls the operation of the inclination motor according to the inclination angle data, and drives the holder to tilt by the inclination motor, so that the holder is adjusted to a horizontal state.

[0049] The second inclination sensor arranged on the holder detects the levelness of the adjusted current holder, and sends the current angle data to the control unit. The control unit adjusts the holder according to the angle data of the holder, so as to ensure the adjustment accuracy of the levelness of the holder.

[0050] By adjusting the levelness of the pan / tilt platform, the laser emitting device at the laser emitting end is adjusted to be level.

[0051] At the same time, the angle sensor of the pitch motor detects the rotation angle of the pitch motor.

[0052] When calculating the vertical settlement of the bridge based on the displacement of the light spot, the rotation angle data of the pitch motor is introduced into the calculation of the actual vertical settlement of the laser emitting device. The posture adjustment data is combined with the displacement of the light spot to obtain the actual vertical settlement of the monitoring point.

[0053] Similarly, using the above method, when the bridge deforms and settles in other directions, the horizontality of the laser emitting device on the pan-tilt platform can be adjusted by controlling the rotation motor and pitch motor, so that the actual settlement amount of the monitoring point under different settlement conditions can be detected and the measurement accuracy can be well guaranteed.

[0054] On the other hand, the present invention provides a bridge settlement monitoring system based on the above-mentioned laser emitting end, comprising:

[0055] Laser emitting end;

[0056] And monitoring device 20, refer to Figure 3 and Figure 4 The monitoring device includes an optical unit 21, a receiving unit 22 and a detection unit 23. The optical unit 21 is used to converge and deflect the received laser beam and form an image on the receiving unit 22 to form a light spot.

[0057] In some embodiments, receiving unit 22 is positioned along the optical path on one side of the optical unit's imaging surface, with the spacing between receiving unit 22 and the optical unit being greater than twice the focal length of the optical unit. This spacing allows the displacement of the light spot on the receiving unit to amplify the displacement of the laser light source, thereby improving the accuracy of settlement measurements at bridge monitoring points.

[0058] 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.

[0059] The receiving unit 22 may include a receiving screen 222 and a camera 223 . The camera 223 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.

[0060] Reference Figure 4The monitoring device 20 includes a housing 24 , and the optical unit 21 and the receiving unit 22 are respectively disposed in the housing 24 .

[0061] The receiving screen can be set to a plane, or the receiving screen 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 settlement.

[0062] The monitoring device also includes a detection unit 23, which is used to calculate the displacement of the light spot based on 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 obtain the settlement amount of the corresponding monitoring point based on the displacement of the light spot.

[0063] The detection unit 23 is electrically connected to the camera 223. The detection unit identifies and calculates the position of the light spot on the image acquired based on the image of the light spot on the receiving screen, and obtains the position of the light spot on the receiving screen.

[0064] 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.

[0065] Reference Figure 3 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.

[0066] 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.

[0067] In addition, in the description of the utility model, if the terms such as ''horizontal'', ''vertical'' etc. appear, it does not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, ''horizontal'' only means that it is more horizontal relative to ''vertical'', and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0068] In the description of the utility model, it also needs to be explained that, unless there is explicit provision and limitation, if the terms ''set'', ''install'', ''connect'' and ''connect'' appear, they should be understood in a broad sense. For example, it can be fixed connection, or detachable connection, or integrated connection. It can be mechanical connection, or electrical connection. It can be directly connected, or indirectly connected through an intermediate medium. It can be the communication inside two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0069] The above is only the preferred embodiment of the utility model, and does not limit the utility model in any form. Any simple modification or equivalent change made according to the technical essence of the utility model to the above embodiment falls within the protection scope of the utility model.

Claims

1. A laser transmitter for sedimentation monitoring, characterized in that: The laser emitting end includes a laser emitting device provided at a monitoring point of the bridge, and the laser emitting device is used to emit a laser beam to the monitoring device, including: Laser light source; A laser processing unit is provided on the optical path of the laser light source and is used to focus the laser beam and enable the laser beam to be focused and imaged at the position where the optical unit of the monitoring device is located; The optical unit is used to converge and deflect the received laser beam and form an image on the receiving unit to form a light spot.

2. The laser emitting end for sedimentation monitoring according to claim 1, characterized in that: The laser processing unit includes two groups of lenses arranged in sequence along the optical path, and the laser beam is focused by the two groups of lenses respectively.

3. The laser emitting end for sedimentation monitoring according to claim 1, characterized in that: Both lens groups are convex lenses.

4. The laser emitting end for sedimentation monitoring according to claim 1, characterized in that: It also includes a posture adjustment device, the laser emitting device is arranged on the posture adjustment device, and the posture adjustment device is used to adjust the horizontality of the laser emitting device and adjust the laser emitting device to a horizontal setting.

5. The laser emitting end for sedimentation monitoring according to claim 4, characterized in that: The posture adjustment device comprises: The posture adjustment unit includes a base, a turntable, a support and a pan-tilt head, the turntable is rotatably connected to the base, the base is provided with a rotating motor, the rotating motor is used to drive the turntable to rotate, the support is provided on the turntable, the pan-tilt head and the support are hinged via a hinge axis, the support is provided with a pitch motor, the pitch motor is used to drive the pan-tilt head to pitch and rotate along the hinge axis, and the laser emitting device is provided on the pan-tilt head; the base is provided with a first inclination sensor for detecting the tilt angle of the base, the pan-tilt head is provided with a second inclination sensor for detecting the horizontality of the pan-tilt head, and the rotating motor and the pitch motor are both provided with angle sensors for detecting the rotation angle; A control unit, wherein the first tilt sensor, the second tilt sensor and the angle sensor are electrically connected to the control unit respectively, and the control unit is electrically connected to the rotation motor and the pitch motor.

6. Bridge settlement monitoring system, characterized in that, include: The laser emitting end according to any one of claims 1 to 5; The monitoring device includes an optical unit and a receiving unit. The optical unit is used to converge and deflect the received laser beam and form an image on the receiving unit to form a light spot.

7. The bridge settlement monitoring system according to claim 6, characterized in that: The receiving unit is arranged along the light path at an imaging side of the optical unit, and the distance between the receiving unit and the optical unit is greater than twice the focal length of the optical unit.

8. The bridge settlement monitoring system according to claim 6, characterized in that: The optical unit is a Fresnel lens.

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