Laser emitting device for bridge settlement monitoring and settlement monitoring system

Abstract

The utility model discloses a laser emitting device for bridge settlement monitoring and a settlement monitoring system, and the laser emitting device is respectively arranged at each monitoring point position of a bridge and is used for emitting laser to a monitoring device; comprising a laser light source, and laser emitting devices on all monitoring point positions are arranged in the direction where monitoring devices are located, so that laser beams emitted by the laser light source can be received by the monitoring devices; and the light source identification unit is used for identifying the laser beams of the laser light sources on the monitoring point positions, so that light spots formed by the laser beams on the monitoring device have different colors, modulation frequencies and patterns. The light source identification unit is arranged on one side of the laser light source, and the laser beams of the laser emitting devices on the monitoring points are identified, so that synchronous monitoring of the multiple monitoring points of the bridge is realized, the monitoring efficiency is improved, and non-delay and synchronous monitoring of deformation on the multiple points of the bridge is well met.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge monitoring, and in particular relates to a laser emitting device for bridge settlement monitoring and a settlement monitoring system. 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 settlement deformation of the bridge by monitoring the changes in the laser position. When monitoring a bridge, many monitoring points are required. Usually, laser light sources are set at different key points on the bridge, and then each laser light source is controlled to emit lasers to the monitoring device at intervals to monitor the settlement at each monitoring point. When this monitoring method of emitting lasers at intervals is used, when there are many points to be monitored, it takes a long time to complete a round-robin monitoring, and the monitoring interval in one monitoring is also long, which makes it difficult to meet the demand for synchronous monitoring of all monitoring points. Utility Model Content

[0003] The purpose of the utility model is to provide a laser emitting device and a settlement monitoring system for bridge settlement monitoring, so as to solve the problem that it is difficult to realize the demand of synchronous monitoring of multiple monitoring points.

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

[0005] A laser emitting device for bridge settlement monitoring, wherein the laser emitting device is respectively arranged at each monitoring point of the bridge and is used to emit a laser beam to the monitoring device; comprising:

[0006] Laser light source: the laser emitting devices at each monitoring point are respectively arranged 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;

[0007] The light source identification unit is used to identify the laser beam of the laser light source at each monitoring point, so that the light spot formed by the laser beam on the monitoring device has different colors, modulation frequencies, and patterns.

[0008] In some embodiments, the light source identification unit includes filters with different colors arranged on the light paths of different laser light sources.

[0009] In some embodiments, the light source identification unit includes a marking plate with different patterns arranged on the optical path of the laser light source. When the laser beam passes through the pattern on the marking plate, a light spot with a corresponding pattern can be obtained on the monitoring device.

[0010] In some embodiments, the light source identification unit comprises laser modulation modules arranged on different laser light sources, and the laser modulation modules are used for modulating the laser beams into different modulation frequencies.

[0011] In some embodiments, a laser processing unit is further included, which is arranged on the light path of the laser light source and is used for focusing processing of the laser beam and capable of focusing the laser beam to form an image at the position of the optical unit of the monitoring device;

[0012] The optical unit is used for converging and deflecting the received laser beam and imaging to form a light spot on the receiving unit.

[0013] 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.

[0014] In some embodiments, both of the two groups of lenses are convex lenses.

[0015] In another aspect, the utility model also provides a settlement monitoring system, comprising:

[0016] A laser emitting device;

[0017] A monitoring device, the monitoring device comprises an optical unit, a receiving unit and a detection 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, and the detection unit is used for identifying the color, modulation frequency and pattern of the light spot on the receiving unit.

[0018] 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.

[0019] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0020] In the utility model, the light source identification unit is arranged on the side of the laser light source, the laser beams of the laser emitting devices on each monitoring point are identified, and the laser light sources emitted by each monitoring point can be received by the same monitoring device simultaneously, the identification features of the laser light sources are identified by the monitoring device according to the different identification features of the laser beams, the light source beams and the formed light spots are associated with the monitoring points, the settlement conditions of each corresponding monitoring point can be obtained simultaneously according to the displacement data of each light spot, the synchronous monitoring of the bridge multiple monitoring points is realized, the monitoring efficiency is improved, and the deformation amount of the bridge multiple points is monitored synchronously without delay.

[0021] The laser processing unit is arranged on one side of the laser light source, the laser beam is processed at the front end by the laser processing unit, the laser beam is focused and imaged at the optical unit, the problem of beam divergence during long-distance transmission of the laser beam is well solved, the influence of thermal noise on the beam path is solved through the gathering processing of the beam, the problem of spot jumping on the receiving unit of the monitoring device is well solved, and the measurement precision during long-distance deposition measurement using the laser light source is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings in the embodiments will be briefly introduced as follows, and it should be understood that the following drawings only show some embodiments of the present application, 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.

[0023] Figure 1 The structure schematic view of the laser emitting device for measuring multiple monitoring points of the bridge in the embodiments of the present application.

[0024] Figure 2 The structure schematic view of the light source identification unit adopting the filter in the embodiments of the present application.

[0025] Figure 3 The structure schematic view of the light source identification unit adopting the marker plate in the embodiments of the present application.

[0026] Figure 4 The structure schematic view of the light source identification unit adopting the laser modulation module in the embodiments of the present application.

[0027] Figure 5 The optical path diagram of the laser processing unit in the embodiments of the present application.

[0028] Figure 6 The measurement principle diagram of the monitoring device in the embodiments of the present application.

[0029] Figure 7 The structure schematic view of the monitoring device in the embodiments of the present application.

[0030] Among them:

[0031] 10, laser emitting device, 11, laser light source, 12, laser processing unit, 13, marker plate, 14, filter, 15, laser modulation module;

[0032] 20, monitoring device, 21, optical unit, 22, receiving unit, 222, receiving screen, 223, camera, 23, detection unit, 24, shell. 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 clearly and completely described 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] When laser is used to monitor the deformation and settlement of a bridge, a laser light source is usually arranged at a monitoring point on the bridge. When the monitoring point settles, the laser light source will displace with the bridge. 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 of the bridge can be monitored.

[0035] When multiple monitoring points are monitored in a round-robin manner, a long time is needed for completing one monitoring, synchronous monitoring of multiple monitoring points cannot be realized, and there is a time delay in monitoring between the monitoring points. For example, the interval time of emitting laser beams between each laser light source is set to 5s. When 10 monitoring points need to be measured, the time interval between the first monitoring point and the last monitoring point is 45s.

[0036] In order to solve the problem that all monitoring points need to be monitored synchronously in some scenarios, a laser emitting device for bridge settlement monitoring is provided in the utility model. The laser emitting device is arranged at each monitoring point on the bridge, and is used to emit laser to the monitoring device.

[0037] As shown in Figure 1 , the laser emitting device 10 is arranged at multiple key monitoring points (such as piers and bearing points) of the bridge. The laser emitting device at each monitoring point is arranged towards the direction of the monitoring device, so that the laser beams emitted by the laser emitting device can be received by the monitoring device. In this way, the settlement of multiple monitoring points can be monitored.

[0038] The monitoring device 20 is arranged at a position opposite to the monitoring points on the bridge. The laser beams emitted by the laser emitting devices at the monitoring points are received, and the displacement of the laser emitting devices is measured, so that the settlement of each monitoring point can be obtained. In order to receive the laser beams of multiple laser emitting devices at each monitoring point and form an image on the monitoring device, the monitoring device is usually arranged at a large distance from the bridge, for example, a distance of 10-100m or more. The specific distance is determined according to the number of monitoring points needed to be monitored on the bridge and the interval distance between the monitoring points.

[0039] In some embodiments, refer to Figure 2 , Figure 3 and Figure 4The laser emitting device comprises:

[0040] The laser light source 11 is arranged on each monitoring point in the direction of the monitoring device, so that the laser light beam emitted by the laser light source can be received by the monitoring device.

[0041] The light source identification unit is used to identify the laser light beam of each monitoring point, so that the light spot formed on the monitoring device has different colors, modulation frequencies, and patterns.

[0042] The light source identification unit uses a filter 14 with different colors arranged on the light path of the emission end of different laser light sources. The filter 14 uses a laser filter with high color rendering to reduce the impact on light intensity, so that the light spot formed by the light beam of the laser light source on each monitoring point on the receiving unit has different colors, and ensures the uniqueness of each light spot color.

[0043] When the laser light source emits laser light to the monitoring device, the color of each light spot is identified by the monitoring device, and the displacement data of each light spot is associated with each monitoring point, so that synchronous monitoring of all monitoring points can be realized.

[0044] In some embodiments, the light source identification unit can use a marking plate 13 with different patterns arranged on the light path of the emission end of each laser light source. When the laser light beam passes through the pattern on the marking plate, a light spot with a corresponding pattern can be obtained on the monitoring device.

[0045] The marking plate 13 is made of an opaque plastic plate, and a specific pattern is processed on the plastic plate. The pattern position allows light to pass through. When the laser light beam passes through the pattern on the marking plate, a light spot with a corresponding pattern can be obtained on the receiving unit.

[0046] Similarly, by identifying the pattern of each light spot image by the monitoring device, the displacement data of each light spot is associated with each monitoring point, so that synchronous monitoring of all monitoring points can be realized.

[0047] In some embodiments, the light source identification unit can use a laser modulation module 15 arranged on different laser light sources. The laser modulation module 15 is used to modulate the laser light beam to have different modulation frequencies.

[0048] For example, the laser modulation module is used to modulate the laser signal at different frequencies such as 1000Hz, 2000Hz, and 3000Hz, so that the laser light beam has different modulation frequencies. The modulation frequencies of each laser light source should differ by at least 500Hz to facilitate identification by the back-end monitoring device.

[0049] Correspondingly, by demodulating and identifying the modulation frequency of each light spot through the monitoring device, the displacement data of each light spot is associated with each monitoring point, so that the synchronous monitoring of all monitoring points can be realized.

[0050] In some embodiments, the light source identification unit can adopt a combination of filters, marker plates and laser modulation modules, so that the laser beam has the combined characteristics of different colors, different patterns and different modulation frequencies. Correspondingly, the monitoring device can realize the association of different light spots with corresponding monitoring points by identifying the color, pattern and modulation frequency.

[0051] When measuring by using this monitoring method, the laser beam will diverge during long-distance transmission of the laser, resulting in a larger size of the light spot 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.

[0052] When measuring by using the laser light source, the heat generated by the laser during operation will cause thermal noise, which will interfere with the detection accuracy, affect the focusing performance and stability of the laser beam, and cause the light spot at the receiving end to jump during long-distance transmission measurement, affecting the accuracy and precision of the measurement.

[0053] In view of the problems of beam divergence and light spot position jumping caused by thermal noise of the laser light source during long-distance transmission, in some embodiments, the laser emitting device further comprises a laser processing unit arranged at the emitting end of the laser light source for focusing processing of the laser beam and enabling the laser beam to be focused and imaged at the position of the optical unit of the monitoring device.

[0054] Here, the optical unit of the monitoring device is used to converge and deflect the received laser beam and form a light spot on the receiving unit.

[0055] Referring to Figure 5 The laser processing unit 12 can adopt two groups of lenses arranged in sequence, which respectively focus the laser beam through the two groups of lenses and focus the laser beam to be imaged at the position of the optical unit, so as to control the jumping of the light spot within the focal point and reduce the influence of thermal noise on the beam path.

[0056] Among them, the two groups of lenses are convex lenses.

[0057] By using the laser processing unit to process the laser beam at the front end, the collimation and focusing of the laser beam at a long distance can be well ensured, the divergence of the beam is reduced, and the influence of thermal noise generated by the laser light source on the beam path can be avoided, so as to ensure the stability and uniformity of the beam and improve the detection and measurement accuracy.

[0058] As shown in Figure 2 、 Figure 3 and Figure 4 , the laser light source, the light source identification unit and the laser processing unit can be integrated. Taking the laser processing unit using a filter as an example, a filter is arranged at the exit end of the laser light source, and then two sets of lenses of the laser processing unit are arranged in sequence; taking the laser processing unit using a marking plate as an example, two sets of lenses of the laser processing unit are arranged in sequence at the exit end of the laser light source, a marking plate is arranged on the exit light path of the laser processing unit, and the exiting light beam can pass through the pattern on the marking plate.

[0059] On the other hand, the utility model provides a kind of based on above-mentioned laser emission device's sedimentation monitoring system, comprising:

[0060] The laser emission device 10 in the above embodiment;

[0061] And monitoring device 20, refer to Figure 6 And Figure 7 , monitoring device includes optical unit 21, receiving unit 22 and detection unit 23, optical unit 21 is used to converge and deflect the received laser light beam and form light spot on receiving unit imaging, detection unit 23 is used to identify the color, modulation frequency, pattern of light spot on receiving unit.

[0062] Taking the light source identification unit using the filter with different colors arranged on the light path of the emission end of different laser light sources as an example, receiving unit can use receiving screen and high-resolution camera supporting multiple channels, utilize multi-channel color resolution module (such as three primary color spectrometer or multi-band sensor), camera automatically captures the color pattern of light spot on receiving screen.

[0063] Detection unit identifies the monitoring point corresponding to different light spots on receiving unit by identifying the color of light spot image. The processing of light spot image can use existing image processing algorithm, which is based on HSV (hue-saturation-brightness) or RGB space segmentation method, and automatically detects and marks the coordinates of light spots of different colors through color difference. For example, using open source image processing library (such as OpenCV) to generate processing program can realize calculating the coordinates of light spots of various colors identified in image, and associating and matching the color with corresponding monitoring point.

[0064] Taking the light source identification unit using the marking plate with different patterns arranged on the light path of the emission end of each laser light source as an example,

[0065] Detection unit identifies the monitoring point corresponding to different light spots on receiving screen of receiving unit by identifying the pattern of light spot image, thereby establishing the association between each light spot on receiving unit and corresponding monitoring point.

[0066] TakingFigure 3 As shown in the laser emitting device 10 in the middle, the laser emitting device 10 includes a laser as a laser light source 11, a laser processing unit 12 and a marking plate 13, which are sequentially arranged along the light path. The laser processing unit is used for focusing the laser beam emitted by the laser, and when the laser beam passes through the pattern on the marking plate, a light spot with a corresponding pattern can be obtained on the receiving unit.

[0067] Taking the laser modulation module arranged on different laser light sources as an example of the light source identification unit, and taking the photoelectric sensor with high-speed sampling function or the camera with demodulation function as the receiving unit, the light signal is detected by the photodiode, and the adjustment signal is converted into an electrical signal.

[0068] The detection unit identifies the monitoring points corresponding to different light spots on the receiving unit according to the modulation frequency characteristics of the light spots, and establishes the correlation between different light spots and corresponding monitoring points on the receiving unit.

[0069] The laser beam modulation frequency is demodulated, and the fast Fourier transform (FFT) can be used to extract the frequency characteristics of each light spot, and the monitoring points are automatically matched according to the frequency characteristics of the light spots.

[0070] In order to improve the accuracy of monitoring and identification, hardware low-pass filtering can be used to reduce high-frequency noise interference, and digital filtering can be used to remove the influence of background light and other stray light.

[0071] Because the deformation and settlement of the bridge are usually small, usually in millimeter or sub-millimeter level, it is difficult to accurately measure the displacement of such small light spots on the receiving end, which affects the accurate measurement of the bridge settlement.

[0072] In order to solve the above problems, in some embodiments, the receiving unit 22 is arranged on the imaging side of the optical unit along the light path, and the distance between the receiving unit 22 and the optical unit 21 is greater than twice the focal length of the optical unit, so that the displacement of the light spot on the receiving unit can be amplified.

[0073] Here, the optical unit is used to converge the laser beam, reduce the size of the light spot imaged on the receiving unit, and solve 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.

[0074] 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 be amplified by a multiple of the displacement of the laser light source, thereby improving the measurement accuracy of the bridge monitoring point settlement.

[0075] In some embodiments, the optical unit can employ a convex lens or a Fresnel lens with similar functions to focus the light rays. The lens with focusing function is used to converge and focus the laser beam, reduce the size of the light spot formed by the laser beam, and improve the measurement accuracy of the light spot displacement.

[0076] In some embodiments, the receiving unit 22 can employ a receiving screen 222 and a camera 223 for acquiring the image of the light spot on the receiving screen, and calculate the position of the light spot on the receiving screen according to the acquired image of the light spot on the receiving screen.

[0077] As Figure 7 The monitoring device 20 includes a housing 24, and the optical unit 21 and the receiving unit 22 are arranged in the housing 24, respectively.

[0078] The receiving screen 222 can be arranged as a plane, or arranged as a convex or concave spherical surface to increase the receiving area of the receiving screen and the detection range of the settlement amount.

[0079] The displacement of the light spot is calculated according to 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 the settlement amount of the corresponding monitoring point is obtained according to the displacement of the light spot.

[0080] The initial position of the laser light source refers to the position of the monitoring point when no settlement deformation occurs. After the laser emitting devices are arranged on the bridge, the positions of the light spots of the laser beams of the laser light sources on the receiving unit are measured, and these light spot position data are stored as initial data. In the subsequent settlement monitoring, the current light spot position data are compared with the initial data to calculate the displacement of the light spot.

[0081] In some embodiments, the detection unit can identify the color, pattern, and modulation frequency of the light spot, and calculate the displacement of the light spot according to 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 obtain the settlement amount of the corresponding monitoring point according to the displacement of the light spot.

[0082] For example, when the receiving unit employs a receiving screen and a camera, the detection unit is electrically connected with the camera, and the detection unit identifies and calculates the characteristic information and position of the light spot on the image according to the acquired image of the light spot on the receiving screen to obtain the position data of each light spot on the receiving screen.

[0083] Referring to Figure 6The measurement principle diagram of the monitoring system shown in the figure, when the monitoring point subsides, the position of the laser emitting device changes, the change amount is H, the corresponding in the figure is from the solid line position to the dashed line position; Correspondingly, the position of the light spot formed by the light beam of the laser light source passing through the optical unit and focusing on the receiving unit changes, and the change amount is 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 lens light path imaging principle, the displacement amount of the laser light source is amplified on the receiving unit, and the deformation amount H of the laser light source can be calculated according to L, f and H1, so that the subsidence amount of the laser emitting device corresponding to the monitoring point can be obtained.

[0084] In the description of the utility model, it needs to be explained that the adopted terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the utility model product is used, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, structure and operation, therefore it cannot be understood as a limitation on the utility model.

[0085] In addition, in the description of the utility model, the terms "horizontal", "vertical" and the like do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0086] In the description of the utility model, it also needs to be explained that, unless otherwise explicitly specified and limited, if the terms "set", "install", "connect", "connect" appear, they should be understood in a broad sense, for example, they can be fixedly connected, or they can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium; can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0087] The above is only the preferred embodiment of the utility model, and does not limit the utility model in any form, and any simple modification, equivalent change of the above embodiment according to the technical essence of the utility model falls within the protection scope of the utility model.

Claims

1. A laser emitting device for bridge settlement monitoring, characterized in that: The laser emitting devices are respectively arranged at various monitoring points of the bridge and are used to emit laser beams to the monitoring devices; including: Laser light source: the laser emitting devices at each monitoring point are respectively arranged 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; The light source identification unit is used to identify the laser beam of the laser light source at each monitoring point, so that the light spot formed by the laser beam on the monitoring device has different colors, modulation frequencies, and patterns.

2. The laser emitting device for bridge settlement monitoring according to claim 1, characterized in that: The light source identification unit includes filters with different colors arranged on the light paths of different laser light sources.

3. The laser emitting device for bridge settlement monitoring according to claim 1 or 2, characterized in that: The light source identification unit includes a marking plate with different patterns arranged on the optical path of the laser light source. When the laser beam passes through the pattern on the marking plate, a light spot with a corresponding pattern can be obtained on the monitoring device.

4. The laser emitting device for bridge settlement monitoring according to claim 1, characterized in that: The light source identification unit includes laser modulation modules arranged on different laser light sources, and the laser modulation modules are used to modulate the laser beams to have different modulation frequencies.

5. The laser emitting device for bridge settlement monitoring according to claim 1, characterized in that: It also includes a laser processing unit, which is arranged on the optical path of the laser light source and is used to focus the laser beam and focus the laser beam on the position of the optical unit of the monitoring device to form an image; 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.

6. The laser emitting device for bridge settlement monitoring according to claim 5, 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.

7. The laser emitting device for bridge settlement monitoring according to claim 1, characterized in that: Both lens groups are convex lenses.

8. The settlement monitoring system is characterized by: include: The laser emitting device according to any one of claims 1 to 7; A monitoring device, comprising an optical unit, a receiving unit and a detection unit, wherein 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, and the detection unit is used to identify the color, modulation frequency and pattern of the light spot on the receiving unit.

9. The settlement monitoring system according to claim 8, 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.

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