A dual redundant high-precision coded target for tunnel visual displacement measurement

Abstract

The utility model provides a dual-redundant high-precision coded target for tunnel visual displacement measurement, which belongs to the technical field of tunnel engineering measurement, and comprises a light source plate, wherein a circular carbon plate and a strip coding plate are arranged on the light source plate, a detection area is arranged in the central area of ​​the circular carbon plate, the strip coding plate is processed from a carbon plate and arranged below the circular carbon plate, the circular carbon plate adopts a matte carbon material, the circular carbon plate is formed into a detection area by laser cutting, the detection area comprises one or more hollow areas, the detection area comprises two triangular hollow areas, the two triangular hollow areas are centrally symmetrical, in a dark light environment of a tunnel, the utility model has obvious markings, low energy consumption, and is easy to identify, and is numbered, the central area is designed as a symmetrical triangular concentric pattern, two different algorithms can be used to extract sub-pixel coordinates of the target center, which is helpful to improve accuracy and reliability and eliminate measurement errors.

Description

Technical Field

[0001] The utility model belongs to the technical field of tunnel engineering measurement, and in particular relates to a double redundant high-precision coding target for tunnel visual displacement measurement. Background Art

[0002] There are many traditional methods for monitoring structural displacement: (1) Traditional measurement method, which is the most widely used. The instruments used in this method mainly include theodolite, level and total station. The disadvantage is that it is greatly affected by terrain visibility and climatic conditions, and it cannot monitor continuously; (2) Close-range photogrammetry method, the main measuring instruments used are binocular cameras, photogrammetry workstations, etc. The disadvantage is that the data volume is large and the analysis is slow; (3) GPS method measures structural displacement. It has the characteristics of high precision, all-weather and continuous monitoring. Even if the target undergoes complex movement, the movement displacement can be monitored. However, this equipment is expensive and is greatly affected by the surrounding high-rise buildings, trees and mountains. It must be used in an open-air environment; (4) Contact measuring instruments, such as displacement meters, can measure the displacement of the structure. The disadvantage is that the range is limited, it needs to be embedded in advance, only one point can be measured at a time, and the sampling frequency is limited.

[0003] In order to solve the shortcomings of the above measurement methods, monocular vision measurement, as a new technology that combines the advantages of non-contact, low cost, high resolution and long distance, has attracted much attention. Thanks to the continuous progress of computer technology, image acquisition equipment and image processing algorithms, visual measurement has been widely used in aerospace, transportation, machine manufacturing, civil engineering and other fields. In the field of civil engineering, visual measurement provides a more convenient technical means for monitoring the structural displacement of tunnels, bridges and high-rise buildings.

[0004] The target of visual displacement detection is mainly used in the process of tunnel construction or monitoring to measure the displacement changes of the tunnel wall and the geology around the tunnel. In tunnel construction, it can be used to monitor important parameters such as the deformation of the tunnel structure and the stability of geological conditions. The displacement data collected by the target can be processed and analyzed in real time by computer software, so that engineers or monitoring personnel can timely understand the real-time changes of the tunnel project and take necessary adjustments and measures.

[0005] However, targets are usually used in dark and humid tunnel environments and are easily contaminated or corroded, affecting long-term reliable operation and data accuracy. Therefore, an easily identifiable and corrosion-resistant target is needed. Utility Model Content

[0006] In order to solve the above problems of existing targets, the utility model provides a dual redundant high-precision coded target for tunnel visual displacement measurement. In the dark light environment of the tunnel, designing a target with obvious markings, low energy consumption, easy identification and numbering is an important component for realizing tunnel visual displacement measurement.

[0007] The utility model adopts the following technical solutions to solve the above problems:

[0008] A dual-redundant high-precision coding target for tunnel visual displacement measurement comprises a light source plate, on which a circular carbon plate and a bar coding plate are arranged, a detection area is arranged in the central area of ​​the circular carbon plate, and the bar coding plate is processed from a carbon plate and arranged below the circular carbon plate.

[0009] Furthermore, the circular carbon plate is made of matte carbon material, and the circular carbon plate is cut by laser to form a detection area, and the detection area includes one or more hollow areas.

[0010] Furthermore, the detection area includes two triangular hollow areas, and the two triangular hollow areas are centrally symmetrical.

[0011] Furthermore, the light source board adopts an LED light source, and a plurality of LED lamp beads are evenly arranged inside the light source board.

[0012] Furthermore, the LED lamp beads are connected to a circuit control board, and the circuit control board controls the brightness and flashing frequency of the LED lamp beads.

[0013] Furthermore, the barcode plate contains unique coding information, and the coding rule is one bit at an interval of 3 mm.

[0014] Furthermore, the light source plate, the circular carbon plate and the bar coding plate are externally packaged and fixed by transparent packaging materials.

[0015] Furthermore, the packaging material is made of a resin material with high heat resistance and high UV resistance.

[0016] The beneficial effects of the utility model are:

[0017] 1. In the dark light environment of the tunnel, this target has obvious identification, low energy consumption, and is easy to identify. It is also numbered and is an important part of realizing the visual displacement measurement of the tunnel;

[0018] 2. The central area of ​​the circular carbon plate is designed into a symmetrical triangular concentric pattern, and two different algorithms can be used to extract the sub-pixel coordinates of the target center, which helps to improve accuracy and reliability and eliminate measurement errors;

[0019] 3. The barcode plate can give each monitoring target a unique ID to reduce the occurrence of cross-errors;

[0020] 4. This target has the function of dual detection of the center point to ensure the uniqueness of the center point;

[0021] 5. After placing the LED light source board, circular carbon plate and bar coding plate in the appropriate position, use resin to encapsulate them to ensure the stability and durability of the target. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present utility model, the drawings required for use in the description of the specific implementation methods will be briefly introduced below. Obviously, the drawings in the following description are some implementation methods of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the structure of the utility model;

[0024] Figure 2 It is a schematic diagram of the installation structure of the utility model.

[0025] In the figure, 1-light source board; 2-carbon board; 3-bar coding board; 4-detection area; 5-mold. DETAILED DESCRIPTION

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "connection" 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 or connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] like Figure 1 As shown, the utility model provides a dual redundant high-precision coding target for tunnel visual displacement measurement, including a light source board 1, on which a circular carbon plate 2 and a bar coding plate 3 are provided, a detection area 4 is provided in the central area of ​​the circular carbon plate 2, and the bar coding plate 3 is processed from a carbon plate and arranged below the circular carbon plate 2.

[0028] The entire light source board 1 adopts a 15cm×15cm square LED light source board. The light source board 1 adopts an LED light source. A plurality of high-brightness and long-life LED lamp beads are evenly arranged inside the light source board 1. The LED lamp beads are connected to a circuit control board. The circuit control board controls the brightness and flashing frequency of the LED lamp beads. The square LED light source board can ensure low power consumption and provide a light source with stable brightness through light emission, thereby ensuring consistency during the measurement process.

[0029] The circular carbon plate 2 has a size of 10cm×10cm and a thickness of 1mm and is made of matte carbon material. The circular matte carbon plate has good light-shielding properties and can provide clear reflection signals. Laser cutting is used to ensure smooth and uniform edges to provide good graphic features. The circular carbon plate 2 is formed into a detection area 4 by laser cutting. The detection area 4 includes one or more hollow areas. In the present embodiment, the detection area 4 includes two triangular hollow areas, and the two triangular hollow areas are centrally symmetrical. The centrally symmetrical triangular concentric pattern can provide additional redundant measurement methods to enhance the reliability and accuracy of the measurement. Two different algorithms can be used to extract the sub-pixel coordinates of the target center, which helps to improve accuracy and reliability and eliminate measurement errors.

[0030] The barcode plate 3 contains unique coding information. The barcode information is processed onto the carbon plate using a laser or other appropriate processing method. The barcode is encoded at intervals of 3mm as a bit. The black block is identified as the head code. The code is encoded every 3mm, and 7 bits can be edited, for a total of 127 numbers. The barcode plate can give each monitoring target a unique ID to reduce the occurrence of cross errors.

[0031] like Figure 2 As shown, the light source board 1, the circular carbon plate 2 and the bar code plate 3 are externally encapsulated and fixed by a transparent encapsulation material. In this embodiment, the encapsulation material adopts a highly heat-resistant and highly UV-resistant resin material to ensure the stability and durability of the target. During assembly, the light source board 1, the circular carbon plate 2 and the bar code plate 3 are placed flat in the mold 5, and then the resin is prepared and introduced into the mold, and the encapsulation is completed after the resin solidifies.

[0032] The utility model relates to a double redundant high-precision coding target for tunnel visual displacement measurement, which is provided with a target surface composed of a light source plate 1, a circular carbon plate 2 with a symmetrical triangular concentric pattern and a bottom bar coding plate 3, and finally encapsulated with resin; during use, the square LED light source plate can ensure low power consumption, and provide a light source with stable brightness by emitting light, so as to ensure consistency in the measurement process; the circular matte carbon plate has good shading characteristics, and can provide a clear reflection signal; the bar coding plate 3 is also processed by a carbon plate, and the central symmetrical triangular concentric pattern of the circular carbon plate 2 can provide an additional redundant measurement method to enhance the reliability and accuracy of the measurement; the target has a central point double detection function to ensure the uniqueness of the central point, and when in use, it is only necessary to punch a hole on any side of the encapsulated target, fix it on the object to be monitored with a metal fixing seat, and adjust the target surface to face the camera, and the LED light emission needs to be connected to a 12V DC power supply, and a rectifier power supply can be equipped in the detection area to connect to the mains.

[0033] The above embodiments are used to describe the present invention in detail, but the contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of application of the present invention shall still fall within the scope of the patent coverage of the present invention.

Claims

1. A dual redundant high-precision coded target for tunnel visual displacement measurement, characterized in that: The invention comprises a light source plate (1), wherein a circular carbon plate (2) and a bar code plate (3) are provided on the light source plate (1), a detection area (4) is provided in the central area of ​​the circular carbon plate (2), and the bar code plate (3) is processed from a carbon plate and is arranged below the circular carbon plate (2).

2. A dual redundant high-precision coded target for tunnel visual displacement measurement according to claim 1, characterized in that: The circular carbon plate (2) is made of matte carbon material. The circular carbon plate (2) is cut by laser to form a detection area (4), and the detection area (4) includes one or more hollow areas.

3. A dual redundant high-precision coded target for tunnel visual displacement measurement according to claim 2, characterized in that: The detection area (4) comprises two triangular hollow areas, and the two triangular hollow areas are centrally symmetrical.

4. The dual redundant high-precision coded target for tunnel visual displacement measurement according to claim 1, characterized in that: The light source board (1) adopts an LED light source, and a plurality of LED lamp beads are evenly arranged inside the light source board (1).

5. A dual redundant high-precision coded target for tunnel visual displacement measurement according to claim 4, characterized in that: The LED lamp beads are connected to a circuit control board, and the circuit control board controls the brightness and flickering frequency of the LED lamp beads.

6. The dual redundant high-precision coded target for tunnel visual displacement measurement according to claim 1, characterized in that: The barcode plate (3) contains unique coding information, with a coding rule of one bit at an interval of 3 mm.

7. A dual redundant high-precision coded target for tunnel visual displacement measurement according to any one of claims 1 to 6, characterized in that: The light source plate (1), the circular carbon plate (2) and the bar coding plate (3) are externally packaged and fixed by transparent packaging materials.

8. The dual redundant high-precision coded target for tunnel visual displacement measurement according to claim 7, characterized in that: The packaging material is a resin material with high heat resistance and high UV resistance.

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