Vehicle tunnel detection method and device based on direction linear array technology
A detection method and detection device technology, which are applied to measurement devices, optical devices, optical testing of flaws/defects, etc., can solve the problem of dynamic-laser scanning and area array camera sparse sampling detection interval is large, cannot measure small local deformation, Limiting accuracy and other issues to ensure the long-term stability of measurement, real-time disease classification management, and accurate measurement of spatial movement.
Active Publication Date: 2019-11-22
GUANGZHOU AUTO TRANSPORT MEASURE & CONTROL TECH
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Problems solved by technology
[0005] 1. Accuracy - low crack recognition rate and inaccurate measurement of geometric deformation
[0006] 2. Applicability - only meet the detection speed below 20 km / h; the interference of the subway tunnel will not be measured
[0007] 3. Dynamics - laser scanning and area array camera sparse sampling detection interval is large, resulting in missed detection and missed detection
[0008] 4. Comprehensiveness - manual inspection and measurement are still widely used in tunnel settlement measurement
However, the measurement method and sampling line frequency limit the accuracy; small areas are prone to misjudgment and misjudgment; low-speed measurement; poor synchronization of camera sampling leads to difficulty in splicing; unsolved tunnel settlement inspection and measurement
The multi-array camera combined method has high measurement accuracy in theory; the influence of ms-level difference in sampling synchronization will cause stitching problems; the uncertainty of image positioning leads to large calculation errors; the correction method is complicated due to synchronization and positioning uncertainty; only Measurement at low speed; sensor sparse sampling 30-50 frames / s cannot measure small local deformation
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[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.
[0032] In the following examples, figure 1 The coordinate system definition of adopts the right-hand coordinate system, and the parameters are defined as follows:
[0033] The x-axis pointing to the inside of the page is positive, indicating the traveling direction of the car body; the x-axis rotates 90° clockwise; it is defined as the positive direction of the y-axis; the y-axis rotates 90° clockwise; it is defined as the positive direction of the z-axis; the angle φ represents the heading deviation Angle, the positive value turns from the x-axis direction to the y-axis direction, that is, deflects to the right; the angle θ represents the rolling deflection angle, and the positiv...
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Abstract
The invention discloses a vehicle tunnel detection method and device based on a direction linear array technology. The method comprises the following steps: constructing a 24-phase circular directionlinear array vector measurement coordinate system; constructing a motion direction circular scale and a multi-view image dynamic correction method; carrying out pixel-level speed matching sampling line frequency and pixel equivalent compensation; and correcting the three-dimensional motion coordinates of a detection frame relative to the horizontal plane of a track. The invention covers the measurement of tunnel settlement, section, crack, leakage, tunnel gauge and other diseases. The vehicle tunnel detection method based on a direction linear array technology has the advantages of high accuracy, strong applicability, good dynamic performance and good comprehensiveness.
Description
technical field [0001] The invention relates to the field of tunnel safety detection, and relates to a vehicle-mounted tunnel detection method and device based on directional line array technology. Background technique [0002] Tunnels are an important infrastructure in the railway and subway industries. The number of kilometers of tunnel construction in my country has ranked first in the world, whether it is railways or subways. The railway tunnel disease is directly related to the safety of railway transportation. According to incomplete statistics, as of the end of 2009, the total length of railway tunnels built in my country exceeded 7,000 km, and the total length planned to be constructed before 2020 exceeded 9,000 km. Under the joint action of long-term line load vibration, geology, hydrology, etc., the surrounding rock of the operating tunnel will have tunnel diseases, and the diseases affecting the operation account for about 30% of the total number of tunnels. Urb...
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IPC IPC(8): G01B11/16G01N21/88
CPCG01B11/16G01N21/8851
Inventor 邹至刚
Owner GUANGZHOU AUTO TRANSPORT MEASURE & CONTROL TECH