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An Underwater High-Precision Measurement and Defect Detection Method Fusion of Acoustic and Optical Methods

An optical method and defect detection technology, which is applied in the direction of optical defect/defect detection, measuring device, sound wave re-radiation, etc., can solve the problems of sonar technology measurement resolution limitation, incompetence for underwater fine structure detection tasks, etc., and achieve improvement The effect of precision

Active Publication Date: 2022-06-17
SOUTHEAST UNIV
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Problems solved by technology

However, the measurement resolution of sonar technology has certain limitations, and it is not suitable for the detection of underwater fine structures, such as the detection of local defects of dams and bridge piers.

Method used

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  • An Underwater High-Precision Measurement and Defect Detection Method Fusion of Acoustic and Optical Methods
  • An Underwater High-Precision Measurement and Defect Detection Method Fusion of Acoustic and Optical Methods
  • An Underwater High-Precision Measurement and Defect Detection Method Fusion of Acoustic and Optical Methods

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with specific implementation cases.

[0022] (1) Install a three-dimensional sonar measurement device, GPS, and inertial guidance unit on the movable underwater measurement platform. An optical 3D topography measurement system based on a dual-camera 3D digital speckle correlation method consisting of a projector and two near-infrared cameras is installed on the underwater measurement platform, in which each camera is individually packaged in a flat, transparent in the waterproof housing of the viewing window.

[0023] (2) Select a position on the underwater surface to be measured as the initial position, and place the measurement platform in the initial position. Use the optical three-dimensional topography measuring device on the measuring platform to obtain the local optical three-dimensional topography point cloud of the measured surface within the preset distance range from the initial position; ...

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Abstract

The invention provides an underwater high-precision measurement and defect detection method that combines acoustic and optical methods, which can obtain multi-scale acousto-optic fusion three-dimensional shape point clouds of underwater structures, so as to better detect damage to underwater structures, Defects and other information. The method mainly includes the following steps: (1) installing a navigation device, an optical three-dimensional shape measuring device, and a three-dimensional sonar measuring device on an underwater measuring platform. (2) Using the optical three-dimensional shape measurement device to obtain the point cloud data of the overall optical three-dimensional shape of the measured surface. (3) Use 3D sonar to obtain the point cloud data of the overall acoustic 3D shape of the underwater measured surface. (4) The point cloud data of the overall acoustic and optical three-dimensional topography of the measured surface are fused to realize high-precision measurement of the three-dimensional topography of underwater structures. (5) Based on acoustic and optical fusion of 3D topography point cloud data, deep learning algorithms are used to realize automatic positioning of underwater defects.

Description

technical field [0001] The invention relates to the field of underwater high-precision measurement, in particular to an underwater high-precision measurement and defect detection method integrating acoustic and optical methods. Background technique [0002] The underwater three-dimensional sonar system transmits dense beams and obtains echoes from the surface of the target object, and then converts them into electrical signals for processing to obtain high-density point cloud data on the surface of the object. It is widely used in underwater structure detection and other aspects. It has the characteristics of being suitable for complex underwater environment, high precision, wide measurement range and fast measurement speed. However, the measurement resolution of sonar technology has certain limitations, and it cannot be used for the detection of underwater fine structures, such as the detection of local defects in dams and bridge piers. [0003] Optical-based 3D topograph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/25G01N21/95G01N29/04G01S15/86G01S15/89G06T7/00
CPCG01B11/25G01S15/89G01S15/86G01N29/04G01N21/95G06T7/0002Y02A90/30
Inventor 邵新星谷柳凝侯士通吴刚何小元
Owner SOUTHEAST UNIV
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