Laser Scanning Data Processing for Tunnel Cross-Sections
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Solution Overview
Problem
Current methods of laser scanning in tunneling work are time-consuming and generate a large amount of data, particularly when scanning the entire inner wall of a tunnel to obtain a cross-sectional shape.
Innovation Solution
A technique that involves a laser scanning data processing device and method to acquire and process data by calculating a straight line connecting the right and left wall surfaces of a tunnel at the shortest distance or perpendicular to them, allowing for reduced scanning while obtaining essential cross-sectional data, using a laser scanning apparatus with horizontal and vertical rotation units and an optical unit to emit and receive laser scanning light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laser scanning is performed on the entire inner wall of a tunnel to obtain cross-sectional shape, then measurement completeness is improved, but scanning time increases and data volume becomes large
Solution Approach 1:
The patent extracts only the essential wall surface data needed for cross-sectional shape measurement by calculating straight lines connecting right and left wall surfaces. Instead of processing all laser scanning points, the system identifies and extracts only the critical points on wall surfaces, thereby reducing data volume and processing time while maintaining measurement accuracy for cross-sectional shape.
Solution Approach 2:
The patent creates simplified representations (copies) of the tunnel wall surfaces by fitting straight lines to laser scanning points. These line representations serve as simplified copies that capture the essential geometric information needed for cross-sectional analysis, replacing the need to process the complete point cloud data while preserving measurement accuracy.
2Measurement precision
If laser scanning is performed on the entire inner wall of a tunnel to obtain cross-sectional shape, then measurement completeness is improved, but data volume becomes large
Solution Approach 1:
The patent extracts only the essential wall surface data needed for cross-sectional shape measurement by calculating straight lines connecting right and left wall surfaces. Instead of processing all laser scanning points, the system identifies and extracts only the critical points on wall surfaces, thereby reducing data volume and processing time while maintaining measurement accuracy for cross-sectional shape.
Solution Approach 2:
The patent creates simplified representations (copies) of the tunnel wall surfaces by fitting straight lines to laser scanning points. These line representations serve as simplified copies that capture the essential geometric information needed for cross-sectional analysis, replacing the need to process the complete point cloud data while preserving measurement accuracy.
3Loss of information
If conventional laser scanning methods are used to scan tunnel inner walls, then comprehensive data is obtained, but processing efficiency decreases
Solution Approach 1:
The patent extracts only the essential wall surface data needed for cross-sectional shape measurement by calculating straight lines connecting right and left wall surfaces. Instead of processing all laser scanning points, the system identifies and extracts only the critical points on wall surfaces, thereby reducing data volume and processing time while maintaining measurement accuracy for cross-sectional shape.
Solution Approach 2:
The patent creates simplified representations (copies) of the tunnel wall surfaces by fitting straight lines to laser scanning points. These line representations serve as simplified copies that capture the essential geometric information needed for cross-sectional analysis, replacing the need to process the complete point cloud data while preserving measurement accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the amount of scanning required, enabling efficient acquisition of tunnel cross-sectional data while maintaining accuracy, allowing for faster data processing and reduced data volume.
Implementation Method 1
an optical unit disposed on the vertical rotation unit and configured to emit and receive laser scanning light
Implementation Method 2
emit and receive laser scanning light
Data Source
AI summary
Laser scanning is performed along a transverse section of a tunnel while the amount of scanning is reduced as much as possible. A laser scanning apparatus includes a horizontal rotation unit, a vertical rotation unit disposed on the horizontal rotation unit, and an optical unit disposed on the vertical rotation unit and configured to emit and receive laser scanning light. A method includes obtaining laser scanning data of right and left wall surfaces of a tunnel, calculating a straight line that connects the right and left wall surfaces and that crosses a perpendicular line passing a position at which the laser scanning apparatus is set up, and calculating a direction orthogonal to the straight line in a horizontal plane, and performing laser scanning of a transverse section of the tunnel while the vertical rotation unit is rotated around a rotation axis in the calculated direction.