Laser Scanner Optical Axis Deflection for Targeted Ridge Extraction
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Solution Overview
Problem
Conventional laser scanners face challenges in efficiently extracting ridge lines and intersection points within a specific measurement range, requiring extensive data acquisition and processing time, especially when scanning the interior of structures like buildings, which results in time-consuming verification processes against design drawings.
Innovation Solution
A laser scanner with a rotatable scanner unit, optical axis deflecting mechanism using optical prisms, and advanced control components that allow precise scanning and data extraction based on design drawing data, enabling the acquisition of scanning data within a predetermined range and facilitating the extraction of actual ridge lines and intersection points without needing 360° data acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a mirror is horizontally rotated by approximately 180° while the mirror is rotated vertically to acquire point cloud data of a total circumference of 360°, then the measurement range is improved, but the quantity of data acquired increases enormously and extraction time increases
Solution Approach 1:
The patent extracts and focuses only on the necessary measurement range by using design drawing data to identify specific regions of interest. Instead of acquiring 360° point cloud data, the system extracts and processes only the data within the predetermined measurement range, thereby reducing the quantity of data while maintaining complete measurement coverage of the required area.
2Area of stationary object
If a mirror is horizontally rotated by approximately 180° while the mirror is rotated vertically to acquire point cloud data of a total circumference of 360°, then the measurement range is improved, but the time to extract necessary straight lines, points, and curves increases
Solution Approach 1:
The system extracts and processes only the necessary data within the predetermined measurement range identified from design drawing data. By excluding unnecessary data acquisition from areas outside the measurement range, the extraction time for straight lines, points, and curves is significantly reduced while maintaining complete coverage of the required measurement area.
Solution Approach 2:
The patent performs preliminary action by using design drawing data to predeterminedly determine the measurement range before actual scanning. This allows the system to pre-identify regions of interest and focus data acquisition only on those areas, thereby reducing subsequent extraction time without compromising measurement completeness.
3Area of stationary object
If point cloud data of a total circumference of 360° is acquired to enable checking of construction processes, then the measurement range is improved, but the checking operation after each process requires more time
Solution Approach 1:
The system extracts and processes only the data within the predetermined measurement range that is relevant to construction checking. By using design drawing data to identify specific regions requiring verification, the system reduces the checking time while maintaining complete coverage of all areas that need to be verified against the construction design.
Solution Approach 2:
The patent performs preliminary action by predeterminedly determining the measurement range based on design drawing data before construction checking. This allows the system to pre-identify which areas require verification, thereby reducing the time needed for construction process checking while ensuring all necessary areas are covered.
4Device complexity
If a conventional laser scanner uses a rotating mirror to scan the object, then the device complexity is reduced, but the ability to locally scan an arbitrary range or an arbitrary portion is limited
Solution Approach 1:
The patent implements dynamic control of the optical axis deflecting unit, which can change its deflection state based on the predetermined measurement range. The unit can dynamically adjust between different deflection angles to target specific regions of interest identified from design drawing data, thereby providing local scanning capability while maintaining relatively simple scanner structure.
Solution Approach 2:
The system changes the operating parameters of the optical axis deflecting unit by adjusting its deflection angle according to the predetermined measurement range. This allows the scanner to adapt to different local scanning requirements without changing the basic scanner structure, thereby improving versatility while keeping device complexity manageable.
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 solution reduces the time and data required for extracting ridge lines and intersection points, streamlining the verification process and improving the efficiency of construction checks by allowing targeted scanning and comparison with design data.
Implementation Method 1
the optical axis deflecting unit comprises a pair of optical prisms which enables to rotate with the distance measuring optical axis as a center
Implementation Method 2
a photodetector for receiving the reflected distance measuring light and producing a light receiving signal
Data Source
AI summary
A laser scanner comprises a scanner main unit, wherein the scanner main unit has a distance measuring light projecting component for projecting a distance measuring light, a light receiving component for receiving a reflected distance measuring light, a distance measuring component for performing a distance measurement based on a light receiving signal from the light receiving component, an optical axis deflecting unit for deflecting a distance measuring optical axis, a projecting direction detecting unit for detecting a deflection angle of the distance measuring optical axis, a storage component which stores three-dimensional design drawing data of an object to be measured and a control component for controlling the optical axis deflecting unit and the distance measuring component, wherein the control component acquires scanning data by scanning a measurement range and extracts an actual ridge line or an actual intersection point of the object to be measured based on the scanning data.