Laser Scanner Calibration Target with High Reflectance Sector
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Solution Overview
Problem
Current laser scanner systems face challenges in identifying measured points and calibrating data accurately due to manufacturing errors, mounting issues, and environmental changes such as temperature variations, making it difficult to verify the accuracy of three-dimensional data collected in urban environments.
Innovation Solution
A laser scanner system equipped with a pulsed laser beam emitting element, a rotary projecting unit, and a distance measuring unit, along with a calibration target having a reflection sector with a known shape and high reflectance, allows for easy identification and calibration by detecting the level of light quantity of the reflected pulsed laser beam to determine the center position of the calibration target, enabling precise measurement and data association.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a laser scanner is used to acquire three-dimensional data, then a large amount of point group data can be collected efficiently, but it becomes very difficult to identify the measured points and verify measurement accuracy
Solution Approach 1:
The patent applies visual differentiation by assigning different colors to different measured points or groups of points. This allows operators to easily identify and distinguish between various measured points in the point cloud data, resolving the difficulty of point identification while maintaining efficient data collection capabilities
Solution Approach 2:
The patent introduces an image processing unit that acts as an intermediary between the laser scanner and the operator. This unit processes the raw point group data and generates visual representations with color coding, making it easier to identify and verify measured points without reducing the efficiency of data acquisition
2Ease of manufacture
If manufacturing processes and mounting procedures are used to assemble the laser scanner system, then the system can be constructed, but individual differences and measurement errors occur due to manufacturing errors and environmental changes
Solution Approach 1:
The patent implements a calibration process that is performed before actual measurements to compensate for manufacturing errors and mounting variations. By pre-calibrating the system using known reference targets, the measurement accuracy is improved while the system remains easy to manufacture and assemble
Solution Approach 2:
The patent employs feedback mechanisms where measurement data is continuously verified and corrected based on known reference information. This feedback loop allows the system to compensate for individual differences caused by manufacturing and mounting variations, maintaining high measurement precision
3Device complexity
If conventional laser scanner systems are used without specialized calibration targets, then the system structure remains simple, but it becomes very difficult to verify measured data and check system accuracy during measurement operations
Solution Approach 1:
The patent introduces calibration targets with known geometric features as intermediaries between the laser scanner and the verification process. These targets provide reference points that enable easy verification of measurement accuracy without significantly complicating the overall system structure
Solution Approach 2:
The calibration targets are designed to be self-identifying through their unique geometric patterns and known positions. The system automatically detects these targets and performs verification without requiring complex external equipment or procedures, maintaining system simplicity while enabling reliable measurement verification
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 simplifies the identification of measured points and calibration of the laser scanner system, allowing for accurate determination of object positions and data verification, even in challenging environmental conditions, and enables measurement on specific points that conventional systems cannot access.
Implementation Method 1
a distance measuring unit, which has a distance measuring light receiving unit, for measuring a distance by receiving a reflection light from an object to be measured
Implementation Method 2
a light emitting element for emitting a pulsed laser beam, a rotary projecting unit for projecting the pulsed laser beam for scanning
Data Source
AI summary
A laser scanner measuring system is disclosed, which has a laser scanner and a calibration target. The laser scanner comprises a light emitting element for emitting a pulsed laser beam, a rotary projecting unit for projecting the pulsed laser beam, a distance measuring unit, and a control unit for driving and controlling the light emitting element and the distance measuring unit. The calibration target has a reflection sector with a known shape and with high reflectance and is installed at a known position. In use, there is a step for judging a reflected pulsed laser beam from the reflection sector by detecting a level of light quantity, a step for determining a center position of the reflection sector based on the result of the judgment, and a step for calibrating the laser scanner measuring system based on the determined center position and on the known position.