Mobile 3D Survey Scanner for Low-Illuminance Data Capture
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Solution Overview
Problem
Existing three-dimensional survey systems face data omission issues due to insufficient illuminance, which affects the accuracy of the three-dimensional maps generated during photographic surveys.
Innovation Solution
A survey system incorporating a mobile body equipped with a scanner featuring an emitting unit, a light receiving unit, optical axis deflecting units, and a posture detecting device, such as an inertial measurement unit or camera, to perform precise distance measurements and posture detection, ensuring accurate three-dimensional data acquisition regardless of illuminance levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a camera-based photographic survey is used, then the survey system can capture visual information, but data omission occurs when illuminance is insufficient
Solution Approach 1:
The patent segments the survey system into two independent data collection paths: a camera for visual information and a laser scanner for geometric data. This segmentation allows the system to compensate for the camera's weakness in low illuminance conditions by relying on the laser scanner's active illumination capability, thereby preventing data omission.
Solution Approach 2:
The laser scanner acts as an intermediary that provides active illumination through its emitting unit, enabling distance measurements independent of ambient light conditions. This intermediary component bridges the gap caused by insufficient illuminance, ensuring continuous data acquisition.
2Reliability
If a laser scanner is used for distance measurement, then distance data can be acquired independently of illuminance, but the system complexity increases due to additional optical components
Solution Approach 1:
The patent merges the camera and laser scanner into a single integrated survey system with a shared control unit and synchronized data processing. This merging reduces overall system complexity by coordinating the two components rather than operating them as separate systems, while maintaining the reliability benefits of illuminance-independent measurement.
Solution Approach 2:
The control unit serves multiple functions: it coordinates the camera operation, controls the laser scanner emitting unit, processes data from both sensors, and manages the synchronization between different measurement modes. This multi-functionality reduces the need for separate control systems, thereby managing complexity.
3Measurement precision
If optical axis deflecting units are added to enable precise scanning control, then measurement precision improves, but the device complexity increases
Solution Approach 1:
The patent employs dynamic optical axis deflecting units that can adjust their deflection angles in real-time based on the scanning requirements. This dynamic capability allows precise control of the laser beam direction without requiring a fixed complex optical structure, achieving high measurement precision with adaptable complexity.
Solution Approach 2:
The optical axis deflecting units change the deflection angle parameter dynamically during scanning operations. By varying this parameter according to the scanning pattern requirements, the system achieves precise measurement control while maintaining a relatively simple base optical structure that doesn't require complex mechanical arrangements.
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
The system effectively reduces data omission and enhances the accuracy of three-dimensional surveys by enabling precise distance measurements and posture detection, allowing for comprehensive data collection including both upper and side surfaces of structures.
Implementation Method 1
an emitting unit configured to emit a distance measuring light
Implementation Method 2
a light receiving unit configured to receive a reflected distance measuring light
Implementation Method 3
a first optical axis deflecting unit disposed on an optical axis of the distance measuring light and configured to deflect the distance measuring light
Data Source
AI summary
Provided is a survey system capable of more highly accurately obtaining a product of a three-dimensional survey. A survey system includes a mobile body, a scanner including an emitting unit, a light receiving unit, a distance measuring unit, a first optical axis deflecting unit disposed on an optical axis of the distance measuring light and configured to deflect a distance measuring light, a second optical axis deflecting unit disposed on a light receiving optical axis of the reflected distance measuring light and configured to deflect a reflected distance measuring light at the same angle in the same direction as those of the first optical axis deflecting unit, and an emitting direction detecting unit to detect deflection angles and directions of the first and the second optical axis deflecting units, a posture detecting device of the scanner, and a position measuring device of the scanner.