LiDAR Ranging System with Movable Mirror for Dynamic Angle Control
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Solution Overview
Problem
LiDAR systems face a trade-off between angle of view and resolution, limiting their ability to accurately detect subjects at long distances while maintaining required resolution, and they struggle to adapt their ranging direction effectively in dynamic environments.
Innovation Solution
A ranging system that includes a LiDAR apparatus with a movable mirror and a control circuit, allowing it to adjust its ranging direction based on external signals, thereby changing the emission timing of laser light to focus on specific areas of interest while maintaining a fixed angle of view, and optionally using a movable mount for further directional control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the angle of view of LiDAR is increased to detect long-distance subjects, then the detection range is improved, but the resolution of distance information deteriorates
Solution Approach 1:
The LiDAR system dynamically changes its angle of view based on detection needs. The control unit adjusts the angle of view to be smaller when high resolution is needed and larger when wide coverage is needed, making the system adaptive rather than static. This resolves the contradiction by allowing the angle of view to vary dynamically rather than being fixed.
Solution Approach 2:
The system changes the parameter of angle of view according to different operational requirements. By controlling the angle of view to be smaller than a reference value when subject detection is prioritized, and larger when coverage is prioritized, the system optimizes performance for different scenarios, resolving the fixed trade-off between range and resolution.
2Measurement precision
If the angle of view is reduced to improve resolution, then the measurement precision is improved, but the detection range and coverage area deteriorate
Solution Approach 1:
The system dynamically adjusts the angle of view parameter based on real-time requirements. When high resolution is needed for subject detection, the angle of view is reduced; when wide area coverage is needed, the angle of view is increased. This dynamic adaptation resolves the contradiction by allowing the system to optimize for either resolution or range depending on operational context.
Solution Approach 2:
The control unit changes the angle of view parameter to match operational needs. By setting the angle of view to be smaller than a reference value when resolution is prioritized and larger when coverage is prioritized, the system flexibly manages the trade-off between precision and detection range.
3Device complexity
If the LiDAR uses a fixed angle of view, then the device complexity is reduced, but the adaptability to dynamic environments deteriorates
Solution Approach 1:
The LiDAR system transitions from a static fixed angle of view to a dynamic adjustable angle of view. The control unit enables real-time modification of the angle of view parameter, allowing the system to adapt to changing environmental requirements while maintaining relatively simple hardware architecture.
Solution Approach 2:
The system introduces the capability to change the angle of view parameter based on operational context. By controlling the angle of view to be smaller or larger than a reference value depending on whether subject detection or coverage is prioritized, the system gains adaptability without requiring complex structural modifications.
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
Enhances detection accuracy for long-distance subjects by optimizing ranging direction and resolution, ensuring required ranging resolution in noted ranges and improving safety in transportation equipment operations by acquiring information in regions inaccessible to cameras.
Implementation Method 1
A LiDAR emits laser light to a ranging target. The emitted laser light is reflected by the ranging target, and detected by an optical sensor of the LiDAR.
Implementation Method 2
measure a distance to the subject based on a timing of emission of the first laser light by the light source and a timing of detection of the second laser light by the light sensor
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
According to one arrangement, a ranging apparatus includes a light source (23), a movable mirror (251), a light sensor (26), a measurement circuit (27), and a first control circuit (21). The movable mirror reflects each of first and second laser lights. The second laser light corresponds to the first laser light reflected by an external subject. The light sensor detects the second laser light reflected by the movable mirror. The measurement circuit measures a distance to the subject based on a timing of emission of the first laser light by the light source and a timing of detection of the second laser light by the light sensor. The first control circuit changes an emission direction of the first laser light based on a first signal from outside.