Irregular LiDAR Mirror for Variable Resolution Scanning
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Solution Overview
Problem
Conventional LiDARs using rotating mirrors struggle to achieve a small scanning range with high resolution for distant objects, as they are limited by the use of regularly-shaped multi-sided mirrors, which make it difficult to densify the target detection field of view effectively.
Innovation Solution
The implementation of an irregularly-shaped multi-sided rotating mirror with unequal divergence angles for its scanning surfaces allows for a densified target detection field of view, enabling a large field of view and low resolution for short-distance objects while achieving a small field of view and high resolution for long-distance objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a regularly-shaped multi-sided rotating mirror is used for scanning, then the LiDAR can achieve a simple structure and ease of manufacture, but it cannot densify the target detection field of view to achieve high resolution for distant objects
Solution Approach 1:
The patent applies asymmetry by designing the rotating mirror with irregularly-shaped scanning surfaces where at least two adjacent surfaces have different divergence angles. This asymmetric design allows different regions of the detection field of view to have different resolution characteristics, enabling high resolution for distant objects in specific directions while maintaining a simpler overall structure compared to uniformly high-resolution designs.
2Measurement precision
If an irregularly-shaped multi-sided rotating mirror is used to densify the target detection field of view, then high resolution for long-distance objects is achieved, but the manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by making different scanning surfaces of the rotating mirror have different local properties (different divergence angles). Specifically, at least two adjacent scanning surfaces are designed with different divergence angles relative to the center of the rotating mirror, allowing each surface to be optimized for specific regions of the detection field of view. This enables high detection resolution for distant objects in target directions while keeping other regions with simpler characteristics, thus balancing manufacturing ease with performance.
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 effectively enhances the LiDAR's ability to detect objects at varying distances with improved resolution and field of view, addressing the limitations of conventional LiDARs by using an irregularly-shaped rotating mirror to densify the target detection field.
Implementation Method 1
a scanning apparatus, configured to receive the detection laser beam and emit the detection laser beam to a detection field of view, where the scanning apparatus is also configured to receive an echo laser beam and deflect the echo laser beam to a receiving apparatus
Data Source
AI summary
This application discloses a LiDAR, where the LiDAR includes: an emission apparatus, configured to emit a detection laser beam; a scanning apparatus, configured to receive the detection laser beam and emit the detection laser beam to a detection field of view, and to receive an echo laser beam and deflect the echo laser beam to the receiving apparatus; and a receiving apparatus, configured to receive the echo laser beam.