Multi-Emitter LiDAR Layout for Overlapping Field-of-View Coverage
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Solution Overview
Problem
Flash LiDAR systems have limited angles of view, resulting in detection blind areas and insufficient detection distances, and increasing power consumption and costs when trying to enhance detection range, while off-axis systems suffer from pixel shifting and lack of point clouds in the central field of view.
Innovation Solution
A LiDAR design with multiple emission and receiving devices, where each emission device emits laser beams to overlapping subregions, and each receiving device corresponds to a specific subregion, with a control mechanism to prevent crosstalk, ensuring even light distribution and maintaining point clouds in the central field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the transmission power is significantly increased to increase detection distance, then detection distance is improved, but power consumption and thermal effect are greatly increased
Solution Approach 1:
The patent divides the field of view into multiple subregions and uses multiple emission devices to detect different subregions simultaneously. This segmentation allows the system to achieve long detection distance in specific directions without increasing overall transmission power, as each emission device operates at lower power while collectively covering the entire field of view.
Solution Approach 2:
The patent implements local quality by directing laser beams to specific subregions rather than uniformly illuminating the entire field of view. Each emission device targets specific angular ranges, allowing optimized power distribution across different spatial zones. This enables extended detection distance in critical areas while maintaining lower overall power consumption.
2Power
If the size of emission chip is increased to increase emission power, then emission power is improved, but it becomes more difficult to drive related hardware and causes inconsistency of uniformity of emitted light
Solution Approach 1:
The patent segments the emission function across multiple smaller emission devices rather than using one large emission chip. Each emission device has manageable size and power requirements, making hardware driving simpler. The collective arrangement of multiple segmented devices achieves the required total emission power while maintaining uniformity and simplifying control electronics.
3Area of stationary object
If off-axis system is designed to reduce costs and size, then device size and cost are improved, but pixels are shifted and there is no point clouds in middle field of view
Solution Approach 1:
The patent segments the field of view into multiple subregions and assigns different emission devices to different subregions. By carefully designing the angular ranges and overlapping regions of these subregions, the system ensures complete coverage of the middle field of view without pixel shifting gaps. This segmented approach maintains the compact off-axis configuration while eliminating detection blind spots.
Solution Approach 2:
The patent combines multiple emission devices with overlapping detection subregions to ensure complete coverage of the field of view, particularly the middle region. The overlapping design of adjacent subregions guarantees that no area is missed due to pixel shifting, effectively merging the detection capabilities of individual devices into a comprehensive system that eliminates blind spots while maintaining compact size.
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 design reduces detection blind spots, enhances energy utilization, and maintains point clouds in the central field of view, while minimizing the size and cost of the emission modules, improving obstacle avoidance capabilities.
Implementation Method 1
a laser emission device, arranged in the emission chamber and configured to emit a laser beam to a first target region
Implementation Method 2
the plurality of laser receiving devices can receive the laser beam reflected from a second target region
Data Source
AI summary
This application discloses a LiDAR and a device. The LiDAR includes: a receiving module and a plurality of emission modules, and a combination of emission fields of view of the plurality of emission modules matches the receiving field of view of the receiving module. Each emission module includes a laser and an emission optical component located on a light emission side of the laser. An area of a projection region of a light emission region of the laser of the emission module on a light-incident face of the emission optical component is smaller than an area of the light-incident face. Emission angles of view of the plurality of emission modules are overlapped.