Planar-Beam LiDAR Architecture for Low-Complexity High-Speed Detection
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Solution Overview
Problem
Current LIDAR systems for autonomous vehicles require numerous fixed beams to achieve safe operation at high speeds, leading to increased costs, power consumption, and complexity, which are unsustainable for widespread adoption.
Innovation Solution
A planar-beam LIDAR system that uses a single laser scanner emitting a two-dimensional beam plane and a detector array to reduce the number of beams needed, utilizing a fiber laser and adjustable photodetectors to maintain data quality while minimizing pulse rate and equipment requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of laser beams is increased to achieve safe operation at high speeds, then the detection precision and safety are improved, but the cost, device complexity, and power consumption increase significantly
Solution Approach 1:
The patent transforms the traditional one-dimensional array of fixed laser beams into a two-dimensional planar beam structure. By using a single laser scanner with cylindrical lenses to generate a plane of light that sweeps across the field of view, the system achieves comprehensive spatial coverage without requiring multiple independent beam sources, thereby reducing device complexity while maintaining detection precision.
Solution Approach 2:
The single laser scanner is designed to perform multiple functions: it generates the planar beam, controls the sweeping motion, and provides comprehensive spatial coverage that would otherwise require multiple dedicated beam sources. This multi-functional approach reduces the overall number of components and simplifies the system architecture.
2Measurement precision
If the number of laser beams is increased to achieve safe operation at high speeds, then the detection precision and safety are improved, but the power consumption increases significantly
Solution Approach 1:
The patent combines multiple beam-generation functions into a single laser scanner unit. Instead of powering multiple independent laser sources, one scanner generates a planar beam that covers the entire field of view through its sweeping motion, significantly reducing the total power consumption while maintaining the detection precision needed for high-speed operation.
Solution Approach 2:
By transitioning from multiple one-dimensional beams to a single two-dimensional planar beam, the system reduces the number of active laser sources from many to one, thereby dramatically lowering power consumption while preserving comprehensive spatial detection capability.
3Measurement precision
If the number of photodetectors is increased to match the increased beam count, then the detection precision is improved, but the cost and device complexity increase
Solution Approach 1:
The patent employs a two-dimensional array of photodetectors that simultaneously captures reflected light from the entire planar beam across the field of view. This 2D detection plane provides comprehensive spatial resolution without requiring a proportional increase in the number of detectors compared to traditional multi-beam systems, as each detector element captures information from its corresponding spatial position across the plane.
Solution Approach 2:
The system performs preliminary spatial encoding by organizing photodetectors in a 2D array that corresponds to the planar beam geometry. This pre-arranged spatial mapping allows the system to capture comprehensive spatial information with a manageable number of detectors, avoiding the need for excessive detector counts while maintaining detection precision.
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 planar-beam LIDAR system reduces the number of beams required by 100 times, maintaining data quality while decreasing costs, complexity, and power consumption, making it more feasible for autonomous vehicle applications.
Implementation Method 1
A planar-beam LIDAR system includes a laser scanner that emits a planar-beam
Implementation Method 2
a detector array to detect reflected light (e.g., backscatter) from the planar beam
Data Source
AI summary
A planar-beam, light detection and ranging (PLADAR) system can include a laser to output a laser beam and a collimator configured to collimate the laser beam axially to emit a planar beam from the laser. The PLADAR system can further include a detector to detect reflected light based on the planar beam being reflected from external surfaces of target objects.