Dual-Rotatable Mirror LiDAR Scanning for Dense Wide-Aperture Detection
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Solution Overview
Problem
LiDAR systems have limited apertures for collecting returning light pulses, leading to incomplete scanning and potential collisions due to undetected objects in the field-of-view.
Innovation Solution
A LiDAR scanning system with a beam steering apparatus using two rotatable mirrors configured at angles greater than zero degrees and less than 90 degrees, allowing for increased aperture and overlapping scanning to enhance detection capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a LiDAR system uses a limited aperture for collecting returning light pulses, then the device complexity is reduced, but the scanning range and detection completeness deteriorate
Solution Approach 1:
The patent divides the aperture into multiple segments by using multiple light detectors arranged in an array. Each detector element acts as an independent sampling point across the aperture area, allowing the system to achieve a large effective aperture without requiring a single complex large-aperture collector. This segmentation enables parallel processing of light pulses across multiple detectors.
Solution Approach 2:
The patent transitions from a single-aperture collection system to a multi-detector array system, adding the dimension of spatial distribution across multiple detection points. This dimensional expansion allows the system to capture returning light pulses from across the entire field-of-view simultaneously, effectively increasing the aperture area without proportionally increasing mechanical complexity.
2Measurement precision
If a LiDAR system uses a limited aperture for collecting returning light pulses, then the device complexity is reduced, but the scanning density and resolution deteriorate
Solution Approach 1:
The aperture is segmented into multiple detection elements arranged in an array, with each element contributing to the overall scanning density. This segmentation allows the system to achieve high scanning density by combining the measurements from multiple detectors, effectively increasing the number of sampling points without requiring a single complex high-density detector.
Solution Approach 2:
The patent merges the data from multiple light detectors to achieve high scanning density. By combining the measurements from all detectors in the array, the system reconstructs a high-resolution point cloud that would be impossible to achieve with a single detector, thus achieving high scanning density through aggregation of multiple simpler detection elements.
3Reliability
If a LiDAR system uses a limited aperture for collecting returning light pulses, then the device complexity is reduced, but the reliability and detection completeness deteriorate
Solution Approach 1:
The detection system is segmented into multiple independent detector elements distributed across the aperture. This segmentation ensures that returning light pulses from different locations in the field-of-view can be detected by different detector elements, improving detection completeness. Even if one detector fails, others can still detect objects, thereby improving system reliability.
Solution Approach 2:
Each detector element in the array has a specific local field-of-view and detection responsibility zone. This local quality assignment ensures that different regions of the field-of-view are monitored by appropriate detectors, improving overall detection completeness. The system can identify which detector detected which returning light pulses, enabling better spatial mapping and reliability assessment.
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 improves scanning range and density, providing high-resolution images and reducing the likelihood of collisions by ensuring comprehensive object detection.
Implementation Method 1
A light source configured to generate one or more light beams
Implementation Method 2
a beam steering apparatus optically coupled to the light source. The beam steering apparatus includes a first rotatable mirror and a second rotatable mirror
Data Source
AI summary
The present disclosure describes a system and method for LiDAR scanning. The system includes a light source configured to generate one or more light beams; and a beam steering apparatus optically coupled to the light source. The beam steering apparatus includes a first rotatable mirror and a second rotatable mirror. The first rotatable mirror and the second rotatable mirror, when moving with respect to each other, are configured to: steer the one or more light beams both vertically and horizontally to illuminate an object within a field-of-view; redirect one or more returning light pulses generated based on the illumination of the object; and a receiving optical system configured to receive the redirected returning light pulses.


