Near-Field LiDAR Optical Path for Vehicle Blind Spot Detection
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Solution Overview
Problem
Current LiDAR systems are inadequate for effective blind spot detection in autonomous vehicles, particularly in near-field scenarios, as they struggle to accurately detect objects close to the vehicle using traditional light detection and ranging technologies.
Innovation Solution
A short-range LiDAR system is developed, comprising a light source, emitting lens, optical element, and collection lens, where the optical element, such as a mirror with a rotational axis, redirects and focuses scattered light onto a detector, enabling precise detection of near-field objects. The system includes a processor to determine object distance and rotating speed based on detection rates and field of view, utilizing photodiodes or avalanche photodiodes for accurate signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional LiDAR systems are used for blind spot detection, then the system can detect distant objects, but it fails to accurately detect near-field objects
Solution Approach 1:
The patent divides the detection space into near-field and far-field regions, using specialized optical paths for each. The near-field detection uses a separate optical element and detector configuration optimized for short distances, while far-field detection uses the traditional LiDAR path, allowing each segment to be optimized for its specific detection requirements
Solution Approach 2:
The patent introduces a beam splitter as an intermediary optical element that separates the detection paths for near-field and far-field objects. This beam splitter directs near-field reflected light to a dedicated near-field detector while allowing far-field light to reach the main detector, enabling simultaneous accurate detection in both ranges without interference
2Area of stationary object
If multiple light detectors are arranged into arrays to detect light over substantial geometric area, then the detection area increases, but the system complexity increases
Solution Approach 1:
The patent combines the near-field detection optical path with the existing far-field LiDAR system through a beam splitter, rather than completely separate systems. This merging approach allows the near-field detector array to be integrated into the existing platform, sharing common components like the light source and processing electronics, thereby reducing overall system complexity while maintaining large detection area capability
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 effectively detects objects within a few inches of the vehicle, enhancing safety by providing accurate navigation and collision avoidance capabilities for autonomous vehicles, with the ability to deploy multiple systems around the vehicle for comprehensive blind spot detection.
Implementation Method 1
The light source emits light towards a target which then scatters the light. Some of the scattered light is received back at the detector.
Implementation Method 2
The system determines the distance to the target based on the time of flight of the returned light.
Implementation Method 3
The emitting lens is positioned to obtain the emitted light and configured to produce a shaped beam.
Implementation Method 4
The collection lens is configured to focus the at least the portion of the scattered light on a light detector
Implementation Method 5
Light detectors, such as photodiodes, avalanche photo diodes (APDs), can be used to detect light that is imparted on their surfaces by, for example outputting an electrical signal, such as a voltage or a current, that corresponds to an intensity of light.
Data Source
AI summary
A system is presented in accordance with aspects of the present disclosure. In various embodiments, the system includes a light source configured to emit light, an emitting lens positioned to obtain the emitted light and configured to produce a shaped beam, an optical element positioned to obtain the shaped beam and redirect the shaped beam toward a near field object to produce scattered light from the near field object, and to obtain and redirect at least a portion of the scattered light, and a collection lens configured to focus the at least the portion of the scattered light on a light detector.