LiDAR Receiver Lens Assembly for External Light Noise Suppression
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Solution Overview
Problem
Existing LiDAR devices face challenges in increasing measuring distance and improving accuracy due to noise caused by external light.
Innovation Solution
A lens assembly for LiDAR devices is designed to distribute multiple lasers to different detectors while reducing noise from external light. This assembly includes a filter layer and multiple lens layers, with specific angular and wavelength-dependent designs to manage light incidence and transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a filter layer is added to reduce external light noise, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The filter layer is integrated within the lens assembly structure, nested between the objective lens and detector layers. This nesting approach allows the filter functionality to be incorporated without adding a separate external component, thus improving measurement accuracy while minimizing the increase in device complexity.
Solution Approach 2:
The lens assembly employs a composite multi-layer structure combining different optical materials with specific properties. The filter layer is designed with wavelength-selective properties that allow it to block external light noise while transmitting the laser wavelength, creating a composite optical system that achieves both noise reduction and maintained transmission efficiency.
2Adaptability or versatility
If multiple lens layers are used to distribute lasers to different detectors, then functionality is improved, but manufacturing difficulty increases
Solution Approach 1:
The lens assembly is divided into multiple functional layers: an objective lens layer for light collection, a filter layer for wavelength selection, and a detector layer with multiple detectors for spatial distribution. This segmentation allows each layer to be optimized independently for its specific function, improving overall functionality while enabling modular manufacturing approaches.
Solution Approach 2:
The multi-layer lens assembly structure serves multiple functions simultaneously: the objective lens collects and focuses light, the filter layer selects specific wavelengths, and the detector layer distributes light to multiple detectors for spatial resolution. This multi-functionality is achieved through a single integrated assembly that can be manufactured as a unified component, reducing the need for multiple separate adjustments and alignments.
3Adaptability or versatility
If the filter layer bandwidth is increased to cover multiple wavelengths, then adaptability is improved, but noise from external light increases
Solution Approach 1:
The filter layer is designed with different transmission characteristics for different wavelength ranges. It has high transmission for the laser wavelength (signal) and high attenuation for external light wavelengths (noise). This local quality differentiation allows the filter to be selective, providing adaptability for detecting laser signals while simultaneously blocking external light noise through wavelength-specific properties.
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 proposed solution effectively reduces noise from external light, allowing for increased measuring distance and improved accuracy in LiDAR devices.
Implementation Method 1
the filter layer is designed to have a first central wavelength for a light incident on the filter layer at the (0) degree, a second central wavelength for a light incident on the filter layer at the (a) degree, and a third central wavelength for a light incident on the filter layer at the (b) degree
Implementation Method 2
the second lens assembly is designed so that an angle at which at least a portion of a plurality of light rays of a plurality of parallel lights incident on the second lens assembly within the first angle range is incident to a cross section of the first gap layer is (0) to (a) degree
Implementation Method 3
the second lens assembly comprises: at least four lens layers including a first lens layer, a second lens layer, a third lens layer and a fourth lens layer
Data Source
AI summary
A LiDAR device comprising: a transmission module including a laser emitting array and a first lens assembly, wherein the laser emitting array is configured to emit a plurality of lasers at a first wavelength and wherein the first lens assembly is configured to steer the plurality of lasers at different angles within a first angle range; a reception module including a laser detecting array and a second lens assembly, wherein the laser detecting array includes at least two detectors for detecting at least a portion of the plurality of lasers and wherein the second lens assembly is configured to distribute the plurality of lasers to the at least two detectors; wherein the second lens assembly comprise: at least four lens layers including a first lens layer, a second lens layer, a third lens layer and a fourth lens layer; at least two gap layers including a first gap layer and a second gap layer; and a filter layer located in the first gap layer.