LiDAR Laser Output Array for Uniform Detector Illumination
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Solution Overview
Problem
Existing LiDAR devices face challenges in achieving uniformity in the amount of light received by each detecting unit, leading to inconsistencies in distance measurement and data accuracy.
Innovation Solution
A LiDAR device design that incorporates a laser emitting array and a laser detecting array, where the laser emitting array has a first sub-array with two laser emitting units of different diameters, and the reception optic is designed to provide greater illumination to one area of the detecting array compared to another, ensuring balanced light reception across detecting units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional laser emitting array with uniform emitting units is used, then the device structure is simple, but the light reception uniformity across detecting units is poor
Solution Approach 1:
The patent applies local quality by making different emitting units have different diameters based on their position in the array. Specifically, emitting units closer to the center have larger diameters while those at the edges have smaller diameters. This non-uniform design compensates for the varying light collection efficiency across the detecting array, improving overall light reception uniformity.
Solution Approach 2:
The patent employs asymmetry by deliberately designing emitting units with different sizes rather than using uniform diameters. The asymmetric diameter distribution (larger central units, smaller peripheral units) creates a balanced light emission pattern that compensates for geometric variations in the detecting array's light collection capability.
2Measurement precision
If all emitting units have the same diameter, then the manufacturing process is simple, but the amount of light received by each detecting unit varies significantly
Solution Approach 1:
The patent implements local quality by assigning different diameters to emitting units based on their specific positions in the array. This localized variation in emitting unit size compensates for position-dependent variations in light reception, ensuring more uniform measurement conditions across all detecting units and improving distance measurement accuracy.
Solution Approach 2:
The patent applies parameter changes by varying the diameter parameter of emitting units across the array. By changing this physical parameter systematically (larger at center, smaller at edges), the patent optimizes the light emission characteristics to achieve more uniform light reception and improved measurement precision.
3Reliability
If the reception optic provides uniform illumination across the detecting array, then the optical system is simple, but detecting units at different positions receive different amounts of light
Solution Approach 1:
The patent applies preliminary anti-action by pre-compensating for the expected non-uniform light reception through asymmetric emitting unit design. Before light reaches the detecting array, the emitting units are configured to produce a non-uniform emission pattern that counteracts the geometric variations in light collection, thereby achieving uniform effective reception without complex reception optics.
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 design enhances the uniformity of light reception across detecting units, thereby improving the accuracy and consistency of distance measurements and LiDAR data.
Implementation Method 1
a first laser emitting unit and a second laser emitting unit
Implementation Method 2
a reception optic, wherein the laser detecting array comprises a first detecting unit configured to detect laser emitted from the first laser emitting unit
Data Source
AI summary
A lidar device is proposed. The device may include a transmission module including a laser output array and transmission optics, the laser output array including a first laser emitting sub-array, and the first laser emitting sub-array including a first laser emitting unit and a second laser emitting unit. The device may also include a reception module including a laser detecting array and reception optics. The laser detecting array may include a first detecting unit configured to detect a laser beam emitted from the first laser emitting unit and a second detecting unit configured to detect a laser beam emitted from the second laser emitting unit.