LiDAR Optical Core Isolation for Polygon-Motor Noise Control
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Solution Overview
Problem
LiDAR devices experience undesirable acoustic noises and vibrations due to the high-speed operation of polygon-motor rotating elements and galvo oscillations, which can affect the accuracy and performance of the optical core assembly, especially when mounted on vehicles where these vibrations can be transmitted to the interior, disturbing passengers.
Innovation Solution
An isolation system is implemented for the LiDAR optical core assembly, comprising a polygon-motor base element coupled with a plurality of isolators fixed around the center of gravity, designed to mitigate acoustic noise and vibrations caused by the polygon-motor rotating element during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the polygon-motor rotating element operates at high speeds (3000-12000 rpm) to improve scanning performance, then productivity is improved, but acoustic noise and vibrations increase
Solution Approach 1:
The patent introduces an isolation system comprising a polygon-motor base element and multiple isolators as intermediary components between the polygon-motor rotating element and the LiDAR device housing. The isolators act as mediators that absorb and dampen vibrations generated by the high-speed rotating polygon, preventing these vibrations from being transmitted to the housing and passengers while allowing the polygon to continue operating at high speeds for optimal scanning performance.
2Measurement precision
If the galvo oscillates at very high speeds to steer light in particular directions, then measurement precision is improved, but stability of the optical core assembly deteriorates
Solution Approach 1:
The isolation system serves as an intermediary that decouples the galvo's high-speed oscillations from the optical core assembly's structural components. The isolators absorb the mechanical energy and vibrations generated by the galvo's rapid movements, allowing the galvo to achieve precise light steering control without compromising the overall stability and alignment of the optical core assembly.
3Object-generated harmful factors
If isolators are added to mitigate vibrations, then harmful factors are reduced, but device complexity increases
Solution Approach 1:
The isolation system is segmented into distinct functional components: a polygon-motor base element that provides mounting structure, and multiple individual isolators that can be independently optimized and replaced. This segmentation allows for modular design where the complexity is distributed across simple, standardized components rather than a single complex vibration suppression mechanism.
Solution Approach 2:
The patent optimizes the isolators by adjusting parameters such as material composition, damping coefficients, and geometric configuration to achieve effective vibration mitigation with minimal structural complexity. By carefully selecting isolator parameters, the system achieves noise reduction without requiring excessive numbers of components or complex arrangements.
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 isolation system enhances the stability and reliability of the LiDAR device under variable environmental conditions, reducing noise levels and maintaining accurate performance by absorbing energy and minimizing displacement caused by imbalances, shocks, and vibrations, thereby improving the overall scanning performance and passenger comfort.
Implementation Method 1
a plurality of isolators substantially fixed to the polygon-motor base element and disposed relative to each other around a spatial location determined based on a center of gravity of at least one of the optical core assembly and the polygon-motor rotating element. The plurality of isolators is adapted to mitigate acoustic noise caused by at least the polygon-motor rotating element during operation of the optical core assembly.
Data Source
AI summary
An isolation system for a light detection and ranging (LiDAR) optical core assembly is provided. The LiDAR optical core assembly comprises a polygon-motor rotating element, an oscillating reflective element, and transmitting and collection optics. The isolation system comprises a polygon-motor base element coupled to the polygon-motor rotating element and a plurality of isolators substantially fixed to the polygon-motor base element and disposed relative to each other around a spatial location determined based on a center of gravity of at least one of the optical core assembly and the polygon-motor rotating element. The plurality of isolators is adapted to mitigate acoustic noise caused by at least the polygon-motor rotating element during operation of the optical core assembly.