Off-Axis LiDAR Optics With Echo Beam Deflection for Pixel Shift
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Solution Overview
Problem
LiDAR systems face pixel shift issues due to the positional disparity between transmitting and receiving modules, particularly affecting detection accuracy for close-range targets, leading to incomplete reception of echo beams.
Innovation Solution
An off-axis optical system with a deflecting element positioned between the receiving module and its optical axis, deflecting echo beams from close-range targets to correct pixel shift and enhance detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an off-axis optical system is used for LiDAR, then the system can scan both distant and close-range targets, but pixel shift occurs causing incomplete reception of echo beams from close-range targets
Solution Approach 1:
A deflecting element is introduced as an intermediary component between the receiving module and the echo beams. This element refracts the echo beams from close-range targets to correct the pixel shift, allowing complete reception while maintaining the off-axis configuration for versatile detection range.
2Measurement precision
If the deflecting element is positioned closer to the receiving module, then pixel shift correction is enhanced, but the optical path length is reduced
Solution Approach 1:
The patent optimizes the position and parameters of the deflecting element to achieve the best balance between pixel shift correction and optical path length. By carefully selecting the deflection angle and position, the system achieves effective correction without excessive path length reduction.
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 addresses pixel shift issues, ensuring complete reception of echo beams from close-range targets, thereby improving LiDAR detection accuracy.
Implementation Method 1
At least part of echo beams is refracted by the deflecting element to reach the receiving module
Data Source
AI summary
This application discloses an off-axis optical system and a LiDAR. The off-axis optical system includes a transmitting module, a receiving module, and a deflecting element. The transmitting module and the receiving module are arranged along a first direction perpendicular to the optical axis of the receiving module. The deflecting element is positioned on a light-incident side of the receiving module, with a gap existing along the first direction between the deflecting element and the optical axis of the receiving module. At least part of echo beams, which are formed by reflection of scanning beams emitted from the transmitting module off a target, are refracted by the deflecting element before reaching the receiving module.