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Solution Overview
Problem
Existing LiDAR sensor devices face limitations in detection accuracy, particularly due to noise generated by stray light and the re-incidence of reflection light at the vertex of the parabola, which affects the reliability of distance measurements.
Innovation Solution
The sensor device incorporates a reflection mirror unit with a reflection surface that excludes the vertex of the parabola and features a first part with higher reflectance and a second part with lower reflectance, strategically arranged to minimize stray light and improve detection accuracy by reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflection surface with uniform high reflectance is used, then light emission intensity is improved, but noise from stray light and re-incidence increases
Solution Approach 1:
The reflection surface is divided into different regions with different reflectance characteristics. The vertex region has lower reflectance to prevent re-incidence of reflected light into the sensor, while other regions maintain high reflectance to ensure sufficient light emission intensity. This local differentiation resolves the contradiction between overall light intensity and local noise generation.
Solution Approach 2:
The reflection surface is segmented into functionally distinct zones: a vertex region with reduced reflectance for noise suppression, and peripheral regions with high reflectance for light emission. This segmentation allows simultaneous optimization of both light intensity and detection accuracy by assigning different optical properties to different spatial regions.
2Area of stationary object
If the vertex of the parabola is included in the reflection surface, then light reflection coverage is improved, but noise from re-incidence of reflection light increases
Solution Approach 1:
The vertex region, which causes harmful re-incidence of light, is extracted from the high-reflectance reflection surface. By creating a low-reflectance zone at the vertex, the harmful optical path is eliminated while the rest of the reflection surface continues to provide comprehensive light reflection coverage.
Solution Approach 2:
The vertex region, which would normally cause harmful re-incidence noise, is converted into a beneficial low-reflectance zone that actively suppresses noise. The reduced reflectance at the vertex transforms a potential harm source into a noise-filtering element that improves overall detection accuracy.
3Reliability
If a reflection surface excluding the vertex is used, then noise from re-incidence is reduced, but light reflection efficiency may be compromised
Solution Approach 1:
Instead of uniformly reducing reflectance across the entire reflection surface, only the vertex region has reduced reflectance while peripheral regions maintain high reflectance. This local quality differentiation ensures noise reduction at the critical vertex area while preserving light reflection efficiency in other regions, thus maintaining measurement reliability without significant energy loss.
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
This configuration enhances the detection accuracy of the LiDAR sensor device by reducing noise from stray light and ensuring that reflection light does not re-enter the sensor unit, leading to improved measurement reliability.
Implementation Method 1
a reflection mirror unit that reflects light emitted from the sensor unit
Implementation Method 2
a second part having lower reflectance than the first part
Data Source
AI summary
Provided is a sensor device including: a sensor device including: a sensor unit that emits light and receives light reflected by an object; and a reflection mirror unit that reflects light emitted from the sensor unit. A reflection surface of a reflection mirror included in the reflection mirror unit includes a first part and a second part having lower reflectance than the first part.