Lidar Sensor Angular Resolution via Reflectance Contrast
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Solution Overview
Problem
Existing LIDAR sensors face challenges in achieving accurate angular resolution, especially at high horizontal rotation speeds, due to interference between transmitted and received light, and limitations in small size designs.
Innovation Solution
A LIDAR sensor design incorporating a transmission/reception module, a rotary module assembly, and a fixing module, which includes a substrate assembly, shielding components, and a slit fixing unit to calculate rotation angle and RPM based on light reflectance differences, enhancing angular resolution through a step difference and light reflectance contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the horizontal rotation speed is increased to improve productivity, then the measurement speed is improved, but the angular resolution accuracy deteriorates
Solution Approach 1:
A marker assembly with high-reflectance markers is introduced as an intermediary reference object. The markers reflect laser light to generate distinct signal edges that enable precise angular position detection through step difference calculation, allowing accurate angular resolution measurement even during high-speed rotation
Solution Approach 2:
The patent uses light reflectance contrast (analogous to color changes) by employing markers with different reflectance properties. The high-reflectance markers create detectable signal variations when illuminated by the laser, enabling precise angular position measurement through the contrast in reflected light intensity
2Volume of moving object
If the LIDAR sensor size is reduced to improve compactness, then the device size is improved, but the interference suppression between transmitted and received light deteriorates
Solution Approach 1:
The sensor is divided into functionally independent modules: a transmission/reception module for light handling, a rotary module assembly for rotation, and a marker assembly for reference. This segmentation allows each module to be optimized for its specific function while maintaining overall compactness and enabling effective interference suppression through spatial separation of light paths
Solution Approach 2:
The reflector assembly acts as an intermediary component that receives transmitted light, reflects it toward the object, and directs the returned light to the reception module. This intermediary structure enables effective light path management in a compact configuration, suppressing interference between transmitted and received light beams
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 design enables precise measurement of horizontal angles and achieves fine angular resolution during high-speed rotation by utilizing a step difference and light reflectance contrast, effectively addressing interference and size limitations.
Implementation Method 1
irradiate light onto a subject, and then analyze light reflected from the subject
Implementation Method 2
a shielding sheet which is assembled so as to be spaced apart from a side surface of the substrate assembly to which the sensor unit is fixed and shields an electromagnetic wave
Implementation Method 3
generates an RPM and a rotation angle based on a light reception amount of the reflection light which is received by a sensor unit by reflecting the transmitted light
Data Source
AI summary
The present exemplary embodiments propose a LIDAR sensor including: a transmission/reception module which transmits transmission light and receives reflection light reflected from an object; a reflector assembly which has an empty space to assemble the transmission/reception module at one side, receives the transmission light from the transmission/reception module to reflect the transmission light toward the object and transmits the reception light reflected from the object to the transmission/reception module, a rotary module assembly which rotates the transmission/reception module and generates an RPM and a rotation angle based on a light reception amount of the reflection light which is received by a sensor unit by reflecting the transmitted light; and a fixing module which supports the transmission/reception module and the rotary module.