LiDAR Detection Channel Polarization Segmentation
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Solution Overview
Problem
Existing LiDAR devices, particularly FMCW LiDAR devices, face challenges in detecting obstacles due to the weakness of TM mode polarization light in the reflection beam, leading to low detection probability.
Innovation Solution
The LiDAR device employs a laser transmission detection channel that transmits a detection beam with a first polarization state and receives a reflection beam with both first and second polarization states, allowing for full utilization of the reflection beam to measure obstacles and improve detection probability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only TE mode polarization light is received in the reflection beam, then the detection system is simple, but the detection probability is low due to weak TM mode polarization light
Solution Approach 1:
The detection channel is segmented into multiple polarization-sensitive detection channels, where each channel is configured to detect reflection beams with different polarization states (TE mode and TM mode). This segmentation allows the system to separately process and utilize both polarization components of the reflected light, thereby improving detection probability without overwhelming complexity
Solution Approach 2:
The system transitions from single-polarization detection to multi-polarization detection by adding a polarization dimension to the detection process. By configuring detection channels that are sensitive to different polarization states, the system effectively adds another dimension to the detection space, allowing simultaneous utilization of both TE and TM mode polarization lights in the reflection beam
2Reliability
If both TE and TM mode polarization lights are utilized in the reflection beam, then the detection probability is enhanced, but the device complexity increases
Solution Approach 1:
The laser transmission detection channel is designed with multi-functionality to handle both TE and TM mode polarization lights. The detection channels are configured to be sensitive to different polarization states, allowing a single optical system to perform multiple detection functions simultaneously - detecting both polarization components of the reflection beam without requiring entirely separate detection systems
Solution Approach 2:
The system merges the detection of TE and TM mode polarization lights into a unified detection framework. By configuring multiple detection channels within the same laser transmission detection channel to respond to different polarization states, the system combines the advantages of both polarization modes into a single integrated detection process, reducing overall system complexity compared to having completely separate detection systems
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 approach enhances the detection probability by making full use of both TE and TM mode polarization lights in the reflection beam, thereby overcoming the limitations of weak TM mode polarization light in existing systems.
Implementation Method 1
a laser transmission detection channel configured to transmit a detection beam having a first polarization state and a local oscillation beam having the first polarization state... a reflection beam is generated after the detection beam encounters the obstacle and is reflected by the obstacle, the reflection beam includes a first reflection sub-beam having a first polarization state and a second reflection sub-beam having a second polarization state
Implementation Method 2
one or more mixers configured to receive the local oscillation beam and the reflection beam, and perform a frequency-mixing operation on the local oscillation beam and the reflection beam to output a frequency-mixed beam
Data Source
AI summary
A LIDAR device is provided which includes a LiDAR chip including a laser transmission detection channel which transmits a detection beam and a local oscillation beam having a first polarization state, and includes: a light transmitting end emitting the detection beam, a reflection beam is generated after the detection beam is reflected by an obstacle, the reflection beam includes a first reflection sub-beam having a first polarization state and a second reflection sub-beam having a second polarization state; a light receiving end receiving at least one of the first and the second reflection sub-beams; a mixer receiving the local oscillation beam and the reflection beam, and performing a frequency-mixing operation on the local oscillation beam and the reflection beam to output a frequency-mixed beam; a detector receiving the frequency-mixed beam and output a detection electrical signal used to determine a distance and/or a speed of the obstacle.