Vehicle Laser Radar Polarization Control for Wide-Angle Sensitivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional laser radar devices experience decreased sensitivity in wide-angle visual zones due to uniform polarization of laser light across the scanning angle, leading to reduced reflection and detection strength of laser light from obstacles.
Innovation Solution
A light scanning device and method that incorporates a transparent plate or windshield glass inclined at a predetermined angle, with a light output unit that rotates the polarization plane of laser light based on the angle of inclination and azimuth, optimizing the transmission and reflection rates to maintain sensitivity across the scanning zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the laser light is polarized with a fixed polarized direction to eliminate strong reflections from glossily flat surfaces, then the reflection from glossily flat surfaces is reduced, but the reflected laser light from obstacles in wide-angle visual zones has decreased strength
Solution Approach 1:
The patent applies the dynamics principle by making the polarization direction of the laser light variable rather than fixed. The light polarization unit rotates the polarization plane of the laser light according to the scanning angle, so that the polarization direction changes dynamically across different scanning positions. This allows the system to maintain appropriate reflection characteristics for both glossily flat surfaces and obstacles at various angles.
Solution Approach 2:
The patent applies the parameter changes principle by changing the polarization angle parameter of the laser light based on the scanning angle. The control unit adjusts the polarization direction parameter dynamically as the scanning angle changes, optimizing the balance between eliminating reflections from glossily flat surfaces and maintaining sufficient reflected light strength from obstacles in wide-angle visual zones.
2Device complexity
If the polarization plane of laser light is kept uniform across the entire scanning angle, then the laser light transmission is simplified, but the sensitivity of detecting reflected laser light decreases in wide-angle visual zones
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a static uniform polarization configuration to a dynamic polarization control system. The light polarization unit rotates the polarization plane according to the scanning angle, and the control unit coordinates this rotation to optimize detection sensitivity across the entire scanning range, thereby resolving the contradiction between simplicity and precision.
Solution Approach 2:
The patent applies the feedback principle through the control unit that monitors the scanning angle and adjusts the polarization plane accordingly. This feedback mechanism ensures that the polarization direction is continuously optimized based on the current scanning position, maintaining high detection sensitivity across all angular positions while managing the complexity through automated control.
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 solution effectively increases the transmission rate and maintains sensitivity of laser light detection in wide-angle visual zones by rotating the polarization plane of the scanning beam, preventing sensitivity loss and ensuring effective obstacle detection.
Implementation Method 1
The light output unit instructs the light polarization unit to rotate the polarization plane of the laser light on the basis of the predetermined angle of inclination of the transparent plate and an azimuth angle in the horizontal direction
Implementation Method 2
The light output unit then transmits the rotated laser light to the transparent plate in order to scan the rotated laser light to the outside of the laser scanning device through the transparent plate
Implementation Method 3
the laser light reflected from both sides of the wide-angle visual zone has a decreased strength (or sensitivity)
Data Source
AI summary
An on-vehicle laser radar device scans laser light in front and side zones through the windshield glass of a vehicle in a horizontal direction in order to detect an obstacle. When projecting the laser light emitted from the light source to the windshield glass, the device rotates a polarization plane of the laser light according to the angle of inclination of the windshield glass and an azimuth angle in the horizontal direction, and outputs the polarized laser light through the windshield glass in order to scan the laser light toward front and side visual zones of the vehicle.