LiDAR Windshield Signal Transmission Region for NIR Transmittance
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Solution Overview
Problem
Current LiDAR systems in automobiles face operational inefficiencies due to high blocking rates of near-infrared wavelengths by existing windshields, particularly in adverse weather conditions, which affects their ability to transmit and receive laser light effectively.
Innovation Solution
A front windshield design featuring an outer and inner glass layer with an intermediate adhesive film, optimized for high transmittance and low tinted coefficient for P-polarized light within the 800 nm to 1600 nm range, ensuring greater than 83% transmittance and reduced absorption, allowing for improved LiDAR system operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If existing windshield glass is used to enhance thermal comfort inside the automobile, then thermal insulation performance is improved, but transmittance for laser light with wavelengths of 905 nm and 1550 nm deteriorates
Solution Approach 1:
The patent applies local quality by creating a signal transmission region with specific optical properties (high transmittance for P-polarized light at 905nm and 1550nm wavelengths) in a localized area of the windshield, while the rest of the windshield maintains its thermal insulation properties through conventional glass composition and structure
Solution Approach 2:
The patent uses composite materials by combining conventional glass layers with a specifically engineered intermediate adhesive film that contains infrared-transmissive particles, creating a multi-layer composite structure that simultaneously provides thermal insulation and laser light transmission capabilities
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 enhances the detection precision and operational efficiency of LiDAR systems by ensuring high transmittance of P-polarized light, maintaining LiDAR system functionality even in adverse weather conditions while maintaining aesthetic and thermal insulation properties.
Implementation Method 1
The front windshield includes an outer glass layer, an inner glass layer, and an intermediate adhesive film between the outer glass layer and the inner glass layer. The P-polarized light is incident on the signal transmission region at an angle of incidence (AOI) θ ranging from 0.942 rad to 1.222 rad. The signal transmission region has a transmittance greater than or equal to 83% for the P-polarized light incident on the signal transmission region.
Implementation Method 2
an existing windshield glass has a relatively high blocking rate for near-infrared rays to enhance thermal comfort inside the automobile, which results in a low transmittance of the front windshield for the laser light with the wavelengths of 905 nm and 1550 nm
Data Source
AI summary
A front windshield and an automobile are provided in embodiments. The front windshield is operable in cooperation with a LiDAR system inside the automobile. The LiDAR system is configured to emit and/or receive P-polarized light towards the front windshield. A wavelength λ of the P-polarized light ranges from 800 nm to 1600 nm. The front windshield includes an outer glass layer, an inner glass layer, and an intermediate adhesive film. The intermediate adhesive film is between the outer glass layer and the inner glass layer. The front windshield has a signal transmission region. The P-polarized light is incident on the signal transmission region at an angle of incidence (AOI) θ of 0.942 rad to 1.222 rad. The signal transmission region has a transmittance greater than or equal to 83% for the P-polarized light incident on the signal transmission region.