Lidar Cover Module Wavelength Shift Compensation
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Solution Overview
Problem
Existing LIDAR system cover modules fail to maintain high transmittance across a range of wavelengths, leading to noise interference and unreliable automatic driving systems, especially during heating and defogging processes.
Innovation Solution
A cover module design for LIDAR systems comprising a first glass, a heating unit, and a second glass, where the heating unit is disposed between the glasses, ensuring a transmittance deviation of less than 2% between a major and secondary wavelength range, and calculating the secondary wavelength range based on temperature changes and wavelength shift coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If glass with high transmittance over a wide wavelength range is used, then the transmittance is improved, but noise increases and reliability deteriorates
Solution Approach 1:
The glass cover is designed with non-uniform optical properties across different wavelength ranges. Specifically, it has high transmittance (≥90%) in the target wavelength range (800-1000nm) while having low transmittance in other wavelength ranges, creating localized optical quality variations that filter noise while preserving signal transmission
Solution Approach 2:
The patent specifies precise transmittance parameter ranges: ≥90% in the target wavelength range (800-1000nm) and ≤10% in other wavelength ranges. This parameter control ensures optimal signal transmission while blocking noise, resolving the contradiction between high transmittance and system reliability
2Ease of operation
If the cover module is heated for defogging, then defogging performance is improved, but wavelength shift occurs and transmittance decreases
Solution Approach 1:
The glass cover is pre-designed with a transmittance spectrum that anticipates future wavelength shifts during heating. The transmission peak is positioned at 800-1000nm such that even when heating causes a redshift in wavelength, the transmittance remains ≥90% in the shifted range, ensuring continuous effective operation during defogging
Solution Approach 2:
The patent designs the glass optical properties to compensate for the harmful effects of heating-induced wavelength shift. By positioning the high transmittance band to cover the expected shifted wavelength range, the design cushions against the potential loss of transmittance, ensuring that defogging operations do not compromise detection performance
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 allows for high transmittance in both the major and secondary wavelength ranges, ensuring effective light transmission during temperature changes, thus maintaining the reliability of LIDAR systems for automated driving applications.
Implementation Method 1
a heating unit, and a second glass, wherein the heating unit is disposed on the first glass and the second glass is disposed on the heating unit
Data Source
AI summary
A cover module of a LIDAR system includes a first glass, a heating unit, and a second glass. The heating unit is disposed on an outer side of the first glass. The second glass is disposed on an outer side of the heating unit, wherein a deviation between a transmittance of a major wavelength range of the cover module and a transmittance of a secondary wavelength range of the cover module is less than 2%. A wavelength of the secondary wavelength range is calculated by the following formula: (wavelength of the major wavelength range)+[ΔT+(Tfog−T0)]×α, in which the T0 is an initial temperature of the light source unit, Tfog is a temperature of dew point, ΔT is a defogging temperature deviation, and α is a wavelength shift with temperature coefficient of the light source unit.