Semiconductor Window Lidar EMI Suppression
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Solution Overview
Problem
Lidar systems face challenges in effectively managing electromagnetic interference (EMI) while maintaining good optical transmission properties, which can be disrupted by external obstructions like snow and ice.
Innovation Solution
A semiconductor window is integrated into the lidar system's enclosure, which is electrically conductive and coupled to the housing, allowing for the attenuation of electromagnetic radiation while enabling the transmission of optical signals. This window also includes a heating element to remove obstructions such as snow, ice, and frost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a traditional window material is used in the lidar enclosure, then optical transmission is maintained, but electromagnetic interference cannot be effectively suppressed
Solution Approach 1:
The patent employs a composite window structure consisting of a semiconductor substrate (such as silicon or germanium) that integrates both optical transparency and electrical conductivity. This composite material allows the window to simultaneously transmit optical signals while suppressing electromagnetic interference through its conductive properties, resolving the contradiction between EMI suppression and optical transmission reliability
Solution Approach 2:
The semiconductor window is designed with specific local properties: it maintains optical transparency in the visible and infrared ranges while exhibiting electrical conductivity at specific regions to suppress EMI. The window may also include localized heating elements or conductive coatings in specific areas to enhance EMI suppression without compromising overall optical transmission
2Reliability
If the lidar system operates in cold environments, then compactness is maintained, but optical transmission is blocked by snow and ice obstructions
Solution Approach 1:
The patent incorporates heating elements integrated into or behind the semiconductor window that activate preemptively or in response to detected obstructions. These heating elements melt snow and ice on the window surface before they can block optical transmission, maintaining reliable signal transmission in cold environments
Solution Approach 2:
The heating elements, which consume energy, convert the harmful effect of cold temperatures and ice accumulation into a beneficial solution. By applying controlled heat to the window surface, the system eliminates obstructions and maintains optical transmission reliability, turning the problem of cold-weather operation into a manageable condition
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 semiconductor window significantly improves EMI suppression while maintaining optical transparency, ensuring uninterrupted optical signal transmission and removing external obstructions, thereby enhancing the lidar system's performance and reliability.
Implementation Method 1
The enclosure includes a semiconductor window associated with an opening of the housing. The semiconductor window includes a semiconductor material configured to allow at least a portion of the emitted optical signal and the received optical signal to pass through the semiconductor window
Implementation Method 2
This window also includes a heating element to remove obstructions such as snow, ice, and frost
Data Source
AI summary
A system includes a light source, a receiver, and an enclosure. The light source is configured to emit an optical signal and the receiver is configured to detect a received optical signal including at least a portion of the emitted optical signal scattered by an external target. The enclosure includes a housing and a semiconductor window. The semiconductor window includes a semiconductor material configured to allow at least a portion of the emitted optical signal and the received optical signal to pass through the semiconductor window. The enclosure, including the housing and the semiconductor window, is configured to attenuate radio-frequency (RF) electromagnetic radiation.