Capacitance Sensor Window for LIDAR Debris Detection
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Solution Overview
Problem
Autonomous vehicle sensors, such as LIDAR sensors, are impaired by debris on the sensor window, leading to incorrect data generation and potentially dangerous situations due to obstructed or deflected light paths, which existing technologies struggle to detect and address effectively.
Innovation Solution
A system utilizing a transparent thin film conductor, like indium tin oxide, to detect changes in capacitance caused by debris on the sensor window, allowing processors to identify and locate debris, activate a cleaning system to clear it, and adjust sensor data accordingly, ensuring accurate data generation and sensor functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a LIDAR sensor is used to detect objects in the environment, then the autonomous vehicle can generate 3D maps and locate objects, but the sensor window becomes vulnerable to debris contamination that degrades or invalidates sensor data
Solution Approach 1:
The patent applies preliminary action by detecting debris on the sensor window before it significantly degrades sensor data quality. The capacitance sensor continuously monitors for debris accumulation and triggers cleaning operations proactively, preventing the sensor window from reaching a state where data becomes invalid or unreliable.
Solution Approach 2:
The patent implements feedback by using the capacitance sensor to continuously monitor the sensor window condition and provide real-time information to the cleaning system controller. This feedback loop enables the system to adjust cleaning operations based on actual debris levels, ensuring sensor data reliability while avoiding unnecessary cleaning cycles.
2Reliability
If the sensor window is cleaned frequently to maintain data quality, then sensor performance is preserved, but energy consumption and system complexity increase
Solution Approach 1:
The capacitance sensor detects debris accumulation at early stages before it impacts sensor performance, allowing the cleaning system to operate only when necessary. This preliminary detection prevents unnecessary cleaning cycles, reducing energy consumption while maintaining sensor reliability.
Solution Approach 2:
The cleaning system is activated autonomously based on capacitance sensor readings without requiring manual intervention or continuous monitoring. The system self-regulates cleaning operations based on actual debris conditions, optimizing energy usage while preserving sensor performance.
3Difficulty of detecting and measuring
If a transparent thin film conductor is added to the sensor window to detect debris via capacitance changes, then debris detection capability is improved, but the sensor window complexity and manufacturing difficulty increase
Solution Approach 1:
The transparent thin film conductor serves multiple functions: it maintains the structural integrity of the sensor window, allows optical transmission for LIDAR operation, and provides capacitance-based debris detection. This multi-functionality reduces the need for separate components, actually simplifying the overall system despite the added functionality.
Solution Approach 2:
The patent uses a thin film conductor that can be deposited directly onto the sensor window surface, creating an integrated structure rather than adding bulky separate components. This thin film approach minimizes structural complexity while enabling capacitance-based debris detection.
4Illumination intensity
If the transparent thin film conductor is etched in a pattern to reduce light interference, then optical transmission is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by etching the thin film conductor in specific patterns only in areas where light transmission is critical, while maintaining continuous film coverage in other regions for optimal capacitance detection. This selective patterning reduces light interference while minimizing the impact of manufacturing variations.
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 solution enhances the reliability and safety of autonomous vehicles by effectively detecting and clearing debris from sensor windows, reducing computational load and maintaining sensor performance, even in adverse weather or soiling conditions, thereby preventing dangerous situations.
Implementation Method 1
The one or more processors are configured to identify a change in capacitance using the transparent thin film conductor
Data Source
AI summary
The disclosure relates to detecting and clearing debris from a sensor window. For instance, a system may include the sensor window and one or more processors. The sensor window may include a transparent thin film conductor. The one or more processors may be configured to identify a change in capacitance using the transparent thin film conductor, detect debris on the sensor window using the change in capacitance, and activate a cleaning system in order to clear the detected debris from the sensor window.