Superhydrophobic Sensor Window for Debris-Resistant Optical Sensing
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Solution Overview
Problem
Optical sensing systems in vehicles face interference from water-based debris such as rain, snow, and mud, which can hinder their ability to sense the environment effectively.
Innovation Solution
The implementation of a vehicle-mounted optical sensing system featuring a sensing window with a superhydrophobic surface that prevents the retention of water and debris, allowing electromagnetic radiation to pass through while maintaining system functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical sensor is exposed to the environment for sensing, then the sensing capability is improved, but water-based debris accumulates on the sensor surface interfering with sensing
Solution Approach 1:
A sensing window is introduced as an intermediary component between the optical sensor and the external environment. This window allows electromagnetic radiation to pass through for sensing while preventing water-based debris from directly contacting and accumulating on the optical sensor surface, thus resolving the contradiction between maintaining sensing capability and preventing debris interference.
Solution Approach 2:
The harmful function of the sensing window surface (where debris would accumulate) is separated from the optical sensor. By extracting the exposure function to the window while keeping the sensor protected, the system maintains sensing capability through the window while preventing debris accumulation on the sensor itself.
2Object-affected harmful factors
If a conventional sensing window is used, then the optical sensor is protected from debris, but water accumulates on the window surface obstructing electromagnetic radiation
Solution Approach 1:
The surface properties of the sensing window are modified by applying a superhydrophobic coating that changes the contact angle of water to at least 150 degrees. This parameter change in surface wettability prevents water accumulation on the window surface, ensuring that electromagnetic radiation can pass through unobstructed while maintaining sensor protection.
Solution Approach 2:
The superhydrophobic surface causes water to form discrete droplets rather than spreading as a film. This phase-like transition in water behavior on the surface allows droplets to roll off easily, maintaining optical transmission while still providing protection.
3Productivity
If the sensing window is continuously exposed to environment, then sensing function is maintained, but cleaning and maintenance becomes necessary
Solution Approach 1:
The superhydrophobic coating on the sensing window provides self-cleaning functionality. Water droplets rolling off the high-contact-angle surface automatically remove debris and contaminants, enabling the sensing window to maintain its optical properties without requiring manual cleaning or maintenance interventions.
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 superhydrophobic surface ensures continuous and unobstructed sensing of the environment by preventing water-based debris from interfering with the optical sensors, enhancing the reliability and accuracy of the sensing system.
Implementation Method 1
The outer side includes a superhydrophobic surface that is in fluidic communication with the environment. The superhydrophobic surface may have a contact angle with water of at least 150 degrees.
Data Source
AI summary
A sensing system that includes an optical,sensor and a sensing window. The optical sensor is configured to sense with electromagnetic radiation an environment. The sensing window is coupled to a structure, such that the electromagnetic radiation passes therethrough from the environment to the optical sensor to be sensed thereby. The sensing window includes an inner side that faces toward the optical sensor and an outer side that faces away from the optical sensor. The outer side includes a superhydrophobic surface that is in fluidic communication with the environment.