Vehicle Sensor Assembly with Hydrophilic Coating and Fluid Layer
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Solution Overview
Problem
Vehicle sensors, such as those on passenger cars, face operational issues due to dirt accumulation and changing environmental conditions, which can lead to data distortion and reduced accuracy.
Innovation Solution
A sensor assembly featuring a hydrophilic coating on the lens, a polymer film adhered to the lens, and a fluid layer between the lens and the film, which attracts and retains water to prevent bubble formation and debris accumulation, ensuring clear data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polymer film is adhered to the sensor lens to protect it from debris, then protection from occlusion is improved, but air-water boundaries form causing light refraction and data distortion
Solution Approach 1:
A fluid layer is introduced as an intermediary substance between the polymer film and the sensor lens. This fluid layer eliminates air-water boundaries that cause light refraction, while the polymer film continues to provide protection from debris occlusion. The fluid layer acts as a mediator that resolves the conflict between protection and measurement precision.
Solution Approach 2:
The system combines multiple materials with different properties: a polymer film for mechanical protection, a hydrophilic coating for fluid attraction, and a fluid layer for optical clarity. This composite structure integrates the beneficial properties of each material to simultaneously achieve debris protection and accurate sensor data collection.
2Productivity
If the sensor lens is exposed to the environment for data collection, then sensor operation is enabled, but dirt accumulation occurs reducing sensor performance
Solution Approach 1:
A thin polymer film is applied over the sensor lens, creating a protective barrier that prevents dirt and debris from directly contacting and accumulating on the lens surface. This flexible thin film allows the sensor to continue operating while protecting it from environmental contaminants.
Solution Approach 2:
The polymer film serves as an intermediary layer between the sensor lens and the external environment. It allows electromagnetic waves to pass through for data collection while blocking physical contaminants, thus enabling continuous sensor operation without dirt accumulation.
3Measurement precision
If a fluid layer is introduced between the lens and polymer film to reduce distortion, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The hydrophilic coating on the sensor lens automatically attracts and retains the fluid layer, eliminating the need for additional mechanisms to maintain the fluid. The system uses the inherent properties of the materials to self-regulate the fluid layer presence, reducing complexity while maintaining measurement precision.
Solution Approach 2:
The hydrophilic coating changes the surface energy parameters of the lens, creating strong attraction to the fluid layer. This parameter change ensures the fluid layer remains in place without requiring complex retention mechanisms, simplifying the overall device structure while maintaining optical clarity.
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 assembly effectively reduces distortions caused by air-water boundaries, improving sensor data collection by maintaining clear transmission of electromagnetic waves and reducing occlusion from debris.
Implementation Method 1
Applying a hydrophilic coating to the sensor lens attracts water, reducing bubbles that may form between the sensor lens and the polymer film
Implementation Method 2
The hydrophilic coating can chemically attract water to form the fluid layer
Implementation Method 3
Pockets of water and air trapped between the polymer film and the sensor lens may distort, by refraction, light passing through the sensor lens to a receiver of a sensor
Implementation Method 4
The hydrophilic coating can allow transmission of at least one of visible electromagnetic waves, infrared electromagnetic waves, or microwave electromagnetic waves therethrough
Data Source
AI summary
An assembly includes a sensor lens, a polymer film adhered to the sensor lens, a hydrophilic coating applied to the sensor lens, and a fluid layer between the sensor lens and the polymer film, wherein the fluid layer is disposed on the hydrophilic coating.