Pressure Sensor Gel Surface Laser Structuring Against Dirt Buildup
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Solution Overview
Problem
The high tack of gel surfaces on sensors leads to dirt and dust accumulation, forming a crust that impairs sensor functionality over time, particularly affecting pressure sensitivity.
Innovation Solution
Applying laser radiation to the gel surface to reduce tack by removing or structuring the gel material, creating patterns like concentric rings or parallel lines, while optimizing irradiation parameters to ensure absorption without damaging the underlying sensing element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gel with high tack is used to cover the sensing element, then the gel provides good protective function and transfers ambient medium properties effectively, but the gel surface becomes soiled easily with dirt and dust particles adhering to it
Solution Approach 1:
The patent applies laser radiation to change the physical-chemical parameters of the gel surface, specifically modifying surface properties to reduce tack while preserving bulk gel characteristics. This resolves the contradiction by altering surface parameters independently from the bulk material properties that provide protection.
Solution Approach 2:
The laser treatment creates local modification only at the gel surface layer, leaving the bulk gel material unchanged. This allows the surface to have reduced tack for anti-soiling while the underlying gel maintains its protective and functional properties.
2Object-affected harmful factors
If laser radiation is applied to modify the gel surface, then the surface tack is reduced and dirt adhesion decreases, but there is a risk of damaging the underlying sensing element
Solution Approach 1:
The laser radiation is applied with controlled parameters to achieve partial modification - enough to reduce surface tack and prevent dirt adhesion, but not excessive to cause damage to the sensing element. The treatment is optimized to achieve the minimum necessary effect for anti-soiling while staying below the damage threshold.
Solution Approach 2:
The gel itself acts as an intermediary layer that absorbs and dissipates the laser energy, protecting the sensing element from direct laser exposure. The gel surface is modified through the laser radiation while the bulk gel and sensing element remain protected.
3Object-affected harmful factors
If the gel surface is structured with patterns like concentric rings or parallel lines, then the surface tack is reduced and crust formation is prevented, but the manufacturing process becomes more complex
Solution Approach 1:
The patent replaces complex mechanical structuring methods with laser radiation processing. The laser can create structured patterns (concentric rings, parallel lines) through optical fields and controlled material removal or modification, eliminating the need for complex mechanical tools and multiple processing steps.
Solution Approach 2:
The laser processing can be applied in periodic patterns (concentric rings, parallel lines) to create the desired surface structure. This periodic action of the laser beam creates the anti-soiling structure efficiently in a single processing step.
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 method effectively reduces surface tack, preventing crust formation and maintaining sensor functionality, while allowing for the use of high-tack gels and improving sensor sensitivity and durability.
Implementation Method 1
applying laser radiation through the housing opening to a gel surface of the gel facing away from the sensing element, such that the gel surface is modified by the applied laser radiation. The modification comprises removing gel material from the gel surface
Implementation Method 2
the structuring comprises forming a ring structure, in particular having a plurality of concentric rings, and/or a line structure, in particular having a plurality of parallel lines
Data Source
AI summary
A method for processing a sensor, in particular a pressure sensor, wherein the sensor has a sensing element arranged in a housing, wherein the housing has a housing opening, wherein a gel covering the sensing element is arranged inside the housing. The method includes: applying laser radiation through the housing opening to a gel surface of the gel facing away from the sensing element, such that the gel surface is modified by the applied laser radiation. A sensor, in particular a pressure sensor, comprising: a sensing element arranged in a housing, wherein the housing has a housing opening, wherein a gel covering the sensing element is arranged inside the housing, wherein the gel has a gel surface facing away from the sensing element and modified by laser radiation.