Pressure Sensor Gel Covering Structure Against Foreign Matter Adhesion
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Solution Overview
Problem
Conventional pressure sensors with adhesive gels are prone to foreign matter adhesion, leading to changes in sensor characteristics, which are difficult to remove and can cause stress-induced deformations.
Innovation Solution
A pressure sensor design featuring a non-adhesive, non-coupling cover portions on the gel surface to prevent foreign matter adhesion and stress-induced deformations, using spherical particles with varying sizes to ensure comprehensive coverage and easy removal of adhering particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gel has high adhesiveness to seal the pressure detection device, then waterproof sealing is improved, but foreign matter easily adheres to the gel surface causing characteristic changes
Solution Approach 1:
The gel surface is segmented into multiple independent adhesive regions rather than a continuous adhesive surface. Each micro-bead creates an isolated adhesive zone, preventing continuous foreign matter adhesion while maintaining sealing effectiveness at each segment point.
Solution Approach 2:
Micro-beads serve as intermediary structures between the gel and the external environment. These micro-beads modify the surface properties to reduce foreign matter adhesion while their adhesive nature maintains the sealing function, acting as a mediator that resolves the contradiction between adhesion and contamination resistance.
2Measurement precision
If foreign matter adheres to the gel surface, then sensor characteristics change, but removal of the foreign matter is difficult
Solution Approach 1:
By segmenting the adhesive surface into discrete micro-bead regions, foreign matter can only adhere to individual bead surfaces rather than spreading across the entire gel surface. This segmentation makes removal easier as contaminants are localized to small, accessible areas on individual beads.
Solution Approach 2:
The micro-beads have spherical or curved surfaces that reduce the contact area between foreign matter and the gel. This curvature makes it easier for foreign matter to be dislodged compared to flat surfaces, as the contaminant sits on top of the curved bead rather than adhering to a large planar area.
3Reliability
If the gel has high adhesiveness, then sealing performance is improved, but stress-induced deformations occur affecting sensor accuracy
Solution Approach 1:
Segmenting the adhesive gel into micro-bead regions distributes the sealing stress across multiple independent points rather than concentrating it across a continuous adhesive layer. This reduces stress-induced deformations that would otherwise affect sensor accuracy while maintaining effective sealing at each micro-bead location.
Solution Approach 2:
The gel structure transitions from uniform adhesiveness to localized adhesive regions at micro-bead surfaces. This local quality change allows adhesive sealing function to be concentrated where needed at bead-gel interfaces while reducing overall stress distribution across the gel body, preventing deformations that would compromise measurement precision.
Data Source
AI summary
A pressure sensor includes a housing with an opening, a pressure sensitive body inside the housing, a waterproof gel to seal the pressure sensitive body inside the housing, and cover portions on a surface of the gel. The cover portions are non-adhesive and do not couple to each other.