Lid Structure Aperture Curvature for Gas Sensor Sensitivity
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Solution Overview
Problem
Gas sensors face sensitivity issues due to moisture and particulates, and existing aperture designs in lid structures result in low gas flow and contamination, leading to inefficient sensing and complex manufacturing processes.
Innovation Solution
A lid structure with a shelter portion and apertures featuring a first curved surface close to the sensing area and a second curved surface farther away, with distinct curvature centers, creating a kidney-shaped aperture configuration that enhances gas flow uniformity and simplifies manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional aperture design is used in the lid structure, then the manufacturing process is simple, but the gas flow is low and contamination occurs
Solution Approach 1:
The aperture is designed with curved surfaces instead of flat or simple geometric shapes. The first curved surface and second curved surface create a kidney-shaped aperture that optimizes gas flow patterns and reduces contamination by directing flow away from the sensing area.
Solution Approach 2:
The aperture employs asymmetric curvature centers where the first center of curvature of the first curved surface is at a different location than the second center of curvature of the second curved surface. This asymmetric design creates optimal gas flow uniformity and prevents contamination while maintaining manufacturing simplicity.
2Measurement precision
If the sensing area is exposed to detect gas, then gas sensing is enabled, but moisture and particulates affect sensitivity
Solution Approach 1:
The lid structure provides selective protection: the shelter portion covers the sensing area to protect it from moisture and particulates, while the aperture with specific curved surfaces allows gas to reach the sensing area. This creates different protection levels in different regions - the sensing area is protected from harmful factors but accessible to target gas molecules.
Solution Approach 2:
The aperture acts as an intermediary structure that mediates between the need for gas access and protection from contamination. The curved surfaces of the aperture guide and filter gas flow, allowing beneficial gas molecules to reach the sensing area while preventing harmful moisture and particulates from causing contamination.
3Productivity
If the aperture has equal path lengths for gas entry, then reaction efficiency increases, but the aperture design becomes complex
Solution Approach 1:
The curved surfaces of the aperture create equal path lengths for gas molecules to travel from the aperture to the sensing area. The first curved surface and second curved surface are designed with specific radius of curvature relationships that ensure uniform gas distribution and equal flow paths, improving reaction efficiency while maintaining a relatively simple manufacturing process.
Data Source
AI summary
An electronic device includes a transducer including a sensing area and a covering structure that covers the transducer. The covering structure includes a shelter portion and defines at least one aperture. The shelter portion covers the sensing area. The aperture includes a first curved surface and a second curved surface farther away from the sensing area than the first curved surface, and a first center of a first curvature of the first curved surface is at a different location than a second center of a second curvature of the second curved surface.