Membrane-Type Sensor Sealing for Pressure-Resistant Detection
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Solution Overview
Problem
Membrane-type sensors with internal solution replenishment face reduced measurement precision due to membrane deformation under sample solution pressure, which can lead to internal solution deterioration.
Innovation Solution
A membrane-type sensor design where the membrane is sandwiched between a lid member and a housing unit with a seal, limiting pressure application to a sealed portion and supported by an electrode structure, allowing external solution replenishment to prevent deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the internal solution storage space is connected to the tank installed under atmospheric pressure to allow internal solution replenishment, then the internal solution deterioration is suppressed, but the membrane pressure resistance is reduced causing measurement precision degradation
Solution Approach 1:
The membrane is divided into two functional regions: a sealed portion that bears the pressure load and a non-sealed portion that allows substance permeation. This segmentation allows the membrane to maintain structural integrity under pressure while still enabling the internal solution replenishment function, thus resolving the contradiction between pressure resistance and solution stability.
Solution Approach 2:
Different portions of the membrane are given different properties: the sealed portion is designed to withstand pressure from the sample solution, while the non-sealed portion is optimized for substance permeation. This local differentiation allows the membrane to simultaneously achieve pressure resistance and maintain internal solution quality through controlled replenishment.
2Strength
If the membrane is fixed in a liquid-tight manner through the seal member, then the pressure application area is limited, but the membrane deformation under pressure still occurs
Solution Approach 1:
The electrode structure serves as a counterbalancing support that opposes the pressure force applied to the membrane from the sample solution. By positioning the electrode structure to face the membrane, it provides a counteracting force that prevents membrane deformation, thus maintaining both pressure resistance and shape stability.
Solution Approach 2:
The electrode structure acts as an intermediary element between the sample solution pressure and the membrane. Instead of the pressure acting directly on the entire membrane surface, the electrode structure intercepts and distributes the force, reducing the net pressure load on the membrane and preventing deformation.
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
Improves membrane pressure resistance and maintains measurement precision by reducing force application on the membrane, suppressing internal solution deterioration and maintaining pH stability.
Implementation Method 1
a membrane that allows a specific substance to permeate therethrough and into the housing
Implementation Method 2
allows a specific substance in a sample solution to permeate through the membrane
Implementation Method 3
measuring a current change generated through the reduction reaction
Data Source
AI summary
A membrane-type sensor that allow a specific substance in a sample solution to permeate through a membrane to be detected based on a current flowing between a working electrode and a counter electrode that are immersed in an internal solution. A housing includes a housing unit containing the internal solution and an electrode structure, and a lid member attached to a tip end portion of the housing unit. The lid member fixing the membrane by sandwiching the membrane between the lid member and the housing unit such that the membrane opposes a tip end surface of the electrode structure. The membrane is sandwiched between the tip end surface of the electrode structure and the opposing surface of the lid member through a seal member, is pressed against the tip end surface of the electrode structure by the seal member, and is fixed in a liquid-tight manner.