Floating Cathode Trace Oxygen Sensor Evaporation Control
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Solution Overview
Problem
Existing trace oxygen sensors require complex moisture maintenance systems to maintain stable electrolyte levels, limiting their ability to accurately detect oxygen at parts-per-billion levels due to evaporation issues and cumbersome design.
Innovation Solution
A floating cathode configuration that maintains a constant contact area with the electrolyte, minimizing evaporation and eliminating the need for humidifiers, while allowing the cathode to freely move with changing electrolyte levels, coupled with a flexible connector for electrical connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cathode is submersed in the electrolyte or wetted with a wetting support material, then the electrochemical reaction can occur, but the electrolyte level becomes unstable due to evaporation and requires complex moisture maintenance systems
Solution Approach 1:
The floating cathode automatically adjusts its position to maintain constant contact area with the electrolyte surface, self-regulating the system without external moisture maintenance equipment. The cathode floats on the electrolyte and moves up or down with electrolyte level changes, maintaining stable electrochemical reaction conditions inherently.
Solution Approach 2:
The cathode is designed to be dynamically adjustable, floating on the electrolyte surface rather than being fixed. This dynamic configuration allows the cathode to freely change its position as electrolyte level varies, automatically maintaining optimal contact area for electrochemical reactions without requiring external control systems.
2Loss of substance
If a humidifier and water reservoir tank are used to maintain constant moisture level, then electrolyte evaporation is prevented, but the device becomes cumbersome and expensive with temperature control requirements
Solution Approach 1:
The invention converts the harmful effect of electrolyte evaporation into a beneficial self-regulating mechanism. The floating cathode's ability to move with electrolyte level changes transforms potential instability into a feature that automatically maintains constant contact area, eliminating the need for humidifiers and temperature control systems.
3Device complexity
If the cathode is held fixed in position, then the structure is simple, but the contact area with electrolyte changes as electrolyte level varies, affecting sensing accuracy
Solution Approach 1:
The cathode transitions from a fixed position to a dynamic floating position, allowing it to automatically adjust to electrolyte level changes. This dynamic configuration ensures constant contact area between the cathode and electrolyte, maintaining stable electrochemical reactions and accurate oxygen sensing without complex positioning mechanisms.
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
Enables accurate detection of oxygen at ppb levels without the need for complex moisture maintenance systems, reducing noise and improving sensitivity, allowing for reliable measurement of oxygen in gas samples down to 10 ppb or less.
Implementation Method 1
a floating cathode configuration that maintains a constant contact area with the electrolyte, minimizing evaporation and eliminating the need for humidifiers, while allowing the cathode to freely move with changing electrolyte levels
Implementation Method 2
oxygen from the sample is electrochemically reduced at the cathode and at the same time, anode is electrochemically oxidized into lead oxide
Implementation Method 3
anode is electrochemically oxidized into lead oxide
Data Source
AI summary
An apparatus and a method for a trace oxygen sensor is configured with a floating cathode that has a capability to detect part-per-billion (ppb) level or less of oxygen in a gas background. An electrolyte reservoir can supply electrolyte when electrolyte level is low. An electrolyte reservoir may be connected to the main cell along with a protection electrode.