Breathing Mask Gas Sensor Pumping for Interference-Free Measurement
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Solution Overview
Problem
Existing methods for determining the partial pressure or percentage of a gaseous constituent in a breathing mask's gas mixture flow are disrupted when two gases with different mixtures flow in opposite directions, leading to inaccurate measurements.
Innovation Solution
A method involving a solid ionic conductor pump electrochemical cell is placed between the flow chamber and sensing chamber, pumping the gas constituent into the sensing chamber only when the first gas mixture flow is detected and stopping when the second gas mixture flow occurs, ensuring accurate sensing of the first gas mixture's characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensing chamber continuously monitors gas mixture characteristics, then measurement coverage is improved, but measurement precision deteriorates due to interference from alternating gas flows
Solution Approach 1:
The pump is activated in advance when the first gas mixture flow is detected, transferring gas constituent to the sensing chamber before the second gas mixture flow arrives. This preliminary action ensures the sensing chamber contains only the first gas mixture characteristics, preventing measurement interference and maintaining high measurement precision without requiring complex real-time filtering systems
Solution Approach 2:
The pump operates periodically rather than continuously, activating only during periods when the first gas mixture flow is present and deactivating when the second gas mixture flow occurs. This periodic operation synchronized with the alternating gas flows achieves accurate measurements while reducing device complexity by eliminating the need for continuous pumping and complex flow separation mechanisms
2Measurement precision
If gas constituent is continuously pumped into the sensing chamber, then sensing response is improved, but measurement accuracy deteriorates due to contamination from second gas mixture
Solution Approach 1:
The pump transfers the gas constituent to the sensing chamber in advance when the first gas mixture flow is detected, preparing the sensing chamber with the correct gas sample before the second gas mixture flow arrives. This preliminary action ensures both rapid response and high accuracy by eliminating the need for continuous pumping and post-contamination filtering
Solution Approach 2:
The pump acts as an intermediary mechanism that selectively transfers gas constituent from the flow chamber to the sensing chamber only when the first gas mixture is present. This intermediary function isolates the sensing chamber from direct exposure to alternating gas flows, maintaining measurement accuracy while enabling rapid response through controlled transfer rather than continuous mixing
3Productivity
If the pump operates continuously, then gas transfer efficiency is improved, but energy consumption increases and measurement accuracy decreases
Solution Approach 1:
The pump operates periodically based on the detection of the first gas mixture flow, activating only when needed to transfer gas constituent and remaining inactive during the second gas mixture flow period. This periodic operation maintains high gas transfer efficiency during active periods while dramatically reducing overall energy consumption compared to continuous operation, as the pump runs only during necessary intervals
Solution Approach 2:
The pump performs gas transfer in advance when the first gas mixture is detected, completing the transfer operation before the second gas mixture arrives. This preliminary action eliminates the need for continuous pumping, allowing the pump to operate efficiently during brief active periods and remain idle during inactive periods, optimizing both productivity and energy usage
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
This approach prevents interference from the second gas mixture, allowing for precise measurement of the first gas mixture's partial pressure or percentage, enhancing the accuracy of gas analysis in breathing masks.
Implementation Method 1
placing a solid ionic conductor of a pump electrochemical cell interposed between the flow chamber and a sensing chamber, a) pumping said gas constituent from the flow chamber into the sensing chamber through the solid ionic conductor
Implementation Method 2
sensing said characteristic of the first gas mixture flow in the sensing chamber
Data Source
Figure 1
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Figure 6~8
AI summary
A method for determining a characteristic such as partial pressure or percentage of a gaseous constituent in a first gas mixture flow (32) in a flow chamber (30) where flows alternatively said first gas mixture flow (32) and a second gas mixture flow (34) comprising the following steps: a) introducing the first gas mixture flow (32) into a sensing chamber (40) when the first gas mixture flow (32) flows in the flow chamber (30), b) preventing introduction of gas from the flow chamber (30) into the sensing chamber (40) at least when the second gas mixture flow (34) flows in the flow chamber (30), c) sensing said characteristic of the first gas mixture flow (32) in the sensing chamber (40).