Gas Sensor High Hydrogen Detection via Current Threshold
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Solution Overview
Problem
Existing gas sensors inaccurately measure high hydrogen gas concentrations due to hydrogen permeation through the membrane member, leading to a low signal output despite high hydrogen concentrations.
Innovation Solution
A gas sensor design featuring first and second sensor elements connected in series, with a membrane member allowing water vapor but not hydrogen gas permeation, and a calculation unit that detects current changes to accurately judge high hydrogen concentrations based on resistance variations and current thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a membrane member is used to prevent hydrogen gas permeation, then measurement precision is improved, but complete blocking of hydrogen gas is not achieved leading to inaccurate high concentration detection
Solution Approach 1:
A current detecting portion is introduced as an intermediary component to detect the current flowing through the sensor elements. This current information serves as a mediator to indirectly determine high hydrogen gas concentrations that cannot be directly measured by the potential difference method alone, thereby resolving the reliability issue in high concentration environments
Solution Approach 2:
The system uses feedback by comparing the detected current against a predetermined threshold value. When the current exceeds this threshold, the calculation unit determines that high hydrogen gas concentration is present, providing a feedback mechanism that compensates for the membrane's incomplete blocking capability
2Measurement precision
If the membrane member blocks water vapor but not hydrogen gas completely, then humidity influence is reduced, but hydrogen gas still permeates causing signal attenuation
Solution Approach 1:
The current detecting portion acts as an intermediary that provides additional information about hydrogen gas presence. By detecting current changes in the sensor elements, the system can identify high concentration environments even when hydrogen gas permeates the membrane and attenuates the potential difference signal
Solution Approach 2:
The invention changes the detection parameter from relying solely on potential difference to including current detection. This parameter change allows the system to detect high hydrogen gas concentrations through current variations that occur when hydrogen permeates the membrane, compensating for the signal attenuation
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 high hydrogen gas concentrations by distinguishing current changes related to hydrogen presence, improving judgment accuracy and excluding excessive initial current, even in environments where oxygen may be depleted.
Implementation Method 1
The membrane member has the property of allowing permeation of water vapor but not allowing permeation of hydrogen gas
Implementation Method 2
each having a resistance value that varies with changes in temperature thereof
Data Source
AI summary
Disclosed is a gas sensor for detecting hydrogen gas in a measurement gas atmosphere, including: a first installation part defining a first inner space in communication with the measurement gas atmosphere through a solid electrolyte membrane member; a second installation part defining a second inner space in direct communication with the measurement gas atmosphere; first and second sensor elements respectively installed in the first and second inner spaces; and a calculation unit configured to calculate the concentration of the hydrogen gas according to a potential between the first and second sensor elements. The gas sensor further includes a current detecting portion that detects a current flowing through the first and second sensor elements. The calculation unit is configured to, when the current detected by the current detecting portion is larger than or equal to a threshold value, judge that the hydrogen gas is present at high concentration.