Gas Sensor Porous-Member Blockage Detection Using Acoustic Waves
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Solution Overview
Problem
Existing gas sensors face issues with blockage in porous members due to contaminants, leading to deviations in response rate and accuracy, which are typically addressed through time-consuming and costly bump checks using hazardous gases.
Innovation Solution
A method and device using pressure waves, such as acoustic waves, are emitted within the sensor chamber to measure changes in amplitude and phase, allowing for the detection of partial blockages in porous members without the need for traditional bump checks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional bump checks are performed regularly to detect blockages, then sensor functionality can be ensured, but time consumption and cost increase
Solution Approach 1:
The patent replaces the mechanical/chemical bump check process with an acoustic wave-based detection system. Pressure waves are emitted through the porous member and the transmitted wave characteristics are analyzed to detect blockages, eliminating the need for physical bump check procedures while maintaining reliable detection capability
Solution Approach 2:
The sensor system performs self-diagnosis by continuously monitoring acoustic wave transmission through the porous member. The system detects its own blockage conditions without requiring external intervention or separate testing procedures, enabling autonomous functionality verification
2Reliability
If traditional bump checks are performed regularly to detect blockages, then sensor functionality can be ensured, but cost increases due to hazardous gases
Solution Approach 1:
The patent substitutes the chemical approach of using hazardous analyte gases with a physical acoustic wave approach. Pressure waves serve as the test signal, completely eliminating the need for hazardous gases while maintaining the ability to detect porous member blockages
Solution Approach 2:
The patent converts the potentially harmful requirement for hazardous test gases into a beneficial acoustic measurement system. The acoustic waves provide a safe, non-invasive method to detect blockages that previously required dangerous chemical substances
3Object-affected harmful factors
If porous members are used to protect sensor components, then contamination resistance is improved, but analyte transport may be impeded
Solution Approach 1:
The patent implements a feedback mechanism where acoustic wave transmission characteristics are continuously monitored to detect changes in porous member condition. When blockage is detected, the system can alert users or trigger maintenance actions, ensuring that analyte transport remains reliable while the porous member continues to provide protection
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 reduces the frequency of bump checks by electronically detecting blockages, ensuring sensor accuracy and reducing the use of hazardous gases, while maintaining sensor functionality and precision.
Implementation Method 1
emitting pressure waves within the inner chamber and measuring a response via a sensor responsive to pressure waves positioned within the inner chamber
Data Source
AI summary
A gas sensor device including a housing, a porous member through which the analyte gas is transportable in operative connection with the a of the housing to separate an inner chamber of the housing from the ambient environment, a gas sensor responsive to the analyte gas within the inner chamber, a source of pressure waves positioned within the inner chamber and spaced from the porous member so that any pressure waves emitted from the source of pressure waves that are transmitted out of the inner chamber are transmitted through the porous member, a sensor responsive to pressure waves, and circuitry in operative connection with the sensor responsive to pressure waves to relate a phase of a measured response of the sensor responsive to pressure waves to a state of blockage in the porous member.