Gas Detection False Alarm Reduction via Ambient Air Dilution
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Solution Overview
Problem
Conventional gas detection systems often generate false alarms due to factors like electrical noise, RF noise, and sensor degradation, leading to unnecessary shutdowns and increased maintenance costs.
Innovation Solution
A gas-detecting apparatus comprising a control module, sensor module, air chamber, valve, pump, and solenoid valve, which supplies ambient air to the sensor module when a high sensing signal is detected, allowing for differentiation between actual gas concentration increases and false alarms by diluting the gas concentration and verifying signal changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gas-detecting apparatus uses conventional detection methods, then the detection process is simple, but false alarms occur due to electrical noise, RF noise, and sensor degradation
Solution Approach 1:
The system performs preliminary actions by introducing ambient air to the sensor module before making a final detection determination. When a high sensing signal is detected, the control module first introduces ambient air through the valve and pump to verify whether the signal persists, thereby preliminarily filtering out false alarms caused by electrical noise, RF noise, or sensor degradation before triggering an actual alarm condition
Solution Approach 2:
The patent uses ambient air as an intermediary substance to test the sensor's response. By introducing ambient air through the valve and pump system, the control module mediates between the initial high sensing signal and the final alarm determination, using the sensor's response to the ambient air as an intermediate verification step to distinguish true gas leaks from false alarm conditions
2Reliability
If the apparatus introduces ambient air to verify high sensing signals, then false alarms are reduced, but the system complexity and response time increase
Solution Approach 1:
The system employs periodic action by implementing a time-based verification process. The control module monitors the sensing signal over a predetermined time period after introducing ambient air, checking whether the high sensing signal persists or disappears. This periodic monitoring approach balances the need for false alarm reduction with acceptable response time, as the verification occurs in discrete time intervals rather than continuously
Solution Approach 2:
The system applies partial action by only introducing ambient air when a high sensing signal is detected, rather than continuously. The valve and pump system activates partially - only during verification conditions - thereby reducing the overall time loss compared to continuous verification, while still providing sufficient false alarm reduction for critical detection scenarios
3Measurement precision
If the system continuously monitors sensing signals with verification, then detection precision improves, but energy consumption increases
Solution Approach 1:
The system uses periodic action to monitor sensing signals - the control module continuously receives sensing signals from the sensor module, but only activates the verification process (opening the valve and activating the pump) when a high sensing signal is detected. This periodic verification approach maintains measurement precision for critical conditions while significantly reducing energy consumption compared to continuous verification of all signals
Solution Approach 2:
The system applies partial action by performing full verification (introducing ambient air through the pump and valve) only when necessary - specifically when high sensing signals are detected. For normal operating conditions, the system uses minimal energy for basic signal reception without activating the verification mechanism, thereby balancing measurement precision with energy conservation
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
Prevents false alarms by distinguishing between actual gas leaks and noise or sensor malfunctions, ensuring accurate detection and reducing unnecessary shutdowns and maintenance costs.
Implementation Method 1
supplies ambient air to the sensor module when a high sensing signal is detected, allowing for differentiation between actual gas concentration increases and false alarms by diluting the gas concentration and verifying signal changes
Data Source
AI summary
A gas-detecting apparatus, having a gas inlet and a gas outlet, for detecting a false alarm is disclosed. The gas-detecting apparatus comprises a control module, a sensor module, and an air chamber. In an example embodiment, the sensor module is electrically connected with the control module. The sensor module has a sensor inlet and a sensor outlet. The sensor inlet is fluidly coupled to the gas inlet of the gas-detecting apparatus. The air chamber has an air inlet and an air outlet, wherein the air inlet is fluidly coupled to the gas inlet of the gas-detecting apparatus and the air outlet is fluidly coupled to the gas outlet. The control module is configured to receive a first sensing signal for a first level of gas from the sensor module and determine whether magnitude of the first sensing signal is higher than a first threshold value. In an instance when the magnitude of the first sensing signal is higher than the first threshold value, the control module causes the air chamber to supply ambient air to the sensor module through the sensor inlet of the sensor module.