Periodic Heating Gas Sensing for Foul Odor Source Detection
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Solution Overview
Problem
Existing gas sensors, such as those described in PTL 1, struggle to accurately detect foul-smelling gases that occur at a foul odor source within a continuous flow of detection-target gas.
Innovation Solution
A gas detection method and system that utilize a gas sensor to alternately heat and non-heat the sensor, obtaining and multiplying gas adsorption-desorption signals with a reference signal to enhance detection accuracy, and optionally using filters to attenuate specific signal components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a gas sensor continuously detects gas concentration in a continuous flow, then the detection process is simple, but the accuracy of identifying foul-smelling gases is low
Solution Approach 1:
The gas sensor is heated periodically in cycles, alternating between heating phases and non-heating phases. This periodic heating causes odor molecules to desorb during heating and re-adsorb during non-heating, creating a cyclic detection pattern that enhances the ability to distinguish foul-smelling gases from background gases, thereby improving detection accuracy without requiring complex additional hardware
Solution Approach 2:
The detection system uses feedback by comparing the gas adsorption-desorption signal obtained during the detection cycle with a reference signal that repeats rise and fall in a regular cycle. The multiplier unit multiplies these signals to generate a detection result, creating a feedback mechanism that continuously refines the detection accuracy by synchronizing with the periodic heating pattern
2Reliability
If odor molecules adhere to the gas sensor, then detection sensitivity increases, but the sensor becomes less responsive to new gases
Solution Approach 1:
Periodic heating is applied to the gas sensor, causing adherent odor molecules to desorb during the heating phase and allowing fresh gas molecules to adsorb during the non-heating phase. This cyclic process maintains detection reliability by periodically refreshing the sensor surface while preserving the ability to detect new gases promptly
Solution Approach 2:
The heating process discards adherent odor molecules from the sensor surface through desorption, and the non-heating process recovers the sensor's ability to adsorb new gas molecules. This cycle ensures the sensor remains both reliable in detecting target gases and responsive to new gas inputs
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
Improves the accuracy of detecting foul-smelling gases by volatilizing adherent odor molecules and reducing noise interference, allowing for precise identification of foul odor sources.
Implementation Method 1
a gas sensor that outputs a gas adsorption-desorption signal corresponding to a gas adsorption concentration
Implementation Method 2
alternating, in a first cycle, heating and non-heating of the gas sensor exposed to a sample gas
Implementation Method 3
obtaining the gas adsorption-desorption signal output from the gas sensor, the gas adsorption-desorption signal being a signal in which a detection-target gas adsorption-desorption signal corresponding to the detection-target gas and a non-detection-target gas adsorption-desorption signal corresponding to the non-detection-target gas are superposed on each other
Data Source
AI summary
A gas detection method includes: (a) alternating, in a first cycle, between heating and non-heating of a gas sensor exposed to a sample gas that includes a detection-target gas and a non-detection-target gas other than the detection-target gas; (b) obtaining the gas adsorption-desorption signal output from the gas sensor, the gas adsorption-desorption signal being a signal in which a detection-target gas adsorption-desorption signal corresponding to the detection-target gas and a non-detection-target gas adsorption-desorption signal corresponding to the non-detection-target gas are superposed on each other; and (c) multiplying, with use of a multiplier, the gas adsorption-desorption signal obtained in (b) and a reference signal that repeats a rise and a fall in a regular cycle.