Gas Sensor Controller Dynamic Parameter Variation
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Solution Overview
Problem
Conventional gas sensor arrays are bulky and inefficient, requiring multiple sensors and complex arrangements to accurately characterize gas compositions, limiting their suitability for compact, handheld devices.
Innovation Solution
A system that modifies multiple operating conditions of a gas sensor during a measurement cycle, including UV light intensity, temperature, and voltage, using a controller to enrich measurements and improve discrimination, and compares readings with stored target characterizations to classify gases accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional gas sensor arrays use multiple sensors and complex arrangements to accurately characterize gas compositions, then measurement precision is improved, but device complexity increases and volume increases
Solution Approach 1:
The patent applies parameter changes by varying multiple operating conditions (temperature, UV light intensity, voltage) of a single gas sensor during a measurement cycle. This allows one sensor to produce differentiated responses that enable accurate gas characterization, replacing the need for multiple sensors with different materials or configurations.
Solution Approach 2:
The single gas sensor is made multi-functional by changing its operating parameters during measurement. The sensor performs multiple characterization functions that would traditionally require multiple dedicated sensors, achieving universality through dynamic parameter adjustment rather than physical multiplication of components.
2Measurement precision
If conventional gas sensor arrays use multiple sensors to characterize gas compositions, then measurement precision is improved, but the device volume increases
Solution Approach 1:
The patent merges the functionality of multiple gas sensors into a single sensor by dynamically changing its operating conditions during measurement. This consolidation reduces the physical volume required while maintaining the measurement precision that would traditionally require multiple parallel sensors.
Solution Approach 2:
By changing operating parameters (temperature, UV intensity, voltage) over time, a single sensor generates multiple measurement dimensions, replacing the spatial arrangement of multiple sensors with a temporal parameter variation approach, thereby reducing device volume.
3Device complexity
If a single gas sensor is used with fixed operating conditions, then device complexity is reduced, but measurement precision deteriorates due to insufficient discrimination capability
Solution Approach 1:
The patent introduces dynamics by continuously varying operating conditions (temperature, UV light intensity, voltage) during the measurement cycle. This dynamic approach transforms a static single-sensor system into one that effectively explores multiple operational states, enhancing discrimination capability without increasing device complexity.
Solution Approach 2:
The measurement process uses periodic action by cycling through different operating conditions in a structured sequence. This periodic variation in parameters enables the single sensor to gather differentiated information over time, achieving precision comparable to multiple sensors with fixed conditions.
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 more precise and accurate gas characterization in a compact format, reducing the need for multiple sensors and complex arrangements, while allowing for remote processing and reduced storage requirements.
Implementation Method 1
a UV light source arranged so as to illuminate a reactive surface of the gas sensor
Implementation Method 2
a heater arranged so as to heat a reactive surface of the gas sensor
Implementation Method 3
gas particles may become adsorbed on the surface of the sensing layer
Implementation Method 4
oxidation-reduction reactions may occur, leading to a change in the impedance of the sensing layer
Data Source
AI summary
An olfactometer or “electronic nose” is able to vary a plurality of operating parameters during a test cycle in parallel, in accordance with a measurement protocol. This measurement protocol, and correspondingly the operating parameters to be varied, the values to be set for those parameters, and the timing of the variation in these values is tailored to most effectively distinguish between likely candidates in a particular testing scenario. A characterisation library is then used to match the results of the measurement protocol to the best target in the characterisation library. Test protocols and/or characterisation libraries may be downloaded from a remote server on demand, and certain activities may be carried out either locally or remotely.