Metal Oxide Nanostructure Gas Sensor for VOC Measurement
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Solution Overview
Problem
Current ethanol producers in industries like wine and spirits face challenges in accurately measuring ethanol gas emissions due to the high cost and complexity of traditional instrumentation, with a need for a low-cost alternative to quantify volatile organic compounds (VOCs) effectively.
Innovation Solution
A low-cost gas sensor system utilizing semiconductive metal oxide nanostructures, specifically zinc oxide nanostructures, which vary in resistance in response to VOCs, operated with an ultraviolet light source and integrated with an ohm meter and computing device to measure ethanol and other VOC concentrations, suitable for use in various industrial settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional specialized instrumentation is used to measure ethanol gas emissions, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent employs low-cost metal oxide semiconductor gas sensors that can be easily replaced, substituting expensive traditional specialized instrumentation. These sensors provide sufficient measurement precision for ethanol and VOC emissions while being economically viable for widespread deployment in wineries and breweries.
Solution Approach 2:
The patent utilizes the electrical resistance parameter of metal oxide semiconductor materials that changes in response to VOC exposure. By monitoring resistance variations of the metal oxide layer, the system achieves accurate VOC measurement without requiring complex traditional instrumentation, thus resolving the contradiction between measurement precision and device complexity.
2Measurement precision
If traditional specialized instrumentation is used to measure ethanol gas emissions, then measurement precision is improved, but cost increases
Solution Approach 1:
The patent employs low-cost metal oxide semiconductor gas sensors that can be easily replaced, substituting expensive traditional specialized instrumentation. These sensors provide sufficient measurement precision for ethanol and VOC emissions while being economically viable for widespread deployment in wineries and breweries.
Solution Approach 2:
The patent uses commercially available metal oxide semiconductor sensor technology that replicates the measurement capabilities of expensive specialized instrumentation through a different, more economical approach. This allows accurate VOC measurement without investing in costly traditional equipment.
3Measurement precision
If metal oxide nanostructure layer is used for sensing, then sensitivity to VOCs is improved, but device complexity increases
Solution Approach 1:
The patent utilizes a metal oxide nanostructure layer with high surface area and porous structure that enhances VOC adsorption and sensing sensitivity. The nanostructured metal oxide provides numerous active sites for gas interaction, achieving high sensitivity while maintaining a relatively simple sensor structure that can be integrated into cost-effective devices.
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
The system provides accurate and cost-effective measurement of ethanol and VOCs, maintaining sensitivity at relevant concentrations, even in moist environments, and can be used to assess the efficiency of scrubbers in industrial exhaust systems.
Implementation Method 1
relies on semiconductive properties of metal oxide nanostructures. The sensor's conductance is proportional to the concentration of VOCs
Implementation Method 2
the metal oxide nanostructure layer having a resistance, which varies in response to contact with the volatile organic compound
Implementation Method 3
The sensor is used with an ultraviolet light source which stimulates and cleans an active surface of the sensor
Data Source
AI summary
A gas sensor assembly includes a housing; an inlet assembly configured to carry a gaseous composition having a volatile organic compound into the housing; and an outlet assembly configured to carry the gaseous composition from the housing. The gas sensor assembly also includes an ultraviolet light source disposed within the housing and a gas sensor disposed within the housing and configured to sense an amount of the volatile organic compound.