Gas Sensor Multi-Layer Absorption Diffusion Trace Detection
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Solution Overview
Problem
Existing gas sensors lack the sensitivity to detect trace volatile organic compounds effectively, as they are not optimized for high sensitivity across various types of trace gases for different applications.
Innovation Solution
A gas sensor design featuring a heater layer, a gas sensing layer, a diffusion layer, and an absorption layer, where the absorption layer has superior absorption properties and the diffusion layer has superior diffusion properties, with distinct average pore sizes and materials, and a controller for intermittent heater operation to enhance detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a coating layer with ceramic particles is provided on an electrode to improve detection sensitivity, then the gas sensing capability is enhanced, but the detection sensitivity for various trace gases cannot be sufficiently improved across different applications
Solution Approach 1:
The gas sensor is divided into multiple functional layers: a gas sensing layer for detection, a diffusion layer for gas transport, and an absorption layer for gas concentration. This segmentation allows each layer to be optimized independently for its specific function, enabling high sensitivity detection across various trace gases.
Solution Approach 2:
Each layer is given specific local properties: the absorption layer has high gas absorption capacity, the diffusion layer has optimized pore structure for gas transport, and the sensing layer has catalytic properties for detection. This local quality optimization resolves the contradiction by making each part specialized rather than using a uniform structure.
2Measurement precision
If the gas sensing layer structure is optimized to improve detection sensitivity, then sensitivity increases, but it becomes difficult to achieve high sensitivity for various types of trace gases simultaneously
Solution Approach 1:
The sensor structure is segmented into three distinct layers with different functions, allowing complexity to be distributed and managed separately rather than concentrated in a single sensing layer.
Solution Approach 2:
The multi-layer structure serves multiple functions simultaneously: gas absorption, diffusion control, and sensing detection. This universal design approach allows the same structure to handle various trace gases effectively without requiring separate optimization for each gas type.
3Measurement precision
If conventional gas sensor structures are used, then the structure is simple, but the detection sensitivity for trace gases in the range of 0.001 to 10 ppm cannot be achieved
Solution Approach 1:
The sensor is segmented into multiple functional layers, which increases structural complexity but enables detection sensitivity in the 0.001 to 10 ppm range that cannot be achieved with conventional single-layer structures.
Solution Approach 2:
The diffusion layer and absorption layer utilize porous materials with specific pore size distributions to enhance gas transport and concentration capabilities, enabling trace gas detection at extremely low concentrations.
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 highly sensitive detection of trace gases in the range of 0.01 to 1 ppm, improving upon conventional sensors by optimizing absorption and diffusion layers and heater control for rapid thermal desorption and diffusion, allowing for accurate and timely detection of volatile organic compounds.
Implementation Method 1
an absorption layer that covers a surface of the diffusion layer, the absorption layer has a more excellent absorption property of the measurement target gas than the diffusion layer
Implementation Method 2
the diffusion layer has a more excellent diffusion property of the measurement target gas than the absorption layer
Implementation Method 3
the measurement target gas is thermally desorbed from the absorption layer by driving the heater layer
Implementation Method 4
the measurement target gas is detected by change in resistance value of the coating layer
Data Source
AI summary
A gas sensor having a heater layer; and a gas detector that is heated by the heater layer to detect a measurement target gas. The gas detector has a gas sensing layer, a diffusion layer that covers a surface of the gas sensing layer, and an absorption layer that covers a surface of the diffusion layer. The absorption layer has greater absorption of the measurement target gas than the diffusion layer, and the diffusion layer has greater diffusion of the measurement target gas than the absorption layer.