Multi-Pixel Gas Sensor for Precise Multi-Gas Detection
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Solution Overview
Problem
Current gas sensors are limited to detecting a single gas, requiring separate sensors for each gas of interest, which is inefficient and costly.
Innovation Solution
A multi-pixel gas sensor system utilizing a plurality of sensing elements with different gas-sensitive materials, each with independent temperature control, measures electrical properties like resistance and capacitance at various frequencies to identify multiple gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single gas sensor is used to detect one specific gas, then the sensor achieves high detection precision for that gas, but multiple separate sensors are required to detect multiple gases, increasing device complexity and cost
Solution Approach 1:
The patent combines multiple sensing elements with different gas-sensitive materials into a single integrated sensor device. Each sensing element detects different gases or gas components, and their signals are processed together to achieve multi-gas detection in one device, resolving the contradiction between detection precision and device complexity
Solution Approach 2:
The sensor device is designed with multi-functionality to detect multiple types of gases simultaneously. By incorporating various gas-sensitive materials in different sensing elements, the single device can identify and quantify multiple gases (e.g., CO, CO2, NO2, O3) that would otherwise require separate dedicated sensors
2Measurement precision
If multiple separate gas sensors are used to detect different gases, then each gas can be detected with high precision, but the overall system becomes more complex and costly
Solution Approach 1:
Multiple sensing elements are merged into a single integrated sensor package with shared structural components (substrate, electrodes, encapsulation). The sensing elements are arranged in a compact configuration and connected to a common signal processing circuit, reducing system complexity while maintaining multi-gas detection precision
Solution Approach 2:
The sensor is segmented into multiple sensing elements, each specialized for detecting specific gases or gas components. This segmentation allows each element to maintain high detection precision for its target gas while the overall integrated structure keeps the system compact and manageable
3Adaptability or versatility
If different gas-sensitive materials are used in different sensing elements, then the sensor can identify multiple gases with high specificity, but the manufacturing process becomes more complex
Solution Approach 1:
Different gas-sensitive materials are applied to different sensing elements according to their specific detection requirements. Each sensing element has locally optimized material composition tailored to its target gas, enabling high detection versatility while following a standardized manufacturing process for the overall sensor structure
4Measurement precision
If independent temperature control is implemented for each sensing element, then the sensor achieves optimal detection performance for different gases, but the device complexity and energy consumption increase
Solution Approach 1:
The temperature control system is made dynamic and adaptive rather than static. The control circuitry adjusts the temperature of each sensing element based on real-time detection needs and environmental conditions, allowing optimal performance with reduced energy consumption compared to continuous fixed temperature control
Solution Approach 2:
The operating temperature of each sensing element is changed and optimized according to the specific gas being detected and the characteristics of its gas-sensitive material. This parameter optimization enables high detection precision while minimizing energy consumption by maintaining only the necessary temperature for each sensing element's operation
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 simultaneous detection and quantification of multiple gases by tuning operational and physical parameters, enhancing sensitivity and specificity.
Implementation Method 1
Certain gas sensors rely on physical changes or chemical changes in a chemical sensing material while in the presence of a gas to determine concentration of the gas
Implementation Method 2
Certain gas sensors rely on physical changes or chemical changes in a chemical sensing material while in the presence of a gas to determine concentration of the gas
Implementation Method 3
The sensing elements also include a heater and a temperature sensor, and are configured for individual temperature control
Implementation Method 4
measuring the electrical properties of the gas sensitive materials of the plurality of sensing elements
Data Source
AI summary
A gas sensor for sensing gases in an environment, the gas sensor including a substrate, a plurality of sensing elements, control circuitry, and a gas determination module. A sensing element of the plurality of sensing elements includes a structure coupled to the substrate, a gas sensitive material overlying the structure, and a plurality of electrodes underlying the gas sensitive material. The control circuitry is for measuring electrical properties of the gas sensitive materials of the plurality of sensing elements. The gas determination module is configured to identify at least one gas in the environment based at least in part on the measured electrical properties.