Multi-Layer Gas Sensor with Integrated Heater for Ambient Compensation
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Solution Overview
Problem
Existing air quality detection systems in buildings and vehicles are inadequate for comprehensive monitoring, as they fail to cover a wide range of air ingredients and are not cost-effective, especially when air flow rates decrease, and are sensitive to ambient changes like temperature and moisture.
Innovation Solution
A single sensor element with three sensitive layers that generate analyzable signals, requiring only four terminals for connection, allowing for efficient detection of various air ingredients and accounting for drift and contamination effects, while being cost-effective and adaptable for both indoor and outdoor use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple sensors are used to detect different air ingredients, then the detection capability is improved, but the device complexity and cost increase
Solution Approach 1:
The patent combines multiple sensing functions into a single sensor element by integrating three different acting layers (first, second, and third acting layers) that respond to different air ingredients. This merging approach allows the detection of multiple gases (such as CO, CO2, and other pollutants) while maintaining a simple single-sensor structure with only four electrical terminals, avoiding the complexity of multiple separate sensors and their interconnections.
Solution Approach 2:
The single sensor element is designed with multi-functionality by incorporating three different acting layers, each sensitive to specific air ingredients. The sensor can simultaneously detect multiple types of pollutants and air quality parameters, making it a universal detection device that replaces multiple specialized sensors while reducing overall system complexity and cost.
2Measurement precision
If semiconductor gas sensors are used for air quality detection, then the detection sensitivity is improved, but the sensitivity to ambient changes (temperature, moisture) increases
Solution Approach 1:
The sensor is segmented into three distinct acting layers, each with specific sensitivity characteristics to different air ingredients. This segmentation allows the system to differentiate between signals caused by target gases versus those caused by ambient conditions, as each layer responds differently to various stimuli. The analyzing unit can process these differentiated signals to compensate for ambient interference.
Solution Approach 2:
The analyzing unit processes signals from all three acting layers and uses algorithms to compensate for ambient condition variations. By analyzing the combined response pattern across multiple layers, the system can distinguish between actual air ingredient concentrations and changes caused by temperature or moisture, effectively reducing false readings and improving measurement accuracy under varying environmental conditions.
3Device complexity
If a single sensor element with three acting layers is used, then the cost and complexity are reduced, but the ability to cover comprehensive chemical space may be limited
Solution Approach 1:
Each acting layer is designed with specific local quality characteristics, being selectively sensitive to different types of air ingredients. The first acting layer may be optimized for certain gases while the second and third layers respond to different substances. This localized specialization within the single sensor element allows comprehensive chemical space coverage through the combination of layer-specific responses, achieving multi-detection capability without requiring multiple separate sensors.
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 efficient detection of different air ingredients, reduces the impact of ambient changes, and provides a cost-effective solution for monitoring air quality in vehicles and closed spaces, allowing for precise control of ventilation systems.
Implementation Method 1
a single sensor element having preferably three acting layers sensitive to certain gases, which generate analyzable signals
Implementation Method 2
a heater (4) laterally adjacent to the acting layers (S1, S2, S3)
Data Source
AI summary
Detecting air ingredients is obtained, a heater and gas sensitive acting layers are arranged on a substrate, which are connectable to an analyzing unit. Electrical resistances of n acting layers are connected in series; heater is a temperature sensor connected in parallel with this series connection, electrical resistance of heater is smaller than the sum of electrical resistances of acting layers and resistances are connected with a total of n+1 electrical terminals via electrodes so that heater is connected with two terminals and n−1 other terminals are connected with a respective junction that interconnects two acting layers. Heater is intermittently heated so that a predefined constant temperature of acting layers is achieved, temperature of acting layers is acquired by determining electrical resistance of heater; voltages in the series connection of acting layers are analyzed and a concentration of gases are determined from electrical resistances of acting layers.