Dynamic Voltage Sensor Array for Chemical Species Identification
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Solution Overview
Problem
Current contaminant detection systems in environmental control systems (ECS) are inadequate in identifying and managing volatile organic compounds (VOCs) and other air contaminants, particularly in aircraft and building environments, as they rely on generic metal oxide sensors that cannot differentiate between multiple contaminants and require manual detection by pilots or occupants, leading to prolonged exposure and potential safety risks.
Innovation Solution
A system comprising a controller and an array of sensors, including cyclic voltammetry, catalytic combustion, and conductometric sensors, that continuously monitor air contaminants by sweeping voltage and comparing sensor responses to a lookup table, enabling rapid identification and corrective action to maintain safe air quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If generic metal oxide sensors are used with constant voltage supply, then the device complexity is reduced and ease of operation is improved, but the ability to identify specific chemical species is lost and measurement precision deteriorates
Solution Approach 1:
The patent applies dynamics by transitioning from constant voltage supply to time-varying voltage sequences. The sensor excitation voltage is dynamically changed through multiple stages (e.g., first voltage level, second voltage level, third voltage level) to elicit different sensor responses that can be used to identify specific chemical species. This dynamic voltage application allows the system to maintain ease of operation while significantly improving measurement precision and chemical identification capability.
Solution Approach 2:
The patent implements parameter changes by varying the excitation voltage parameter over time. Different voltage levels and sequences are applied to the sensor to detect different chemical species. For example, a first voltage level may detect hydrocarbons while a second voltage level may detect aldehydes. This parameter variation enables the system to identify multiple contaminants using a single sensor type, resolving the contradiction between operational simplicity and measurement precision.
2Measurement precision
If multiple sensor types are deployed to identify specific contaminants, then measurement precision and contaminant identification capability are improved, but device complexity increases
Solution Approach 1:
The patent applies universality by enabling a single sensor type (metal oxide sensor) to perform multiple detection functions. By applying different voltage sequences and analyzing different sensor responses, the system can identify various chemical species including hydrocarbons, aldehydes, and other contaminants. This multi-functionality approach allows the system to achieve high measurement precision for multiple contaminants without deploying multiple specialized sensors, thus maintaining simpler device architecture.
Solution Approach 2:
The patent uses parameter changes to enable a single sensor to detect multiple chemical species. Different excitation voltage parameters (first voltage, second voltage, third voltage at different time points) are applied to the sensor, and the resulting sensor responses are analyzed to identify specific contaminants. This approach eliminates the need for multiple sensor types while maintaining the ability to detect and identify various VOCs and aldehydes, thereby reducing device complexity while preserving measurement precision.
3Device complexity
If manual detection by pilots or occupants is required, then device complexity is reduced, but the response time increases and safety is compromised due to prolonged exposure
Solution Approach 1:
The patent implements self-service by enabling the sensor system to automatically detect, identify, and alert about contaminant presence without requiring manual inspection by pilots or occupants. The system autonomously applies voltage sequences, analyzes sensor responses, compares results against reference data, and can trigger alerts or corrective actions. This automation eliminates the time delay associated with manual detection while maintaining relatively simple device complexity, directly addressing the safety concerns related to prolonged exposure.
Solution Approach 2:
The patent incorporates feedback mechanisms where sensor responses are continuously monitored, compared against reference data or thresholds, and used to trigger appropriate responses. The system provides real-time feedback about contaminant levels and can automatically initiate corrective actions such as adjusting ventilation or alerting occupants. This feedback loop eliminates the need for manual detection while maintaining system simplicity, significantly reducing response time and improving safety.
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 effectively detects and responds to changing contaminant levels, ensuring occupant safety and comfort by continuously monitoring air quality and adjusting ventilation to maintain safe thresholds for VOCs, aldehydes, and other harmful substances, reducing exposure risks and improving flight and building safety.
Implementation Method 1
A system comprising a controller and an array of sensors, including cyclic voltammetry, catalytic combustion, and conductometric sensors
Implementation Method 2
A system comprising a controller and an array of sensors, including cyclic voltammetry, catalytic combustion, and conductometric sensors
Implementation Method 3
A system comprising a controller and an array of sensors, including cyclic voltammetry, catalytic combustion, and conductometric sensors
Implementation Method 4
It is known that increasing or decreasing metal oxide sensor voltage may change the sensor response to a specific chemical
Data Source
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AI summary
An environmental control system (ECS) having contaminants in supply air that flows into an environment includes an outside air contaminant component that senses contaminants in outside air, wherein the outside air contaminant component is upstream of the environment, A recirculated air contaminant component is provided and that senses contaminants in recirculated air supplied by the environment, wherein the recirculated air contaminant component is downstream of the environment. A voltage supply provides a non-linear variable voltage to at least one of the components. A controller is in communication with the components and the voltage supply; wherein, upon a measured resistance, from at least one of the components, that exceeds a threshold, the controller varies at least one of an outside air flow and a recirculated air flow in the ECS.