Sorption Sensor Array for Gas Concentration Estimation
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Solution Overview
Problem
Existing gas detecting sensors are inadequate for accurately detecting low concentrations of gases like sulfur dioxide in closed environments, such as space stations, and fail to provide reliable concentration estimates for industrial applications, where threshold levels are critical.
Innovation Solution
A sensor system with a sensor array and microcontroller that measures resistance changes in a sorption-based film, using activated charcoal filters and humidity correction to detect and estimate gas concentrations, employing signal processing techniques to identify analytes and correct for environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional gas detecting sensors are used, then the device complexity is low, but the measurement precision for low concentration gases is insufficient
Solution Approach 1:
The system divides the detection task into multiple specialized sensors arranged in an array, each potentially sensitive to different gas types or concentration ranges. This segmentation allows the system to achieve high measurement precision for low concentration gases while maintaining manageable complexity through modular architecture
Solution Approach 2:
The patent introduces activated charcoal filters as intermediary components between the gas sample and the sensors. These filters selectively adsorb interfering substances, allowing the sensors to focus on detecting target gases at low concentrations with improved accuracy without requiring overly complex sensor designs
2Measurement precision
If activated charcoal filters are added for gas detection, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The activated charcoal filters perform preliminary purification of the gas sample before it reaches the sensors. By pre-removing interfering substances, the filters enable more accurate concentration measurements without requiring the sensors themselves to be overly complex or specialized
Solution Approach 2:
The patent utilizes activated charcoal, a porous material with high surface area, to selectively adsorb gas molecules. This well-established material provides effective gas separation and purification with relatively simple implementation, improving measurement precision without proportionally increasing device complexity
3Reliability
If humidity correction is implemented, then the reliability of gas concentration detection improves, but the device complexity increases
Solution Approach 1:
The system implements humidity correction through feedback mechanisms that monitor environmental conditions and adjust sensor readings accordingly. By continuously measuring humidity levels and applying correction algorithms, the system maintains high detection reliability while using software-based solutions rather than additional hardware components
4Measurement precision
If a sensor array is used instead of single sensor, then the measurement precision for low concentration gases improves, but the device complexity increases
Solution Approach 1:
The sensor array segments the detection function across multiple sensors, with each sensor potentially optimized for different detection tasks. This division allows the system to achieve superior measurement precision for low concentration gases while maintaining manageable complexity through modular, scalable architecture
Solution Approach 2:
The sensor array is designed with multi-functionality, where sensors can detect various gas types and concentration ranges. This universal approach allows a single array configuration to handle multiple detection scenarios, improving measurement precision across different applications without proportionally increasing overall system complexity
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 estimates gas concentrations, providing accurate identification and quantification of gases, even at low levels, by processing resistance changes and correcting for humidity and other environmental factors, ensuring safe and efficient industrial processes.
Implementation Method 1
measures resistance changes in a sorption-based film
Implementation Method 2
measures resistance changes in a sorption-based film
Implementation Method 3
using activated charcoal filters
Data Source
AI summary
A sensor system for detecting and estimating concentrations of various gas or liquid analytes. In an embodiment, the resistances of a set of sensors are measured to provide a set of responses over time where the resistances are indicative of gas or liquid sorption, depending upon the sensors. A concentration vector for the analytes is estimated by satisfying a criterion of goodness using the set of responses. Other embodiments are described and claimed.