Gas Sensor Calibration via Reference Station Comparison
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Solution Overview
Problem
Existing gas sensors deployed in urban or peri-urban environments for air pollution monitoring are difficult to calibrate accurately in the field, especially when numerous sensors are required, as traditional calibration methods involve moving sensors to a laboratory, which is impractical for large numbers.
Innovation Solution
A method for calibrating gas sensors in situ using data from reference stations, where the sensors are associated with selected reference stations, and analyte concentrations are estimated and compared to calibrate the sensors, potentially using a neural network for correlation and selecting optimal calibration time slots when emissions are minimal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional laboratory calibration methods are used for gas sensors, then measurement accuracy is improved, but the complexity and cost of deploying numerous sensors increases significantly
Solution Approach 1:
The patent uses reference stations as intermediary devices that provide known reference measurements of analyte concentrations. These reference stations act as mediators between the distributed gas sensors and the calibration process, allowing sensors to be calibrated indirectly through comparison with reference measurements rather than requiring direct exposure to standard gases in a laboratory setting.
Solution Approach 2:
The patent creates virtual copies of laboratory calibration conditions by using reference stations that simulate known analyte concentration environments. Instead of physically moving sensors to a laboratory, the system copies the essential calibration function through reference measurements taken at distributed locations, enabling in-situ calibration that replicates laboratory accuracy.
2Measurement precision
If numerous gas sensors are deployed to capture local pollution variations, then spatial resolution of pollution maps is improved, but the feasibility of calibrating each sensor individually decreases
Solution Approach 1:
The patent enables gas sensors to perform self-calibration by automatically comparing their measurements with reference measurements from nearby reference stations. The calibration process occurs autonomously without requiring manual intervention, sensor retrieval, or laboratory processing, allowing numerous sensors to be calibrated simultaneously through automated data comparison and adjustment algorithms.
Solution Approach 2:
The patent establishes reference stations in advance at strategic locations throughout the deployment area. These reference stations are pre-configured with known measurement capabilities and serve as ready-made calibration references before the actual sensor deployment and calibration process begins, enabling rapid scaling to numerous sensors without increasing calibration complexity.
3Ease of operation
If reference stations are used for sensor calibration, then calibration accessibility is improved, but the distance between reference stations and sensors increases measurement uncertainty
Solution Approach 1:
The patent applies local quality by selecting and associating each gas sensor with specific reference stations based on their spatial relationship and environmental similarity. The calibration process is localized to pairs or groups of sensors and their nearest reference stations, ensuring that calibration references are as locally representative as possible while maintaining the benefits of distributed reference station deployment.
Data Source
AI summary
A method for calibrating a gas sensor includes associating a reference station with the gas sensor, the latter belonging to a network of sensors distributed between various positions in a geographical region and being configured to measure a concentration of an analyte in the air at various measurement times. The geographical regions comprises reference station(s) remote from the gas sensor and configured to measure, at various reference times, a concentration of the analyte in the air. During a calibration time slot, an analyte concentration is measured with the gas sensor, taking into account an analyte concentration measured by the reference station associated with the gas sensor. From the analyte concentration measured by the reference station in the calibration time slot, an analyte concentration in the position of the gas sensor is estimated. The estimated analyte concentration and the analyte concentration measured by the gas sensor are compared.