Gas Sensor Calibration via Peer-to-Peer Wireless Data Exchange
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Solution Overview
Problem
Gas sensors face challenges in maintaining accurate measurements over time due to changing characteristics, especially when transitioning between outdoor and indoor environments, where self-calibration is difficult, especially when CO2 concentrations do not reach reference values like 400 ppm, even during low activity periods like late at night.
Innovation Solution
A gas sensor system comprising a first gas sensor apparatus and a second gas sensor apparatus that calibrate each other's measurements using calibration information transmitted wirelessly, with the first gas sensor apparatus calibrating its measurements based on reference values and transmitting this information to the second gas sensor apparatus, ensuring accurate CO2 concentration readings even in environments where self-calibration is challenging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If gas sensors are used for long-term measurement, then measurement duration increases, but measurement precision deteriorates due to changing sensor characteristics
Solution Approach 1:
The system performs preliminary calibration actions at predetermined intervals by transmitting calibration information between devices. This preliminary calibration maintains measurement precision over extended periods by proactively correcting sensor drift before it significantly degrades accuracy.
Solution Approach 2:
The system implements feedback through bidirectional calibration information exchange between gas sensor devices. Each device receives calibration information from others, creating a feedback loop that continuously adjusts and maintains measurement precision across the network of sensors over time.
2Adaptability or versatility
If gas sensors transition between outdoor and indoor environments, then adaptability increases, but measurement precision deteriorates due to difficulty in self-calibration
Solution Approach 1:
The system uses other gas sensor devices as intermediaries for calibration. Instead of relying on self-calibration which fails in indoor environments, each device uses calibration information transmitted from other devices in the network, enabling accurate measurements across diverse environments including indoor spaces where CO2 levels don't reach reference values.
3Adaptability or versatility
If gas sensors operate in indoor environments with varying CO2 levels, then versatility increases, but self-calibration capability deteriorates
Solution Approach 1:
The system enables self-service calibration through peer-to-peer calibration information exchange. Each gas sensor device automatically receives and applies calibration information from other devices in the network, maintaining measurement accuracy in indoor environments without requiring manual intervention or traditional self-calibration methods that depend on reaching reference CO2 levels.
Data Source
AI summary
There is provided a gas sensor system including a first gas sensor apparatus including a transmission unit configured to transmit first calibration information and reliability information of the first gas sensor apparatus, and a second gas sensor apparatus including a reception unit configured to receive the first calibration information and the reliability information and a calibration unit configured to calibrate, based on the first calibration information, a gas concentration of a second gas sensor, in which when the calibration reliability of the first gas sensor apparatus is higher than a reference calibration reliability, the calibration unit is configured to calibrate, based on the first calibration information, the gas concentration of the second gas sensor.