Dual Gas Sensor Segmentation for Concentration Precision
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Solution Overview
Problem
Existing gas sensors face challenges in accurately measuring target gas concentrations, particularly in determining threshold concentrations, due to limitations in sensitivity and error rates across varying concentration bands.
Innovation Solution
A sensor design featuring two separate gas sensitive components with distinct metal oxide semiconductor layers, optimized for specific concentration bands, operating in a transition regime between perturbation and saturation regimes to enhance measurement accuracy and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single gas sensitive layer is used to measure target gas concentration, then the device complexity is low, but the measurement precision deteriorates across varying concentration bands
Solution Approach 1:
The patent divides the gas sensing function into multiple gas sensitive layers (first gas sensitive layer and second gas sensitive layer), each optimized for different concentration bands. The first layer measures lower concentration bands while the second layer measures higher concentration bands, allowing high precision across the full measurement range without requiring a single complex sensor design
Solution Approach 2:
Each gas sensitive layer is designed with specific local properties: different thicknesses, different metal oxide semiconductor materials or compositions, and different operating temperatures. These localized optimizations enable each layer to excel at measuring its designated concentration band, improving overall measurement precision while maintaining manageable device complexity
2Reliability
If the gas sensitive layer operates in saturation regime, then the measurement range is wide, but the sensitivity deteriorates
Solution Approach 1:
The patent segments the concentration measurement range into multiple bands, with each gas sensitive layer responsible for a specific band. This allows each layer to operate in its optimal regime (transition regime for high sensitivity) while collectively covering a wide concentration range, resolving the contradiction between sensitivity and measurement range
Solution Approach 2:
The system dynamically selects which gas sensitive layer to use based on the current concentration level. By switching between layers operating in transition regime, the system maintains high sensitivity across the full measurement range while adapting to different concentration conditions, rather than being stuck in a fixed saturation regime
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 sensor achieves improved measurement accuracy and reduced error rates by optimizing each gas sensitive component for its respective concentration band, with n-doped or p-doped metal oxide semiconductor materials showing increased sensitivity to oxidizing or reducing gases like ozone and nitrogen dioxide.
Implementation Method 1
one or more heating elements configured to heat the first gas sensitive layer and the second gas sensitive layer
Implementation Method 2
Gas sensors are based on the concept that gaseous analytes interact with a gas sensitive layer, in particular a metal oxide layer, at elevated temperatures of the gas sensitive layer in the range of more than 100° Celsius. As a result of a catalytic reaction between the gaseous analyte and the gas sensitive layer, the conductivity of the gas sensitive layer may change
Implementation Method 3
n-doped or p-doped metal oxide semiconductor materials showing increased sensitivity to oxidizing or reducing gases like ozone and nitrogen dioxide
Implementation Method 4
n-doped or p-doped metal oxide semiconductor materials showing increased sensitivity to oxidizing or reducing gases like ozone and nitrogen dioxide
Data Source
Figure 1A~1C
Figure 2a~2c
Figure 3~5
AI summary
The disclosure relates to a sensor for measuring a gas concentration of a target gas in a sample of ambient air. The sensor comprises a first gas sensitive component (110) comprising a first gas sensitive layer (111) being arranged between a first pair of measuring electrodes (160), a second gas sensitive component (120) comprising a second gas sensitive layer (121) being arranged between a second pair of measuring electrodes (161) and one or more heating elements (135) to heat the first gas sensitive layer (111) and the second gas sensitive layer (121). The first gas sensitive component (110) is configured to measure the gas concentration of the target gas in a first concentration band and the second gas sensitive component (120) is configured to measure the gas concentration of the target gas in a second concentration band. Further aspects of the disclosure relate to a corresponding method, a computer program product and an electronic device.