Sensor Module Load Resistance Adjustment for Gas Concentration
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Solution Overview
Problem
Semiconductor gas sensors exhibit sensitivity variations due to errors and contamination, leading to inconsistent gas concentration measurements and reduced reliability.
Innovation Solution
A sensor module with a processor that adjusts the load resistance value based on electrical conductivity changes, using a load resistor connected to the sensor, to normalize gas concentration calculations across different sensor sensitivities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If semiconductor sensors are used to detect gas concentration, then gas detection capability is provided, but sensitivity variations cause gas concentration scattering and reduced measurement reliability
Solution Approach 1:
The patent changes the electrical parameter (load resistance value) dynamically to compensate for sensor sensitivity variations. By adjusting the load resistance based on detected sensitivity deviations, the system normalizes the output signal and eliminates gas concentration scattering caused by manufacturing tolerances and contamination.
Solution Approach 2:
The system implements a feedback mechanism where the processor continuously monitors the sensor output, detects sensitivity variations, and automatically adjusts the load resistance value to compensate. This closed-loop control ensures consistent gas concentration measurements despite sensor drift or manufacturing differences.
2Measurement precision
If load resistance value is adjusted to compensate for sensitivity variations, then measurement consistency is improved, but device complexity increases
Solution Approach 1:
The system performs self-calibration by automatically detecting its own sensitivity variations and adjusting the load resistance without external intervention. The processor monitors the sensor output and autonomously modifies the circuit parameters to maintain measurement consistency, eliminating the need for manual calibration or complex external control systems.
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 solution reduces gas concentration scattering and improves measurement reliability by adjusting the load resistance value, ensuring consistent gas concentration readings despite sensitivity differences in semiconductor sensors.
Implementation Method 1
when air is clean, electron in the sensing material 3 may combine with oxygen adsorbed on the surface of the sensing material 3
Implementation Method 2
oxygen adsorbed on the surface of the sensing material 3 may combine with the gas in the air to cause a reduction reaction on the surface of the sensing material 3
Implementation Method 3
the semiconductor sensor may use a change in electrical conductivity that occurs when a gas is brought into contact with a surface of a ceramic semiconductor
Data Source
AI summary
A sensor module includes a sensor configured to sense gas in air, a load resistor connected to the sensor, and a processor configured to determine a gas concentration of the gas in the air based on an internal resistor of the sensor and the load resistor. The processor is configured to obtain an electrical conductivity change amount of the sensor and adjust a load resistance value of the load resistor based on the electrical conductivity change amount.