Differential Gas Sensor Reference Correction for Negative Drift
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Solution Overview
Problem
Existing gas sensors suffer from negative drift, leading to calculation errors in gas concentration measurements due to temporal changes, which are not adequately addressed by current technologies.
Innovation Solution
A gas sensor design that includes a sensor part, differential amplifier, and control circuit to generate and correct a differential signal, adjusting the reference voltage when the concentration falls below a threshold to cancel the negative drift, ensuring accurate measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a differential amplifier is used to amplify the detection signal, then the measurement precision is improved, but negative drift occurs leading to calculation errors in gas concentration measurements
Solution Approach 1:
The control circuit continuously monitors the differential signal level and automatically adjusts the reference voltage to maintain the differential signal within the optimal range. This feedback mechanism compensates for negative drift by detecting when the gas concentration falls below the threshold and correcting the reference voltage accordingly, ensuring reliable and precise measurements over time
Solution Approach 2:
The system dynamically changes the reference voltage parameter in response to detected negative drift. When the differential signal level indicates gas concentration below threshold, the control circuit adjusts the reference voltage to restore the differential signal to the proper range, thereby maintaining measurement precision and eliminating calculation errors
2Device complexity
If the reference voltage is kept constant, then the device complexity is reduced, but measurement accuracy deteriorates due to negative drift
Solution Approach 1:
The control circuit automatically performs reference voltage correction without external intervention. When negative drift is detected through the differential signal level, the system self-corrects by adjusting the reference voltage to maintain accurate measurements, eliminating the need for manual calibration or complex external control mechanisms
Solution Approach 2:
The automatic feedback loop monitors the differential signal and adjusts the reference voltage accordingly. This self-regulating mechanism maintains measurement accuracy while keeping the device structure relatively simple, as the correction process is autonomously managed by the control circuit based on real-time signal levels
Data Source
AI summary
Disclosed herein is a gas sensor that includes: a sensor part configured to generate a gas detection signal according to a concentration of a gas to be measured; a differential amplifier configured to amplify a difference between the gas detection signal and a reference voltage to generate a differential signal; and a control circuit configured to generate an output signal indicating the concentration of the gas to be measured based on the differential signal. When the concentration of the gas to be measured falls below a threshold value corresponding to a level of the differential signal that is determined to be a concentration of the gas to be measured under normal conditions, the control circuit is configured to correct the reference voltage.