Gas Sensor Self-Calibration via Baseline Offset Update
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Gas sensing devices face challenges with sensor drift over time, leading to inaccurate concentration measurements due to temporal variations, which are not addressed by existing technologies that rely on external reference data or connectivity.
Innovation Solution
A gas sensing device and method that compensates for measurement signal drift by updating an offset based on samples where the target gas concentration is below a threshold, allowing for independent long-term operation without external data or connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gas sensing devices operate for long periods, then productivity is maintained, but measurement precision deteriorates due to sensor drift
Solution Approach 1:
The gas sensing device performs self-calibration by automatically detecting baseline conditions and updating offset values without external intervention. The processing module identifies samples where target gas concentration is below a threshold and uses these to recalculate and update the offset, enabling the device to correct its own drift and maintain measurement accuracy over extended operation periods
Solution Approach 2:
The system implements feedback by continuously monitoring measurement signals and using samples with low target gas concentration to adjust the offset. This closed-loop approach allows the device to detect when drift occurs and automatically correct it, maintaining measurement precision throughout the operational period
2Measurement precision
If external reference data or connectivity is used for calibration, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The gas sensing device performs self-calibration by automatically detecting baseline conditions and updating offset values without external intervention. The processing module identifies samples where target gas concentration is below a threshold and uses these to recalculate and update the offset, enabling the device to correct its own drift and maintain measurement accuracy over extended operation periods
Solution Approach 2:
The invention extracts the calibration function from external reference systems and embeds it within the device itself. By using internal measurement samples with low target gas concentration, the device can perform offset updates independently, eliminating the need for external reference sensors or connectivity while maintaining measurement precision
Data Source
AI summary
A gas sensing device for sensing a target gas in a gas mixture comprises: a measurement module configured for obtaining a sampled measurement signal, the sampled measurement signal being responsive to a concentration of the target gas in the gas mixture; a compensation module configured for compensating the sampled measurement signal using an offset information to obtain a compensated measurement signal; a processing module configured for detecting a sample of the sampled measurement signal, which sample fulfils a set of one or more criteria, and wherein a first criterion of the set of criteria is fulfilled if, according to an evaluation of the sampled measurement signal, the sample is associated with a concentration of the target gas below a threshold, and updating the offset information based on a sample which fulfills the set of criteria.