Gas Sensor Compensation Using a Reference Element for Ambient Drift
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Solution Overview
Problem
Existing gas measuring devices struggle to accurately measure target gas concentrations due to the influence of ambient conditions such as temperature, humidity, and pressure without requiring additional sensors for these conditions.
Innovation Solution
A gas measuring device and method that uses a detector and a compensator to measure target gas concentrations, where the compensator's detection value is less affected by ambient conditions, allowing computational compensation for these influences, and operates in different modes to adapt to specific conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors are used to measure ambient conditions (temperature, humidity, pressure), then compensation accuracy for ambient conditions improves, but device complexity and cost increase
Solution Approach 1:
The patent combines the ambient condition sensing function into the compensator element itself. The compensator is exposed to ambient conditions and generates compensation signals directly, merging the sensing and compensation functions into a single component rather than using separate sensors for each ambient condition.
Solution Approach 2:
The compensator serves multiple functions: it compensates for different ambient conditions (temperature, humidity, pressure) simultaneously and provides signals for both linear and non-linear compensation. This multi-functionality eliminates the need for multiple dedicated sensors for each ambient parameter.
2Measurement precision
If multiple sensors for ambient conditions are installed, then compensation capability improves, but reliability decreases due to more potential failure points
Solution Approach 1:
By merging the ambient condition sensing into the compensator, the system reduces the total number of separate sensing components. Fewer independent sensors mean fewer potential failure points, thereby improving overall system reliability while maintaining compensation capability.
Solution Approach 2:
The compensator serves itself by being exposed to ambient conditions and automatically generating compensation signals. This self-service mechanism eliminates the need for additional dedicated sensors that would introduce more failure risks.
3Ease of operation
If a compensator reacts similarly to ambient conditions as the detector, then computational compensation becomes possible, but the compensator may also react to target gas reducing measurement accuracy
Solution Approach 1:
The patent extracts the target gas response component from the compensator's total signal. By measuring what the compensator does NOT respond to target gas (or responds to minimally), the system isolates the ambient condition effects for compensation while preserving accurate target gas measurement through the detector.
Solution Approach 2:
The compensator provides feedback signals about ambient conditions that are used to adjust and correct the detector's target gas measurements. This feedback mechanism enables computational compensation where the compensator's ambient condition responses are used to refine the final measurement accuracy.
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 device provides estimated target gas concentrations with minimal deviation from actual values, reducing the need for additional sensors and enabling accurate measurements across varying environmental conditions.
Implementation Method 1
A detector is heated and heats a gas sample in a measuring chamber. The heating of the gas sample leads to the oxidation of combustible target gas in the gas sample. The oxidation releases heat energy.
Implementation Method 2
The heating of the gas sample leads to the oxidation of combustible target gas in the gas sample. The oxidation releases heat energy.
Implementation Method 3
A compensator for at least one ambient condition is provided. The compensator has a measurable compensator detection quantity. The compensator detection quantity correlates less than the detector detection quantity, or even not at all, with the desired target gas concentration.
Data Source
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AI summary
The invention relates to a gas measuring device (100) and a gas measuring method capable of measuring the concentration of a target gas. A detector detection variable sensor (12.1) measures a detection variable (U10) of a detector, wherein this detector detection variable (U10) correlates with the concentration of the target gas in a gas sample (Gp). A compensator detection variable sensor (12.2) measures a detection variable (U11) of a compensator, wherein this compensator detection variable (U11) correlates less with the target gas concentration. The gas measuring device (100) can be operated in a pressure-compensating mode and/or in a humidity-compensating mode. In pressure-compensating mode, the influence of ambient pressure on a measurement result is compensated as best as possible under the boundary condition that the influence of ambient humidity remains sufficiently small.In the humidity compensating mode, the influence of ambient humidity on a measurement result is compensated as best as possible under appropriate boundary conditions.