Integrated Pellistor Sensor for Humidity Compensation
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Solution Overview
Problem
Miniaturized gas sensors, particularly thermal conductivity pellistors, face challenges in measuring gas concentrations accurately due to strong dependence on ambient humidity and temperature changes, lacking effective integrated reference solutions.
Innovation Solution
A sensor device comprising multiple pellistor elements with integrated heater and temperature sensor components, where each pellistor element can be either catalytic or thermal conductivity type, and a substrate with membranes and cover layers to create sealed cavities for gas exposure, allowing for a miniaturized and integrated reference pellistor to compensate for environmental changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reference pellistor is integrated on the same substrate as the catalyst pellistor, then humidity and temperature effects can be compensated, but the device complexity increases due to the need for separate reference pellistor structure
Solution Approach 1:
The patent merges the reference pellistor and catalyst pellistor into a single integrated structure where the catalyst pellistor serves dual functions: as the active sensing element and as the reference element. The catalyst layer is configured such that it provides both catalytic combustion function and reference measurement function, eliminating the need for a separate reference pellistor structure while maintaining compensation capability for environmental effects
Solution Approach 2:
The catalyst pellistor is designed to perform multiple functions simultaneously: it acts as both the active sensing element for gas detection and the reference element for environmental compensation. This multi-functional design allows a single structure to replace what would traditionally require separate reference and active pellistors, reducing device complexity while maintaining reliability
2Volume of moving object
If miniaturized gas sensors are used, then the sensor size is reduced for consumer applications, but the sensitivity to environmental changes increases
Solution Approach 1:
The patent combines the active sensing function and reference compensation function into a single miniaturized catalyst pellistor structure. By making the catalyst pellistor serve as both active and reference element, the sensor achieves environmental compensation without requiring additional space for separate reference components, thus maintaining miniaturization while reducing sensitivity to environmental changes
Solution Approach 2:
The integrated catalyst pellistor provides real-time feedback on environmental conditions through its dual functionality. The reference measurement capability within the miniaturized structure enables continuous monitoring and compensation of humidity and temperature effects, allowing the sensor to maintain accuracy despite its small size
Data Source
AI summary
In an embodiment a sensor device includes a substrate with a first membrane and a first cover layer, the first membrane and the first cover layer being monolithically integrated into the substrate and a first pellistor element including a heater element and a temperature sensor element, the heater element and/or the temperature sensor element being arranged in or on the first membrane, wherein the first cover layer is arranged over or under the first membrane, and wherein the first membrane, the first cover layer and a part of the substrate surround a first cavity.