Gas Sensor System with Periodic Temperature Modulation
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Solution Overview
Problem
Existing gas sensor systems face challenges in accurately measuring gas concentrations due to signal interference from competing gases, leading to reduced selectivity and sensitivity, especially when dealing with gas mixtures or aerosols.
Innovation Solution
A sensor system with a heatable measuring area and gas-permeable structure, where the temperature is modulated to alter gas concentrations, allowing for increased sensitivity and selectivity by measuring resistance changes at different temperatures, and optionally using a catalyst to convert gases into easier-to-detect forms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If metal oxide sensors are used to detect individual gases in specific temperature ranges, then signal strength is improved, but selectivity deteriorates due to signal superposition from competing gases
Solution Approach 1:
The patent applies periodic heating cycles to the measuring area, alternating between heating phases (to enhance signal strength from target gases) and cooling phases (to reduce interference from competing gases). This periodic temperature modulation allows the sensor to selectively detect target gases while minimizing signal superposition from interfering gases, thereby resolving the contradiction between signal strength and selectivity
Solution Approach 2:
The patent changes the temperature parameter of the measuring area dynamically during measurement. By heating the measuring area to specific temperatures, the sensor optimizes detection for target gases while suppressing responses from interfering gases. This parameter change enables the sensor to maintain high signal strength for target gases while achieving improved selectivity against competing gases
2Measurement precision
If the measuring area is heated to increase gas concentration changes for sensitivity, then sensitivity is improved, but energy consumption increases
Solution Approach 1:
The patent uses periodic heating instead of continuous heating, where the measuring area is heated only during specific measurement phases when sensitivity is needed, and cooled during other phases. This periodic action maintains high sensitivity for gas concentration detection while significantly reducing overall energy consumption compared to continuous heating approaches
Solution Approach 2:
The patent dynamically adjusts the temperature of the measuring area based on measurement requirements. The temperature is modulated to coincide with measurement cycles, providing high sensitivity only when needed rather than maintaining constant high temperature. This dynamic temperature control optimizes the balance between sensitivity and energy consumption
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
This approach enhances the accuracy and selectivity of gas concentration measurements by manipulating gas concentrations through temperature changes and catalyst conversion, effectively addressing signal interference and improving detection capabilities across various gas samples.
Implementation Method 1
The measuring area is initially heated up, the heating is then switched off and the change in resistance of the at least one gas sensor is measured
Implementation Method 2
a diffusion opening which is closed by a gas-permeable structure
Implementation Method 3
The gases from the gas sample are at least partly converted by the catalyst arrangement into other gases, which are either easier to detect by the gas sensor
Implementation Method 4
the change in resistance of the at least one gas sensor is measured
Data Source
AI summary
In an embodiment a sensor system includes a carrier implemented as one of a ceramic carrier, a printed circuit board or a transistor outline header, a measuring area semiconductor body implemented as a first micromechanical component, a gas sensor implemented as a second micromechanical component and including an electrode assembly, a sensitive layer and a sensor membrane that spans a recess, wherein the measuring area semiconductor body and the gas sensor are connected to each other, a further sensor with a further electrode assembly and a further sensitive layer, wherein the further sensor is a further gas sensor or a humidity sensor, and a measuring area filled by the gas sample and arranged between the measuring area semiconductor body and the gas sensor, wherein the gas in the measuring area is in contact with the gas sensor and the further sensor.