MEMS Gas Sensor Element for Multi-Component Concentration Measurement
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Solution Overview
Problem
Conventional thermal conductivity sensors are limited to determining a single gas component concentration and are affected by deviations due to ambient pressure, requiring additional sensor units or types for multi-component gas concentration measurements.
Innovation Solution
A sensor device with a sensor element comprising a cavity, a measuring component, and a heating component, controlled by a circuit arrangement to measure temperature changes and determine gas component concentrations using heat characteristics, employing MEMS technology to minimize self-heating and enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional thermal conductivity sensors are used to measure gas concentration, then the measurement can be performed with a single sensor unit, but the sensor is limited to determining only a single gas component concentration and is affected by deviations due to ambient pressure
Solution Approach 1:
The sensor element is divided into multiple independent sensor units, each equipped with its own heating component and measuring component. Each sensor unit can be configured to detect specific gas components, allowing the system to determine concentrations of multiple gas components simultaneously while maintaining measurement precision for each component through dedicated sensing elements.
2Adaptability or versatility
If additional sensor units or alternative sensor types are used to determine multiple gas components, then the versatility improves, but the device complexity increases
Solution Approach 1:
Multiple sensor units are integrated into a single sensor element structure, combining several detection functions within one unified device. The sensor element houses multiple heating components and measuring components that work together to detect different gas components, reducing the need for separate sensor units and alternative sensor types while maintaining multi-component detection capability.
3Measurement precision
If thermal conductivity measurement is performed, then gas concentration can be determined, but the measurement is highly dependent on ambient pressure causing deviations
Solution Approach 1:
The sensor element incorporates reference components that experience similar pressure effects as the measuring components. By comparing the signals from the measuring components against the reference components, the system can compensate for ambient pressure variations and other environmental factors, maintaining measurement precision despite changes in ambient conditions.
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 reliable and accurate multi-component gas concentration measurements, reducing resource consumption and contributing to green technology by improving hydrogen detection in automotive and industrial applications.
Implementation Method 1
The control circuit arrangement is set up to heat the first heating component by applying an electric heating voltage during a heating phase
Implementation Method 2
measuring temperature changes at the first measuring component as a function of the heating during the heating phase
Data Source
AI summary
A sensor device for measuring a gas concentration includes a sensor element including a cavity having an opening for receiving a gas, a first measuring component and a first heating component arranged in the cavity in each case. The sensor element further includes a control circuit arrangement which is electrically coupled with the sensor element and set up to control operation of the sensor element, wherein the control circuit arrangement is set up to heat the first heating component by applying an electric heating voltage during a heating phase, to measure temperature changes at the first measuring component as a function of the heating during the heating phase, to ascertain a heat characteristic of the gas from the temperature changes, and to determine a concentration of a component of the gas from the heat characteristic that is ascertained.