Abstract
The gas sensor research presented here has a focus on the measurement of the composition of natural gas and gases from sustainable resources, such as biogas. For efficient and safe combustion, new sensor systems need to be developed to measure the composition of these new gases. In general about 6 gas components need to be measured to determine the caloric value and the combustion properties of these gas mixtures. The concentration levels of the relevant components are relatively high, and the emphasis of this research work is therefore on selectivity and avoidance of cross contamination. For this reason and because of their limited stability, chemical sensors are not considered. The sensors in this work are based on physical interaction with the gas. One single sensing principle is insufficient for identification of all components in the natural gas and a microsystem for measuring three different physical properties of the gas components are proposed in this work: thermal conductivity, optical and photo-acoustic infrared absorption.
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