Abstract
The paper presents results concerning the effect of spatial inhomogeneous operating temperature on the gas discrimination power of a gas-sensor microarray, with the latter based on a thin SnO2 film employed in the KAMINA electronic nose. Three different temperature distributions over the substrate are discussed: a nearly homogeneous one and two temperature gradients, equal to approx. 3.3 oC/mm and 6.7 oC/mm, applied across the sensor elements (segments) of the array. The gas discrimination power of the microarray is judged by using the Mahalanobis distance in the LDA (Linear Discrimination Analysis) coordinate system between the data clusters obtained by the response of the microarray to four target vapors: ethanol, acetone, propanol and ammonia. It is shown that the application of a temperature gradient increases the gas discrimination power of the microarray by up to 35 %.
Highlights
There is a growing demand for simple instruments capable of classifying complex gas ensembles that odors or flavors usually are [1]
The KAMINA, a microsystem electronic nose developed at the Karlsruhe Research Center, utilizes a single metal-oxide thin film segmented by electrodes to create a gas sensor microarray [7,8]
The response of the array operated under nearly homogeneous temperature conditions and the two temperature gradients of 3.3 oC/mm and 6.7 oC/mm, to ethanol, acetone, propanol and ammonia have been analyzed by Linear Discriminant Analysis
Summary
There is a growing demand for simple instruments capable of classifying complex gas ensembles that odors or flavors usually are [1]. The KAMINA, a microsystem electronic nose developed at the Karlsruhe Research Center, utilizes a single metal-oxide thin film segmented by electrodes to create a gas sensor microarray [7,8]. The effect of the spatial variation of the operating temperature applied across the segmented metal-oxide thin film is thoroughly studied in order to improve the gas discrimination power of the KAMINA system.
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