Abstract
The electric conductivity of point-contact multistructured sensors in a complex medium of the human breath gas has been studied. Considering a large number of parameters which characterize response curves of point-contact sensors, we proved the possibility of using a statistical procedure to assess the reproducibility of sensor operation. To select sensors with similar parameters from a studied set of sensors, the method of cluster analysis was employed. As a result, we first propose a criterion for selection of uniform sensors from sample sets based on sensing arrays, each containing over 200 point-contact sensing elements. We demonstrate the effectiveness of the proposed approach for the selection of uniform sensors in experiments with breath gas exhaled by a volunteer. In this case, pairs of random elements from the formed cluster show a good reproducibility of their sensor images. The selected elements are thus proved to be uniform samples which can be used to study complex gas media, for example, in clinical practice to develop methods of noninvasive diagnosis based on breath analysis.
Highlights
An obligatory part of the process of samples creation and their further utilization in Yanson point-contact spectroscopy is selection of suitable ones among a set of prepared point contacts using the accepted quality criteria [1]
We first propose a criterion for selection of uniform sensors from sample sets based on sensing arrays, each containing over 200 point-contact sensing elements
We studied electric conductivity of point-contact sensors in a complex multicomponent medium of gas exhaled by a person
Summary
An obligatory part of the process of samples creation and their further utilization in Yanson point-contact spectroscopy is selection of suitable ones among a set of prepared point contacts using the accepted quality criteria [1]. Point contacts with reproducible parameters can be produced by using appropriate procedures These samples are suitable for both investigations of their own properties and study of various physical effects [2]. The discovery of the point-contact gas-sensitive effect [3] has raised a number of new problems which have to be solved in order to enable further progress of the method of Yanson point-contact spectroscopy. One of them is development of new criteria and procedures which could help to effectively characterize point-contact sensitive elements at room temperatures. There is a vital need for further development of this important procedure in the technology of Yanson point-contact spectroscopy and its application in the area of point-contact gas-sensitive effect at room temperatures
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