GAS IDENTIFICATION ON THE BASIS OF MICROCOMPUTER ANALYSIS OF POROUS SILICON SENSOR DATA
Journal Title: Сенсорна електроніка і мікросистемні технології - Year 2016, Vol 13, Issue 3
Abstract
The paper deals with the problem of detecting the combustible and toxic gases, as well as their pairwise recognition on the basis of measuring the changes in tehnical parameters of porous silicon (PS), particularly investigating the concentration dependences of resistance, capacitance and frequency dependence of impedance of PS sensors. For gas indentification, processing of the sensor’s data by means of microcomputer systems is proposed. The work investigates the processes of detection of such toxic gases as pelargonic morpholide acid (PMA) and ammonia, as well as flammable explosive gases propane and volatile organic compounds of tobacco smoke. With this aim it is carried out measurements of volt-ampere characteristics (VAC), resistance and frequency dependence of impedance of heterostructure (HS) in the conditions of direct contact with gases at changing their concentration in volume. For identification of two toxic gases PMA and ammonia VAC are measured and concentration dependences of capacity and resistance of HS based on PS are determined. At adsorption of PMA and increase of its concentration the capacity and resistance of n-type PS decrease. When PS is located in the region of action of ammonia the capacity and resistance increase, i.e. the regime of extraction of electrons is realized. Thus, different character dependences of resistance and capacity allows to identify these gases. For another pair of gases – volatile organic compounds of tobacco smoke and flammable explosive gas propane it is observed the same influence of polar molecules of the gas on the subsystem of charge carriers of PS (resistance and capacity increase), however identification of gases in this case is carried out by means of analysis of changing the shape of frequency dependence of the difference value of impedance of PS samples that adsorb these gases.
Authors and Affiliations
L. S. Monastyrskii, O. I. Petryshyn, B. P. Koman, R. J. Yaremyk
Keywords
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- EP ID EP397121
- DOI 10.18524/1815-7459.2016.3.78646
- Views 95
- Downloads 0
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