A Noise Spectroscopy-Based Selective Gas Sensing with MOX Gas Sensors

被引：8

作者：

Gomri, S. ^{[1
]}

Seguin, J. ^{[2
]}

Contaret, T. ^{[2
]}

Fiorido, T. ^{[2
]}

Aguir, K. ^{[2
]}

机构：

[1] Natl Sch Engineers Sfax, Rd Soukra,Km 4-3000, Sfax, Tunisia

[2] Aix Marseille Univ, Univ Toulon, CNRS, IM2NP, Marseille, France

来源：

FLUCTUATION AND NOISE LETTERS | 2018年 / 17卷 / 02期

关键词：

Metal oxide gas micro sensor; adsorption-desorption noise; fluctuation-enhanced sensing; noise spectroscopy; gas sensor selectivity; ADSORPTION-DESORPTION NOISE; CHEMICAL SENSORS; FILM; SPECTRA;

D O I：

10.1142/S0219477518500165

中图分类号：

O1 [数学];

学科分类号：

0701 ; 070101 ;

摘要：

We propose a new method for obtaining a fluctuation-enhanced sensing (FES) signature of a gas using a single metal oxide (MOX) gas micro sensor. Starting from our model of adsorption-desorption (A-D) noise previously developed, we show theoretically that the product of frequency by the power spectrum density (PSD) of the gas sensing layer resistance fluctuations often has a maximum which is characteristic of the gas. This property was experimentally confirmed in the case of the detection of NO2 and O-3 using a WO3 sensing layer. This method could be useful for classifying gases. Furthermore, our noise measurements confirm our previous model showing that PSD of the A-Dnoise in MOX gas sensor is a combination of Lorentzians having a low frequency magnitude and a cut-off frequency which depends on the nature of the detected gas.

引用

页数：22

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