Optimized multi-frequency temperature modulation of micro-hotplate gas sensors

被引：3

作者：

Vergara, A ^{[1
]}

Llobet, E ^{[1
]}

Brezmes, J ^{[1
]}

Vilanova, X ^{[1
]}

Stankova, M ^{[1
]}

Gràcia, I ^{[1
]}

Cané, C ^{[1
]}

Correig, X ^{[1
]}

机构：

[1] Univ Rovira & Virgili, Dept Elect Engn, Tarragona, Spain

来源：

PROCEEDINGS OF THE IEEE SENSORS 2004, VOLS 1-3 | 2004年

关键词：

temperature modulation; multi-sinusoldal signals; multi-level pseudo-random sequence (PRS) and micro-hotplate gas sensor;

D O I：

10.1109/ICSENS.2004.1426444

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We demonstrate, for the first time, how it is possible to optimize a multi-frequency signal to be used in the modulation of the operating temperature of an integrated gas sensor microarray. In the first step, a multilevel pseudo-random sequence (MPRS), which allows for modulating the operating temperature of the sensors in a wide frequency range, is used to obtain an estimate of the impulse response of each microsensor-gas system. In the second step, by analyzing the spectral components of the impulse response estimates, the modulating frequencies that better help in discriminating the gases and gas mixtures considered are found. Finally, by selecting a subset of the best modulating frequencies (e.g. up to 5 frequencies), an optimized multi-frequency temperature modulating signal can be synthesized. The method is illustrated by analyzing different concentrations of NH(3), NO, and their mixtures using a microarray of WO(3)-based gas sensors.

引用

页码：1392 / 1395

页数：4

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