On-line Magazine 'Sensors & Transducers' (S&T e-Digest)
(ISSN 1726- 5479)
Vol. 38, Issue 12, December 2003, pp. 59-66
Fluctuation-Enhanced Sensing with Commercial Gas Sensors
Jose L. SOLIS, Gary SEETON, Yingfeng LI, and Laszlo B. KISH
Department of Electrical Engineering, Texas A&M University,
College Station, TX 77843-3128, USA
Phone: (979) 847-9071, fax: (979) 845-6259, e-mail: Laszlo.Kish@ee.tamu.edu
Received: 16 November 2003 /Accepted: 12 December 2003 /Published: 18 December 2003
Abstract: The stochastic component of the sensor signal in commercial semiconductor gas sensors during exposure to different gases has been studied. The resistance fluctuation measurements have been carried out using different concentrations of ethanol, CO, NOx, H2 and SO2 in dry synthetic air. The analysis of the stochastic resistance fluctuations in gas sensors during exposure to gases enables an enhanced sensitivity and selectivity. The normalized power spectrum is characteristic for each sensor, and each gas induces a new characteristic power spectrum. In many cases, sensors can be used even for different gases than the gas they were originally designed for.
Keywords: electronic nose, gas sensing, electronic tongue, stochastic sensing, 1/f noise
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