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Sensors 2014, 14(6), 10514-10526; doi:10.3390/s140610514

Improving Short Term Instability for Quantitative Analyses with Portable Electronic Noses

1,* , 1
1 University Center of Merida, University of Extremadura, Sta. Teresa de Jornet, 38, Mérida 06800, Spain 2 Polytechnic School, University of Extremadura, Cáceres 10003, Spain 3 Faculty of Science, University of Extremadura, Avda, Elvas s/n, Badajoz 06006, Spain
* Author to whom correspondence should be addressed.
Received: 13 February 2014 / Revised: 22 May 2014 / Accepted: 6 June 2014 / Published: 13 June 2014
(This article belongs to the Section Physical Sensors)
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One of the main problems when working with electronic noses is the lack of reproducibility or repeatability of the sensor response, so that, if this problem is not properly considered, electronic noses can be useless, especially for quantitative analyses. On the other hand, irreproducibility is increased with portable and low cost electronic noses where laboratory equipment like gas zero generators cannot be used. In this work, we study the reproducibility of two portable electronic noses, the PEN3 (commercial) and CAPINose (a proprietary design) by using synthetic wine samples. We show that in both cases short term instability associated to the sensors’ response to the same sample and under the same conditions represents a major problem and we propose an internal normalization technique that, in both cases, reduces the variability of the sensors’ response. Finally, we show that the normalization proposed seems to be more effective in the CAPINose case, reducing, for example, the variability associated to the TGS2602 sensor from 12.19% to 2.2%.
Keywords: electronic nose; quantitative analysis; gas sensor electronic nose; quantitative analysis; gas sensor
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Macías, M.M.; Agudo, J.E.; Manso, A.G.; Orellana, C.J.G.; Velasco, H.M.G.; Caballero, R.G. Improving Short Term Instability for Quantitative Analyses with Portable Electronic Noses. Sensors 2014, 14, 10514-10526.

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