{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,2]],"date-time":"2026-07-02T06:38:41Z","timestamp":1782974321026,"version":"3.54.5"},"reference-count":30,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2014,6,13]],"date-time":"2014-06-13T00:00:00Z","timestamp":1402617600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>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\u2019 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\u2019 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%.<\/jats:p>","DOI":"10.3390\/s140610514","type":"journal-article","created":{"date-parts":[[2014,6,13]],"date-time":"2014-06-13T11:12:51Z","timestamp":1402657971000},"page":"10514-10526","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Improving Short Term Instability for Quantitative Analyses with Portable Electronic Noses"],"prefix":"10.3390","volume":"14","author":[{"given":"Miguel","family":"Mac\u00edas","sequence":"first","affiliation":[{"name":"University Center of Merida, University of Extremadura, Sta. Teresa de Jornet, 38, M\u00e9rida 06800, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J.","family":"Agudo","sequence":"additional","affiliation":[{"name":"University Center of Merida, University of Extremadura, Sta. Teresa de Jornet, 38, M\u00e9rida 06800, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Antonio","family":"Manso","sequence":"additional","affiliation":[{"name":"Polytechnic School, University of Extremadura, C\u00e1ceres 10003, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carlos","family":"Orellana","sequence":"additional","affiliation":[{"name":"Faculty of Science, University of Extremadura, Avda, Elvas s\/n, Badajoz 06006, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Horacio","family":"Velasco","sequence":"additional","affiliation":[{"name":"Polytechnic School, University of Extremadura, C\u00e1ceres 10003, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ram\u00f3n","family":"Caballero","sequence":"additional","affiliation":[{"name":"Polytechnic School, University of Extremadura, C\u00e1ceres 10003, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2014,6,13]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"7122","DOI":"10.3390\/s100807122","article-title":"Automated Signal Processing Applied to Volatile-Based Inspection of Greenhouse Crops","volume":"10","author":"Jansen","year":"2010","journal-title":"Sensors"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"39","DOI":"10.1016\/j.snb.2004.02.024","article-title":"An Electronic Nose Based on Solid State Sensor Arrays for Low-Cost Indoor Air Quality Monitoring Applications","volume":"101","author":"Zampolli","year":"2004","journal-title":"Sens. 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