1/f and 1/f2 noise spectral densities in sensors made by polymers and SnO2

U. Weimar, M. Schweizer-Berberich, N. Barsan, A. Krauss, W. Gopel, J. Gardner, P. Bartlett, G. Sberveglieri, G. Faglia, A. Dell'Era, G. Filosofi, C. Di Natale, Alessandro Mantini, C. Falconi, A. D'Amico

Risultato della ricerca: Contributo in libroContributo a convegno


Noise measurements of conductive sensors made by either polymers and SnO2 materials, have been done at 25°C and around 300 °C respectively, in order to study their ultimate performances in terms of signal to noise ratio and the excess noise implications in multisensor artificial olfaction systems. In all the studied cases, of which only a few are here reported, excess noise spectral densities proportional to l/f were observed in the frequency range of about 1-10 kHz, even in presence of different kinds of adsorption processes. This suggests that the evaluation of the resolution values must be determined after noise characterizations have been done, especially for slow responding sensors. In fact if the time constants fall in the low frequency region where the amplitude of the noise spectral density may not be neglected. Furthermore, in presence of gas flow even l/f2 noise spectral density type (with n between 1 and 4) can be observed in Sn02, while the same kind of noise is also evident in polymer based sensors operating at room temperature at constant volatile compounds gas pressure conditions.
Lingua originaleEnglish
Titolo della pubblicazione ospiteProceedings of the 6th International Symposium Olfaction & Electronic Nose
Numero di pagine4
Stato di pubblicazionePubblicato - 1999
Pubblicato esternamente
EventoOlfaction & Electronic Nose - Tubingen
Durata: 20 set 199922 set 1999


ConvegnoOlfaction & Electronic Nose


  • Sensors
  • noise


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