Topics on “Libra” electronic nose for fruit quality

Correa Hernando, Eva Cristina (2001). Topics on “Libra” electronic nose for fruit quality. En: "EURODEUR-AIRDEUR Symposium", 19/06/2001 - 21/06/2001, París, Francia.

Descripción

Título: Topics on “Libra” electronic nose for fruit quality
Autor/es:
  • Correa Hernando, Eva Cristina
Tipo de Documento: Ponencia en Congreso o Jornada (Artículo)
Título del Evento: EURODEUR-AIRDEUR Symposium
Fechas del Evento: 19/06/2001 - 21/06/2001
Lugar del Evento: París, Francia
Título del Libro: Proceedings of EURODEUR-AIRDEUR Symposium
Fecha: 2001
Materias:
Escuela: E.T.S.I. Agrónomos (UPM) [antigua denominación]
Departamento: Ingeniería Rural [hasta 2014]
Grupo Investigación UPM: LPF-TAGRALIA
Licencias Creative Commons: Reconocimiento - No comercial - Compartir igual

Texto completo

[img]
Vista Previa
PDF (Document Portable Format) - Se necesita un visor de ficheros PDF, como GSview, Xpdf o Adobe Acrobat Reader
Descargar (380kB) | Vista Previa

Resumen

Quartz crystal microbalances (QCM) are piezoelectric devices. To turn a quartz crystal into a chemical sensor it is necessary to coat it with a layer of a material capable of capturing molecules from the environment. When a mass is absorbed or placed onto the quartz crystal surface, the oscillation frequency changes decreasing in proportion to the amount of mass (Di Natale et al. 1997). The ability to control a QCM´s selectivity by applying different coatings is an important feature, and makes this sensor type extremely versatile. However, the coating of QCM is, ironically, their greatest drawback. Batch-to-batch variability in the manufacturing leads to inadequate reproducibility(Sarig 2000). Indeed, the response of sensors depends on numerous factors that may be difficult to control, such as the temperature and the humidity of the carrier gas. All these factors cause changes in the selectivity of sensors affecting the reproducibility of measurements. The detection threshold of the human nose is typically between 1000 ppm (10-6)and <1ppt (10-12). Therefore, the absolute detection threshold of a gas sensor should be very low. For a QCM e-nose, only a few molecules are required to react with the sensitive elements leading to sensitivities close to the ppm or tenth of a ppm range as measured in the vapour phase (Mielle 1996) . Despite previous studies using electronic nose, no QCM calibration statement has been established in relation to the sensitivity needed in the sensors for organoleptic quality measurement in pear or in other fruit. Present work will show the possibilities of using this equipment as a non destructive method to evaluate fruit quality. The work will be developed in different steps or topics to get a better understanding.

Más información

ID de Registro: 9956
Identificador DC: http://oa.upm.es/9956/
Identificador OAI: oai:oa.upm.es:9956
Depositado por: Titular Universidad Eva Cristina Correa Hernando
Depositado el: 04 Ene 2012 09:57
Ultima Modificación: 20 Abr 2016 18:15
  • Open Access
  • Open Access
  • Sherpa-Romeo
    Compruebe si la revista anglosajona en la que ha publicado un artículo permite también su publicación en abierto.
  • Dulcinea
    Compruebe si la revista española en la que ha publicado un artículo permite también su publicación en abierto.
  • Recolecta
  • e-ciencia
  • Observatorio I+D+i UPM
  • OpenCourseWare UPM