title: Non-contact detection of breathing using a microwave sensor.
abstract: In this paper the use of a continuous-wave microwave sensor as a non-contact tool for quantitative measurement of respiratory tidal volume has been evaluated by experimentation in seventeen healthy volunteers. The sensor working principle is reported and several causes that can affect its response are analyzed. A suitable data processing has been devised able to reject the majority of breath measurements taken under non suitable conditions. Furthermore, a relationship between microwave sensor measurements and volume inspired and expired at quiet breathing (tidal volume) has been found.
authors.affiliation: Department of Electronics and Telecommunications, University of Florence, Via Santa Marta 3, 50139 Firenze, Italy; E-Mails:  gilberto.grazzini@unifi.it  (G.G.);  guido.luzi@unifi.it  (G.L.);  massimiliano.pieraccini@unifi.it  (M.P.);  carlo.atzeni@unifi.it  (C.A.).
authors.forename: Devis
authors.initials: D
authors.lastname: Dei
authors.forename: Gilberto
authors.initials: G
authors.lastname: Grazzini
authors.forename: Guido
authors.initials: G
authors.lastname: Luzi
authors.forename: Massimiliano
authors.initials: M
authors.lastname: Pieraccini
authors.forename: Carlo
authors.initials: C
authors.lastname: Atzeni
authors.forename: Sergio
authors.initials: S
authors.lastname: Boncinelli
authors.forename: Gianna
authors.initials: G
authors.lastname: Camiciottoli
authors.forename: Walter
authors.initials: W
authors.lastname: Castellani
authors.forename: Massimo
authors.initials: M
authors.lastname: Marsili
authors.forename: Juri Lo
authors.initials: JL
authors.lastname: Dico