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Sensors 2009, 9(4), 2574-2585; doi:10.3390/s90402574
Article

Non-Contact Detection of Breathing Using a Microwave Sensor

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1 Department of Electronics and Telecommunications, University of Florence, Via Santa Marta 3, 50139 Firenze, Italy 2 Department of Medical and Surgical Critical Area, University of Florence, Viale Morgagni 85, 50134 Firenze, Italy 3 Unit of Respiratory Physiopathology, University of Florence, Viale Morgagni 85, 50134 Firenze, Italy
* Author to whom correspondence should be addressed.
Received: 13 March 2009 / Revised: 7 April 2009 / Accepted: 14 April 2009 / Published: 14 April 2009
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Italy)
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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.
Keywords: Microwave sensor; respiratory movement; vital signs; tidal volume Microwave sensor; respiratory movement; vital signs; tidal volume
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Dei, D.; Grazzini, G.; Luzi, G.; Pieraccini, M.; Atzeni, C.; Boncinelli, S.; Camiciottoli, G.; Castellani, W.; Marsili, M.; Lo Dico, J. Non-Contact Detection of Breathing Using a Microwave Sensor. Sensors 2009, 9, 2574-2585.

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