NDLI: Eddy Current Based Flexible Sensor for Contactless Measurement of Breathing

Content Provider	IEEE Xplore Digital Library
Author	Richer, A. Adler, A.
Copyright Year	2004
Description	Author affiliation: Sch. of Inf. Technol. & Eng., Ottawa Univ., Ont. (Richer, A.; Adler, A.)
Abstract	Changes in the lung air volume change the conductivity distribution in the thorax. Based on this effect, we describe a non-contact instrument to measure lung volume which is suitable for applications such as monitoring of breathing in sleeping subjects for sleep apnea. The instrument is based on a magnetic coil and is positioned in a flexible mattress underneath the subject. AM frequency current is applied to the coil to generate eddy currents in nearby conductive tissues, which in turn generate a magnetic field opposed to the transmitted field. This effect makes changes in the thoracic conductivity distribution due to breathing and blood flow change the effective inductance of the coil. We describe a new design to measure this effect using a single transmit and receive coil. The coil forms part of a Colpitts oscillator tuned to be at its stability margin, in order to give large frequency changes for given changes in conductivity. The oscillator output is then demodulated using a frequency counter. This device was tested in healthy volunteers and showed a good correlation with pneumotachograph measurements
Starting Page	257
Ending Page	260
File Size	296246
Page Count	4
File Format	PDF
ISBN	0780388798
DOI	10.1109/IMTC.2005.1604112
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-05-16
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Eddy currents Current measurement Coils Conductivity Frequency Lungs Instruments Magnetic field measurement Oscillators Thorax tissue conductivity Biomedical Instrumentation Eddy current monitoring
Content Type	Text
Resource Type	Article

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