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IMTC 2005 Instrumentation and Measurement Technology Conference

Summary: IMTC 2005 Instrumentation and Measurement
Technology Conference
Ottawa, Canada, 17-19 May 2005
Eddy Current Based Flexible Sensor for Contactless Measurement of Breathing
Alex Richer, Andy Adler
School of Information Technology and Engineering,
University of Ottawa, Ontario, Canada
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 is
positionned in a flexible mattress underneath the subject. AM
frequency current is applied to the coil to generates 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


Source: Adler, Andy - Department of Systems and Computer Engineering, Carleton University


Collections: Computer Technologies and Information Sciences