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Proceedings Paper

The application of a long period grating sensors to human respiratory plethysmography
Author(s): T. Allsop; K. Carroll; D. J. Webb; I. Bennion; Martin Miller M.D.
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Paper Abstract

A series of nine in-line curvature sensors on a garment are used to monitor the thoracic and abdominal movements of a human during respiration for application to Human Respiratory Plethysmography. These results are used to obtain volumetric tidal changes of the human torso which show agreement with data from a spirometer used simultaneously to recorded the inspired and expired volume at the mouth during both rhythmic and transient breathing patterns. The curvature sensors are based upon long period gratings which are written in a progressive three layered fibre to render them insensitive to refractive index changes. The sensor consists of the long period grating laid upon a carbon fibre ribbon, with this then encapsulated in a low temperature curing silicone rubber. The sensing array is multiplexed and interrogated using a derivative spectroscopy based technique to monitor the response of the LPGs' attenuation bands to curvature. The versatility of this scheme is demonstrated by applying the same garment and sensors to various human body types and sizes. It was also found from statistical analysis of the sensing array data, in conjunction with the measurements taken with a spirometer, that 11 to 12 sensors should be required to obtain an absolute volumetric error of 5%.

Paper Details

Date Published: 16 July 2007
PDF: 9 pages
Proc. SPIE 6631, Novel Optical Instrumentation for Biomedical Applications III, 66311G (16 July 2007); doi: 10.1117/12.727821
Show Author Affiliations
T. Allsop, Aston Univ. (United Kingdom)
K. Carroll, Aston Univ. (United Kingdom)
D. J. Webb, Aston Univ. (United Kingdom)
I. Bennion, Aston Univ. (United Kingdom)
Martin Miller M.D., Univ. Hospital Birmingham NHS Trust, Univ. of Birmingham (United Kingdom)

Published in SPIE Proceedings Vol. 6631:
Novel Optical Instrumentation for Biomedical Applications III
Christian D. Depeursinge, Editor(s)

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