The application of a long period grating sensors to human respiratory plethysmography

Thomas D.P. Allsop*, Karen Carroll, David J. Webb, Ian Bennion

*Corresponding author for this work

Research output: Chapter in Book/Published conference outputConference publication


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%.

Original languageEnglish
Title of host publicationProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Publication statusPublished - 26 Nov 2007
EventNovel Optical Instrumentation for Biomedical Applications III - Munich, United Kingdom
Duration: 17 Jun 200719 Jun 2007


ConferenceNovel Optical Instrumentation for Biomedical Applications III
Country/TerritoryUnited Kingdom

Bibliographical note

Copyright 2007 SPIE. One print or electronic copy may be made for personal use only. Systematic reproduction, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.


  • Curvature sensing
  • Long period gratings
  • Respiratory monitoring


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