Respiratory function monitoring using a real-time three-dimensional fiber-optic shaping sensing scheme based upon fiber Bragg gratings

Thomas D.P. Allsop, Ranjeet Bhamber, Glynn D. Lloyd, Martin R. Miller, Andrew Dixon, David Webb, Juan D. Ania-Castañón, I. Bennion

Research output: Contribution to journalArticle


An array of in-line curvature sensors on a garment is used to monitor the thoracic and abdominal movements of a human during respiration. The results are used to obtain volumetric changes of the human torso in agreement with a spirometer used simultaneously at the mouth. The array of 40 in-line fiber Bragg gratings is used to produce 20 curvature sensors at different locations, each sensor consisting of two fiber Bragg gratings. The 20 curvature sensors and adjoining fiber are encapsulated into a low-temperature-cured synthetic silicone. The sensors are wavelength interrogated by a commercially available system from Moog Insensys, and the wavelength changes are calibrated to recover curvature. A three-dimensional algorithm is used to generate shape changes during respiration that allow the measurement of absolute volume changes at various sections of the torso. It is shown that the sensing scheme yields a volumetric error of 6%. Comparing the volume data obtained from the spirometer with the volume estimated with the synchronous data from the shape-sensing array yielded a correlation value 0.86 with a Pearson's correlation coefficient p <0.01.
Original languageEnglish
Article number117001
JournalJournal of Biomedical Optics
Issue number11
Publication statusPublished - Nov 2012


Bibliographical note

Allsop, Thomas; Bhamber, Ranjeet; Lloyd, Glynn D.; Miller, Martin R.; Dixon, Andrew; Webb, David; Ania-Castañón, Juan D.; Bennion, I. "Respiratory function monitoring using a real-time three-dimensional fiber-optic shaping sensing scheme based upon fiber Bragg gratings", Journal of biomedical optics, Vol. 17, No. 11, art. no. 117001 (2012).

Copyright 2012 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, 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
  • shape sensing; fiber Bragg gratings
  • respiratory monitoring

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