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Research Papers

Application of long-period-grating sensors to respiratory plethysmography

[+] Author Affiliations
Thomas Allsop, Karen Carroll, Glynn Lloyd, David J. Webb

Aston University, Photonics Research Group, Aston Triangle, Birmingham B4 7ET, United Kingdom

Martin Miller

University Hospital Birmingham NHS Trust, Department of Medicine, Birmingham B29 6JD, United Kingdom

Ian Bennion

Photonics Research Group, Aston Triangle, Birmingham B4 7ET, United Kingdom

J. Biomed. Opt. 12(6), 064003 (December 19, 2007). doi:10.1117/1.2821198
History: Received December 22, 2006; Revised July 24, 2007; Accepted July 31, 2007; Published December 19, 2007
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A series of in-line curvature sensors on a garment are used to monitor the thoracic and abdominal movements of a human during respiration. These results are used to obtain volumetric tidal changes of the human torso in agreement with a spirometer used simultaneously at the mouth. The curvature sensors are based on long-period gratings (LPGs) written in a progressive three-layered fiber to render the LPGs insensitive to the refractive index external to the fiber. A curvature sensor consists of the fiber long-period grating laid on a carbon fiber ribbon, which is then encapsulated in a low-temperature curing silicone rubber. The sensors have a spectral sensitivity to curvature, dλdR from 7-nmm to 9-nmm. The interrogation technique is borrowed from derivative spectroscopy and monitors the changes in the transmission spectral profile of the LPG’s attenuation band due to curvature. The multiplexing of the sensors is achieved by spectrally matching a series of distributed feedback (DFB) lasers to the LPGs. The versatility of this sensing garment is confirmed by it being used on six other human subjects covering a wide range of body mass indices. Just six fully functional sensors are required to obtain a volumetric error of around 6%.

© 2007 Society of Photo-Optical Instrumentation Engineers

Topics

Sensors

Citation

Thomas Allsop ; Karen Carroll ; Glynn Lloyd ; David J. Webb ; Martin Miller, et al.
"Application of long-period-grating sensors to respiratory plethysmography", J. Biomed. Opt. 12(6), 064003 (December 19, 2007). ; http://dx.doi.org/10.1117/1.2821198


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