Application of long-period-grating sensors to respiratory plethysmography

Thomas D. P. Allsop; Karen Carroll; G. Lloyd; David J. Webb; M. Miller; Ian Bennion

doi:10.1117/1.2821198

1 November 2007 Application of long-period-grating sensors to respiratory plethysmography

Thomas D. P. Allsop, Karen Carroll, G. Lloyd, David J. Webb, M. Miller, Ian Bennion

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Journal of Biomedical Optics, Vol. 12, Issue 6, 064003 (November 2007). https://doi.org/10.1117/1.2821198

Abstract

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, dλ/dR from ~7-nm m to ~9-nm m. 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 (SPIE)

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Thomas D. P. Allsop, Karen Carroll, G. Lloyd, David J. Webb, M. Miller, and Ian Bennion "Application of long-period-grating sensors to respiratory plethysmography," Journal of Biomedical Optics 12(6), 064003 (1 November 2007). https://doi.org/10.1117/1.2821198

Published: 1 November 2007

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KEYWORDS

Sensors

Signal attenuation

Spectroscopy

Chest

Mouth

Refractive index

Calibration

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