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Proceedings Paper

Simultaneous temperature and humidity measurements in a mechanical ventilator using an optical fibre sensor
Author(s): F. U. Hernandez; R. Correia; S. P. Morgan; B. Hayes-Gill; D. Evans; R. Sinha; A. Norris; D. Harvey; J. G. Hardman; S. Korposh
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Paper Abstract

An optical fibre sensor for simultaneous temperature and humidity measurements consisting of one fibre Bragg grating (FBG) to measure temperature and a mesoporous film of bilayers of Poly(allylamine hydrochloride)(PAH) and silica (SiO2) nanoparticles deposited onto the tip of the same fibre to measure humidity is reported. The hygroscopic film was created using the layer-by-layer (LbL) method and the optical reflection spectra were measured up to a maximum of 23 bilayers. The temperature sensitivity of the FBG was 10 pm/°C while the sensitivity to humidity was (-1.4x10-12 W / %RH) using 23 bilayers. The developed sensor was tested in the mechanical ventilator and temperature and humidity of the delivered artificial air was simultaneously measured. Once calibrated, the optical fibre sensor has the potential to control the absolute humidity as an essential part of critical respiratory care.

Paper Details

Date Published: 30 May 2016
PDF: 4 pages
Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 99160C (30 May 2016); doi: 10.1117/12.2236850
Show Author Affiliations
F. U. Hernandez, The Univ. of Nottingham (United Kingdom)
R. Correia, The Univ. of Nottingham (United Kingdom)
S. P. Morgan, The Univ. of Nottingham (United Kingdom)
B. Hayes-Gill, The Univ. of Nottingham (United Kingdom)
D. Evans, Queen's Medical Ctr. (United Kingdom)
R. Sinha, Queen's Medical Ctr. (United Kingdom)
A. Norris, Queen's Medical Ctr. (United Kingdom)
D. Harvey, Queen's Medical Ctr. (United Kingdom)
J. G. Hardman, Queen's Medical Ctr. (United Kingdom)
S. Korposh, The Univ. of Nottingham (United Kingdom)

Published in SPIE Proceedings Vol. 9916:
Sixth European Workshop on Optical Fibre Sensors
Elfed Lewis, Editor(s)

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