Simultaneous temperature and humidity measurements in a mechanical ventilator using an optical fibre sensor

F. U. Hernandez; R. Correia; S. P. Morgan; B. Hayes-Gill; D. Evans; R. Sinha; A. Norris; D. Harvey; J. G. Hardman; S. Korposh

doi:10.1117/12.2236850

30 May 2016 Simultaneous temperature and humidity measurements in a mechanical ventilator using an optical fibre sensor

F. U. Hernandez, R. Correia, S. P. Morgan, B. Hayes-Gill, D. Evans, R. Sinha, A. Norris, D. Harvey, J. G. Hardman, S. Korposh

Author Affiliations +

Proceedings Volume 9916, Sixth European Workshop on Optical Fibre Sensors; 99160C (2016) https://doi.org/10.1117/12.2236850
Event: Sixth European Workshop on Optical Fibre Sensors (EWOFS'2016), 2016, Limerick, Ireland

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.

Citation Download Citation

F. U. Hernandez, R. Correia, S. P. Morgan, B. Hayes-Gill, D. Evans, R. Sinha, A. Norris, D. Harvey, J. G. Hardman, and S. Korposh "Simultaneous temperature and humidity measurements in a mechanical ventilator using an optical fibre sensor", Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 99160C (30 May 2016); https://doi.org/10.1117/12.2236850

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