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Proceedings Paper

Polymeric fibre optic sensor based on a SiO2 nanoparticle film for humidity sensing on wounds
Author(s): David Gomez; Stephen P. Morgan; Barrie R. Hayes Gill; Serhiy Korposh
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Paper Abstract

Optical fibre sensors have the potential to be incorporated into wound dressings to monitor moisture and predict healing without the need to remove the dressing. A low cost polymeric optical fibre humidity sensor based on evanescent wave absorption is demonstrated for skin humidity measurement. The sensor is fabricated by coating the fibre with a hydrophilic film based on bilayers of Poly(allylamine hydrochloride) (PAH) and SiO2 mesoporous nanoparticles. The Layer-by-Layer method was used for the deposition of the layers. Multimode polymeric optical fibre with a cladding diameter of 250μm was covered by 7 layers of PAH/SiO2 film on the central region of an unclad fibre with a diameter of 190μm. The length of the sensitive region is 30mm. Experiment results show a decrease in light intensity when relative humidity increases due to refractive index changes of the fibre coating. The sensitivity obtained was 200mV/%RH and the sensor was demonstrated to provide a faster response to changes in the humidity of the skin microenvironment than a commercial sensor.

Paper Details

Date Published: 30 May 2016
PDF: 4 pages
Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 991623 (30 May 2016); doi: 10.1117/12.2236845
Show Author Affiliations
David Gomez, The Univ. of Nottingham (United Kingdom)
Stephen P. Morgan, The Univ. of Nottingham (United Kingdom)
Barrie R. Hayes Gill, The Univ. of Nottingham (United Kingdom)
Serhiy 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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