Polymeric fibre optic sensor based on a SiO2 nanoparticle film for humidity sensing on wounds

Gomez, David; Morgan, Stephen P.; Hayes Gill, Barrie R.; Korposh, Serhiy

Abstract

© 2016 SPIE. 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.

Citation

Gomez, D., Morgan, S. P., Hayes Gill, B. R., & Korposh, S. Polymeric fibre optic sensor based on a SiO2 nanoparticle film for humidity sensing on wounds. Presented at Sixth European Workshop on Optical Fibre Sensors (EWOFS'2016), Limerick, Ireland

• Presentation Conference Type: Conference Paper (published)
• Conference Name: Sixth European Workshop on Optical Fibre Sensors (EWOFS'2016)
• Publication Date: May 30, 2016
• Deposit Date: Apr 12, 2024
• Journal: Proceedings of SPIE - The International Society for Optical Engineering
• Print ISSN: 0277-786X
• Electronic ISSN: 1996-756X
• Publisher: Society of Photo-optical Instrumentation Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 9916
• Article Number: 991623
• DOI: https://doi.org/10.1117/12.2236845
• Public URL: https://nottingham-repository.worktribe.com/output/3210253
• Publisher URL: https://www.spiedigitallibrary.org/conference-proceedings-of-spie/9916/1/Polymeric-fibre-optic-sensor-based-on-a-SiO2-nanoparticle-film/10.1117/12.2236845.short