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.
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