Kavli Affiliate: Jia Liu
| First 5 Authors: Jia Liu, Jia Liu, , ,
| Summary:
Real-time and accurate monitoring of humidity and pH is of great significance
in daily life and industrial production. Existing humidity and pH measurement
suffer from limitations such as low sensitivity, signal crosstalk, complex
system structures, and inability to achieve real-time monitoring. In this work,
the surface of a polarization maintaining fiber (PMF) was functionalized with a
composite humidity-sensitive polymer composed of polyvinyl alcohol (PVA) and
carbon nanosheets (CNs). A humidity-sensitive film with a microporous structure
was prepared on the PMF cladding through high-temperature rapid film formation
and laser processing, enhancing humidity sensitivity and stability. To enable
pH sensing, poly(allylamine hydrochloride) (PAH) and poly (acrylic acid) (PAA)
were successively adsorbed onto the PMF surface via electrostatic
self-assembly, forming a pH-sensitive nanofilm structure. By connecting a
temperature-compensated PMF within the same Sagnac loop and combining it with a
multi-wavelength matrix, simultaneous real-time monitoring of humidity, pH, and
temperature was achieved, effectively solving the issue of temperature
crosstalk and extending toward a universal optical fiber multi-parameter
measurement platform.
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