Abstract
This study introduces a new type of salinity sensor based on fiber optic Fabry-Pérot (FOFPS) featuring a tip coated with intelligent chemical cross-linked network materials. The sensor integrates a single-mode optical fiber, capillary tube, and quartz rod, bonding both ends using UV glue. Furthermore, it employs a multi-layer coating of polyacrylic acid (PAA)-polyacrylamide (PAAm) hydrogel achieved through layer-by-layer stacking technology. Results indicate the FOFPS's capability to measure salinity in aqueous. Across concentrations ranging from 0 ‰ to 45 ‰, a linear correlation between wavelength and concentration is observed. FOFPS utilizing PAA-PAAm hydrogel exhibits a sensitivity of approximately 1.241 nm/‰, high linearity of 0.995, and maximum drift of 57.971 nm. These findings underscore the efficacy of PAA-PAAm hydrogel as a sensing layer in FOFPS, highlighting its superior adjustability, responsiveness, linearity, and suitability for environmental refractive index sensing applications.
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