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All fiber optic modular sensing system for hydrostatic pressure measurements with a photonic liquid crystal fiber analyzer

The paper presents a modular fiber optic hydrostatic pressure sensing system based on a polarimetric highly birefringent photonic crystal fiber (HB PCF) operating at infrared wavelengths and utilizing a replaceable fiber-optic head, which allows simple fitting to the measured range of hydrostatic pressure. We propose also an all-fiber built-in analyzer that is based on polarization properties of the photonic crystal fiber filled with a liquid crystal. The output characteristics of the modular sensing system have been optimized in view of enhancing their measurement capabilities and in order to minimize disturbing environmental effects.