Abstract
A fiber-optic sensor for simultaneous measurement of temperature and pressure is proposed and experimentally demonstrated. The sensor is composed of a hollow core fiber (HCF) sandwiched by two segments of single mode fiber (SMF), in which Fabry-Perot interference (FPI) combined with antiresonant (AR) mechanism are applied to the simultaneous measurement of temperature and pressure. The reflection spectrum of the sensor is composed of a sinusoid caused by axial FPI and several resonant wavelengths induced by AR mechanism occurred in cladding of the HCF. Two kinds of mechanisms have different responses to temperature and pressure, so the proposed sensor can simultaneously measure the pressure and temperature without pressure-temperature cross-talk. The advantages of the proposed sensor including small size, compact structure, and easy fabrication.
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