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Miniature fiber-optic high temperature sensor based on a hybrid structured Fabry–Perot interferometer

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Abstract

A miniature Fabry–Perot (FP) interferometric fiber-optic sensor suitable for high-temperature sensing is proposed and demonstrated. The sensor head consists of two FP cavities formed by fusion splicing a short hollow-core fiber and a piece of single-mode fiber at a photonic crystal fiber in series. The reflection spectra of an implemented sensor are measured at several temperatures and analyzed in the spatial frequency domain. The experiment shows that the thermal-optic effect of the cavity material is much more appreciable than its thermal expansion. The temperature measurements up to 1000°C with a step of 50°C confirm that it could be applicable as a high-temperature sensor.

© 2008 Optical Society of America

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