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Refractive Index Insensitive Temperature Sensor Based on an Optical Fiber Interferometer

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Abstract

In this work we present an in-line fiber-optics sensor for temperature measurements. The sensing probe is a single-mode/single-mode (SM-SM) fiber configuration formed by splicing two sections of SM fibers with a lateral offset, the sensing probe is coated by the sputtering technique using gold. The measurement of the temperature is carried out by monitoring the shift of the interference pattern. This sensor configuration exhibits insensitivity to changes in the refractive index of the external medium, which broadens the range of environments in which the sensor can measure. The temperature sensitivity obtained for this configuration was 5380 nm/°C.

© 2016 Optical Society of America

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