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High-sensitivity strain sensor based on in-fiber improved Fabry–Perot interferometer

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Abstract

We demonstrated a high-sensitivity strain sensor based on an in-fiber Fabry–Perot interferometer (FPI) with an air cavity, which was created by splicing together two sections of standard single-mode fibers. The sensitivity of this strain sensor was enhanced to 6.0pm/με by improving the cavity length of the FPI by means of repeating arc discharges for reshaping the air cavity. Moreover, such a strain sensor has a very low temperature sensitivity of 1.1pm/°C, which reduces the cross sensitivity between tensile strain and temperature.

© 2014 Optical Society of America

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