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Opt Lett. 2014 Sep 15;39(18):5463-6. doi: 10.1364/OL.39.005463.

High-sensitivity strain sensor based on inflated long period fiber grating.

Abstract

We demonstrated a high-sensitivity strain sensor based on an inflated long period fiber grating (I-LPFG). The I-LPFG was inscribed, for the first time to the best of our knowledge, by use of the pressure-assisted CO(2) laser beam scanning technique to inflate periodically air holes of a photonic crystal fiber. Such periodic inflations enhanced the sensitivity of the LPFG-based strain sensor to -5.62 pm/με. After high temperature annealing, the I-LPFG achieved a good repeatability and stability of temperature response with a sensitivity of 11.92 pm/°C.

PMID:
26466298
DOI:
10.1364/OL.39.005463

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