Highly sensitive strain sensor based on a hollow-core fibre embedded SMS fibre structure

Ke Tian; Meng Zhang; Xin Wang; Gerald Farell; Pengfei Wang; Elfed Lewis

doi:10.1117/12.2541279

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28 August 2019 Highly sensitive strain sensor based on a hollow-core fibre embedded SMS fibre structure

Ke Tian, Meng Zhang, Xin Wang, Gerald Farell, Pengfei Wang, Elfed Lewis

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Proceedings Volume 11199, Seventh European Workshop on Optical Fibre Sensors; 111993C (2019) https://doi.org/10.1117/12.2541279
Event: Seventh European Workshop on Optical Fibre Sensors, 2019, Limassol, Cyprus

Abstract

A high sensitivity optical fibre strain sensor based on a hollow-core fibre embedded single-mode-multimode-singlemode (HESMS) fibre structure is described. The HESMS fibre structure is fabricated by connecting a length of hollowcore fibre (HCF) between two sections of multimode fibre (MMF). The embedded HCF acts as a Fabry-Perot cavity, and therefore a composite interference pattern based on the inherent multimode interference (MMI) and the introduced Fabry-Perot interferometer (FPI) is established. This resultant composite interference greatly improves the performance of the SMS fibre structure for strain sensing. A maximum strain sensitivity of -2.71 pm/με over the strain range of 700-1200 με is achieved experimentally. Benefiting from the simple fabrication process, this low-cost, high sensitivity strain sensor can be realistically applied in many areas where high-accuracy strain measurement is required.

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Ke Tian, Meng Zhang, Xin Wang, Gerald Farell, Pengfei Wang, and Elfed Lewis "Highly sensitive strain sensor based on a hollow-core fibre embedded SMS fibre structure", Proc. SPIE 11199, Seventh European Workshop on Optical Fibre Sensors, 111993C (28 August 2019); https://doi.org/10.1117/12.2541279

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