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Highly sensitive strain sensor based on a hollow-core fibre embedded SMS fibre structure
Author(s): Ke Tian; Meng Zhang; Xin Wang; Gerald Farell; Pengfei Wang; Elfed Lewis
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Paper 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.

Paper Details

Date Published: 28 August 2019
PDF: 4 pages
Proc. SPIE 11199, Seventh European Workshop on Optical Fibre Sensors, 111993C (28 August 2019); doi: 10.1117/12.2541279
Show Author Affiliations
Ke Tian, Harbin Engineering Univ. (China)
Meng Zhang, Harbin Engineering Univ. (China)
Xin Wang, Harbin Engineering Univ. (China)
Gerald Farell, Dublin Institute of Technology (Ireland)
Pengfei Wang, Harbin Engineering Univ. (China)
Shenzhen Univ. (China)
Elfed Lewis, Univ. of Limerick (Ireland)


Published in SPIE Proceedings Vol. 11199:
Seventh European Workshop on Optical Fibre Sensors
Kyriacos Kalli; Sinead O. O'Keeffe; Gilberto Brambilla, Editor(s)

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