Open AccessTwo semicircular-hole fiber in a Sagnac loop for simultaneous discrimination of torsion, strain and temperature
Author(s) -
Lin Htein,
Dinusha Serandi Gunawardena,
Zhengyong Liu,
Hwa Yaw Tam
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.402925
Subject(s) - optics , twist , birefringence , torsion (gastropod) , interferometry , materials science , core (optical fiber) , physics , wavelength , fiber optic sensor , optical fiber , polarization maintaining optical fiber , geometry , medicine , mathematics , surgery
We report a highly sensitive twist sensor based on a Sagnac interferometer constructed with a new type of optical fiber which contains an elliptical core and two large semicircular-holes, where the slow axis of the core orthogonal to the air-holes has a large sensitivity towards twist-induced birefringent changes. The novel fiber structure results in a highest twist sensitivity of 5.01 nm/° at a chosen dip over the range from 370°-400°. The resonance dips in the interference pattern respond with different rates in the wavelength shifts in the presence of physical parameters permitting to experimentally distinguish directional torsion, axial strain and temperature.