Open AccessIn-fiber torsion sensor based on dual polarized Mach-Zehnder interference
Author(s) -
Lei Chen,
Weigang Zhang,
Li Wang,
Hao Zhang,
Jonathan Sieg,
Quan Zhou,
Li-Yu Zhang,
Biao Wang,
Tieyi Yan
Publication year - 2014
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.031654
Subject(s) - fiber optic sensor , demodulation , optics , torsion (gastropod) , optical fiber , mach–zehnder interferometer , single mode optical fiber , materials science , physics , interferometry , computer science , telecommunications , medicine , channel (broadcasting) , surgery
This paper presents a novel optical fiber torsion sensor based on dual polarized Mach-Zehnder interference (DPMZI). Unlike the conventional fiber sensor, the proposed sensor is composed of a sensor part and a demodulator. The demodulator is made by a bared single mode fiber (SMF) loop, and the sensor part is a segment of a coated SMF placed before the loop. A mathematical model is proposed based on DPMZI mechanism and from the model when the sensor part is twisted, the E-field rotational angle will bring a quasi-linear impact on the resonance dip wavelength in their matched detecting range. A proof-of-concept experiment was performed to verify the theoretical prediction. From the experimental data, a sensitivity of -0.3703, -1.00962, and -0.59881 nm•m/rad is achieved with the determining range of 12.0936, 7.6959, and 10.4444 rad/m respectively. The sensor which is composed only of the SMF has the advantages of low insertion loss (~-2dB), healthy structure, low manufacture cost, and easy assembly and application.