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In-fiber torsion sensor based on dual polarized Mach-Zehnder interference.

Authors
  • Chen, Lei
  • Zhang, Wei-Gang
  • Wang, Li
  • Zhang, Hao
  • Sieg, Jonathan
  • Zhou, Quan
  • Zhang, Li-Yu
  • Wang, Biao
  • Yan, Tie-Yi
Type
Published Article
Journal
Optics Express
Publisher
The Optical Society
Publication Date
Dec 29, 2014
Volume
22
Issue
26
Pages
31654–31664
Identifiers
DOI: 10.1364/OE.22.031654
PMID: 25607136
Source
Medline
License
Unknown

Abstract

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.

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